CN215259855U - Low-nitrogen combustion waste incinerator grate - Google Patents
Low-nitrogen combustion waste incinerator grate Download PDFInfo
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- CN215259855U CN215259855U CN202120513215.9U CN202120513215U CN215259855U CN 215259855 U CN215259855 U CN 215259855U CN 202120513215 U CN202120513215 U CN 202120513215U CN 215259855 U CN215259855 U CN 215259855U
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Abstract
The utility model discloses a waste incineration grate furnace of low-nitrogen combustion relates to waste incineration flue gas treatment technical field. The system comprises a waste incineration grate furnace, a waste heat boiler, a deacidification tower, a dust remover, an induced draft fan, a chimney, a circulating flue and a secondary air pipeline; the outlet of the circulating flue is connected to the flue between the induced draft fan and the chimney; the flue gas generated by burning the garbage in the garbage burning grate furnace is sent into a chimney through a waste heat boiler, a deacidification tower, a dust remover and a draught fan in sequence and is discharged. The utility model discloses simple structure newly-built or reform transform and all realize easily, and occupation of land is few, and the investment is little, and the operation fault rate is low.
Description
Technical Field
The utility model relates to a msw incineration flue gas handles technical field, and the more specifically msw incineration grate furnace that says so is a low nitrogen burning.
Background
When municipal solid waste is combusted in an incinerator, a series of byproducts can be generated, wherein NOx is an important pollutant, the national requirement for the emission of NOx is strict, and the national standard emission limit value is 250mg/Nm3The standard of some regions has been improved to 100mg/Nm3Or lower concentrations. Currently, in the face of NOx upgrading and NOx annual emission total limit, the implemented denitration methods of the garbage power plant mainly include SNCR, SCR, PNCR and flue gas recirculation technology (FGR).
From the viewpoint of investment and operation cost, the several denitration modes satisfy the following formula: FGR < SNCR < PNCR < SCR, and the research on flue gas recirculation technology (FGR) is significant for garbage power plants.
Flue gas recirculation is a low nitrogen combustion technology that controls the generation of NOx during combustion. The low-temperature and low-oxygen flue gas is recycled into the hearth, so that the flame temperature can be reduced, the oxygen partial pressure is reduced, the mixing of air and fuel is promoted, the generation and emission of NOx are reduced, and the consumption of a reducing agent is reduced. In addition, the flue gas recirculation technology can improve the adaptability of the system to the heat value of the garbage, reduce the furnace temperature, effectively reduce the coking of a hearth and relieve the impact of the garbage heat value improvement on an incineration system caused by garbage classification to a certain extent.
By adopting the flue gas recirculation technology, only a flue, an adjusting valve, a circulating fan (or a secondary fan) and the like are needed to be added, the investment cost is low, the emission of NOx can be effectively reduced, the cost of a reducing agent of a denitration system is reduced, and the economic benefit is remarkable.
Patent CN211526440U discloses a waste incineration flue gas cyclic utilization device, replaces the overgrate air with the recirculated flue gas of hypoxemia, reduces the interior O of stove2The content is reduced, so that the generation of NOx is reduced, and meanwhile, the oxygen supplement design of a furnace wall cooling air system is increased; patent CN206540138U discloses a waste incineration cigaretteAnd the gas recirculation system heats the primary air by utilizing the circulating flue gas and then enters the hearth.
The inventor finds that the following defects still exist in the prior art:
1) the carbon monoxide exceeds the standard due to the adoption of the circulating flue gas to replace secondary air, and the temperature of the secondary air entering a hearth is too high due to the adoption of furnace wall cooling air for oxygen supplement, so that the flue gas is not favorably mixed;
2) when the circulating flue gas directly enters the hearth, the local combustion is insufficient, the concentration of the precursor generated by carbon monoxide and dioxin is increased, a heat exchanger is additionally arranged, and the investment cost is increased.
Therefore, it is necessary to develop a low-nitrogen combustion waste incineration grate furnace.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defects of the prior art and providing the low-nitrogen combustion waste incineration grate furnace.
