CN113686190A - System and method for comprehensively recycling and utilizing low-temperature waste heat - Google Patents
System and method for comprehensively recycling and utilizing low-temperature waste heat Download PDFInfo
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- CN113686190A CN113686190A CN202111011483.1A CN202111011483A CN113686190A CN 113686190 A CN113686190 A CN 113686190A CN 202111011483 A CN202111011483 A CN 202111011483A CN 113686190 A CN113686190 A CN 113686190A
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- 239000002918 waste heat Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims description 8
- 238000004064 recycling Methods 0.000 title claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 233
- 238000010438 heat treatment Methods 0.000 claims abstract description 78
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000003546 flue gas Substances 0.000 claims abstract description 63
- 239000010865 sewage Substances 0.000 claims abstract description 33
- 239000000126 substance Substances 0.000 claims abstract description 12
- 239000000428 dust Substances 0.000 claims abstract description 8
- 230000003009 desulfurizing effect Effects 0.000 claims description 39
- 239000000498 cooling water Substances 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 16
- 239000002699 waste material Substances 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims description 4
- 239000002351 wastewater Substances 0.000 claims 1
- 239000000779 smoke Substances 0.000 abstract description 12
- 238000009833 condensation Methods 0.000 abstract description 3
- 230000005494 condensation Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 238000003287 bathing Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000008236 heating water Substances 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/50—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- 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
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
-
- 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]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention relates to the technical field of environmental protection, in particular to a system for comprehensively recovering and utilizing low-temperature waste heat, which comprises a heat discharge module, a heat pump unit and a heat utilization module; the heat discharge module comprises a boiler heating system, a circulating water system and a continuous and fixed sewage discharge system, the heat utilization module comprises a deaerator system, a chemical water treatment system, a heating boiler system and a heat supply network circulating water system, cold water in the heat pump unit is sent out through a cold water outlet pipe and is respectively sent into the boiler heating system, the circulating water system and the continuous and fixed sewage discharge system, a hot water outlet pipe and a cold water return pipe are communicated in the heat pump unit, and the hot water outlet pipe is communicated with the deaerator system, the chemical water treatment system, the heating boiler system and the heat supply network circulating water system. The invention can recover the waste heat of the flue gas, reduce the exhaust temperature of the flue gas, reduce the discharge amount of smoke dust, reduce the generation of white smoke plume of the flue gas, recover the sensible heat and the condensation latent heat of the flue gas and realize the full utilization of waste heat resources through the heat pump.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a system and a method for comprehensively recycling and utilizing low-temperature waste heat.
Background
In the combustion power generation process, fuel is combusted in a boiler, and power generation and heat supply are performed by utilizing heat generated by combustion. However, during the operation, more heat is wasted, so that the combustion utilization rate is low. The waste heat includes the following:
1. during the operation of coal-fired and gas-fired boilers, gas turbines and gas internal combustion engine power generation, heat supply or cogeneration units, the temperature of discharged flue gas is generally higher (the wet desulphurization exhaust temperature is 45-55 ℃, and the exhaust temperature of the gas boiler or the gas internal combustion engine is 80 ℃)
2. The circulating cooling water discharges low-temperature waste heat into the atmosphere through the cooling tower, and a large amount of cooling evaporation water needs to be consumed.
3. The continuous constant-discharge waste heat is used for cooling and neutralizing boiler blow-down water through the constant-discharge flash tank, a large amount of water is needed for neutralizing high-temperature sewage, the sewage is discharged into a water treatment workshop after being reduced to 30 ℃, and the sewage is recycled after being treated by the water treatment workshop.
In the process of work and life of the power plant, certain heat needs to be consumed to provide a suitable environment for equipment operation, such as:
1. at present, most of chemical water raw water of power plants needs to be heated to 25 ℃ before entering a chemical water treatment system, low-pressure steam extraction in the power plants is adopted for heating, and a large amount of energy is wasted.
2. The temperature of demineralized water inlet of the boiler deaerator is generally 25 ℃, other water which is cooled by shaft seal cooling waste heat and slag waste heat is generally 50 ℃, the demineralized water enters the deaerator, low-temperature steam is used for heating to a water treatment system 104 ℃ (or a cold water outlet pipe 150 ℃) in the deaerator, then the demineralized water enters a high-temperature heater, and then enters a main boiler after being heated, when the deaerator is used for heating, a large amount of high-grade fresh steam is used, and the reduced heat supply and power generation capacities are realized.
