CN106016814A - Series-parallel connection coupling absorption type heat pump system - Google Patents
Series-parallel connection coupling absorption type heat pump system Download PDFInfo
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- CN106016814A CN106016814A CN201610330697.8A CN201610330697A CN106016814A CN 106016814 A CN106016814 A CN 106016814A CN 201610330697 A CN201610330697 A CN 201610330697A CN 106016814 A CN106016814 A CN 106016814A
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 41
- 230000008878 coupling Effects 0.000 title claims abstract description 31
- 238000010168 coupling process Methods 0.000 title claims abstract description 31
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 112
- 239000000498 cooling water Substances 0.000 claims abstract description 87
- 239000002918 waste heat Substances 0.000 claims abstract description 73
- 239000000779 smoke Substances 0.000 claims abstract description 40
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000011084 recovery Methods 0.000 claims description 33
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 20
- 239000003546 flue gas Substances 0.000 claims description 20
- 239000006096 absorbing agent Substances 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 14
- 238000006477 desulfuration reaction Methods 0.000 claims description 11
- 230000023556 desulfurization Effects 0.000 claims description 11
- 238000000605 extraction Methods 0.000 claims description 11
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000003517 fume Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
-
- 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
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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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
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
-
- 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
- F25B2315/00—Sorption refrigeration cycles or details thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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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)
- Materials Engineering (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention provides a series-parallel connection coupling absorption type heat pump system which comprises a steam exhaustion subsystem, a smoke exhaustion subsystem and a heat pump subsystem. The steam exhaustion subsystem increases the temperature of circulating cooling water through steam exhaustion waste heat of a steam turbine. The smoke exhaustion subsystem further increases the temperature of the circulating cooling water through the smoke exhaustion waste heat of a boiler. The heat pump subsystem comprises a high-pressure heat pump and a low-pressure heat pump. The extracted steam of the steam turbine serves as a high-temperature driving heat source, the circulating cooling water serves as a low-temperature heat source, and the medium-temperature heating network water is heated. A condenser and a waste heat recycling heat exchanger of the series-parallel connection coupling absorption type heat pump system are connected in series, the utilization efficiency of energy sources is improved, and waste heat waste and thermal pollution are reduced; and the high-pressure heat pump and the low-pressure heat pump collect the extracted steam of the steam turbine in parallel, no secondary heat exchanger needs to be additionally arranged, the effect that the temperature of the heating network water meets the index requirement of primary heating network water can be directly achieved, the proportion of the heating amount of the heat pumps in a whole heating system is increased, and energy sources are further saved.
Description
Technical Field
The invention relates to the technical field of low-temperature waste heat utilization of power plants, in particular to a series-parallel connection coupling absorption heat pump system.
Background
More than 60% of heat energy in a conventional power plant is mainly dissipated to the environment through boiler exhaust and circulating water of a condenser, so that a large amount of energy waste and heat pollution are caused, and therefore, the waste heat utilization significance is great.
The absorption heat pump is an important device for recycling medium-low grade waste heat by utilizing the absorption and circulation of working media, and has double purposes of clean production, energy conservation and consumption reduction. The COP of the first lithium bromide absorption heat pump is about 1.7, and the heat supply capacity of the heat pump driven by steam extracted by the steam turbine is increased by about 70 percent compared with the prior art, so that the problem of waste heat resource waste of a power plant can be partially solved, the heat supply capacity can be greatly improved, the heat supply pressure is relieved, and the comprehensive utilization rate of energy is improved. A first-class lithium bromide absorption heat pump is widely adopted in various thermal power plants for heat supply system transformation, steam extracted by a steam turbine is used as a driving heat source of an absorption heat pump unit, and a heat pump is driven to recover low-grade waste heat of circulating water to heat network water. However, the absorption heat pump can only raise the temperature of the return water of the heat supply network (about 50 ℃) to 70-80 ℃, and can not meet the index requirement (more than 90 ℃) of the water heat supply of the primary heat supply network. The general solution is that the heat pump is used to heat the water in the heat supply network to a certain intermediate temperature, then the original turbine extracts steam to heat the water to the heating temperature and then the heated water is supplied to the municipal pipe network, the heat pump heat supply accounts for only about 50% of the whole heating system, and the energy-saving potential of the heat pump is not really exerted.
