Straight fin for device for recovering waste heat of raw coke oven gas in ascension pipe of coke oven, and heat recovering device

Abstract

A straight fin for a device for recovering the waste heat of raw coke oven gas in the ascension pipe of the coke oven includes the straight fin body and a group of V-shaped notches disposed on the straight fin body. The depth h of the V-shaped notches is less than the width H of the straight fin body. The distances between the adjacent V-shaped notches increase from bottom to top in the longitudinal direction of the straight fin body. The present invention further provides a heat recovering device and a power generation device both including the straight fins. Moreover, the width, the angle, and the distances in the longitudinal direction of the V-shaped notches at the top of the straight fin are determined according to the temperature field distribution during use of the device.

Claims

1. A straight fin for a device for recovering waste heat of raw coke oven gas in an ascension pipe of a coke oven, comprising: a straight fin body and a plurality of V-shaped notches disposed on the straight fin body; a depth of the plurality of V-shaped notches is less than a width of the straight fin body; and distances between the V-shaped notches adjacent to each other increase from bottom to top in a longitudinal direction of the straight fin body, wherein the plurality of V-shaped notches are sequentially numbered Q1 to Qn1 from bottom to top in the longitudinal direction of the straight fin body; a distance from Q1 to a bottom of the straight fin body is L1, the distances between the V-shaped notches adjacent to each other from bottom to top are L2 to Ln1, and a distance from Qn1 to a top of the straight fin body is Ln; and values of L1 to Ln increase.

2. The straight fin for the device for recovering the waste heat of the raw coke oven gas in the ascension pipe of the coke oven according to claim 1, wherein L1 to Ln form an arithmetic sequence.

3. The straight fin for the device for recovering the waste heat of the raw coke oven gas in the ascension pipe of the coke oven according to claim 1, wherein each V-shaped notch has an equal opening angle, and each V-shaped notch has an equal depth.

4. A device for recovering waste heat of raw coke oven gas in an ascension pipe of a coke oven, comprising at least one straight fin according to claim 1.

5. The device for recovering the waste heat of the raw coke oven gas in the ascension pipe of the coke oven according to claim 4, comprising a raw coke oven gas pipe drum, a heat transfer tube, and a plurality of straight fins; the heat transfer tube is disposed tightly on an outer wall of the raw coke oven gas drum; the plurality of straight fins are disposed on an inner wall of the raw coke oven gas drum; a raw coke oven gas inlet is provided with a lower flange and a raw coke oven gas outlet is provided with an upper flange for the raw coke oven gas drum; an expansion joint is provided at an upper part of the raw coke oven gas pipe drum; and the heat transfer tube is provided with a heat transfer medium inlet at a lower part and a heat transfer medium outlet at an upper part.

6. The device for recovering the waste heat of the raw coke oven gas in the ascension pipe of the coke oven according to claim 5, wherein the plurality of straight fins are disposed at a same interval along a circumference of the inner wall of the raw coke oven gas drum; and the plurality of straight fins are vertically disposed along the inner wall of the raw coke oven gas drum.

7. A coke oven ascension pipe waste heat boiler power generation device, comprising the straight fin according to claim 1.

8. The coke oven ascension pipe waste heat boiler power generation device according to claim 7, comprising a waste heat boiler, a heat medium pump, a steam turbine, a water pump, a power generation device, and a plurality of devices for recovering the waste heat of the raw coke oven gas in the ascension pipe of the coke oven; the waste heat boiler comprises a heat medium pipeline and a steam-water circulation pipeline; a heat medium outlet of the device for recovering the waste heat of the raw coke oven gas in the ascension pipe of the coke oven is connected to the heat medium pipeline and the heat medium pump of the waste heat boiler sequentially, the heat medium pump is connected to the heat medium inlet of each device for recovering the waste heat of the raw coke oven gas in the ascension pipe of the coke oven; the steam-water circulation pipeline, the steam turbine, and the water pump of the waste heat boiler are sequentially connected as a ring; and the power generation device is connected to the steam turbine.

