Water-cooling dust removal device for high-temperature flue gas dechlorination of waste incineration power plant

Abstract

The utility model discloses a water-cooling dust removal device for high-temperature flue gas dechlorination of a waste incineration power plant. The water-cooling dust removal device comprises a cyclone separation cylinder and a dust removal flue, a high-temperature flue gas inlet is formed in the upper part of the cyclone separation barrel to be connected to an incinerator, and a fly ash outlet is formed in the bottom of the cyclone separation barrel; one end of the dust removal flue penetrates through the top of the cyclone separation barrel and extends into the cyclone separation barrel, and a high-temperature flue gas outlet is formed in the other end of the dust removal flue; an annular water cooling device is sleeved on the outer side of the cyclone separation cylinder; a water cooling coil pipe is sleeved on the part, positioned on the outer side of the cyclone separation cylinder, in the dust removal flue; high-temperature flue gas discharged by the incinerator enters the cyclone separation barrel for gas-solid separation and primary cooling, then enters the dust removal flue for secondary cooling and is discharged into the high-temperature flue gas dechlorination tower. The cooling device has the characteristics of compact structure, high stability, high cooling efficiency and the like.

Description

Technical Field

[0001] This utility model relates to the field of waste incineration technology, specifically to a water-cooled dust removal device for high-temperature flue gas dechlorination in waste incineration power plants. Background Technology

[0002] Municipal solid waste has a complex composition, with a high chlorine content, which produces high-temperature flue gas with a high hydrogen chloride content after combustion. Taking an 850t / d incinerator at a waste-to-energy plant as an example, the flue gas temperature entering the waste heat boiler at the furnace outlet can reach over 750℃. The hydrogen chloride in the flue gas, upon contact with the heating surfaces, easily causes high-temperature chlorine corrosion, severely shortening the equipment's lifespan. To reduce the corrosion of the waste heat boiler's heating surfaces by hydrogen chloride gas, efficient removal is necessary before the high-temperature flue gas enters the boiler. However, the efficient reaction between the dechlorinating agent and hydrogen chloride requires a suitable reaction temperature and good contact. Currently, there is no dedicated pretreatment device for cooling and dust removal of high-temperature flue gas from waste incineration. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a water-cooled dust removal device for high-temperature flue gas dechlorination in waste incineration power plants that is compact, highly stable, and has high cooling efficiency, in order to address the shortcomings of the existing technology.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A water-cooled dust removal device for high-temperature flue gas dechlorination in a waste incineration power plant includes: a cyclone separator and a dust removal flue; the upper part of the cyclone separator is provided with a high-temperature flue gas inlet for connection to the incinerator, and the bottom of the cyclone separator is provided with a fly ash outlet; one end of the dust removal flue penetrates through the top of the cyclone separator and extends into the cyclone separator, and the other end of the dust removal flue is provided with a high-temperature flue gas outlet; an annular water-cooling device is fitted on the outside of the cyclone separator, and a water-cooling coil is fitted on the part of the dust removal flue located on the outside of the cyclone separator; the high-temperature flue gas discharged from the incinerator enters the cyclone separator for gas-solid separation and primary cooling, and then enters the dust removal flue for secondary cooling before being discharged into the high-temperature flue gas dechlorination tower.

[0006] As a further improvement of this utility model, the annular water cooling device includes an inclined upper annular manifold and a horizontal lower annular manifold, with multiple water cooling tube bundles arranged in an annular array between the inclined upper annular manifold and the horizontal lower annular manifold.

[0007] As a further improvement of this utility model, the horizontal lower annular manifold is provided with a first water inlet on its side, and the inclined upper annular manifold is provided with a first water outlet at its highest point.

[0008] As a further improvement of this utility model, the high-temperature flue gas inlet is located above the lowest point of the inclined upper annular header and is tangentially connected to the cyclone separator.

[0009] As a further improvement of this utility model, connecting fins are provided between adjacent water-cooled tube bundles.

