HEAT EXCHANGER TUBE BLOCK, EXHAUST HEAT RECOVERY BOILER, AND METHOD OF CONSTRUCTING EXHAUST HEAT RECOVERY BOILER

Abstract

A heat exchanger tube block is stacked on another heat exchanger tube block in an upper-lower direction and connected to the another heat exchanger tube block. The heat exchanger tube block includes: a duct casing wherein exhaust gas containing dust flows in the upper-lower direction; a heat exchanger tube in the duct casing extends horizontally; an inlet header connects to the heat exchanger tube inlet; an outlet header connected to an outlet of the heat exchanger tube; and a vibration transmitting member transmitting vibration, applied to an upper end part of the vibration transmitting member, to the heat exchanger tube to make the dust accumulating on the heat exchanger tube fall. A lower end of the duct casing is formed horizontally. The inlet header is located higher than the lower end of the duct casing. The outlet header is located higher than the lower end of the duct casing.

Claims

1. A heat exchanger tube block stacked on another heat exchanger tube block in an upper-lower direction and connected to the another heat exchanger tube block, the heat exchanger tube block comprising: a duct casing in which exhaust gas containing dust flows in the upper-lower direction; a heat exchanger tube located in the duct casing and extending in a horizontal direction; an inlet header connected to an inlet of the heat exchanger tube; an outlet header connected to an outlet of the heat exchanger tube; and a vibration transmitting member configured to transmit vibration, applied to an upper end part of the vibration transmitting member, to the heat exchanger tube to make the dust accumulating on the heat exchanger tube fall, wherein: a lower end of the duct casing is formed horizontally; the inlet header is located higher than the lower end of the duct casing; and the outlet header is located higher than the lower end of the duct casing.

2. The heat exchanger tube block according to claim 1, wherein the upper end part of the vibration transmitting member projects to an outside of the duct casing.

3. The heat exchanger tube block according to claim 1, wherein: the duct casing includes a lower recess formed such that an outer surface of the duct casing is concave inward; and the lower recess is located under the vibration transmitting member and is formed so as to open downward and outward in the horizontal direction.

4. The heat exchanger tube block according to claim 1, wherein: the inlet header is located lower than an upper end of the duct casing; and the outlet header is located lower than the upper end of the duct casing.

5. The heat exchanger tube block according to claim 1 wherein: the duct casing includes a hollow portion located under the heat exchanger tube; and the inlet header is arranged at a position corresponding to the hollow portion.

6. The heat exchanger tube block according to claim 3, wherein: the duct casing includes a hollow portion located under the heat exchanger tube; and the lower recess is formed at a position corresponding to the hollow portion.

7. The heat exchanger tube block according to claim 1 wherein: the duct casing includes an upper recess formed such that an outer surface of the duct casing is concave inward; the upper recess is formed so as to open upward and outward in the horizontal direction; and the upper end part of the vibration transmitting member is located in a region defined by the upper recess.

8. An exhaust heat recovery boiler comprising a plurality of heat exchanger tube blocks each of which is the heat exchanger tube block according to claim 1, wherein the plurality of heat exchanger tube blocks are stacked on each other in the upper-lower direction and connected to each other.

9. A method of manufacturing an exhaust heat recovery boiler, the method comprising stacking a plurality of heat exchanger tube blocks, each of which is the heat exchanger tube block according to claim 1, on each other in the upper-lower direction and connecting the plurality of heat exchanger tube blocks to each other.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0023] FIG. 1 is a schematic diagram showing a heat exchanger tube block according to Embodiment 1.

[0024] FIG. 2 is a schematic diagram showing a heat exchanger tube block according to Modified Example of Embodiment 1.

[0025] FIG. 3 is a schematic diagram showing a heat exchanger tube block according to Embodiment 2.

[0026] FIG. 4 is a schematic diagram showing a heat exchanger tube block according to Modified Example of Embodiment 2.

DESCRIPTION OF EMBODIMENTS

Embodiment 1

[0027] First, a heat exchanger tube block 100 according to Embodiment 1 will be described. FIG. 1 is a schematic diagram showing the heat exchanger tube block 100 according to Embodiment 1. The following will be described on the basis that regarding the directions of the heat exchanger tube block 100, upper, lower, near, deep, left, and right sides on the paper surface of FIG. 1 are respectively referred to as upper, lower, front, rear, left, and right sides.

