CN110243009A - Absorption heat pump heat accumulation and thermal desorption system and its working method for thermal power plant unit - Google Patents

Absorption heat pump heat accumulation and thermal desorption system and its working method for thermal power plant unit Download PDF

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Publication number
CN110243009A
CN110243009A CN201910523447.XA CN201910523447A CN110243009A CN 110243009 A CN110243009 A CN 110243009A CN 201910523447 A CN201910523447 A CN 201910523447A CN 110243009 A CN110243009 A CN 110243009A
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heat
valve
storage medium
solution
water
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CN110243009B (en
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刘继平
邢秦安
种道彤
王进仕
陈伟雄
刘明
严俊杰
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Xian Jiaotong University
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Xian Jiaotong University
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00Details
    • F24D19/10Arrangement or mounting of control or safety devices
    • F24D19/1006Arrangement or mounting of control or safety devices for water heating systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00Hot-water central heating systems
    • F24D3/18Hot-water central heating systems using heat pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00Heat pumps
    • F25B30/04Heat pumps of the sorption type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/006Accumulators

Abstract

The invention discloses a kind of absorption heat pump heat accumulation for thermal power plant unit and thermal desorption system and its working method, which is made of the equipment such as fluid reservoir, solution heat exchanger, evaporator, condenser, absorber, solution cooler, infusion pump, time liquid pump, valve and associated conduit;The system has heat accumulation and two kinds of typical operations of heat release;The characteristic for absorbing when the present invention is changed using heat-storage medium concentration or releasing water vapour realizes the latent heat heat accumulation with water, the range of temperature of heat-storage medium increases, increase accordingly sensible heat quantity of heat storage simultaneously, to increase the quantity of heat storage of unit heat-storage medium, the volume for reducing heat storage can, reduce system investments;The system is run always with the course of work of similar absorption heat pump, can be recycled the exhausted spare heat of steam turbine, can both be increased the heat capacity of unit, can also reduce the gross coal consumption rate of unit, has good heat-economy and Technical Economy.

Description

Absorption heat pump heat accumulation and thermal desorption system and its working method for thermal power plant unit
Technical field
The present invention relates to Thermal power engneering fields, and in particular to a kind of absorption heat pump heat accumulation for thermal power plant unit with Thermal desorption system and its working method.
Background technique
Chinese large-sized Thermal generation unit not only undertakes base load, also carries peak load regulation network task.Due in recent years China's fired power generating unit annual utilization hours maintain always 4000 hours or so, and the thermal power plant unit of northern area is also faced with very big Peak regulation pressure.To solve the problems, such as thermal power plant unit flexibility operation and depth peak regulation, domestic and foreign scholars propose to set in steam power plant The technical solution that heat storage can carries out thermoelectricity decoupling is set, i.e., when unit electric load is higher with the operation of steam extraction operating condition, heat supply steam extraction is not But for heating heat supply network recirculated water, it is also used to heat the heat accumulation working medium in heat storage can;When unit electric load is lower with condensing work Condition operation, utilizes the heat outward supplying heat of heat accumulation working medium in heat storage can.Heat accumulation working medium mostly uses greatly water in current technology scheme, Heat accumulation is realized using the sensible heat of coolant-temperature gage variation.Although the specific heat of water is larger, due to big thermoelecrtic unit heating load very Greatly, need very big heat storage can that can just meet the requirements.By taking certain 300MW thermal power plant unit as an example, design steam extraction amount is 500t/h, is pressed It is 20 DEG C of calculating according to 8 hours quantity of heat storage, water temperature changing value, it has been more than China that the volume of heat storage can, which has reached 12.7 ten thousand steres, The volumetric(al) standards (10 ten thousand stere) of small 2 grades of reservoirs;Since unit does not have heat supply steam extraction, practical heat capacity under heat release operating condition Also decline therewith.
Summary of the invention
In order to solve the above-mentioned problems of the prior art, the purpose of the present invention is to provide a kind of for thermal power plant unit Absorption heat pump heat accumulation and thermal desorption system and its working method absorb or release water when the present invention is changed using heat-storage medium concentration The characteristic of steam realizes the latent heat heat accumulation with water, while the range of temperature of heat-storage medium increases, makes sensible heat quantity of heat storage phase It should increase, to increase the quantity of heat storage of unit heat-storage medium, the volume for reducing heat storage can, reduce system investments;This is System is run always with the course of work of similar absorption heat pump, can be recycled the exhausted spare heat of steam turbine, can both be increased the confession of unit Thermal energy power can also reduce the gross coal consumption rate of unit, have good heat-economy and Technical Economy.