3. At present, most heating boilers adopt a mode of adding a plate heat exchanger by steam to heat circulating water of a heating pipe network, once high-grade fresh steam is adopted, a hot water boiler adopts high-temperature direct supply, and the supply and return water temperature of circulating water of the heating pipe network is generally 10 ℃ of a water treatment system of 50-1 ℃.
Therefore, if the heat cannot be comprehensively utilized, the operation cost of the power plant is increased, and the income is reduced, so that the existing combustion waste heat needs to be recycled.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a system for comprehensively recovering and utilizing low-temperature waste heat, which comprises a heat discharge module, a heat pump unit and a heat utilization module, wherein the heat discharge module comprises a boiler heating system, a circulating water system and a continuous sewage drainage system; the heat pump unit is internally communicated with a cold water outlet pipe and a hot water return pipe, cold water in the heat pump unit is sent out through the cold water outlet pipe and respectively sent into the boiler heating system, the circulating water system and the continuous sewage system, heat exchange is carried out among the cold water outlet pipe and the cold water, heat in the boiler heating system, the circulating water system and the continuous sewage system is absorbed, the absorbed heat in the boiler heating system, the circulating water system and the continuous sewage system is recycled into the heat pump unit through the hot water return pipe, and the heat is collected in the heat pump unit to form temperature rising water; the heat pump unit 6 is internally communicated with a hot water outlet pipe and a cold water return pipe, heating water in the heat pump unit is sent out through the hot water outlet pipe, the hot water outlet pipe is communicated with a deaerator system, a water treatment system, a heating boiler system and a heat network circulating water system, the deaerator system, the water treatment system, the heating boiler system and the heat network circulating water system supply heat, heating bathing hot water is provided, raw water for heating is heated, water enters the deaerator for heating the heating pipe network circulating water, cooling water formed after heating in the deaerator system, the water treatment system, the heating boiler system and the heat network circulating water system is communicated with the cold water return pipe through a pipeline, and the cooling water is sent back to the heat pump unit again.
Preferably, the boiler heating system comprises a boiler, a dust remover and an induced draft fan, fuel is combusted in the boiler, generated flue gas is filtered from the dust remover and then discharged through the induced draft fan, the boiler heating system is communicated with the inside of the desulfurizing tower, the flue gas generated by combustion is sent into the desulfurizing tower, desulfurization and purification treatment is carried out in the desulfurizing tower, an exhaust pipe of the desulfurizing tower is communicated in a chimney, and the treated flue gas is discharged into the external environment; the heat in the exhaust flue gas in the boiler heating system is recovered through three parts, at first is provided with first gas heater between boiler heating system and desulfurizing tower, installs the second gas heater on the blast pipe between desulfurizing tower and chimney, directly absorbs the heat in the flue gas, installs the thick liquid heat exchanger on the thick liquid pipeline of desulfurizing tower inner loop flow, absorbs the heat in the thick liquid pipeline of loop flow.
Preferably, the first flue gas heat exchanger is a plate heat exchanger, and exchanges heat with high-temperature flue gas introduced into the desulfurizing tower so as to achieve the effect of a medium-temperature heat source, and then the medium-temperature heat source is sent to a heat pump unit for utilization.
Preferably, a water circulation pipeline of the circulating water system is connected with the heat pump unit through a water circulation heat exchanger, and waste heat in circulating water is sent into a pipeline of the heat pump unit.
Preferably, a water circulation pipeline of the circulating water system is directly communicated with a pipeline of the heat pump unit, so that cooling water in the heat pump unit is directly sent into the circulating water system for use.
Preferably, the continuous fixed-displacement sewage system is connected with the heat pump unit through the continuous fixed-displacement waste heat exchanger for heat exchange, so that heat in periodic sewage discharge is absorbed and utilized, waste steam discharge and the use amount of cooling water are reduced, and meanwhile, the heat of sewage can be recovered.
