CN107091542A - A kind of coupling circulation system and control method for solar energy thermal-power-generating - Google Patents

A kind of coupling circulation system and control method for solar energy thermal-power-generating Download PDF

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Publication number
CN107091542A
CN107091542A CN201710269813.4A CN201710269813A CN107091542A CN 107091542 A CN107091542 A CN 107091542A CN 201710269813 A CN201710269813 A CN 201710269813A CN 107091542 A CN107091542 A CN 107091542A
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temperature
heat
forecooler
entrance
main compressor
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CN107091542B (en
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马岳庚
张鑫
杨晶莹
刘明
刘继平
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Xian Jiaotong University
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Xian Jiaotong University
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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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon dioxide
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
    • Y02A40/963—Off-grid food refrigeration
    • 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

Abstract

A kind of coupling circulation system and control method for solar energy thermal-power-generating, the system includes the supercritical carbon dioxide Brayton cycle subsystem and Lithium Bromide Absorption Refrigeration Cycle subsystem coupled with evaporator by generator, and main compressor inlet temperature control system；The invention also discloses the control method of the system；By by supercritical CO2A part of heat is converted to cold by Lithium Bromide Absorption Refrigeration Cycle and is used in the waste heat that Brayton cycle discharges into cooler originally, to reduce main compressor inlet temperature, so as to reduce the irreversible loss of the total available energy of coupling circulation system, the thermal efficiency and efficiency of the circulatory system are improved；And pass through the control of main compressor inlet temperature, it is ensured that efficient stable operation of the coupled electricity-generation system under different temperature conditions.

Description

A kind of coupling circulation system and control method for solar energy thermal-power-generating
Technical field
The present invention relates to a kind of circulation system, and in particular to a kind of coupling circulation system for solar energy thermal-power-generating And control method.
Background technology
Solar power generation is as a kind of new energy conversion technology because with low-carbon environment-friendly, inexhaustible Advantage is considered as the energy utilization type of great prospect.Wherein, solar light-heat power-generation is due to power generation continuous property and stably Property, the energy-saving, advantage such as reduce investment outlay and the energy conversion technology for being considered as a kind of great potential, and will be in China or even generation Consequence is occupied in boundary's future source of energy industrial expansion.On the other hand, supercritical carbon dioxide (S-CO2) Brayton cycle Possess the very high thermal efficiency under the conditions of 450-650 DEG C or so of turbine initial temperature, and it is excellent to have compact conformation, small volume etc. concurrently Gesture, thus it is considered as a kind of energy conversion system of great prospect of solar energy thermal-power-generating.Research was by various configurations in the past S-CO2The thermodynamics comparing calculation of Brayton cycle shows：Recompression circulation is a kind of ideal system configuration mode, Have cycle efficieny height and the succinct advantage of configuration concurrently.It is such a to cycle through introducing recompression machine, main compressor is flowed through to script A part of working medium is shunted, so as to solve " folder point " problem of cryogenic regenerator, improves regenerator heat absorption side outlet temperature Degree, so as to be obviously improved cycle efficieny.
However, because the higher area of many solar energy resources density is located at low latitudes desert region, drought is hot. Thus, for large-sized solar photo-thermal unit, the heat absorption working medium of cooler at circulation low-temperature receiver and unreal is used as using cooling water Border, typically can carry out the cooling of cycle fluid using air cooling mode as low-temperature receiver heat absorption working medium.However, due to air heat-exchange energy Power is weaker, thus the air-CO at low-temperature receiver2The design end difference of heat exchanger is than water-CO2The heat exchanger designs end high 10-15 of difference DEG C, along with the air themperature of hot area's cooler is higher, cause S-CO2Brayton cycle CO2Working medium cold junction temperature is far above CO2Critical point temperature.And due to S-CO2One of higher key reason of Brayton cycle efficiency is exactly that circulation cold end enters The Temperature of Working of compressor declines the compressibility factor of working medium in compressor close to critical-temperature, and compressor wasted work substantially drops It is low.Obvious negative effect thus will be produced to cycle efficieny using air cooling mode, especially circulated when summer temperature is higher The decline of efficiency will become apparent from, and consider further that to summer be solar energy resources abundant time and subfam. Spiraeoideae peak period, circulation The obvious reduction of efficiency will produce the reduction being particularly acute to total output electric energy of solar light-heat power-generation, and electrical energy demands are also by difficulty To meet.