9. The coke oven ascension pipe waste heat boiler power generation device according to claim 7, comprising a distributed ascension pipe raw coke oven gas evaporator set, a distributed ascension pipe raw coke oven gas superheater set, a steam drum, a water circulation pump, a steam turbine, a water-feeding pump, and a power generation device; the distributed ascension pipe raw coke oven gas evaporator set and the distributed ascension pipe raw coke oven gas superheater set each separately comprise a plurality of devices for recovering the waste heat of the raw coke oven gas in the ascension pipe of the coke oven that are connected in parallel; the steam drum is provided with a steam-water mixture inlet pipe, a saturated steam outlet pipe, a water inlet, and a water outlet; the distributed ascension pipe raw coke oven gas evaporator set is connected to the steam-water mixture inlet of the steam drum; the saturated steam outlet pipe of the steam drum, the distributed ascension pipe raw coke oven gas superheater set, the steam turbine, the water-feeding pump, and the water inlet of the steam drum are sequentially connected; the water outlet of the steam drum is connected to the water circulation pump, and the water circulation pump is connected to the distributed ascension pipe raw coke oven gas evaporator set; and the power generation device is connected to the steam turbine.

10. The device for recovering the waste heat of the raw coke oven gas in the ascension pipe of the coke oven according to claim 4, wherein each V-shaped notch have an equal opening angle, and each V-shaped notch has an equal depth.

11. The device for recovering the waste heat of the raw coke oven gas in the ascension pipe of the coke oven according to claim 10, comprising a raw coke oven gas pipe drum, a heat transfer tube, and a plurality of straight fins; the heat transfer tube is disposed tightly on an outer wall of the raw coke oven gas drum; the plurality of straight fins are disposed on an inner wall of the raw coke oven gas drum; a raw coke oven gas inlet is provided with a lower flange and a raw coke oven gas outlet is provided with an upper flange for the raw coke oven gas drum; an expansion joint is provided at an upper part of the raw coke oven gas pipe drum; and the heat transfer tube is provided with a heat transfer medium inlet at a lower part and a heat transfer medium outlet at an upper part.

12. The device for recovering the waste heat of the raw coke oven gas in the ascension pipe of the coke oven according to claim 11, wherein the plurality of straight fins are disposed at a same interval along a circumference of the inner wall of the raw coke oven gas drum; and the plurality of straight fins are vertically disposed along the inner wall of the raw coke oven gas drum.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic structural diagram of a straight fin according to the present invention.

(2) FIG. 2 is a schematic structural diagram of a device for recovering the waste heat of raw coke oven gas in an ascension pipe of a coke oven according to the present invention.

(3) FIG. 3 is a schematic structural diagram of a method for disposing of the straight fins in circumference of the raw coke oven gas drum wall.

(4) FIG. 4 is a schematic structural diagram of a coke oven ascension pipe waste heat boiler power generation device according to Embodiment 3.

(5) FIG. 5 is a schematic structural diagram of a coke oven ascension pipe waste heat boiler power generation device according to Embodiment 4.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(6) The following further describes the present invention.

Embodiment 1

(7) A straight fin for a device for recovering waste heat of raw coke oven gas in an ascension pipe of a coke oven is provided, as shown in FIG. 1, and includes a straight fin body (1) and a group of V-shaped notches (2) disposed on the straight fin body (1); the depth h of the V-shaped notches (2) is less than the width H of the straight fin body (1); and the distances between the adjacent V-shaped notches (2) increase from bottom to top in the longitudinal direction of the straight fin body (1).

(8) The group of V-shaped notches (2) are sequentially numbered Q1 to Qn1 from bottom to top in the longitudinal direction of the straight fin body (1); a distance from Q1 to the bottom of the straight fin body (1) is L1, the distances of the adjacent V-shaped notches (2) from bottom to top are L2 to Ln1, and a distance from Qn1 to the top is Ln; and L1 to Ln form an arithmetic sequence, and optionally, that values of L1 to Ln increase can also achieve the objective of the present invention.

(9) The group of V-shaped notches (2) have an equal opening angle , and the group of V-shaped notches (2) have an equal depth h.

(10) A batch of straight fins are prepared, referring to Table 1.

