CN217274133U - Garbage grate furnace with smoke recirculation - Google Patents
Garbage grate furnace with smoke recirculation Download PDFInfo
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- CN217274133U CN217274133U CN202220104435.0U CN202220104435U CN217274133U CN 217274133 U CN217274133 U CN 217274133U CN 202220104435 U CN202220104435 U CN 202220104435U CN 217274133 U CN217274133 U CN 217274133U
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- flue gas
- recirculation
- smoke
- grate
- outlet
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- 239000000779 smoke Substances 0.000 title claims abstract description 29
- 239000010813 municipal solid waste Substances 0.000 title claims abstract description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 71
- 239000003546 flue gas Substances 0.000 claims abstract description 71
- 238000004064 recycling Methods 0.000 claims abstract description 33
- 238000002485 combustion reaction Methods 0.000 claims abstract description 12
- 238000000746 purification Methods 0.000 claims abstract description 12
- 239000002918 waste heat Substances 0.000 claims abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- 239000013589 supplement Substances 0.000 claims abstract description 4
- 239000000428 dust Substances 0.000 claims description 15
- 239000002699 waste material Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004056 waste incineration Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
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- 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
- Treating Waste Gases (AREA)
Abstract
A garbage grate furnace with smoke recirculation comprises a grate, a hearth and a waste heat boiler which are connected in sequence; the smoke outlet of the waste heat boiler is connected with a smoke purifying device; a flame folding angle is arranged between the fire grate and the hearth to form smoke backflow, and the upper part of the flame folding angle is connected with secondary air for oxygen supplement so that combustible substances in the smoke are fully burnt out; a recirculation nozzle is arranged on the flame folding angle and below the secondary air inlet; the recycling nozzle is connected with an outlet of the flue gas purification device to obtain recycling flue gas, and the combustion environment is organized by adjusting the feeding proportion of the recycling flue gas, so that the local part of the recycling flue gas is in an anoxic environment. The utility model has the advantages of the original emission of NOx is low, system reliability is high, the transformation is convenient.
Description
Technical Field
The utility model belongs to the technical field of the environmental protection, in particular to configuration flue gas recirculation's rubbish grate furnace.
Background
At present, the generation amount and the accumulation amount of urban garbage are increased year by year, and various industrial garbage and urban domestic garbage which are difficult to treat in time pose a great threat to the storage environment. The heat supply by using the municipal solid waste is one of the ideal methods for solving the problem of the municipal solid waste. The purpose of waste incineration is to incinerate waste as much as possible, so that the incinerated substances become harmless and the volume is reduced to the maximum extent, the generation of new pollutants is reduced, and secondary pollution is avoided. The burning treatment has the greatest advantage of good reduction effect, and the volume and the weight of the burning waste are reduced by more than 90 percent. The heat energy generated by burning the garbage is used for supplying heat, so that the urban garbage becomes new energy, which is not only beneficial to environmental protection, but also can obtain obvious economic benefit and social benefit.
For the garbage incinerator, the incineration flue gas needs deacidification, denitration, dust removal and the like to be intensively discharged. The emission limits of the current environmental protection standard on sulfur dioxide and nitrogen oxide are respectively 100mg/m 3 ，300mg/m 3 (hour average) (11% of the reference oxygen content) GB 18485-2014. The adopted environment-friendly facilities are generally SNCR, a semi-dry deacidification tower, activated carbon and a bag-type dust remover. With the technical progress and the higher and higher requirements on the environment, the emission limits of the local standard on sulfur dioxide and nitrogen oxide are respectively 35mg/m 3 ，100mg/m 3 (hour average value), and simultaneously, the requirement on ammonia escape is provided, and the ammonia escape concentration of the waste incineration exhaust gas generated by adopting the ammonia denitration and ammonia desulphurization processes is not higher than 8 mg/cubic meter, so that the SCR denitration device is partially added in the newly-built waste power plant. Through investigation, test and analysis, most of the flue gas of the existing garbage boilers has the following characteristics: the temperature fluctuation of the hearth is large, and the temperature fluctuation range of the hearth is 850 to990 ℃, resulting in large fluctuations in the original NOx emissions; denitration control is difficult to track in real time, so that the amount of the added reducing agent is excessive, ammonia escape is high, the NOx and ammonia escape are difficult to achieve and reach the standard at the same time, and meanwhile, the consumption of the reducing agent is high.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to provide a garbage grate furnace with smoke recirculation, which has the advantages of low original NOx emission, high system reliability, convenient transformation and the like.