The content of the invention
To solve the problems of above-mentioned prior art, the present invention provides a kind of coupling for solar energy thermal-power-generating and followed Loop system and control method, in S-CO2Brayton cycle bottom couples Lithium Bromide Absorption Refrigeration Cycle, is circulated using S-CO2 Cryogenic regenerator heat release side outlet enters the CO directly cooled down at low-temperature receiver originally2Working medium waste heat is used as lithium bromide absorbing type refrigeration Driving heat source, the cold of generation is used for the main compressor inlet temperature for maintaining S-CO2 to circulate cold end near critical point temperature, from And can remain that compressor wasted work is relatively low, maintain the cycle efficieny and output work level of higher level；To adapt to environment temperature Change the influence brought to cycle efficieny and output work, compressor inlet temperature control method of the present invention, it is ensured that system is in difference Steady Effec-tive Function under ambient temperature conditions.
To reach above-mentioned purpose, the concrete technical scheme that the present invention is used for：
A kind of coupling circulation system for solar energy thermal-power-generating, including pass through surpassing that generator 8 is coupled with evaporator 16 Critical carbon dioxide Brayton cycle subsystem and Lithium Bromide Absorption Refrigeration Cycle subsystem, and main compressor inlet temperature Control system；
The supercritical carbon dioxide Brayton cycle subsystem loop includes circulation turbine 2, the outlet connection of circulation turbine 2 The heat release side entrance of high temperature regenerator 3, the heat release side outlet of high temperature regenerator 3 connects the heat release side entrance of cryogenic regenerator 4, and low temperature is returned The heat release side outlet of hot device 4 is divided into two-way：The entrance of first via connection recompression machine 5；The second tunnel connection heat source side of generator 8 enters Mouthful, the outlet of generator heat source side 8 connection forecooler 6 heat release side entrance, the heat release side outlet of forecooler 6 is divided into Liang Zilu, Yi Zilu Connect the heat release side entrance of evaporator 14, another sub- road connection CO2Put respectively from evaporator 14 on the entrance of bypass valve 17, two sub- roads Hot side outlet and CO2Bypass valve 17 out again and converges for all the way, and is connected to the entrance of main compressor 7, and main compressor 7 goes out The heat absorption side entrance of mouth connection cryogenic heat exchanger 4, the heat absorption side outlet of cryogenic heat exchanger 4 from recompression machine 5 with exporting come out first Road is converged again, is connected to the heat absorption of high temperature regenerator 3 side entrance, the heat absorption side outlet connection high temperature heat source heat exchange of high temperature regenerator 3 The heat absorption of device 1 side entrance, the heat absorption side outlet of high temperature heat source heat exchanger 1 connects back to the formation supercritical carbon dioxide mine-laying of the entrance of turbine 2 Cycle subsystem loop；
The Lithium Bromide Absorption Refrigeration Cycle subsystem loop include absorber 13, the concentrated solution outlet side of absorber 13 according to It is secondary to be connected by the first frequency converter 11 and solution pump 10 with the heat absorption of solution heat exchanger 9 side entrance, the heat absorbing side of solution heat exchanger 9 The outlet connection entrance of generator 8, the outlet of generator 8 is divided into water vapour side and the branch road of concentrated solution side two, the collateral road connection of water vapour The entrance of condenser 16, the outlet of condenser 16 is connected to the entrance of evaporator 14, the outlet of evaporator 14 connection by steam throttle valve 15 To the inlet steam side of absorber 13；The collateral way outlet connection solution heat exchanger 9 heat release side entrance of the concentrated solution of generator 8, solution The heat release side outlet of heat exchanger 9 is connected to the entrance weak solution side of absorber 13 by solution choke valve 12.
The control system of the main compressor inlet temperature includes sensor, can compile formula cyclelog and executing agency； The inlet temperature sensor 18 of main compressor 7 and air temperature sensor 22 are control system sensor, from two temperature sensors Collect and process machine inlet temperature signal and real-time air temperature signal, and incoming compile in formula cyclelog 21；Then it can compile Formula cyclelog 21 sends control instruction according to the temperature signal of acquisition, and controls executing agency to complete control command；Control System Zhong Youliangzu executing agencies, first group is CO2The frequency converter 11 of bypass valve 17 and first, for coordinating regulation lithium bromide Absorption refrigeration amount is with entering the CO absorbed heat in lithium-bromide absorption-type refrigerating machine2Working medium share；Second group is the second frequency converter 19, For adjusting the amount of cooling water of forecooler 6.