In order to realize the purpose, the technical scheme of the utility model is that: low nitrogen combustion's waste incineration grate furnace, its characterized in that: the system comprises a waste incineration grate furnace, a waste heat boiler connected with a waste incineration grate furnace outlet, a deacidification tower connected with the waste heat boiler, a dust remover connected with the deacidification tower, an induced draft fan connected with the dust remover, a chimney connected with the induced draft fan, a circulating flue connected with the induced draft fan, and a secondary air pipeline connected with the circulating flue; the outlet of the circulating flue is connected to the flue between the induced draft fan and the chimney;
smoke generated by burning the garbage in the garbage burning grate furnace is sent into a chimney through a waste heat boiler, a deacidification tower, a dust remover and a draught fan in sequence and is discharged;
the circulating flue gas enters a circulating flue and is mixed with air in a secondary air pipeline, and the mixed gas enters a waste incineration grate furnace.
In the technical scheme, the circulating flue is connected with a secondary air pipeline and then sequentially enters the waste incineration grate furnace through the secondary air fan and the secondary air inlet.
In the technical scheme, the outlet of the circulating flue is provided with the regulating valve.
In the technical scheme, the circulating flue gas accounts for 20-50% of the total amount of the mixed gas.
In the technical scheme, the secondary air pipeline is connected with a secondary air inlet through a secondary air fan;
the circulating flue is connected with a circulating flue gas inlet through a variable frequency fan;
and the secondary air inlet and the circulating flue gas inlet are connected with a grate of the garbage incinerator.
In the technical scheme, the included angle between the secondary air inlet and the circulating flue gas inlet is 0-30 degrees.
In the technical scheme, the secondary air inlet and the circulating flue gas inlet are arranged in a single-hole staggered mode.
In the technical scheme, the secondary air inlets and the circulating flue gas inlets are arranged in a staggered mode.
Compared with the prior art, the utility model has the advantages of it is following:
1) the utility model has simple structure, easy realization of new construction or reconstruction, small land occupation, small investment and low operation failure rate;
2) the utility model has high adjustability, can adjust the circulating smoke volume according to the combustion working condition and the pollutant discharge condition, and can effectively control the generation of nitrogen oxides and adjust the temperature of the hearth;
4) the utility model draws the circulating flue gas from the back of the draught fan, and can reduce the input cost of overcoming the pressure drawn by the circulating flue gas by utilizing the pressure of the draught fan;
5) the utility model can select the secondary air inlet device according to the condition of the incinerator, and has wide applicability;
6) the utility model discloses overgrate air entry and circulation flue export become angle staggered arrangement, can form the vortex in furnace, cause the difference in temperature at the part, and flue gas disturbance mixes in the enhancement furnace, is favorable to the burning.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
FIG. 3 is a schematic diagram of a secondary air inlet and a circulating flue gas inlet in a single-hole staggered arrangement.
FIG. 4 is a schematic view of the staggered arrangement of rows and columns of overfire air inlets and recirculated flue gas inlets.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be apparent and readily appreciated by the description.
With reference to the accompanying drawings: low nitrogen combustion's waste incineration grate furnace, its characterized in that: the waste incineration grate furnace comprises a waste incineration grate furnace 1, a waste heat boiler 2 connected with an outlet of the waste incineration grate furnace 1, a deacidification tower 3 connected with the waste heat boiler 2, a dust remover 4 connected with the deacidification tower 3, an induced draft fan 5 connected with the dust remover 4, a chimney 6 connected with the induced draft fan 5, a circulating flue 7 connected with the induced draft fan 5, and a secondary air pipeline 8 connected with the circulating flue 7; the outlet of the circulating flue 7 is connected to the flue between the induced draft fan 5 and the chimney 6;
smoke generated by burning the garbage in the garbage burning grate furnace 1 is sent into a chimney 6 through a waste heat boiler 2, a deacidification tower 3, a dust remover 4 and a draught fan 5 in sequence and is discharged;
the circulating flue gas enters a circulating flue 7 and is mixed with air in a secondary air pipeline 8, and the mixed gas enters the waste incineration grate furnace 1.
