CN113790469B - Heat supply reactor cold and heat combined supply system with heat storage and peak regulation functions and operation method thereof - Google Patents
Heat supply reactor cold and heat combined supply system with heat storage and peak regulation functions and operation method thereof Download PDFInfo
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- 238000005338 heat storage Methods 0.000 title claims abstract description 147
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- 230000008859 change Effects 0.000 claims abstract description 6
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- 238000001816 cooling Methods 0.000 claims description 32
- 238000010521 absorption reaction Methods 0.000 claims description 26
- 239000007789 gas Substances 0.000 claims description 21
- 230000001932 seasonal effect Effects 0.000 claims description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 11
- 239000003546 flue gas Substances 0.000 claims description 11
- 239000002689 soil Substances 0.000 claims description 11
- 238000005057 refrigeration Methods 0.000 claims description 6
- 239000002918 waste heat Substances 0.000 claims description 5
- 238000011234 economic evaluation Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 239000000779 smoke Substances 0.000 claims 3
- 229910052799 carbon Inorganic materials 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
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- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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- 239000008400 supply water Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid systems
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
- G21C15/14—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from headers; from joints in ducts
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/24—Promoting flow of the coolant
- G21C15/243—Promoting flow of the coolant for liquids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a heat supply pile cold and heat combined supply system with heat storage and peak regulation functions and an operation method thereof, and provides a corresponding system constant volume optimization method. At the time of low cold/heat load and non-heat supply and cold supply time in the day of a user side, the hot water heat storage tank and the cross-season heat storage buried pipe device are respectively used for storing the redundant heat output by the low-temperature heat supply pile, and then the redundant heat is released at the time of high cold/heat load in the day and the time of high cold/heat load in the heat supply and cold supply time, and meanwhile, the change characteristics of the cold/heat load in different seasons and different times in the day are considered, so that the peak regulation of heat storage in the day and cross-season is realized. The invention realizes the accurate matching of the heat source supply side and the cold and heat load demand side, not only ensures the high-efficiency flexible operation of the unit, but also reduces the initial investment of the system.
Description
Technical Field
The invention relates to the field of comprehensive utilization of nuclear energy, in particular to a heat supply reactor cold and heat cogeneration system with a heat storage and peak regulation function and an operation method thereof.
Background
With the continuous promotion of the urbanization process, the urban central heating area in China is greatly increased. At present, the mode of coal-fired cogeneration and regional coal-fired boilers is mostly adopted for heating in winter in cities in China, and a large amount of carbon dioxide, nitrogen sulfide and dust particles are generated by burning coal, so that the northern areas are seriously disturbed by haze in winter, and the safety and the body health of people are seriously harmed.
The great strategic decision made by the middle of the party is to strive for carbon peak reaching 2030 years ago and carbon neutralization 2060 years ago. Under the targets of carbon peak reaching and carbon neutralization, the energy system in China will continue to accelerate clean low-carbon transformation. The nuclear energy has the advantages of no greenhouse gas emission in the production process, small carbon emission in the whole life, high energy density, no intermittency and the like, and under the aim of double carbon, the comprehensive utilization of the nuclear energy has more development opportunities. Compared with other heating modes, nuclear energy heating has multiple advantages of cleanness, low carbon, stable operation, economy, feasibility and the like, is an important heating mode which is rare at present, can replace primary energy and meets the requirement of large-scale central heating basic load. The low-temperature heat supply reactor as a nuclear energy heat supply form has the advantages of high reliability, mature technology, simple system, stable operation, small occupied area and the like, and can effectively reduce carbon emission and improve the energy structure of China when being used for supplying heat to residents.
The phenomenon that the heating heat load of residents changes periodically day and night in seasonal fluctuation exists, namely, the heating heat load has great difference in different periods of heating seasons and different moments of the same day. In view of the time-varying characteristic of the periodic variation of the heating heat load, the output power of the heat load supply side needs to be frequently adjusted, and the output power of the reactor core is not suitable to be frequently adjusted in order to ensure the safe and stable operation of the low-temperature heat supply reactor. In order to effectively solve the contradiction between the heat supply pile and the heat load supply and demand, an intra-day heat storage peak regulation device and a cross-season heat storage peak regulation device are added to respectively realize intra-day peak regulation and cross-season peak regulation.
