CN112594704A - Secondary combustion chamber for hazardous waste incineration treatment - Google Patents

Secondary combustion chamber for hazardous waste incineration treatment Download PDF

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Publication number
CN112594704A
CN112594704A CN202011623410.3A CN202011623410A CN112594704A CN 112594704 A CN112594704 A CN 112594704A CN 202011623410 A CN202011623410 A CN 202011623410A CN 112594704 A CN112594704 A CN 112594704A
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CN
China
Prior art keywords
cylinder
combustion chamber
inner cylinder
secondary combustion
hazardous waste
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011623410.3A
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Chinese (zh)
Inventor
杨肇博
李斌
韩杨
吕金玲
刘增
徐钟川
申强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Acre Coking and Refractory Engineering Consulting Corp MCC
Original Assignee
Acre Coking and Refractory Engineering Consulting Corp MCC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Acre Coking and Refractory Engineering Consulting Corp MCC filed Critical Acre Coking and Refractory Engineering Consulting Corp MCC
Priority to CN202011623410.3A priority Critical patent/CN112594704A/en
Publication of CN112594704A publication Critical patent/CN112594704A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
    • F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/32—Incineration of waste; Incinerator constructions; Details, accessories or control therefor the waste being subjected to a whirling movement, e.g. cyclonic incinerators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/027—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Incineration Of Waste (AREA)

Abstract

The invention relates to a secondary combustion chamber for incineration treatment of hazardous wastes, which comprises an inner cylinder, an outer cylinder, a top cover, a slag outlet, a flow guide partition plate, a rotary kiln access pipe, a combustor access pipe, an SNCR nozzle and a water tank. The beneficial effects are as follows: the device adopts a conventional SNCR reaction denitration device, can ensure that the denitration efficiency reaches 85 percent, has low operation cost, high adaptability, small occupied area and low equipment height, has certain dust removal effect, saves energy by 3 percent compared with the conventional project, has good sealing performance, is simple and easy to implement, has low investment cost, is suitable for the flue gas treatment of the incineration of hazardous wastes, and is particularly suitable for the flue gas treatment of the rotary kiln incineration of the hazardous wastes with higher concentration of nitrogen oxides and higher dust content emission.