A use method of a low-temperature waste heat comprehensive recovery and utilization system comprises the following steps:
s1, heat recovery, including S11, S12 and S13, as follows:
s11, conveying flue gas discharged from a boiler heating system into a desulfurizing tower through a first flue gas heat exchanger, discharging the flue gas treated in the desulfurizing tower into a chimney through a second flue gas heat exchanger, communicating the first flue gas heat exchanger and the second flue gas heat exchanger with a cold water outlet pipe and a hot water return pipe, and absorbing heat in the flue gas by cold water entering the first flue gas heat exchanger and the second flue gas heat exchanger; the slurry flowing in the desulfurizing tower absorbs the heat in the desulfurizing tower, and exchanges heat through the slurry heat exchanger, and the cold water entering the slurry heat exchanger absorbs the heat of the flue gas in the desulfurizing tower; the heat is sent back to the heat pump unit through a hot water return pipe;
s12, circulating water in the circulating water system flows, heat exchange is carried out through the water circulating heat exchanger, cold water entering the water circulating heat exchanger absorbs heat in the circulating water of the circulating water system, and the cold water is sent back to the heat pump unit through the hot water return pipe;
s13, enabling waste discharged from the continuous fixed-discharge sewage system to contact with a continuous fixed-discharge waste heat exchanger for heat exchange, enabling cold water entering the continuous fixed-discharge waste heat exchanger to absorb heat in the waste of the continuous fixed-discharge sewage system, and sending the heat back to the heat pump unit through a hot water return pipe;
s2, the temperature rising water formed in the heat pump unit is respectively sent into a deaerator system, a water treatment system, a heating boiler system and a heat supply network circulating water system, the effects of heating bathing hot water, heating raw water of the water are provided, the water enters the deaerator and heats the circulating water of the heating pipe network, and cooling water formed after heating in the deaerator system, the water treatment system, the heating boiler system and the heat supply network circulating water system is communicated with a cold water return pipe through a pipeline and is sent back to the heat pump unit again.
Compared with the prior art, the technical scheme of the invention has the following beneficial technical effects: the invention can reduce the smoke discharging temperature of the smoke by recycling the waste heat of the smoke, reduce the discharge amount of smoke dust, reduce the generation of white smoke plume of the smoke, recycle the sensible heat and the condensation latent heat of the smoke, realize the full utilization of waste heat resources by a heat pump, recycle the condensate water in the smoke and realize the functions of energy saving and water saving; the recycling of the waste heat of the circulating water can realize that the circulating water does not go into the tower or a small amount of circulating water goes into the tower to run, and the waste heat of the circulating water can be recycled, and simultaneously the water quantity of the cooling tower for cooling and evaporation can be reduced, thereby realizing the purposes of energy saving and water saving; the waste heat of the continuous and fixed discharge sewage is recycled, so that the waste steam discharge and the use amount of cooling water can be reduced, the heat of the sewage can be recycled, and the purposes of energy saving and water saving are achieved.
Drawings
Fig. 1 is a schematic structural diagram of a system for comprehensively recovering and utilizing low-temperature waste heat.
Fig. 2 is a schematic view of a partial connection structure of a system for comprehensively recovering and utilizing low-temperature waste heat.
Reference numerals: 1. a boiler heating system; 2. a desulfurizing tower; 3. a first flue gas heat exchanger; 4. a second flue gas heat exchanger; 5. a slurry heat exchanger; 6. a heat pump unit; 7. a circulating water system; 8. connecting a sewage discharge system; 9. a deaerator system; 10. a chemical water treatment system; 11. a heating boiler system; 12. a heat supply network circulating water system; 13. a plate heat exchanger; 14. connecting a fixed exhaust heat exchanger; 15. a cold water outlet pipe; 16. a hot water return pipe; 17. a hot water outlet pipe; 18. and a cold water return pipe.
Detailed Description
As shown in fig. 1-2, the system for comprehensively recovering and utilizing low-temperature waste heat provided by the invention comprises a heat discharge module, a heat pump unit 6 and a heat utilization module, wherein the heat discharge module comprises a boiler heating system 1, a circulating water system 7 and a continuous sewage drainage system 8, the heat utilization module comprises a deaerator system 9, a water treatment system 10, a heating boiler system 11 and a heat supply network circulating water system 12, and the heat discharge module and the heat utilization module are communicated in the heat pump unit 6 through pipelines, so that heat in the heat discharge module and the heat utilization module is moved by the driving of the heat pump unit 6 to realize heat utilization, and the heat pump unit 6 is a device for transferring heat energy of a low-level heat source to a high-level heat source and reutilizing the absorbed heat.
