Flue gas waste heat utilization equipment for hot-dip galvanizing

Abstract

The utility model solves the problem that a water body in a water storage tank is easily heated unevenly when a flue gas circulation pipeline is introduced into the water storage tank, and relates to the technical field of flue gas waste heat utilization, in particular to flue gas waste heat utilization equipment for hot-dip galvanizing, which comprises the water storage tank, an exhaust fan is arranged on the front side of the water storage tank, and the exhaust fan is arranged on the rear side of the water storage tank. The input end of the exhaust fan is connected with a purification assembly, one end of the purification assembly is connected with a smoke inlet pipe, the output end of the exhaust fan is connected with a circulation pipeline located in the water storage tank, the circulation pipeline comprises an inlet pipe inserted into the water storage tank, one end of the inlet pipe is connected with a spiral pipe and an arc-shaped pipe, and the end of the arc-shaped pipe is connected with a vertical pipe. The spiral pipe is arranged around the outer side of the vertical pipe, and a plurality of branch pipes which are arranged up and down are connected between the vertical pipe and the spiral pipe. According to the utility model, flue gas with less heat dissipation can be supplemented into different layers in the spiral pipe, so that the uniform heating effect at different heights in the water storage tank is effectively improved.

Description

A waste heat recovery device for hot-dip galvanizing flue gas Technical Field

[0001] This utility model relates to the field of flue gas waste heat utilization technology, specifically to a flue gas waste heat utilization device for hot-dip galvanizing. Background Technology

[0002] Hot-dip galvanizing generates a large amount of high-temperature flue gas containing significant heat. By using a waste heat recovery device to collect this heat, it can be used to heat air, water, or other media, thus achieving energy reuse. This not only reduces energy consumption during hot-dip galvanizing but also provides a heat source for other production processes, enabling comprehensive energy utilization.

[0003] Conventional hot-dip galvanizing flue gas waste heat recovery devices usually conduct hot flue gas through spiral tubes. However, as the hot flue gas flows along the path of the multi-layer spiral tube, its heat will gradually dissipate. The heat near the discharge end of the spiral tube is much lower than the heat near the inlet end. In this case, it is easy to cause uneven heating of cold water at different heights in the water storage tank, resulting in local overheating or insufficient heating. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a waste heat recovery device for hot-dip galvanizing flue gas, so as to solve the problem of uneven heating of the water in the water storage tank when flue gas is introduced into the water storage tank through the pipe mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a waste heat utilization device for hot-dip galvanizing flue gas, comprising a water storage tank, an exhaust fan provided on the front of the water storage tank, a purification component connected to the input end of the exhaust fan, a flue gas inlet pipe connected to one end of the purification component, and a flow pipe located inside the water storage tank connected to the output end of the exhaust fan.

[0006] The circulation pipeline includes an inlet pipe inserted into the water storage tank. One end of the inlet pipe is connected to a spiral pipe and an arc-shaped pipe. The end of the arc-shaped pipe is connected to a vertical pipe. The spiral pipe is arranged around the outside of the vertical pipe. Several branch pipes arranged vertically are connected between the vertical pipe and the spiral pipe.

[0007] Preferably, the top end of the spiral tube passes through the top cover of the water storage tank, and the inner diameter of the several branch tubes gradually increases from bottom to top, and the branch tubes are arranged at an upward inclination from bottom to top.

[0008] Preferably, the purification component includes a connecting pipe connected to the input end of the exhaust fan, and a filter structure is installed between the connecting pipe and the smoke inlet pipe, wherein the inner diameter of the connecting pipe is smaller than the inner diameter of the smoke inlet pipe.

[0009] Preferably, the filter structure includes a rectangular frame connected to the smoke inlet pipe, and two two-section perforated plates arranged front to back are installed on the inner wall of the rectangular frame. A partition plate is installed in the middle of the two two-section perforated plates, and activated carbon perforated plates are provided on both sides of the partition plate.

[0010] Preferably, the inner width of the rectangular frame is twice the inner diameter of the smoke inlet pipe, and a sealing block is provided inside the rectangular frame. The cross-section of the sealing block is an isosceles triangle, and the width of the back of the sealing block is half of the two-section perforated plate.

[0011] A helical screw is rotatably connected between the two sides of the rectangular frame, and one end of the helical screw passes through the sealing block. A guide rod passing through the sealing block is installed between the inner walls of the two sides of the rectangular frame.

[0012] Preferably, the top of the water storage tank is connected to an inlet pipe, and the middle of the bottom surface of the water storage tank is connected to a drain pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. The spiral tube designed in this utility model allows the flue gas to travel a longer path through the water storage tank, which is beneficial to the heat exchange efficiency. At the same time, with the addition of several branch tubes on the vertical tube, flue gas with less heat dissipation is added to different layers inside the spiral tube. Moreover, the amount of flue gas added gradually increases from bottom to top of the spiral tube, thereby ensuring a uniform heating effect at different heights inside the water storage tank.

