CN107764122B - Large-temperature-difference cold water combined type cascade utilization system based on waste heat utilization - Google Patents
Large-temperature-difference cold water combined type cascade utilization system based on waste heat utilization Download PDFInfo
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- CN107764122B CN107764122B CN201711160739.9A CN201711160739A CN107764122B CN 107764122 B CN107764122 B CN 107764122B CN 201711160739 A CN201711160739 A CN 201711160739A CN 107764122 B CN107764122 B CN 107764122B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0012—Recuperative heat exchangers the heat being recuperated from waste water or from condensates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
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Abstract
The invention discloses a large-temperature-difference cold water composite cascade utilization system based on waste heat utilization, which comprises a waste heat absorption type large-temperature-difference cascade refrigeration system, a chilled water cascade utilization system, a cooling water cascade utilization system and a regional cooling user system, wherein the waste heat absorption type large-temperature-difference cascade refrigeration system supplies cold water to the chilled water cascade utilization system through a pipeline, the chilled water cascade utilization system supplies cold water to the cooling water cascade utilization system through a pipeline, the cooling water cascade utilization system supplies cold water to the regional cooling user system, and hot water of the cooling water cascade utilization system flows back to the waste heat absorption type large-temperature-difference cascade refrigeration system for cooling. The invention utilizes the waste heat of the thermal power plant to carry out absorption refrigeration, realizes the cascade utilization of the waste heat and the waste heat, improves the primary energy utilization rate, improves the return water temperature, increases the return water temperature difference of the regional cooling system, enlarges the cold water use temperature difference, greatly reduces the cold water circulation quantity, reduces the pipe network conveying energy consumption and the cold loss, and reduces the cold water pipe network conveying energy consumption.
Description
Technical Field
The invention relates to the technical field of cold water supply cascade and waste heat utilization, in particular to a large-temperature-difference cold water compound cascade utilization system based on waste heat utilization.
Background
With the popularization and application of energy efficient utilization technologies such as cogeneration, combined cooling, heating and power supply, distributed energy and the like, the waste heat utilization technology is an important ring in energy efficient utilization and cascade utilization, and is greatly developed. Waste heat utilization is usually carried out by taking waste heat steam, flue gas tail gas and the like of a thermal power plant as heat sources and driving an absorption lithium bromide water chiller to prepare low-temperature chilled water for cooling. In the prior art, when the waste heat utilization is applied to a regional cooling system, as the common absorption chiller can only prepare chilled water with the temperature of more than 6 ℃, in order to meet the large temperature difference cooling requirement of regional cooling, the method of serially connecting an electric refrigerator or ice cold storage at the downstream of the absorption refrigerator is adopted to reduce the water supply temperature and enlarge the temperature difference of regional cooling water supply and return water.
The method for reducing the water supply temperature by adopting the serial scheme to enlarge the temperature difference of the water supply and return has the following problems: firstly, the outlet water temperature of the absorber at 6 ℃ is relatively low, and the outlet water temperature reduction space of a downstream electric refrigerating unit is limited; secondly, the efficiency of the electric refrigerating unit is sharply reduced under the ultralow temperature working condition, the energy-saving effect is poor, and the energy-saving target is deviated; again, the chilled water will have an impact on the heat exchange capacity of the consumer end device.
In general, the thermal power plant is located far from the regional refrigeration station, and the waste heat steam is usually conveyed to the regional refrigeration station through a steam pipeline. However, if the waste heat is transported far, the waste heat is more lost, and is not beneficial to being transported to an excessively far area, so that the application range is limited.
Disclosure of Invention
The invention aims at the defects existing in the prior art, and provides a large-temperature-difference cold water compound cascade utilization system based on waste heat utilization; the invention utilizes the waste heat of the thermal power plant to carry out absorption refrigeration, realizes the cascade utilization of the waste heat and the waste heat, and improves the utilization rate of primary energy. By adopting a compound cascade utilization mode of multistage chilled water connected in series with multistage cooling water, the return water temperature is increased, the return water temperature difference of the regional cooling system is increased, the cold water use temperature difference range is enlarged, the cold water circulating water quantity is greatly reduced, the investment of a pipe network and a secondary pump is remarkably saved, the conveying energy consumption and the pipe network cold loss are obviously reduced, and the primary investment of the system is further reduced by high-temperature return water.