[0010] As a further improvement of this utility model, the water-cooled coil is provided with a second water inlet and a second water outlet, the second water inlet being close to the top of the cyclone separator and the second water outlet being close to the high-temperature flue gas outlet.

[0011] As a further improvement of this utility model, a temperature measuring device is provided in the high-temperature flue gas outlet. The temperature measuring device is connected to a remote controller. The remote controller controls the water flow rate of the first water inlet and the second water inlet according to the temperature signal fed back by the temperature measuring device.

[0012] As a further improvement of this utility model, the inner wall of the cyclone separator is provided with a second wear-resistant and fire-resistant layer, the outer wall of the cyclone separator is provided with a second heat insulation layer, and the annular water cooling device is located inside the second heat insulation layer.

[0013] As a further improvement of this utility model, a fire-resistant layer is provided on the inner wall of the dust removal flue, a first wear-resistant fire-resistant layer is provided on the outer wall of the dust removal flue located inside the cyclone separator, and a first heat insulation layer is provided on the outer wall of the dust removal flue located outside the cyclone separator.

[0014] As a further improvement of this utility model, the bottom of the cyclone separator is also provided with a slide valve and a double-layer flap valve; the flyback particles collected in the cyclone separator flow through the slide valve, the double-layer flap valve and the fly ash outlet in sequence before being discharged from the cyclone separator.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] This utility model discloses a water-cooled dust removal device for high-temperature flue gas dechlorination in waste incineration power plants. The main structure of the water-cooled dust removal device consists of a cyclone separator and a dust removal flue. The cyclone separator has a high-temperature flue gas inlet on its side, connecting to the incinerator, and a fly ash outlet at its bottom. The dust removal flue runs through the upper part of the cyclone separator and connects to the high-temperature flue gas dechlorination tower via the high-temperature flue gas outlet. Both the cyclone separator and the dust removal flue are equipped with water-cooling devices on their outer sides. The high-temperature flue gas discharged from the incinerator enters the cyclone separator for gas-solid separation and primary cooling. The cooled flue gas then enters the dust removal flue and undergoes secondary cooling before entering the high-temperature flue gas dechlorination tower. This ensures that the flue gas is cooled to the optimal reaction temperature required by the dechlorinating agent, improving the efficiency of flue gas dechlorination. Simultaneously, the two-stage water-cooling design avoids the situation where a single cooling device malfunctions, preventing the flue gas temperature from decreasing and severely impacting dechlorination efficiency, thus ensuring the reliability of the waste incineration system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structural principle of the water-cooled dust removal device in a specific embodiment of this utility model;

[0018] Figure 2 for Figure 1 Top view of the cross section along the AA direction;

[0019] Figure 3 This is a schematic diagram of the structural principle of the annular water-cooling device in a specific embodiment of this utility model;

[0020] Legend: 1. High-temperature flue gas inlet; 2. High-temperature flue gas outlet; 3. Cyclone separator; 4. Inclined upper annular header; 5. Horizontal lower annular header; 6. Water-cooled tube bundle; 7. First water inlet; 8. First water outlet; 9. Second water inlet; 10. Second water outlet; 11. Dust removal flue; 12. Refractory layer; 13. First wear-resistant refractory layer; 14. Water-cooled coil; 15. First insulation layer; 16. Temperature measuring device; 17. Slide valve; 18. Double-layer flap valve; 19. Fly ash outlet; 20. Second insulation layer; 21. Second wear-resistant refractory layer; 22. Connecting fins; 23. Annular water-cooling device. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0022] In the description of this utility model, it should be understood that the terms "side", "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0024] Example

