CN110894954A - High-temperature tail gas purification and waste heat recovery system - Google Patents

High-temperature tail gas purification and waste heat recovery system Download PDF

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Publication number
CN110894954A
CN110894954A CN201911312361.9A CN201911312361A CN110894954A CN 110894954 A CN110894954 A CN 110894954A CN 201911312361 A CN201911312361 A CN 201911312361A CN 110894954 A CN110894954 A CN 110894954A
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CN
China
Prior art keywords
waste heat
tail gas
heat recovery
heat exchanger
purification
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Pending
Application number
CN201911312361.9A
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Chinese (zh)
Inventor
崔林军
金剑锋
王建华
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Taizhou Lingang Thermoelectric Co Ltd
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Taizhou Lingang Thermoelectric Co Ltd
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Priority to CN201911312361.9A priority Critical patent/CN110894954A/en
Publication of CN110894954A publication Critical patent/CN110894954A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/006—Layout of treatment plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
    • F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
    • F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B27/00—Machines, plants or systems, using particular sources of energy
    • F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/20—Sulfur; Compounds thereof
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/62—Absorption based systems
    • Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
    • 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
    • Y02E20/30—Technologies for a more efficient combustion or heat usage

Abstract

The invention relates to a high-temperature tail gas purification and waste heat recycling system, which comprises an air preheater, a dust remover, a desulfurizing tower, an induced draft fan and a chimney which are sequentially arranged on a smoke exhaust pipeline of a boiler, and further comprises a primary waste heat recycling subsystem and a purification system; the primary waste heat recovery and utilization subsystem comprises a waste heat recovery boiler, a turbonator and an absorption refrigerator, the waste heat recovery boiler is arranged between the air preheater and the dust remover, a steam outlet of the waste heat recovery boiler is connected with the turbonator, the turbonator is connected with the absorption refrigerator, and an outlet of the absorption refrigerator is connected with a water inlet of the waste heat recovery boiler; the purification system comprises a purification tower arranged between the desulfurization tower and the induced draft fan. The tail gas waste heat recovery device has the beneficial effects of purifying the tail gas, effectively recycling the waste heat of the tail gas and the like.

