CN112460566A - Secondary air heating system of garbage incinerator - Google Patents
Secondary air heating system of garbage incinerator Download PDFInfo
- Publication number
- CN112460566A CN112460566A CN202011429409.7A CN202011429409A CN112460566A CN 112460566 A CN112460566 A CN 112460566A CN 202011429409 A CN202011429409 A CN 202011429409A CN 112460566 A CN112460566 A CN 112460566A
- Authority
- CN
- China
- Prior art keywords
- secondary air
- heat boiler
- flue gas
- header
- waste heat
- 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
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000003546 flue gas Substances 0.000 claims abstract description 31
- 239000002918 waste heat Substances 0.000 claims description 35
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 239000000428 dust Substances 0.000 claims description 12
- 239000002699 waste material Substances 0.000 abstract description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 23
- 239000000779 smoke Substances 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 241000886569 Cyprogenia stegaria Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
-
- 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
- F23G5/46—Recuperation of heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/20—Waste heat recuperation using the heat in association with another installation
- F23G2206/203—Waste heat recuperation using the heat in association with another installation with a power/heat generating installation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
Abstract
The utility model provides a waste incinerator overgrate air heating system, owing to set up exhaust-heat boiler front wall overgrate air mixing header and back wall overgrate air mixing header, the flue gas of exhaust-heat boiler export is pumped into by recirculation fan in exhaust-heat boiler front wall overgrate air mixing header and the back wall overgrate air mixing header, after evenly mixing with the air that the overfire fan extracted, the overgrate air is heated in mixing the header, need not to set up steam heater again, because the recirculated flue gas gets into overgrate air mixing header earlier, can fully mix with the overgrate air to spout inside the exhaust-heat boiler through the nozzle evenly, make overgrate air spout department flow field and temperature field distribution evenly, the burning is abundant, utilizes exhaust-heat boiler export flue gas that has higher temperature to heat overgrate air, effectively improves boiler efficiency. Meanwhile, the secondary air and the backflow flue gas are converged into the same header, so that the equipment space is effectively reduced, and the system arrangement is simplified.
Description
Technical Field
The invention relates to a secondary air heating system of a garbage incinerator.
Background
NOx (nitrogen oxides) is a pollutant generated during the incineration of waste. NOx can be classified into fuel type NOx, transient type NOx, and thermal type NOx according to combustion conditions and generation routes. Fuel-type NOx accounts for a substantial portion of the total NOx produced by a waste incinerator. The oxygen content of the air supply of the hearth is properly reduced, and the generation amount of fuel type NOx can be reduced. In order to reduce the concentration of NOx in the flue gas at the outlet of the waste heat boiler, part of the flue gas at the outlet of the bag type dust collector is extracted and sprayed back to the inside of the hearth, so that the oxygen content of air supply is reduced, and the generation amount of fuel type NOx is reduced.
In the prior art, because the recirculated flue gas is extracted from the outlet of the bag type dust collector, the flue gas is treated by the semi-dry type deacidification reaction tower and the bag type dust collector, the temperature of the flue gas is lower than that of the flue gas at the outlet of the waste heat boiler, and the moisture content of the flue gas is increased. The problem that brings like this is that, the partial heat of flue gas that comes out from the waste heat stove is lost by semi-dry deacidification reaction tower and bag collector whitely, and the flue gas of high moisture content returns to and spouts to be unfavorable for stable combustion in the furnace moreover.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a waste incinerator secondary air heating system, which is characterized in that a waste heat boiler front wall secondary air mixing collecting box and a waste heat boiler rear wall secondary air mixing collecting box are arranged, smoke at the outlet of a waste heat boiler is extracted by a recirculation fan and sent into the waste heat boiler front wall secondary air mixing collecting box and the waste heat boiler rear wall secondary air mixing collecting box, the smoke is uniformly mixed with air extracted by a secondary fan, secondary air is heated in the mixing collecting box, and the secondary air is heated by the smoke at the outlet of the waste heat boiler with higher temperature, so that the problems in the prior art are effectively solved.
