CN216010865U - Waste incineration power plant gas cleaning energy-saving synergistic system - Google Patents

Waste incineration power plant gas cleaning energy-saving synergistic system Download PDF

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Publication number
CN216010865U
CN216010865U CN202122489601.1U CN202122489601U CN216010865U CN 216010865 U CN216010865 U CN 216010865U CN 202122489601 U CN202122489601 U CN 202122489601U CN 216010865 U CN216010865 U CN 216010865U
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flue gas
primary
gas cooler
heat exchanger
pipeline
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CN202122489601.1U
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张卫峰
潘诚
何垚
姚瑶
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Powerchina Central China Electric Power Engineering Corp ltd
Powerchina Henan Electric Power Survey & Design Institute Co ltd
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Powerchina Central China Electric Power Engineering Corp ltd
Powerchina Henan Electric Power Survey & Design Institute Co ltd
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Abstract

A flue gas purification energy-saving synergistic system of a garbage incineration power station comprises a primary fan, wherein the primary fan is communicated with a primary air preheater, an air duct between the outlet of the primary fan and the primary air preheater is provided with an air heater, and the primary air preheater is sequentially communicated with an incinerator, a waste heat boiler, a semi-dry reaction tower, a bag-type dust collector, a No. 1 flue gas heat exchanger, a No. 2 flue gas heat exchanger and a chimney through a flue gas duct; a primary flue gas cooler is arranged on a flue between the waste heat boiler and the semi-dry method reaction tower, a secondary flue gas cooler is arranged on a flue between the No. 1 flue gas heat exchanger and the wet type washing tower, and a tertiary flue gas cooler is arranged on a flue between the No. 2 flue gas heat exchanger and the chimney; the inlet water of the flue gas cooler is all taken from condensed water. The utility model discloses can reduce gas cleaning device entry flue gas temperature, improve gas cleaning device efficiency, reduce desuperheating water consumption and draught fan power consumption, can also realize the recycle to flue gas waste heat, improve waste incineration generating heat efficiency.