In order to realize the purpose, the utility model discloses a technical scheme is:
a garbage grate furnace with smoke recirculation comprises a grate, a hearth and a waste heat boiler which are connected in sequence; the smoke outlet of the waste heat boiler is connected with a smoke purifying device;
a flame folding angle is arranged between the fire grate and the hearth to form smoke backflow, and secondary air is connected to the upper part of the flame folding angle to supplement oxygen, so that combustible substances in the smoke are fully combusted; a recirculation nozzle is arranged on the flame folding angle and below the secondary air inlet; the recycling nozzle is connected with an outlet of the flue gas purification device to obtain recycling flue gas, and the combustion environment is organized by adjusting the feeding proportion of the recycling flue gas, so that the local part of the recycling flue gas is in an anoxic environment.
In one embodiment, the fire grate is used for receiving garbage and organizing preliminary combustion, the fire grate is obliquely arranged, the inlet and the outlet are arranged at the top end, the primary air chamber is arranged below the fire grate, air is supplied by the primary fan, and primary air enters the fire grate organization combustion environment through the primary air chamber, so that the garbage is preliminarily combusted.
In one embodiment, the hearth is used for organizing the smoke to be combusted again and burnt out, the hearth is vertically arranged, the bottom end of the hearth is connected with the outlet of the fire grate through a flame folding angle, and the smoke is connected with a waste heat boiler through the outlet at the top end after being folded back for a plurality of times.
In one embodiment, exhaust-heat boiler is used for recycle flue gas heat, flue gas purification device includes deacidification tower and dust remover, and the flue gas gets into deacidification tower, dust remover in proper order after the exhaust-heat boiler heat transfer and carries out the deacidification, removes dust, and the export of dust remover connects the induced draft fan, and the export of induced draft fan is divided into two routes, and one way connects the chimney, and another way connects the recirculation spout.
In one embodiment, the flare angle is a length of diagonal tubing.
In one embodiment, a recirculation primary door, a recirculation fan and a recirculation secondary door are sequentially arranged on a connecting pipeline between the outlet of the flue gas purification device and the recirculation nozzle, and are used for controlling the switching of the recirculation system and the adjustment of the input proportion of the recirculation flue gas.
In one embodiment, a meter is arranged on a connecting pipeline between the outlet of the flue gas purification device and the recirculation nozzle, and the monitored objects of the meter comprise the temperature, the pressure and the flow of the recirculation flue gas.
In one embodiment, the recirculation nozzles are arranged at the front and rear walls of the furnace.
Compared with the prior art, the utility model adopts the clean flue gas at the outlet of the draught fan to be directly sent to the hearth through the recirculation fan, the whole flue gas temperature is higher than the acid dew point, the corrosion caused by the condensation of the flue gas is avoided, and the system reliability is high; the recycling nozzle is arranged below the secondary air port, so that a local anoxic environment can be formed more effectively, and the original emission of NOx is lower; the system can be implemented by matching a newly-built boiler, can also be implemented by modification in the process of maintenance, and is convenient to modify.
Drawings
Fig. 1 is a schematic view of the process of the present invention.
Wherein: 1. the system comprises a grate 2, a hearth 3, a waste heat boiler 4, a deacidification tower 5, a dust remover 6, a chimney 7, an induced draft fan 8, a recycling primary door 9, a meter 10, a recycling fan 11, a secondary fan 12, a primary fan 13, a recycling secondary door 14, a recycling nozzle 15 and a primary air chamber.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the drawings and examples.
Referring to fig. 1, the utility model relates to a configuration flue gas recirculation's rubbish grate furnace, including grate 1, furnace 2 and exhaust-heat boiler 3 that meet in proper order.
The grate 1 is used for receiving garbage and organizing primary combustion. In this embodiment, the inlet and outlet are arranged obliquely, the inlet and outlet are all at the top end, and the inlet is horizontal. A primary air chamber 15 is arranged below the grate 1, air is supplied by a primary air fan 12, and primary air enters the grate 1 through the primary air chamber 15 to organize a combustion environment, so that garbage is combusted primarily. The air supply from the primary air chamber 15 is directed vertically upwards.