The present invention possesses following advantage：
1st, for second law of thermodynamics angle, supercritical CO proposed by the present invention2Brayton cycle is inhaled with lithium bromide Receipts formula kind of refrigeration cycle coupled system is by supercritical CO2Brayton cycle enters a part of heat in the waste heat that cooler discharges originallyCold is converted to by Lithium Bromide Absorption Refrigeration CycleIt is used, so that it is always useful to reduce coupling circulation system Can irreversible loss, increase the circulatory system the thermal efficiency andEfficiency.
2nd, can be by the control of main compressor inlet temperature in slightly above critical point by coupling lithium-bromide absorption-type refrigerating machine Level.So as to the S-CO controlled compared to compressor-free inlet temperature2Circulation, thermal efficiency of cycle can relative lifting 5- with net output work 15%.
3rd, Lithium Bromide Absorption Refrigeration Cycle has good Study on Variable Condition Features, in S-CO2Circulation side variable working condition causes hair Thermal source CO in raw device2When working medium flow changes, correspondingly adjust lithium bromide side working medium flow and hardly bring refrigerating efficiency Significant change, so as to meet the steady operation of coupling cycle during variable working condition.Thus use CO2Cooling flow-lithium bromide is molten The control method that liquid pump is coordinated based on control methods steadily can efficiently realize that main compressor inlet temperature is controlled.
Brief description of the drawings
Fig. 1 is the structural representation of present system.
Fig. 2 is the control method flow chart of present system.
Embodiment
The present invention is described in further details with reference to the accompanying drawings and detailed description：
(1) the coupling circulation system method of operation
The present invention proposes a kind of coupling circulation system for solar energy thermal-power-generating, and coupling circulation system can be divided into two Supercritical carbon dioxide Brayton cycle and Lithium Bromide Absorption Refrigeration Cycle two subsystems, and pass through generator 8 and evaporation Device 14 is coupled as a holonomic system, includes the control system of main compressor inlet temperature.
In supercritical carbon dioxide Brayton cycle subsystem：CO2Working medium enters after being absorbed heat from high temperature heat source heat exchanger 1 Circulate in turbine 2, circulate the CO of the middle outlet of turbine 22Working medium sequentially enters the cold side of high temperature regenerator 3 and cryogenic regenerator 4, It is divided into two fluids in the heat release side outlet of cryogenic regenerator 4, wherein one, which enters, successively enters the heat release of generator 8 so into pre- Cooled down in cooler 6, be divided into two share tributaries again afterwards, a whiff of tributary, which enters in evaporator 14, absorbs heat, and another share tributary is then By CO2Then bypass valve 17 converges for one tributary with preceding a whiff of tributary.Pressed subsequently into main compressor 7 Contracting, subsequently into the heat absorbing side of cryogenic regenerator 4.Another burst of tributary enters recompression machine 5, the fluid after recompression machine compression One is re-mixed into first strand of fluid come out from the heat absorbing side of cryogenic regenerator 4, is absorbed heat into high temperature regenerator 3, finally Return in high temperature heat source heat exchanger 1.
In lithium bromide absorbing type refrigeration subsystem：Dilute lithium-bromide solution is in the presence of solution pump 10 through solution heat exchanger Enter after 9 heat absorptions in generator 8, by from CO in generator2The heating of working medium thermal source, until the water in boiling, solution Divide and be vaporizated into water vapour constantly, and obtain dense lithium-bromide solution in generator 8.Dense lithium-bromide solution is through solution heat exchanger Absorber 13 is entered by solution choke valve 12 after 9 heat exchange, and the water vapour evaporated is put as refrigerant in condenser 16 Go out heat and condense into water, enter evaporator 14 after the decompression of steam throttle valve 15, water is inhaled under low pressure in evaporator 14 Receive heat steam.
