CN111457410A - System for eliminating smoke plume and flue gas waste heat utilization - Google Patents
System for eliminating smoke plume and flue gas waste heat utilization Download PDFInfo
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- CN111457410A CN111457410A CN202010239606.6A CN202010239606A CN111457410A CN 111457410 A CN111457410 A CN 111457410A CN 202010239606 A CN202010239606 A CN 202010239606A CN 111457410 A CN111457410 A CN 111457410A
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- 239000003546 flue gas Substances 0.000 title claims abstract description 210
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 209
- 239000000779 smoke Substances 0.000 title claims abstract description 122
- 239000002918 waste heat Substances 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 120
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 53
- 239000000428 dust Substances 0.000 claims abstract description 39
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 103
- 239000007921 spray Substances 0.000 claims description 35
- 238000002156 mixing Methods 0.000 claims description 31
- 239000000498 cooling water Substances 0.000 claims description 26
- 238000004891 communication Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 17
- 238000005057 refrigeration Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 13
- 238000003379 elimination reaction Methods 0.000 claims description 9
- 230000008030 elimination Effects 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 230000000007 visual effect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 description 19
- 238000005516 engineering process Methods 0.000 description 14
- 238000009833 condensation Methods 0.000 description 11
- 230000005494 condensation Effects 0.000 description 11
- 229920006395 saturated elastomer Polymers 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000001172 regenerating effect Effects 0.000 description 7
- 238000007599 discharging Methods 0.000 description 5
- 238000003303 reheating Methods 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 230000002087 whitening effect Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Images
Classifications
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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
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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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
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
-
- 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
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING 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
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
-
- 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
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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
- 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
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a utilization system for eliminating smoke plume and flue gas waste heat, which comprises an air preheater, a first heat exchanger, a dust remover, a desulfurizing tower and a chimney, wherein flue gas from a boiler enters the air preheater, the air preheater is communicated with the atmosphere, the flue gas enters the air preheater and is used for preheating the air, a flue gas outlet of the air preheater is communicated with a flue gas inlet of the first heat exchanger, the flue gas entering the first heat exchanger is subjected to heat exchange with water entering the first heat exchanger, a flue gas outlet of the first heat exchanger is communicated with a flue gas inlet of the dust remover, a flue gas outlet of the dust remover is communicated with a flue gas inlet of the desulfurizing tower, a flue gas outlet of the desulfurizing tower is communicated with a flue gas inlet of the chimney through a first pipeline, and the first pipeline is provided with an 8 th valve. The invention has the beneficial effects that: the waste heat energy of the flue gas is saved to the maximum extent, and the effects of saving energy, reducing emission and eliminating visual pollution are really realized.
Description
Technical Field
The invention belongs to the technical field of desulfurization environmental protection and energy comprehensive utilization, and particularly relates to a utilization system for eliminating smoke plume and flue gas waste heat.
Background
At present, in order to meet the requirement of ultralow emission in domestic thermal power plants, most of the domestic thermal power plants adopt a wet desulphurization device to treat flue gas, and the wet desulphurization device is used for greatly removing SO in the flue gas2Meanwhile, the particle collector has a certain trapping effect on particles with the particle size of more than 1-2.5um in the smoke. The flue gas at the outlet of the wet desulphurization device is generally saturated wet flue gas at 45-55 ℃, is discharged from a chimney and then is mixed with low-temperature air in the environment, and during the mixing process or water vapor is condensed and separated out, so that white and gray wet smoke plume, commonly called white smoke, can be seen. The appearance of the wet smoke plume causes visual pollution, and meanwhile, the rising of the high-humidity smoke forms water drops to fall when the high-humidity smoke rises and is cooled, so that the life of residents around a power plant is influenced.
The source of the white smoke plume is moisture, and saturated vapor in the smoke is generated by heat absorption and contains a large amount of latent heat, so that the key of the white smoke elimination is the temperature and humidity control of the discharged smoke. When the water absorbs heat and is heated to a certain temperature, the water is changed into steam, the heat in the steam is removed, the temperature of the steam is reduced to the dewing temperature, and the steam is condensed into water, which is a reversible process commonly existing in the nature.
Part of the water vapor in the wet flue gas comes from the combustion and the process, and part of the water vapor comes from the wet desulphurization and dust removal and the evaporation of water, and the key of the wet flue gas whitening is to control the absolute humidity and the relative humidity of the flue gas to be as low as possible or change the state of the water vapor. At present, flue gas whitening technology for a coal-fired power plant mainly comprises flue gas heating, flue gas condensation and flue gas condensation reheating, the flue gas heating technology is used for heating saturated wet flue gas, a flue gas state is far away from a saturated humidity curve, wet smoke plume elimination is realized, a flue gas diffusion effect is improved, the flue gas condensation technology is used for reducing the temperature of the flue gas through reducing the flue gas temperature, cooling and condensing water are carried out on the flue gas along the saturated humidity curve, and supersaturated water vapor in the flue gas is recovered to reduce the absolute humidity of the flue gas. And a flue gas condensation cooling mode is adopted, so that the critical cooling amplitude is linearly reduced along with the rise of the environmental temperature and is increased along with the increase of the environmental humidity.
Study on smoke whitening technology route under ultralow emission background [ J ] clean coal technology, 2019, 25 (2): 38-44 illustrate that: the outlet of the wet desulphurization device is generally saturated wet flue gas at 45-55 ℃. When the temperature of the smoke at the outlet of the device is 50 ℃, the smoke can be directly discharged without visible wet smoke plume when the environmental temperature is above 34.4-40.4 ℃, and for high-temperature dry areas, the operation without wet smoke plume can be realized by directly discharging saturated wet smoke in summer.
