CEMENT KILN BURNER AND METHOD FOR OPERATING SAME

Abstract

A cement kiln burner includes a plurality of columnar or cylindrical flow channels. Outlets of the respective flow channels are disposed on substantially the same plane. A wind velocity adjusting member capable of changing a cross-sectional area at an outlet-side tip-end portion of the flow channel by moving along an axial direction of the flow channel in a state of being in contact with any one of an inner peripheral wall and an outer peripheral wall of the flow channel and not in contact with the other is provided inside at least one of the flow channels.

Claims

1. A cement kiln burner comprising a plurality of columnar or cylindrical flow channels, wherein outlets of the respective flow channels are disposed on substantially the same plane, and a wind velocity adjusting member capable of changing a cross-sectional area at an outlet-side tip-end portion of the flow channel by moving along an axial direction of the flow channel in a state of being in contact with one of an inner peripheral wall and an outer peripheral wall of the flow channel and not in contact with the other is provided inside at least one of the flow channels.

2. The cement kiln burner according to claim 1, wherein the flow channel provided with the wind velocity adjusting member forms straight air flows.

3. The cement kiln burner according to claim 1, wherein the flow channel provided with the wind velocity adjusting member forms swirl air flows having a swirl angle of 1 to 60 degrees.

4. The cement kiln burner according to claim 1, wherein each of the plurality of flow channels is provided with the wind velocity adjusting member.

5. The cement kiln burner according to claim 1, wherein the wind velocity adjusting member is provided inside a cylindrical flow channel positioned on an outermost side among the plurality of flow channels.

6. A method for operating a cement kiln burner according to claim 1, the method comprising: reducing a cross-sectional area at a tip-end portion of the flow channel by advancing the wind velocity adjusting member toward the outlet side when increasing the wind velocity of the fluid blown out from the flow channel provided with the wind velocity adjusting member; and increasing the cross-sectional area at the tip-end portion of the flow channel by retracting the wind velocity adjusting member from the outlet side when decreasing the wind velocity of the fluid blown out from the flow channel.

7. The cement kiln burner according to claim 2, wherein each of the plurality of flow channels is provided with the wind velocity adjusting member.

8. The cement kiln burner according to claim 3, wherein each of the plurality of flow channels is provided with the wind velocity adjusting member.

9. The cement kiln burner according to claim 2, wherein the wind velocity adjusting member is provided inside a cylindrical flow channel positioned on an outermost side among the plurality of flow channels.

10. The cement kiln burner according to claim 3, wherein the wind velocity adjusting member is provided inside a cylindrical flow channel positioned on an outermost side among the plurality of flow channels.

11. The cement kiln burner according to claim 4, wherein the wind velocity adjusting member is provided inside a cylindrical flow channel positioned on an outermost side among the plurality of flow channels.

12. A method for operating a cement kiln burner according to claim 2, the method comprising: reducing a cross-sectional area at a tip-end portion of the flow channel by advancing the wind velocity adjusting member toward the outlet side when increasing the wind velocity of the fluid blown out from the flow channel provided with the wind velocity adjusting member; and increasing the cross-sectional area at the tip-end portion of the flow channel by retracting the wind velocity adjusting member from the outlet side when decreasing the wind velocity of the fluid blown out from the flow channel.

13. A method for operating a cement kiln burner according to claim 3, the method comprising: reducing a cross-sectional area at a tip-end portion of the flow channel by advancing the wind velocity adjusting member toward the outlet side when increasing the wind velocity of the fluid blown out from the flow channel provided with the wind velocity adjusting member; and increasing the cross-sectional area at the tip-end portion of the flow channel by retracting the wind velocity adjusting member from the outlet side when decreasing the wind velocity of the fluid blown out from the flow channel.

14. A method for operating a cement kiln burner according to claim 4, the method comprising: reducing a cross-sectional area at a tip-end portion of the flow channel by advancing the wind velocity adjusting member toward the outlet side when increasing the wind velocity of the fluid blown out from the flow channel provided with the wind velocity adjusting member; and increasing the cross-sectional area at the tip-end portion of the flow channel by retracting the wind velocity adjusting member from the outlet side when decreasing the wind velocity of the fluid blown out from the flow channel.

15. A method for operating a cement kiln burner according to claim 5, the method comprising: reducing a cross-sectional area at a tip-end portion of the flow channel by advancing the wind velocity adjusting member toward the outlet side when increasing the wind velocity of the fluid blown out from the flow channel provided with the wind velocity adjusting member; and increasing the cross-sectional area at the tip-end portion of the flow channel by retracting the wind velocity adjusting member from the outlet side when decreasing the wind velocity of the fluid blown out from the flow channel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG. 1 is a view schematically illustrating a cement kiln burner according to a first embodiment, at its tip-end portion.