In addition, if the heat supply pile is only used for heat supply, the annual utilization hours of the equipment is limited, the problem of waste heat discharge in non-heat supply seasons needs to be considered, and the hot water of the heat supply pile can be used for driving the absorption refrigerator to supply cold in summer, so that the comprehensive application of the heat supply pile is realized. Because the cold load demand of the user side also has time-varying characteristics, the peak regulation of cooling can be carried out through the corresponding heat storage device.
When designing the combined cooling and heating system of the heat supply pile, because the initial investment cost of the heat supply pile is higher, and the peak valley value of the cooling and heating load exists, the appropriate capacity is selected for each device of the unit according to the cooling and heating load condition of the region where the heat supply pile is located, thereby obtaining the system configuration with the best economy, and the constant volume optimization of the combined cooling and heating system of the heat supply pile is very necessary.
Disclosure of Invention
The invention provides a heat supply reactor cold and heat cogeneration system with heat storage and peak regulation functions and an operation method thereof, and provides a corresponding system constant volume optimization method, aiming at the problems that the annual utilization time of a heat supply reactor is low and the cold and heat loads on the demand side have time-varying characteristics. In non-heating seasons and non-cooling seasons, heat output by the three loops of the heat supply pile is subjected to cross-season heat storage through the buried pipe device. In the early and late stages of cooling in summer, when the cooling load is low, the cooling load requirement of a user end can be met by partial power operation of the heat supply pile, and at the moment, peak shaving cooling in the day is only needed; in summer cold supply peak period, when the full load operation of the heat supply pile can not meet the cold load demand of a user terminal, season-crossing peak regulation and in-day peak regulation are simultaneously carried out according to the cold load demand of the user in different periods. In the beginning and end of winter heat supply, when the heat supply load is low, the heat supply pile can meet the heat load demand of a user end by partial power operation, and at the moment, the peak regulation heat supply in the day is only needed; in the peak period of heat supply in winter, when the heat supply pile-up load operation can not meet the cold load demand of a user terminal, season-crossing peak regulation and day-in peak regulation are simultaneously carried out according to the actual heat load demand of the user. In order to ensure that the system can meet the heat and cold supply requirements under extreme working conditions, and meanwhile, a standby heat source is added, the system is also provided with a gas boiler to participate in peak shaving, and the flue gas waste heat of the gas boiler can still be used for driving a ground source absorption heat pump to supply hot water for users, so that the energy gradient utilization is realized. The heat storage and peak regulation combined cooling and heating system provided by the invention can reduce the initial investment of the system and realize the efficient comprehensive utilization of the heat supply reactor.
In order to achieve the purpose, the invention adopts the following technical scheme:
a heat supply pile cold and heat combined supply system with heat storage and peak shaving functions comprises a low-temperature heat supply pile 1, a first circulating water pump 2, a first heat exchanger 3, a second circulating water pump 4, a second heat exchanger 5, an in-day heat storage hot water heat storage tank 6, a first valve 7, a second valve 8, a third circulating water pump 9, a third valve 10, a fourth valve 11, a fourth circulating water pump 12, a fifth valve 13, a cross-season heat storage buried pipe device 14, a sixth valve 15, a fifth circulating water pump 16, a seventh valve 17, an eighth valve 18, a sixth circulating water pump 19, a ninth valve 20, an absorption refrigerator 21, a tenth valve 22, an eleventh valve 23, a seventh circulating water pump 24, a twelfth valve 25, a thirteenth valve 26, a gas boiler 27, a bypass valve 28, a flue gas type ground source absorption heat pump 29 and a heating heat user 30;
a hot side outlet of a primary loop of the low-temperature heat supply reactor 1 is sequentially communicated with a hot side inlet of a first circulating water pump 2 and a hot side inlet of a first heat exchanger 3 through connecting pipes to transmit heat to a second loop, a hot side outlet of a second loop of the first heat exchanger 3 is sequentially communicated with a hot side inlet of a second circulating water pump 4 and a hot side inlet of a second heat exchanger 5 through connecting pipes to transmit heat to a third loop, and a hot side outlet of a third loop of the second heat exchanger 5 is sequentially communicated with a fourth valve 11 and a fourth circulating water pump 12 through connecting pipes; the outlet of the fourth circulating water pump 12 is divided into four paths, and the first path