[0015] 2. This utility model forms a dual-channel filtration system by using a two-section perforated plate, a partition plate, and two activated carbon perforated plates. In addition, the positional relationship between the sealing block and the two-section perforated plate on the front side can be adjusted by a rotating screw, which facilitates the alternating use of the dual-channel filtration. When replacing one of the activated carbon perforated plates, it is not necessary to cut off the flow of the entire channel, thus ensuring the continuity of waste heat utilization of flue gas from the hot-dip galvanizing furnace. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 is a schematic diagram of the purification component of this utility model;

[0018] Figure 3 is a schematic diagram of the filter structure of this utility model;

[0019] Figure 4 is a schematic diagram of the positional structure of the two-section orifice plate and the sealing block of this utility model.

[0020] In the diagram: 1. Water storage tank; 101. Water inlet pipe; 2. Exhaust fan; 3. Purification component; 301. Connecting pipe; 302. Filter structure; 3021. Rectangular frame; 3022. Two-section perforated plate; 3023. Separator plate; 3024. Activated carbon perforated plate; 303. Sealing block; 304. Helical screw; 305. Guide rod; 4. Smoke inlet pipe; 5. Flow pipe; 501. Inlet pipe; 502. Arc-shaped pipe; 503. Helical pipe; 504. Vertical pipe; 505. Branch pipe. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please refer to Figures 1-4. This utility model proposes a waste heat recovery device for hot-dip galvanizing flue gas, including a water storage tank 1. An exhaust fan 2 is mounted on the front of the water storage tank 1. A purification component 3 is connected to the input end of the exhaust fan 2. One end of the purification component 3 is connected to a flue gas inlet pipe 4, which is connected to the hot-dip galvanizing furnace body. This inlet pipe guides the flue gas generated during the operation of the hot-dip galvanizing furnace towards the purification component 3. The output end of the exhaust fan 2 is connected to a flow pipe 5 located inside the water storage tank 1. In practical application, the flue gas inside the hot-dip galvanizing furnace is guided outward through the flue gas inlet pipe 4, and the exhaust fan 2 generates suction to quickly extract the flue gas from the inside of the inlet pipe 4. During this process, the flue gas passes through the purification component 3 to remove most of the dust and particulate matter. The flue gas extracted by the exhaust fan 2 is then dispersed inside the flow pipe 5, and the waste heat of the flue gas is used to heat the cold water stored inside the water storage tank 1.

[0023] Specifically, the flow pipe 5 includes an inlet pipe 501 inserted into the water storage tank 1. The inlet pipe 501 contains a constricted section at its tail end, the inner diameter of which gradually decreases from front to back, thereby increasing the flow rate of the flue gas flowing backward through the inlet pipe 501. One end of the inlet pipe 501 is connected to a spiral pipe 503 and an arc-shaped pipe 502. The top end of the spiral pipe 503 passes upward through the top cover of the water storage tank 1, and the end of the arc-shaped pipe 502 is connected to a vertical pipe 504. The spiral pipe 503 is arranged around the outside of the vertical pipe 504, and several vertically arranged branch pipes 505 are connected between the vertical pipe 504 and the spiral pipe 503. As shown in Figure 1, the purified flue gas is dispersed and introduced into the spiral pipe 503 and the arc-shaped pipe 502 through the inlet pipe 501. Part of the flue gas flows spirally upwards along the path of the spiral tube 503, adapting to the upward flow trend of hot flue gas, and can transfer the waste heat of the flue gas to the cold water at different heights inside the water storage tank 1. In addition, since the spiral tube 503 is spiral in shape, the flue gas has a longer path when passing through the water storage tank 1, which increases the surface area in contact with water and the heat exchange time, thus improving the heat exchange efficiency.

[0024] Additionally, some of the flue gas entering the arc-shaped tube 502 will disperse along the path of the vertical tube 504 into several branch tubes 505, thereby replenishing the relatively hot flue gas into different layers of the spiral tube 503, effectively improving the uniformity of flue gas heat in different layers of the spiral tube 503. Furthermore, the inner diameter of the branch tubes 505 gradually increases from bottom to top, ensuring that the volume of flue gas replenished into different layers of the spiral tube 503 through the vertical tube 504 gradually increases from bottom to top, which matches the gradual decrease in heat of the original flue gas in the spiral tube 503 from bottom to top. The branch tubes 505 are arranged at an upward inclination from bottom to top, harmonizing with the upward flow trend of the hot flue gas.

[0025] As shown in Figures 2-4, the purification component 3 includes a connecting pipe 301 connected to the input end of the exhaust fan 2. A filter structure 302 is installed between the connecting pipe 301 and the smoke inlet pipe 4. The inner diameter of the connecting pipe 301 is smaller than the inner diameter of the smoke inlet pipe 4. During the process of the flue gas in the smoke inlet pipe 4 being transported into the connecting pipe 301, dust and particulate matter can be intercepted by the filter structure 302.