In order to achieve the above object, the present invention adopts the following technical scheme:
A kind of absorption heat pump heat accumulation and thermal desorption system for thermal power plant unit, including fluid reservoir 1, the heat accumulation of fluid reservoir 1 Media outlet end is connected with the input end of infusion pump 7;The outlet end of the heat-storage medium input end of fluid reservoir 1 and the second valve 10 And the 8th the outlet end of valve 16 be connected;The input end of the outlet end of infusion pump 7 and the first valve 9 and the 7th valve 15 into Mouth end is connected;The outlet end phase of the outlet end of first valve 9 and the heat absorbing side input end of solution heat exchanger 2 and the 5th valve 13 Connection;The heat absorbing side outlet end of solution heat exchanger 2 is connected with the heat absorbing side input end of evaporator 3;The heat release of solution heat exchanger 2 Side-entrance end is connected with the outlet end of third valve 11;The cold side outlet end of solution heat exchanger 2 and the 4th valve 12 into Mouth end is connected;The heat absorbing side taphole end of evaporator 3 and the input end of the second valve 10 and the input end of third valve 11 It is connected;The heat absorbing side steam outlet end of evaporator 3 is connected with the cold side input end of condenser 4;The heat release of evaporator 3 Side-entrance end is connected with heat supply steam extraction 19;The cold side outlet end of evaporator 3 is connected with hydrophobic the 20 of heat supply steam extraction;Condensation The cold side outlet end of device 4 is connected with hydrophobic the 18 of water vapour;The heat absorbing side input end of condenser 4 is connected with heat supply network return water 17 It is logical;The heat absorbing side input end of absorber 5 is connected with the heat absorbing side outlet end of condenser 4, the cold side input end of absorber 5 with Low-pressure steam 21, the 4th valve 12 outlet end be connected with the outlet end of the 6th valve 14, the cold side outlet end of absorber 5 It is connected with 8 input end of liquid pump is returned;The heat absorbing side input end of solution cooler 6 is connected with the heat absorbing side outlet end of absorber 5; The heat absorbing side outlet end of solution cooler 6 is the heat supply network water outlet 22 of outward supplying heat;The cold side input end of solution cooler 6 and The outlet end of seven valves 15 is connected, the cold side outlet end of solution cooler 6 is connected with the input end of the 6th valve 14;It returns 8 outlet end of liquid pump is connected with the input end of the input end of the 5th valve 13 and the 8th valve 16;It is described a kind of for heat supply machine Heat-storage medium used in the absorption heat pump heat accumulation and thermal desorption system of group is lithium bromide, lithium chloride, sodium hydroxide, calcium chloride, nitre The aqueous solution of a kind of aqueous solution of substance or many kinds of substance in sour potassium, sodium nitrate;The solution heat exchanger 2, evaporator 3, condensation Device 4, absorber 5 and solution cooler are dividing wall type heat exchanger.
Working medium is heat-storage medium in the fluid reservoir 1;The heat exchange two sides working medium of solution heat exchanger 2 is that the heat accumulation of different temperatures is situated between Matter;3 cold side working medium of evaporator is hydrophobic the 20 of the heat supply steam extraction that heat supply steam extraction 19 and the condensation of heat supply steam extraction 19 are formed, evaporator 3 heat absorbing side working medium are heat-storage medium and the water vapour that heat-storage medium evaporation generates;4 cold side working medium of condenser is that heat-storage medium exists Hydrophobic the 18 of the water vapour that the water vapour and the water recovery that generation is evaporated in evaporator 3 are formed, 4 heat absorbing side working medium of condenser For heat supply network return water 17;The heat absorbing side working medium of absorber 5 is heat supply network return water 17, and 5 cold side working medium of absorber is heat-storage medium and low Press steam 21;6 cold side working medium of solution cooler is heat-storage medium, 6 heat absorbing side working medium of solution cooler is heat supply network water outlet 22.