is sequentially communicated with the fifth valve 13 and the hot side inlet of the seasonal heat storage buried pipe device 14 through connecting pipes; the second path is communicated with a second valve 8 and a hot side inlet of the daily heat storage hot water heat storage tank 6 in sequence through a connecting pipe; the third path is communicated with a tenth valve 22 and an inlet of a heating user 30 in turn through a connecting pipe; the fourth path is communicated with an eighth valve 18, a sixth circulating water pump 19 and an inlet of an absorption refrigerator 21 in sequence through connecting pipes; the outlet of the cold side of the solar heat-storage hot water heat storage tank 6 is communicated with the inlet of the cold side of the second heat exchanger 5 through a first valve 7, and the outlet of the hot side of the solar heat-storage hot water heat storage tank 6 is communicated with the inlet of a heating user 30 through a third valve 10 and a third circulating water pump 9;
an outlet of a heating heat user 30 and an outlet of an absorption refrigerator 21 are respectively communicated with cold side backwater of the three loops through an eleventh valve 23 and a ninth valve 20; the cold-side backwater of the three loops is divided into four loops, and the first loop is sequentially communicated with a twelfth valve 25 and a cold-side inlet of a gas boiler 27 through a connecting pipe; the second path is communicated with a first valve 7 and a cold side inlet of an in-day heat storage hot water heat storage tank 6 in turn through a connecting pipe; the third path is communicated with a seventh valve 17 and a cold side inlet of the season-crossing heat storage buried pipe device 14 in sequence through a connecting pipe; the fourth path is communicated with a cold side inlet of the second heat exchanger 5 through a connecting pipe; the hot side outlet of the heat storage buried pipe device 14 across seasons is communicated with hot side water supply of the three loops through a sixth valve 15 and a fifth circulating water pump 16 in sequence; a cold side outlet of the gas boiler 27 is communicated with hot side water supply of the three loops through a thirteenth valve 26 and a seventh circulating water pump 24 in sequence; the flue gas outlet of the gas boiler 27 is communicated with a flue gas type ground source absorption heat pump 29.
According to the operation method of the heat supply pile cold and heat combined supply system with the heat storage and peak shaving functions, when heat is stored in the solar heat storage hot water and heat storage tank 6, hot water at the outlet of the fourth circulating water pump 12 enters the hot side inlet of the solar heat storage hot water and heat storage tank 6 through the second valve 8 to store heat, meanwhile, cold water with the same volume at the cold side outlet of the solar heat storage hot water and heat storage tank 6 flows out of the solar heat storage hot water and heat storage tank 6 through the first valve 7 and then flows to the cold side inlet of the second heat exchanger 5; when heat is released from the in-day heat storage hot water heat storage tank 6, hot water stored in the in-day heat storage hot water heat storage tank 6 sequentially passes through the third valve 10 and the third circulating water pump 9 to be supplied to the hot side of the three loops and converged, and then is conveyed to the user side to release heat, so that heat supply or cold supply is realized, and meanwhile, cold water with the same volume is returned from the cold side backwater of the three loops to the cold side inlet of the in-day heat storage hot water heat storage tank 6 through the first valve 7.
When the season-crossing heat storage buried pipe device 14 is used for heat storage, hot water at the outlet of the fourth circulating water pump 12 enters the season-crossing heat storage buried pipe device 14 through the fifth valve 13 to exchange heat with soil, heat is stored in the soil around the buried pipe, and then hot cold water is discharged and returns to the cold water side of the three-loop through the seventh valve 17; when the cross-season heat storage buried pipe device 14 is used for releasing heat, the three-loop cold-side backwater enters the cross-season heat storage buried pipe device 14 through the seventh valve 17 to absorb heat and raise the temperature, and then is communicated with the three-loop hot-side water supply through the sixth valve 15 and the fifth circulating water pump 16 in sequence, and then heat supply or cold supply is carried out.
The return water at the cold side of the three loops enters the gas boiler 27 through the twelfth valve 25 to be heated, the heated hot water is communicated with the water supply at the hot side of the three loops through the thirteenth valve 26 and the seventh circulating water pump 24 in sequence, and then heat supply or cold supply is carried out, and meanwhile, the cold water with the same volume at the cold side of the three loops returns to the gas boiler 27 through the twelfth valve 25. On the other hand, the temperature of the flue gas generated by the gas boiler can reach 120-180 ℃, and the residual heat can be used for driving the ground source absorption heat pump 29 to prepare medium-low temperature hot water meeting the living requirements.