(2) main compressor inlet temperature control method
Because the change of temperature can cause forecooler to be changed with lithium-bromide absorption-type refrigerating machine operating mode, so that will likely Cause the rising of the inlet temperature of main compressor 7 or be reduced under critical point, influence the safe and highly efficient operation of coupling circulation system； Thus the inlet temperature of main compressor 7 need in real time be controlled according to temperature condition, to have kept the inlet temperature of main compressor 7 both In reduced levels, while being consistently higher than critical point temperature again；The inlet temperature control method of main compressor 7 includes CO2Cooling flow- Lithium-bromide solution pump coordinates control methods and forecooler fan frequency conversion control methods.
(1)CO2Cooling flow-lithium-bromide solution pump coordinates control methods
Ignore the crushing of flow process, then to the working medium of the entrance of main compressor 7, by the conservation of mass and the public affairs of the conservation of energy Formula：
m1=mCooling+mBypass (1)
m1·Cp1·T1=mCooling·CpCooling·TCooling+mBypass·CpBypass·TBypass (2)
Wherein：m1It is the CO2 mass flows of the entrance of main compressor 7；mCoolingIt is the CO2 matter that heat release cools in evaporator 14 Measure flow；mBypassIt is by CO2The CO of bypass valve 172Mass flow；Cp1For the entrance CO of main compressor 72Specific heat capacity；CpCooling The CO exported for evaporator 142Specific heat capacity；CpBypassThe CO exported for bypass valve2Specific heat capacity；T1It is the entrance of main compressor 7 CO2 temperature；TCoolingIt is the CO2 temperature in evaporator 14 after heat release cooling；TBypassCO after bypass valve 172Temperature Degree；
Therefore, the inlet temperature of main compressor 7 is calculated by below equation：
T1=(mCooling·CpCooling·TCooling+mBypass·CpBypass·TBypass)/m1·Cp1 (3)
CO2Cooling flow-lithium-bromide solution pump control method for coordinating changes solution and followed by acting on the first frequency converter 11 Ring multiplying power, and CO is adjusted simultaneously2The aperture of bypass valve 17；T that can simultaneously in adjustment type 3CoolingWith mCooling, so that quick effective Change the inlet temperature T of main compressor 71, thus O2Cooling flow-lithium-bromide solution pump control method for coordinating is the entrance of main compressor 7 Temperature T1Main adjusting method.
(2) forecooler fan frequency conversion control methods
Ignore the crushing of Working fluid flow process in forecooler, exchange heat balance in forecooler：
mCO2·CpCO2·(TCO2, enters‐TCO2, goes out)=mair·Cpair·(TAir, enters‐TAir, goes out) (4)
mCO2·CpCO2·(TCO2, enters‐TCO2, goes out)=KA Δs T (5)
Wherein：mCO2For CO in forecooler 62Mass flow；CpCO2To pass through the CO in forecooler 62Mean specific heat； mairFor the mass flow of air in forecooler 6；CpairFor the mean specific heat of air in forecooler 6；TCO2, entersWith TCO2, goes outRespectively For forecooler CO2Out temperature；TAir, entersWith TAir, goes outThe respectively out temperature of forecooler air；K is total for forecooler The coefficient of heat transfer；A is the total heat exchange area of forecooler；Δ T is forecooler heat exchange mean temperature difference；
The matter that forecooler fan frequency conversion control methods pass through the control air side air of 19 frequency shift forecooler of the second frequency converter 6 Measure flow mair, so that by changing CO in forecooler2Heat exchange amount adjust CO2Outlet temperature TCO2, goes out, and then to main compressor 7 inlet temperature T1It is adjusted；Because forecooler thermal inertia is larger, and the regulation of this method can not directly act on CO2Work Matter, effect is also vulnerable to the influence of inlet air temp, particularly under the conditions of hot weather, thus regulating effect is relative has Limit, is pretended as the inlet temperature T of main compressor 71Adjust householder method.
