CN217423262U - Flue gas recirculation system of household garbage incineration power plant - Google Patents
Flue gas recirculation system of household garbage incineration power plant Download PDFInfo
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- CN217423262U CN217423262U CN202121442533.7U CN202121442533U CN217423262U CN 217423262 U CN217423262 U CN 217423262U CN 202121442533 U CN202121442533 U CN 202121442533U CN 217423262 U CN217423262 U CN 217423262U
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- flue gas
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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
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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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a flue gas recirculation system of domestic waste incineration power plant contains burns burning furnace, reaction tower, dust remover, draught fan, chimney and air heater, burns burning furnace's exhanst gas outlet and reaction tower access connection, and the reaction tower export is connected with dust remover one end, and the dust remover other end is connected with draught fan one end, and the draught fan other end is connected with the chimney, and air heater one end lets in the air, and the air heater other end and draught fan other end are connected and are burnt burning furnace secondary plenum. The utility model discloses a recirculated flue gas replaces partial overgrate air to make the interior inert gas content of combustion area increase, and the flue gas heat absorption with diluted the concentration of oxygen, stretch the burning with combustion air in high temperature hypoxemia atmosphere, and the flame volume enlarges at double, has reduced local high-temperature region, and temperature distribution is more even, and this has not only restrained heating power type NOx's formation, also enables furnace's coking problem and has obtained the improvement to thermal efficiency and generated energy have been improved.
Description
Technical Field
The utility model relates to a flue gas recirculation system, especially a flue gas recirculation system of domestic waste incineration power plant belongs to the msw incineration processing field.
Background
Along with the improvement of the economic level, the development of the waste incineration power generation industry is favorable for resource recycling, harmlessness, energy conservation and other advantages, and is popularized and developed by a plurality of international countries. At present, the technology of part developed countries is more advanced, can high-efficient processing burn the flue gas that produces, reduces the emission of pollutant, can reach zero pollution's effect even. At present, the domestic waste incineration power plant has incomplete technology, generally serious coking and high furnace shutdown ash removal frequency; the combustion is unstable, the temperature fluctuation of the first flue is large, and the environment-friendly requirement of 850 ℃ and 2s is influenced; the waste heat boiler has low combustion efficiency and influences the evaporation capacity of the boiler; the concentration of NOx emission is relatively high, the consumption of reducing agent is large, and the like.
In a combustion method using ultra-low-volume air, which has been developed in recent years, a part of flue gas generated by burning is extracted and mixed with combustion air, and then the mixture is fed into a furnace to be burned. The flue gas is basically inert gas, and the heat absorption and the reduction of the oxygen concentration of the flue gas reduce the temperature of a main combustion area, so that the generation of NOx can be reduced. The circulating flue gas is sprayed to the proper position of the incinerator to prevent the hearth from coking due to overhigh temperature. Under the high-temperature low-oxygen environment, the garbage is more fully and stably combusted, the retention time in the furnace is ensured, and the yield of steam is improved.
The chinese intellectual property office 2020, 4.7.s discloses a utility model patent with publication number CN212178888U, entitled "a system for reducing nitrogen oxide emission of garbage incinerator", which provides a method for reducing nitrogen oxide emission of garbage incinerator comprising: an inlet pipeline of the primary air blower sucks air from the garbage pit, an outlet of the induced draft fan is connected with a flue gas recirculation pipe, and the flue gas recirculation pipe is connected with an inlet of the primary air blower; an outlet pipe of the primary air fan is heated by a heating surface at the tail part of the boiler and then is sent to a primary air chamber; the primary air chamber is also provided with a hearth which is provided with a secondary fan inlet, and the flue gas recirculation pipe is communicated with the secondary fan inlet. This patent suffers from the following drawbacks: 1) the primary air is sucked from the garbage pit in front of the furnace to the heated surface at the tail part for heating and then is sent back to the front of the furnace, the flue gas recirculation pipe at the tail part is connected with the primary air inlet pipe in front of the furnace, and the pipeline is too long and is complex to integrally arrange.
The chinese intellectual property office 2020, 7/23/year discloses a utility model patent with publication number CN211119357U, entitled "a domestic waste incineration apparatus", which provides a domestic waste incineration apparatus comprising: burn burning furnace and the gas cleaning device who is connected with burning furnace, the entry and the gas cleaning device exit linkage of recirculated flue gas pipeline, the export of recirculated flue gas pipeline extends to the larynx mouth of burning furnace, and recirculated flue gas lets in burning furnace as the overgrate air, and the tie point of burn-off air pipeline and burning furnace is located the top of the tie point of recirculated flue gas pipeline and burning furnace, and the burn-off air pipeline is used for carrying the air to burning furnace. The patent has the following defects: 1) the air supplemented from the burnout air pipe is cold air, which can affect the temperature distribution of the hearth under the condition of large air quantity, possibly resulting in insufficient combustion and failing to meet the requirement of flue gas at 850 ℃/2 seconds. 2) Two fans are required to separately introduce the recirculated flue gas and the burnout zone air into the furnace.