The boiler heating system 1 mainly comprises a boiler, a dust remover and an induced draft fan, fuel is combusted in the boiler, generated flue gas is filtered from the dust remover and then discharged through the induced draft fan, the boiler heating system 1 is communicated with the inside of a desulfurizing tower 2, the flue gas generated by combustion is sent into the desulfurizing tower 2, desulfurization and purification treatment is carried out in the desulfurizing tower 2, an exhaust pipe of the desulfurizing tower 2 is communicated in a chimney, and the treated flue gas is discharged to the external environment; the heat in the flue gas discharged from the boiler heating system 1 is recovered through three parts, firstly, a first flue gas heat exchanger 3 is arranged between the boiler heating system 1 and the desulfurizing tower 2, a second flue gas heat exchanger 4 is arranged on an exhaust pipe between the desulfurizing tower 2 and a chimney to directly absorb the heat in the flue gas, a slurry heat exchanger 5 is arranged on a slurry pipeline circularly flowing in the desulfurizing tower 2 to absorb the heat in the slurry pipeline circularly flowing, and the slurry pipeline is a pipeline for conveying spraying liquid in the desulfurizing tower 2; the first flue gas heat exchanger 3 is a plate heat exchanger, exchanges heat of high-temperature flue gas introduced into the desulfurizing tower 2 to achieve the effect of a medium-temperature heat source, and then sends the medium-temperature heat source to the heat pump unit 6 for utilization.
Circulating water in the circulating water system 7, a water circulating pipeline of the circulating water system 7 is connected with the heat pump unit 6 through the water circulating heat exchanger 13, waste heat in the circulating water is sent to a pipeline of the heat pump unit 6, the water circulating pipeline of the circulating water system 7 can also be directly communicated with a pipeline of the heat pump unit 6, and cooling water in the heat pump unit 6 is directly sent to the circulating water system 7 for use.
The continuous fixed-discharge sewage system 8 is connected with the heat pump unit 6 through the continuous fixed-discharge waste heat exchanger 14 for heat exchange, so that heat in periodic sewage discharge is absorbed and utilized, waste steam discharge and the use amount of cooling water are reduced, and simultaneously, the heat of sewage can be recovered.
The heat pump unit 6 is internally communicated with a cold water outlet pipe 15 and a hot water return pipe 16, cold water in the heat pump unit 6 is sent out through the cold water outlet pipe 15 and respectively sent into the boiler heating system 1, the circulating water system 7 and the continuous sewage discharging system 8, heat exchange is carried out in the boiler heating system 1, the circulating water system 7 and the continuous sewage discharging system 8, heat in the boiler heating system 1, the circulating water system 7 and the continuous sewage discharging system 8 is absorbed, then the heat is recycled into the heat pump unit 6 through the hot water return pipe 16, and the heat is collected in the heat pump unit 6 to form heating water.
The heat pump unit 6 is internally communicated with a hot water outlet pipe 17 and a cold water return pipe 18, the heating water in the heat pump unit 6 is sent out through the hot water outlet pipe 17, the hot water outlet pipe 17 is communicated with a deaerator system 9, a chemical water treatment system 10, a heating boiler system 11 and a heat supply network circulating water system 12, the deaerator system 9, the chemical water treatment system 10, the heating boiler system 11 and the heat supply network circulating water system 12 are used for supplying heat, and the functions of heating bathing hot water, heating chemical water raw water, heating deaerator water inlet and heating network circulating water are provided, cooling water formed after heating in the deaerator system 9, the chemical water treatment system 10, the heating boiler system 11 and the heat supply network circulating water system 12 is communicated with the cold water return pipe 18 through a pipeline, and the cooling water is sent back to the heat pump unit 6 again.