Description

Secondary combustion chamber for hazardous waste incineration treatment
Technical Field
The invention relates to the technical field of hazardous waste incineration treatment, in particular to a secondary combustion chamber for hazardous waste incineration treatment.
Background
In the process of burning and treating hazardous wastes, if a large amount of NOx is generated when high-nitro compounds are burned, if a conventional SNCR denitration method is adopted, because the denitration efficiency can only reach about 40 percent, the smoke can not reach the emission standard, SCR denitration is required to meet the smoke emission requirement. However, the existing SCR mainly uses a low-temperature SCR method and is installed at the rear of wet desulfurization. The construction cost and the operation cost of the SCR are far higher than those of an SNCR denitration reaction device, and meanwhile, the construction of the SCR needs to occupy a larger field.
The secondary combustion chamber is a common device for burning and treating hazardous wastes, and because the internal temperature of the secondary combustion chamber is as high as 1100 ℃ and the external temperature is as low as 20-30 ℃, a large temperature difference inevitably brings certain heat loss, and the consistent pursuit in the industry is to reduce the heat loss and save energy.
For a conventional secondary combustion chamber, due to the influence of outlet temperature drop, ash deposition is easily generated on a straight pipeline connected with a waste heat boiler, shutdown maintenance of a production line is often brought, and operation cost is increased, so that the secondary combustion chamber is an industrial problem and is an important work to be solved urgently in the industry.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention solves the technical problem of providing the secondary combustion chamber for the incineration treatment of the hazardous waste, adopts a conventional SNCR reaction denitration device, can ensure that the denitration efficiency reaches 85 percent, has low operation cost, high adaptability, small occupied area, low equipment height and certain dust removal effect, saves energy by 3 percent compared with the conventional project, has good sealing performance, is simple and easy to implement, has low investment cost, is suitable for the flue gas treatment of the incineration of the hazardous waste, and is particularly suitable for the flue gas treatment of the rotary kiln incineration of the hazardous waste with higher concentration of nitrogen oxide and higher dust content emission.
In order to achieve the purpose, the invention adopts the following technical scheme:
a secondary combustion chamber for hazardous waste incineration treatment comprises an inner cylinder, an outer cylinder, a top cover, a slag hole, a flow guide partition plate, a rotary kiln access pipe, a burner access pipe, an SNCR nozzle and a water tank, and is characterized in that the inner cylinder is sleeved in the outer cylinder, the top cover is buckled at the upper ends of the inner cylinder and the outer cylinder, the slag hole is arranged at the lower ends of the inner cylinder and the outer cylinder, the inner cylinder and the outer cylinder are divided into two areas, the center of the inner cylinder is a combustion area, and a cyclone separation and denitration reaction area is arranged between the inner cylinder and the outer cylinder; the rotary kiln access pipe penetrates through the outer cylinder and is communicated with the inner cylinder, and the upper part of the inner cylinder is provided with an inner air outlet communicated with the cyclone separation and denitration reaction zone; the flow guide partition plate is arranged at the position, close to the inner air outlet, of the upper part of the cyclone separation and denitration reaction zone and is connected with the outer wall of the inner barrel and the inner wall of the outer barrel; an outer air outlet is arranged on the top cover, close to the flow guide partition plate and far away from one side of the inner air outlet, at the upper part of the cyclone separation and denitration reaction zone, an emergency discharge chimney is arranged in the center of the top cover, and the emergency discharge chimney is communicated with the inner cylinder and the outer air outlet; the number of the SNCR nozzles is a plurality of SNCR nozzles, the SNCR nozzles face the inner air outlet and are arranged on an outer barrel which is positioned at the upstream 300-600 mm of flue gas flow of the inner air outlet, a flue gas temperature measuring point is arranged on the outer barrel above the SNCR nozzles, and the temperature is 1100 ℃; the combustor access pipe is communicated with the inner cylinder and the outer cylinder respectively; the water tank is arranged below the slag outlet.
The slag hole is a reducing double-layer sleeve structure eccentric in the direction of the rotary kiln access pipe, the upper end of the slag hole is connected with the inner cylinder and the outer cylinder, and the lower end of the slag hole is immersed in water in the water tank.
The upper part of the water tank is provided with a water inlet, the lower part of the water tank is provided with a water outlet, the water tank is also provided with a water temperature measuring point, and the water temperature in the water tank is controlled to be not higher than 60 ℃.
The inner cylinder and the outer cylinder are both of cylindrical structures, all of which are built by refractory bricks, and the outer wall of the inner cylinder and the inner wall of the outer cylinder, namely the inner wall of the cyclone separation and denitration reaction area, are rough inner walls.
And a heat insulation material is laid outside the outer barrel, and the temperature of the outer wall is controlled to be less than 50 ℃.
The diversion baffle is sprayed by adopting wear-resistant castable.
The combustor access pipe is made of heat-resistant steel, and the outer wall of the combustor access pipe is coated with a heat-insulating material and sprayed with a refractory castable.
The rotary kiln access pipe is built by refractory bricks.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention can adopt a conventional SNCR reaction denitration device, and the denitration efficiency can reach 85%;