Description

High-temperature tail gas purification and waste heat recovery system
Technical Field
The invention relates to a tail gas purification and waste heat recovery system, in particular to a high-temperature tail gas purification and waste heat recovery system, and belongs to the technical field of boiler equipment.
Background
In all heat loss indexes of the boiler of the thermal power plant, the proportion of the heat loss of the exhaust smoke in the total heat loss of the boiler is the largest, the performance in the boiler of the high-parameter power plant is more obvious, the heat loss of the exhaust smoke accounts for 40% -50% of the total loss of the boiler, and is even higher, and the higher the temperature of the exhaust smoke is, the larger the heat loss of the exhaust smoke is. In the production process of a thermal power plant, the temperature of tail gas generated by boiler combustion can reach 130-200 ℃, the essence of the tail gas is as high as 250-300 ℃, and under the normal condition, the part of waste heat is directly discharged without being recycled, so that certain energy waste is caused, and the development of waste heat utilization equipment is not slow; and the tail gas that traditional boiler discharged usually needs cooling treatment, has wasted the energy that can be recycled, and tail gas purification efficiency is low, purifies incompletely.
Disclosure of Invention
The invention mainly aims at the problems of low utilization rate of the waste heat of the tail gas of the existing thermal power plant boiler and incomplete tail gas purification, and provides a high-temperature tail gas purification and waste heat recycling system which can effectively purify the tail gas and effectively recycle the waste heat of the tail gas.
The purpose of the invention is mainly realized by the following scheme:
a high-temperature tail gas purification and waste heat recovery system comprises an air preheater, a dust remover, a desulfurizing tower, an induced draft fan and a chimney which are sequentially arranged on a smoke exhaust pipeline of a boiler, and further comprises a primary waste heat recovery subsystem and a purification system; the primary waste heat recovery and utilization subsystem comprises a waste heat recovery boiler, a turbo generator and an absorption refrigerator, the waste heat recovery boiler is arranged between the air preheater and the dust remover, a steam outlet of the waste heat recovery boiler is connected with the turbo generator, the turbo generator is connected with the absorption refrigerator, and an outlet of the absorption refrigerator is connected with a water inlet of the waste heat recovery boiler; the purification system comprises a purification tower arranged between the desulfurization tower and the induced draft fan.
By adopting the technical scheme, the tail gas is firstly subjected to heat exchange through the waste heat recovery boiler before being dedusted, so that not only is waste heat recovery realized, but also the temperature of the tail gas entering the deduster is ensured to be reduced, thereby protecting the deduster, avoiding the deduster from being damaged due to high temperature of the tail gas, and effectively prolonging the service life of the deduster; the steam turbine generator and the absorption refrigerator form a combined device, the absorption refrigerator uses the exhaust steam of the steam turbine generator as heating steam, and the steam flowing through the absorption refrigerator is liquefied into water and then returns to the waste heat recovery boiler to realize water circulation; set up the purge column between desulfurizing tower and draught fan, can further purify the tail gas after the desulfurization, can effectively purify tail gas and discharge to reach standard.
Preferably, the high-temperature tail gas purification and waste heat recovery system further comprises a secondary waste heat recovery subsystem, the secondary waste heat recovery subsystem comprises a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a condenser and a gas-liquid separator, and cold water flows through the condenser through the second heat exchanger and the third heat exchanger and then is connected with a hot user through a conveying pipe; circulating water at the bottom of the purification tower sequentially passes through the fourth heat exchanger and the first heat exchanger and flows through the vapor-liquid separator, steam in the vapor-liquid separator forms condensed water after flowing through the condenser, and water in the vapor-liquid separator passes through the fourth heat exchanger and the third heat exchanger and then is conveyed to the spray pipe at the upper end of the purification tower to form a circulating loop of the secondary waste heat recycling subsystem.