(11) TABLE-US-00001 TABLE 1 Tolerance of Opening an arithmetic Number H/mm h/mm width/mm L1/mm sequence/mm Straight fin 1 60 40 3 600 100 Straight fin 2 60 40 3 600 50 Straight fin 3 60 40 3 600 150 Straight fin 4 60 40 3 600 0 Straight fin 5 60 40 2 600 100 Straight fin 6 60 40 1 600 100 Straight fin 7 60 30 3 600 100 Straight fin 8 60 20 3 600 100 Straight fin 9 H is 60 mm; h is 40 mm, and an opening width is 3 mm; L1 is 600 mm; distances among LI, L3, L5, . . . are equal, and the distance is 100 mm; and distances among L2, L4, L6, . . . are equal, and the distance is 50 mm. Straight fin 10 H is 60 mm; h is 40 mm, and an opening width is 3 mm; L1 is 600 mm; distances among LI, L3, L5, . . . are equal, and the distance is 100 mm; and distances among L2, L4, L6, . . . are equal, and the distance is 150 mm.

Embodiment 2

(12) A device for recovering the waste heat of raw coke oven gas in an ascension pipe of a coke oven is provided, as shown in FIG. 2, and includes a raw coke oven gas drum (11), a heat transfer tube (12), and a group of straight fins (13) according to Embodiment 1. The heat transfer tube (12) is disposed tightly on the outer surface of the raw coke oven gas drum wall (11). The group of straight fins (13) are disposed on the inner surface of the raw coke oven gas drum wall (11). There is a raw coke oven gas inlet provided with a lower flange (14) and a raw coke oven gas outlet provided with an upper flange (15) for the raw coke oven gas drum (11). There is an expansion joint (16) at the top of the raw coke oven gas drum (11). At the lower part of the heat transfer tube (12) there is a heat transfer medium inlet (17), and at the upper part, there is a heat transfer medium outlet (18).

(13) In the present invention, the group of straight fins (13) is vertically disposed at the same interval along the circumference of the inner wall of the raw coke oven gas drum (11), as shown in FIG. 3. Optionally, regardless of whether the group of straight fins (13) are vertically disposed along the circumference of the inner wall of raw coke oven gas drum (11), the objective of the present invention can be achieved.

(14) The straight fins which are numbered from 1 to 10 in Embodiment 1 are separately mounted on the device for recovering the waste heat of raw coke oven gas in the ascension pipe of the coke oven. In each, the raw coke oven gas are with the approximately same inlet temperature T1 introduced to the raw coke oven gas drum (11), the outlet temperature T2 of the raw coke oven gas, the temperature T3 of the top of the straight fin in the width direction of different heights (H1), and the temperature T4 of the bottom of the straight fin in the width direction of different heights (H1), all the results above are shown in Table 2.

(15) TABLE-US-00002 TABLE 2 Number H1/mm T1/ C. T2/ C. T3/ C. T4/ C. Description (compared with 1) Straight fin 1 800 805 650 520.5 466.1 Effect is best Straight fin 2 800 801 655 545.1 465.1 There are more notches, an area is smaller, a heat transfer effect is poorer, and a temperature drop of gas is smaller Straight fin 3 800 800 648 554.5 480.2 There are less notches, and a temperature is higher and an expansion amount is larger at the top and the bottom of the fin Straight fin 4 800 800 658 546.5 478.6 There are slightly more notches, an area is even smaller than 2, a heat transfer effect is poorer, and a temperature drop of gas is even smaller Straight fin 5 800 800 648 558.5 474.6 Notches are smaller, and an expansion amount is larger at the top of the fin, indicating that a temperature is higher Straight fin 6 800 800 649 560.5 475.1 Notches are smaller, and an expansion amount is larger at the top of the fin, indicating that a temperature is higher Straight fin 7 800 800 648 565.8 476.4 Height of notches are smaller, and a temperature is even higher at the top of the fin Straight fin 8 800 801 650 570.7 481.5 Height of notches are smaller, and a temperature is even higher at the top of the fin Straight fin 9 800 800 655 549.5 469.8 An area is smaller, and a temperature drop of raw coke oven gas is smaller Straight fin 800 800 648 552.5 473.5 Temperature at the top of the fin is 10 even higher