The constant volume optimization method of the heat supply pile cold and heat combined supply system with the heat storage and peak regulation functions combines the meteorological data of the areas where the users are located with the historical years according to the types of the users in the heat supply and cold supply areas, so that the daily and hourly cold and heat load change characteristics under the statistical rule are obtained. According to the obtained user cold and hot load change characteristics, the capacity of each device of the system can be preliminarily configured. On the premise of knowing initial investment cost and operation and maintenance cost of each device such as the low-temperature heat supply reactor 1, the in-day heat storage hot water heat storage tank 6, the cross-season heat storage buried pipe device 14, the gas boiler 27, the absorption refrigerator 21 and the like, an intelligent algorithm is used for optimizing and analyzing the whole system by combining multiple economic evaluation indexes such as an annual cost method, a dynamic investment recovery period and the like, so that a system configuration scheme with the best economic performance is obtained.
According to the heat supply pile cold and heat combined supply system with the heat storage and peak regulation functions, the daily peak regulation and the cross-season heat storage and peak regulation are respectively carried out through the daily peak regulation and heat storage tank and the cross-season heat storage buried pipe device, the change characteristics of cold and heat loads in different seasons and different moments in the day are considered, the accurate matching of a heat source supply side and a cold and heat load demand side is realized, the efficient and flexible operation of a unit is ensured, and the initial investment of the system is reduced. Compared with a conventional hot water heat storage tank, the cost for large-scale seasonal heat storage by using the buried pipe is lower, and the system economy can be greatly improved by using the buried pipe to perform seasonal peak regulation. According to the invention, the gas-fired boiler is used for participating in peak shaving of cold and hot loads, so that the reliability of the whole cold and hot combined supply system can be improved, the gradient utilization of heat is realized by utilizing the waste heat of the flue gas, the energy utilization efficiency is improved, and the effects of energy conservation and emission reduction are obvious. When a heat supply reactor cold and heat cogeneration system is designed, the constant volume optimization method provided by the invention can obtain a system configuration scheme with optimal economy.
Drawings
Fig. 1 is a schematic diagram of a heat supply reactor cold-heat co-generation system with heat storage and peak regulation functions.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the heat supply pile combined cooling and heating system with heat storage and peak shaving functions according to the present embodiment includes a low-temperature heat supply pile 1, a first circulating water pump 2, a first heat exchanger 3, a second circulating water pump 4, a second heat exchanger 5, an in-day heat storage hot water heat storage tank 6, a first valve 7, a second valve 8, a third circulating water pump 9, a third valve 10, a fourth valve 11, a fourth circulating water pump 12, a fifth valve 13, a seasonal heat storage buried pipe device 14, a sixth valve 15, a fifth circulating water pump 16, a seventh valve 17, an eighth valve 18, a sixth circulating water pump 19, a ninth valve 20, an absorption refrigerator 21, a tenth valve 22, an eleventh valve 23, a seventh circulating water pump 24, a twelfth valve 25, a thirteenth valve 26, a gas boiler 27, a bypass valve 28, a flue gas type ground source absorption heat pump 29, and a heat consumer 30;
in non-heating seasons and non-cooling seasons, the fourth valve 11, the fifth valve 13, the seventh valve 17 and the fourth circulating water pump 12 are opened, hot side water supply of the low-temperature heat supply pile three loop enters the cross-season heat storage buried pipe device 14 through the fourth valve 11, the fourth circulating water pump 12 and the fifth valve 13 in sequence, all heat is stored in soil around the cross-season heat storage buried pipe device 14, and cold water with heat released returns to the cold water side of the three loops through the seventh valve 17.
At the beginning and end of cooling supply in summer, when the cooling load is lower, the cooling load demand of a user end can be met by partial power operation of the low-temperature heat supply reactor, and at the moment, peak shaving cooling in the day is only needed. When the cold load is low at night, a first valve 7, a second valve 8, a fourth valve 11, an eighth valve 18 and a ninth valve 20 are opened, a fourth circulating water pump 12 and a sixth circulating water pump 19 are opened, water supply at the hot side of the three loops is divided into two paths, one path flows to the heat storage hot water heat storage tank 6 in the day for heat storage, and the other path flows to an absorption refrigerator 21 for refrigeration; when the cold load is high in the daytime, the first valve 7, the third valve 10, the fourth valve 11, the eighth valve 18 and the ninth valve 20 are opened, the second valve 8 is closed, the third circulating water pump 9, the fourth circulating water pump 12 and the sixth circulating water pump 19 are opened, the hot water stored in the heat-storage hot water heat storage tank 6 in the daytime is converged with the hot-side water supply of the three circuits, and the converged hot water is supplied to the absorption refrigerator 21 for refrigeration.