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention relates to a water-cooled dust removal device for high-temperature flue gas dechlorination in a waste incineration power plant, comprising: a cyclone separator 3 and a dust removal flue 11. The upper part of the cyclone separator 3 is a cylindrical structure, and the lower part is a conical structure. The upper part of the cylindrical part of the cyclone separator 3 is provided with a high-temperature flue gas inlet 1, which connects to the incinerator. The bottom of the conical part of the cyclone separator 3 is provided with a fly ash outlet 19. One end of the dust removal flue 11 penetrates the top of the cyclone separator 3 and extends into the cyclone separator 3. The other end of the dust removal flue 11 is provided with a high-temperature flue gas outlet 2. An annular water-cooling device 23 is fitted on the outer side of the cylindrical part of the cyclone separator 3, and a water-cooling coil 14 is fitted on the portion of the dust removal flue 11 located on the outer side of the cyclone separator 3. The high-temperature flue gas discharged from the incinerator at around 750°C enters the cyclone separator 3 for gas-solid separation and primary cooling, and then enters the dust removal flue 11 for secondary cooling to obtain high-temperature flue gas at around 600°C. Finally, it is discharged into the high-temperature flue gas dechlorination tower to react with the dechlorination agent.

[0026] In this embodiment, the main structure of the water-cooled dust removal device consists of a cyclone separator 3 and a dust removal flue 11. The cyclone separator 3 has a high-temperature flue gas inlet 1 on its side, connecting to the incinerator. The bottom of the cyclone separator 3 has a fly ash outlet 19. The dust removal flue 11 runs through the upper part of the cyclone separator 3 and connects to the high-temperature flue gas dechlorination tower via a high-temperature flue gas outlet 2. Both the cyclone separator 3 and the dust removal flue 11 are equipped with water-cooling devices on their outer sides. The high-temperature flue gas discharged from the incinerator enters the cyclone separator 3 for gas-solid separation and primary cooling. The cooled flue gas then enters the dust removal flue 11, undergoes secondary cooling, and then enters the high-temperature flue gas dechlorination tower. This ensures that the flue gas is cooled to the optimal reaction temperature required by the dechlorinating agent, improving the efficiency of flue gas dechlorination. Simultaneously, the two-stage water-cooling design avoids the situation where a single cooling device malfunctions, preventing the flue gas temperature from decreasing and severely impacting the dechlorination efficiency, thus ensuring the reliability of the waste incineration system.

[0027] like Figure 1 As shown, the high-temperature flue gas inlet 1 is tangentially connected to the cyclone separator 3, bypassing the annular water cooling device 23. The flue gas enters the cyclone separator 3 tangentially through the high-temperature flue gas inlet 1, forming a cyclone in the cyclone separator 3. Fly ash particles hit the inner wall of the cyclone separator 3 and the outer wall of the dust removal flue 11 extending into the cyclone separator 3, causing the solid fly ash particles to separate from the gas. Under the action of gravity, the gas is discharged through the fly ash outlet 19. The flue gas after cyclone dust removal is discharged through the dust removal flue 11 and exits through the high-temperature flue gas outlet 2 to the high-temperature flue gas dechlorination tower.

[0028] like Figure 3 As shown, the annular water-cooling device 23 includes an inclined upper annular header 4 and a horizontal lower annular header 5. The horizontal lower annular header 5 is located at the bottom of the cylindrical section of the cyclone separator 3, and the inclined upper annular header 4 is located at the top of the cylindrical section of the cyclone separator 3. Multiple water-cooling tube bundles 6 are arranged in a ring array between the inclined upper annular header 4 and the horizontal lower annular header 5. Connecting fins 22 are provided between adjacent water-cooling tube bundles 6.

[0029] Furthermore, the horizontal lower annular header 5 is provided with a first water inlet 7 on its side, and the inclined upper annular header 4 is provided with a first water outlet 8 at its highest point. The high-temperature flue gas inlet 1 is located above the lowest point of the inclined upper annular header 4 and is tangentially connected to the cyclone separator 3.