The technical scheme for solving the technical problems is as follows:
a large-temperature-difference cold water composite cascade utilization system based on waste heat utilization comprises a waste heat absorption type large-temperature-difference cascade refrigeration system, a chilled water cascade utilization system, a cooling water cascade utilization system and a regional cooling user system. The waste heat absorption type large-temperature-difference cascade refrigerating system supplies cold water to the chilled water cascade utilizing system through a pipeline, the chilled water cascade utilizing system supplies cold water to the cooling water cascade utilizing system through a pipeline, the cooling water cascade utilizing system supplies cold water to the regional cooling user system, and hot water of the cooling water cascade utilizing system flows back to the waste heat absorption type large-temperature-difference cascade refrigerating system to be cooled.
The waste heat absorption type large-temperature-difference cascade refrigerating system comprises two groups of waste heat absorption type water chilling units, two absorber chilled water primary pumps, two absorber cooling water pumps, one absorber chilled water secondary pump and an absorber cooling tower. The water inlet end of the first cooling water pump of the absorber is connected with the water outlet of the cooling tower of the absorber through a pipeline, the water outlet end of the first cooling water pump of the absorber is connected with the water inlet of the first cold side of the waste heat absorption water chilling unit through a pipeline, and the water outlet of the first cold side of the waste heat absorption water chilling unit is connected with the cooling tower of the absorber through a water return pipeline; the water inlet end of the second cooling water pump of the absorber is connected with the water outlet of the cooling tower of the absorber through a pipeline, the water outlet end of the second cooling water pump of the absorber is connected with the water inlet of the second cold side of the residual heat absorption type water chilling unit through a pipeline, and the water outlet of the second cold side of the residual heat absorption type water chilling unit is connected with the cooling tower of the absorber through a water return pipeline.
The chilled water cascade utilization system comprises two groups of user plate exchangers and two user chilled water circulating pumps. The water inlet of the first cold side of the user board is connected with the water outlet of the first hot side of the waste heat absorption water chilling unit through a pipeline and an absorber chilled water secondary pump on the pipeline, and the water outlet of the first cold side of the user board is connected with the water inlet of the second cold side of the other user board through a pipeline; and the water outlet of the second cold side of the user board is connected with the water inlet of the first cold side of the electric refrigeration chiller through a cooling water pump of the electric refrigeration chiller on the pipeline and the cooling water cascade utilization system.
The cooling water cascade utilization system comprises two groups of electric refrigerating water chilling units, two electric refrigerating unit chilled water primary pumps, two electric refrigerating unit cooling water pumps and one electric refrigerating unit chilled water secondary pump. The electric refrigeration water chilling unit comprises an electric refrigeration water chilling unit I and an electric refrigeration water chilling unit II; the electric refrigerating unit chilled water primary pump comprises an electric refrigerating unit chilled water primary pump I and an electric refrigerating unit chilled water primary pump II; the electric refrigerating unit cooling water pump comprises an electric refrigerating unit cooling water pump I and an electric refrigerating unit cooling water pump II, a cold side water outlet of the electric refrigerating water unit I is connected with a cold side water inlet of the electric refrigerating water unit II through a pipeline and the electric refrigerating unit cooling water pump II, a cold side water outlet of the electric refrigerating water unit II is connected with a water inlet of a hot side of the waste heat absorption water unit II through a pipeline and an absorber chilled water primary pump on the pipeline, and a water outlet of the hot side of the waste heat absorption water unit II is connected with a water inlet of the hot side of the waste heat absorption water unit I through a pipeline and an absorber chilled water primary pump on the pipeline;
the regional cooling user comprises two user board exchangers and a user chilled water circulating pump, wherein a cold side water inlet of the user board exchanger of the regional cooling user is connected with a water outlet of the hot side of the first electric refrigerating chiller of the cooling water cascade utilization system through a pipeline chilled water secondary pump, a three-way valve and a chilled water primary pump, or is connected with a water outlet of the hot side of the second electric refrigerating chiller through a three-way valve, a pipeline and a chilled water primary pump between the chilled water secondary pump and the chilled water primary pump; the cold side water outlet of the user board is connected with the hot side water inlet of the first electric refrigeration chiller through a pipeline and a three-way valve, or is connected with the hot side water inlet of the second electric refrigeration chiller through a three-way valve on the pipeline; the cold side water inlet of the user board II is connected to the cold side water inlet pipeline of the user board II through a pipeline; and the cold side water outlet of the user board exchange is connected to the cold side outlet pipeline of the user board exchange through a pipeline.