Embodiment 3

(16) A coke oven ascension pipe waste heat boiler power generation device is provided as shown in FIG. 4. It includes a waste heat boiler (22), a heat medium pump (23), a steam turbine (24), a water pump (25), a power generation device (26), and a group of devices (21) for recovering the waste heat of raw coke oven gas in the ascension pipe of a coke oven according to Embodiment 2. The waste heat boiler (22) includes a heat medium pipeline and a steam-water circulation pipeline. A heat medium outlet (18) of the device (21) for recovering the waste heat of raw coke oven gas in the ascension pipe of the coke oven is connected to the heat medium pipeline and the heat medium pump (23) of the waste heat boiler (22) sequentially. The heat medium pump (23) is connected to the heat medium inlet (17) of each device (21) for recovering the waste heat of raw coke oven gas in the ascension pipe of the coke oven. The steam-water circulation pipeline, the steam turbine (24), and the water pump (25) of the waste heat boiler (22) are sequentially connected as a ring. The power generation device (26) is connected to the steam turbine (24).

(17) Using the coke products with 1300,000 tons per year coking as an example, the temperature of the raw coke oven gas inlet to the ascension pipe is about 800 C. Currently, it is reduced to 70 C. by spraying aqueous ammonia.

(18) Renovation is performed thereto, and this coke oven ascension pipe waste heat boiler power generation device of a heat medium circulation type (including the straight fin 1) is used, so that the raw coke oven gas waste heat can be recovered, and the steam of 2.0 MPa pressure is superheated to be 250 C. The steam products is up to 123,000 tons per year. The steam is connected to the power generation system, and the annual power generation can reach 20 million kWh, bringing remarkable economic benefits.

Embodiment 4

(19) A coke oven ascension pipe waste heat boiler power generation device is provided, as shown in FIG. 5. It includes a distributed ascension pipe raw coke oven gas evaporator set (31), a distributed ascension pipe raw coke oven gas superheater set (32), a steam drum (34), a circulation pump (35), a steam turbine (36), a water-feeding pump (37), and a power generation device (38). The distributed ascension pipe raw coke oven gas evaporator set (31) and the distributed ascension pipe raw coke oven gas superheater set (32) each separately include a group of devices (33) for recovering the waste heat of raw coke oven gas in the ascension pipe of the coke oven according to Embodiment 2 that are connected in parallel. The steam drum (34) is provided with a steam-water mixture inlet pipe, a saturated steam outlet pipe, a water inlet, and a water outlet. The distributed ascension pipe raw coke oven gas evaporator set (31) is connected to the steam-water mixture inlet of the steam drum (34). The saturated steam outlet pipe of the steam drum (34), the distributed ascension pipe raw coke oven gas superheater set (32), the steam turbine (36), the water-feeding pump (37), and the water inlet of the steam drum (34) are sequentially connected. The water outlet of the steam drum (34) is connected to the circulation pump (35). The circulation pump (35) is connected to the distributed ascension pipe raw coke oven gas evaporator set (31). The power generation device (38) is connected to the steam turbine (36). A water replenishment pipeline (39) is further included, and the water replenishment pipeline (39) is connected between the steam turbine (36) and the water-feeding pump (37).

(20) Using the coke products with 1000,000 tons per year coking as an example, a temperature of raw coke oven gas inlet to the ascension pipe is about 750 C. Currently, it is reduced to 70 C. by spraying aqueous ammonia.

(21) Renovation is performed thereto, and this coke oven ascension pipe waste heat boiler power generation device of a heat medium circulation type (including the straight fin 1) is used, to recover the raw coke oven gas waste heat. The steam is of 0.8 MPa pressure is superheated to 250 C. The steam products is up to 90,000-120,000 tons per year. Or the steam is of 3.82 MPa pressure can be superheated to 300 C., and the products can be up to 80,000-100,000 tons per year. The steam is connected to a power generation system, and annual power generation can reach 15 million kWh, bringing remarkable economic benefits.

(22) In view of the foregoing ideal embodiments of the present invention and based on the foregoing descriptive content, various changes and modifications may be definitely made by a person skilled in the art without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the content in this specification, and the technical scope of the present invention should be determined according to the claims.