The chinese intellectual property office 2018, 1 month and 30 days, discloses a utility model patent with publication number CN206944178U, entitled "a flue gas treatment system", which provides a flue gas treatment system comprising: an incinerator; the flue gas cooling system is used for cooling high-temperature flue gas discharged by the incinerator to obtain cooling flue gas; and the flue gas recirculation system converts part of the cooled flue gas into recirculated flue gas and introduces the recirculated flue gas into the incinerator. This patent suffers from the following drawbacks: when the oxygen content in the flue gas is low and the primary air or the secondary air is completely replaced by the recycled flue gas, the recycled flue gas quantity must be increased in order to ensure the discharge amount of CO, but the combustion temperature is reduced and the incomplete combustion is increased due to a large amount of flue gas.
From the above, the existing flue gas recirculation technology of the domestic waste incineration power plant mainly has the following problems: 1. the primary and secondary air pipes are completely combined with the flue gas recirculation pipeline system, so that the pipeline arrangement is long; 2. the supplementary air is cold air, which influences the temperature distribution of the hearth; 3. the independent introduction of air requires an additional fan, so that the cost is increased; 4 complete replacement of the primary or secondary air with recycled flue gas mass, may result in incomplete combustion.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a flue gas recirculation system of domestic waste incineration power plant is provided, replace the increase of multicore gas content in the part secondary plenum combustion area through the recirculated flue gas, restrain heating power type NOx's formation to improve furnace's coking problem.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
the utility model provides a flue gas recirculation system of domestic waste incineration power plant which characterized in that: contain and burn burning furnace, reaction tower, dust remover, draught fan, chimney and air heater, burn the exhanst gas outlet and the reaction tower access connection of burning furnace, the reaction tower export is connected with dust remover one end, and the dust remover other end is connected with draught fan one end, and the draught fan other end is connected with the chimney, and air heater one end lets in the air, and the air heater other end and the connection of the draught fan other end burn burning furnace secondary plenum.
Furthermore, one end of the air preheater is connected with one end of a cold air pipeline, air is introduced into the other end of the cold air pipeline, the other end of the air preheater is connected with one end of a secondary air pipeline, the other end of the secondary air pipeline is connected with one end of a flue gas recirculation fan, the other end of the flue gas recirculation fan is connected with a secondary air chamber through an outlet pipeline, and the secondary air chamber is communicated with a hearth of the incinerator.
Furthermore, a first air adjusting door is arranged on the secondary air pipeline.
Further, the other end of the induced draft fan is connected with the secondary air pipeline through a flue gas recirculation pipeline, and the connecting position of the flue gas recirculation pipeline and the secondary air pipeline is located between the flue gas recirculation fan and the first air adjusting door.
Further, a second air adjusting door is arranged on the smoke recycling pipeline.
Furthermore, the upper side of the tail end of the fire grate of the incinerator is connected with one end of a leading-out pipeline, the other end of the leading-out pipeline is connected with one end of a fan, and the other end of the fan is connected with a secondary air chamber.
Further, the reaction tower is a deacidification and desulfurization reaction tower.
Further, the dust remover adopts a fibrous filter bag dust remover.
Compared with the prior art, the utility model, have following advantage and effect:
1. the utility model discloses a recirculated flue gas replaces partial overgrate air to make the interior inert gas content of combustion area increase, and the flue gas absorbs heat and has diluted the concentration of oxygen, and it is burnt with combustion-supporting air stretchs in high temperature low oxygen atmosphere, and the flame volume is multiplied and enlarged, has reduced local high-temperature area, and temperature distribution is more even, and this has not only inhibited the formation of heating power type NOx, also can make the coking problem of furnace improve; the steam generation amount is improved under a stable combustion environment, and the heat efficiency and the power generation amount are further improved;
2. the utility model sends the secondary air and the recirculated flue gas to the secondary air chamber through the flue gas recirculation fan, which saves the cost of one fan, and the secondary air takes air near the fan, and the pipeline arrangement is simple;
3. the secondary air of the utility model is hot air heated by the air preheater, and the spraying into the hearth can not cause too low local temperature, the temperature distribution of the hearth is uniform, and the combustion is more sufficient;
4. because the oxygen content in the flue gas is lower, in order to ensure the discharge capacity of CO, the recirculated flue gas volume must be increased, but a large amount of flue gas can cause the combustion temperature to be reduced, and incomplete combustion is increased, so that the supplemented flue gas volume can be reduced by adding one path of hot air, the combustion temperature is maintained, and complete combustion is ensured;
5. the utility model can reduce the excess air coefficient of the main combustion area by extracting the flue gas from the tail end of the grate of the incinerator, and the condition promotes the NOx reduction process and greatly reduces the generation of NOx; on the other hand, the speed of the flue gas in the lower hearth is reduced by extracting the flue gas at the tail end of the fire grate, so that the flying ash brought into the boiler is reduced, and the cost for cleaning the boiler and the flue is reduced.