[0016] FIG. 2 is a view schematically illustrating an example of the structure of a cement kiln burner system including the cement kiln burner illustrated in FIG. 1.

[0017] FIG. 3 is a view schematically illustrating the movement of a wind velocity adjusting member and the influence of the wind velocity adjusting member on a wind velocity according to the first embodiment.

[0018] FIG. 4 is a view schematically illustrating the movement of a wind velocity adjusting member and the influence of the wind velocity adjusting member on a wind velocity according to a second embodiment.

[0019] FIG. 5 is a view schematically illustrating the movement of a wind velocity adjusting member and the influence of the wind velocity adjusting member on a wind velocity according to a third embodiment.

[0020] FIG. 6 is a transverse cross-sectional view of a cement kiln burner according to another embodiment.

[0021] FIG. 7 is a transverse cross-sectional view of a wind velocity adjusting member according to another embodiment.

[0022] FIG. 8 is a view schematically illustrating a cement kiln burner according to Example 1, at its tip-end portion.

[0023] FIG. 9 is an overall view of a calcining furnace including a cement kiln burner according to Example 2 and a transverse cross-sectional view of the cement kiln burner.

MODE FOR CARRYING OUT THE INVENTION

[0024] Hereinafter, there will be described embodiments of a cement kiln burner and a method for operating the same, according to the present invention, with reference to the drawings. Incidentally, the drawings which will be described later are schematically illustrated, and dimension ratios in the drawings are not coincident with the actual dimension ratios.

First Embodiment

[0025] FIG. 1 is a view schematically illustrating a cement kiln burner according to a first embodiment, at its tip-end portion. In FIG. 1, (a) is a transverse cross-sectional view of the cement kiln burner, and (b) is a longitudinal cross-sectional view of the same. Further, the transverse cross-sectional view refers to a cross-sectional view of the cement kiln burner taken along a plane orthogonal to the axial direction of the same. The longitudinal cross-sectional view refers to a cross-sectional view of the cement kiln burner taken along a plane parallel to the axial direction of the same.

[0026] Further, in FIG. 1, there is defined a coordinate system, by defining the axial direction of the cement kiln burner (namely, the direction of air flows) as a Y direction, by defining the vertical direction as a Z direction, and by defining the direction orthogonal to a YZ plane as an X direction. Hereinafter, descriptions will be given by appropriately referring to the XYZ coordinate system. By using this XYZ coordinate system, FIG. 1(a) corresponds to a cross-sectional view of the cement kiln burner, taken along an XZ plane, and FIG. 1(b) corresponds to a cross-sectional view of the cement kiln burner, taken along the YZ plane. More specifically. FIG. 1(b) corresponds to a cross-sectional view of the cement kiln burner, taken along the YZ plane, at a position near the burner tip.

[0027] As illustrated in FIG. 1, a cement kiln burner 1 includes plural flow channels in a concentric manner. More specifically, the cement kiln burner 1 includes a powdered-solid-fuel flow channel 2, a first air flow channel 11 disposed adjacent to and outside the powdered-solid-fuel flow channel 2, and a second air flow channel 12 disposed adjacent to and on the inside of the powdered-solid-fuel flow channel 2. Further, an oil flow channel 3, a combustible-solid-waste flow channel 4 and the like are disposed on the inside of the second air flow channel 12. Outlets of these flow channels are disposed on substantially the same plane.

[0028] In the powdered-solid-fuel flow channel 2 and the second air flow channel 12, out of the powdered-solid-fuel flow channel 2 and the first and second air flow channels 11 and 12, swirl vanes (2t, 12t) as respective swirl means are secured to the burner tip-end portions in the respective flow channels (see FIG. 1(b)). Namely, air flows ejected from the second air flow channel 12 form swirl air flows (which will be properly referred to as swirl inner flows, hereinafter) positioned on the inside of powdered-solid-fuel flow ejected from the powdered-solid-fuel flow channel 2. Further, the respective swirl vanes (2t, 12t) are adjustable in swirl angle, at the time point before the start of operation of the cement kiln burner 1. The swirl angle is set to 1 to 60 degrees, for example.

[0029] Meanwhile, no swirl means is provided in the first air flow channel 11. Namely, air flows ejected from the first air flow channel 11 form straight air flows (which will be properly referred to as straight outer flows, hereinafter) positioned outside powdered-solid-fuel flows ejected from the powdered-solid-fuel flow channel 2.

[0030] A wind velocity adjusting member 5 is provided inside the first air flow channel 11. By moving the wind velocity adjusting member 5 along the axial direction of the first air flow channel 11, the wind velocity can be adjusted without changing the airflow rate of the air blown out from the first air flow channel 11 (will be described in detail later).