2) the invention has low operation cost due to the application of the conventional SNCR reaction device;
3) compared with an independent secondary combustion chamber and a cyclone separator, the invention has small floor area, and compared with the traditional independent secondary combustion chamber, the invention has low building height and relatively low construction cost;
4) the invention has cyclone and inertia double dust removal performance and high dust removal efficiency;
5) the invention solves the problem of ash accumulation of the horizontal flue at the outlet of the second combustion chamber;
6) the invention has excellent sealing performance;
7) the invention has obvious energy-saving effect, saves the energy consumption of the secondary combustion chamber by more than 3 percent, and improves the gas production of the waste heat boiler.
Drawings
Fig. 1 is a schematic diagram of the three-dimensional structure of the present invention.
In the figure: 1-inner cylinder 2-outer cylinder 3-top cover 4-slag hole 5-smoke temperature measuring point 6-outer air outlet 7-emergency discharge chimney 8-inner air outlet 9-diversion clapboard 10-rotary kiln access pipe 11-combustor access pipe 12-SNCR spout 13-ventilation beam 14-water tank 141-water inlet 142-water outlet 143-water temperature measuring point
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in fig. 1, the secondary combustion chamber for incineration treatment of hazardous waste comprises an inner cylinder 1, an outer cylinder 2, a top cover 3, a slag hole 4, a flow guide partition plate 9, a rotary kiln access pipe 10, a burner access pipe 11, an SNCR nozzle 12 and a water tank 14, wherein the inner cylinder 1 is sleeved in the outer cylinder 2, the top cover 3 is buckled at the upper ends of the inner cylinder 1 and the outer cylinder 2, the slag hole 4 is arranged at the lower ends of the inner cylinder 1 and the outer cylinder 2, the inner cylinder 1 and the outer cylinder 2 are divided into two areas, the center of the inner cylinder 1 is a combustion area, and a cyclone separation and denitration reaction area is arranged between the inner cylinder 1 and the outer cylinder 2; the rotary kiln access pipe 10 penetrates through the outer cylinder 2 to be communicated with the inner cylinder 1 (the connection mode is rigid and closed, and no air can cross between the inner cylinder 1 and the outer cylinder 2), and the upper part of the inner cylinder 1 is provided with an inner air outlet 8 communicated with the cyclone separation and denitration reaction zone; the flow guide partition plate 9 is arranged at the position, close to the inner air outlet 8, of the upper part of the cyclone separation and denitration reaction zone and is connected with the outer wall of the inner barrel 1 and the inner wall of the outer barrel 2; an outer air outlet 6 is arranged on the top cover 3, which is close to the flow guide partition plate 9 and far away from the inner air outlet 8, at the upper part of the cyclone separation and denitration reaction zone, an emergency discharge chimney 7 is arranged at the center of the top cover 3, and the emergency discharge chimney 7 is communicated with the inner cylinder 1 and the outer air outlet 6; the number of the SNCR nozzles 12 is a plurality, the SNCR nozzles face the inner air outlet 8, the SNCR nozzles are arranged on the outer barrel 1 which is positioned at the upstream 300-600 mm of flue gas flow of the inner air outlet 8, a flue gas temperature measuring point 5 is arranged on the outer barrel 1 above the SNCR nozzles 12, and the temperature is 1100 ℃; the combustor access pipe 11 is communicated with the inner cylinder 1 and the outer cylinder 2 respectively, the connection mode is rigid and closed, and no gas is communicated between the inner cylinder 1 and the outer cylinder 2; the water tank 14 is arranged below the slag outlet 4.
The slag hole 4 is of an eccentric reducing double-layer sleeve structure, is eccentric in the direction of the rotary kiln access pipe 10, the upper end of the slag hole is connected with the inner cylinder 1 and the outer cylinder 2, and the lower end of the slag hole is immersed in water in the water tank 14, so that water sealing is realized.
The upper part of the water tank 14 is provided with a water inlet 141, the lower part of the water tank 14 is provided with a water outlet 142, the water tank 14 is also provided with a water temperature measuring point 143, and the water temperature in the water tank 14 is controlled not to be higher than 60 ℃.
The inner cylinder 1 and the outer cylinder 2 are both of cylindrical structures, all of which are built by refractory bricks, and the outer wall of the inner cylinder 1 and the inner wall of the outer cylinder 2, namely the inner wall of the cyclone separation and denitration reaction area, are rough inner walls.
And a heat insulation material is laid outside the outer barrel 2, and the temperature of the outer wall is controlled to be less than 50 ℃.
The diversion baffle plate 9 is sprayed by adopting wear-resistant castable.
The combustor access pipe 11 is made of heat-resistant steel, and the outer wall of the combustor access pipe is coated with a heat-insulating material and sprayed with a refractory castable.
The rotary kiln connecting pipe 10 is made of refractory bricks.
The device is located on a ventilation beam 13 of a steel structure, and the steel structure is externally coated with refractory materials.
During operation, flue gas from the rotary kiln enters the inner barrel 1 from the rotary kiln access pipe 10, is sprayed by the burner access pipe 11, is combusted and heated, slag blocks fall under the action of gravity and are discharged from the slag outlet 4, the flue gas flows upwards along the central combustion area (the arrow direction of a solid line in fig. 1), enters the cyclone separation and denitration reaction area from the inner air outlet 8, reacts with the SNCR denitration agent from the SNCR nozzle 12, the slag blocks fall under the action of gravity and are discharged from the slag outlet 4, and the purified flue gas flows upwards along the spiral of the cyclone separation and denitration reaction area (the arrow direction of a dotted line in fig. 1) and is discharged from the outer air outlet 6.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (8)