Disclosure of Invention
Technical problem to be solved
In view of the above, the present invention provides a series-parallel coupling absorption heat pump system.
(II) technical scheme
The invention provides a series-parallel connection coupling absorption heat pump system, which is used for recovering waste heat of exhaust smoke Y1 of a boiler and exhaust steam s3 and extraction steam s2 of a steam turbine, and comprises the following components: the system comprises an exhaust steam utilization subsystem, an exhaust smoke utilization subsystem and a heat pump subsystem; the exhaust steam utilization subsystem receives exhaust steam s3 of the steam turbine and utilizes the exhaust steam waste heat of the steam turbine to raise the temperature of the circulating cooling water; the exhaust smoke utilization subsystem is connected with the exhaust steam utilization subsystem in series, receives exhaust smoke Y1 of the boiler, and further raises the temperature of the circulating cooling water by using the waste heat of the exhaust smoke of the boiler; the heat pump subsystem, it connects the exhaust gas utilization subsystem and exhaust gas utilization subsystem, includes: the high-pressure heat pump 7 and the low-pressure heat pump 6 receive the extraction steam s2 of the steam turbine in parallel, the heat pump subsystem takes the extraction steam s2 of the steam turbine as a high-temperature driving heat source, the circulating cooling water conveyed by the exhaust subsystem is a low-temperature heat source, the medium-temperature heat network water is heated, and the circulating cooling water with the reduced temperature is sent back to the exhaust utilization subsystem.
Preferably, the exhaust utilization subsystem includes: and the air inlet of the condenser 4 is connected with the steam exhaust port of the steam turbine, the condensed water at the water outlet of the condenser is used as boiler water supply, the cold source inlet of the condenser is connected with the low-pressure heat pump 6, and the cold source outlet of the condenser is connected with the smoke exhaust utilization subsystem.
Preferably, the condenser receives exhaust steam S3, and recirculated cooling water L4 is discharged to its cold source entry, the condenser utilizes the exhaust steam waste heat to carry out the first heating to recirculated cooling water L4, promotes recirculated cooling water' S temperature to send the recirculated cooling water L2 after the temperature rise to the subsystem is utilized in discharging fume, becomes condensate water S8 behind the condenser exhaust steam S3, and condensate water S8 is as boiler feed water.
Preferably, the exhaust gas utilization subsystem includes: the waste heat recovery heat exchanger 8 and the flue gas desulfurization device 3, the air inlet of the waste heat recovery heat exchanger is connected with the smoke outlet of the boiler, the air outlet of the waste heat recovery heat exchanger is connected with the air inlet of the flue gas desulfurization device, the water inlet of the waste heat recovery heat exchanger is connected with the cold source outlet of the exhaust steam utilization subsystem, and the water outlet of the waste heat recovery heat exchanger is connected with the high-.
Preferably, the waste heat recovery heat exchanger 8 receives the flue gas Y1, the flue gas waste heat is used for heating the circulating cooling water L2 with the increased temperature for the second time, the temperature of the circulating cooling water is further increased, the circulating cooling water L7 with the further increased temperature is sent to the high-pressure heat pump 7, the flue gas Y1 becomes low-temperature flue gas Y2 after passing through the waste heat recovery heat exchanger 8, and the low-temperature flue gas Y2 becomes low-sulfur flue gas Y3 after being treated by the flue gas desulfurization device 3.
Preferably, the high-pressure heat pump 7 and the low-pressure heat pump 6 of the heat pump subsystem are both a first type of heating absorption heat pump, and the high-pressure heat pump 7 includes: a first generator G1, a first evaporator E1, a first absorber a1 and a first condenser C1, the low pressure heat pump 6 comprising: a second generator G2, a second evaporator E2, a second absorber a2, and a second condenser C2; the air inlet of the first generator and the air inlet of the second generator are connected with a steam extraction port of the steam turbine in parallel, the water inlet of the first evaporator is connected with the water outlet of the exhaust steam utilization subsystem, the water outlet of the first evaporator is connected with the water inlet of the second evaporator, the water outlet of the second evaporator is connected with the cold source inlet of the exhaust steam utilization subsystem, and the water outlet of the second condenser is connected with the water inlet of the first absorber.