By adopting the technical scheme, cold water firstly flows through the second heat exchanger and the third heat exchanger, and exchanges heat with tail gas in the purification tower and hot water flowing through the third heat exchanger respectively, and the obtained hot water further exchanges heat through high-temperature steam in the condenser to obtain final hot water and provides the final hot water for a heat user; the water at the bottom of the purification tower flows through the fourth heat exchanger, the first heat exchanger and the gas-liquid separator under the action of the circulating pump, then the water is divided into two paths, high-temperature steam discharged from the gas-liquid separator enters the condenser to be condensed, obtained condensed water is supplied to the outside, high-temperature water discharged from the gas-liquid separator enters the fourth heat exchanger and the third heat exchanger to be subjected to heat exchange, then the high-temperature steam is conveyed to the spray pipe at the upper end of the purification tower and is used for purifying tail gas, water circulation in the secondary waste heat recycling subsystem is realized, and water resources are saved while the waste heat.
Preferably, the first heat exchanger is arranged between the dust remover and the desulfurizing tower.
Through adopting above-mentioned technical scheme, carry out the secondary heat transfer before the desulfurizing tower, the waste heat of can make full use of tail gas avoids tail gas to get into the desulfurizing tower after the temperature reduces, leads to tail gas waste heat utilization to descend.
Preferably, the tail gas in the purification tower exchanges heat with cold water flowing through the second heat exchanger.
Through adopting above-mentioned technical scheme, come with cold water heat transfer through the tail gas waste heat that flows through the purifying column, make full use of resource.
Preferably, the desulfurizing tower adopts a spray desulfurizing tower, the inside interval of desulfurizing tower is provided with sprays layer and floater layer, the desulfurizing tower bottom is connected with the regeneration pond that is used for handling the waste liquid, regeneration liquid in the regeneration pond passes through the conveyer pipe and carries the layer that sprays, the layer that sprays includes annular shower, annular shower and the outer duct connections of desulfurizing tower, it all is provided with 3-5 layers with the floater layer to spray the layer.
By adopting the technical scheme, the spraying layer and the floating ball layer are arranged at intervals, so that the spraying layer can be contacted with the tail gas to the maximum extent, the substances such as dust, sulfur dioxide and the like in the tail gas can be fully adsorbed, and the tail gas purification and desulfurization effects are improved; and the bottom of the desulfurizing tower is connected with a regeneration tank for treating the waste liquid, and the generated waste liquid is subjected to regeneration treatment, so that the water in the desulfurizing tower is recycled, the desulfurizing cost is effectively reduced, and the resources are saved.
Preferably, the steam turbine generator is a backpressure steam turbine generator, the absorption refrigerator is a lithium bromide absorption refrigerator, the lithium bromide absorption refrigerator and the backpressure steam turbine generator form a combined device, exhaust steam of the backpressure steam turbine generator is used as heating steam of the lithium bromide absorption refrigerator, and the absorption refrigerator is connected with a cold user through a conveying pipe.
By adopting the technical scheme, the steam generated by the waste heat recovery boiler drives the steam turbine generator to do work to generate power, the steam exhausted by the steam turbine generator is used as heating steam of the absorption refrigerator, the absorption refrigerator is connected with a cold user through the conveying pipe to provide cold air or cold water for the cold user, and the steam flowing through the absorption refrigerator is liquefied into water and then returns to the water inlet of the waste heat recovery boiler, so that water circulation is realized, and resources are saved.
Preferably, the dust remover is a bag type dust remover.
By adopting the technical scheme, the bag type dust collector is a dry dust filtering device, the dust collection efficiency is high, generally more than 99%, the fine dust with submicron particle size has higher classification efficiency, the air volume treatment range is wide, and the emission of pollutants in tail gas can be reduced; compared with an electric dust collector, the bag type dust collector has the advantages of simple structure, convenient maintenance and operation, and lower manufacturing cost on the premise of ensuring the same high dust removal efficiency.
Preferably, the induced draft fan is an axial flow induced draft fan.
By adopting the technical scheme, the axial flow draught fan can discharge tail gas in the exhaust pipe at a low speed, and the influence on the waste heat recovery and purification of the tail gas caused by the overhigh exhaust speed of the tail gas in the exhaust pipe can be avoided.
Preferably, the first heat exchanger, the second heat exchanger, the third heat exchanger and the fourth heat exchanger all adopt heat pipe type heat exchangers.