[0026] Specifically, the filter structure 302 includes a rectangular frame 3021 connected to the smoke inlet pipe 4. The inner width of the rectangular frame 3021 is twice the inner diameter of the smoke inlet pipe 4. Two two-section perforated plates 3022 arranged front and back are installed on the inner wall of the rectangular frame 3021. A partition plate 3023 is installed in the middle of the two two-section perforated plates 3022, dividing the rectangular frame 3021 into two flue gas flow channels. Activated carbon perforated plates 3024 are provided on both sides of the partition plate 3023. A sealing block 303 is provided inside the rectangular frame 3021, and the width of the back of the sealing block 303 is half that of the two-section perforated plates 3022. A spiral screw 304 is rotatably connected between the two sides of the rectangular frame 3021, and one end of the spiral screw 304 passes through the sealing block 303. A guide rod 305 passing through the sealing block 303 is installed between the inner walls of the two sides of the rectangular frame 3021. In practical applications, the blocking block 303 fits against the inner wall of one side of the rectangular frame 3021, thereby blocking half of the area of ​​the two-section perforated plate 3022 on the front side, preventing flue gas from passing through the activated carbon perforated plate 3024 located behind the blocking block 303. Furthermore, by rotating the screw 304 in the set direction, the blocking block 303 can be controlled to move along the guide rod 305 towards the unblocked half of the two-section perforated plate 3022 on the front side, blocking the entry channel of the already used activated carbon perforated plate 3024 behind that area. At the location of the other activated carbon perforated plate 3024, flue gas can flow normally. Therefore, it can be ensured that when the top cover of the rectangular frame 3021 is opened to replace the used activated carbon perforated plate 3024, the flow of the entire channel does not need to be interrupted, ensuring the continuity of waste heat utilization from the hot-dip galvanizing furnace flue gas.

[0027] Specifically, the blocking block 303 has an isosceles triangle cross-section with inclined sides, which has a certain guiding effect on the flue gas.

[0028] A water inlet pipe 101 is inserted into the top of the water storage tank 1. The water inlet pipe 101 is used to connect to an external water supply device and is intended to add cold water that needs to be heated into the water storage tank 1. A drain pipe is connected to the middle of the bottom surface of the water storage tank 1. The drain pipe is equipped with a solenoid valve, which opens when the heated hot water is discharged, adjusting the drain pipe to a clear state to facilitate the outward flow of hot water.

[0029] It should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for hot-dip galvanizing flue gas, comprising a water storage tank (1), characterized in that: The front of the water storage tank (1) is provided with an exhaust fan (2), and a purification component (3) is connected to the input end of the exhaust fan (2). One end of the purification component (3) is connected to a smoke inlet pipe (4), and the output end of the exhaust fan (2) is connected to a flow pipe (5) located inside the water storage tank (1). The flow pipe (5) includes an inlet pipe (501) inserted into the water storage tank (1). One end of the inlet pipe (501) is connected to a spiral pipe (503) and an arc pipe (502). The end of the arc pipe (502) is connected to a vertical pipe (504), and the spiral pipe (503) is arranged around the outside of the vertical pipe (504). Several branch pipes (505) arranged vertically are connected between the vertical pipe (504) and the spiral pipe (503).

2. The waste heat recovery equipment for hot-dip galvanizing flue gas as described in claim 1, characterized in that: The top end of the spiral tube (503) passes through the top cover of the water storage tank (1) upwards, and the inner diameter of several branch tubes (505) gradually increases from bottom to top, and the branch tubes (505) are arranged in an upward inclined manner from bottom to top.

3. The waste heat recovery equipment for hot-dip galvanizing flue gas as described in claim 1, characterized in that: The purification component (3) includes a connecting pipe (301) connected to the input end of the exhaust fan (2), and a filter structure (302) is installed between the connecting pipe (301) and the smoke inlet pipe (4). The inner diameter of the connecting pipe (301) is smaller than the inner diameter of the smoke inlet pipe (4).

4. The waste heat recovery equipment for hot-dip galvanizing flue gas according to claim 3, characterized in that: The filter structure (302) includes a rectangular frame (3021) connected to the smoke inlet pipe (4). The inner wall of the rectangular frame (3021) is equipped with two two-section perforated plates (3022) arranged in front and behind. A partition plate (3023) is installed in the middle of the two two-section perforated plates (3022). Activated carbon perforated plates (3024) are provided on both sides of the partition plate (3023).

5. The waste heat recovery equipment for hot-dip galvanizing flue gas as described in claim 4, characterized in that: The inner width of the rectangular frame (3021) is twice the inner diameter of the smoke inlet pipe (4). A sealing block (303) is provided inside the rectangular frame (3021). The cross section of the sealing block (303) is an isosceles triangle. The back width of the sealing block (303) is half that of the two-section perforated plate (3022).

6. The waste heat recovery equipment for hot-dip galvanizing flue gas according to claim 4, characterized in that: A helical screw (304) is rotatably connected between the two sides of the rectangular frame (3021), and one end of the helical screw (304) passes through the sealing block (303). A guide rod (305) passing through the sealing block (303) is installed between the inner walls of the two sides of the rectangular frame (3021).

7. The waste heat recovery equipment for hot-dip galvanizing flue gas according to claim 1, characterized in that: The top of the water storage tank (1) is connected to an inlet pipe (101), and the middle of the bottom surface of the water storage tank (1) is connected to a drain pipe.

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