Preferably, the extraction s2 of the turbine is divided into two streams: the first steam S4 and the second steam S5 enter a first generator G1 of the high-pressure heat pump and a second generator G2 of the low-pressure heat pump in parallel, the circulating cooling water L8 discharged by the first evaporator after temperature reduction enters a second evaporator E2 of the low-pressure heat pump, the second steam S5 is used as a high-temperature driving heat source, the circulating cooling water L8 after temperature reduction is used as a low-temperature heat source, the medium-temperature heat network water W1 is subjected to temperature rise after sequentially passing through a second absorber A2 and a second condenser C2 of the low-pressure heat pump to become heat network water W2 after temperature rise, and the second steam S7 after heat release is condensed to be used as boiler water supply; the first steam S4 is used as a high-temperature driving heat source, the circulating cooling water L7 with further increased temperature conveyed by the exhaust gas utilization subsystem is used as a low-temperature heat source, the heated heat supply network water W2 sequentially passes through a first absorber A1 and a first condenser C1 of the high-pressure heat pump, the temperature is further increased to form heat supply network water supply W3 meeting the primary heat supply network water index requirement, the first steam S6 with heat release is condensed to be used as boiler water supply, and the circulating cooling water L4 discharged by a second evaporator E2 enters the exhaust gas utilization subsystem to realize circulating work.
Preferably, the exhaust steam utilization subsystem further comprises: the water inlet of the cooling device 5 is connected with the cold source outlet of the condenser, and the water outlet of the cooling device is connected with the cold source inlet of the condenser; the condenser receives exhaust steam s3 and utilizes exhaust steam waste heat to heat circulating cooling water L1 for the first time, the temperature of the circulating cooling water is raised, the circulating cooling water L2 with the raised temperature is divided into two parts, one part of the circulating cooling water L3 with the raised temperature is sent to the exhaust steam utilization subsystem, the other part of the circulating cooling water L6 with the raised temperature is sent to the cooling device 5, the temperature of the circulating cooling water L6 is lowered after the cooling device 5, the circulating cooling water L5 with the lowered temperature is mixed with the circulating cooling water L4 from the low-pressure heat pump, the mixed circulating cooling water L1 is sent to the condenser, the exhaust steam s3 is changed into condensed water s8 after passing through the condenser, and the condensed water s8 is used as boiler feed water.
Preferably, lithium bromide and water are used as a working substance pair for the low-pressure heat pump and the high-pressure heat pump.
Preferably, the waste heat recovery heat exchanger 8 is made of a material resistant to sulfuric acid dew point corrosion.
(III) advantageous effects
According to the technical scheme, the series-parallel connection coupling absorption heat pump system has the following beneficial effects:
(1) the condenser is connected with the waste heat recovery heat exchanger in series, the circulating cooling water can exchange heat with the steam turbine exhaust steam and the boiler exhaust steam in sequence, the boiler exhaust steam waste heat and the steam turbine exhaust steam waste heat are fully absorbed, the energy utilization efficiency is improved, and waste heat waste and heat pollution are reduced;
(2) the high-pressure heat pump and the low-pressure heat pump receive extracted steam of the steam turbine in parallel, and two-stage heating is carried out on the return water of the heat supply network in sequence, so that the temperature of the heat supply network can directly meet the index requirement of primary heat supply network water without adding a secondary heat exchanger, the share of the heat supply amount of the heat pump in the whole heat supply system is improved, and the energy is further saved;
(3) the heat supply capacity is improved by about 20 percent compared with the prior art, the heat supply pressure can be relieved, and the energy utilization rate is improved;
(4) through setting up a cooling device, can be according to practical application scene, cool off partly recirculated cooling water, improved the flexibility of series-parallel connection coupling absorption heat pump system, can be applied to multiple occasion.
Drawings
Fig. 1 is a schematic structural diagram of a series-parallel coupling absorption heat pump system according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a series-parallel coupling absorption heat pump system according to a second embodiment of the present invention.