Description

Waste incineration power plant gas cleaning energy-saving synergistic system
Technical Field
The utility model belongs to the technical field of msw incineration power generation, concretely relates to msw incineration power plant gas cleaning energy-saving synergy system.
Background
In 2010 to 2020, the cleaning and transporting amount of urban domestic garbage in China is increased from 1.58 hundred million tons to 2.65 hundred million tons. The waste incineration power generation technology has the advantages of large treatment capacity, energy regeneration, harmlessness, good volume reduction and quality reduction effects and the like, and becomes a treatment technology encouraged by the nation. The conventional flue gas purification system of the garbage power plant adopts 'SNCR + semi-dry deacidification + activated carbon injection + dry deacidification + bag-type dust remover', the requirements on the emission of atmospheric pollutants are increasingly strict with the implementation of an atmospheric pollution control plan, and a wet washing tower and a low-temperature SCR system are additionally arranged on the original flue gas purification system of part of the garbage power plants at present. In the gas cleaning process, flue gas temperature is too high, can cause the waste of flue gas waste heat on the one hand, and the actual flue gas volume flow grow of on the other hand is unfavorable for purifier to deviating from of pollutant, has also increased the power consumption of draught fan. In addition, partial purification equipment has the restriction to entry flue gas temperature, and the flue gas temperature is too high and needs to spray water and reduce the temperature, has caused the waste of water resource and heat. Although the inlet and outlet of the low-temperature SCR system are provided with flue gas heat exchangers in the wet scrubber tower, the above problems cannot be solved well.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: how to improve the waste incineration power generation thermal efficiency in the waste incineration power station flue gas purification process provides a waste incineration power station flue gas purification energy-saving synergistic system.
The technical scheme of the utility model specifically does:
a flue gas purification energy-saving synergistic system of a waste incineration power station comprises a primary fan, wherein the input of the primary fan is air from a waste pit, the primary fan is communicated with a primary air pre-heater, a fan heater is arranged on an air channel between the outlet of the primary fan and the primary air pre-heater, and the primary air pre-heater is sequentially communicated with an incinerator, a waste heat boiler, a semi-dry reaction tower, a bag-type dust remover, a No. 1 flue gas heat exchanger, a No. 2 flue gas heat exchanger and a chimney through a flue gas air channel; the No. 1 flue gas heat exchanger is connected with the wet washing tower, and the No. 2 flue gas heat exchanger is connected with the low-temperature SCR system; a primary flue gas cooler is arranged on a flue between the waste heat boiler and the semi-dry method reaction tower, a secondary flue gas cooler is arranged on a flue between the No. 1 flue gas heat exchanger and the wet type washing tower, and a tertiary flue gas cooler is arranged on a flue between the No. 2 flue gas heat exchanger and the chimney; the water inlet of the first-stage flue gas cooler, the second-stage flue gas cooler and the third-stage flue gas cooler is all taken from condensed water.
The system also comprises a steam turbine, wherein hot steam of the steam turbine enters a condenser, and the condenser is sequentially communicated with a low-pressure heater and a deaerator through a pipeline; a condensed water input pipeline I is connected to a pipeline between the condenser and the low-pressure heater, a condensed water input pipeline II is connected to a pipeline between the low-pressure heater and the deaerator, the condensed water input pipeline I and the condensed water input pipeline II are mixed and then pass through a circulating pump, the output end of the circulating pump is connected with two output pipelines, and the output pipeline I is sequentially communicated with a primary flue gas cooler and a heater and then is connected with a pipeline between the low-pressure heater and the condenser; the output pipeline II is sequentially communicated with the second-stage flue gas cooler and the third-stage flue gas cooler and then is connected with the pipeline between the low-pressure heater and the deaerator.
And control valves are arranged on pipelines at the inlet and the outlet of the circulating pump.
The first-stage flue gas cooler, the second-stage flue gas cooler and the third-stage flue gas cooler are made of ND steel, and the air heater is made of steel-aluminum composite pipes.
The utility model has the advantages that: the system can reduce the inlet flue gas temperature of the flue gas purification device, improve the efficiency of the flue gas purification device, reduce the water consumption of the desuperheating water and the power consumption of the draught fan, realize the recycling of the flue gas waste heat, reduce the steam consumption of the primary air preheater and the deaerator, and improve the thermal efficiency of waste incineration power generation.
Drawings
FIG. 1 is a schematic structural view of the flue gas purification, energy saving and efficiency increasing system of the waste incineration power station of the utility model.
In the figure, 1 is a steam turbine, 2 is an incinerator, 3 is a waste heat furnace, 4 is a condenser, 5 is a low-pressure heater, 6 is a deaerator, 7 is a primary air fan, 8 is a fan heater, 9 is a primary air preheater, 10 is a primary flue gas cooler, 11 is a semi-dry process reaction tower, 12 is a bag-type dust remover, 13 is a No. 1 flue gas heat exchanger, 14 is a secondary flue gas cooler, 15 is a wet washing tower, 16 is a No. 2 flue gas heat exchanger, 17 is a low-temperature SCR system, 18 is a tertiary flue gas cooler, 19 is a chimney, and 20 is a circulating pump.