The invention adopts the technical scheme that a secondary air heating system of a garbage incinerator comprises the incinerator, a waste heat boiler, a semi-dry deacidification reaction tower, a bag type dust remover, an induced draft fan, a chimney, a recirculation fan and a secondary fan, wherein smoke generated in the incinerator flows through the waste heat boiler, passes through the semi-dry deacidification reaction tower and the bag type dust remover, is pumped to the chimney by the induced draft fan and then is exhausted into the atmosphere, the secondary air heating system is characterized in that a front wall secondary air mixing header and a rear wall secondary air mixing header are respectively arranged at the bottoms of a front wall and a rear wall of a first flue of the waste heat boiler, part of smoke at the outlet of the waste heat boiler is pumped into the front wall secondary air mixing header and the rear wall secondary air mixing header by the recirculation fan before the semi-dry deacidification reaction tower and is uniformly mixed with the air pumped by the secondary fan, the secondary air is heated in the front wall secondary air mixing header and the rear wall secondary air mixing header and then sprayed into the first flue.
Preferably, a plurality of backflow nozzles are respectively arranged on the front wall and the rear wall of the waste heat boiler, and the flue gas extracted by the recirculation fan is mixed with secondary air and then sprayed into the first flue through the backflow nozzles.
Preferably, the front wall and the rear wall of the waste heat boiler are respectively provided with 9 backflow nozzles.
The invention has the beneficial effects that: a secondary air heating system of a garbage incinerator is provided with a waste heat boiler front wall secondary air mixing header and a rear wall secondary air mixing header, smoke at the outlet of the waste heat boiler is extracted by a recirculation fan and sent into the waste heat boiler front wall secondary air mixing header and the rear wall secondary air mixing header, the smoke is uniformly mixed with air extracted by a secondary fan, and secondary air is heated in the mixing header without a steam heater. The recirculated flue gas firstly enters the secondary air mixing header, can be fully mixed with the secondary air and is uniformly sprayed into the waste heat boiler through the nozzles, so that a flow field and a temperature field at the spraying position of the secondary air are uniformly distributed, the secondary air is fully combusted, the flue gas at the outlet of the waste heat boiler with higher temperature is used for heating the secondary air, and the boiler efficiency is effectively improved. Meanwhile, the secondary air and the backflow flue gas are converged into the same header, so that the equipment space is effectively reduced, and the system arrangement is simplified.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the prior art.
Fig. 2-3 illustrate one embodiment of the present invention. Wherein, fig. 2 is a schematic structural diagram of the present invention; fig. 3 is a partial structure enlarged view.
In the figure:
1. an incinerator;
2. a waste heat furnace; 2.1A first flue, 2.1A waste heat furnace front wall and 2.1B waste heat furnace rear wall;
3. a semi-dry deacidification reaction tower;
4. a bag type dust collector;
5. an induced draft fan;
6. a chimney;
7. a recirculation fan;
8. secondary air blower, 8.1 secondary air pipeline;
9. a front wall secondary air mixing header;
10. a rear wall secondary air mixing header;
11. and a reflux nozzle.
Detailed Description
Fig. 1 is a schematic structural diagram of an embodiment of the prior art. The figure shows that in the prior art, a secondary air heating system of a garbage incinerator comprises an incinerator 1, a waste heat boiler 2, a semi-dry deacidification reaction tower 3, a bag type dust collector 4, an induced draft fan 5, a chimney 6, a recirculation fan 7 and a secondary fan 8. And the flue gas generated in the incinerator 1 flows through the waste heat boiler 2, then passes through the semi-dry deacidification reaction tower 3 and the bag type dust collector 4, is pumped to the chimney 6 by the induced draft fan 5, and then is discharged into the atmosphere.
The recirculation fan 7 extracts a part of flue gas from the outlet of the bag type dust collector 4 and sends the part of flue gas to the bottoms of the front wall 2.1A and the rear wall 2.1B of the first flue 2.1 of the waste heat boiler 2. The secondary air extracted by the secondary fan 8 is also sent to the front wall 2.1A and the rear wall 2.1B of the first flue 2.1 of the waste heat boiler 2 through a secondary air pipeline 8.1.