The circulating flue 7 is connected with a secondary air pipeline 8 and then sequentially enters the waste incineration grate furnace 1 through a secondary air fan 81 and a secondary air inlet 82.
An adjusting valve 71 is arranged at the outlet of the circulating flue 7.
The circulating flue gas accounts for 20-50% of the total amount of the mixed gas.
The secondary air pipeline 8 is connected with a secondary air inlet 82 through a secondary air fan 81;
the circulating flue 7 is connected with a circulating flue gas inlet 73 through a variable frequency fan 72;
the secondary air inlet 82 and the circulating flue gas inlet 73 are connected with the waste incineration grate furnace 1.
The included angle between the secondary air inlet 82 and the circulating flue gas inlet 73 is 0-30 degrees.
The secondary air inlet 82 and the circulating flue gas inlet 73 are arranged in a single-hole staggered mode.
The secondary air inlets 82 and the circulating flue gas inlets 73 are arranged in staggered rows.
Example one
Flue gas generated by burning garbage in the garbage burning grate furnace 1 sequentially passes through a waste heat boiler 2 for heat exchange, a deacidification tower 3 for removing acidic pollutants and a dust remover 4 for dust removal and purification, and then enters a chimney 6 through an induced draft fan 5 to be discharged into the atmosphere; when the concentration of nitrogen oxides in the outlet flue gas is overhigh or the oxygen content is higher than 5%, a circulating flue 7 is connected between an induced draft fan 5 and a chimney 6, the pressure after the induced draft fan 5 and the suction force of a secondary fan 81 are used for introducing clean circulating flue gas with low oxygen content in the flue after the induced draft fan 5 into the circulating flue 7, the circulating flue gas is mixed with air in a secondary air pipeline 8, the opening of an adjusting valve 71 is adjusted to control the amount of the circulating flue gas entering the circulating flue 7, the oxygen content of the flue gas outlet is controlled to be 3% -6%, the generation of oxides is reduced, and the emission of carbon monoxide is controlled.
Example two
The flue gas generated by burning the garbage in the garbage burning grate furnace 1 is subjected to heat exchange in the waste heat boiler 2, acidic pollutant removal in the deacidification tower 3 and dust removal and purification in the dust remover 4, and then enters the chimney 6 through the induced draft fan 5 to be discharged into the atmosphere. When the concentration of nitrogen oxides in the outlet flue gas is monitored to be too high or the oxygen content is monitored to be higher than 5%, a circulating flue gas pipeline 7 is connected between an induced draft fan 5 and a chimney 6, and clean circulating flue gas with low oxygen content in a flue behind the induced draft fan 5 is sent into a hearth of the waste incineration grate furnace 1 through a variable frequency fan 72 and a circulating flue gas inlet 73; the secondary air pipeline 8 sends air into the hearth of the waste incineration grate furnace 1 through a secondary fan 81 and a secondary air inlet 82; the included angle between the secondary air inlet 82 and the circulating flue gas inlet 73 is 0-30 degrees, the circulating flue gas and the secondary air form an angle to be sprayed into the hearth of the waste incineration grate furnace 1, so that the flue gas forms a vortex in the hearth, the secondary air inlet 82 and the outlet of the circulating flue gas inlet 73 are arranged in a staggered mode, the secondary air, the circulating flue gas and the flue gas in the hearth at different temperatures are mixed in a strong disturbance mode, oxygen is fully involved in combustion, the amount of the circulating flue gas sprayed into the hearth of the waste incineration grate furnace 1 is controlled through the variable frequency fan 72, the oxygen content of the outlet is controlled within the range of 3% -6%, the generation of nitrogen oxides is reduced, the combustion can be effectively enhanced, the generation of insufficient combustion products is reduced, and the low-temperature synthesis amount of dioxin is reduced.
