Integrated device for cooling and quenching waste incineration flue gas

Abstract

The present invention relates to an integrated device for cooling and quenching waste incineration flue gas, comprising a first furnace body, a second furnace body with a reduced diameter connected thereto, a furnace body inlet at the bottom thereof, and a flow guide baffle arranged in the first furnace body below the furnace body inlet; and also comprising a closely spaced coil, the structure of which comprises a first coil attached to the inner wall of the first furnace body, circumferentially surrounding and axially extending and closely arranged in a spiral manner, and a second coil and a third coil connected thereto and arranged in the same manner are arranged in sequence in the inner circle, and a flue gas flow channel is formed between the first coil and the second coil, and between the second coil and the third coil; the third coil is closely attached to the outer wall of the second furnace body, and a quenching water spray pipe is arranged between the second coil and the third coil, and the two sides of the pipe wall are close to the pipe walls of the second coil and the third coil respectively. The present invention greatly improves the heat exchange effect of the heat exchange section, reduces the fire resistance and high temperature resistance requirements of the materials of the heat exchange section and the quenching section, and improves the operation reliability.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature incineration flue gas cooling, and in particular to an integrated device for cooling and quenching waste incineration flue gas. Background Art

[0002] Whether it is solid waste, liquid waste, or gaseous waste, a certain amount of dioxin will be generated during the incineration process. In the process of utilizing the heat energy of the incineration flue gas, it is generally adopted to first perform heat exchange at a high temperature to absorb the waste heat of the flue gas and generate steam or hot water. When it drops to no less than 600°C, it is quickly cooled to avoid the regeneration of dioxins that have been decomposed at high temperature. The rapid cooling methods include flue gas recirculation or water spraying. Since the temperature of the incineration flue gas is very high, the inlet temperature can usually reach 1100°C, and it has a complex phase composition. At the same time, it is affected by the heat exchange area and heat exchange efficiency. Therefore, the materials used in the cooling device have high requirements for high temperature resistance and corrosion resistance. The furnace wall, quenching water pipe, etc. need to use high-grade heat-resistant stainless steel, and the heat exchange pipe section under high temperature needs to use refractory materials, which makes the entire cooling device heavy and reduces reliability after long-term use. Summary of the invention

[0003] In view of the shortcomings in the above-mentioned existing production technologies, the applicant provides a rationally structured integrated device for cooling and quenching waste incineration flue gas, rationally designs the structure of the high-temperature heat exchange section, increases the heat exchange area, improves the heat exchange efficiency, eliminates the need to use high-grade heat-resistant stainless steel and refractory materials, reduces weight and improves reliability.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A waste incineration flue gas cooling and rapid cooling integrated device, comprising a first furnace body, a high-temperature incineration flue gas inlet is provided at the bottom of the first furnace body, a second furnace body with a reduced diameter connected thereto is provided in the middle of the first furnace body, a low-temperature incineration flue gas outlet after cooling is provided at the top, a furnace body inlet is provided at the bottom, and a guide baffle is provided in the first furnace body below the furnace body inlet; it also comprises a closely spaced coil, which is located between the inner wall of the first furnace body and the outer wall of the second furnace body, and the structure comprises a first coil attached to the inner wall of the first furnace body, circumferentially surrounding and axially extending in a spiral manner and arranged closely, the inner circle of the first coil is sequentially provided with a second coil and a third coil connected thereto and arranged in the same manner, and a flue gas flow channel is formed between the first coil and the second coil, and between the second coil and the third coil; the third coil is attached to the outer wall of the second furnace body, circumferentially surrounding and axially extending in a spiral manner and arranged closely.

[0006] As a further improvement of the above technical solution:

[0007] The bottom joint of the third coil is connected to the cooling medium inlet pipe, and the top joint of the first coil is connected to the cooling medium outlet pipe.

[0008] It also includes a quenching water spray pipe, which is arranged in the smoke flow channel formed between the second coil and the third coil, and the two sides of the pipe wall are close to the pipe walls of the second coil and the third coil respectively.