The smoke heating technology eliminates the moisture smoke plume, and the temperature rise amplitude of the smoke is reduced along with the rise of the environmental temperature. When the environmental temperature is lower than 11 ℃, the temperature rise amplitude of the smoke can reach more than 30 ℃ to eliminate the wet smoke plume; the environmental temperature is higher than 16 ℃, and the temperature rise amplitude of the smoke is below 30 ℃, so that the wet smoke plume can be eliminated. The cooling amplitude is linearly reduced along with the rise of the environmental temperature by adopting a flue gas condensation cooling mode, and the cooling amplitude is larger at a low temperature (5 ℃) and reaches 32.0-36.8 ℃; the temperature reduction amplitude is small at high temperature (25 ℃), and reaches 10.52-15.73 ℃. The smoke condensing and reheating mode is adopted, the temperature reduction amplitude and the temperature rise amplitude required by eliminating the wet smoke plume are lower than those of the single heating or condensing technology; the adoption of the condensation reheating mode can widen the application range of wet smoke plume elimination, and is suitable for the environment temperature below zero.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a system for utilizing the residual heat of smoke plume and smoke.
In order to achieve the purpose, the invention adopts the following technical scheme:
a system for utilizing the residual heat of smoke plume and flue gas is characterized by comprising an air preheater, a first heat exchanger, a dust remover, a desulfurizing tower and a chimney;
flue gas from the boiler enters the air preheater,
the air preheater is communicated with the atmosphere, the flue gas is used for preheating the air entering the air preheater,
the smoke outlet of the air preheater is communicated with the smoke inlet of the first heat exchanger, the smoke entering the first heat exchanger exchanges heat with the water entering the first heat exchanger,
the flue gas outlet of the first heat exchanger is communicated with the flue gas inlet of the dust remover,
the flue gas outlet of the dust remover is communicated with the flue gas inlet of the desulfurizing tower,
the flue gas outlet of desulfurizing tower with the flue gas entry of chimney passes through first pipeline intercommunication, just be provided with 8 valve 1.8 on the first pipeline.
Further, the system for utilizing the residual heat of the smoke plume and the flue gas, which is used for eliminating the smoke plume, further comprises a spray type direct contact heat exchanger and a lithium bromide refrigerator;
the flue gas inlet of the spray type direct contact heat exchanger is communicated with the flue gas outlet of the desulfurizing tower, the flue gas outlet of the spray type direct contact heat exchanger is communicated with a first pipeline through a second pipeline to form a first communicating point, a 9 th valve 1.9 is arranged on the second pipeline, and the first communicating point is positioned on a pipeline communicated between an 8 th valve 1.8 and the chimney;
a 6 th valve 1.6 is arranged on a pipeline which communicates the flue gas inlet of the spray type direct contact heat exchanger with the flue gas outlet of the desulfurizing tower;
a cooling water inlet of the lithium bromide refrigerator is communicated with a water outlet of the spray-type direct contact heat exchanger, a cooling water outlet of the lithium bromide refrigerator is communicated with a water inlet of the spray-type direct contact heat exchanger, and a 10 th valve 1.10 is arranged on a pipeline which communicates the water inlet of the spray-type direct contact heat exchanger with the cooling water outlet of the lithium bromide refrigerator;
the regenerative heating of the water supply is a process of extracting partial steam which does work from some intermediate stages of the steam turbine and sending the steam into a regenerative heater to heat the boiler water supply, and a thermodynamic cycle corresponding to the regenerative heating is called as a regenerative cycle.
The effect of regenerative heating is as follows: the feed water temperature of the boiler is improved, the average heat absorption temperature of the working medium in the boiler is improved, the heat economy is improved, the heat is not released by a condenser in the process of regenerative air extraction, the flow of the condensed gas of the steam turbine is reduced, the loss of a cold source is reduced, and the absolute internal efficiency of the steam turbine is improved.
A circulating water inlet of the first heat exchanger is communicated with an evaporator outlet of the lithium bromide refrigerator, and a circulating water outlet of the first heat exchanger is communicated with an evaporator inlet of the lithium bromide refrigerator; a 16 th valve 1.16 is arranged on a pipeline communicating a circulating water inlet of the first heat exchanger with an evaporator outlet of the lithium bromide refrigerator, and a 15 th valve 1.15 is arranged on a pipeline communicating a circulating water outlet of the first heat exchanger with an evaporator inlet of the lithium bromide refrigerator.
Further, the system for utilizing the residual heat of the smoke plume and the flue gas comprises a second heat exchanger and an air mixing heater;
a flue gas inlet of the second heat exchanger is communicated to a second pipeline through a third pipeline to form a second communication point, the second communication point is positioned on the pipeline between the 9 th valve 1.9 and the flue gas outlet of the spray-type direct contact heat exchanger, and the 7 th valve 1.7 is arranged on the third pipeline; any part of the flue gas inlet pipeline for communicating the 7 th valve 1.7 with the second heat exchanger extends out of a fourth pipeline to the first pipeline to form a third communication point, and a 17 th valve 1.17 is arranged on the fourth pipeline;
the smoke outlet of the second heat exchanger is communicated with the smoke inlet of the air mixing heater, and the smoke outlet of the air mixing heater is communicated with the smoke inlet of the chimney; a 14 th valve 1.14 is arranged on a pipeline for communicating the flue gas outlet of the air mixing heater with the flue gas inlet of the chimney;
an air inlet of the air preheater is communicated with the atmosphere, an air outlet of the air preheater is communicated with an air inlet of the air mixing heater, and a pipeline for communicating the air inlet of the air preheater with the atmosphere is provided with a 1 st valve 1.1;
the circulating water inlet of the first heat exchanger is communicated with the circulating water outlet of the second heat exchanger, the circulating water outlet of the first heat exchanger is communicated with the circulating water inlet of the second heat exchanger, a pipeline for communicating the circulating water inlet of the first heat exchanger with the circulating water outlet of the second heat exchanger is provided with a 4 th valve 1.4, and a pipeline for communicating the circulating water outlet of the first heat exchanger with the circulating water inlet of the second heat exchanger is provided with a 3 rd valve 1.3.