In actual use, the variable frequency fan 72 and the secondary fan 81 can be controlled in a linkage manner to jointly adjust the oxygen content in the hearth of the waste incineration grate furnace 1, so that the aim of controlling the generation of nitrogen oxides is fulfilled.
Other parts not described belong to the prior art.
Claims (8)
1. Low nitrogen combustion's waste incineration grate furnace, its characterized in that: the waste incineration grate furnace comprises a waste incineration grate furnace (1), a waste heat boiler (2) connected with an outlet of the waste incineration grate furnace (1), a deacidification tower (3) connected with the waste heat boiler (2), a dust remover (4) connected with the deacidification tower (3), an induced draft fan (5) connected with the dust remover (4), a chimney (6) connected with the induced draft fan (5), a circulating flue (7) connected with the induced draft fan (5), and a secondary air pipeline (8) connected with the circulating flue (7); the outlet of the circulating flue (7) is connected to the flue between the induced draft fan (5) and the chimney (6);
smoke generated by burning the garbage in the garbage burning grate furnace (1) is sent into a chimney (6) through a waste heat boiler (2), a deacidification tower (3), a dust remover (4) and a draught fan (5) in sequence and is discharged;
the circulating flue gas enters a circulating flue (7) to be mixed with air in a secondary air pipeline (8), and the mixed gas enters the waste incineration grate furnace (1).
2. The low nitrogen fired waste incinerator of claim 1 wherein: the circulating flue (7) is connected with a secondary air pipeline (8) and then sequentially enters the waste incineration grate furnace (1) through a secondary air fan (81) and a secondary air inlet (82).
3. The low nitrogen fired waste incinerator of claim 2 wherein: an adjusting valve (71) is arranged at the leading-out opening of the circulating flue (7).
4. The low nitrogen fired waste incinerator of claim 3 wherein: the circulating flue gas accounts for 20-50% of the total amount of the mixed gas.
5. The low nitrogen fired waste incinerator of claim 1 wherein: the secondary air pipeline (8) is connected with a secondary air inlet (82) through a secondary air fan (81);
the circulating flue (7) is connected with a circulating flue gas inlet (73) through a variable frequency fan (72);
the secondary air inlet (82) and the circulating flue gas inlet (73) are connected with the waste incineration grate furnace (1).
6. The low nitrogen fired waste incinerator of claim 5, characterized by: the included angle between the secondary air inlet (82) and the circulating flue gas inlet (73) is 0-30 degrees.
7. The low nitrogen fired waste incinerator of claim 6, characterized by: the secondary air inlet (82) and the circulating flue gas inlet (73) are arranged in a single-hole staggered mode.
8. The low nitrogen fired waste incinerator of claim 6, characterized by: the secondary air inlet (82) and the circulating flue gas inlet (73) are arranged in a staggered row.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120513215.9U CN215259855U (en) | 2021-03-11 | 2021-03-11 | Low-nitrogen combustion waste incinerator grate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120513215.9U CN215259855U (en) | 2021-03-11 | 2021-03-11 | Low-nitrogen combustion waste incinerator grate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114636159A (en) * | 2022-02-09 | 2022-06-17 | 中国恩菲工程技术有限公司 | Mechanical grate furnace garbage incineration equipment and method |
| CN116857657A (en) * | 2022-10-14 | 2023-10-10 | 山东交通学院 | Garbage incinerator and purification process thereof |
-
2021
- 2021-03-11 CN CN202120513215.9U patent/CN215259855U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114636159A (en) * | 2022-02-09 | 2022-06-17 | 中国恩菲工程技术有限公司 | Mechanical grate furnace garbage incineration equipment and method |
| CN116857657A (en) * | 2022-10-14 | 2023-10-10 | 山东交通学院 | Garbage incinerator and purification process thereof |
| CN116857657B (en) * | 2022-10-14 | 2024-04-09 | 山东交通学院 | Garbage incinerator and purification process thereof |
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