[0009] The quenching water spray pipe penetrates from the top of the first furnace body, and the external quenching water spray flows in from the upstream input port. The bottom of the quenching water spray pipe is bent and extends to the furnace body inlet, and a cooling water nozzle is installed at the end.

[0010] The second coil is fixed between the first coil and the third coil by a bracket, and the bottom of the second coil is attached to the outer circle of the guide baffle, and the top height is lower than the height of the first coil and the third coil.

[0011] The guide baffle is arranged horizontally, with its bottom facing the high-temperature incineration flue gas inlet, to guide the incoming high-temperature incineration flue gas so that it flows from the bottom into the channel formed between the first coil and the second coil, then flows from the top into the channel formed between the second coil and the third coil, then flows from the furnace body inlet into the second furnace body, and finally flows out from the low-temperature incineration flue gas outlet.

[0012] The furnace body inlet section at the bottom of the second furnace body is configured as a Venturi tube structure with a constricted section.

[0013] A heat-insulating interlayer is arranged in the outer wall of the first furnace body.

[0014] The beneficial effects of the present invention are as follows:

[0015] The present invention has a reasonable structure, greatly improves the heat exchange effect of the heat exchange section (coil assembly and the first furnace body), reduces the fire and high temperature resistance requirements of the heat exchange section and the quenching section (quenching water spray pipe and the second furnace body), and greatly improves the operation reliability.

[0016] The high-temperature incineration flue gas first undergoes preliminary heat exchange through the coil assembly, and then is rapidly cooled using a rapid cooling water spray pipe. The first coil, the second coil, and the third coil are sequentially connected, closely arranged along the axial spiral and spaced apart along the radial direction, which greatly improves the heat exchange effect of the heat exchange section. The first coil and the third coil are respectively attached to the outer wall of the first furnace body and the outer wall of the second furnace body, which have a good cooling effect, avoid the use of high-grade heat-resistant stainless steel and refractory materials for the coil assembly and the furnace wall of the heat exchange section, reduce the weight of the equipment, and improve the reliability of long-term operation.

[0017] The present invention also has the following advantages:

[0018] The guide baffle is arranged horizontally, and the bottom surface is aligned with the high-temperature incineration flue gas inlet, so as to guide the high-temperature incineration flue gas flowing in from the bottom, so that it flows into the channel formed between the first coil and the second coil from the bottom, and then flows into the channel formed between the second coil and the third coil from the top, and then flows into the second furnace body 2 from the furnace body inlet, and finally flows out from the low-temperature incineration flue gas outlet. The above structure allows the flue gas to flow along the axial direction through an S-shaped bending path, which greatly increases the heat exchange area with the coil assembly;

[0019] Cooling water or other cooling medium is introduced into the quenching water spray pipe, and a cooling water nozzle is installed at the end extending to the position inside the furnace body inlet. The cooling water can be sprayed into the second furnace body by the cooling water nozzle in the form of pressure atomization to perform secondary quenching heat exchange and cooling. The furnace body inlet section at the bottom of the second furnace body is configured as a Venturi tube structure with a constricted section, which is conducive to uniform and rapid mixing of the sprayed cooling water and the flue gas, so that the flue gas is quickly and evenly cooled;

[0020] The quenching water spray pipe is arranged in the flue gas flow channel formed between the second coil and the third coil, and the two sides of the pipe wall are close to the pipe walls of the second coil and the third coil respectively, or arranged to be close to each other as needed. Thus, the temperature of the pipe wall of the quenching water spray pipe is greatly reduced, the use of high-grade heat-resistant stainless steel is avoided, and the reliability of the device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Among them: 1. The first furnace body; 2. The second furnace body; 3. Closely packed coils; 4. Rapid cooling water spray pipe; 5. Cooling medium inlet pipe; 6. Guide baffle; 7. Insulation interlayer; 8. Cooling medium outlet pipe; 9. High-temperature incineration flue gas inlet; 10. Low-temperature incineration flue gas outlet; 21. Furnace body inlet; 31. The first coil; 32. The second coil; 33. The third coil; 41. Cooling water nozzle. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0024] like Figure 1 As shown, the waste incineration flue gas cooling and rapid cooling integrated device of this embodiment comprises a first furnace body 1, a high-temperature incineration flue gas inlet 9 is provided at the bottom of the first furnace body 1, a second furnace body 2 with a reduced diameter connected thereto is provided in the middle of the first furnace body 1, a low-temperature incineration flue gas outlet 10 after cooling is provided at the top of the first furnace body 1, a furnace body inlet 21 is provided at the bottom, and a guide baffle 6 is provided in the first furnace body 1 below the furnace body inlet 21;