The temperature of the water outlet of the waste heat absorption type large-temperature difference cascade refrigerating system 1 is 6 ℃, and the temperature of the hot water flowing back to the waste heat absorption type large-temperature difference cascade refrigerating system 1 is 32-37 ℃.
The invention has the beneficial effects that:
1. the large-temperature-difference cold water composite cascade utilization system utilizes the waste heat of the thermal power plant to perform absorption refrigeration, realizes cascade utilization of the waste heat and the waste heat, and improves the utilization rate of primary energy. The temperature of the outlet water after being cooled by the cooling tower of the absorber is kept to be output outwards at 6 ℃, the return water temperature is improved, the temperature difference of the return water supplied by the regional cooling system is increased, the temperature difference range of cold water is enlarged, the circulating water quantity of the cold water is greatly reduced, and the energy consumption and the cold loss of pipe network transportation are reduced by adopting a compound cascade utilization mode of multi-stage chilled water connected in series with multi-stage cooling water; the invention utilizes the chilled water and the cooling water in a combined way, and can improve the return water temperature of the common chilled water in the prior art from 12 ℃ to 14 ℃ to the return water temperature of 32 ℃ to 37 ℃ which is commonly used for the cooling water. The original temperature difference of 6-8 ℃ is increased to 26-31 ℃. The greatly reduced water delivery amount can obviously reduce the energy consumption of cold water pipe network delivery, and save the investment of pipe network and secondary pump. Meanwhile, the higher temperature of the water supply and return reduces the cold loss of a conveying pipe network, and the heat preservation of the high-temperature water return can be canceled, so that the initial investment of the system is further reduced.
2. The invention can realize the on-site waste heat absorption refrigeration of the thermal power plant, and can directly convey the chilled water to users for multi-stage cooling. And (3) conveying the chilled water after the multi-stage use to an area cooling station by using the returned water at the high temperature of about 20 ℃ as cooling water of an electric refrigerating unit for multi-stage use, conveying the cooling water after the multi-stage use to a regenerative power plant, and continuing to perform waste heat absorption refrigeration after cooling treatment. The refrigeration scheme adopts a large-temperature-difference gradient refrigeration mode to finish cyclic use.
3. The invention reduces the design difficulty of the terminal of the user by adopting the chilled water supply temperature close to the normal working condition. The multistage freezing water classified according to the temperature difference can meet the requirement of a user for removing the sensible heat load of the air conditioner; the cooling water used in the grading according to the temperature difference at about 20 ℃ can obviously improve the performance of the electric refrigerating unit. The waste heat refrigerating system positioned in the thermal power plant and the electric refrigerating and cooling system positioned in the regional load center can reduce regional cooling and conveying energy consumption, enlarge cooling radius and application range, and fully utilize preheating.
4. The invention adopts a large-temperature difference cold water compound cascade utilization system to realize the compound cascade utilization of the chilled water and the cooling water, cancels a regional energy station cooling tower, improves the energy efficiency, reduces the environmental factors such as occupation of land, urban noise, heat island effect, sewage drifting and the like, and improves the regional life quality.
5. The invention adopts a large-temperature-difference cold water compound cascade utilization system, and chilled water is subjected to cascade utilization according to the principle of temperature opposite to mouth, thereby providing a foundation and a precondition for new air conditioning technologies such as independent temperature and humidity control.
6. The invention adopts a large-temperature-difference cold water composite cascade utilization system, reduces the temperature of cooling water of the electric refrigerating unit, improves the temperature of chilled water of the absorption type cold water unit, and improves the running efficiency of the refrigerating unit.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
Detailed Description
For a better understanding of the present invention, embodiments of the present invention are explained in detail below with reference to the drawings.
Referring to fig. 1, a large-temperature-difference cold water composite cascade utilization system based on waste heat utilization comprises a waste heat absorption type large-temperature-difference cascade refrigeration system 1, a chilled water cascade utilization system 3, a cooling water cascade utilization system 2 and a regional cooling user system 4.
The waste heat absorption type large-temperature-difference cascade refrigeration system 1 supplies cold water to the chilled water cascade utilization system 3 through a pipeline, the chilled water cascade utilization system 3 supplies cold water to the cooling water cascade utilization system 2 through a pipeline, and the cooling water cascade utilization system 2 supplies cold water to the regional cooling user system 4.