[0030] In this embodiment, the annular water-cooling device 23 is equipped with an inclined upper annular header 4 and a horizontal lower annular header 5. The arrangement of the inclined upper annular header 4 allows the high-temperature flue gas inlet 1 to be connected to the cyclone separator 3 without passing through the annular water-cooling device 23, thereby simplifying the manufacturing and installation of the annular water-cooling device 23. Water-cooled tube bundles 6 are arranged in a ring array between the inclined upper annular header 4 and the horizontal lower annular header 5. Connecting fins 22 are provided between the water-cooled tube bundles 6, providing a large heat exchange area with the flue gas, which can efficiently absorb the heat of the flue gas and ensure that a relatively small device size can be adjusted to a large temperature range.

[0031] like Figure 1 As shown, the water-cooled coil 14 is provided with a second water inlet 9 and a second water outlet 10. The second water inlet 9 is close to the top of the cyclone separator 3, and the second water outlet 10 is close to the high-temperature flue gas outlet 2.

[0032] In this embodiment, the demineralized water enters the horizontal lower annular header 5 and the water-cooled coil 14 through the first inlet 7 and the second inlet 9, respectively. After exchanging heat with the flue gas, it is discharged to the deaerator through the first outlet 8 and the second outlet 10, respectively. The first outlet 8 is located at the highest point of the inclined upper annular header 4, which can avoid the presence of air bubbles that are difficult to discharge due to the horizontal arrangement of the upper annular header, which could cause local overheating of the header and damage to the equipment.

[0033] like Figure 1 As shown, a temperature measuring device 16 is installed inside the high-temperature flue gas outlet 2. The temperature measuring device 16 is connected to a remote controller. The flow rate of the demineralized water for cooling is positively correlated with the flue gas temperature at the high-temperature flue gas outlet 2. Based on the temperature signal fed back by the temperature measuring device 16, the remote controller controls the regulating valves on the first inlet 7 and the second inlet 9 to adjust the flow rate of the demineralized water for cooling. If the flue gas temperature measured by the temperature measuring device 16 is too high, the flow rate of the demineralized water is increased; if the flue gas temperature is too low, the flow rate of the demineralized water is decreased. In addition, the demineralized water in the water-cooled coil 14 and the annular water-cooling device 23 is always kept full to avoid local overheating and equipment damage.

[0034] like Figure 1 and Figure 2 As shown, in order to protect the cyclone separator 3 and the dust removal flue 11 and extend the service life of the equipment, a second wear-resistant and fire-resistant layer 21 is provided on the inner wall of the cyclone separator 3, a second heat insulation layer 20 is provided on the outer wall of the cyclone separator 3, and an annular water cooling device 23 is located inside the second heat insulation layer 20.

[0035] The inner wall of the dust removal flue 11 is provided with a fire-resistant layer 12, the outer wall of the dust removal flue 11 located inside the cyclone separator 3 is provided with a first wear-resistant fire-resistant layer 13, and the outer wall of the dust removal flue 11 located outside the cyclone separator 3 is provided with a first heat insulation layer 15.

[0036] like Figure 1As shown, the bottom of the cyclone separator 3 is also equipped with a slide gate valve 17 and a double-layer flap valve 18. The flyback particles collected in the cyclone separator 3 flow sequentially through the slide gate valve 17, the double-layer flap valve 18, and the fly ash outlet 19 before being discharged from the cyclone separator 3. The slide gate valve 17 is provided to facilitate the maintenance of the double-layer flap valve 18.

[0037] In this embodiment, a water-cooled dust removal device for high-temperature flue gas dechlorination in a waste incineration power plant is provided. This reduces the amount of fly ash entering the subsequent dechlorination reaction tower, which is beneficial for the contact reaction between the dechlorinating agent and the flue gas and avoids the large accumulation and caking of fly ash in the reaction tower, thus blocking the flue gas passage. At the same time, the water-cooled control of the high-temperature flue gas outlet temperature ensures that the reaction in the subsequent dechlorination reactor is in a suitable temperature range (550℃~650℃).