[0031] FIG. 2 is a view schematically illustrating an example of the structure of a cement kiln burner system including the cement kiln burner 1 illustrated in FIG. 1. A cement kiln burner system 20 illustrated in FIG. 2 is structured in such a way as to place importance on facilitating the control, and this cement kiln burner system 20 includes four blowing fans F1 to F4 without limitation.

[0032] Pulverized coal C (one example of powdered solid fuel) supplied to a pulverized-coal transfer pipe 21 is supplied to the powdered-solid-fuel flow channel 2 in the cement kiln burner 1, through air flows formed by the blowing fan F1. Air supplied from the blowing fan F2 is supplied, as combustion air A, to the first air flow channel 11 in the cement kiln burner 1, through an air pipe 22. Air supplied from the blowing fan F3 is supplied, as combustion air A, to the second air flow channel 12 in the cement kiln burner 1, through an air pipe 23. A combustible solid waste RF supplied to a combustible-solid-waste transfer pipe 24 is supplied to the combustible-solid-waste flow channel 4 in the cement kiln burner 1, through air flows formed by the blowing fan F4.

[0033] The cement kiln burner system 20 illustrated in FIG. 2 is capable of controlling the amount of air flowing through each of the flow channels (2, 4, 11, 12), independently, through the blowing fans (F1 to F4).

[0034] Further, heavy oil or the like can be also supplied, through the oil flow channel 3, for being used in ignition in the cement kiln burner 1. Also, solid fuel other than pulverized coal or liquid fuel such as heavy oil can be supplied thereto, for being used in mixed combustion together with pulverized coal, during normal operation (not illustrated).

[0035] FIG. 3 is a view schematically illustrating the movement of the wind velocity adjusting member 5 and the influence of the wind velocity adjusting member 5 on a wind velocity. In FIG. 3, for convenience of explanation, flow channels other than the first air flow channel 11 are not illustrated. The wind velocity adjusting member 5 of the first embodiment is a circular tubular member that is in contact with the inner peripheral wall 11a of the first air flow channel 11 and is not in contact with the outer peripheral wall 11b of the first air flow channel 11. Namely, the inner diameter of the wind velocity adjusting member 5 is the same as the diameter of the inner peripheral wall 11a of the first air flow channel 11, and the outer diameter of the wind velocity adjusting member 5 is smaller than the diameter of the outer peripheral wall 11b of the first air flow channel 11.

[0036] The wind velocity adjusting member 5 is configured to be movable along the axial direction (Y direction) in the first air flow channel 11. The wind velocity adjusting member 5 is moved along the axial direction by a frontward-rearward moving mechanism (for example, a rack and pinion mechanism) (not illustrated).

[0037] The wind velocity adjusting member 5 can change the cross-sectional area at the outlet 11c-side tip-end portion 11d of the first air flow channel 11 by moving along the axial direction in the first air flow channel 11. In FIG. 3, (a) illustrates a state where the wind velocity adjusting member 5 is retracted from the outlet 11c side of the first air flow channel 11, and (b) illustrates a state where the wind velocity adjusting member 5 is advanced toward the outlet 11c side of the first air flow channel 11. In the state illustrated in FIG. 3(a), the cross-sectional area of the tip-end portion 11d of the first air flow channel 11 is larger than that in the state illustrated in FIG. 3(b), and therefore the wind velocity of the air blown out from the first air flow channel 11 is small.

[0038] Meanwhile, in the state illustrated in FIG. 3(b), the cross-sectional area of the tip-end portion 11d of the first air flow channel 11 is smaller than that in the state illustrated in FIG. 3(a), and therefore the wind velocity of the air blown out from the first air flow channel 11 is large even when the airflow rate of supplied air is the same. The wind velocity adjusting member 5 is movable to an optional position other than the states illustrated in FIGS. 3(a) and 3(b), and the wind velocity of the air blown out from the first air flow channel 11 can be appropriately adjusted by changing the distance between the tip-end 51 of the wind velocity adjusting member 5 and the outlet 11c of the first air flow channel 11. Therefore, by moving the wind velocity adjusting member 5 along the axial direction of the first air flow channel 11, the wind velocity can be adjusted without changing the airflow rate of the air blown out from the first air flow channel 11.

[0039] As described above, the cement kiln burner 1 according to the first embodiment illustrated in FIGS. 1 to 3 is the cement kiln burner 1 having the plurality of columnar or cylindrical flow channels (2, 3, 4, 11, 12), and outlets of the respective flow channels (2, 3, 4, 11, 12) are disposed on substantially the same plane. Inside the first air flow channel 11, a wind velocity adjusting member 5 is provided. The wind velocity adjusting member 5 can change the cross-sectional area at the outlet 11c-side tip end portion 11d of the first air flow channel 11 by moving along the axial direction of the first air flow channel 11 in a state of being in contact with the inner peripheral wall 11a of the first air flow channel 11 and not in contact with the outer peripheral wall lib of the first air flow channel 11.