[0028] The heat exchanger tube block 100 constitutes part of an exhaust heat recovery boiler 101 configured to recover heat from exhaust gas. The heat exchanger tube block 100 is manufactured in a factory different from a construction site of the exhaust heat recovery boiler 101 and is then conveyed to the construction site. Moreover, as shown in FIG. 1, a plurality of heat exchanger tube blocks 100 are stacked on each other in the upper-lower direction and connected to each other. To be specific, the exhaust heat recovery boiler 101 includes a plurality of heat exchanger tube blocks 100 stacked on each other in the upper-lower direction and connected to each other. Moreover, the exhaust heat recovery boiler 101 is constructed by stacking a plurality of heat exchanger tube blocks 100 on each other in the upper-lower direction and connecting the plurality of heat exchanger tube blocks 100 to each other.

[0029] The heat exchanger tube block 100 according to the present embodiment includes a duct casing 10, heat exchanger tubes 20, an inlet header 30, outlet headers 40, and a vibration transmitting member 50. The following will describe these components in order.

[0030] Duct Casing

[0031] The duct casing 10 constitutes part of a duct through which the exhaust gas flows. Upper and lower surfaces of the duct casing 10 are open. The duct casing 10 is formed in a tubular shape having a substantially rectangular section. The exhaust gas flows in the duct casing 10 in the upper-lower direction (downward in the present embodiment). Moreover, the exhaust gas flowing in the duct casing 10 contains a large amount of dust. The exhaust gas of the present embodiment is assumed to be exhaust gas generated in the process of manufacturing cement. However, the exhaust gas is not limited to this.

[0032] As shown in FIG. 1, a lower end of the duct casing 10 is formed horizontally, and an upper end of the duct casing 10 is also formed horizontally. A grounding surface which contacts a floor of a cargo bed when conveying the heat exchanger tube block 100 is the lower end of the duct casing 10, and the lower end of the duct casing 10 is formed horizontally. Therefore, the heat exchanger tube block 100 can be stably mounted on the cargo bed without using a special jig or the like. On this account, the conveying work of the heat exchanger tube block 100 can be efficiently performed.

[0033] Moreover, the duct casing 10 includes an accommodating portion 11 accommodating the heat exchanger tube 20 and a hollow portion 12 located under the heat exchanger tube 20. Since the duct casing 10 includes the hollow portion 12, an operator can enter into the hollow portion 12 and easily perform maintenance of the heat exchanger tube 20 and the inlet header 30.

[0034] Furthermore, the duct casing 10 includes: an upper recess 13 located at an upper-left portion and formed such that an outer surface of the duct casing 10 is concave inward; and a lower recess 14 located at a lower-left portion and formed such that the outer surface of the duct casing 10 is concave inward. The upper recess 13 is formed to be open toward the upper side and the left side (outward in a horizontal direction), and the lower recess 14 is formed to be open toward the lower side and the left side (outward in the horizontal direction). The front and rear sides of the upper recess 13 and the front and rear sides of the lower recess 14 are closed in the present embodiment but may be open.

[0035] The lower recess 14 is formed at a position which is located under the vibration transmitting member 50 and corresponds to the hollow portion 12. Specifically, the lower recess 14 is formed at the same height position as the hollow portion 12. Since the heat exchanger tube 20 is not provided at the hollow portion 12, the shapes and sizes of components around the hollow portion 12 can be set relatively freely. Therefore, the lower end of the duct casing 10 can be formed horizontally, and in addition, the lower recess 14 can be easily formed under the vibration transmitting member 50.

[0036] Heat Exchanger Tube

[0037] The heat exchanger tube 20 is a member configured to transfer heat from the exhaust gas, which flows along an outer surface of the heat exchanger tube 20, to water or steam which flows in the heat exchanger tube 20. The heat exchanger tube 20 is arranged so as to extend horizontally, and the exhaust gas contains a large amount of dust. Therefore, when the exhaust heat recovery boiler 101 operates, the dust gradually accumulates on the heat exchanger tube 20. When the dust accumulates on the heat exchanger tube 20, a heat exchange rate significantly lowers. Therefore, as described below, in the present embodiment, the dust accumulating on the heat exchanger tube 20 is made to fall periodically by utilizing the vibration transmitting member 50.