It is described a kind of for the absorption heat pump heat accumulation of thermal power plant unit and the working method of thermal desorption system, including heat accumulation work Make process and the heat release course of work;
The heat accumulation course of work are as follows: thermal power plant unit electric load it is higher, run on supplying thermal condition when, a kind of use It is run in the absorption heat pump heat accumulation and thermal desorption system of thermal power plant unit according to the heat accumulation course of work;Put into operation infusion pump 7 and time liquid pump 8 The power of flowing is provided to heat-storage medium, opens the first valve 9, the second valve 10, third valve 11, the 4th valve 12 and the 5th Valve 13 closes the 6th valve 14, the 7th valve 15 and the 8th valve 16 to limit the flow direction of heat-storage medium, so that heat accumulation be made to be situated between Matter forms following process and state change: passing through infusion pump 7 and the first valve from the low temperature dilute concentration heat-storage medium of heat storage can 1 9 enter solution heat exchanger 2, enter evaporator 3 after being heated in solution heat exchanger 2 by the heat-storage medium for flowing through third valve 11, Water vapour and high-temperature high concentration heat-storage medium, the water that evaporator 3 generates are generated after being heated in evaporator 3 by heat supply steam extraction 19 again Steam flows into condenser 4 and simultaneously heats heat supply network return water 17, and 3 high temperature high concentration heat-storage medium of evaporator is divided into two-way, all the way through the Two valves 10 return heat storage can 1, another way followed by after third valve 11, solution heat exchanger 2, the 4th valve 12 enter absorb Device 5;Heat-storage medium into absorber 5 absorbs low-pressure steam 21 and successively flows after heating the heat supply network return water 17 of the outflow of condenser 4 Enter solution heat exchanger 2 after time liquid pump 8, the 5th valve 13 become low temperature dilute concentration heat-storage medium;Heat supply network return water 17 successively flows It is heated through condenser 4, absorber 5 and solution cooler 6 and in condenser 4, absorber 5;In the process, heat accumulation is flowed out The state of the heat-storage medium of tank 1 is low temperature dilute concentration, and the state into the heat-storage medium of heat storage can 1 is high-temperature high concentration;It flows into The state of the heat supply network return water 17 of condenser 4 is low temperature, and the state of the heat supply network water outlet 22 of outflow solution cooler 6 is high temperature;It is i.e. logical Crossing the heat accumulation course of work makes heat-storage medium and heat supply network recycle the preset variation of water state generation, realizes heat accumulation, outward supplying heat effect;
The heat release course of work are as follows: thermal power plant unit electric load it is lower, run on condensing operating condition when, a kind of use It is run in the absorption heat pump heat accumulation and thermal desorption system of thermal power plant unit according to the heat release course of work;Put into operation infusion pump 7 and time liquid pump 8 The power of flowing is provided to heat-storage medium, closes the first valve 9, the second valve 10, the 4th valve 12 and the 5th valve 13, is opened 6th valve 14, the 7th valve 15 and the 8th valve 16 are to limit the flow direction of heat-storage medium, so that it is as follows to form heat-storage medium Process and state change: enter solution by infusion pump 7 and the 7th valve 15 from 1 high temperature high concentration heat-storage medium of heat storage can Cooler 6, heat-storage medium heated in solution cooler 6 followed by condenser 4, absorber 5, solution cooler 6 heat supply network Enter absorber 5 through the 6th valve 14 after return water 17, the heat-storage medium into absorber 5 absorbs low-pressure steam 21 and heats condensation Become low temperature dilute concentration heat-storage medium after the heat supply network return water 17 that device 4 flows out and enters liquid storage followed by time liquid pump 8, the 8th valve 16 Tank 1;Heat supply network return water 17 is followed by condenser 4, absorber 5 and solution cooler 6 and in absorber 5 and solution cooler 6 It is heated;In the process, the state for flowing out the heat-storage medium of heat storage can 1 is high-temperature high concentration, and the heat accumulation into heat storage can 1 is situated between The state of matter is low temperature dilute concentration;The state for flowing into the heat supply network return water 17 of condenser 4 is low temperature, the heat for flowing out solution cooler 6 The state of net water outlet 22 is high temperature, i.e., so that heat-storage medium and heat supply network is recycled water state by the heat release course of work and preset change occurs Change, to realize outward supplying heat effect.
Heat supply steam extraction 19 into evaporator 3 is condensed into hydrophobic the 20 of heat supply steam extraction after heating heat-storage medium and returns to heat Force system.
The water vapour that evaporator 3 generates heats hydrophobic the 18 of the water vapour generated after heat supply network return water 17 in condenser 4 and draws Enter drain tank, after processing as the supplement water of thermal power plant unit, or is produced with the exhausted spare heat heating evaporation device 3 of turbine low pressure cylinder Raw water vapour is to supply absorber 5.
The steam discharge of turbine low pressure cylinder is directlyed adopt into the low-pressure steam 21 of absorber 5, or by exhausted spare heat by following Ring water is generated in a manner of indirect heating.
Compared to the prior art, the invention has the following advantages that
1, with conventional using water compared with heat-storage medium, the present invention is using the sensible heat of solution and the latent heat of water vapour come real Existing heat accumulation, 5 times higher than conventional pure water of the quantity of heat storage of unit heat accumulation tank volume or more.
It is molten since the saturation temperature of solution under uniform pressure is more much higher than pure water in terms of solution sensible heat heat accumulation The maximum operating temperature of liquid can reach 120 DEG C or more, and heat storage can still work in normal pressure, and the heat storage can of pure water is used to work Its temperature need to be lower than 100 DEG C under normal pressure, to increase the range of temperature of heat-storage medium, increase sensible heat quantity of heat storage.