[0025] It also includes a closely packed coil 3, which is located between the inner wall of the first furnace body 1 and the outer wall of the second furnace body 2, and has a structure comprising a first coil 31 attached to the inner wall of the first furnace body 1, circumferentially surrounding and axially extending in a spiral manner and closely arranged, the inner circle of the first coil 31 is sequentially spaced with a second coil 32 and a third coil 33 which are connected thereto and arranged in the same manner, and a flue gas flow channel is formed between the first coil 33 and the second coil 32, and between the second coil 32 and the third coil 33; the third coil 33 is attached to the outer wall of the second furnace body 2, circumferentially surrounding and axially extending in a spiral manner and closely arranged.

[0026] The bottom joint of the third coil 31 is connected to the cooling medium inlet pipe 5 , and the top joint of the first coil 31 is connected to the cooling medium outlet pipe 8 .

[0027] It also includes a quenching water spray pipe 4, which is arranged in the smoke flow channel formed between the second coil 32 and the third coil 33, and the two sides of the pipe wall are close to the pipe walls of the second coil 32 and the third coil 33 respectively, or are arranged in a close contact with each other as needed.

[0028] The quenching water spray pipe 4 penetrates from the top of the first furnace body 1, and the external quenching water spray flows in from its upstream input port, and bends at the bottom to extend into the furnace body inlet 21. A cooling water nozzle 41 is installed at the end of the quenching water spray pipe 4 extending into the furnace body inlet 21.

[0029] The second coil 32 is fixed between the first coil 31 and the third coil 33 by a bracket, and the bottom of the second coil 32 is attached to the outer circle of the guide baffle 6, and the top height is lower than the height of the first coil 31 and the third coil 33.

[0030] The furnace inlet 21 section at the bottom of the second furnace body 2 is configured as a Venturi tube structure with a constricted section.

[0031] A heat-insulating interlayer 7 is provided in the outer wall of the first furnace body 1 .

[0032] like Figure 1 As shown by the arrows, it is the flow direction of each medium during the operation of the integrated waste incineration flue gas cooling and rapid cooling device of this embodiment.

[0033] The guide baffle 6 is arranged horizontally, and the bottom surface is aligned with the high-temperature incineration flue gas inlet 9, which guides the high-temperature incineration flue gas flowing in from the bottom, so that it flows from the bottom into the channel formed between the first coil 31 and the second coil 32, and then flows from the top into the channel formed between the second coil 32 and the third coil 33, and then flows from the furnace inlet 21 into the second furnace body 2, and finally flows out from the low-temperature incineration flue gas outlet 10; the arrows in the first furnace body 1 and the second furnace body 2 are the flow direction of the flue gas, and the flue gas flows along the axial direction through an S-shaped bending path, which greatly increases the heat exchange area with the coil assembly 3, wherein the bottom joint of the third coil 31 is connected to the cooling medium inlet pipe 5, and the top joint of the first coil 31 is connected to the cooling medium outlet pipe 8, and the medium in the pipe can be hot water, steam or heat transfer oil, etc.; after heat exchange through the coil assembly 3, under specific working conditions, the flue gas temperature can be reduced from about 1100°C at the high-temperature incineration flue gas inlet 9 to about 700°C;

[0034] Cooling water or other cooling medium is introduced into the quenching water spray pipe 4, and a cooling water nozzle 41 is installed at the end extending to the position inside the furnace inlet 21. The cooling water can be sprayed into the second furnace body 2 by the cooling water nozzle 41 in a pressure atomization manner to perform secondary quenching heat exchange and cooling. The furnace inlet 21 section at the bottom of the second furnace body 2 is configured as a Venturi tube structure with a constricted section, which is conducive to uniform and rapid mixing of the sprayed cooling water and the flue gas, so that the flue gas is quickly and evenly cooled, and the flue gas temperature continues to drop to about 200°C at the low-temperature incineration flue gas outlet 10;