The use method of the system for recycling and utilizing the system comprises the following steps:
s1, heat recovery, including S11, S12 and S13, as follows:
s11, conveying flue gas discharged from the boiler heating system 1 into the desulfurizing tower 2 through the first flue gas heat exchanger 3, discharging the flue gas treated in the desulfurizing tower 2 into a chimney through the second flue gas heat exchanger 4, communicating the first flue gas heat exchanger 3 and the second flue gas heat exchanger 4 with the cold water outlet pipe 15 and the hot water return pipe 16, and absorbing heat in the flue gas by cold water entering the first flue gas heat exchanger 3 and the second flue gas heat exchanger 4; the slurry flowing in the desulfurizing tower 2 absorbs the heat in the desulfurizing tower 2, and exchanges heat through the slurry heat exchanger 5, and the cold water entering the slurry heat exchanger 5 absorbs the heat of the flue gas in the desulfurizing tower 2; the heat is sent back to the heat pump unit 6 through the hot water return pipe 16;
s12, circulating water in the circulating water system 7 flows, heat exchange is carried out through the water circulating heat exchanger 13, cold water entering the water circulating heat exchanger 13 absorbs heat in the circulating water system 7, and the cold water is returned to the heat pump unit 6 through the hot water return pipe 16;
s13, enabling waste discharged from the continuous fixed-discharge sewage system 8 to contact with the continuous fixed-discharge waste heat exchanger 14 for heat exchange, enabling cold water entering the continuous fixed-discharge waste heat exchanger 14 to absorb heat in the waste of the continuous fixed-discharge sewage system 8, and enabling the cold water to be sent back to the heat pump unit 6 through the hot water return pipe 16;
s2, the temperature rising water formed in the heat pump unit 6 is respectively sent into the deaerator system 9, the water treatment system 10, the heating boiler system 11 and the heat supply network circulating water system 12, the functions of heating bath hot water, heating raw water of the water are provided, the deaerator is heated to feed water and heating circulating water of the heating pipe network are provided, the cooling water formed after heating in the deaerator system 9, the water treatment system 10, the heating boiler system 11 and the heat supply network circulating water system 12 is communicated with the cold water return pipe 18 through a pipeline, and the cooling water is sent back to the heat pump unit 6 again.
By the design of the invention, the recovery of the waste heat of the flue gas can reduce the temperature of the discharged flue gas of the flue gas, reduce the discharge amount of the smoke dust, reduce the generation of white smoke plume of the flue gas, simultaneously recover the sensible heat and the latent heat of condensation of the flue gas, realize the full utilization of waste heat resources through a heat pump, simultaneously recover the condensed water in the flue gas, and realize the functions of energy saving and water saving; the recycling of the waste heat of the circulating water can realize that the circulating water does not go into the tower or a small amount of circulating water goes into the tower to run, and the waste heat of the circulating water can be recycled, and simultaneously the water quantity of the cooling tower for cooling and evaporation can be reduced, thereby realizing the purposes of energy saving and water saving; the waste heat of the continuous and fixed discharge sewage is recycled, so that the waste steam discharge and the use amount of cooling water can be reduced, the heat of the sewage can be recycled, and the purposes of energy saving and water saving are achieved.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (7)
1. A system for comprehensively recovering and utilizing low-temperature waste heat is characterized by comprising a heat discharge module, a heat pump unit (6) and a heat utilization module;
the heat discharge module comprises a boiler heating system (1), a circulating water system (7) and a continuous fixed-discharge sewage system (8), the heat utilization module comprises a deaerator system (9), a water treatment system (10), a heating boiler system (11) and a heat supply network circulating water system (12), a cold water outlet pipe (15) and a hot water return pipe (16) are communicated in the heat pump unit (6), cold water in the heat pump unit (6) is sent out through the cold water outlet pipe (15) and is respectively sent into the boiler heating system (1), the circulating water system (7) and the continuous fixed-discharge sewage system (8), and heat in the boiler heating system (1), the circulating water system (7) and the continuous fixed-discharge sewage system (8) is absorbed and is recycled into the heat pump unit (6) through the hot water return pipe (16); heat pump set (6) in-connection has hot water outlet pipe (17) and cold water return pipe (18), the intensification water in heat pump set (6) is seen off through hot water outlet pipe (17), hot water outlet pipe (17) intercommunication is at oxygen-eliminating device system (9), change water processing system (10), heating boiler system (11), heat supply network circulating water system (12), the cooling water that intensification water formed after heating in oxygen-eliminating device system (9), change water processing system (10), heating boiler system (11), heat supply network circulating water system (12) passes through pipeline and cold water return pipe (18) in intercommunication, send the cooling water back to heat pump set (6) in.