Control method implementation steps in suction port of compressor proposed by the present invention are：
Step 1：Real-time temperature is read in, the entrance target temperature T of main compressor 7 is determined according to temperature1t；
Step 2：Gather the inlet temperature T of main compressor 71If, T1With T1tThe temperature difference is more than 1 DEG C, control system action；
Step 3：CO is used first2Cooling flow-lithium-bromide solution pump control method for coordinating is compressed machine inlet temperature Control：Work as T1More than T1tWhen, by increasing the frequency of the first frequency converter 11, to increase solution circulating ratio, and reduce CO2Bypass is adjusted The aperture of valve 17 is saved, to increase the CO into the heat release of evaporator 142Flow；Otherwise work as T1Less than T1tWhen, by reducing the first frequency conversion The frequency of device 11, to reduce solution circulating ratio, and increases CO2The aperture of bypass valve 17, to reduce into the heat release of evaporator 14 CO2Flow；
Step 4：As the CO described in progress step 32Cooling flow-lithium-bromide solution pump control method for coordinating is adjusted to The frequency of one frequency converter 11 reaches T after the upper limit or lower limit1Desired value is also unable to reach, by acting on the control on the second frequency converter 19 Signal processed changes rotation speed of fan adjustment forecooler 6 outlet CO2Temperature, and then realize to T1It is adjusted；
Step 5：When two kinds of adjusting methods can not all make the inlet temperature T of main compressor 7 in step 3 and step 41Reach specified Value, then adjust target chilling temperature T1t, to be matched；If working as T1It is reduced to close to during critical point, is alarmed, to prevent enters The entrance working medium state of main compressor 7 enters two-phase section, and main compressor 7 is caused to damage.

Claims (2)

1. a kind of coupling circulation system for solar energy thermal-power-generating, it is characterised in that：Including passing through generator (8) and evaporator (16) the supercritical carbon dioxide Brayton cycle subsystem and Lithium Bromide Absorption Refrigeration Cycle subsystem of coupling, and main pressure The control system of contracting machine inlet temperature；
The supercritical carbon dioxide Brayton cycle subsystem loop includes circulation turbine (2), circulation turbine (2) outlet connection High temperature regenerator (3) heat release side entrance, the heat release side entrance of high temperature regenerator (3) heat release side outlet connection cryogenic regenerator (4), The heat release side outlet of cryogenic regenerator (4) is divided into two-way：The first via connects recompression machine (5) entrance；Second tunnel connects generator (8) thermal source side entrance, generator heat source side (8) outlet connection forecooler (6) heat release side entrance, forecooler (6) heat release side outlet It is divided into Liang Zilu, sub- road connection evaporator (14) heat release side entrance, another sub- road connection CO2Bypass valve (17) entrance, Two sub- roads are respectively from evaporator (14) heat release side outlet and CO2Bypass valve (17) comes out again and converged for all the way, and connects To main compressor (7) entrance, main compressor (7) outlet connection cryogenic heat exchanger (4) heat absorption side entrance, cryogenic heat exchanger (4) is inhaled Hot side outlet is converged again with the first via from recompression machine (5) outlet out, is connected to high temperature regenerator (3) heat absorbing side and enters Mouthful, high temperature regenerator (3) heat absorption side outlet connection high temperature heat source heat exchanger (1) heat absorption side entrance, high temperature heat source heat exchanger (1) is inhaled Hot side outlet connects back to turbine (2) entrance formation supercritical carbon dioxide Brayton cycle subsystem loop.
The Lithium Bromide Absorption Refrigeration Cycle subsystem loop include absorber (13), absorber (13) concentrated solution outlet side according to It is secondary to be connected by the first frequency converter (11) and solution pump (10) with solution heat exchanger (9) heat absorption side entrance, solution heat exchanger (9) heat absorption side outlet connection generator (8) entrance, generator (8) outlet is divided into water vapour side and the branch road of concentrated solution side two, and water steams Collateral road connection condenser (16) entrance of vapour, condenser (16) outlet connects evaporator (14) by steam throttle valve (15) and entered Mouthful, evaporator (14) outlet connection absorber (13) inlet steam side；The collateral way outlet connection solution heat of generator (8) concentrated solution Exchanger (9) heat release side entrance, solution heat exchanger (9) heat release side outlet is connected to absorber by solution choke valve (12) (13) entrance weak solution side；
The control system of the main compressor inlet temperature includes sensor, can compile formula cyclelog and executing agency；Main pressure Contracting machine (7) inlet temperature sensor (18) is control system sensor with air temperature sensor (22), from two TEMPs Device collect and process machine inlet temperature signal and real-time air temperature signal, and incoming compile in formula cyclelog (21)；Then Formula cyclelog (21) can be compiled control instruction is sent according to the temperature signal of acquisition, and control executing agency to complete control life Order；Control system Zhong Youliangzu executing agencies, first group is CO2Bypass valve (17) and the first frequency converter (11), for assisting Key section lithium bromide absorbing type refrigeration amount is with entering the CO absorbed heat in lithium-bromide absorption-type refrigerating machine2Working medium share；Second group is Second frequency converter (19), for adjusting forecooler (6) amount of cooling water.
