CN111895442A - Flue gas treatment system of power plant - Google Patents

Flue gas treatment system of power plant Download PDF

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Publication number
CN111895442A
CN111895442A CN201910369371.XA CN201910369371A CN111895442A CN 111895442 A CN111895442 A CN 111895442A CN 201910369371 A CN201910369371 A CN 201910369371A CN 111895442 A CN111895442 A CN 111895442A
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CN
China
Prior art keywords
air
flue gas
air heater
power plant
treatment system
Prior art date
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Pending
Application number
CN201910369371.XA
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Chinese (zh)
Inventor
王键
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing Shangshun Heat Transfer Equipment Co ltd
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Chongqing Shangshun Heat Transfer Equipment Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Chongqing Shangshun Heat Transfer Equipment Co ltd filed Critical Chongqing Shangshun Heat Transfer Equipment Co ltd
Priority to CN201910369371.XA priority Critical patent/CN111895442A/en
Publication of CN111895442A publication Critical patent/CN111895442A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00Heating of air supplied for combustion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/025Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/20Sulfur; Compounds thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00Intercepting solids
    • F23J2217/10Intercepting solids by filters
    • F23J2217/102Intercepting solids by filters electrostatic
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The invention provides a flue gas treatment system for a power plant, which comprises a flue gas path formed by sequentially connecting a boiler, a rotary air preheater, a flue gas air heater, an induced draft fan, a desulfurizing tower and a chimney, wherein the flue gas air heater adopts air as a cooling medium, the air is introduced into the flue gas air heater and exchanges heat with flue gas flowing through the flue gas air heater, medium-temperature air obtained by heat exchange is introduced into the rotary air preheater and exchanges heat with the flue gas flowing through the rotary air preheater, a first part of hot air obtained by heat exchange is introduced into the boiler as a heat source, and a second part of hot air obtained by heat exchange is recycled as a part of the cooling medium of the flue gas air heater after being cooled by the heat exchange. The invention thoroughly solves the problems of low-temperature corrosion and ammonium bisulfate blockage of the rotary air preheater, can ensure long-term safe and economic operation of the air preheater, reduces the maintenance and operation cost, and has good controllability and flexible operation.

Description

Flue gas treatment system of power plant
Technical Field
The invention relates to a coal-fired boiler system of a power plant, in particular to a flue gas treatment system of the power plant.
Background
After ultra-clean emission is reformed transform, a series of problems such as low-temperature corrosion, ammonium bisulfate blockage, high exhaust gas temperature and the like generally exist in the air preheater of the power plant, the proportion occupied by the exhaust gas heat loss is also very large, and in order to solve the series of problems existing in the air preheater and fully utilize the part of energy, a special process technology is needed to be adopted, and the problems are solved systematically. In order to realize the recovery of the waste heat of the boiler, various devices and systems are allowed. The boiler flue gas waste heat recovery system as disclosed in CN205807452U includes: an air preheater arranged at the tail part of the boiler; the temperature sensor is arranged on the smoke exhaust pipeline and is positioned at the outlet of the air preheater; a waste heat recoverer connected with the air preheater through the smoke exhaust pipeline; also, as disclosed in CN104006401A, the deep recycling and emission reduction system for flue gas waste heat of power plant boiler comprises an air preheater, a dust remover, an induced draft fan, a booster fan, a desulfurizing tower, a chimney and an overfire fan, which are connected in series in turn to a flue of the boiler, wherein an output end of the overfire fan is connected to an air input end of the boiler through the air preheater, the system further comprises a first low temperature heat exchanger, a second low temperature heat exchanger, an air heat exchanger and a first water pump, the first low temperature heat exchanger is arranged between the air preheater and the dust remover, the second low temperature heat exchanger is arranged between the booster fan and the desulfurizing tower, the air heat exchanger is arranged between the overfire fan and the air preheater, an output end of a heat exchange medium of the air heat exchanger is connected to an input end of a heat exchange medium of the second low temperature heat, the heat exchange medium output end of the first low-temperature heat exchanger is connected with the heat exchange medium input end of the air heat exchanger. Although the systems can realize waste heat recycling to a certain extent, the systems cannot systematically solve the series problems of low-temperature corrosion, ammonium bisulfate blockage and the like of the air preheater, the devices also have the problems of easy dust accumulation, scaling, abrasion and the like, and the water medium heat exchanger also has the problems of large leakage risk, high maintenance and operation cost and the like.