Further, any part of the pipeline for communicating the flue gas outlet of the second heat exchanger with the flue gas inlet of the air mixing heater extends out of a fifth pipeline to the first pipeline, and a fourth communication point is formed; the first communication point, the third communication point and the fourth communication point are positioned on a pipeline for communicating an 8 th valve 1.8 with the chimney, the first communication point, the third communication point and the fourth communication point are sequentially arranged away from the 8 th valve 1.8, and an 18 th valve 1.18 is arranged on the pipeline between the third communication point and the fourth communication point; and a 19 th valve 1.19 is arranged on the fifth pipeline.
Preferably, the system further comprises a heat recovery system for improving the efficiency of the steam turbine and the energy utilization rate, an opening is formed in a pipeline for communicating a water outlet of the spray type direct contact heat exchanger with a cooling water inlet of the lithium bromide refrigerator, the opening is communicated with the heat recovery system, and a 13 th valve 1.13 is arranged on the pipeline for communicating the opening with the heat recovery system.
Preferably, the heat supply system further comprises a 5 th valve 1.5 and a 2 nd valve 1.2 for controlling water supply and return of a heat supply network between the heat supply system and a heat user, wherein a circulating water inlet of the first heat exchanger is communicated with a water outlet of the heat user, a circulating water outlet of the first heat exchanger is communicated with a water inlet of the heat user for supplying hot water to the heat user, a 5 th valve 1.5 is arranged on a pipeline for communicating the circulating water inlet of the first heat exchanger with the water outlet of the heat user, and a 2 nd valve 1.2 is arranged on a pipeline for communicating the circulating water outlet of the first heat exchanger with the water inlet of the heat user.
Preferably, still include 11 th valve 1.11 and 12 th valve 1.12 that the refrigeration capacity between control and the cold user flows, the cooling water inlet of lithium bromide refrigerator with the water outlet intercommunication of cold user, the cooling water outlet of lithium bromide refrigerator with the water inlet intercommunication of cold user, the cooling water inlet of intercommunication lithium bromide refrigerator with be provided with 12 th valve 1.12 on the pipeline of the water outlet of cold user, communicate the cooling water outlet of lithium bromide refrigerator with be provided with 11 th valve 1.11 on the pipeline of the water inlet of cold user.
In the use method of the system for eliminating the smoke plume smoke waste heat, when the ambient temperature is above 34.4-40.4 ℃, the 8 th valve 1.8 and the 18 th valve 1.18 are opened, and the rest valves are closed; the smoke coming out of the boiler is treated by an air preheater, a first heat exchanger, a dust remover and a desulfurizing tower in sequence and then discharged into the atmosphere through a chimney, and after the treatment, no white smoke is generated at the outlet of the chimney.
When the flue gas temperature at the flue gas outlet of the desulfurizing tower is more than 45 ℃ and the environmental temperature is more than 34.4-40.4 ℃, the flue gas can be directly discharged without visible wet smoke plume, and the operation without the wet smoke plume can be realized by directly discharging saturated wet flue gas in summer in high-temperature dry areas. At the moment, the 8 th valves 1.8 and 1.18 are opened, the other valves are closed, the flue gas is discharged from the boiler, passes through the air preheater, the first heat exchanger, the dust remover and the desulfurizing tower, and is discharged from the desulfurizing tower to a chimney and is directly discharged to the atmosphere.
When the environmental temperature is 25-34.4 ℃, opening a 6 th valve 1.6, a 9 th valve 1.9, an 18 th valve 1.18, a 10 th valve 1.10, a 15 th valve 1.15 and a 16 th valve 1.16, and closing the rest valves; the flue gas from the boiler is sequentially treated by an air preheater, a first heat exchanger, a dust remover and a desulfurizing tower, then enters a spray type direct contact heat exchanger, is sprayed and cooled, the cooled flue gas enters a chimney and is directly discharged into the atmosphere, and after the treatment, no white smoke is generated at the outlet of the chimney.
Circulating water in the lithium bromide refrigerator exchanges heat with the flue gas of the first heat exchanger to reduce the temperature of the flue gas, the lithium bromide refrigerator performs refrigeration, cooling water enters the spray type direct contact heat exchanger to spray the flue gas, and the cooling water is treated and then returns to the lithium bromide refrigerator;
preferably, when refrigeration is needed, the 11 th valve 1.11 and the 12 th valve 1.12 are opened; the lithium bromide refrigerator supplies the heated water to the refrigerator for refrigeration, and supplies the refrigeration capacity to cold users.
The flue gas from the boiler passes through an air preheater, a first heat exchanger, a dust remover and a desulfurizing tower, enters a spray type direct contact heat exchanger, is sprayed for cooling, and the cooled flue gas enters a chimney and is directly discharged into the atmosphere; the flue gas passes through first heat exchanger, with the circulating water heating in the lithium bromide refrigerator, the temperature of flue gas reduces, and the lithium bromide refrigerator refrigeration, cooling water get into fountain direct contact heat exchanger, sprays the flue gas, with the vapor condensation in the flue gas, detach partly pollutant simultaneously, and the lithium bromide refrigerator is got back to the comdenstion water through handling again, and the other part is to the backheat system, improves steam turbine efficiency, improves energy utilization.