Description of the symbols
1-a boiler; 2-a steam turbine; 3-a flue gas desulfurization unit; 4-a condenser; 5-a cooling device; 6-low pressure heat pump; 7-a high pressure heat pump; 8-a waste heat recovery heat exchanger;
l1, L2, L3, L4, L5, L6, L7, L8-circulating cooling water;
s 1-steam; s2-extracting steam; s 3-steam exhaust; s4 — first steam; s5 — second steam; s6-first steam after heat release; s7-second steam after heat release; s8-condensed water;
w-work output; y1-smoke exhaust; y2-low temperature flue gas; y3-low sulfur flue gas; w1-medium temperature heat supply network water; w2-heated heat supply network water; W3-Water supply of heat supply network;
g1-first generator; e1-first evaporator; a1 — first absorber; c1 — first condenser; g2 — second generator; e2 — second evaporator; a2 — second absorber; c2 — second condenser.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
As shown in fig. 1, fig. 1 is a series-parallel coupling absorption heat pump system according to a first embodiment of the present invention, which includes: the system comprises an exhaust steam utilization subsystem, an exhaust smoke utilization subsystem and a heat pump subsystem; wherein,
the exhaust steam utilization subsystem receives the exhaust steam of the steam turbine and utilizes the exhaust steam waste heat of the steam turbine to increase the temperature of the circulating cooling water;
the exhaust smoke utilization subsystem is connected with the exhaust steam utilization subsystem in series and used for receiving the exhaust smoke of the boiler and further increasing the temperature of the circulating cooling water by using the waste heat of the exhaust smoke of the boiler;
and the heat pump subsystem is connected with the exhaust gas utilization subsystem and comprises a high-pressure heat pump 7 and a low-pressure heat pump 6, the high-pressure heat pump 7 and the low-pressure heat pump 6 receive the extracted steam of the steam turbine in parallel, the heat pump subsystem takes the extracted steam of the steam turbine as a high-temperature driving heat source, the circulating cooling water conveyed by the exhaust gas subsystem as a low-temperature heat source, heats the medium-temperature heat network water, and sends the circulating cooling water with the reduced temperature back to the exhaust gas utilization subsystem.
The following describes each component of the series-parallel coupling absorption heat pump system of the present embodiment in detail.
The exhaust steam utilization subsystem comprises a condenser 4, wherein the air inlet of the condenser is connected with the exhaust steam port of the steam turbine, the condensed water at the water outlet of the condenser is used as boiler feed water, the cold source inlet of the condenser is connected with the heat pump subsystem, and the cold source outlet of the condenser is connected with the exhaust steam utilization subsystem.
The condenser 4 is a heat exchange device, receives exhaust steam delivered by an exhaust steam port of the steam turbine, and heats the circulating cooling water for the first time by using exhaust steam waste heat, so that the temperature of the circulating cooling water is raised.
The exhaust gas utilization subsystem comprises a waste heat recovery heat exchanger 8 and a flue gas desulfurization device 3, wherein the air inlet of the waste heat recovery heat exchanger is connected with the smoke outlet of the boiler, the air outlet of the waste heat recovery heat exchanger is connected with the air inlet of the flue gas desulfurization device, the air outlet of the flue gas desulfurization device can be connected with a dust removal device, the water inlet of the flue gas desulfurization device is connected with the cold source outlet of the exhaust gas utilization subsystem, and the water outlet of the flue gas.
The waste heat recovery heat exchanger 8 is a heat exchange device, receives the exhaust smoke delivered by the boiler exhaust smoke port, and heats the primarily heated circulating cooling water for the second time by using the waste heat of the exhaust smoke, so as to further raise the temperature of the circulating cooling water.
The high-pressure heat pump 7 and the low-pressure heat pump 6 of the heat pump subsystem are first-type heat-increasing absorption heat pumps, and the high-pressure heat pump 7 comprises: a first generator G1, a first evaporator E1, a first absorber a1 and a first condenser C1, the low pressure heat pump 6 comprising: the system comprises a second generator G2, a second evaporator E2, a second absorber A2 and a second condenser C2, wherein an air inlet of the first generator and an air inlet of the second generator are connected with a steam turbine steam extraction port in parallel, condensed water at air outlets of the first generator and the second generator is used as boiler feed water, a water inlet of the first evaporator is connected with a water outlet of a waste heat recovery heat exchanger, a water outlet of the first evaporator is connected with a water inlet of the second evaporator, a water outlet of the second evaporator is connected with a cold source inlet of the condenser, and a water outlet of the second condenser is connected with a water inlet of the first absorber.
The first generator G1 of the high-pressure heat pump and the second generator G2 of the low-pressure heat pump receive the extracted steam of the steam turbine in parallel, the circulating cooling water conveyed by the waste heat recovery heat exchanger enters the first evaporator E1 of the high-pressure heat pump and the second evaporator E2 of the low-pressure heat pump in sequence, and the return water of the heat supply network water passes through the second absorber A2 and the second condenser C2 of the low-pressure heat pump in sequence, and the first absorber A1 and the first condenser C1 of the high-pressure heat pump in sequence to become water supply of the heat supply network.