Disclosure of Invention
The invention aims to provide a power plant flue gas treatment system which does not need an intermediate heat transfer medium, has good controllability, high safety and reliability and high economical efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme.
The utility model provides a flue gas processing system of power plant, including mainly by the boiler, rotary air heater, flue gas air heater, the draught fan, the smoke circuit that desulfurizing tower and chimney formed by connecting in order, flue gas air heater adopts the air as the cold media, the air is introduced flue gas air heater and carries out the heat transfer with the flue gas that flows through flue gas air heater, the well warm braw that the heat transfer obtained is introduced rotary air heater, well warm braw carries out the heat transfer with the flue gas that flows through rotary air heater, the first part hot-blast quilt that the heat transfer obtained is introduced in the boiler as the heat source, the hot-blast part cold media cyclic utilization as flue gas air heater after the heat transfer gained second part is cooled.
Further, the air quantity used for the flue gas air heater is increased by 10% -20% compared with the air quantity required by combustion of the boiler.
Furthermore, a hot air outlet of the rotary air preheater is respectively connected with a boiler and a heat exchanger of a heat supply system, the heat exchanger is connected with an adjusting valve for controlling the air quantity, and the adjusting valve is connected with a cold medium introducing system of the smoke air heater.
Further, the cold medium introducing system of the flue gas air heater comprises an air channel and a first air feeder arranged on the air channel, when the first air feeder cannot meet the resistance requirement of the flue gas treatment system, a second air feeder is arranged on the air channel, and the first air feeder and the second air feeder are connected in series.
Further, the outlet of the regulating valve is connected with an air channel on the inlet side of the second blower.
Furthermore, the smoke air heater adopts a three-dimensional pipe air heater.
Further, the temperature of the medium temperature wind is 80-120 ℃.
Preferably, an electrostatic dust collector is arranged between the flue gas air heater and the induced draft fan.
Preferably, an electric bag dust collector is arranged between the rotary air preheater and the flue gas air heater.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: the invention can improve the temperature of inlet air entering the rotary air preheater to 80-120 ℃, so that the temperature of the lowest metal wall of a heat exchange plate of the rotary air preheater can reach more than 120 ℃, and the ammonium bisulfate deposited on the surface of the heat exchanger has enough time to dry-fire on the high-temperature flue gas side, so that the ammonium bisulfate is evaporated and decomposed, thereby thoroughly solving the problems of low-temperature corrosion and ammonium bisulfate blockage of the rotary air preheater, ensuring the long-term safe and economic operation of the air preheater, and reducing the maintenance and operation cost; the invention realizes gradient heat exchange by circularly utilizing incremental air, fully utilizes the three-dimensional tubular air heater to enhance heat exchange, reduces the volume of the heat exchanger, is beneficial to field arrangement, not only effectively solves the problems of low-temperature corrosion and the like easily appearing in a flue gas treatment system of a power plant, but also has good controllability and more flexible operation; the smoke air heater provided by the invention not only heats air, realizes the function of a steam air heater, but also reduces the smoke temperature (the smoke exhaust temperature of the smoke air heater can be reduced to 90-115 ℃), realizes the function of a low-temperature economizer, directly replaces the steam air heater and the low-temperature economizer, has high safety reliability and economy, does not need to adopt water as an intermediate heat transfer medium, and thoroughly eliminates the corrosion risk of water leakage in a heat medium water heat exchanger; the invention fully utilizes the heat accumulating type heat exchange principle of the rotary air preheater, further improves the temperature of hot air and improves the combustion efficiency in the boiler; the invention can realize the synergistic dust removal, reduce the water consumption of the desulfurization process, reduce the temperature and the water content of clean flue gas at the outlet of the desulfurization tower, improve the desulfurization and dust removal efficiency of the desulfurization device, reduce the white smoke degree of a chimney, realize the waste heat recovery and obviously reduce the energy consumption of a power plant; the system is simple, the investment is small, the corrosion cannot be rapidly enlarged even if the heat exchanger generates air leakage, the smoke is not polluted, the safety and the reliability are extremely high, the daily maintenance is avoided, the low-cost rapid maintenance and tube replacement are convenient, the operation and maintenance cost is low, the self-adaptive load change is realized, the winter frost crack risk is avoided, and the system is extremely favorable for the technical improvement of a newly-built power plant and a power plant; the invention adopts high-temperature hot air to heat water or steam, can eliminate the risks of corrosion, dust deposition and abrasion of the conventional flue gas heat medium water heat exchanger, reduce the wall thickness of a heat exchange pipe, lighten the weight of the heat exchanger, reduce the manufacturing cost of equipment, is suitable for heating heat exchange media with various temperature grades, and has no requirement that the conventional flue gas heat medium water heat exchanger has no lower than 70 ℃ of inlet water temperature.