In the use method of the system for eliminating the smoke plume smoke waste heat, when the ambient temperature is 16-25 ℃, the 1 st valve 1.1, the 3 rd valve 1.3, the 4 th valve 1.4, the 8 th valve 1.8, the 17 th valve 1.17 and the 14 th valve 1.14 are opened, and the rest valves are closed;
the smoke coming out of the boiler is treated by an air preheater, a first heat exchanger, a dust remover, a desulfurizing tower, a second heat exchanger and an air mixing heater in sequence and enters a chimney to be discharged into the atmosphere, and after the treatment, no white smoke is generated at the outlet of the chimney.
Preferably, if the heating period is processed, the 2 nd valve 1.2 and the 5 th valve 1.5 are opened, and the first heat exchanger heats the circulating water of the heat supply network to supply to a heat user.
The flue gas comes out from the boiler, passes through an air preheater, a first heat exchanger, a dust remover, a desulfurizing tower, a second heat exchanger, an air mixing heater and enters a chimney to be discharged into the atmosphere. The flue gas heats the air in the air heater, and the flue gas is exothermic, and the temperature of flue gas reduces, and in first heat exchanger, the heating circulating water, the flue gas temperature further descends, and the flue gas flow volume diminishes, and fly ash specific resistance also corresponding reduction, and then makes dust remover working property obtain promoting by a wide margin. Under the same dust removal efficiency condition, the design of the dust remover can adopt smaller dust remover specification, less energy consumption and smaller occupied area. The hot circulating water heats the flue gas from the desulfurizing tower in the second heat exchanger, the heated flue gas is mixed with the hot air from the air preheater in the air mixing heater after coming out of the second heat exchanger, and then the heated flue gas is heated again and discharged to the atmosphere from a chimney. The flue gas is heated by hot water and hot air in stages, so that the heat transfer temperature difference is reduced, and the energy loss is reduced. If the flue gas is in the heating period, the No. 2 valve 1.2 and the No. 5 valve 1.5 are opened while the flue gas heating technology eliminates the wet flue gas plume, the first heat exchanger heats the heat supply network circulating water to supply heat users, and meanwhile, a part of the heat supply network circulating water is used for heating the flue gas coming out of the desulfurizing tower.
When the environmental temperature is not more than 16 ℃, opening the 1 st valve 1.1, the 6 th valve 1.6, the 9 th valve 1.9, the 10 th valve 1.10, the 13 th valve 1.13, the 15 th valve 1.15, the 16 th valve 1.16, the 14 th valve 1.14, the 18 th valve 1.18 and the 19 th valve 1.19, and closing the rest valves;
the flue gas from the boiler is treated by an air preheater, a first heat exchanger, a dust remover and a desulfurizing tower in sequence, then enters a spray type direct contact heat exchanger for spray cooling, then enters an air mixing heat exchanger and enters a chimney to be discharged into the atmosphere, and after the treatment, no white smoke is generated at the outlet of the chimney.
The flue gas comes out from the boiler, passes through an air preheater, a first heat exchanger, a dust remover and a desulfurizing tower, enters a spray type direct contact heat exchanger, is sprayed for cooling, then enters an air mixing heater, enters a chimney and is discharged into the atmosphere. The flue gas heats air in an air preheater, and circulating water is heated in a first heat exchanger; and condensing the flue gas from the desulfurizing tower in a spray type direct contact heat exchanger, mixing the condensed flue gas with hot air from an air preheater in an air mixing heater to be heated, and then discharging the heated flue gas to the atmosphere from a chimney. Circulating water heated in the first heat exchanger enters the lithium bromide refrigerator, prepared cooling water enters the spray-type direct contact heat exchanger to remove water vapor and pollutants in flue gas, the water vapor in the flue gas is condensed into water, the condensed water returns to the lithium bromide refrigerator after treatment, and the rest of the water returns to a heat regeneration system, so that the efficiency of a steam turbine is improved, and the energy utilization rate is improved. The flue gas comes out from the spray type direct contact heat exchanger, enters an air mixing heater, is mixed and heated with hot air, and then enters a chimney to be discharged into the atmosphere.
Preferably, the flue gas temperature at the flue gas outlet of the desulfurizing tower is more than 45 ℃, or more than 50 ℃ or more than 55 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the system can solve the smoke plume phenomenon in the smoke discharge process at different environmental temperatures; namely, the direct smoke emission mode can be adopted to treat the smoke emission of the desulfurizing tower with the smoke temperature of more than 45 ℃ and the environmental temperature of more than 34.4-40.4 ℃; the flue gas emission of the desulfurizing tower with the flue gas temperature of more than 45 ℃ and the environmental temperature of 25-34.4 ℃ is treated by adopting a flue gas condensation cooling mode; flue gas emission with the flue gas temperature of the desulfurizing tower of more than 45 ℃ and the environmental temperature of 16-25 ℃ is treated by adopting a flue gas heating technology; flue gas emission with the flue gas temperature of the desulfurizing tower being more than 45 ℃ and the environmental temperature being lower than 16 ℃ is treated by adopting a flue gas condensation reheating technology; different energy consumed for eliminating the wet smoke plume under different environmental temperatures is utilized, and different technical schemes are adopted: dehumidifying smoke plume by using a condensation technology, and driving a lithium bromide refrigerator by using waste heat of smoke to condense water vapor in the smoke; the flue gas heating technology is used for dehumidifying flue plumes, air and circulating water are respectively heated by utilizing flue gas waste heat, and flue gas is heated by utilizing hot water and hot air in a grading manner, so that the heat exchange temperature difference is reduced, and the energy loss is reduced; the smoke plume is dehumidified by the condensation and reheating smoke technology, the waste heat of the smoke is fully utilized, the energy required by the dehumidification smoke plume is reduced, the waste heat and the heat energy of the smoke are saved to the maximum extent, the effects of energy conservation, emission reduction and visual pollution elimination can be really realized, meanwhile, a heating and refrigerating system is introduced into a smoke waste heat utilization system, the waste heat of the smoke is fully utilized, the wet smoke plume is eliminated, and the environmental pollution is reduced.
