A new flue

Abstract

The utility model relates to desulfurization system field discloses a novel flue, including original flue and the upper clean flue, connecting pipe and lower clean flue that communicate in proper order, original flue includes gas inlet, straight -through pipe and gas outlet, connecting pipe includes expansion diameter portion, back type portion and reducing diameter portion, and the middle part of back type portion is equipped with passageway, and straight -through pipe passes through passageway and penetrates out back type portion, and the inner wall of expansion diameter portion is equipped with the splitter plate, and the included angle between one end of expansion diameter portion close to gas outlet and back type portion upper end is less than the included angle between one end of expansion diameter portion close to gas inlet and back type portion upper end, and the inner wall of expansion diameter portion is equipped with a plurality of first baffle, and each first baffle all inclines to the direction of gas outlet, and the straight -through pipe of original flue penetrates through the passageway of back type portion middle part transversely, makes original flue and clean flue form nested layout in vertical and horizontal direction, does not need to occupy the additional site outside original flue gas heat exchanger area, avoids the problem that flue gas heat exchanger removes after site narrow, traditional flue needs to replan the land occupation.

Description

Technical Field

[0001] This utility model relates to the field of desulfurization systems, specifically to a novel flue. Background Technology

[0002] In thermal power plants, flue gas heat exchangers are mainly used to recover waste heat from flue gas, increase exhaust temperature, aid in the operation of desulfurization systems, and reduce white smoke. However, during operation, the flue gas contains a large amount of dust and sulfides, which easily accumulate inside the heat exchanger, clogging the flow channels and increasing pressure drop. Furthermore, when the flue gas temperature is below the acid dew point, sulfuric acid condenses, corroding metal components and causing seal failure. This allows undesulfurized flue gas to leak into the clean flue gas, affecting desulfurization efficiency and posing a risk of exceeding environmental standards. Consequently, the flue gas heat exchanger needs cleaning or component replacement, increasing the power plant's operating costs and maintenance workload. To address this, existing plants remove the flue gas heat exchangers to reduce the operation and maintenance costs, power consumption, and maintenance workload of the desulfurization system. However, the installation space after dismantling the heat exchanger is narrow, and rearranging the flue would significantly reduce the plant's production efficiency. Therefore, we propose a new type of flue to solve the above problems. Utility Model Content

[0003] The present invention aims to provide a novel flue to solve the problem of narrow installation space after the flue gas heat exchanger is disassembled, and the reduction of factory production efficiency if the flue is rearranged.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a novel flue, comprising an original flue and an upper clean flue, a connecting pipe, and a lower clean flue connected in sequence. The original flue includes an air inlet, a straight pipe, and an air outlet connected in sequence. The connecting pipe includes an expanding section, a shaped section, and a contracting section connected in sequence. A channel is provided in the middle of the shaped section, and the straight pipe passes through the channel and exits the shaped section. The air inlet and the air outlet are located on both sides of the shaped section. A diverter plate is provided on the inner wall of the expanding section. The diverter plate can divert the clean flue gas to both sides of the shaped section. The angle between the end of the expanding section near the air outlet and the upper end of the shaped section is smaller than the angle between the end of the expanding section near the air inlet and the upper end of the shaped section. A plurality of first guide plates are provided on the inner wall of the expanding section, and each first guide plate is inclined towards the air outlet.

[0005] The beneficial effects of this solution are as follows: The straight pipe of the original flue runs horizontally through the channel in the middle of the loop section, so that the original flue and the clean flue form a nested layout in the vertical and horizontal directions. It does not require additional space outside the original flue gas heat exchanger area, avoiding the problems of narrow space after the removal of the flue gas heat exchanger and the need to replan the land for traditional flue. It reduces the cost and construction complexity of power plant site transformation. At the same time, the straight pipe and the connecting pipe of the original flue have no common wall contact, and the loop section forms a closed clean flue gas flow path around the straight pipe. Even if the inner wall of the flue is slightly damaged due to corrosion after long-term operation, the undesulfurized original flue gas and the desulfurized clean flue gas will not mix, thereby avoiding the risk of reduced desulfurization efficiency and exceeding environmental standards.