In this embodiment, the boiler 1 may be a coal-fired boiler, a circulating fluidized bed boiler, a waste heat boiler in a gas-steam combined cycle, etc., and steam s1 generated by the boiler enters the steam turbine 2 to do work; lithium bromide and water are used as a working medium pair of the low-pressure heat pump and the high-pressure heat pump, the evaporation pressure and the evaporation temperature of the high-pressure heat pump are higher than those of the low-pressure heat pump, and the high-pressure heat pump needs a higher low-temperature heat source, so that circulating cooling water conveyed by the waste heat recovery heat exchanger firstly enters the high-pressure heat pump 7 and then enters the low-pressure heat pump 6; the waste heat recovery heat exchanger 8 is made of a material resistant to sulfuric acid dew point corrosion.
In the series-parallel connection coupling absorption heat pump system of the first embodiment of the invention, steam S1 generated by the boiler enters the steam turbine 2 to do work, the work output of the steam turbine 2 is W, the boiler 1 generates exhaust smoke Y1, and the steam turbine 2 generates exhaust steam S3; the condenser receives exhaust steam S3, a cold source inlet of the condenser discharges circulating cooling water L4, the condenser heats the circulating cooling water L4 for the first time by using exhaust steam waste heat, the temperature of the circulating cooling water is raised, the circulating cooling water L2 with the raised temperature is sent to the waste heat recovery heat exchanger 8, the exhaust steam S3 becomes condensed water S8 after passing through the condenser, and the condensed water S8 can be used as boiler feed water; the waste heat recovery heat exchanger 8 receives the exhaust smoke Y1, the circulating cooling water L2 which is heated for the first time is heated for the second time by using the waste heat of the exhaust smoke, the temperature of the circulating cooling water is further increased, the circulating cooling water L7 of which the temperature is further increased is sent to a first evaporator E1 of the high-pressure heat pump, the exhaust smoke Y1 becomes low-temperature smoke Y2 after passing through the waste heat recovery heat exchanger 8, and the low-temperature smoke Y2 becomes low-sulfur smoke Y3 after being processed by the smoke desulfurization device 3 and is emptied; the turbine extraction s2 is split into two streams: the first steam s4 and the second steam s5 enter a first generator G1 of the high-pressure heat pump and a second generator G2 of the low-pressure heat pump in parallel, the circulating cooling water L8 discharged by the first evaporator after temperature reduction enters a second evaporator E2 of the low-pressure heat pump, the second steam s5 serves as a high-temperature driving heat source, the circulating cooling water L8 after temperature reduction serves as a low-temperature heat source, the medium-temperature heat supply network water W1 sequentially passes through a second absorber A2 and a second condenser C2 of the low-pressure heat pump to increase in temperature to become heat supply network water W2 after temperature rise, and the second steam s7 after heat release is exhausted; the first steam s4 is used as a high-temperature driving heat source, the circulating cooling water L7 with the further increased temperature is used as a low-temperature heat source, the heated heat supply network water W2 sequentially passes through a first absorber A1 and a first condenser C1 of the high-pressure heat pump, the temperature is further increased to form heat supply network water supply W3 meeting the primary heat supply network water index requirement, the first steam s6 after heat release is exhausted, and the circulating cooling water L4 discharged by a second evaporator E2 enters the condenser to realize circulating work, wherein the temperature of the medium-temperature heat supply network water W1 is about 50 ℃, and the temperature of the heat supply network water supply W3 is about 90-100 ℃.
In the series-parallel coupling absorption heat pump system of the first embodiment of the invention, the condenser is connected with the waste heat recovery heat exchanger in series, the circulating cooling water can exchange heat with the exhaust steam of the steam turbine and the exhaust steam of the boiler in sequence, the waste heat of the exhaust steam of the boiler and the waste heat of the exhaust steam of the steam turbine can be fully absorbed, the energy utilization efficiency is improved, and the waste heat waste and the heat pollution are reduced; the high-pressure heat pump and the low-pressure heat pump receive extracted steam of the steam turbine in parallel, and two-stage heating is carried out on the return water of the heat supply network in sequence, so that the temperature of the heat supply network can directly meet the index requirement of primary heat supply network water without adding a secondary heat exchanger, the share of the heat supply amount of the heat pump in the whole heat supply system is improved, and the energy is further saved; the series-parallel coupling absorption heat pump system of the first embodiment of the invention has the advantages that the heat supply capacity is improved by about 20% compared with the prior art, the heat supply pressure can be relieved, and the energy utilization rate is improved.