Detailed Description
The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.
As shown in fig. 1, the flue gas purification energy-saving synergistic system of the waste incineration power station comprises a primary air fan 7, wherein the input of the primary air fan 7 is air from a waste pit, the primary air fan 7 is communicated with a primary air preheater 9, an air heater 8 is arranged on an air channel between the outlet of the primary air fan 7 and the primary air preheater 9, and the primary air preheater 9 is sequentially communicated with an incinerator 2, a waste heat boiler 3, a semidry reaction tower 11, a bag-type dust collector 12, a flue gas heat exchanger 1, a flue gas heat exchanger 2 and a chimney 19 through a flue gas channel. Wherein, the No. 1 flue gas heat exchanger 13 is connected with a wet type washing tower 15, and the No. 2 flue gas heat exchanger 16 is connected with a low-temperature SCR system 17; a first-stage flue gas cooler 10 is arranged on a flue between the waste heat boiler 3 and the semi-dry method reaction tower 11, a second-stage flue gas cooler 14 is arranged on a flue between the No. 1 flue gas heat exchanger 13 and the wet type washing tower 15, and a third-stage flue gas cooler 18 is arranged on a flue between the No. 2 flue gas heat exchanger 16 and a chimney 19.
It should be noted that the inlet water of the primary flue gas cooler 10, the secondary flue gas cooler 14, and the tertiary flue gas cooler 18 is taken from condensed water. Specifically, hot steam of the steam turbine 1 enters a condenser 4, and the condenser 4 is sequentially communicated with a low-pressure heater 5 and a deaerator 6 through a pipeline. The inlet water of the first-stage flue gas cooler 10, the second-stage flue gas cooler 14 and the third-stage flue gas cooler 18 is taken from condensed water at the inlet and the outlet of the low-pressure heater 5. A condensed water input pipeline I21 is connected to a pipeline between the condenser 4 and the low-pressure heater 5, a condensed water input pipeline II 22 is connected to a pipeline between the low-pressure heater 5 and the deaerator 6, the condensed water input pipeline I21 and the condensed water input pipeline II 22 are mixed and then pass through the circulating pump 20, the output end of the circulating pump 20 is connected with two output pipelines, and the output pipeline I23 is connected with the pipeline between the low-pressure heater 5 and the condenser 4 after being sequentially communicated with the primary flue gas cooler 10 and the heater 8. The output pipeline II 24 is sequentially communicated with the second-stage flue gas cooler 14 and the third-stage flue gas cooler 18 and then is connected with the pipeline between the low-pressure heater 5 and the deaerator 6.
Furthermore, the inlet and outlet pipes of the circulation pump 20 are provided with control valves 25.
Further, the primary flue gas cooler 10, the secondary flue gas cooler 14 and the tertiary flue gas cooler 18 are made of ND steel, and the air heater 8 is made of steel-aluminum composite pipes.
The working process of the waste incineration power station flue gas purification energy-saving synergistic system is as follows:
as shown in fig. 1, air from a garbage pit is sent into an incinerator 2 after passing through a primary air fan 7, an air heater 8 and a primary air preheater 9, and flue gas generated by the incinerator 2 sequentially passes through a waste heat boiler 3, a primary flue gas cooler 10, a semidry method reaction tower 11, a bag-type dust collector 12, a No. 1 flue gas heat exchanger 13, a secondary flue gas cooler 14, a wet washing tower 15, a No. 2 flue gas heat exchanger 16, a low-temperature SCR17, a tertiary flue gas cooler 18 and a chimney 19; the exhaust of the steam turbine 1 is condensed by the condenser 4, passes through the condensed water pipeline, and enters the deaerator 6 through the low-pressure heater 5.
The flue gas passes through the cooler and carries out the heat exchange with the circulating water that comes from the condensate pipe at the in-process that the flue gas flows, and the concrete process is: a condensed water input pipeline I21 and a condensed water input pipeline II 22 are respectively led out from an inlet and an outlet of the low-pressure heater 5, mixed and then pass through a circulating pump 20, an output pipeline I23 passes through a primary flue gas cooler 10, the heat of flue gas is absorbed, the temperature of the flue gas is reduced, then the flue gas enters a fan heater 8 to heat primary air, and finally the primary air returns to a pipeline between the low-pressure heater 5 and the condenser 4; the other output pipeline II 24 passes through the secondary flue gas cooler 14 and the tertiary flue gas cooler 18 in sequence, absorbs the heat of the flue gas and is connected with the pipeline between the low-pressure heater 5 and the deaerator 6. The flue gas circulating water absorbs the heat released by the high-temperature flue gas, one part of the flue gas circulating water is used for heating the primary air, and the other part of the flue gas circulating water is used for increasing the temperature of the condensed water.
This process not only can reduce the flue gas temperature, improves flue gas purification device efficiency, reduces desuperheating water consumption and draught fan power consumption, can also realize the recycle to the flue gas waste heat, reduces the steam consumption of air preheater 9 and oxygen-eliminating device 6, improves msw incineration generating heat efficiency.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical solutions of the present invention, and it should be noted that, further improvements and changes can be made by those skilled in the art based on the technical solutions of the present invention, and all such improvements and changes should be covered in the protection scope of the present invention.