In terms of latent heat heat accumulation, by taking lithium-bromide solution as an example, concentration 50% or so lithium-bromide solution density with it is pure Relatively, when its concentration variation range is 10%, 1kg solution can absorb the low-pressure steam of 0.2kg to water, and quantity of heat storage is about 500kJ/kg is about as much as the sensible heat quantity of heat storage that pure water temperature changes 120 DEG C.
From the above analysis as can be seen that heat reservoir of the invention, the quantity of heat storage of unit heat accumulation tank volume are higher than pure water by 5 Times or more.
2, compared with conventional using water as heat-storage medium, the heat capacity of heat reservoir of the invention is bigger.
16 hours, condensing operating condition operation calculating in 8 hours are run with the daily supplying thermal condition of thermal power plant unit, uses pure water for heat accumulation Medium, there are heat supply steam extraction, heat capacity decline 1/3 in only 2/3 time daily;And heat reservoir of the invention is used, by It can achieve 1.7 in the COP of absorption heat pump, unit its heat capacity maximum under the same course of work can reach former design 1.13 times of operating condition, heat capacity is bigger.
3, the heat-economy of thermal power plant unit is improved.
Heat reservoir proposed by the present invention is substantially an absorption heat pump, which recycles the row of turbine low pressure cylinder Vapour waste heat outward supplying heat can increase substantially the operation heat-economy of unit, reduce fuel consumption, reduce pollutant emission, from And realize the energy-saving and emission-reduction of thermal power plant unit.
It invention can be widely used in the flexibility operation and the transformation of depth peak regulation of Chinese large-sized thermal power plant unit, to realize thermoelectricity Decoupling.
Detailed description of the invention
Fig. 1 is absorption heat pump heat accumulation and thermal desorption system schematic diagram of the present invention for thermal power plant unit.
In figure: 1-fluid reservoir 2-solution heat exchanger, 3-evaporator, 4-condenser, 5-absorber, 6-solution is cold But 7-infusion pump of device 8-returns the 12-the four valve of the 9-the first valve of liquid pump 11-third of the 10-the second valve valve 13-the five valve the 14-the six valve the 15-the seven valve the 16-the eight valve 17-heat supply network, 18-water vapour of return water 22-heat supply network of hydrophobic 21-low-pressure steam of hydrophobic 19-heat supply steam extraction, 20-heat supply steam extraction is discharged.
Specific embodiment
The present invention is described in further details with reference to the accompanying drawings and detailed description.
It is the main technological route that thermal power plant unit realizes flexibility operation and depth peak regulation in steam power plant's setting heat reservoir One of.To reduce cost, heat-storage medium used in heat reservoir is suitble to cheap using water, rock, soil and waste metal etc. Heat accumulating, wherein the heat exchange property of water is relatively best, and specific heat at constant pressure is also larger, and existing steam power plant's heat accumulation scheme often selects water As heat-storage medium.But the heating load of modern big thermoelecrtic unit is huge, causes heat storage can is bulky, increases system to throw Money, and thermal power plant unit is run with condensing operating condition, does not have heat supply steam extraction under low electric load, practical heat capacity is also under Drop.
The thermophysical property discovery of water is analyzed, the specific heat at constant pressure of water is 4.2kJ/ (kg DEG C), as water temperature becomes in heat reservoir Change amplitude is 20 DEG C, then its quantity of heat storage is 84kJ/kg;And the latent heat of vaporization of water is about 2500kJ/kg, as can utilizing the vapour-liquid of water Latent heat of phase change carries out heat accumulation, then its quantity of heat storage reaches 2500kJ/kg, is 30 times of sensible heat quantity of heat storage or so.But water vapour is close Spending very little, (the saturated vapor density of 0.4MPa is 2.16kg/m3), the quantity of heat storage of unit volume is 5400kJ/m3.Therefore, such as It is heat-storage medium that heat reservoir, which directlys adopt water vapour, and when quantity of heat storage is identical, heat accumulation tank volume will be bigger.
In thermal power plant unit operation, whether in supplying thermal condition or condensing operating condition, turbine low pressure cylinder, which is discharged, to be contained There is the steam exhaust of a large amount of low temperature exhaust heats.Using the technology of lithium bromide absorption type heat pump recycling steam turbine exhaust heat in China's thermoelectricity Industry is widely used, its working principle is that being heated, being released by lithium-bromide solution first with heat supply steam extraction Then the higher water vapour of pressure is cooled down lithium-bromide solution, the lower water vapour of absorption pressure.If bromine under a certain concentration The saturation evaporating temperature for changing lithium aqueous solution is 50 DEG C higher than the pure water under same pressure, then can will be saturated by lithium bromide absorption process The latent heat for the water vapour that temperature is 35 DEG C is converted to the sensible heat of 85 DEG C of solution and exports outward.