The hearth 2 is used for organizing the smoke to burn again and burn out, the main body of the hearth is vertically arranged, the bottom end of the hearth is connected with the outlet of the fire grate 1 through a flame folding angle 16, and the smoke is connected with the waste heat boiler 3 through the outlet at the top end after being turned back for a plurality of times.
The waste heat boiler 3 is used for recycling the heat of the flue gas, and a flue gas outlet of the waste heat boiler is connected with a flue gas purification device. In this embodiment, the flue gas purification device mainly includes deacidification tower 4 and dust remover 5, and the flue gas gets into deacidification tower 4, dust remover 5 in proper order after 3 heat exchanges of exhaust-heat boiler and carries out the deacidification, remove dust.
The invention forms flue gas reflux through the flame folding angle 16 between the fire grate 1 and the hearth 2. And secondary air is connected to the upper part of the flame folding angle 16 for oxygen supplement, so that combustible substances in the flue gas are fully combusted. Illustratively, the flare angle 16 is a length of diagonal tubing. In addition, a recycling nozzle 14 is arranged on the folded flame angle 16 and below the secondary air inlet, the recycling nozzle 14 can be arranged on the front wall and the rear wall of the hearth, the recycling nozzle 14 is connected with the outlet of the flue gas purification device to obtain recycled flue gas, and the combustion environment is organized by adjusting the input proportion of the recycled flue gas, so that a local part (namely the folded flame angle 16 area) is in an anoxic environment.
In a specific embodiment, the outlet of the dust remover 5 is connected with an induced draft fan 7, the outlet of the induced draft fan 7 is divided into two paths, one path is connected with a chimney 6, the clean flue gas out of the dust remover 5 enters the chimney 6 under the action of the induced draft fan 7 and is exhausted to the atmosphere, the other path is connected with a recirculation nozzle 14, the other part of the clean flue gas out of the induced draft fan 7 is sent into the furnace through the recirculation nozzle 14, the combustion environment is organized by adjusting the amount of the recirculation flue gas, so that the local part is in an anoxic environment, and the original generation amount of NOx is reduced. And a recirculation primary door 8, a recirculation fan 10 and a recirculation secondary door 13 are sequentially arranged on a connecting pipeline, namely a recirculation flue gas pipeline, of the recirculation nozzle 14 so as to control switching of a recirculation system and adjustment of the input proportion of recirculation flue gas, and the input proportion of recirculation flue gas can also be adjusted by the output of the recirculation fan 10. Illustratively, the input proportion of the recycled flue gas is the ratio of the recycled flue gas amount to the total flue gas amount of the boiler, and the range is 0-25%. The total smoke of the boiler is the full-load smoke of the boiler. Further, an instrument 9 can be arranged on the recirculation flue gas pipeline, and monitoring objects of the instrument 9 comprise the temperature, the pressure and the flow of the recirculation flue gas and are used for monitoring the input proportion of the recirculation flue gas.
The utility model discloses a theory of operation is:
taking a garbage grate furnace as an example, the flue gas recycling process of the utility model is adopted to extract a part of clean flue gas from a draught fan, the clean flue gas is sent into the furnace through a recycling nozzle arranged below a secondary air port by a recycling fan, and the combustion environment is organized by adjusting the recycling flue gas volume, so that the local part is in an anoxic environment, and the original generation amount of NOx is reduced; a recycling primary door is arranged at the inlet of the recycling fan, and a recycling secondary door is arranged on the flue gas pipeline in front of the recycling nozzle and used for switching of the recycling system and adjusting the recycling flue gas input proportion; the input proportion of the recirculated flue gas can also be adjusted by the output of the recirculation fan; and the recycled flue gas pipeline is provided with instruments, and the instruments comprise temperature, pressure and flow and are used for monitoring the input proportion of the recycled flue gas. The flue gas is directly sent to a hearth through a recirculation fan, the integral flue gas temperature is higher than the acid dew point, the corrosion caused by flue gas condensation is avoided, and the system reliability is high; the recycling nozzle is arranged below the secondary air port, so that a local anoxic environment can be formed more effectively, and the original emission of NOx is lower; the system can be implemented by matching with a newly-built boiler, can also be implemented by modification in the process of maintenance, is convenient to modify, and has the advantages of low original NOx emission, high system reliability, convenience in modification and the like.