In summer cooling peak period, when the full load operation of the heat supply pile can not meet the cooling load demand of a user terminal, season-crossing peak regulation and in-day peak regulation are simultaneously carried out according to the cooling load demand of the user in different periods of a cooling season. When the cold load is low at night, the first valve 7, the second valve 8, the fourth valve 11, the sixth valve 15, the seventh valve 17, the eighth valve 18 and the ninth valve 20 are opened, the fourth circulating water pump 12, the fifth circulating water pump 16 and the sixth circulating water pump 19 are opened, at the moment, the heat is stored in the day-long heat storage hot water heat storage tank 6, and the heat is released by the seasonal heat storage buried pipe device 14; when the cold load is high in the daytime, the first valve 7, the third valve 10, the fourth valve 11, the sixth valve 15, the seventh valve 17, the eighth valve 18 and the ninth valve 20 are opened, the third circulating water pump 9, the fourth circulating water pump 12, the fifth circulating water pump 16 and the sixth circulating water pump 19 are started, the hot water stored in the in-day heat storage hot water heat storage tank 6 and the hot water absorbed by the cross-season heat storage buried pipe device 14 and storing heat in soil are converged with the hot side water of the three loops, and the converged hot water is supplied to the absorption type refrigerating machine 21 for refrigeration, so that the in-day peak regulation and cross-season peak regulation of the cold supply of the system are realized.
At the beginning and end of winter heat supply, when the heat supply load is lower, the heat supply pile part of power operation can satisfy the heat load demand of the user side, and at the moment, only daily peak regulation heat supply needs to be carried out. When the heat load is low in the daytime, the first valve 7, the second valve 8, the fourth valve 11, the tenth valve 22 and the eleventh valve 23 are opened, the fourth circulating water pump 12 is started, water is supplied to the hot side of the three loops into two paths, one path of water flows to the heat storage hot water heat storage tank 6 in the daytime for heat storage, and the other path of water flows to the heating heat user 30 for heat supply; when the heat load is high at night, the first valve 7, the third valve 10, the fourth valve 11, the tenth valve 22 and the eleventh valve 23 are opened, the second valve 8 is closed, the third circulating water pump 9 and the fourth circulating water pump 12 are opened, the heat-storage hot-water heat storage tank 6 in the day combines the stored hot water with the hot-side water supply of the three loops, and the combined hot water is supplied to a heating user 30 for heating.
In the peak period of heat supply in winter, when the full load operation of the heat supply pile can not meet the cold load demand of a user terminal, the seasonal peak regulation and the daily peak regulation are simultaneously carried out according to the actual heat load demand of the user. When the heat load is low in the daytime, the first valve 7, the second valve 8, the fourth valve 11, the sixth valve 15, the seventh valve 17, the tenth valve 22 and the eleventh valve 23 are opened, the fourth circulating water pump 12 and the fifth circulating water pump 16 are opened, the heat storage is performed on the heat storage hot water heat storage tank 6 in the daytime, and the heat storage buried pipe device 14 across seasons performs heat release; when the heat load demand is high at night, the first valve 7, the third valve 10, the fourth valve 11, the sixth valve 15, the seventh valve 17, the tenth valve 22 and the eleventh valve 23 are opened, the third circulating water pump 9, the fourth circulating water pump 12 and the fifth circulating water pump 16 are started, the in-day heat storage hot water heat storage tank 6 enables stored hot water and hot water which absorbs soil heat in the cross-season heat storage buried pipe device 14 to be converged with hot water on the three-loop water supply side, the converged hot water is supplied to a heating user 30 for heating, and in-day heat supply peak shaving and cross-season heat supply peak shaving are achieved at the same time.
In order to ensure that the system can meet the heat and cold supply requirements under extreme working conditions, a standby heat source is added, and the system is also provided with a gas-fired boiler to participate in heat and cold supply peak regulation. When the peak regulation is carried out by using the gas boiler 27, the return water at the cold side of the three loops enters the gas boiler 27 through the twelfth valve 25 to be heated and heated, then sequentially passes through the thirteenth valve 26 and the seventh circulating water pump 24 to be converged with the supply water at the hot side of the three loops, and then the heat supply or the cold supply is carried out. In addition, the flue gas waste heat of the gas-fired boiler can still be used for driving a ground source absorption heat pump to supply hot water for users, so that the energy gradient utilization is realized.