[0040] The method for operating the cement kiln burner 1 according to the first embodiment reduces the cross-sectional area at the tip-end portion 11d of the first air flow channel 11 by advancing the wind velocity adjusting member 5 toward the outlet 11c-side of the first air flow channel 11 when increasing the wind velocity of straight outer flows blown out from the first air flow channel 11. As a result, for example, when fuel having poor combustibility is used, the wind velocity of straight outer flows blown out from the first air flow channel 11 can be increased to promote combustion. The method for operating the cement kiln burner 1 according to the first embodiment increases the cross-sectional area at the tip-end portion 11d of the first air flow channel 11 by retracting the wind velocity adjusting member 5 from the outlet 11c side of the first air flow channel 11 when decreasing the wind velocity of straight outer flows blown out from the first air flow channel 11. As a result, for example, when fuel having good combustibility is used, the wind velocity of straight outer flows blown out from the first air flow channel 11 can be lowered to delay combustion.

Second Embodiment

[0041] A second embodiment of a cement kiln burner 1 according to the present invention will be described mainly on differences from the first embodiment. Components common to those of the first embodiment are denoted by the same reference numerals, and the description thereof is appropriately omitted.

[0042] In the first embodiment, the example in which the wind velocity adjusting member 5 is provided inside the first air flow channel 11 forming the straight air flows has been described, but the present invention is not limited thereto. For example, as in the second embodiment illustrated in FIG. 4, a wind velocity adjusting member 5 may be provided in a second air flow channel 12 forming swirl air flows.

[0043] FIG. 4 is a view schematically illustrating the movement of a wind velocity adjusting member 5 and the influence of the wind velocity adjusting member 5 on a wind velocity according to a second embodiment. In FIG. 4, for convenience of explanation, flow channels other than the second air flow channel 12 are not illustrated. The wind velocity adjusting member 5 of the second embodiment is a circular tubular member that is in contact with an outer peripheral wall 12b of the second air flow channel 12 and is not in contact with an inner peripheral wall 12a of the second air flow channel 12.

[0044] The wind velocity adjusting member 5 can change the cross-sectional area at the outlet 12c-side tip-end portion 12d of the second air flow channel 12 by moving along the axial direction in the second air flow channel 12. In FIG. 4, (a) illustrates a state where the wind velocity adjusting member 5 is retracted from the outlet 12c side of the second air flow channel 12, and (b) illustrates a state where the wind velocity adjusting member 5 is advanced toward the outlet 12c side of the second air flow channel 12. In the state illustrated in FIG. 4(a), the cross-sectional area of the tip-end portion 12d of the second air flow channel 12 is larger than that in the state illustrated in FIG. 4(b), and therefore the wind velocity of the air blown out from the second air flow channel 12 is small. Meanwhile, in the state illustrated in FIG. 4(b), the cross-sectional area of the tip-end portion 12d of the second air flow channel 12 is smaller than that in the state illustrated in FIG. 4(a), and therefore the wind velocity of the air blown out from the second air flow channel 12 is large even when the airflow rate of supplied air is the same. The wind velocity adjusting member 5 is movable to an optional position other than the states illustrated in FIGS. 4(a) and 4(b), and the wind velocity of the air blown out from the second air flow channel 12 can be appropriately adjusted by changing the distance between the tip-end 51 of the wind velocity adjusting member 5 and the outlet 12c of the second air flow channel 12. Therefore, by moving the wind velocity adjusting member 5 along the axial direction of the second air flow channel 12, the wind velocity can be adjusted without changing the airflow rate of the air blown out from the second air flow channel 12. Furthermore, the wind velocity of the air supplied to a swirl vane 12t changes, and therefore a swirl angle in the state illustrated in FIG. 4(b) becomes larger than that in the state illustrated in FIG. 4(a). The increase of the swirl angle of swirl air flows can further facilitate combustion.

Third Embodiment

[0045] A third embodiment of a cement kiln burner 1 according to the present invention will be described mainly on differences from the second embodiment. Components common to those of the second embodiment are denoted by the same reference numerals, and the description thereof is appropriately omitted.