[0006] Preferably, as an improvement, the first guide plate includes an integrally formed vertical part and a bent part. The vertical part extends into the upper clean flue, and the two ends of the bent part are fixedly connected to the inner wall of the diameter-expanding part, respectively. The included angle between the bent part and the vertical part is set to 120°-130°.

[0007] The beneficial effects are as follows: the vertical section extends into the upper clean flue, which can guide the clean flue gas before it enters the expansion section. The clean flue gas in the upper clean flue flows vertically downward. The vertical section can divert the airflow in advance, avoiding disorderly diffusion of the airflow due to the sudden increase in the cross-section of the expansion section.

[0008] Preferably, as an improvement, a deflector is provided at the end of the air outlet away from the straight pipe, and a number of second guide plates are provided on the inner wall of the deflector.

[0009] Preferably, as an improvement, the second guide vane is configured as an arc shape.

[0010] Preferably, as an improvement, the distance between the inner wall of the channel and the outer wall of the straight pipe is set to 500mm.

[0011] The beneficial effects are as follows: Since the installation area size is fixed after the original flue gas heat exchanger is removed, the distance between the inner wall of the channel and the outer wall of the straight pipe is set to 500mm. Under this gap, there is no need to expand the original space range. It can be completely accommodated within the equipment installation boundary of the original flue gas heat exchanger, avoiding the increase in the overall volume of the flue due to excessive gap, and avoiding the encroachment on other equipment or maintenance channels. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the novel flue according to an embodiment of the present utility model; Figure 2 This is a cross-sectional view of the original flue in an embodiment of the present invention; Figure 3 This is a side cross-sectional view of the connecting pipe according to an embodiment of the present utility model; Figure 4This is a front cross-sectional view of the connecting pipe in an embodiment of the present invention. Detailed Implementation

[0013] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: original flue 1, upper clean flue 2, connecting pipe 3, lower clean flue 4, air inlet 5, straight pipe 6, air outlet 7, turning pipe 8, second guide plate 9, diameter expansion section 10, loop section 11, diameter reduction section 12, channel 13, flow divider 14, first guide plate 15, vertical section 16, and bending section 17.

[0014] Example The basic implementation examples are as follows: Figures 1-4 As shown, Figure 1 The novel flue shown includes an original flue 1 and, from top to bottom, an upper clean flue 2, a connecting pipe 3, and a lower clean flue 4 connected sequentially. Figure 2 The original flue duct 1 shown includes an air inlet 5, a straight pipe 6, and an air outlet 7 connected sequentially from left to right. A deflector pipe 8 is connected to the right end of the air outlet 7. Several second guide plates 9 are fixedly installed on the inner wall of the deflector pipe 8, and each second guide plate 9 is arc-shaped, thereby guiding the horizontally flowing original flue gas in the straight pipe 6 to flow upwards. Figure 3 and Figure 4 The connecting pipe 3 shown includes an expanding section 10, a return section 11, and a reducing section 12 connected sequentially from top to bottom. The upper end of the expanding section 10 is connected to the upper clean flue 2, and the lower end of the reducing section 12 is connected to the lower clean flue 4. The return section 11 has a channel 13 in the middle, and the straight pipe 6 passes through the channel 13 and exits the return section 11. Figure 1 The air inlet 5 is located on the left side of the connecting pipe 3, and the air outlet 7 is located on the right side of the connecting pipe 3. The distance between the inner wall of the channel 13 and the outer wall of the straight pipe 6 is set to 500mm. Figure 3 The angle between the right end of the expanded diameter portion 10 and the upper end of the loop-shaped portion 11 is smaller than the angle between the left end of the expanded diameter portion 10 and the upper end of the loop-shaped portion 11. In this embodiment, the angle between the right end of the expanded diameter portion 10 and the upper end of the loop-shaped portion 11 is set to 36°, and the angle between the left end of the expanded diameter portion 10 and the upper end of the loop-shaped portion 11 is set to 80°. Figure 4 A flow divider 14 is fixedly installed on the inner wall of the expanded diameter section 10 shown. The flow divider 14 is configured as a triangular prism and can divert the clean flue gas to the left and right sides of the return section 11, such as... Figure 3 A plurality of first guide plates 15 are fixedly installed on the inner wall of the diameter-expanding section 10 shown. In this embodiment, three first guide plates 15 are provided, and each first guide plate 15 is inclined to the right side of the diameter-expanding section 10. The first guide plate 15 includes an integrally formed vertical part 16 and a bent part 17, such as... Figure 3The vertical portion 16 extends into the upper flue 2. The two ends of the vertical portion 16 can be fixed to the inner wall of the upper flue 2 by welding. The two ends of the bent portion 17 are fixedly connected to the inner wall of the expanded diameter portion 10. The included angle between the bent portion 17 and the vertical portion 16 is set to 120°-130°. In this embodiment, the included angle between the bent portion 17 and the vertical portion 16 is set to 126°, so that the bent portion 17 is parallel to the right end of the expanded diameter portion 10.