Claims (6)
1. The heat supply pile cold and heat combined supply system with the heat storage and peak regulation functions is characterized by comprising a low-temperature heat supply pile (1), a first circulating water pump (2), a first heat exchanger (3), a second circulating water pump (4), a second heat exchanger (5), a solar heat storage hot water heat storage tank (6), a first valve (7), a second valve (8), a third circulating water pump (9), a third valve (10), a fourth valve (11), a fourth circulating water pump (12), a fifth valve (13), a seasonal heat storage ground pipe burying device (14), a sixth valve (15), a fifth circulating water pump (16), a seventh valve (17), an eighth valve (18), a sixth circulating water pump (19), a ninth valve (20), an absorption refrigerator (21), a tenth valve (22), an eleventh valve (23), a seventh circulating water pump (24), a twelfth valve (25), A thirteenth valve (26), a gas boiler (27), a bypass valve (28), a smoke type ground source absorption heat pump (29) and a heating heat user (30);
a hot side outlet of a primary loop of the low-temperature heat supply reactor (1) is sequentially communicated with a first circulating water pump (2) and a hot side inlet of a first heat exchanger (3) through connecting pipes to transmit heat to a second loop, a hot side outlet of the second loop of the first heat exchanger (3) is sequentially communicated with a second circulating water pump (4) and a hot side inlet of a second heat exchanger (5) through connecting pipes to transmit heat to a third loop, and a hot side outlet of the third loop of the second heat exchanger (5) is sequentially communicated with a fourth valve (11) and a fourth circulating water pump (12) through connecting pipes; the outlet of the fourth circulating water pump (12) is divided into four paths, and the first path is sequentially communicated with the fifth valve (13) and the hot side inlet of the seasonal heat storage buried pipe device (14) through a connecting pipe; the second path is communicated with a second valve (8) and a hot side inlet of the solar heat storage hot water heat storage tank (6) in sequence through a connecting pipe; the third path is communicated with a tenth valve (22) and an inlet of a heating user (30) in sequence through a connecting pipe; the fourth path is communicated with an eighth valve (18), a sixth circulating water pump (19) and an inlet of an absorption refrigerator (21) in sequence through connecting pipes; the outlet of the cold side of the heat-storage hot water heat storage tank (6) in the day is communicated with the inlet of the cold side of the second heat exchanger (5) through a first valve (7), and the outlet of the hot side of the heat-storage hot water heat storage tank (6) in the day is communicated with the inlet of a heating user (30) through a third valve (10) and a third circulating water pump (9);
an outlet of a heating heat user (30) and an outlet of the absorption refrigerator (21) are respectively communicated with cold side backwater of the three loops through an eleventh valve (23) and a ninth valve (20); the cold-side backwater of the three loops is divided into four loops, and the first loop is sequentially communicated with a twelfth valve (25) and a cold-side inlet of a gas boiler (27) through a connecting pipe; the second path is communicated with a first valve (7) and a cold side inlet of the heat storage hot water and heat storage tank (6) in the day through a connecting pipe in sequence; the third path is communicated with a seventh valve (17) and a cold side inlet of the season-crossing heat storage buried pipe device (14) in sequence through a connecting pipe; the fourth path is communicated with a cold side inlet of a second heat exchanger (5) through a connecting pipe; the hot side outlet of the seasonal heat storage buried pipe device (14) is communicated with the hot side water supply of the three loops through a sixth valve (15) and a fifth circulating water pump (16) in sequence; a cold side outlet of the gas boiler (27) is communicated with hot side water supply of the three loops through a thirteenth valve (26) and a seventh circulating water pump (24) in sequence; the smoke outlet of the gas boiler (27) is communicated with a smoke type ground source absorption heat pump (29).
2. The heat supply pile cold and heat cogeneration system with heat storage and peak shaving functions as claimed in claim 1, wherein when heat storage is performed on the hot-water heat storage tank (6) in the day, hot water at the outlet of the fourth circulating water pump (12) enters the inlet at the hot side of the hot-water heat storage tank (6) in the day through the second valve (8) to store heat, and meanwhile, cold water with the same volume at the outlet at the cold side of the hot-water heat storage tank (6) in the day flows out of the hot-water heat storage tank (6) in the day through the first valve (7) and then flows to the inlet at the cold side of the second heat exchanger (5); when releasing heat to hot water heat storage tank (6) of storing heat in the day, the hot water that hot water heat storage tank (6) of storing heat in the day loops through third valve (10), third circulating water pump (9) and three return circuits hot side supplies water and joins, then carries the user side to release heat, realizes heat supply or cooling, and three return circuits cold side backwater have equal volumetric cold water to return to hot water heat storage tank (6) of storing heat in the day cold side entry through first valve (7) simultaneously.