Drawings
FIG. 1 is a schematic view of a flue gas treatment system of a power plant in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of a flue gas treatment system of a power plant in embodiment 2 of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the following embodiments are only used for understanding the principle of the present invention and the core idea thereof, and do not limit the scope of the present invention. It should be noted that modifications to the invention as described herein, which do not depart from the principles of the invention, are intended to be within the scope of the claims which follow.
Example 1
A flue gas treatment system of a power plant is shown in figure 1 and comprises a flue gas path which is formed by sequentially connecting a boiler 1, a rotary air preheater 2, a flue gas air heater 4, an induced draft fan 5, a desulfurizing tower 6 and a chimney 8, wherein the flue gas air heater 4 adopts air as a cooling medium, the air is introduced into the flue gas air heater 4 and exchanges heat with flue gas flowing through the flue gas air heater 4, medium-temperature air obtained through heat exchange is introduced into the rotary air preheater 2 and exchanges heat with the flue gas flowing through the rotary air preheater 2, a first part of hot air obtained through heat exchange is introduced into the boiler 1 as a heat source, and a second part of hot air obtained through heat exchange is cooled by heat exchange and then serves as a part of the cooling medium of the flue gas air heater 4.
Wherein, the air quantity used for the flue gas air heater 4 is increased by 10-20% compared with the air quantity required by the combustion of the boiler. The increased air quantity is used for absorbing the waste heat of the flue gas, the temperature of the flue gas can be reduced to 85-120 ℃, all air is heated to about 300 ℃ (the temperature of the heated air is 15-40 ℃ lower than the temperature of the flue gas at the inlet of the rotary air preheater 2), the first part of hot air (namely the air quantity required by combustion of the boiler) obtained by heat exchange is introduced into the boiler to be used as a heat source, and the second part of hot air (the increased air quantity) obtained by heat exchange is cooled by heat exchange (by heat exchange of media such as water or steam) and then is used as part of hot media of the flue gas air heater for recycling.
Wherein, the hot air outlet of the rotary air preheater 2 is respectively connected with the boiler 1 and the heat exchanger 10 of the heating system, the heat exchanger 10 is connected with the regulating valve 11 for controlling the air quantity, the regulating valve 11 is connected with the cold medium introducing system of the flue gas air heater 4, namely, the inlet of the regulating valve 11 is connected with the hot medium outlet of the heat exchanger 10 of the heating system, and the outlet of the regulating valve 11 is connected with the cold medium introducing system.
Wherein, the cold medium introducing system of the flue gas air heater 4 comprises an air duct 7 and a first blower 12 arranged on the air duct 7, when the first blower 12 can not meet the system resistance requirement (under the normal condition, the blower has a flow and a full pressure margin of 20 percent respectively), a second blower 13 is arranged on the air duct 7, and the first blower 12 and the second blower 13 are arranged in series. In the present embodiment, the first blower 12 is located between the flue gas heater 4 and the second blower 13, and the arrangement can overcome the system resistance.
Wherein, the regulating valve 11 is connected with the air duct 7 at the inlet side of the second blower 13.
Wherein, the flue gas air heater 4 adopts a three-dimensional tubular air heater.
Wherein the temperature of the medium temperature wind is 80-120 ℃.
Wherein, an electrostatic dust collector 9 is arranged between the smoke air heater 4 and the induced draft fan 5.
Example 2
A flue gas treatment system of a power plant is shown in figure 2 and comprises a flue gas path which is formed by sequentially connecting a boiler 1, a rotary air preheater 2, a flue gas air heater 4, an induced draft fan 5, a desulfurizing tower 6 and a chimney 8, wherein the flue gas air heater 4 adopts air as a cooling medium, the air is introduced into the flue gas air heater 4 and exchanges heat with flue gas flowing through the flue gas air heater 4, medium-temperature air obtained through heat exchange is introduced into the rotary air preheater 2 and exchanges heat with the flue gas flowing through the rotary air preheater 2, a first part of hot air obtained through heat exchange is introduced into the boiler 1 as a heat source, and a second part of hot air obtained through heat exchange is cooled by heat exchange and then serves as a part of the cooling medium of the flue gas air heater 4.