By adopting the technical scheme, the first heat exchange tube and the second heat exchanger adopt gas-liquid type heat pipe heat exchangers, the third heat exchanger and the fourth heat exchanger adopt liquid-liquid type heat pipe heat exchangers, the heat pipe is a heat transfer component with high heat conductivity and high temperature property, the heat exchanger taking the heat pipe as a heat transfer element has the advantages of high heat transfer efficiency, compact structure and small fluid resistance loss, the heat loss in the heat exchange process can be avoided, and the utilization rate of the waste heat of the tail gas is improved.
Therefore, the invention has the following advantages:
(1) the invention can carry out multi-stage waste heat recovery and utilization and reasonable waste heat shunt on the boiler tail gas, fully utilizes the waste heat of the boiler tail gas, reduces the heat loss of exhaust smoke, improves the thermal efficiency of the boiler, and achieves the aims of saving energy and reducing cost;
(2) the multi-stage purification device can be used for effectively purifying the boiler tail gas in multiple stages, the desulfurization tower fully adsorbs substances such as dust, sulfur dioxide and the like in the tail gas, the effects of purifying the tail gas and desulfurizing are improved, the purification tower further deeply purifies the tail gas, the purification efficiency is high, the purification is thorough, and the atmospheric pollution is reduced;
(3) the invention has scientific and reasonable structure, safe and convenient use, reduces the operation cost and increases the economic benefit.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a secondary waste heat recovery subsystem of the present invention;
FIG. 3 is a schematic structural diagram of a primary waste heat recovery subsystem of the present invention;
FIG. 4 is a schematic view of the desulfurization tower of the present invention.
Illustration of the drawings: the system comprises a boiler 1, an air preheater 2, a dust remover 3, a desulfurizing tower 4, an induced draft fan 5, a chimney 6, a waste heat recovery boiler 7, a turbogenerator 8, an absorption refrigerator 9, a steam outlet 10, a water inlet 11, a purifying tower 12, a first heat exchanger 13, a second heat exchanger 14, a third heat exchanger 15, a fourth heat exchanger 16, a condenser 17, a gas-liquid separator 18, cold water 19, a hot user 20, a spray pipe 21, a spray layer 22, a floating ball layer 23, a regeneration tank 24 and a cold user 25.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
As shown in fig. 1, the invention provides a technical scheme, and a high-temperature tail gas purification and waste heat recovery system comprises an air preheater 2, a waste heat recovery boiler 7, a dust remover 3, a first heat exchanger 13, a desulfurizing tower 4, a purifying tower 12, an induced draft fan 5 and a chimney 6 which are sequentially arranged on a smoke exhaust pipeline of a boiler 1.
As shown in fig. 3, the high-temperature tail gas purification and waste heat recovery system further includes a primary waste heat recovery subsystem; the primary waste heat recovery and utilization subsystem comprises a waste heat recovery boiler 7, a turbonator 8 and an absorption refrigerator 9, the waste heat recovery boiler 7 is arranged between the air preheater 2 and the dust remover 3, a steam outlet 10 of the waste heat recovery boiler 7 is connected with the turbonator 8, the turbonator 8 is connected with the absorption refrigerator 9, an outlet of the absorption refrigerator 9 is connected with a water inlet 11 of the waste heat recovery boiler 7, and steam flowing through the absorption refrigerator 9 is liquefied into water and then returns to the waste heat recovery boiler 7, so that water circulation is realized; the turbonator 8 adopts a back pressure type turbonator, the absorption refrigerator 9 adopts a lithium bromide absorption refrigerator, the lithium bromide absorption refrigerator and the back pressure type turbonator form a combined device, exhaust steam of the back pressure type turbonator is used as heating steam of the lithium bromide absorption refrigerator, and the absorption refrigerator 9 is connected with a cold user 25 through a conveying pipe.
As shown in fig. 2, the high-temperature tail gas purification and waste heat recovery system further comprises a secondary waste heat recovery subsystem, the secondary waste heat recovery subsystem comprises a first heat exchanger 13, a second heat exchanger 14, a third heat exchanger 15, a fourth heat exchanger 16, a condenser 17 and a gas-liquid separator 18, cold water 19 flows through the condenser 17 through the second heat exchanger 14 and the third heat exchanger 15 and then is connected with a hot user 20 through a delivery pipe, and tail gas in the purification tower 12 exchanges heat with the cold water 19 flowing through the second heat exchanger 14; circulating water at the bottom of the purification tower 12 sequentially passes through the fourth heat exchanger 16 and the first heat exchanger 13 and flows through the vapor-liquid separator 18, steam in the vapor-liquid separator 18 flows through the condenser 17 to form condensed water, and water in the vapor-liquid separator 18 passes through the fourth heat exchanger 16 and the third heat exchanger 15 and is then conveyed to the spray pipe 21 at the upper end of the purification tower 12 to form a circulating loop of the secondary waste heat recycling subsystem.