3. The combined cooling and heating system with the functions of heat storage and peak regulation according to claim 1, characterized in that when the seasonal heat storage buried pipe device (14) is used for heat storage, hot water at the outlet of the fourth circulating water pump (12) enters the seasonal heat storage buried pipe device (14) through the fifth valve (13) to exchange heat with soil, so that heat is stored in the soil around the buried pipe, and then the cold water with heat released returns to the cold water side of the three loops through the seventh valve (17); when the cross-season heat storage buried pipe device (14) is used for releasing heat, the cold-side backwater of the three loops enters the cross-season heat storage buried pipe device (14) through the seventh valve (17) to absorb heat and raise the temperature, and then is communicated with the hot-side water supply of the three loops through the sixth valve (15) and the fifth circulating water pump (16) in sequence, and then heat supply or cold supply is carried out.
4. The heat supply pile cold and heat cogeneration system with heat storage and peak regulation functions as claimed in claim 1, wherein the return water at the cold side of the three loops enters a gas boiler (27) through a twelfth valve (25) to be heated, the heated hot water is communicated with the water supply at the hot side of the three loops through a thirteenth valve (26) and a seventh circulating water pump (24) in sequence, and then heat supply or cold supply is carried out, and meanwhile, the cold water with the same volume at the cold side of the three loops returns to the gas boiler (27) through the twelfth valve (25); on the other hand, the temperature of the flue gas generated by the gas boiler (27) reaches 120-180 ℃, and the residual heat is used for driving the flue gas type ground source absorption heat pump (29) to prepare medium-low temperature hot water meeting the living requirements.
5. The operation method of the heat supply pile cold and heat cogeneration system with the heat storage and peak shaving functions as claimed in any one of claims 1 to 4, characterized in that in the non-heating season and the non-cooling season, the fourth valve (11), the fifth valve (13), the seventh valve (17) and the fourth circulating water pump (12) are opened, hot side water supply of the low-temperature heat supply pile three loop enters the seasonal heat storage buried pipe device (14) through the fourth valve (11), the fourth circulating water pump (12) and the fifth valve (13) in sequence, all heat is stored in the soil around the seasonal heat storage buried pipe device (14), and cold water with heat released returns to the cold water side of the three loops through the seventh valve (17);
in the early and late stages of cooling in summer, when the cooling load is low, the cooling load requirement of a user end can be met by partial power operation of the low-temperature heat supply reactor, and at the moment, peak shaving cooling in the day is only needed; when the cold load is low at night, a first valve (7), a second valve (8), a fourth valve (11), an eighth valve (18) and a ninth valve (20) are opened, a fourth circulating water pump (12) and a sixth circulating water pump (19) are opened, hot side water supply of the three loops is divided into two paths, one path flows to a day heat storage hot water heat storage tank (6) for heat storage, and the other path flows to an absorption refrigerator (21) for refrigeration; when the cold load is high in the daytime, a first valve (7), a third valve (10), a fourth valve (11), an eighth valve (18) and a ninth valve (20) are opened, a second valve (8) is closed, a third circulating water pump (9), a fourth circulating water pump (12) and a sixth circulating water pump (19) are started, the hot water stored in the hot water storage and heat storage tank (6) in the daytime is converged with the hot water supplied by the hot side of the three loops, and the converged hot water is supplied to an absorption refrigerator (21) for refrigeration;
in the summer cooling peak period, when the full load operation of the heat supply pile can not meet the cooling load demand of a user terminal, cross-season peak regulation and in-day peak regulation are simultaneously carried out according to the cooling load demand of the user in different periods of the cooling season; when the cold load is low at night, a first valve (7), a second valve (8), a fourth valve (11), a sixth valve (15), a seventh valve (17), an eighth valve (18) and a ninth valve (20) are opened, a fourth circulating water pump (12), a fifth circulating water pump (16) and a sixth circulating water pump (19) are opened, heat is stored in the heat storage hot water heat storage tank (6) in the day, and heat is released by the seasonal heat storage buried pipe device (14); when the cold load is high in the daytime, a first valve (7), a third valve (10), a fourth valve (11), a sixth valve (15), a seventh valve (17), an eighth valve (18) and a ninth valve (20) are opened, a third circulating water pump (9), a fourth circulating water pump (12), a fifth circulating water pump (16) and a sixth circulating water pump (19) are started, the hot water stored in the solar heat storage hot water heat storage tank (6) and the hot water which absorbs the soil heat stored in the soil in the cross-season heat storage buried pipe device (14) are converged with the hot water of the three loops, and the converged hot water is supplied to an absorption type refrigerating machine (21) for refrigeration, so that the solar peak regulation and the cross-season peak regulation of the system cold supply are realized;