[0046] In the second embodiment, the swirl vane 12t is provided so as to completely close the outlet 12c of the second air flow channel 12, but the present invention is not limited thereto. For example, as in the third embodiment illustrated in FIG. 5, a swirl vane 12t may be provided so as to close only a part of an outlet 12c of a second air flow channel 12. In this example, the swirl vane 12t has a circular tubular shape and is in contact with an inner peripheral wall 12a of the second air flow channel 12 and is not in contact with an outer peripheral wall 12b of the second air flow channel 12. The inner diameter of the wind velocity adjusting member 5 is larger than the outer diameter of the swirl vane 12t, and the wind velocity adjusting member 5 can move to the outlet 12c of the second air flow channel 12 along the axial direction outside the swirl vane 12t.

[0047] FIG. 5 is a view schematically illustrating the movement of a wind velocity adjusting member 5 and the influence of the wind velocity adjusting member 5 on a wind velocity according to a third embodiment. In FIG. 5, for convenience of explanation, flow channels other than the second air flow channel 12 are not illustrated. The wind velocity adjusting member 5 of the third embodiment has the same shape as that of the wind velocity adjusting member 5 of the second embodiment.

[0048] By moving the wind velocity adjusting member 5 along the axial direction of the second air flow channel 12, the wind velocity can be adjusted without changing the airflow rate of the air blown out from the second air flow channel 12. Furthermore, a swirl angle by the swirl vane 12t can also be adjusted by changing the airflow rate of the air supplied to the swirl vane 12t. In the state illustrated in FIG. 5(a), the air hardly passes through the swirl vane 12t, and therefore the swirl angle of air flows blown out from the second air flow channel 12 becomes substantially 0. Meanwhile, most of the air passes through the swirl vane 12t in the state illustrated in FIG. 5(b), and therefore the swirl angle of the air flows blown out from the second air flow channel 12 increases.

[0049] Note that the configuration of the cement kiln burner is not limited to that of the above-described embodiments, and the functions and effects of the cement kiln burner are not limited to those of the above-described embodiments. It is needless to say that various modifications can be made to the cement kiln burner without departing from the gist of the present invention. For example, the configurations, methods, and the like of the plurality of embodiments described above may be optionally adopted and combined. It is a matter of course that one or two or more of configurations, methods, and the like according to various modifications described below may be optionally selected and adopted for the configurations, methods, and the like according to the embodiments described above.

[0050] (1) In the first to third embodiments described above, the wind velocity adjusting member 5 is provided inside the cylindrical first or second air flow channel 11 or 12, but the present invention is not limited thereto. For example, the wind velocity adjusting member 5 may be provided inside the columnar combustible-solid-waste flow channel 4 or the cylindrical powdered-solid-fuel flow channel 2 illustrated in FIG. 1. The wind velocity adjusting member may be provided inside each of the plurality of flow channels.

[0051] (2) FIG. 6 is a transverse cross-sectional view of a cement kiln burner according to another embodiment. A cement kiln burner 1a illustrated in FIG. 6 is a calcining furnace burner installed at a kiln tail portion of a cement kiln (see FIG. 9). Namely, the cement kiln burner of the present invention includes not only a main fuel burner provided at a furnace front portion of a cement kiln, but also a burner (also referred to as calcining furnace burner) provided in a calcining furnace attached to the cement kiln.

[0052] The cement kiln burner 1a illustrated in FIG. 6 includes a columnar pulverized coal flow channel 13 and a diffusion air flow channel 14 disposed adjacent to and outside the pulverized coal flow channel 13. In an example of FIG. 6(a), the wind velocity adjusting member 5 is provided, which can change the cross-sectional area at the outlet-side tip-end portion of the diffusion air flow channel 14 by moving along the axial direction of the diffusion air flow channel 14 in a state of being in contact with the inner peripheral wall of the diffusion air flow channel 14 and not in contact with the outer peripheral wall of the diffusion air flow channel 14. In an example of FIG. 6(b), the wind velocity adjusting member 5 is provided, which can change the cross-sectional area at the outlet-side tip-end portion of the diffusion air flow channel 14 by moving along the axial direction of the diffusion air flow channel 14 in a state of being in contact with the outer peripheral wall of the diffusion air flow channel 14 and not in contact with the inner peripheral wall of the diffusion air flow channel 14. In an example of FIG. 6(c), in addition to the wind velocity adjusting member 5 of FIG. 6(b), the wind velocity adjusting member 5 is provided, which can change the cross-sectional area at the outlet-side tip-end portion of the pulverized coal flow channel 13 by moving along the axial direction of the pulverized coal flow channel 13 in a state of being in contact with the outer peripheral wall of the pulverized coal flow channel 13. As in the example of FIG. 6(c), the wind velocity adjusting member 5 may be provided inside each of the plurality of flow channels.