In addition, the system for eliminating the smoke plume flue gas waste heat can also determine a method for eliminating wet smoke plume according to the actual requirements of heat supply and refrigeration; for example, in the heating period, if the residual heat is surplus, a heating smoke plume removal scheme can be selected, in the cooling period, if the cold quantity is surplus, a condensing smoke plume removal scheme can be selected, namely, the residual heat of the smoke is fully utilized, the wet smoke plume is eliminated, and the environmental pollution is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of a system for utilizing flue gas waste heat to eliminate smoke plume according to the present invention;
FIG. 2 is a schematic structural diagram of a second embodiment of a system for utilizing flue gas waste heat to eliminate smoke plume according to the present invention;
FIG. 3 is a schematic structural diagram of a third embodiment of a system for utilizing residual heat of flue gas to eliminate smoke plume according to the present invention;
FIG. 4 is a schematic structural diagram of a fourth embodiment of a system for utilizing flue gas waste heat to eliminate smoke plume according to the present invention;
FIG. 5 is a flow chart of the system for utilizing the residual heat of flue gas to eliminate smoke plume according to the present invention;
in the figure:
1-boiler, 2-air preheater, 3-first heat exchanger, 4-dust remover,
A 5-desulfurizing tower, a 6-spray type direct contact heat exchanger, a 7-lithium bromide refrigerator,
8-cold user, 9-second heat exchanger, 10, air mixing heater, 11, chimney,
1.1-1 st valve, 1.2-2 nd valve, 1.3-3 rd valve, 1.4-4 th valve,
1.5-5 th valve, 1.6-6 th valve, 1.7-7 th valve, 1.8-8 th valve,
1.9-9 th valve, 1.10-10 th valve, 1.11-11 th valve, 1.12-12 th valve,
1.13-13 th valve, 1.14-14 th valve, 1.15-15 th valve, 1.16-16 th valve,
1.17-17 th valve, 1.18-18 th valve, 1.19-19 th valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in detail and with reference to the accompanying drawings, wherein:
referring to fig. 1 and 5, fig. 1 is a schematic structural diagram of a first embodiment of a system for utilizing flue gas waste heat to eliminate smoke plume according to the present invention. As shown in fig. 1, when the flue gas temperature at the flue gas outlet of the desulfurizing tower 5 is above 45 ℃ and the ambient temperature is above 34.4-40.4 ℃, the 8 th valve 1.8 and the 18 th valve 1.18 (refer to fig. 5 specifically) are opened, and the rest valves are closed; the flue gas from the boiler 1 is treated by an air preheater 2, a first heat exchanger 3, a dust remover 4 and a desulfurizing tower 5 in sequence, and then is discharged into the atmosphere through a chimney 11; the flue gas temperature at the outlet of the desulfurizing tower is more than 45 ℃, the flue gas can be directly discharged without visible wet smoke plume when the environmental temperature is more than 34.4-40.4 ℃, and the operation without the wet smoke plume can be realized by directly discharging saturated wet flue gas in summer in high-temperature dry areas. At the moment, the 8 th valves 1.8 and 1.18 are opened, the rest valves are closed, the flue gas is discharged from the boiler 1, passes through the air preheater 2, the first heat exchanger 3, the dust remover 4 and the desulfurizing tower 5, and is discharged from the desulfurizing tower 5 to the chimney 11 to be directly discharged into the atmosphere, and after the treatment, no white smoke is discharged from the outlet of the chimney.
Referring to fig. 2 and 5, fig. 2 is a schematic structural diagram of a second embodiment of a system for utilizing flue gas waste heat to eliminate smoke plume according to the present invention. As shown in fig. 2: when the flue gas temperature of the flue gas outlet of the desulfurizing tower 5 is over 45 ℃ (for example, 50 ℃), and the ambient temperature is 25-34.4 ℃, opening a 6 th valve 1.6, a 9 th valve 1.9, an 18 th valve 1.18, a 10 th valve 1.10, a 15 th valve 1.15 and a 16 th valve 1.16, and closing the rest valves; the flue gas from the boiler 1 is sequentially treated by an air preheater 2, a first heat exchanger 3, a dust remover 4 and a desulfurizing tower 5, then enters a spray type direct contact heat exchanger 6, is sprayed and cooled, the cooled flue gas enters a chimney 11 and is directly discharged into the atmosphere, and after the treatment, no white smoke is generated at the outlet of the chimney; circulating water in the lithium bromide refrigerator 7 exchanges heat with the flue gas of the first heat exchanger 3 to reduce the temperature of the flue gas, the lithium bromide refrigerator 7 performs refrigeration, cooling water enters the spray type direct contact heat exchanger 6 and sprays the flue gas, and the cooling water is treated and then returns to the lithium bromide refrigerator 7; the flue gas from the boiler 1 passes through an air preheater 2, a first heat exchanger 3, a dust remover 4 and a desulfurizing tower 5, enters a spray type direct contact heat exchanger 6, is sprayed for cooling, and enters a chimney 11 for directly discharging into the atmosphere after cooling; the flue gas passes through the first heat exchanger 3, circulating water in the lithium bromide refrigerator 7 is heated, the temperature of the flue gas is reduced, the lithium bromide refrigerator 7 is used for refrigerating, cooling water enters the spray type direct contact heat exchanger 6, the flue gas is sprayed, water vapor in the flue gas is condensed, meanwhile, a part of pollutants are removed, condensed water is treated and then returns to the lithium bromide refrigerator 7, and the rest of the condensed water enters a regenerative system, so that the efficiency of a steam turbine is improved, and the energy utilization rate is improved; when refrigeration is needed, opening the 11 th valve 1.11 and the 12 th valve 1.12; the lithium bromide refrigerator 7 supplies the heated water to the refrigerator for refrigeration and supplies the refrigerating capacity to the cold user 8.