2. it is used for the control method of the coupling circulation system of solar energy thermal-power-generating described in claim 1, it is characterised in that：Main compression The control method of machine inlet temperature control method is as follows：
Because the change of temperature can cause forecooler to be changed with lithium-bromide absorption-type refrigerating machine operating mode, so as to would potentially result in The rising of main compressor (7) inlet temperature is reduced under critical point, influences the safe and highly efficient operation of coupling circulation system；Cause And main compressor (7) inlet temperature need in real time be controlled according to temperature condition, to keep main compressor (7) inlet temperature Both in reduced levels, while being consistently higher than critical point temperature again；Main compressor (7) inlet temperature control method includes CO2Cooling Flow-lithium-bromide solution pump coordinates control methods and forecooler fan frequency conversion control methods；
(1)CO2Cooling flow-lithium-bromide solution pump coordinates control methods
Ignore the crushing of flow process, then to the working medium of main compressor (7) entrance, by the formula of the conservation of mass and the conservation of energy：
m1=mCooling+mBypass (1)
m1·Cp1·T1=mCooling·CpCooling·TCooling+mBypass·CpBypass·TBypass (2)
Wherein：m1It is the CO2 mass flows of main compressor (7) entrance；mCoolingIt is the CO2 mass that heat release cools in evaporator (14) Flow；mBypassIt is by CO2The CO of bypass valve (17)2Mass flow；Cp1For main compressor (7) entrance CO2Specific heat capacity； CpCoolingThe CO exported for evaporator (14)2Specific heat capacity；CpBypassThe CO exported for bypass valve2Specific heat capacity；T1It is main compressor (7) the CO2 temperature of entrance；TCoolingIt is the CO2 temperature in evaporator (14) after heat release cooling；TBypassIt is by bypass valve (17) CO after2Temperature；
Therefore, main compressor (7) inlet temperature is calculated by below equation：
T1=(mCooling·CpCooling·TCooling+mBypass·CpBypass·TBypass)/m1·Cp1 (3)
CO2Cooling flow-lithium-bromide solution pump control method for coordinating changes solution circulation by acting on the first frequency converter (11) Multiplying power, and CO is adjusted simultaneously2Bypass valve (17) aperture；T that can simultaneously in adjustment type (3)CoolingWith mCooling, so as to quickly have Effect changes main compressor (7) inlet temperature T1, thus O2Cooling flow-lithium-bromide solution pump control method for coordinating is main compressor (7) inlet temperature T1Main adjusting method；
(2) forecooler fan frequency conversion control methods
Ignore the crushing of Working fluid flow process in forecooler, exchange heat balance in forecooler：
mCO2·CpCO2·(TCO2, enters-TCO2, goes out)=mair·Cpair·(TAir, enters-TAir, goes out) (4)
mCO2·CpCO2·(TCO2, enters-TCO2, goes out)=KA Δs T (5)
Wherein：mCO2For CO in forecooler (6)2Mass flow；CpCO2To pass through the CO in forecooler (6)2Mean specific heat； mairFor the mass flow of air in forecooler (6)；CpairFor the mean specific heat of air in forecooler (6)；TCO2, entersWith TCO2, goes out Respectively forecooler CO2Out temperature；TAir, entersWith TAir, goes outThe respectively out temperature of forecooler air；K is forecooler Composite Walls；A is the total heat exchange area of forecooler；Δ T is forecooler heat exchange mean temperature difference；
Forecooler fan frequency conversion control methods are by controlling the second frequency converter (19) frequency shift forecooler (6) air side air mass flow mair, so that by changing CO in forecooler2Heat exchange amount adjust CO2Outlet temperature TCO2, goes out, and then main compressor (7) is entered Mouth temperature T1It is adjusted；Because forecooler thermal inertia is larger, and the regulation of this method can not directly act on CO2Working medium, effect Fruit is also vulnerable to the influence of inlet air temp, and particularly under the conditions of hot weather, thus regulating effect is relatively limited, pretends For main compressor (7) inlet temperature T1Adjust householder method.