The present invention passes through storage high-temperature high concentration heat-storage medium and utilizes heat supply machine according to the working principle of absorption heat pump The exhausted spare heat of group constructs the latent heat of vaporization using water vapour, the system that the sensible heat of solution temperature variation realizes heat accumulation, work Make principle as shown in Figure 1, the system has two kinds of typical operations of heat accumulation and heat release.
As shown in Figure 1, a kind of absorption heat pump heat accumulation and thermal desorption system for thermal power plant unit of the present invention, including fluid reservoir 1, the heat-storage medium outlet end of fluid reservoir 1 is connected with the input end of infusion pump 7;The heat-storage medium input end of fluid reservoir 1 and The outlet end of two valves 10 and the outlet end of the 8th valve 16 are connected;The input end of the outlet end of infusion pump 7 and the first valve 9 And the 7th the input end of valve 15 be connected;The outlet end of first valve 9 and the heat absorbing side input end and the 5th of solution heat exchanger 2 The outlet end of valve 13 is connected;The heat absorbing side outlet end of solution heat exchanger 2 is connected with the heat absorbing side input end of evaporator 3; The cold side input end of solution heat exchanger 2 is connected with the outlet end of third valve 11;The cold side outlet end of solution heat exchanger 2 It is connected with the input end of the 4th valve 12;The input end of the heat absorbing side taphole end of evaporator 3 and the second valve 10 and the The input end of three valves 11 is connected;The heat absorbing side steam outlet end of evaporator 3 is connected with the cold side input end of condenser 4 It is logical;The cold side input end of evaporator 3 is connected with heat supply steam extraction 19;The cold side outlet end of evaporator 3 and heat supply steam extraction Hydrophobic 20 are connected;The cold side outlet end of condenser 4 is connected with hydrophobic the 18 of water vapour;The heat absorption side-entrance of condenser 4 End is connected with heat supply network return water 17;The heat absorbing side input end of absorber 5 is connected with the heat absorbing side outlet end of condenser 4, absorbs The cold side input end of device 5 is connected with the outlet end of low-pressure steam 21, the outlet end of the 4th valve 12 and the 6th valve 14, inhales The heat absorbing side outlet end for receiving device 5 is connected with 8 input end of liquid pump is returned;The heat absorbing side input end of solution cooler 6 and absorber 5 Heat absorbing side outlet end is connected;The heat absorbing side outlet end of solution cooler 6 is the heat supply network water outlet 22 of outward supplying heat;Solution cooler 6 cold side input end is connected with the outlet end of the 7th valve 15, the cold side outlet end of solution cooler 6 and the 6th valve 14 input end is connected;8 outlet end of liquid pump is gone back to be connected with the input end of the input end of the 5th valve 13 and the 8th valve 16. Heat-storage medium used in a kind of absorption heat pump heat accumulation for thermal power plant unit and thermal desorption system be lithium bromide, lithium chloride, Sodium hydroxide, calcium chloride, potassium nitrate, the aqueous solution of a kind of aqueous solution of substance or many kinds of substance in sodium nitrate;The solution changes Hot device 2, evaporator 3, condenser 4, absorber 5 and solution cooler are dividing wall type heat exchanger.
Since lithium bromide price is more expensive, for the investment for reducing system, it is molten that lithium bromide had both can be used in the heat-storage medium of Fig. 1 system A kind of the water-soluble of substance in the substances such as calcium chloride, lithium chloride, sodium hydroxide, calcium chloride, potassium nitrate and sodium nitrate can also be used in liquid The aqueous solution of liquid or many kinds of substance.
Heat storage can 1 is the container for accommodating heat-storage medium;The heat exchange of the solution heat exchanger 2 two sides working medium is the storage of different temperatures Thermal medium;3 cold side working medium of evaporator is hydrophobic the 20 of the heat supply steam extraction that heat supply steam extraction 19 and the condensation of heat supply steam extraction 19 are formed, is steamed Send out the water vapour that 3 heat absorbing side working medium of device is heat-storage medium and heat-storage medium evaporation generates;4 cold side working medium of condenser is heat accumulation Jie Hydrophobic the 18 of the water vapour that matter evaporates the water vapour of generation in evaporator 3 and the water recovery is formed, 4 heat absorbing side of condenser Working medium is heat supply network return water 17;The heat absorbing side working medium of absorber 5 is heat supply network return water 17, and the cold side working medium of absorber 5 is heat accumulation Jie Matter and low-pressure steam 21;6 cold side working medium of solution cooler is heat-storage medium, 6 heat absorbing side working medium of solution cooler is that heat supply network goes out Water 22.
Heat supply network return water 17, heat supply network water outlet 22 are heat supply network recirculated water, heat supply network return water 17 in condenser 4 and absorber 5 by Heat forms heat supply network water outlet 22 after being heated in absorber 5 and solution cooler 6.