[0038] Inlet Header

[0039] The inlet header 30 is a member connected to an inlet of the heat exchanger tube 20. The heat exchanger tube block 100 according to the present embodiment includes one inlet header 30 but may include a plurality of inlet headers 30. The inlet header 30 extends in the front-rear direction and is located lower than the upper end of the duct casing 10 and higher than the lower end of the duct casing 10. More specifically, the inlet header 30 is provided at the hollow portion 12 of the duct casing 10. It should be noted that the inlet header 30 may be arranged outside the duct casing 10. To be specific, the inlet header 30 is arranged at a position corresponding to the hollow portion 12, such as a position inside the hollow portion 12 or a position outside the hollow portion 12. It should be noted that the inlet header 30 may be arranged higher than the hollow portion 12. For example, as shown in FIG. 2, the inlet header 30 may be arranged at the same height position as the heat exchanger tube 20 and outside the duct casing 10.

[0040] Water or steam is supplied to the inlet header 30, and the supplied water or steam is distributed to the heat exchanger tubes 20. It should be noted that the water herein may denote hot water or saturated water, and the steam may denote saturated steam or superheated steam. In the present embodiment, by providing the inlet header 30 at the hollow portion 12 of the duct casing 10, the inlet header 30 can be located lower than the heat exchanger tube 20 and higher than the lower end of the duct casing 10. With this, the lower end of the duct casing 10 can be used as the grounding surface when conveying the heat exchanger tube block 100.

[0041] Outlet Header

[0042] Each of the outlet headers 40 is a member connected to an outlet of the heat exchanger tube 20. The heat exchanger tube block 100 according to the present embodiment includes two outlet headers 40 but may include one outlet header 40 or three or more outlet headers 40. The outlet headers 40 are located outside the duct casing 10 and at the right side of the duct casing 10. Each of the outlet headers 40 recovers the steam from the corresponding heat exchanger tube 20 through an inlet pipe 41 and stores the steam once. Then, the outlet header 40 discharges the steam through a discharge pipe 42 to a facility (not shown).

[0043] Moreover, both of the outlet headers 40 are located higher than the lower end of the duct casing 10 and lower than the upper end of the duct casing. Since the outlet headers 40 of the present embodiment are arranged as above, the dimension of the duct casing 10 in the upper-lower direction is equal to the dimension of the heat exchanger tube block 100 in the upper-lower direction. To be specific, according to the present embodiment, the dimension of the heat exchanger tube block 100 in the upper-lower direction can be made smaller than when the outlet headers 40 are located lower than the lower end of the duct casing 10 or higher than the upper end of the duct casing 10. As a result, the conveying work of the heat exchanger tube block 100 can be efficiently performed. It should be noted that in FIG. 1, etc., the outlet headers 40 are located higher than the inlet header 30. However, the outlet headers 40 may be located lower than the inlet header 30.

[0044] Vibration Transmitting Member

[0045] The vibration transmitting member 50 is a member configured to transmit vibration, applied from a vibration generator, to the heat exchanger tube 20 (not shown). The vibration generator may be an apparatus configured to generate vibration by utilizing a so-called striking hammer or an apparatus configured to generate vibration by utilizing ultrasound, a motor, air (soot blower), a piezoelectric element, a shock wave, or the like. The heat exchanger tube 20 is connected to the vibration transmitting member 50. When vibration is transferred to the heat exchanger tube 20, the heat exchanger tube 20 vibrates, and the dust accumulating on the heat exchanger tube 20 falls.