in the early and late stages of heat supply in winter, when the heat supply load is low, the heat supply pile can meet the heat load demand of a user end only by partial power operation, and at the moment, peak shaving heat supply in the day is needed; when the heat load is low in the daytime, a first valve (7), a second valve (8), a fourth valve (11), a tenth valve (22) and an eleventh valve (23) are opened, a fourth circulating water pump (12) is started, water supply at the hot side of the three loops is divided into two paths, one path flows to a heat storage hot water heat storage tank (6) in the daytime for heat storage, and the other path flows to a heating user (30) for heat supply; when the heat load is high at night, a first valve (7), a third valve (10), a fourth valve (11), a tenth valve (22) and an eleventh valve (23) are opened, a second valve (8) is closed, a third circulating water pump (9) and a fourth circulating water pump (12) are started, the hot water stored in the heat storage hot water heat storage tank (6) in the day is converged with the hot water supplied by the hot sides of the three loops, and the converged hot water is supplied to a heating user (30) for heat supply;
in the winter heat supply peak period, when the full load operation of the heat supply pile can not meet the cold load demand of a user terminal, cross-season peak regulation and intra-day peak regulation are simultaneously carried out according to the actual heat load demand of the user; when the heat load is low in the daytime, a first valve (7), a second valve (8), a fourth valve (11), a sixth valve (15), a seventh valve (17), a tenth valve (22) and an eleventh valve (23) are opened, a fourth circulating water pump (12) and a fifth circulating water pump (16) are opened, the heat storage hot water heat storage tank (6) stores heat in the day, and the heat storage buried pipe device (14) strides seasons stores heat to release heat; when the demand of heat load is high at night, a first valve (7), a third valve (10), a fourth valve (11), a sixth valve (15), a seventh valve (17), a tenth valve (22) and an eleventh valve (23) are opened, a third circulating water pump (9), a fourth circulating water pump (12) and a fifth circulating water pump (16) are started, the hot water stored in the solar heat storage hot water heat storage tank (6) and the hot water which absorbs the soil heat in the cross-season heat storage buried pipe device (14) are converged with the hot water on the water supply side of the three loops, the converged hot water is supplied to a heating user (30) for heating, and meanwhile, the solar heat supply peak regulation and the cross-season heat supply peak regulation are realized;
when the gas-fired boiler is used for peak regulation, the return water at the cold side of the three loops enters the gas-fired boiler (27) through the twelfth valve (25) for heating and temperature rise, then is supplied with water to join with the hot side of the three loops through the thirteenth valve (26) and the seventh circulating water pump (24) in sequence, and then is used for heat supply or cold supply; in addition, the flue gas waste heat of the gas-fired boiler can still be used for driving a ground source absorption heat pump to supply hot water for users, so that the energy gradient utilization is realized.
6. The constant volume optimization method of the heat supply reactor cold and hot combined supply system with the heat storage and peak regulation functions as claimed in any one of claims 1 to 4, characterized in that according to each user type of the heat supply and cold supply area, the daily and hourly cold and hot load change characteristics under the statistical rule are obtained by combining the meteorological data of the area where the user is located; according to the obtained change characteristics of the cold and hot loads of the user, the capacity of each device of the system is preliminarily configured; on the premise of the initial investment cost and the operation and maintenance cost of each device of the known low-temperature heat supply reactor (1), the solar heat storage hot water heat storage tank (6), the seasonal heat storage buried pipe device (14), the gas boiler (27) and the absorption refrigerator (21), the whole system is optimized and analyzed by combining an annual cost method and various economic evaluation indexes in a dynamic investment recovery period, so that a system configuration scheme with the best economy is obtained.
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| CN115727384B (en) * | 2022-11-07 | 2024-02-06 | 华电电力科学研究院有限公司 | Heating system for realizing peak shaving and cross-season heat storage of thermoelectric unit and operation method |
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| CN104697238B (en) * | 2015-02-12 | 2017-01-11 | 清华大学 | Energy storage type thermoelectric combined cooling and power device suitable for active power distribution network and running method of energy storage type thermoelectric combined cooling and power device |
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