The present invention is worked for the absorption heat pump heat accumulation of thermal power plant unit and the working method of thermal desorption system, including heat accumulation Journey and the heat release course of work;
The heat accumulation course of work are as follows: thermal power plant unit electric load it is higher, run on supplying thermal condition when, a kind of use It is run in the absorption heat pump heat accumulation and thermal desorption system of thermal power plant unit according to the heat accumulation course of work;Put into operation infusion pump 7 and time liquid pump 8 The power of flowing is provided to heat-storage medium, opens the first valve 9, the second valve 10, third valve 11, the 4th valve 12 and the 5th Valve 13 closes the 6th valve 14, the 7th valve 15 and the 8th valve 16 to limit the flow direction of heat-storage medium, so that heat accumulation be made to be situated between Matter forms following process and state change: passing through infusion pump 7 and the first valve from the low temperature dilute concentration heat-storage medium of heat storage can 1 9 enter solution heat exchanger 2, enter evaporator 3 after being heated in solution heat exchanger 2 by the heat-storage medium for flowing through third valve 11, Water vapour and high-temperature high concentration heat-storage medium, the water that evaporator 3 generates are generated after being heated in evaporator 3 by heat supply steam extraction 19 again Steam flows into condenser 4 and simultaneously heats heat supply network return water 17, and 3 high temperature high concentration heat-storage medium of evaporator is divided into two-way, all the way through the Two valves 10 return heat storage can 1, another way followed by after third valve 11, solution heat exchanger 2, the 4th valve 12 enter absorb Device 5;Heat-storage medium into absorber 5 absorbs low-pressure steam 21 and successively flows after heating the heat supply network return water 17 of the outflow of condenser 4 Enter solution heat exchanger 2 after time liquid pump 8, the 5th valve 13 become low temperature dilute concentration heat-storage medium;Heat supply network return water 17 successively flows It is heated through condenser 4, absorber 5 and solution cooler 6 and in condenser 4, absorber 5;In the process, heat accumulation is flowed out The state of the heat-storage medium of tank 1 is low temperature dilute concentration, and the state into the heat-storage medium of heat storage can 1 is high-temperature high concentration;It flows into The state of the heat supply network return water 17 of condenser 4 is low temperature, and the state of the heat supply network water outlet 22 of outflow solution cooler 6 is high temperature;It is i.e. logical Crossing the heat accumulation course of work makes heat-storage medium and heat supply network recycle the preset variation of water state generation, realizes heat accumulation, outward supplying heat effect;
The heat release course of work are as follows: thermal power plant unit electric load it is lower, run on condensing operating condition when, a kind of use It is run in the absorption heat pump heat accumulation and thermal desorption system of thermal power plant unit according to the heat release course of work;Put into operation infusion pump 7 and time liquid pump 8 The power of flowing is provided to heat-storage medium, closes the first valve 9, the second valve 10, the 4th valve 12 and the 5th valve 13, is opened 6th valve 14, the 7th valve 15 and the 8th valve 16 are to limit the flow direction of heat-storage medium, so that it is as follows to form heat-storage medium Process and state change: enter solution by infusion pump 7 and the 7th valve 15 from 1 high temperature high concentration heat-storage medium of heat storage can Cooler 6, heat-storage medium heated in solution cooler 6 followed by condenser 4, absorber 5, solution cooler 6 heat supply network Enter absorber 5 through the 6th valve 14 after return water 17, the heat-storage medium into absorber 5 absorbs low-pressure steam 21 and heats condensation Become low temperature dilute concentration heat-storage medium after the heat supply network return water 17 that device 4 flows out and enters liquid storage followed by time liquid pump 8, the 8th valve 16 Tank 1;Heat supply network return water 17 is followed by condenser 4, absorber 5 and solution cooler 6 and in absorber 5 and solution cooler 6 It is heated;In the process, the state for flowing out the heat-storage medium of heat storage can 1 is high-temperature high concentration, and the heat accumulation into heat storage can 1 is situated between The state of matter is low temperature dilute concentration;The state for flowing into the heat supply network return water 17 of condenser 4 is low temperature, the heat for flowing out solution cooler 6 The state of net water outlet 22 is high temperature, i.e., so that heat-storage medium and heat supply network is recycled water state by the heat release course of work and preset change occurs Change, to realize outward supplying heat effect.
As the preferred embodiment of the present invention, the heat supply steam extraction 19 into evaporator 3 condenses after heating heat-storage medium For heat supply steam extraction hydrophobic 20 and return to therrmodynamic system.
As the preferred embodiment of the present invention, the water vapour that evaporator 3 generates heats heat supply network return water 17 in condenser 4 Hydrophobic the 18 of the water vapour generated afterwards introduce drain tank, after processing as the supplement water of thermal power plant unit, or use steam turbine low-pressure The water vapour that the exhausted spare heat heating evaporation device 3 of cylinder generates is to supply absorber 5.