The problem that prior art exists is that, the partial heat of flue gas that comes out from waste heat stove 2 is lost by semi-dry deacidification reaction tower and bag collector whitewashed, and the flue gas of high moisture content returns to and spouts to be unfavorable for stable combustion in the furnace moreover.
Fig. 2-3 illustrate one embodiment of the present invention. Wherein, fig. 2 is a schematic structural diagram of the present invention; fig. 3 is a partial structure enlarged view.
Fig. 2 shows that, unlike the prior art, in this example, a front wall secondary air mixing header 9 and a rear wall secondary air mixing header 10 are respectively disposed at the bottoms of the front wall 2.1A and the rear wall 2.1B of the first flue 2.1 of the exhaust-heat boiler 2, and before the semi-dry deacidification reaction tower 3, part of the flue gas at the outlet of the exhaust-heat boiler 2 is pumped into the front wall secondary air mixing header 9 and the rear wall secondary air mixing header 10 by the recirculation fan 7, and after being uniformly mixed with the air pumped by the secondary fan 8, the secondary air is heated in the front wall secondary air mixing header 9 and the rear wall secondary air mixing header 10 and then sprayed into the first flue 2.1.
Fig. 3 shows that 9 return nozzles 11 are respectively arranged on the front wall 2.1 and the rear wall 2.2 of the waste heat boiler, and the flue gas extracted by the recirculation fan 7 is mixed with secondary air and then sprayed into the first flue 2.1 through the return nozzles 11.
In this example, the exhaust-heat boiler 2 export flue gas that utilizes to have higher temperature heats the overgrate air, effectively improves boiler efficiency. Meanwhile, the secondary air and the return flue gas are respectively mixed in the front wall secondary air mixing header 9 and the rear wall secondary air mixing header 10, so that the secondary air is uniformly distributed in the flow field and the temperature field at the spraying position, and the combustion is complete. The efficiency of the boiler is effectively improved, the equipment space is reduced, and the system layout is simplified.
The invention suggests that the flue gas has higher concentration of acid gas and dust because the flue gas is not deacidified by the semi-dry deacidification reaction tower 3 and is not dedusted by the bag type deduster 4. Therefore, the recirculation fan 7 needs to adopt a backward impeller, the impeller adopts a wear-resistant coating, and the fan shell is made of stainless steel.
Claims (3)
1. A secondary air heating system of a garbage incinerator comprises an incinerator, a waste heat boiler, a semi-dry deacidification reaction tower, a bag type dust collector, an induced draft fan, a chimney, a recirculation fan and a secondary fan, the flue gas generated in the incinerator flows through the waste heat boiler, then passes through the semi-dry deacidification reaction tower and the bag type dust collector, is pumped to the chimney by the induced draft fan and then is discharged into the atmosphere, it is characterized in that a front wall secondary air mixing header and a rear wall secondary air mixing header are respectively arranged at the bottoms of the front wall and the rear wall of the first flue of the waste heat boiler, before the semi-dry type deacidification reaction tower, part of the flue gas at the outlet of the waste heat boiler is pumped by the recirculation fan and sent into the front wall secondary air mixing header and the rear wall secondary air mixing header, after being uniformly mixed with the air extracted by the secondary fan, the secondary air is heated in the front wall secondary air mixing header and the rear wall secondary air mixing header and then sprayed into the first flue.
2. The system as claimed in claim 1, wherein a plurality of return nozzles are provided on each of the front and rear walls of the waste heat boiler, and the flue gas extracted by the recirculation fan is mixed with the secondary air and then injected into the first flue through the return nozzles.