[0035] The quenching water spray pipe 4 is arranged in the flue gas flow channel formed between the second coil 32 and the third coil 33, and the two sides of the pipe wall are respectively close to the pipe walls of the second coil 32 and the third coil 33 or arranged to be close to each other as required. Thus, the temperature of the pipe wall of the quenching water spray pipe 4 is greatly reduced, the use of high-grade heat-resistant stainless steel is avoided, and the reliability of the device is improved.

[0036] In this embodiment, the first coil 31, the second coil 32 and the third coil 33 are connected in sequence, and are closely arranged along the axial spiral and spaced apart along the radial direction, which greatly improves the heat exchange effect of the heat exchange section, avoids the use of high-grade heat-resistant stainless steel and refractory materials in the coil assembly 3, reduces the weight of the equipment, and improves the reliability of long-term operation.

[0037] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. An integrated device for cooling and quenching waste incineration flue gas, characterized in that: It comprises a first furnace body (1), a high-temperature combustion flue gas inlet (9) being provided at the bottom thereof, a second furnace body (2) of reduced diameter being provided in the middle of the first furnace body (1) and being connected thereto, a low-temperature combustion flue gas outlet (10) being provided at the top thereof after cooling, a furnace body inlet (21) being provided at the bottom thereof, and a guide baffle (6) being provided in the first furnace body (1) below the furnace body inlet (21); It also includes a closely spaced coil (3), which is located between the inner wall of the first furnace body (1) and the outer wall of the second furnace body (2), and comprises a first coil (31) attached to the inner wall of the first furnace body (1), surrounding in the circumferential direction and extending in a spiral manner in the axial direction and closely arranged, the inner circle of the first coil (31) is provided with a second coil (32) and a third coil (33) which are connected to the first coil (31) and arranged in the same manner, and a flue gas flow channel is formed between the first coil (31) and the second coil (32), and between the second coil (32) and the third coil (33); the third coil (33) is attached to the outer wall of the second furnace body (2), surrounding in the circumferential direction and extending in a spiral manner in the axial direction and closely arranged; It also includes a quenching water spray pipe (4), which is arranged in the smoke flow channel formed between the second coil pipe (32) and the third coil pipe (33), and the two sides of the pipe wall are close to the pipe walls of the second coil pipe (32) and the third coil pipe (33); The quenching water spray pipe (4) penetrates from the top of the first furnace body (1), and external quenching water spray flows in from the upstream input port. The bottom of the quenching water spray pipe (4) is bent and extends into the furnace body inlet (21), and a cooling water nozzle (41) is installed at the end; The guide baffle (6) is arranged horizontally, with its bottom surface facing the high-temperature incineration flue gas inlet (9), and guides the incoming high-temperature incineration flue gas so that it flows from the bottom into the channel formed between the first coil (31) and the second coil (32), then flows from the top into the channel formed between the second coil (32) and the third coil (33), then flows from the furnace body inlet (21) into the second furnace body (2), and finally flows out from the low-temperature incineration flue gas outlet (10); The furnace inlet (21) section at the bottom of the second furnace body (2) is configured as a Venturi tube structure having a constricted section.

2. The integrated device for cooling and quenching waste incineration flue gas according to claim 1, characterized in that: The bottom joint of the third coil (33) is connected to the cooling medium inlet pipe (5), and the top joint of the first coil (31) is connected to the cooling medium outlet pipe (8).

3. The integrated device for cooling and quenching waste incineration flue gas according to claim 1, characterized in that: The second coil (32) is fixed between the first coil (31) and the third coil (33) by a bracket, and the bottom of the second coil (32) is attached to the outer ring of the guide baffle (6), and the top height is lower than the height of the first coil (31) and the third coil (33).

4. The integrated device for cooling and quenching waste incineration flue gas according to claim 1, characterized in that: A heat-insulating interlayer (7) is provided in the outer wall of the first furnace body (1).

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