[0053] (3) In the above-described embodiments, the wind velocity adjusting member 5 is an integrally formed circular tubular member, but the present invention is not limited thereto. For example, as illustrated in FIG. 7(a), the wind velocity adjusting member 5 may be a circular tubular member divided into a plurality of parts in the circumferential direction. In this example, the wind velocity adjusting member 5 is divided into four wind velocity adjusting members 5a, and the wind velocity adjusting members 5a can each independently move along the axial direction. According to this configuration, it is possible to selectively move the wind velocity adjusting member 5a at a portion where the wind velocity is desired to be increased while observing a flame situation.

[0054] At least one of the four wind velocity adjusting members 5a illustrated in FIG. 7(a) may be provided as the wind velocity adjusting member. Namely, it is not necessary to provide the wind velocity adjusting members over the entire circumference of the flow channel, and the wind velocity adjusting members may be provided only in a part of the flow channel in the circumferential direction.

[0055] As illustrated in FIG. 7(b), the wind velocity adjusting member 5 may include a plurality of lance-shaped members 5b. The plurality of lance-shaped members 5b can each independently move along the axial direction. According to this configuration, it is possible to selectively move the lance-shaped member 5b at a portion where the wind velocity is desired to be increased while observing the flame situation.

EXAMPLES

[0056] The present inventors evaluated the influence of a wind velocity adjusting member on combustibility by the combustion simulation (software: FLUENT manufactured by ANSYS JAPAN K.K.) of a cement kiln burner.

Example 1

[0057] A cement kiln burner 1b illustrated in FIG. 8 was analyzed. The cement kiln burner 1b includes a powdered-solid-fuel flow channel 2, a swirl inner flow channel 15 disposed adjacent to and on the inside of the powdered-solid-fuel flow channel 2, a swirl outer flow channel 16 disposed adjacent to and outside the powdered-solid-fuel flow channel 2, and a straight outer flow channel 17 disposed adjacent to and outside the swirl outer flow channel 16. Further, an oil flow channel 3, a combustible-solid-waste flow channel 4 and the like are disposed on the inside of the swirl inner flow channel 15. In the powdered-solid-fuel flow channel 2, the swirl inner flow channel 15, and the swirl outer flow channel 16, swirl vanes (2t, 15t, 16t) are respectively fixed to burner tip-end portions of the flow channels. A wind velocity adjusting member is not illustrated in FIG. 8.

<Burner Combustion Conditions>

[0058] Combustion amount of pulverized coal as powdered solid fuel: 15 t/hour

[0059] Processed amount of waste plastic (non-rigid plastic) as combustible solid waste: 3 t/hour

<Waste Plastic Conditions>

[0060] Size of waste plastic as combustible solid waste: a circular sheet having a diameter of 30 mm and formed by punching a sheet having a thickness of 0.5 mm

<Secondary Air Conditions>

[0061] Amount and temperature of secondary air: 150000 Nm.sup.3/hour, 800 C.

<Primary Air Conditions>

[0062] Using a wind velocity and a primary air ratio at the outlet of the burner in the following Table 1 as a base (specification), the wind velocity adjusting member provided inside the flow channel was moved from a position where the wind velocity adjusting member was pulled out by 0.5 m from the outlet of the burner to a position where the wind velocity adjusting member was pushed into the outlet (0 mm) of the burner. The wind velocity adjusting member was provided in only one of flow channels (2, 4, 15, 16, 17), and moved. A wind velocity when the distance between the tip of the wind velocity adjusting member and the outlet of the burner was 0.5 mm and a wind velocity when the distance between the tip of the wind velocity adjusting member and the outlet of the burner was 0 mm were as shown in Table 2 below.

<Evaluation Items>

[0063] The falling rate of waste plastic when the distance between the tip of the wind velocity adjusting member and the outlet of the burner was changed was subjected to simulation analysis. The falling rate of the waste plastic is a ratio of the falling waste plastic among the discharged waste plastic. The evaluation results of the falling rate (% by volume) of the waste plastic are shown in Table 3.

TABLE-US-00001 TABLE 1 Wind velocity Primary at outlet of air ratio Swirl burner of base % by angle Flow channel name m/s volume Degree Combustible-solid-waste flow 50 3.5 0 channel Swirl inner flow channel 150 2.0 30 Powdered-solid-fuel flow channel 50 3.5 10 Swirl outer flow channel 150 2.0 30 Straight outer flow channel 250 3.0 0

TABLE-US-00002 TABLE 2 Distance between tip of wind velocity adjusting member and outlet of burner 0.5 m 0 m Wind velocity at outlet of burner Flow channel name m/s Combustible-solid-waste flow channel 30 80 Swirl inner flow channel 100 240 Powdered-solid-fuel flow channel 30 80 Swirl outer flow channel 100 240 Straight outer flow channel 100 400