1. A secondary combustion chamber for hazardous waste incineration treatment comprises an inner cylinder, an outer cylinder, a top cover, a slag hole, a flow guide partition plate, a rotary kiln access pipe, a burner access pipe, an SNCR nozzle and a water tank, and is characterized in that the inner cylinder is sleeved in the outer cylinder, the top cover is buckled at the upper ends of the inner cylinder and the outer cylinder, the slag hole is arranged at the lower ends of the inner cylinder and the outer cylinder, the inner cylinder and the outer cylinder are divided into two areas, the center of the inner cylinder is a combustion area, and a cyclone separation and denitration reaction area is arranged between the inner cylinder and the outer cylinder; the rotary kiln access pipe penetrates through the outer cylinder and is communicated with the inner cylinder, and the upper part of the inner cylinder is provided with an inner air outlet communicated with the cyclone separation and denitration reaction zone; the flow guide partition plate is arranged at the position, close to the inner air outlet, of the upper part of the cyclone separation and denitration reaction zone and is connected with the outer wall of the inner barrel and the inner wall of the outer barrel; an outer air outlet is arranged on the top cover, close to the flow guide partition plate and far away from one side of the inner air outlet, at the upper part of the cyclone separation and denitration reaction zone, an emergency discharge chimney is arranged in the center of the top cover, and the emergency discharge chimney is communicated with the inner cylinder and the outer air outlet; the number of the SNCR nozzles is a plurality of SNCR nozzles, the SNCR nozzles face the inner air outlet and are arranged on an outer barrel which is positioned at the upstream 300-600 mm of flue gas flow of the inner air outlet, a flue gas temperature measuring point is arranged on the outer barrel above the SNCR nozzles, and the temperature is 1100 ℃; the combustor access pipe is communicated with the inner cylinder and the outer cylinder respectively; the water tank is arranged below the slag outlet.
2. The secondary combustion chamber for incineration disposal of hazardous waste as claimed in claim 1, wherein said slag outlet is a reducing double-layer sleeve structure eccentric to the rotary kiln in the direction of the inlet pipe, the upper end is connected to the inner and outer cylinders, and the lower end is immersed in the water tank.
3. The secondary combustion chamber for incineration disposal of hazardous waste as set forth in claim 1, wherein the water tank is provided with a water inlet at an upper portion thereof and a water outlet at a lower portion thereof, and a water temperature measuring point for controlling a temperature of water in the water tank to be not higher than 60 ℃.
4. The secondary combustion chamber for incineration disposal of hazardous waste according to claim 1, wherein the inner and outer cylinders are of a cylindrical structure, all of which are made of refractory bricks, and the outer wall of the inner cylinder and the inner wall of the outer cylinder, i.e., the inner wall of the cyclone and denitration reaction zone, are rough inner walls.
5. The secondary combustion chamber for incineration disposal of hazardous waste as set forth in claim 1, wherein an insulation material is applied to an outside of the outer cylinder, and an outer wall temperature is controlled to be less than 50 ℃.
6. The secondary combustion chamber for incineration disposal of hazardous waste of claim 1, wherein said baffle plate is sprayed with a wear resistant castable.
7. The secondary combustion chamber for incineration disposal of hazardous waste according to claim 1, wherein the burner inlet pipe is made of heat-resistant steel, and the outer wall is coated with a thermal insulation material and sprayed with a refractory castable.
8. The secondary combustion chamber for hazardous waste incineration disposal as claimed in claim 1, wherein said rotary kiln inlet pipe is constructed of refractory bricks.
CN202011623410.3A 2020-12-30 2020-12-30 Secondary combustion chamber for hazardous waste incineration treatment Pending CN112594704A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011623410.3A CN112594704A (en) 2020-12-30 2020-12-30 Secondary combustion chamber for hazardous waste incineration treatment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011623410.3A CN112594704A (en) 2020-12-30 2020-12-30 Secondary combustion chamber for hazardous waste incineration treatment

Publications (1)

Publication Number Publication Date
CN112594704A true CN112594704A (en) 2021-04-02

Family

ID=75206448

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011623410.3A Pending CN112594704A (en) 2020-12-30 2020-12-30 Secondary combustion chamber for hazardous waste incineration treatment

Country Status (1)

Country Link
CN (1) CN112594704A (en)

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