As shown in fig. 4, a spray desulfurization tower is adopted as the desulfurization tower 4, a spray layer 22 and a floating ball layer 23 are arranged at intervals inside the desulfurization tower 4, a regeneration tank 24 for treating waste liquid is connected to the bottom of the desulfurization tower 4, regeneration liquid in the regeneration tank 24 is conveyed to the spray layer 22 through a conveying pipe, the spray layer 22 comprises an annular spray pipe, the annular spray pipe is connected with the conveying pipe outside the desulfurization tower 4, 3 layers are arranged on the spray layer 22 and the floating ball layer 23, water mist sprayed by the annular spray pipe is combined with dust, sulfur dioxide and other substances in tail gas and falls to the bottom of the desulfurization tower 4 after being combined, a floating ball in the floating ball layer 23 can be in contact with the tail gas to the maximum extent, the dust, sulfur dioxide and other substances in the tail gas are fully adsorbed, and the effects of; and the bottom of the desulfurizing tower 4 is connected with a regeneration tank 24 for treating the waste liquid, and the generated waste liquid is regenerated, so that the water in the desulfurizing tower 4 is recycled, the desulfurizing cost is effectively reduced, and the resources are saved.
In this embodiment, the dust collector 3 is a bag type dust collector, the induced draft fan 5 is an axial flow induced draft fan, the first heat exchanger 13 and the second heat exchanger 14 are gas-liquid type heat pipe exchangers, and the third heat exchanger and the fourth heat exchanger are liquid-liquid type heat pipe exchangers.
The specific working process of the invention is as follows: firstly, leading boiler tail gas with the temperature of 200 ℃ to a smoke exhaust pipeline by an induced draft fan 5, preheating air entering a boiler 1 by the tail gas through an air preheater 2, then entering a waste heat recovery boiler 7, leading the tail gas discharged from the waste heat recovery boiler 7 to a dust remover 3 for primary dust removal, leading the tail gas subjected to primary dust removal to enter a first heat exchanger 3 for heat exchange under the action of the induced draft fan 5, leading the tail gas discharged from a first heat exchanger 13 to enter a desulfurizing tower 4 for desulfurization, leading the desulfurized tail gas to enter a purifying tower 12 for deep purification, and then discharging the tail gas from a chimney 6 to the atmosphere under the action of the induced draft fan 5; the waste heat recovery boiler 7 generates high-temperature high-pressure steam by utilizing heat contained in the tail gas, the high-temperature high-pressure steam enters the steam turbine generator 8 through the steam outlet 10 to generate power and is refrigerated by the absorption refrigerator 9, and the steam flowing through the absorption refrigerator 9 is liquefied into water and then returns to the waste heat recovery boiler 7; cold water 19 flows through the second heat exchanger 14 and the third heat exchanger 15 and exchanges heat with tail gas in the purifying tower 12 and hot water in the third heat exchanger 15 respectively, the obtained hot water further exchanges heat with high-temperature steam in the condenser 17, the finally obtained hot water is provided for a hot user 20 through a conveying pipe, water at the bottom of the purifying tower 12 flows through the fourth heat exchanger 16, the first heat exchanger 13 and the gas-liquid separator 18 under the action of a circulating pump and then is divided into two paths, the high-temperature steam discharged from the gas-liquid separator 18 enters the condenser 17 to be condensed, the obtained condensed water is used by the outside, the high-temperature water discharged from the gas-liquid separator 18 enters the fourth heat exchanger 16 and the third heat exchanger 15 to exchange heat, and then the high-temperature water is conveyed to the spray pipe 21 at the upper end of the purifying tower.
The invention has scientific and reasonable structure and safe and convenient use. The boiler tail gas is subjected to multi-stage waste heat recycling and reasonable waste heat shunting, so that the waste heat of the boiler tail gas can be fully utilized, the heat loss of exhaust smoke is reduced, the heat efficiency of the boiler is improved, and the aims of saving energy and reducing cost are fulfilled; carry out multistage effective purification to boiler tail gas, the desulfurizing tower fully adsorbs matters such as dust and sulfur dioxide in the tail gas, improves the effect of purifying tail gas and desulfurization, and the purifying column further carries out deep purification to tail gas, and purification efficiency is high, purifies thoroughly, has reduced atmospheric pollution, has reduced running cost, has increased economic benefits.
It should be understood that this example is only for illustrating the present invention and is not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