2. The system for comprehensively recovering and utilizing the low-temperature waste heat according to claim 1, characterized in that the boiler heating system (1) comprises a boiler, a dust remover and an induced draft fan, the boiler heating system (1) is communicated with the inside of the desulfurizing tower (2), the flue gas generated by combustion is sent into the desulfurizing tower (2), the exhaust pipe of the desulfurizing tower (2) is communicated with a chimney, a first flue gas heat exchanger (3) is arranged between the boiler heating system (1) and the desulfurizing tower (2), a second flue gas heat exchanger (4) is arranged on the exhaust pipe between the desulfurizing tower (2) and the chimney, and a slurry heat exchanger (5) is arranged on a slurry pipeline which circularly flows in the desulfurizing tower (2).
3. The system for comprehensively recycling and utilizing low-temperature waste heat according to claim 2, characterized in that the first flue gas heat exchanger (3) is a plate heat exchanger.
4. The system for comprehensively recovering and utilizing low-temperature waste heat according to claim 1, wherein a water circulation pipeline of the circulating water system (7) is connected with the heat pump unit (6) through a water circulation heat exchanger (13).
5. The system for comprehensively recovering and utilizing low-temperature waste heat according to claim 1, wherein a water circulation pipeline of the circulating water system (7) is directly communicated with a pipeline of the heat pump unit (6).
6. The system for comprehensively recovering and utilizing low-temperature waste heat according to claim 1, wherein the continuous waste water discharge system (8) is connected with the heat pump unit (6) through a continuous waste heat discharge heat exchanger (14).
7. The use method of the system for comprehensively recovering and utilizing the low-temperature waste heat according to any one of claims 1 to 6, characterized by comprising the following steps of:
s1, heat recovery, including S11, S12 and S13, as follows:
s11, conveying flue gas discharged from a boiler heating system (1) into a desulfurizing tower (2) through a first flue gas heat exchanger (3), discharging the flue gas treated in the desulfurizing tower (2) into a chimney through a second flue gas heat exchanger (4), communicating the first flue gas heat exchanger (3) and the second flue gas heat exchanger (4) with a cold water outlet pipe (15) and a hot water return pipe (16), and absorbing heat in the flue gas by cold water entering the first flue gas heat exchanger (3) and the second flue gas heat exchanger (4); the slurry flowing in the desulfurizing tower (2) absorbs the heat in the desulfurizing tower (2), and the cold water entering the slurry heat exchanger (5) absorbs the heat of the flue gas in the desulfurizing tower (2) through the heat exchange of the slurry heat exchanger (5); the heat is sent back to the heat pump unit (6) through a hot water return pipe (16);
s12, circulating water in the circulating water system (7) flows, heat exchange is carried out through the water circulating heat exchanger (13), cold water entering the water circulating heat exchanger (13) absorbs heat in the circulating water of the circulating water system (7), and the cold water is sent back to the heat pump unit (6) through the hot water return pipe (16);
s13, enabling waste discharged from the continuous fixed-discharge sewage system (8) to contact with a continuous fixed-discharge waste heat exchanger (14) for heat exchange, enabling cold water entering the continuous fixed-discharge waste heat exchanger (14) to absorb heat in the waste of the continuous fixed-discharge sewage system (8), and enabling the cold water to be sent back to the heat pump unit (6) through a hot water return pipe (16);
s2, the temperature rising water formed in the heat pump unit (6) is respectively sent into the deaerator system (9), the chemical water treatment system (10), the heating boiler system (11) and the heat supply network circulating water system (12), heating bath hot water is provided, raw water for heating chemical water is heated, heating deaerator water is fed in, heating pipe network circulating water is heated, the cooling water formed after heating in the deaerator system (9), the chemical water treatment system (10), the heating boiler system (11) and the heat supply network circulating water system (12) is communicated with the interior of the cold water return pipe (18) through a pipeline, and the cooling water is sent back to the heat pump unit (6) again.
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