Drawings
Fig. 1 is a schematic view of a flue gas recirculation system of a household garbage incineration power plant of the present invention.
Detailed Description
To elaborate on the technical solution adopted by the present invention for achieving the predetermined technical purpose, the technical solution in the embodiment of the present invention will be clearly and completely described below by combining with the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a partial embodiment of the present invention, not a whole embodiment, and technical means or technical features in the embodiment of the present invention can be replaced without paying creative efforts, and the present invention will be described in detail below by combining with the embodiments with reference to the drawings.
As shown in figure 1, the utility model discloses a flue gas recirculation system of domestic waste incineration power plant, contain and burn burning furnace 1, reaction tower 2, dust remover 3, draught fan 4, chimney 5 and air heater 6, burn the exhanst gas outlet and the 2 access connections of reaction tower of burning furnace 1, 2 exports of reaction tower are connected with 3 one end of dust remover, the 3 other ends of dust remover are connected with 4 one end of draught fan, the 4 other ends of draught fan are connected with chimney 5, 6 one ends of air heater let in the air, 6 other ends of air heater and the 4 other ends of draught fan are connected and are burnt burning furnace secondary plenum 7. The reaction tower 2 is a deacidification and desulfurization reaction tower. The dust remover 3 adopts a fibrous filter bag dust remover. High-temperature flue gas generated by combustion of the incinerator 1 passes through a plurality of heating surfaces, enters the reaction tower 2 for deacidification and desulfurization after being cooled, the temperature of the flue gas is further reduced, the flue gas discharged from the reaction tower 2 enters the dust remover 3, dust is collected through the fibrous filter bag, and the flue gas discharged from the dust remover 3 is guided to the chimney 5 by the induced draft fan 4. The content of inert gas in the combustion area is increased by replacing part of secondary air with the recirculated flue gas, the flue gas absorbs heat and dilutes the concentration of oxygen, and the flue gas and combustion air are spread and combusted in a high-temperature low-oxygen atmosphere, so that the flame volume is multiplied, a local high-temperature area is reduced, the temperature distribution is more uniform, the generation of thermal NOx is inhibited, and the coking problem of a hearth can be improved; the steam generation amount is improved under a stable combustion environment, and further the heat efficiency and the power generation amount are improved.
One end of an air preheater 6 is connected with one end of a cold air pipeline 8, the other end of the cold air pipeline 8 is filled with air, the other end of the air preheater 6 is connected with one end of a secondary air pipeline 9, the other end of the secondary air pipeline 9 is connected with one end of a flue gas recirculation fan 10, the other end of the flue gas recirculation fan 10 is connected with a secondary air chamber 7 through an outlet pipeline 11, and the secondary air chamber 7 is communicated with a hearth of an incinerator 1.
Wherein, the secondary air duct 9 is provided with a first damper 12. The other end of the induced draft fan 4 is connected with the secondary air pipeline 9 through a flue gas recirculation pipeline 13, and the connection position of the flue gas recirculation pipeline 13 and the secondary air pipeline 9 is located between the flue gas recirculation fan 10 and the first air damper 12. A second damper 14 is arranged on the flue gas recirculation duct 13.