As the preferred embodiment of the present invention, the low-pressure steam 21 into absorber 5 directlys adopt turbine low pressure cylinder Steam discharge, or generated in a manner of indirect heating by exhausted spare heat recirculated water.

Claims (6)

1. a kind of absorption heat pump heat accumulation and thermal desorption system for thermal power plant unit, it is characterised in that: including fluid reservoir (1), storage The heat-storage medium outlet end of flow container (1) is connected with the input end of infusion pump (7);The heat-storage medium input end of fluid reservoir (1) with The outlet end of second valve (10) and the outlet end of the 8th valve (16) are connected;The outlet end of infusion pump (7) and the first valve (9) input end of input end and the 7th valve (15) is connected;The outlet end of first valve (9) and solution heat exchanger (2) The outlet end of heat absorbing side input end and the 5th valve (13) is connected;The heat absorbing side outlet end of solution heat exchanger (2) and evaporator (3) heat absorbing side input end is connected;The cold side input end of solution heat exchanger (2) is connected with the outlet end of third valve (11) It is logical;The cold side outlet end of solution heat exchanger (2) is connected with the input end of the 4th valve (12);The heat absorbing side of evaporator (3) Taphole end is connected with the input end of the input end of the second valve (10) and third valve (11);The heat absorption of evaporator (3) Side steam outlet end is connected with the cold side input end of condenser (4);The cold side input end of evaporator (3) and heat supply are taken out Vapour (19) is connected;The cold side outlet end of evaporator (3) is connected with hydrophobic (20) of heat supply steam extraction;Condenser (4) are put Hot side outlet end is connected with hydrophobic (18) of water vapour;The heat absorbing side input end of condenser (4) is connected with heat supply network return water (17) It is logical;The heat absorbing side input end of absorber (5) is connected with the heat absorbing side outlet end of condenser (4), the cold side of absorber (5) into Mouth end is connected with the outlet end of low-pressure steam (21), the outlet end of the 4th valve (12) and the 6th valve (14), absorber (5) Cold side outlet end with return liquid pump (8) input end be connected;The heat absorbing side input end of solution cooler (6) and absorber (5) Heat absorbing side outlet end be connected;The heat absorbing side outlet end of solution cooler (6) is that the heat supply network of outward supplying heat is discharged (22);Solution The cold side input end of cooler (6) is connected with the outlet end of the 7th valve (15), the heat release side outlet of solution cooler (6) End is connected with the input end of the 6th valve (14);Return the input end and the 8th valve of liquid pump (8) outlet end and the 5th valve (13) The input end of door (16) is connected;Storage used in a kind of absorption heat pump heat accumulation for thermal power plant unit and thermal desorption system Thermal medium is lithium bromide, lithium chloride, sodium hydroxide, calcium chloride, potassium nitrate, a kind of aqueous solution or a variety of objects of substance in sodium nitrate The aqueous solution of matter;The solution heat exchanger (2), evaporator (3), condenser (4), absorber (5) and solution cooler (6) are Dividing wall type heat exchanger.
2. a kind of absorption heat pump heat accumulation and thermal desorption system for thermal power plant unit, feature according to claim exist In: working medium is heat-storage medium in the fluid reservoir (1);Solution heat exchanger (2) heat exchange two sides working medium is that the heat accumulation of different temperatures is situated between Matter;Evaporator (3) cold side working medium is heat supply steam extraction (19) and heat supply steam extraction (19) condenses the hydrophobic of the heat supply steam extraction formed (20), evaporator (3) heat absorbing side working medium is heat-storage medium and the water vapour that heat-storage medium evaporation generates;Condenser (4) cold side Working medium is the hydrophobic of the water vapour of the heat-storage medium water vapour that evaporation generates in evaporator (3) and water recovery formation (18), condenser (4) heat absorbing side working medium is heat supply network return water (17);The heat absorbing side working medium of absorber (5) is heat supply network return water (17), is inhaled The cold side working medium for receiving device (5) is heat-storage medium and low-pressure steam (21);Solution cooler (6) cold side working medium is heat accumulation Jie Matter, solution cooler (6) heat absorbing side working medium are that heat supply network is discharged (22).