Wherein, the air quantity used for the flue gas air heater 4 is increased by 10-20% compared with the air quantity required by the combustion of the boiler. The increased air quantity is used for absorbing the waste heat of the flue gas, the temperature of the flue gas can be reduced to 85-120 ℃, all air is heated to about 300 ℃ (the temperature of the heated air is 15-40 ℃ lower than the temperature of the flue gas at the inlet of the rotary air preheater 2), the first part of hot air (namely the air quantity required by combustion of the boiler) obtained by heat exchange is introduced into the boiler to be used as a heat source, and the second part of hot air (the increased air quantity) obtained by heat exchange is cooled by heat exchange (by heat exchange of media such as water or steam) and then is used as part of hot media of the flue gas air heater for recycling.
Wherein, the hot air outlet of the rotary air preheater 2 is respectively connected with the boiler 1 and the heat exchanger 10 of the heating system, the heat exchanger 10 is connected with the regulating valve 11 for controlling the air quantity, the regulating valve 11 is connected with the cold medium introducing system of the flue gas air heater 4, namely, the inlet of the regulating valve 11 is connected with the hot medium outlet of the heat exchanger 10 of the heating system, and the outlet of the regulating valve 11 is connected with the cold medium introducing system.
Wherein, the cold medium introducing system of the flue gas air heater 4 comprises an air duct 7 and a first blower 12 arranged on the air duct 7, when the first blower 12 can not meet the system resistance requirement (under the normal condition, the blower has a flow and a full pressure margin of 20 percent respectively), a second blower 13 is arranged on the air duct 7, and the first blower 12 and the second blower 13 are arranged in series. In the present embodiment, the first blower 12 is located between the flue gas heater 4 and the second blower 13. The system resistance can be overcome by adopting the serial arrangement mode.
Wherein, the regulating valve 11 is connected with the air duct 7 at the inlet side of the second blower 13.
Wherein, the flue gas air heater 4 adopts a three-dimensional tubular air heater.
Wherein the temperature of the medium temperature wind is 80-120 ℃.
Wherein, an electric bag dust collector 3 is arranged between the rotary air preheater 2 and the smoke air heater 4.
As shown in fig. 1, raw flue gas discharged from a boiler 1 sequentially flows through a rotary air preheater 2, a flue gas air heater 4, an electrostatic dust collector, an induced draft fan 5, a desulfurizing tower 6 and a chimney 8; or as shown in fig. 2, the raw flue gas discharged from the boiler 1 sequentially flows through a rotary air preheater 2, an electric bag dust remover 9, a flue gas air heater 4, an induced draft fan 5, a desulfurizing tower 6 and a chimney 8; a proper amount of mixed air (consisting of ambient air and warm air subjected to heat exchange by a heat exchanger 10 of a heat supply system) is introduced into a flue gas air heater 4 by a blower, the mixed air and the flue gas in the flue gas air heater 4 perform primary heat exchange, the medium-temperature air (with the temperature of 80-120 ℃) obtained by the heat exchange is introduced into a rotary air preheater 2, the medium-temperature air and the flue gas in the rotary air preheater 2 perform secondary heat exchange, a first part of hot air (with the temperature of 280-.