TABLE-US-00003 TABLE 3 Falling rate of waste plastic [% by volume] Distance between tip of wind velocity adjusting member and outlet of burner [m] Flow channel name 0.50 0.40 0.30 0.20 0.10 0.05 0.02 0.00 Combustible-solid-waste flow channel 12 12 12 12 12 11 10 9 Swirl inner flow channel 14 14 14 12 10 7 3 1 Powdered-solid-fuel flow channel 7 7 7 7 7 6 4 2 Swirl outer flow channel 15 15 15 15 13 10 5 2 Straight outer flow channel 20 20 19 17 13 9 5 0

[0064] As shown in Table 3, by advancing the wind velocity adjusting member toward the outlet side of the burner and increasing the wind velocity, the combustion of the waste plastic was promoted, and therefore the falling rate of the waste plastic could be reduced.

Reference Example

[0065] In the cement kiln burner 1b illustrated in FIG. 8, the wind velocity adjusting member was provided and fixed in the straight outer flow channel 17, and the amount of the waste plastic was changed to confirm the maximum gas temperature in a kiln and the falling rate of the waste plastic.

[0066] The maximum gas temperature in the kiln is suitably 1860 C. to 1920 C. from the viewpoint of the heat resistance of bricks in the kiln and the quality of clinkers. The falling rate of the waste plastic is suitably 0% from the viewpoint of the quality of clinkers.

[0067] <Burner combustion conditions>, <Waste plastic conditions>, and <Secondary air conditions> are the same as in Example 1.

<Primary Air Conditions>

[0068] Based on Table 1 of Example 1, the position of the wind velocity adjusting member provided in the straight outer flow channel 17 was adjusted so that the wind velocity at the outlet of the burner was 400 m/s and 350 m/s.

<Evaluation Items>

[0069] The maximum temperature ( C.) of gas in the kiln and the falling rate (% by volume) of the waste plastic were subjected to simulation analysis. The evaluation results when the wind velocity at the outlet of the burner is 400 m/s are shown in Table 4, and the evaluation results when the wind velocity at the outlet of the burner is 350 m/s are shown in Table 5.

TABLE-US-00004 TABLE 4 Wind velocity at outlet of burner: 400 m/s Conditions Results Presence or Falling rate absence of Amount of waste Maximum gas wind velocity of waste plastic temperature Level adjusting plastic % by in kiln no. Level name member t/hr volume C. Comment 1 Plastic 0 t/h Presence 0 0 2340 Concern about erosion of bricks 2 Plastic 1 t/h Presence 1 0 2180 Concern about erosion of bricks 3 Plastic 2 t/h Presence 2 0 2090 Concern about erosion of bricks 4 Plastic 3 t/h Presence 3 0 1910 Good (falling rate: 0% and within range of 1890 C. 30 C.)

TABLE-US-00005 TABLE 5 Wind velocity at outlet of burner: 350 m/s Conditions Results Presence or Falling rate absence of Amount of waste Maximum gas wind velocity of waste plastic temperature Level adjusting plastic % by in kiln no. Level name member t/hr volume C. Comment 1 Plastic 0 t/h Presence 0 0 2183 Concern about erosion of bricks 2 Plastic 1 t/h Presence 1 0 1997 Concern about erosion of bricks 3 Plastic 2 t/h Presence 2 0 1870 Good (falling rate: 0% and within range of 1890 C. 30 C.) 4 Plastic 3 t/h Presence 3 9 1710 Concern about deterioration in quality of crimpers

[0070] When the wind velocity at the outlet of the burner shown in Table 4 was 400 m/s, the maximum temperature of gas in the kiln was within a range of 1890 C.30 C., which was an appropriate temperature, under the condition that the amount of the waste plastic was 3 t/h, whereas when the amount of the waste plastic was less than 3 t/h, the maximum gas temperature increased to outside of the appropriate temperature range, which caused a concern about the erosion of refractory bricks. When the wind velocity at the outlet of the burner shown in Table 5 was 350 m/s, the maximum temperature of gas in the kiln was within the appropriate temperature range under the condition of the amount of the waste plastic of 2 t/h, whereas at the amount of the waste plastic of 3 t/h, the maximum gas temperature decreased to outside of the appropriate temperature range, which caused a concern about deterioration in the quality of clinkers. At the amount of the waste plastic of 1 t/h or less, the maximum temperature increased to outside of the appropriate temperature range, which caused a concern about the erosion of refractory bricks. Namely, it was suggested that the appropriate wind velocity at the outlet of the burner is present according to the amount of the waste plastic, which makes it possible to cope with various amounts of the waste plastic by adjusting the wind velocity at the outlet using the wind velocity adjusting member.