The above detailed description is for one embodiment of the present invention, but the present invention is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All changes and improvements made in accordance with the scope of the present invention should still fall within the scope of the present invention.
Claims (8)
1. A garbage grate furnace with smoke recirculation is characterized by comprising a grate (1), a hearth (2) and a waste heat boiler (3) which are connected in sequence; the smoke outlet of the waste heat boiler (3) is connected with a smoke purifying device;
a flame folding angle (16) is arranged between the fire grate (1) and the hearth (2) to form smoke backflow, and secondary air is connected to the upper part of the flame folding angle (16) for oxygen supplement so that combustible materials in the smoke are fully burnt out; a recirculation nozzle (14) is arranged on the flame folding angle (16) and below the secondary air inlet; the recycling nozzle (14) is connected with an outlet of the flue gas purification device to obtain recycling flue gas, and the combustion environment is organized by adjusting the feeding proportion of the recycling flue gas, so that the local part of the recycling flue gas is in an anoxic environment.
2. The waste grate furnace with the smoke recirculation function as claimed in claim 1, wherein the grate (1) is used for receiving waste and organizing the primary combustion, the grate is obliquely arranged, an inlet and an outlet are arranged at the top end, a primary air chamber (15) is arranged below the grate (1), air is supplied by a primary fan (12), and the primary air enters the combustion environment organized by the grate (1) through the primary air chamber (15) so as to enable the waste to be primarily combusted.
3. The waste grate furnace with flue gas recirculation according to claim 1, characterized by that the furnace (2) is used to organize the flue gas to be burned again and burnt out, and it is vertically arranged, the bottom end is connected with the outlet of the grate (1) through a folded flame angle (16), and the flue gas is connected with the waste heat boiler (3) through the top end outlet after being folded back for several times.
4. The waste grate furnace with the smoke recirculation function as claimed in claim 1, wherein the exhaust-heat boiler (3) is used for recycling smoke heat, the smoke purification device comprises a deacidification tower (4) and a dust remover (5), smoke enters the deacidification tower (4) and the dust remover (5) in sequence after being subjected to heat exchange by the exhaust-heat boiler (3) to be deacidified and dedusted, an outlet of the dust remover (5) is connected with the draught fan (7), an outlet of the draught fan (7) is divided into two paths, one path is connected with the chimney (6), and the other path is connected with the recirculation nozzle (14).
5. Waste grate furnace equipped with flue gas recirculation according to claim 1, characterized by the fact that the flame break (16) is a piece of diagonal piping.
6. The waste grate furnace with the configured flue gas recirculation function according to claim 1, wherein a recirculation primary door (8), a recirculation fan (10) and a recirculation secondary door (13) are sequentially arranged on a connecting pipeline between the outlet of the flue gas purification device and the recirculation nozzle (14) and are used for controlling the switching of the recirculation system and adjusting the input proportion of the recirculation flue gas.
7. The waste grate furnace with flue gas recirculation according to claim 6, characterized in that an instrument (9) is arranged on a connecting pipeline between the outlet of the flue gas purification device and the recirculation nozzle (14), and the monitored objects of the instrument (9) comprise the temperature, the pressure and the flow of the recirculation flue gas.
8. Waste grate furnace equipped with flue gas recirculation according to claim 1, characterized in that the recirculation nozzles (14) are arranged at the front and rear walls of the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220104435.0U CN217274133U (en) | 2022-01-15 | 2022-01-15 | Garbage grate furnace with smoke recirculation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220104435.0U CN217274133U (en) | 2022-01-15 | 2022-01-15 | Garbage grate furnace with smoke recirculation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217274133U true CN217274133U (en) | 2022-08-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220104435.0U Active CN217274133U (en) | 2022-01-15 | 2022-01-15 | Garbage grate furnace with smoke recirculation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217274133U (en) |
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2022
- 2022-01-15 CN CN202220104435.0U patent/CN217274133U/en active Active
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