3. it is of any of claims 1 or 2 a kind of for the absorption heat pump heat accumulation of thermal power plant unit and the working method of thermal desorption system, It is characterized by comprising the heat accumulation courses of work and the heat release course of work;
The heat accumulation course of work are as follows: thermal power plant unit electric load it is higher, run on supplying thermal condition when, described one kind is for supplying The absorption heat pump heat accumulation and thermal desorption system of heat engine group are run according to the heat accumulation course of work;It puts into operation infusion pump (7) and goes back to liquid pump (8) The power of flowing is provided to heat-storage medium, opens the first valve (9), the second valve (10), third valve (11), the 4th valve (12) and the 5th valve (13) the 6th valve (14), the 7th valve (15) and the 8th valve (16) are closed, to limit heat-storage medium Flow direction, so that heat-storage medium be made to form following process and state change: from heat storage can (1) come low temperature dilute concentration heat-storage medium Enter solution heat exchanger (2) by infusion pump (7) and the first valve (9), is flowed through third valve in solution heat exchanger (2) (11) enter evaporator (3) after heat-storage medium heating, then generate water after by heat supply steam extraction (19) heating in evaporator (3) and steam Vapour and high-temperature high concentration heat-storage medium, the water vapour that evaporator (3) generates flow into condenser (4) and heat heat supply network return water (17), Evaporator (3) high temperature high concentration heat-storage medium is divided into two-way, returns to heat storage can (1) through the second valve (10) all the way, another way Enter absorber (5) afterwards followed by third valve (11), solution heat exchanger (2), the 4th valve (12);Into absorber (5) Heat-storage medium absorb low-pressure steam (21) and heat condenser (4) outflow heat supply network return water (17) after followed by return liquid pump (8), the 5th valve (13) enters solution heat exchanger (2) after becoming low temperature dilute concentration heat-storage medium;Heat supply network return water (17) successively flows It is heated in (5) through condenser (4), absorber (5) and solution cooler (6) and in condenser (4), absorber;In this process In, the state for flowing out the heat-storage medium of heat storage can (1) is low temperature dilute concentration, and the state into the heat-storage medium of heat storage can (1) is High-temperature high concentration;The state for flowing into the heat supply network return water (17) of condenser (4) is low temperature, and the heat supply network of outflow solution cooler (6) goes out The state of water (22) is high temperature;So that heat-storage medium and heat supply network is recycled water state by the heat accumulation course of work and preset change occurs Change, realizes heat accumulation, outward supplying heat effect;
The heat release course of work are as follows: thermal power plant unit electric load it is lower, run on condensing operating condition when, described one kind is for supplying The absorption heat pump heat accumulation and thermal desorption system of heat engine group are run according to the heat release course of work;It puts into operation infusion pump (7) and goes back to liquid pump (8) The power of flowing is provided to heat-storage medium, closes the first valve (9), the second valve (10), the 4th valve (12) and the 5th valve (13), the 6th valve (14), the 7th valve (15) and the 8th valve (16) are opened to limit the flow direction of heat-storage medium, to make to store up Thermal medium forms following process and state change: from heat storage can (1) high temperature high concentration heat-storage medium by infusion pump (7) with 7th valve (15) enters solution cooler (6), heat-storage medium in the solution cooler (6) heating followed by condenser (4), Absorber (5), solution cooler (6) heat supply network return water (17) by the 6th valve (14) enter absorber (5), into absorber (5) heat-storage medium absorbs low-pressure steam (21) and heats that become low temperature after the heat supply network return water (17) of condenser (4) outflow dilute dense It spends heat-storage medium and enters fluid reservoir (1) followed by time liquid pump (8), the 8th valve (16);Heat supply network return water (17) is followed by cold Condenser (4), absorber (5) and solution cooler (6) are simultaneously heated in absorber (5) and solution cooler (6);In this process In, the state for flowing out the heat-storage medium of heat storage can (1) is high-temperature high concentration, and the state into the heat-storage medium of heat storage can (1) is Low temperature dilute concentration;The state for the heat supply network return water (17) for flowing into condenser (4) is low temperature, the heat supply network of outflow solution cooler (6) goes out The state of water (22) is high temperature, i.e., so that heat-storage medium and heat supply network is recycled water state by the heat release course of work and preset change occurs Change, to realize outward supplying heat effect.
4. working method according to claim 3, it is characterised in that: the heat supply steam extraction (19) for entering evaporator (3) is adding It is condensed into hydrophobic (20) of heat supply steam extraction after hot heat-storage medium and returns to therrmodynamic system.
5. working method according to claim 3, it is characterised in that: the water vapour that evaporator (3) generates is in condenser (4) Hydrophobic (18) for the water vapour that middle heating heat supply network return water (17) generates afterwards introduce drain tank, after processing as the benefit of thermal power plant unit Water-filling, or the water vapour generated with the exhausted spare heat heating evaporation device (3) of turbine low pressure cylinder is to supply absorber (5).
6. working method according to claim 3, it is characterised in that: the low-pressure steam (21) for entering absorber (5) is direct It is generated in a manner of indirect heating using the steam discharge of turbine low pressure cylinder, or by exhausted spare heat recirculated water.
CN201910523447.XA 2019-06-17 2019-06-17 Absorption heat pump heat storage and release system for heat supply unit and working method thereof Active CN110243009B (en)

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