[0038] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A water-cooled dust removal device for high-temperature flue gas dechlorination in a waste incineration power plant, characterized in that, include: Cyclone separator (3) and dust removal flue (11); The upper part of the cyclone separator (3) is provided with a high-temperature flue gas inlet (1) to connect to the incinerator, and the bottom of the cyclone separator (3) is provided with a fly ash outlet (19); one end of the dust removal flue (11) passes through the top of the cyclone separator (3) and extends into the cyclone separator (3), and the other end of the dust removal flue (11) is provided with a high-temperature flue gas outlet (2); an annular water cooling device (23) is fitted on the outside of the cyclone separator (3), and a water cooling coil (14) is fitted on the part of the dust removal flue (11) located on the outside of the cyclone separator (3); the high-temperature flue gas discharged from the incinerator enters the cyclone separator (3) for gas-solid separation and primary cooling, and then enters the dust removal flue (11) for secondary cooling before being discharged into the high-temperature flue gas dechlorination tower.

2. The water-cooled dust removal device for high-temperature flue gas dechlorination in waste incineration power plants according to claim 1, characterized in that, The annular water cooling device (23) includes an inclined upper annular header (4) and a horizontal lower annular header (5), with multiple water cooling tube bundles (6) arranged in an annular array between the inclined upper annular header (4) and the horizontal lower annular header (5).

3. The water-cooled dust removal device for high-temperature flue gas dechlorination in waste incineration power plants according to claim 2, characterized in that, The horizontal lower annular manifold (5) is provided with a first water inlet (7) on its side, and the inclined upper annular manifold (4) is provided with a first water outlet (8) at its highest point.

4. The water-cooled dust removal device for high-temperature flue gas dechlorination in waste incineration power plants according to claim 3, characterized in that, The high-temperature flue gas inlet (1) is located above the lowest point of the inclined upper annular header (4) and is tangentially connected to the cyclone separator (3).

5. The water-cooled dust removal device for high-temperature flue gas dechlorination in waste incineration power plants according to claim 2, characterized in that, Connecting fins (22) are provided between adjacent water-cooled tube bundles (6).

6. The water-cooled dust removal device for high-temperature flue gas dechlorination in waste incineration power plants according to claim 3, characterized in that, The water-cooled coil (14) is provided with a second water inlet (9) and a second water outlet (10). The second water inlet (9) is close to the top of the cyclone separator (3), and the second water outlet (10) is close to the high-temperature flue gas outlet (2).

7. The water-cooled dust removal device for high-temperature flue gas dechlorination in waste incineration power plants according to claim 6, characterized in that, A temperature measuring device (16) is provided inside the high-temperature flue gas outlet (2). The temperature measuring device (16) is connected to a remote controller. The remote controller controls the water flow rate of the first water inlet (7) and the second water inlet (9) according to the temperature signal fed back by the temperature measuring device (16).

8. The water-cooled dust removal device for high-temperature flue gas dechlorination in waste incineration power plants according to any one of claims 1 to 7, characterized in that, The inner wall of the cyclone separator (3) is provided with a second wear-resistant and fire-resistant layer (21), the outer wall of the cyclone separator (3) is provided with a second heat insulation layer (20), and the annular water cooling device (23) is located inside the second heat insulation layer (20).

9. The water-cooled dust removal device for high-temperature flue gas dechlorination in waste incineration power plants according to any one of claims 1 to 7, characterized in that, The inner wall of the dust removal flue (11) is provided with a fire-resistant layer (12), the outer wall of the dust removal flue (11) located inside the cyclone separator (3) is provided with a first wear-resistant fire-resistant layer (13), and the outer wall of the dust removal flue (11) located outside the cyclone separator (3) is provided with a first heat insulation layer (15).

10. The water-cooled dust removal device for high-temperature flue gas dechlorination in waste incineration power plants according to any one of claims 1 to 7, characterized in that, The bottom of the cyclone separator (3) is also provided with a slide valve (17) and a double-layer flap valve (18); the flyback particles collected in the cyclone separator (3) flow through the slide valve (17), the double-layer flap valve (18) and the fly ash outlet (19) in sequence before being discharged from the cyclone separator (3).

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