The implementation steps of the main compressor inlet temperature control method are：
Step 1：Real-time temperature is read in, main compressor (7) entrance target temperature T is determined according to temperature1t；
Step 2：Gather main compressor (7) inlet temperature T1If, T1With T1tThe temperature difference is more than 1 DEG C, control system action；
Step 3：CO is used first2Cooling flow-lithium-bromide solution pump control method for coordinating is compressed the control of machine inlet temperature： Work as T1More than T1tWhen, by increasing the first frequency converter (11) frequency, to increase solution circulating ratio, and reduce CO2Bypass regulation Valve (17) aperture, to increase the CO into evaporator (14) heat release2Flow；Otherwise work as T1Less than T1tWhen, become by reduction by first Frequency device (11) frequency, to reduce solution circulating ratio, and increases CO2Bypass valve (17) aperture, enters evaporator to reduce (14) CO of heat release2Flow；
Step 4：As the CO described in progress step 32Cooling flow-lithium-bromide solution pump control method for coordinating, which is adjusted to first, to be become Frequency device (11) frequency reaches T after the upper limit or lower limit1Desired value is also unable to reach, by acting on the control on the second frequency converter (19) Signal processed changes rotation speed of fan adjustment forecooler (6) outlet CO2Temperature, and then realize to T1It is adjusted；
Step 5：When two kinds of adjusting methods can not all make main compressor (7) inlet temperature T in step 3 and step 41Reach rated value, Then adjust target chilling temperature T1t, to be matched；If working as T1It is reduced to close to during critical point, is alarmed, to prevent enters master Compressor (7) entrance working medium state enters two-phase section, and main compressor (7) is caused to damage.
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CN107514837A (en) * 2017-09-04 2017-12-26 中国科学院工程热物理研究所 The cooling heating and power generation system that heat pump couples with supercritical carbon dioxide Brayton cycle
CN108871825A (en) * 2018-05-09 2018-11-23 天津水泥工业设计研究院有限公司 A method of judging cement kiln hot working efficiency
CN108643982A (en) * 2018-07-04 2018-10-12 西安热工研究院有限公司 A kind of overcritical Brayton cycle electricity generation system and method that band refrigeration is cooling
CN110080842A (en) * 2019-05-08 2019-08-02 上海发电设备成套设计研究院有限责任公司 A kind of closed cycle electricity generation system of integrated absorption heat pump
CN110761863A (en) * 2019-11-21 2020-02-07 西安交通大学 Supercritical CO utilizing low-value heat energy of mine return air gas and coal slime2Cogeneration system
CN111022138A (en) * 2019-12-18 2020-04-17 北京石油化工学院 Supercritical carbon dioxide power generation system based on absorption heat pump waste heat recovery
CN112432369A (en) * 2020-11-26 2021-03-02 北京石油化工学院 Cold, heat and electricity three-generation system based on supercritical carbon dioxide circulation and groove type solar absorption refrigeration
CN112943396A (en) * 2021-02-07 2021-06-11 西安交通大学 Mixed working medium supercritical Brayton cycle system with adjustable working medium critical point and method
CN113251462A (en) * 2021-05-14 2021-08-13 西安交通大学 Combined cooling, heating and power system and method for coupling Brayton cycle and absorption refrigeration cycle
CN114198173A (en) * 2021-11-04 2022-03-18 合肥通用机械研究院有限公司 Full-backheating Brayton cycle and absorption refrigeration integrated electricity-cold combined supply system
CN114198173B (en) * 2021-11-04 2023-10-13 合肥通用机械研究院有限公司 Electric cooling combined supply system integrating full-regenerative brayton cycle and absorption refrigeration
CN114017942A (en) * 2021-11-30 2022-02-08 华能营口热电有限责任公司 Solar supercritical carbon dioxide combined cooling heating and power system and working method thereof
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CN114687825B (en) * 2022-04-02 2023-08-25 西安热工研究院有限公司 Cold end temperature control strategy of supercritical carbon dioxide circulating generator set

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