For the purpose of brief description, any technical features of the first embodiment that can be applied to the same will be described herein, and the same description need not be repeated.
As shown in fig. 2, the exhaust utilization subsystem further includes: and a water inlet of the cooling device 5 is connected with a cold source outlet of the condenser, and a water outlet of the cooling device is connected with a cold source inlet of the condenser.
The condenser heats the circulating cooling water L1 for the first time by utilizing waste heat of exhausted steam, the temperature of the circulating cooling water is increased, the circulating cooling water L2 with the increased temperature is divided into two parts, one part of the circulating cooling water L3 with the increased temperature is sent to the waste heat recovery heat exchanger 8, the other part of the circulating cooling water L6 with the increased temperature is sent to the cooling device 5, the temperature of the circulating cooling water L6 with the decreased temperature is reduced after passing through the cooling device 5, the circulating cooling water L5 with the decreased temperature is mixed with the circulating cooling water L4 from the second evaporator of the low-pressure heat pump, and the mixed circulating cooling water L1 is sent to the condenser, so that the circulating operation is realized in a circulating mode.
The series-parallel connection coupling absorption heat pump system provided by the second embodiment of the invention is suitable for the situation that the exhaust waste heat of the steam turbine cannot be completely recovered, and by arranging the cooling device, a part of circulating water can be cooled by the cooling device according to the actual application scene, namely, part of the exhaust waste heat of the steam turbine but not all the exhaust waste heat of the steam turbine is used for heating heat supply network water, so that the flexibility of the series-parallel connection coupling absorption heat pump system is improved, the series-parallel connection coupling absorption heat pump system can be applied to various occasions, and the cooling device can be a cooling.
It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. In addition, the above definitions of the components are not limited to the specific structures and shapes mentioned in the embodiments, and those skilled in the art may easily modify or replace them, for example:
(1) each subsystem can also adopt other equipment as long as the same function can be completed;
(2) examples of parameters that include particular values may be provided herein, but the parameters need not be exactly equal to the corresponding values, but may be approximated to the corresponding values within acceptable error tolerances or design constraints;
(3) directional phrases used in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., refer only to the orientation of the attached drawings and are not intended to limit the scope of the present invention;
(4) the embodiments described above may be mixed and matched with each other or with other embodiments based on design and reliability considerations, i.e. technical features in different embodiments may be freely combined to form further embodiments.
In summary, according to the series-parallel coupling absorption heat pump system provided by the invention, the condenser is connected in series with the waste heat recovery heat exchanger, the circulating cooling water can sequentially exchange heat with the exhaust steam of the steam turbine and the exhaust steam of the boiler, the waste heat of the exhaust steam of the boiler and the waste heat of the exhaust steam of the steam turbine can be fully absorbed, the energy utilization efficiency is improved, and the waste heat waste and the heat pollution are reduced; the high-pressure heat pump and the low-pressure heat pump receive extracted steam of the steam turbine in parallel, and two-stage heating is carried out on the return water of the heat supply network in sequence, so that the temperature of the heat supply network can directly meet the index requirement of primary heat supply network water without adding a secondary heat exchanger, the share of the heat supply amount of the heat pump in the whole heat supply system is improved, and the energy is further saved; the series-parallel coupling absorption heat pump system of the first embodiment of the invention has the advantages that the heat supply capacity is improved by about 20% compared with the prior art, the heat supply pressure can be relieved, and the energy utilization rate is improved; through setting up a cooling device, can be according to the practical application scene, have the cooling device recovery with some recirculated cooling water, partial rather than whole turbine exhaust waste heat is used for heating the heat supply network water promptly, has improved the flexibility of series-parallel connection coupling absorption heat pump system, can be applied to multiple occasion, provides the heat source for multiple system.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A series-parallel coupled absorption heat pump system for recovering waste heat from boiler exhaust (Y1) and turbine exhaust (S3) and steam extraction (S2), comprising: the system comprises an exhaust steam utilization subsystem, an exhaust smoke utilization subsystem and a heat pump subsystem; wherein,
the exhaust steam utilization subsystem receives exhaust steam of the steam turbine (S3), and raises the temperature of the circulating cooling water by using exhaust steam waste heat of the steam turbine;
the exhaust smoke utilization subsystem is connected with the exhaust steam utilization subsystem in series, receives exhaust smoke (Y1) of the boiler, and further raises the temperature of the circulating cooling water by using the waste heat of the exhaust smoke of the boiler;
the heat pump subsystem, it connects the exhaust gas utilization subsystem and exhaust gas utilization subsystem, includes: the high-pressure heat pump (7) and the low-pressure heat pump (6) receive the extracted steam (S2) of the steam turbine in parallel, the heat pump subsystem takes the extracted steam (S2) of the steam turbine as a high-temperature driving heat source, and the circulating cooling water conveyed by the exhaust subsystem is used as a low-temperature heat source to heat the medium-temperature heat supply network water, and the circulating cooling water with the reduced temperature is sent back to the exhaust utilization subsystem.