3. The secondary air heating system of a garbage incinerator according to claim 1, wherein said waste heat boiler front wall and rear wall are respectively provided with 9 nozzles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011429409.7A CN112460566A (en) | 2020-12-09 | 2020-12-09 | Secondary air heating system of garbage incinerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011429409.7A CN112460566A (en) | 2020-12-09 | 2020-12-09 | Secondary air heating system of garbage incinerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112460566A true CN112460566A (en) | 2021-03-09 |
Family
ID=74801700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011429409.7A Pending CN112460566A (en) | 2020-12-09 | 2020-12-09 | Secondary air heating system of garbage incinerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112460566A (en) |
-
2020
- 2020-12-09 CN CN202011429409.7A patent/CN112460566A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105782991B (en) | High-efficiency cleaning incinerator | |
| CN204042867U (en) | A kind of low-NO_x burner system | |
| CN109506231A (en) | Environment-friendly and energy-efficient biomass recirculating fluidized bed boiler steam/water circulating integrated morphology | |
| CN107420887A (en) | The biomass direct-fired device that oxygen-enriched combusting and flue gas recirculation are combined | |
| CN218721507U (en) | High-efficient domestic waste burns burning furnace air distribution system | |
| CN210069868U (en) | Grate furnace based on flue gas recirculation system | |
| CN113280351A (en) | Flue gas recirculation system of household garbage incineration power plant | |
| CN109764337A (en) | A kind of grate furnace and grate furnace cleaning burning process based on flue gas recirculation system | |
| CN105276566B (en) | Coal-fired boiler reform is the method for biomass boiler | |
| CN102734808A (en) | Low-odor type reed pulp black liquor combustion boiler and combustion method thereof | |
| CN111981473A (en) | Slag burnout system and method of biomass boiler | |
| CN201237236Y (en) | Composite secondary air apparatus for chain boiler combustion | |
| CN205619343U (en) | High -efficient clean burning furnace that burns | |
| CN214119983U (en) | Secondary air heating system of garbage incinerator | |
| CN217423262U (en) | Flue gas recirculation system of household garbage incineration power plant | |
| CN101413674A (en) | Oxygen-enriched air mixed blowing combustion adjuvant boiler energy-saving method and employed equipment thereof | |
| CN208546969U (en) | A kind of chain-grate boiler system of capacity-increasing transformation | |
| CN112460566A (en) | Secondary air heating system of garbage incinerator | |
| CN207751005U (en) | A kind of stove cigarette recycling coupling fume afterheat becomes energy level and utilizes system | |
| CN212456818U (en) | Slag burnout system of biomass boiler | |
| CN212537812U (en) | Air classification coupling flue gas recirculation's living beings low NOx burner | |
| CN104089299A (en) | Low-nitrogen combustion method | |
| CN209263015U (en) | Environment-friendly and energy-efficient biomass recirculating fluidized bed boiler steam/water circulating integrated morphology | |
| CN213334349U (en) | Low-temperature flue gas recirculation system for low-nitrogen combustion of pi-shaped boiler under low load | |
| CN217382951U (en) | Flue gas recirculation pipeline of waste incineration system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 518000 Room 101, No.1, environmental protection road, sifangpu community, Pingdi street, Longgang District, Shenzhen City, Guangdong Province Applicant after: Shenzhen Shenneng environmental protection East Co.,Ltd. Applicant after: Shenzhen Energy and environmental protection Co.,Ltd. Applicant after: Shenzhen Shenneng Environmental Protection City Environmental Service Co.,Ltd. Applicant after: Chaozhou Shenneng environmental protection Co.,Ltd. Applicant after: Guilin Shenneng environmental protection Co.,Ltd. Applicant after: WUHAN SHENNENG ENVIRONMENTAL PROTECTION NEW DITCH WASTE POWER GENERATION Co.,Ltd. Applicant after: Shanxian Shenneng environmental protection Co.,Ltd. Address before: 518000 Room 101, No.1, environmental protection road, sifangpu community, Pingdi street, Longgang District, Shenzhen City, Guangdong Province Applicant before: Shenzhen Shenneng environmental protection East Co.,Ltd. Applicant before: SHENZHEN ENERGY ENVIRONMENTAL ENGINEERING Co.,Ltd. Applicant before: Shenzhen Shenneng Environmental Protection City Environmental Service Co.,Ltd. Applicant before: Chaozhou Shenneng environmental protection Co.,Ltd. Applicant before: Guilin Shenneng environmental protection Co.,Ltd. Applicant before: WUHAN SHENNENG ENVIRONMENTAL PROTECTION NEW DITCH WASTE POWER GENERATION Co.,Ltd. Applicant before: Shanxian Shenneng environmental protection Co.,Ltd. |
|
| CB02 | Change of applicant information |