Referring to fig. 3 and 5, fig. 3 is a schematic structural diagram of a system for utilizing flue gas waste heat to eliminate smoke plume according to a third embodiment of the present invention. When the flue gas temperature of the flue gas outlet of the desulfurizing tower 5 is over 45 ℃ (for example, 50 ℃), and the ambient temperature is 16-25 ℃, opening the 1 st valve 1.1, the 3 rd valve 1.3, the 4 th valve 1.4, the 8 th valve 1.8, the 17 th valve 1.17 and the 14 th valve 1.14, and closing the rest valves;
flue gas from the boiler 1 sequentially passes through an air preheater 2, a first heat exchanger 3, a dust remover 4, a desulfurizing tower 5, a second heat exchanger 9 and an air mixing heater 10 for treatment, enters a chimney 11 and is discharged into the atmosphere;
the flue gas comes out from the boiler 1, passes through the air preheater 2, the first heat exchanger 3, the dust remover 4, the desulfurizing tower 5, the second heat exchanger 9, the air mixing heater 10, and enters the chimney 11 to be discharged into the atmosphere, and after the treatment, no white smoke is generated at the outlet of the chimney. The flue gas heats the air in air heater 2, and the flue gas is exothermic, and the temperature of flue gas reduces, and in first heat exchanger 3, the heating cycle water, the flue gas temperature further descends, and flue gas flow volume diminishes, and fly ash specific resistance also corresponding reduction, and then makes dust remover 4 working property obtain promoting by a wide margin. Under the same dust removal efficiency condition, the dust remover 4 can adopt a smaller dust remover 4 specification, less energy consumption and smaller occupied area in design. The hot circulating water heats the flue gas from the desulfurizing tower 5 in the second heat exchanger 9, the heated flue gas is mixed with the hot air from the air preheater 2 in the air mixing heater 10 after coming out of the second heat exchanger 9, and then is heated again, and then is discharged to the atmosphere from the chimney 11. The flue gas is heated by hot water and hot air in stages, so that the heat transfer temperature difference is reduced, and the energy loss is reduced. If the flue gas is in the heating period, the 2 nd valve 1.2 and the 5 th valve 1.5 are opened while the flue gas heating technology eliminates the wet flue gas plume, the first heat exchanger 3 heats the heat supply network circulating water to supply to a heat user, and meanwhile, a part of the heat supply network circulating water is used for heating the flue gas coming out of the desulfurizing tower 5.
Referring to fig. 4 and 5, fig. 4 is a schematic structural diagram of a system for utilizing flue gas waste heat to eliminate smoke plume according to a fourth embodiment of the present invention. When the flue gas temperature of the flue gas outlet of the desulfurizing tower 5 is over 45 ℃ (for example, 50 ℃), and the environmental temperature is not more than 16 ℃, opening the 1 st valve 1.1, the 6 th valve 1.6, the 9 th valve 1.9, the 10 th valve 1.10, the 13 th valve 1.13, the 15 th valve 1.15, the 16 th valve 1.16, the 14 th valve 1.14, the 18 th valve 1.18 and the 19 th valve 1.19, and closing the rest valves;
the flue gas from the boiler 1 is treated by an air preheater 2, a first heat exchanger 3, a dust remover 4 and a desulfurizing tower 5 in sequence, then enters a spray type direct contact heat exchanger 6, is sprayed for cooling, then enters an air mixing heat exchanger and enters a chimney 11 to be discharged into the atmosphere, and after the treatment, no white smoke is generated at the outlet of the chimney.
The flue gas comes out from the boiler 1, passes through the air preheater 2, the first heat exchanger 3, the dust remover 4 and the desulfurizing tower 5, enters the spray type direct contact heat exchanger 6, is sprayed for cooling, then enters the air mixing heater 10 and enters the chimney 11 to be discharged into the atmosphere. The flue gas heats air in the air preheater 2, and the circulating water is heated in the first heat exchanger 3; the flue gas from the desulfurizing tower 5 is condensed in the spray type direct contact heat exchanger 6, and the condensed flue gas enters the air mixing heater 10 to be mixed with the hot air from the air preheater 2 to be heated, and then is discharged to the atmosphere from the chimney 11. Circulating water heated in the first heat exchanger 3 enters the lithium bromide refrigerator 7, prepared cooling water enters the spray-type direct contact heat exchanger 6, water vapor and pollutants in smoke are removed, the water vapor in the smoke is condensed into water, the condensed water returns to the lithium bromide refrigerator 7 after being treated, and the rest of the water returns to a heat recovery system, so that the efficiency of a steam turbine is improved, and the energy utilization rate is improved. The flue gas comes out from the spray type direct contact heat exchanger 6, enters an air mixing heater 10, is mixed and heated with hot air, and then enters a chimney 11 to be discharged into the atmosphere.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (12)
1. A system for utilizing the residual heat of smoke plume and flue gas is characterized by comprising an air preheater, a first heat exchanger, a dust remover, a desulfurizing tower and a chimney;
flue gas from the boiler enters the air preheater,
the air preheater is communicated with the atmosphere, the flue gas is used for preheating the air entering the air preheater,
the smoke outlet of the air preheater is communicated with the smoke inlet of the first heat exchanger, the smoke entering the first heat exchanger exchanges heat with the water entering the first heat exchanger,
the flue gas outlet of the first heat exchanger is communicated with the flue gas inlet of the dust remover,
the flue gas outlet of the dust remover is communicated with the flue gas inlet of the desulfurizing tower,
and the flue gas outlet of the desulfurizing tower is communicated with the flue gas inlet of the chimney through a first pipeline, and the first pipeline is provided with an 8 th valve (1.8).