In the operation process, the system increases the temperature of inlet air entering the rotary air preheater to 80-120 ℃, so that the temperature of the lowest metal wall of a heat exchange plate of the rotary air preheater can reach more than 120 ℃, the ammonium bisulfate deposited on the surface of the heat exchanger has enough time to dry-fire on the high-temperature flue gas side, the ammonium bisulfate is evaporated and decomposed, the problems of low-temperature corrosion and ammonium bisulfate blockage of the rotary air preheater are thoroughly solved, the long-term safe and economic operation of the air preheater is ensured, and the maintenance and operation cost is reduced; gradient heat exchange is realized by recycling incremental air, heat exchange is enhanced by fully utilizing the three-dimensional tubular air heater, the volume of the heat exchanger is reduced, field arrangement is facilitated, the problems of low-temperature corrosion and the like easily occurring in a flue gas treatment system of a power plant are effectively solved, and the flue gas treatment system is good in controllability and more flexible to operate; the smoke air heater not only heats air, realizes the function of a steam air heater, but also reduces the smoke temperature (the smoke discharge temperature of the smoke air heater can be reduced to 90-115 ℃, the smoke discharge temperature of the air heater of the existing smoke treatment system is about 150 ℃), realizes the function of a low-temperature economizer, directly replaces the steam air heater and the low-temperature economizer, has high safety reliability and economy, does not need to adopt water as an intermediate heat transfer medium, and thoroughly eliminates the corrosion risk of water leakage of a heat medium water heat exchanger. The invention fully utilizes the heat accumulating type heat exchange principle of the rotary air preheater, further improves the temperature of hot air and improves the combustion efficiency in the boiler; the invention can realize the synergistic dust removal, reduce the water consumption of the desulfurization process, reduce the temperature and the water content of clean flue gas at the outlet of the desulfurization tower, improve the desulfurization and dust removal efficiency of the desulfurization device, reduce the white smoke degree of a chimney, realize the waste heat recovery and obviously reduce the energy consumption of a power plant; the system is simple, the investment is small, the corrosion cannot be rapidly enlarged even if the heat exchanger generates air leakage, the smoke is not polluted, the safety and the reliability are extremely high, the daily maintenance is avoided, the low-cost rapid maintenance and tube replacement are convenient, the operation and maintenance cost is low, the self-adaptive load change is realized, the winter frost crack risk is avoided, and the system is extremely favorable for the technical improvement of a newly-built power plant and a power plant; the invention adopts high-temperature hot air to heat water or steam, can eliminate the risks of corrosion, dust deposition and abrasion of the conventional flue gas heat medium water heat exchanger, reduce the wall thickness of a heat exchange pipe, lighten the weight of the heat exchanger, reduce the manufacturing cost of equipment, is suitable for heating heat exchange media with various temperature grades, and has no requirement that the conventional flue gas heat medium water heat exchanger has no lower than 70 ℃ of inlet water temperature.

Claims (10)

1. The utility model provides a flue gas processing system of power plant which characterized in that: the flue gas heat exchanger comprises a boiler (1), a rotary air preheater (2), a flue gas air heater (4), an induced draft fan (5), a smoke path formed by sequentially connecting a desulfurizing tower (6) and a chimney (8), wherein the flue gas air heater (4) adopts air as a cooling medium, the air is introduced into the flue gas air heater (4) and exchanges heat with flue gas flowing through the flue gas air heater (4), medium-temperature air obtained by heat exchange is introduced into the rotary air preheater (2), the medium-temperature air exchanges heat with the flue gas flowing through the rotary air preheater (2), first part hot air obtained by heat exchange is introduced into the boiler (1) as a heat source, and second part hot air obtained by heat exchange is recycled as part of the cooling medium of the flue gas air heater (4) after being cooled by the heat exchange.
2. The power plant flue gas treatment system of claim 1, wherein: the air quantity used for the flue gas air heater (4) is increased by 10-20% compared with the air quantity required by combustion of the boiler (1).
3. The power plant flue gas treatment system of claim 2, wherein: the hot air outlet of the rotary air preheater (2) is respectively connected with the boiler (1) and a heat exchanger (10) of a heat supply system, the heat exchanger (10) is connected with a regulating valve (11) for controlling the air volume, and the regulating valve (11) is connected with a cold medium introducing system of the smoke air heater (4).
4. The power plant flue gas treatment system of claim 3, wherein: the cold medium introducing system of the flue gas air heater (4) comprises an air duct (7) and a first air feeder (12) arranged on the air duct (7), when the first air feeder (12) cannot meet the resistance requirement of the flue gas treatment system, a second air feeder (13) is arranged on the air duct (7), and the first air feeder (12) and the second air feeder (13) are connected in series.
5. The power plant flue gas treatment system of claim 4, wherein: the outlet of the regulating valve (11) is connected with an air channel (7) at the inlet side of the second blower (13).
6. The power plant flue gas treatment system of claim 5, wherein: the smoke air heater (4) adopts a three-dimensional tubular air heater.
7. The power plant flue gas treatment system of claim 6, wherein: the temperature of the medium temperature air is 80-120 ℃.
8. A power plant flue gas treatment system according to any of claims 1 to 7, characterized in that: an electrostatic dust collector (9) is arranged between the smoke air heater (4) and the induced draft fan (5).
9. A power plant flue gas treatment system according to any of claims 1 to 7, characterized in that: an electric bag dust collector (3) is arranged between the rotary air preheater (2) and the flue gas air heater (4).
10. A power plant flue gas treatment system according to any of claims 1 to 5, characterized in that: the smoke air heater (4) adopts a three-dimensional tubular air heater.
CN201910369371.XA 2019-05-06 2019-05-06 Flue gas treatment system of power plant Pending CN111895442A (en)

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