2. The series-parallel coupling absorption heat pump system of claim 1, wherein the exhaust utilization subsystem comprises: the condenser (4), the condenser air inlet is connected the steam extraction mouth of steam turbine, and the condensate water of its delivery port is as boiler feed water, and its cold source entry is connected low pressure heat pump (6), its cold source exit linkage utilize the subsystem to discharge fume.
3. The series-parallel coupling absorption heat pump system according to claim 2, wherein the condenser receives exhaust steam (S3), circulating cooling water (L4) is discharged from a cold source inlet of the condenser, the condenser heats the circulating cooling water (L4) for the first time by using exhaust steam waste heat, the temperature of the circulating cooling water is raised, the circulating cooling water (L2) with the raised temperature is sent to the exhaust steam utilization subsystem, the exhaust steam (S3) becomes condensed water (S8) after passing through the condenser, and the condensed water (S8) serves as boiler feed water.
4. The series-parallel coupling absorption heat pump system of claim 1, wherein the flue gas utilization subsystem comprises: the waste heat recovery heat exchanger (8) and the flue gas desulfurization device (3), wherein the air inlet of the waste heat recovery heat exchanger is connected with the smoke outlet of the boiler, the air outlet of the waste heat recovery heat exchanger is connected with the air inlet of the flue gas desulfurization device, the water inlet of the waste heat recovery heat exchanger is connected with the cold source outlet of the exhaust steam utilization subsystem, and the water outlet of the waste heat recovery heat exchanger is connected with the high.
5. The series-parallel coupling absorption heat pump system according to claim 4, wherein the waste heat recovery heat exchanger (8) receives the exhaust smoke (Y1), the exhaust smoke waste heat is used for carrying out secondary heating on the circulating cooling water (L2) with the increased temperature, the temperature of the circulating cooling water is further increased, the circulating cooling water (L7) with the further increased temperature is sent to the high-pressure heat pump (7), the exhaust smoke (Y1) becomes low-temperature smoke (Y2) after passing through the waste heat recovery heat exchanger (8), and the low-temperature smoke (Y2) becomes low-sulfur smoke (Y3) after being treated by the smoke desulfurizer (3).
6. The series-parallel coupling absorption heat pump system according to claim 1, wherein the high pressure heat pump (7) and the low pressure heat pump (6) of the heat pump subsystem are both a first type of heat-increasing absorption heat pump, and the high pressure heat pump (7) comprises: -a first generator (G1), -a first evaporator (E1), -a first absorber (a1) and-a first condenser (C1), the low-pressure heat pump (6) comprising: a second generator (G2), a second evaporator (E2), a second absorber (a2), and a second condenser (C2); wherein,
the air inlet of the first generator and the air inlet of the second generator are connected with a steam extraction port of the steam turbine in parallel, the water inlet of the first evaporator is connected with the water outlet of the exhaust steam utilization subsystem, the water outlet of the first evaporator is connected with the water inlet of the second evaporator, the water outlet of the second evaporator is connected with the cold source inlet of the exhaust steam utilization subsystem, and the water outlet of the second condenser is connected with the water inlet of the first absorber.