Claims (10)

1. The utility model provides a high temperature tail gas purification and waste heat recovery utilize system, is including setting gradually air heater (2), dust remover (3), desulfurizing tower (4), draught fan (5) and chimney (6) on boiler (1) exhaust pipe, its characterized in that: the system also comprises a primary waste heat recycling subsystem and a purification system; the primary waste heat recovery and utilization subsystem comprises a waste heat recovery boiler (7), a steam turbine generator (8) and an absorption refrigerator (9), the waste heat recovery boiler (7) is arranged between the air preheater (2) and the dust remover (3), a steam outlet (10) of the waste heat recovery boiler (7) is connected with the steam turbine generator (8), the steam turbine generator (8) is connected with the absorption refrigerator (9), and an outlet of the absorption refrigerator (9) is connected with a water inlet (11) of the waste heat recovery boiler (7); the purification system comprises a purification tower (12) arranged between the desulfurization tower (4) and the induced draft fan (5).
2. The high-temperature tail gas purification and waste heat recovery system according to claim 1, characterized in that: the high-temperature tail gas purification and waste heat recovery system also comprises a secondary waste heat recovery subsystem, wherein the secondary waste heat recovery subsystem comprises a first heat exchanger (13), a second heat exchanger (14), a third heat exchanger (15), a fourth heat exchanger (16), a condenser (17) and a gas-liquid separator (18), and cold water (19) flows through the condenser (17) through the second heat exchanger (14) and the third heat exchanger (15) and then is connected with a hot user (20) through a conveying pipe; circulating water at the bottom of the purification tower (12) sequentially passes through the fourth heat exchanger (16) and the first heat exchanger (13) and flows through the vapor-liquid separator (18), steam in the vapor-liquid separator (18) flows through the condenser (17) to form condensed water, and water in the vapor-liquid separator (18) passes through the fourth heat exchanger (16) and the third heat exchanger (15) and is conveyed to the spray pipe (21) at the upper end of the purification tower (12) to form a circulating loop of the secondary waste heat recycling subsystem.
3. The high-temperature tail gas purification and waste heat recovery system according to claim 2, characterized in that: the first heat exchanger (13) is arranged between the dust remover (3) and the desulfurizing tower (4).
4. The high-temperature tail gas purification and waste heat recovery system according to claim 3, characterized in that: and tail gas in the purification tower (12) exchanges heat with cold water flowing through the second heat exchanger (14).
5. The high-temperature tail gas purification and waste heat recovery system according to claim 1, characterized in that: desulfurizing tower (4) adopt and spray the desulfurizing tower, desulfurizing tower (4) inside interval is provided with sprays layer (22) and floater layer (23), desulfurizing tower (4) bottom is connected with regeneration pond (24) that are used for handling the waste liquid, regeneration liquid in regeneration pond (24) is carried through the conveyer pipe and is sprayed layer (22).
6. The high-temperature tail gas purification and waste heat recovery system according to claim 1, characterized in that: the spraying layer (22) comprises an annular spraying pipe, the annular spraying pipe is connected with a conveying pipe outside the desulfurizing tower (4), and the spraying layer (22) and the floating ball layer (23) are provided with 3-5 layers.
7. The high-temperature tail gas purification and waste heat recovery system according to claim 1, characterized in that: the steam turbine generator (8) adopts a backpressure steam turbine generator, the absorption refrigerator (9) adopts a lithium bromide absorption refrigerator, the lithium bromide absorption refrigerator and the backpressure steam turbine generator form a combined device, exhaust steam of the backpressure steam turbine generator is used as heating steam of the lithium bromide absorption refrigerator, and the absorption refrigerator (9) is connected with a cold user (25) through a conveying pipe.
8. The high-temperature tail gas purification and waste heat recovery system according to claim 1, characterized in that: the dust remover (3) adopts a bag type dust remover.
9. The high-temperature tail gas purification and waste heat recovery system according to claim 1, characterized in that: and the draught fan (5) adopts an axial flow draught fan.
10. The high-temperature tail gas purification and waste heat recovery system according to claim 2, characterized in that: the first heat exchanger (13), the second heat exchanger (14), the third heat exchanger (15) and the fourth heat exchanger (16) are all heat pipe type heat exchangers.
CN201911312361.9A 2019-12-18 2019-12-18 High-temperature tail gas purification and waste heat recovery system Pending CN110894954A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911312361.9A CN110894954A (en) 2019-12-18 2019-12-18 High-temperature tail gas purification and waste heat recovery system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911312361.9A CN110894954A (en) 2019-12-18 2019-12-18 High-temperature tail gas purification and waste heat recovery system

Publications (1)

Publication Number Publication Date
CN110894954A true CN110894954A (en) 2020-03-20

Family

ID=69789055

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Application Number Title Priority Date Filing Date
CN201911312361.9A Pending CN110894954A (en) 2019-12-18 2019-12-18 High-temperature tail gas purification and waste heat recovery system

Country Status (1)

Country Link
CN (1) CN110894954A (en)

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