Claims (4)

1. A waste incineration power station flue gas purification energy-saving synergistic system comprises a primary fan (7), wherein the input of the primary fan (7) is air from a garbage pit, the primary fan (7) is communicated with a primary air preheater (9), an air duct between the outlet of the primary fan (7) and the primary air preheater (9) is provided with an air heater (8), and the primary air preheater (9) is sequentially communicated with an incinerator (2), a waste heat boiler (3), a semi-dry reaction tower (11), a bag-type dust collector (12), a No. 1 flue gas heat exchanger (13), a No. 2 flue gas heat exchanger (16) and a chimney (19) through a flue gas duct; wherein, the No. 1 flue gas heat exchanger (13) is connected with a wet type washing tower (15), and the No. 2 flue gas heat exchanger (16) is connected with a low-temperature SCR system (17); the method is characterized in that: a primary flue gas cooler (10) is arranged on a flue between the waste heat boiler (3) and the semi-dry method reaction tower (11), a secondary flue gas cooler (14) is arranged on a flue between the No. 1 flue gas heat exchanger (13) and the wet type washing tower (15), and a tertiary flue gas cooler (18) is arranged on a flue between the No. 2 flue gas heat exchanger (16) and the chimney (19); the inlet water of the first-stage flue gas cooler (10), the second-stage flue gas cooler (14) and the third-stage flue gas cooler (18) is all taken from condensed water.
2. The waste incineration power station flue gas purification energy-saving efficiency-increasing system according to claim 1, characterized in that: the steam turbine is characterized by further comprising a steam turbine (1), hot steam of the steam turbine (1) enters a condenser (4), and the condenser (4) is sequentially communicated with a low-pressure heater (5) and a deaerator (6) through pipelines; a condensed water input pipeline I (21) is connected to a pipeline between the condenser (4) and the low-pressure heater (5), a condensed water input pipeline II (22) is connected to a pipeline between the low-pressure heater (5) and the deaerator (6), the condensed water input pipeline I (21) and the condensed water input pipeline II (22) are mixed and then pass through a circulating pump (20), the output end of the circulating pump (20) is connected with two output pipelines, and the output pipeline I (23) is connected with a pipeline between the low-pressure heater (5) and the condenser (4) after being sequentially communicated with a primary flue gas cooler (10) and a heater (8); the output pipeline II (24) is sequentially communicated with the secondary flue gas cooler (14) and the tertiary flue gas cooler (18) and then is connected with the pipeline between the low-pressure heater (5) and the deaerator (6).
3. The waste incineration power station flue gas purification energy-saving efficiency-increasing system according to claim 1, characterized in that: the pipelines of the inlet and the outlet of the circulating pump (20) are provided with control valves (25).
4. The waste incineration power station flue gas purification energy-saving efficiency-increasing system according to claim 1, characterized in that: the primary flue gas cooler (10), the secondary flue gas cooler (14) and the tertiary flue gas cooler (18) are made of ND steel, and the air heater (8) is made of steel-aluminum composite pipes.
CN202122489601.1U 2021-10-15 2021-10-15 Waste incineration power plant gas cleaning energy-saving synergistic system Active CN216010865U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202122489601.1U CN216010865U (en) 2021-10-15 2021-10-15 Waste incineration power plant gas cleaning energy-saving synergistic system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202122489601.1U CN216010865U (en) 2021-10-15 2021-10-15 Waste incineration power plant gas cleaning energy-saving synergistic system

Publications (1)

Publication Number Publication Date
CN216010865U true CN216010865U (en) 2022-03-11

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