And a flue gas recirculation pipeline 13 is led from the draught fan 4 to the chimney 5. The cold air pipeline 8 is connected to the inlet of the air preheater 6, the heated hot air is connected to the inlet of the flue gas recirculation fan 10 through the secondary air pipeline 9, the flue gas recirculation pipeline 13 is led to the secondary air pipeline 9 and is connected to the flue gas recirculation fan 10 together, and the flue gas recirculation fan 10 is connected to the secondary air chamber 7 of the incinerator through the outlet pipeline 11. By arranging the first damper 12 on the secondary air duct 9 and the second damper 14 on the flue gas recirculation duct 13, the distribution ratio of the recirculated flue gas amount and the secondary air amount can be controlled, and stable combustion is ensured. The secondary air and the recirculated flue gas are sent to the secondary air chamber through the flue gas recirculation fan, so that the cost of one fan is saved, the secondary air is taken out near the fan, and the pipeline arrangement is simple; the secondary air is hot air heated by the air preheater and is sprayed into the hearth, so that the local temperature cannot be too low, the temperature distribution of the hearth is uniform, and the combustion is more sufficient; because the oxygen content in the flue gas is lower, in order to guarantee the discharge capacity of CO, the amount of the recirculated flue gas must be increased, but a large amount of flue gas can cause the combustion temperature to be reduced and incomplete combustion to be increased, so that the amount of supplemented flue gas can be reduced by adding one path of hot air, the combustion temperature is maintained, and complete combustion is guaranteed.
The upper side of the tail end of the fire grate of the incinerator 1 is connected with one end of a leading-out pipeline 15, the other end of the leading-out pipeline 15 is connected with one end of a fan 16, and the other end of the fan 16 is connected with a secondary air chamber 7. A pipeline 15 is led from the tail end of the grate of the incinerator, and a part of flue gas with high oxygen content is also sent to a secondary air chamber through a fan 16. On one hand, the excess air coefficient of the main combustion zone can be reduced, and the condition promotes the NOx reduction process, so that the generation of NOx is greatly reduced; on the other hand, the speed of the flue gas in the lower hearth is reduced by extracting the flue gas at the tail end of the fire grate, so that the flying ash brought into the boiler is reduced, and the cost for cleaning the boiler and the flue is reduced.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the preferred embodiment, it is not intended to limit the present invention, and any person skilled in the art can make some changes or modifications to equivalent embodiments without departing from the scope of the present invention, and all those skilled in the art can make modifications or modifications equivalent embodiments without departing from the technical spirit of the present invention.
Claims (8)
1. The utility model provides a flue gas recirculation system of domestic waste incineration power plant which characterized in that: contain and burn burning furnace, reaction tower, dust remover, draught fan, chimney and air heater, burn the exhanst gas outlet and the reaction tower access connection of burning furnace, the reaction tower export is connected with dust remover one end, and the dust remover other end is connected with draught fan one end, and the draught fan other end is connected with the chimney, and air heater one end lets in the air, and the burning furnace secondary plenum is connected to the air heater other end and the draught fan other end.
2. The flue gas recirculation system of a domestic waste incineration power plant according to claim 1, characterized in that: one end of the air preheater is connected with one end of the cold air pipeline, the other end of the cold air pipeline is filled with air, the other end of the air preheater is connected with one end of a secondary air pipeline, the other end of the secondary air pipeline is connected with one end of a flue gas recirculation fan, the other end of the flue gas recirculation fan is connected with a secondary air chamber through an outlet pipeline, and the secondary air chamber is communicated with a furnace hearth of the incinerator.
3. The flue gas recirculation system of a domestic waste incineration power plant according to claim 2, characterized in that: and a first air adjusting door is arranged on the secondary air pipeline.
4. The flue gas recirculation system of a domestic waste incineration power plant according to claim 3, characterized in that: the other end of the draught fan is connected with the secondary air pipeline through a flue gas recirculation pipeline, and the connecting position of the flue gas recirculation pipeline and the secondary air pipeline is located between the flue gas recirculation fan and the first air adjusting door.
5. The flue gas recirculation system of a domestic waste incineration power plant according to claim 4, characterized in that: and a second air adjusting door is arranged on the smoke recirculation pipeline.
6. The flue gas recirculation system of a domestic waste incineration power plant according to claim 1, characterized in that: the upper side of the tail end of the fire grate of the incinerator is connected with one end of a leading-out pipeline, the other end of the leading-out pipeline is connected with one end of a fan, and the other end of the fan is connected with a secondary air chamber.
7. The flue gas recirculation system of a domestic waste incineration power plant according to claim 1, characterized in that: the reaction tower is a deacidification and desulfurization reaction tower.
8. The flue gas recirculation system of a domestic waste incineration power plant according to claim 1, characterized in that: the dust remover adopts a fibrous filter bag dust remover.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121442533.7U CN217423262U (en) | 2021-06-28 | 2021-06-28 | Flue gas recirculation system of household garbage incineration power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121442533.7U CN217423262U (en) | 2021-06-28 | 2021-06-28 | Flue gas recirculation system of household garbage incineration power plant |
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| CN202121442533.7U Active CN217423262U (en) | 2021-06-28 | 2021-06-28 | Flue gas recirculation system of household garbage incineration power plant |
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