[0046] The vibration transmitting member 50 extends upward from an inside of the duct casing 10, and an upper end part of the vibration transmitting member 50 projects to an outside of the duct casing 10. The upper end part of the vibration transmitting member 50 is located at the upper recess 13, and an upper end of the vibration transmitting member 50 is located higher than the upper end of the duct casing 10. It should be noted that the vibration transmitting member 50 may be arranged such that the upper end of the vibration transmitting member 50 is located lower than the upper end of the duct casing 10. Moreover, the vibration transmitting member 50 may be formed integrally from its lower end part to its upper end part or may be formed by separate portions. For example, the vibration transmitting member 50 may be formed by separate portions that are: a portion connected to the heat exchanger tube 20; and a portion including a part projecting to an outside of the duct casing 10. When the vibration transmitting member 50 is formed by separate portions, distortion caused by thermal expansion can be suppressed.

[0047] The vibration transmitting member 50 and the vibration generator may interfere with the heat exchanger tube block 100 adjacently located at the upper side. However, according to the heat exchanger tube block 100 of the present embodiment, the duct casing 10 includes the lower recess 14. Therefore, when a plurality of heat exchanger tube blocks 100 are stacked on each other in the upper-lower direction, the vibration transmitting member 50 is located in the lower recess 14 of the heat exchanger tube block 100 adjacently located at the upper side. On this account, according to the heat exchanger tube block 100 of the present embodiment, the vibration transmitting member 50 and the vibration generator can be prevented from interfering with the heat exchanger tube block 100 adjacently located at the upper side.

[0048] As above, the heat exchanger tube block 100 according to the present embodiment includes a large number of members, such as the vibration transmitting member 50. Therefore, much work, such as attaching work of the vibration transmitting member 50, at the construction site can be omitted. On this account, the assembly work of the exhaust heat recovery boiler 101 can be efficiently performed. Moreover, according to the heat exchanger tube block 100 of the present embodiment, since the lower end, formed horizontally, of the duct casing 10 serves as the grounding surface which contacts the floor of the cargo bed, the use of the special jig during conveyance can be omitted. As a result, the conveying work of the heat exchanger tube block 100 can be efficiently performed.

Embodiment 2

[0049] Next, a heat exchanger tube block 200 according to Embodiment 2 will be described. FIG. 3 is a schematic diagram showing the heat exchanger tube block 200 according to Embodiment 2. Regarding components of the heat exchanger tube block 200 according to Embodiment 2, the same reference signs are used in FIG. 3 for the same or corresponding components as in Embodiment 1, and the repetition of the same explanation is avoided.

[0050] As shown in FIG. 3, the upper recess 13 of the heat exchanger tube block 200 according to the present embodiment is formed larger than the upper recess 13 of the heat exchanger tube block 100 according to Embodiment 1. The upper end part of the vibration transmitting member 50 is located in a region defined by the upper recess 13. Therefore, the vibration transmitting member 50 is located lower than the upper end of the duct casing 10. It should be noted that the duct casing 10 of the present embodiment does not include the lower recess 14 but may include the lower recess 14.

[0051] Moreover, according to the duct casing 10 of the present embodiment, the hollow portion 12 is located above the heat exchanger tube 20, and the upper recess 13 is formed at the position corresponding to the hollow portion 12. Moreover, the inlet header 30 is located outside the duct casing 10, whereas the outlet headers 40 are provided at the hollow portion 12. However, as shown in FIG. 4, the outlet headers 40 may be located outside the duct casing 10.

[0052] As above, according to the heat exchanger tube block 200 of the present embodiment, the upper end part of the vibration transmitting member 50 is located in the region defined by the upper recess 13. Therefore, when the heat exchanger tube blocks 200 are stacked on each other in the upper-lower direction, the vibration transmitting member 50 and the vibration generator can be prevented from interfering with the heat exchanger tube block 200 adjacently located at the upper side. Moreover, since the lower end of the duct casing 10 of the present embodiment is also formed horizontally as with Embodiment 1, the conveying work of the heat exchanger tube block 200 can be efficiently performed.

REFERENCE SIGNS LIST

[0053] 10 duct casing

[0054] 12 hollow portion

[0055] 13 upper recess

[0056] 14 lower recess

[0057] 20 heat exchanger tube

[0058] 30 inlet header

[0059] 40 outlet header

[0060] 50 vibration transmitting member

[0061] 100 heat exchanger tube block

[0062] 101 exhaust heat recovery boiler

[0063] 200 heat exchanger tube block