7. The series-parallel coupling absorption heat pump system according to claim 6, wherein the steam extraction (S2) of the steam turbine is split into two streams: the method comprises the following steps that first steam (S4) and second steam (S5) enter a first generator (G1) of a high-pressure heat pump and a second generator (G2) of a low-pressure heat pump in parallel, circulating cooling water (L8) discharged by the first evaporator after temperature reduction enters a second evaporator (E2) of the low-pressure heat pump, the second steam (S5) serves as a high-temperature driving heat source, the circulating cooling water (L8) after temperature reduction serves as a low-temperature heat source, medium-temperature heat network water (W1) sequentially passes through a second absorber (A2) and a second condenser (C2) of the low-pressure heat pump to be subjected to temperature rise to become heated heat network water (W2), and the second steam (S7) after heat release is condensed to serve as boiler feed water; the first steam (S4) is used as a high-temperature driving heat source, the circulating cooling water (L7) which is conveyed by the exhaust gas utilization subsystem and has further increased temperature is used as a low-temperature heat source, the heated heat supply network water (W2) sequentially passes through the first absorber (A1) and the first condenser (C1) of the high-pressure heat pump, the temperature is further increased to form heat supply network water (W3) meeting the primary heat supply network water index requirement, the first steam (S6) after heat release is condensed to be used as boiler feed water, and the circulating cooling water (L4) discharged by the second evaporator (E2) enters the exhaust gas utilization subsystem to realize circulating work.
8. The series-parallel coupling absorption heat pump system of claim 2, wherein the exhaust utilization subsystem further comprises: the water inlet of the cooling device (5) is connected with the cold source outlet of the condenser, and the water outlet of the cooling device is connected with the cold source inlet of the condenser;
the condenser receives exhaust steam (S3) and utilizes exhaust steam waste heat to heat circulating cooling water (L1) for the first time, the temperature of the circulating cooling water is raised, the circulating cooling water (L2) with the raised temperature is divided into two parts, one part of the circulating cooling water (L3) with the raised temperature is sent to the exhaust smoke utilization subsystem, the other part of the circulating cooling water (L6) with the raised temperature is sent to the cooling device (5), the temperature of the circulating cooling water is lowered after the cooling device (5), the circulating cooling water (L5) with the lowered temperature is mixed with the circulating cooling water (L4) from the low-pressure heat pump, the mixed circulating cooling water (L1) is sent to the condenser, the exhaust steam (S3) becomes condensed water (S8) after the condenser, and the condensed water (S8) is used as boiler feed water.
9. The series-parallel coupling absorption heat pump system of claim 1, wherein lithium bromide and water are used as a working pair for the low pressure heat pump and the high pressure heat pump.
10. The series-parallel coupling absorption heat pump system according to claim 4, wherein the heat recovery heat exchanger (8) is made of a material resistant to sulfuric acid dew point corrosion.
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| CN109443081A (en) * | 2018-12-17 | 2019-03-08 | 国电龙源节能技术有限公司 | A kind of heat pump driving steam condensation water system and its cleaning method |
| CN109443081B (en) * | 2018-12-17 | 2023-09-26 | 国电龙源节能技术有限公司 | Heat pump driven steam condensate system and cleaning method thereof |
| CN109595670A (en) * | 2018-12-20 | 2019-04-09 | 大连民族大学 | The heat pump heat exchanging device of the mixed lithium bromide for dividing concurrent heating of thermoelectricity |
| CN109595667A (en) * | 2018-12-20 | 2019-04-09 | 大连民族大学 | Mixed point of solar energy concurrent heating lithium bromide heat pump heating device |
| CN109855109B (en) * | 2019-03-07 | 2023-09-01 | 华北电力大学 | Deep recovery device and method for exhaust gas waste heat of power station boiler |
| CN109855109A (en) * | 2019-03-07 | 2019-06-07 | 华北电力大学 | A kind of the depth recyclable device and its method of heat of smoke discharged from boiler of power station |
| CN110375458A (en) * | 2019-07-19 | 2019-10-25 | 吉林省威斯特固废处理有限公司 | The recycling system and cracking reduction treatment equipment of high-temperature flue gas |
| CN110553420A (en) * | 2019-09-20 | 2019-12-10 | 安徽普泛能源技术有限公司 | Ammonia absorption type refrigerating system based on lithium bromide unit |
| CN113669956A (en) * | 2021-08-02 | 2021-11-19 | 北京工业大学 | Adjustable generator and control method thereof |
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