2. The system for utilizing the residual heat of the smoke plume and the flue gas, according to claim 1, is characterized by further comprising a spray type direct contact heat exchanger and a lithium bromide refrigerator;
the flue gas inlet of the spray type direct contact heat exchanger is communicated with the flue gas outlet of the desulfurizing tower, the flue gas outlet of the spray type direct contact heat exchanger is communicated with the first pipeline through a second pipeline to form a first communicating point, a 9 th valve (1.9) is arranged on the second pipeline, and the first communicating point is positioned on the pipeline communicated between the 8 th valve (1.8) and the chimney;
a 6 th valve (1.6) is arranged on a pipeline which communicates the flue gas inlet of the spray type direct contact heat exchanger with the flue gas outlet of the desulfurizing tower;
a cooling water inlet of the lithium bromide refrigerator is communicated with a water outlet of the spray-type direct contact heat exchanger, a cooling water outlet of the lithium bromide refrigerator is communicated with a water inlet of the spray-type direct contact heat exchanger, and a 10 th valve (1.10) is arranged on a pipeline which communicates the water inlet of the spray-type direct contact heat exchanger with the cooling water outlet of the lithium bromide refrigerator;
a circulating water inlet of the first heat exchanger is communicated with an evaporator outlet of the lithium bromide refrigerator, and a circulating water outlet of the first heat exchanger is communicated with an evaporator inlet of the lithium bromide refrigerator; a 16 th valve (1.16) is arranged on a pipeline communicating a circulating water inlet of the first heat exchanger with an evaporator outlet of the lithium bromide refrigerator, and a 15 th valve (1.15) is arranged on a pipeline communicating a circulating water outlet of the first heat exchanger with an evaporator inlet of the lithium bromide refrigerator.
3. The system for utilizing the waste heat of the flue gas for eliminating the smoke plume as claimed in claim 2, further comprising a second heat exchanger and an air mixing heater;
a flue gas inlet of the second heat exchanger is communicated to a second pipeline through a third pipeline to form a second communication point, the second communication point is positioned on the pipeline between a 9 th valve (1.9) and a flue gas outlet of the spray-type direct contact heat exchanger, and a 7 th valve (1.7) is arranged on the third pipeline; any part of the flue gas inlet pipeline for communicating the 7 th valve (1.7) with the second heat exchanger extends out of a fourth pipeline to the first pipeline to form a third communication point, and a 17 th valve (1.17) is arranged on the fourth pipeline;
the smoke outlet of the second heat exchanger is communicated with the smoke inlet of the air mixing heater, and the smoke outlet of the air mixing heater is communicated with the smoke inlet of the chimney; a 14 th valve (1.14) is arranged on a pipeline which communicates the flue gas outlet of the air mixing heater with the flue gas inlet of the chimney;
the air inlet of the air preheater is communicated with the atmosphere, the air outlet of the air preheater is communicated with the air inlet of the air mixing heater, and a pipeline for communicating the air inlet of the air preheater with the atmosphere is provided with a 1 st valve (1.1);
the circulating water inlet of the first heat exchanger is communicated with the circulating water outlet of the second heat exchanger, the circulating water outlet of the first heat exchanger is communicated with the circulating water inlet of the second heat exchanger, a pipeline for communicating the circulating water inlet of the first heat exchanger with the circulating water outlet of the second heat exchanger is provided with a 4 th valve (1.4), and a pipeline for communicating the circulating water outlet of the first heat exchanger with the circulating water inlet of the second heat exchanger is provided with a 3 rd valve (1.3).
4. The system for utilizing the residual heat of flue gas generated by eliminating the smoke plume as claimed in claim 3, wherein any part of the pipeline communicating the flue gas outlet of the second heat exchanger with the flue gas inlet of the air mixing heater extends out of a fifth pipeline to the first pipeline and forms a fourth communication point; the first communication point, the third communication point and the fourth communication point are positioned on a pipeline for communicating an 8 th valve (1.8) with the chimney, the first communication point, the third communication point and the fourth communication point are sequentially far away from the 8 th valve (1.8), and a 18 th valve (1.18) is arranged on the pipeline between the third communication point and the fourth communication point; and a 19 th valve (1.19) is arranged on the fifth pipeline.
5. The system for utilizing the residual heat of the smoke plume-eliminating flue gas as claimed in claim 2, further comprising a heat recovery system for improving the efficiency of the steam turbine and the energy utilization rate, wherein an opening is arranged on a pipeline for communicating the water outlet of the spray-type direct contact heat exchanger with the cooling water inlet of the lithium bromide refrigerator, the opening is communicated with the heat recovery system, and a 13 th valve (1.13) is arranged on a pipeline for communicating the opening with the heat recovery system.
6. The system for utilizing the residual heat of the flue gas generated by the smoke plume elimination process according to claim 1, further comprising a 5 th valve (1.5) and a 2 nd valve (1.2) for controlling the supply and return of water to the heat supply network between the heat supply users, wherein the circulating water inlet of the first heat exchanger is communicated with the water outlet of the heat supply users, the circulating water outlet of the first heat exchanger is communicated with the water inlet of the heat supply users for supplying hot water to the heat supply users, the 5 th valve (1.5) is arranged on a pipeline communicating the circulating water inlet of the first heat exchanger with the water outlet of the heat supply users, and the 2 nd valve (1.2) is arranged on a pipeline communicating the circulating water outlet of the first heat exchanger with the water inlet of the heat supply users.