[0015] Because the space on the upper right side of the expanded diameter section 10 is narrow after the flue gas heat exchanger is removed, in order to avoid modifying the existing pipes and devices, the space above the right end of the expanded diameter section 10 is enlarged by reducing the included angle between the right end of the expanded diameter section 10 and the upper end of the U-shaped section 11. Since the upper end of the expanded diameter section 10 needs to be kept flush, the following occurs: Figure 3 The space on the right side of the loop section 11 shown is larger than the space on the left side of the loop section 11, which causes the clean flue gas to deflect to the right and induce local eddies. In this solution, the clean flue gas in the upper clean flue duct 2 is diverted by setting the first guide plate 15, so that the clean flue gas flowing into the loop section 11 is more uniform and local eddies are avoided in the loop section 11.

[0016] In this scheme, the straight pipe 6 of the original flue duct 1 runs horizontally through the channel 13 in the middle of the loop section 11, so that the original flue duct 1 and the clean flue duct form a nested layout in the vertical and horizontal directions. It does not require additional space outside the original flue gas heat exchanger area, avoiding the problem of narrow space after the removal of the flue gas heat exchanger and the need to replan the land for traditional flue ducts. It reduces the cost and construction complexity of power plant site renovation. At the same time, the straight pipe 6 of the original flue duct 1 and the connecting pipe 3 have no common wall contact, and the loop section 11 forms a closed clean flue gas flow path around the straight pipe 6. Even if the inner wall of the flue duct is slightly damaged due to corrosion after long-term operation, the undesulfurized original flue gas and the desulfurized clean flue gas will not mix, thereby avoiding the risk of desulfurization efficiency decline and environmental protection exceeding standards.

[0017] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A novel flue, characterized in that: It includes the original flue and the upper clean flue, connecting pipe and lower clean flue connected in sequence. The original flue includes the air inlet, straight pipe and air outlet connected in sequence. The connecting pipe includes the expansion section, the return section and the reduction section connected in sequence. The return section has a channel in the middle. The straight pipe passes through the channel and exits the return section. The air inlet and air outlet are located on both sides of the return section. The inner wall of the expansion section is provided with a diverter plate. The diverter plate can divert the clean flue gas to both sides of the return section. The angle between the end of the expansion section near the air outlet and the upper end of the return section is smaller than the angle between the end of the expansion section near the air inlet and the upper end of the return section. The inner wall of the expansion section is provided with a number of first guide plates. Each first guide plate is inclined towards the air outlet.

2. The novel flue according to claim 1, characterized in that: The first guide plate includes an integrally formed vertical part and a bent part. The vertical part extends into the upper clean flue, and the two ends of the bent part are fixedly connected to the inner wall of the diameter expansion part. The included angle between the bent part and the vertical part is set to 120°-130°.

3. The novel flue according to claim 2, characterized in that: A deflector is provided at the end of the air outlet away from the straight pipe, and several second guide plates are provided on the inner wall of the deflector.

4. The novel flue according to claim 3, characterized in that: The second deflector is designed in an arc shape.

5. A novel flue according to claim 4, characterized in that: The distance between the inner wall of the channel and the outer wall of the straight pipe is set to 500mm.

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