Example 2

[0071] A cement kiln burner 1c illustrated in FIG. 9 was analyzed. As illustrated in FIG. 9(a), the cement kiln burner 1c is a burner for a calcining furnace 91 installed at a kiln tail portion 9a of a cement kiln 9. The inner diameter of the cement kiln 9 was 3.5 mm, and the inner diameter of the calcining furnace 91 was 2.0 mm. As illustrated in FIG. 9(b), the cement kiln burner 1c includes a columnar pulverized coal flow channel 13 and a diffusion air flow channel 14 disposed adjacent to and outside the pulverized coal flow channel 13. A wind velocity adjusting member is not illustrated in FIG. 9.

<Burner Combustion Conditions>

[0072] Combustion amount of pulverized coal: 3 t/hour

<Secondary Air Conditions>

[0073] Amount and temperature of secondary air: 160,000 Nm.sup.3/hour, 1000 C.

<Primary Air Conditions>

[0074] Using a wind velocity and a primary air ratio at the outlet of a burner in the following Table 6 as a base (specification), the wind velocity adjusting member provided inside the flow channel was moved from a position where the wind velocity adjusting member was pulled out by 0.5 m from the outlet of the burner to a position where the wind velocity adjusting member was pushed into the outlet (0 mm) of the burner. The wind velocity adjusting member was provided in only one of the flow channels (13, 14), and moved. A wind velocity when the distance between the tip of the wind velocity adjusting member and the outlet of the burner was 0.5 mm and a wind velocity when the distance between the tip of the wind velocity adjusting member and the outlet of the burner was 0 mm were as shown in Table 7 below.

<Evaluation Items>

[0075] A pulverized coal combustion rate at an outlet 91a of the calcining furnace 91 when the distance between the tip of the wind velocity adjusting member and the outlet of the burner was changed was subjected to simulation analysis. The evaluation results of the pulverized coal combustion rate (% by weight) are shown in Table 8.

TABLE-US-00006 TABLE 6 Wind velocity at outlet of Primary Swirl burner of base air ratio angle Flow channel name m/s % by volume Degree Pulverized coal flow channel 50 2.0 0 Diffusion air flow channel 50 1.0 20

TABLE-US-00007 TABLE 7 Distance between tip of wind velocity adjusting member and outlet of burner 0.5 m 0 m Wind velocity at outlet of burner Flow channel name m/s Pulverized coal flow channel 20 80 Diffusion air flow channel 20 80

TABLE-US-00008 TABLE 8 Combustion rate of pulverized coal [% by weight] distance between tip of wind velocity adjusting Flow channel member and outlet of burner [m] name 0.50 0.40 0.30 0.20 0.10 0.05 0.02 0.00 Pulverized coal 60 60 60 63 70 79 88 97 flow channel Diffusion air 60 60 62 67 79 90 100 100 flow channel

[0076] As shown in Table 8, by advancing the wind velocity adjusting member toward the outlet side of the burner and increasing the wind velocity, the combustion of pulverized coal was promoted, and therefore the combustion rate of the pulverized coal could be increased.

DESCRIPTION OF REFERENCE SIGNS

[0077] 1 Cement kiln burner [0078] 1a Cement kiln burner [0079] 1b Cement kiln burner [0080] 1c Cement kiln burner [0081] 2 Powdered-solid-fuel flow channel [0082] 2t Swirl vane [0083] 3 Oil flow channel [0084] 4 Combustible-solid-waste flow channel [0085] 5 Wind velocity adjusting member [0086] 5a Wind velocity adjusting member [0087] 5b lance-shaped member [0088] 9 Cement kiln [0089] 9a Kiln tail portion [0090] 11 First air flow channel [0091] 11a Inner peripheral wall of first air flow channel [0092] 11b Outer peripheral wall of first air flow channel [0093] 11c Outlet of first air flow channel [0094] 11d Outlet-side tip-end portion of first air flow channel [0095] 12 Second air flow channel [0096] 12a Inner peripheral wall of second air flow channel [0097] 12b Outer peripheral wall of second air flow channel [0098] 12c Outlet of second air flow channel [0099] 12d Outlet-side tip-end portion of second air flow channel [0100] 12t Swirl vane [0101] 13 Pulverized coal flow channel [0102] 14 Diffusion air flow channel [0103] 15 Swirl inner flow channel [0104] 16 Swirl outer flow channel [0105] 17 Straight outer flow channel [0106] 20 Cement kiln burner system [0107] 21 Pulverized-coal transfer pipe [0108] 22 Air pipe [0109] 23 Air pipe [0110] 24 Combustible-solid-waste transfer pipe [0111] 91 Calcining furnace [0112] 91a Outlet of calcining furnace