7. The system for utilizing the residual heat of the smoke plume-eliminating smoke gas as claimed in claim 2, further comprising an 11 th valve (1.11) and a 12 th valve (1.12) for controlling the flow of the refrigerating capacity between the system and the cold user, wherein the cooling water inlet of the lithium bromide refrigerator is communicated with the water outlet of the cold user, the cooling water outlet of the lithium bromide refrigerator is communicated with the water inlet of the cold user, the 12 th valve (1.12) is arranged on a pipeline for communicating the cooling water inlet of the lithium bromide refrigerator with the water outlet of the cold user, and the 11 th valve (1.11) is arranged on a pipeline for communicating the cooling water outlet of the lithium bromide refrigerator with the water inlet of the cold user.
8. The use method of the system for utilizing the residual heat of the smoke plume elimination flue gas as claimed in claim 7, wherein when the ambient temperature is above 34.4-40.4 ℃, the 8 th valve (1.8) and the 18 th valve (1.18) are opened, and the rest valves are closed; the smoke coming out of the boiler is treated by an air preheater, a first heat exchanger, a dust remover and a desulfurizing tower in sequence, and then is discharged into the atmosphere through a chimney, and after the treatment, no white smoke appears at the outlet of the chimney;
preferably, when refrigeration is needed, opening a 11 th valve (1.11), a 12 th valve (1.12), a 15 th valve (1.15) and a 16 th valve (1.16);
circulating water in the lithium bromide refrigerator exchanges heat with flue gas of the first heat exchanger to reduce the temperature of the flue gas, and the lithium bromide refrigerator supplies the heated water to the refrigerator for refrigeration and supplies the refrigerating capacity to cold users.
9. The use method of the system for utilizing the residual heat of the smoke plume elimination flue gas as claimed in claim 7, wherein when the ambient temperature is 25-34.4 ℃, the 6 th valve (1.6), the 9 th valve (1.9), the 18 th valve (1.18), the 10 th valve (1.10), the 13 th valve (1.13), the 15 th valve (1.15) and the 16 th valve (1.16) are opened, and the rest valves are closed; the flue gas from the boiler is sequentially treated by an air preheater, a first heat exchanger, a dust remover and a desulfurizing tower, then enters a spray type direct contact heat exchanger for spray cooling, the cooled flue gas enters a chimney and is directly discharged into the atmosphere, and after the treatment, no white smoke is generated at the outlet of the chimney;
circulating water in the lithium bromide refrigerator exchanges heat with the flue gas of the first heat exchanger to reduce the temperature of the flue gas, the lithium bromide refrigerator performs refrigeration, cooling water enters the spray type direct contact heat exchanger to spray the flue gas, and the cooling water is treated and then returns to the lithium bromide refrigerator;
preferably, when refrigeration is needed, opening a 11 th valve (1.11) and a 12 th valve (1.12); the lithium bromide refrigerator supplies the heated water to the refrigerator for refrigeration, and supplies the refrigeration capacity to cold users.
10. The use method of the system for utilizing the residual heat of the smoke plume elimination flue gas as claimed in claim 6, wherein when the ambient temperature is 16-25 ℃, the 1 st valve (1.1), the 3 rd valve (1.3), the 4 th valve (1.4), the 8 th valve (1.8), the 17 th valve (1.17) and the 14 th valve (1.14) are opened, and the rest valves are closed;
the smoke coming out of the boiler is treated by an air preheater, a first heat exchanger, a dust remover, a desulfurizing tower, a second heat exchanger and an air mixing heater in sequence, enters a chimney and is discharged into the atmosphere, and after the treatment, no white smoke is generated at the outlet of the chimney;
preferably, if the heating period is processed, the 2 nd valve (1.2) and the 5 th valve (1.5) are opened, and the first heat exchanger heats the circulating water of the heat supply network to supply to a heat user.
11. The use method of the system for utilizing the residual heat of the smoke plume elimination flue gas as claimed in claim 6, wherein when the ambient temperature is not more than 16 ℃, the 1 st valve (1.1), the 6 th valve (1.6), the 9 th valve (1.9), the 10 th valve (1.10), the 13 th valve (1.13), the 15 th valve (1.15), the 16 th valve (1.16), the 14 th valve (1.14), the 18 th valve (1.18) and the 19 th valve (1.19) are opened, and the rest valves are closed;
the flue gas from the boiler is treated by an air preheater, a first heat exchanger, a dust remover and a desulfurizing tower in sequence, then enters a spray type direct contact heat exchanger for spray cooling, then enters an air mixing heat exchanger and enters a chimney to be discharged into the atmosphere, and after the treatment, no white smoke is generated at the outlet of the chimney.
12. The system for utilizing the residual heat of flue gas generated by eliminating the smoke plume as claimed in claims 8 to 11, wherein the temperature of the flue gas at the flue gas outlet of the desulfurizing tower is above 45 ℃.
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| CN202010239606.6A CN111457410A (en) | 2020-03-30 | 2020-03-30 | System for eliminating smoke plume and flue gas waste heat utilization |
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| CN202010239606.6A CN111457410A (en) | 2020-03-30 | 2020-03-30 | System for eliminating smoke plume and flue gas waste heat utilization |
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|---|---|---|---|---|
| CN113959241A (en) * | 2021-10-19 | 2022-01-21 | 广东环境保护工程职业学院 | Spray drying tower flue gas waste heat recovery and eliminate wet cigarette feather system |
| CN113959241B (en) * | 2021-10-19 | 2023-10-03 | 广东环境保护工程职业学院 | Flue gas waste heat recovery and wet smoke plume elimination system of spray drying tower |
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