The hot water of the cooling water cascade utilization system 2 flows back to the waste heat absorption type large-temperature difference cascade refrigeration system 1 for cooling. The temperature of the water outlet of the waste heat absorption type large-temperature difference cascade refrigerating system 1 is 6 ℃, and the temperature of the hot water flowing back to the waste heat absorption type large-temperature difference cascade refrigerating system 1 is 32-37 ℃. The absorption refrigerating unit adopts a mode of preparing cold water in series, the absorption refrigerating unit at the side of the thermal power plant can process backwater at 37 ℃ to the temperature of 5.5-6 ℃ of water outlet, then the cold energy is released in a frozen water cascade utilization system, the temperature is raised to the temperature when the water cannot be used as frozen water, the water enters a condenser of an electric refrigerating chiller, the temperature of conventional cooling water at the condenser side of the electric refrigerating unit is 30/35 ℃, or 32/37 ℃ and the like, the lower the temperature of the cooling water is, the higher the energy efficiency of the unit is, and when the temperature of the cooling water is lower than a certain degree, certain regulation measures can be adopted for the water supply temperature of the cooling water to ensure the normal operation of the unit. Therefore, the temperature of the water supply and return of the absorption refrigerating unit can be 6/37 ℃ through the mutual coupling of the cascade utilization system and the absorption refrigerating unit.
The method comprises the following steps: the waste heat absorption type large-temperature-difference cascade refrigerating system 1 comprises two groups of waste heat absorption type water chilling units 11 and 111, two absorber chilled water primary pumps 12 and 121, two absorber cooling water pumps 13 and 131, one absorber chilled water secondary pump 14 and an absorber cooling tower 15. The water inlet end of the first cooling water pump 131 of the absorber is connected with the water outlet of the cooling tower 15 of the absorber through a pipeline; the water outlet end of the first cooling water pump 131 of the absorber is connected with the water inlet of the cold side of the first waste heat absorption chiller 111 through a pipeline; the water outlet of the cold side of the waste heat absorption type water chilling unit I111 is connected with the absorber cooling tower 15 through a water return pipeline. The water inlet end of the second cooling water pump 132 of the absorber is connected with the water outlet of the cooling tower 15 of the absorber through a pipeline; the water outlet end of the second cooling water pump 132 of the absorber is connected with the water inlet of the cold side of the second waste heat absorption chiller unit 11 through a pipeline; the water outlet of the cold side of the second waste heat absorption chiller unit 11 is connected with the water inlet of the absorber cooling tower 15 through a water return pipeline.
The method comprises the following steps: chilled water cascade utilization system 3 includes two sets of user plate switches 31 (specifically user plate switches 311 and 312), and two user chilled water circulation pumps 32 (specifically chilled water circulation pumps 321 and 322). The water inlet at the cold side of one group of user boards 311 is connected with the water outlet at the cold side of the first 111 of the waste heat absorption chiller, through a pipeline and the chilled water secondary pump 14 of the absorber on the pipeline; the first user board exchange 311 cold side water outlet is connected with the second user board exchange 312 cold side water inlets of the other group through pipelines; the second user board is replaced by 312 with a cold side water outlet, and is connected with a cold side water inlet of the first electric refrigerating chiller 211 through a pipeline and a first cooling water pump 232 in front of the electric chiller on the cooling water cascade utilization system 2.
The method comprises the following steps: the cooling water cascade utilization system 2 comprises two groups of electric refrigeration chiller units 21 (specifically electric refrigeration chiller units 211 and 212), two electric refrigeration chiller unit chilled water primary pumps 22 (specifically electric refrigeration chiller unit chilled water primary pumps 221 and 222), two electric refrigeration chiller unit cooling water pumps 23 (specifically electric refrigeration chiller unit cooling water pumps 232 and 231), and one electric refrigeration chiller unit chilled water secondary pump 24. The electric refrigeration water chilling unit 21 comprises an electric refrigeration water chilling unit I211 and an electric refrigeration water chilling unit II 212; the electric refrigerating unit chilled water primary pump 22 comprises an electric refrigerating unit chilled water primary pump 221 and an electric refrigerating unit chilled water primary pump 222; the electric refrigerating unit cooling water pump 23 comprises an electric refrigerating unit cooling water pump I232 and an electric refrigerating unit cooling water pump II 231; the cold side water outlet of the first electric refrigeration chiller 211 is connected with the cold side water inlet of the second electric refrigeration chiller 212 through a pipeline and a second electric refrigeration chiller cooling water pump 231; the cold side water outlet of the second electric refrigeration chiller 212 is connected with the water inlet of the hot side of the second residual heat absorption chiller 112 through the second chilled water primary pump 122 of the absorber on the pipeline; the water outlet on the hot side of the second waste heat absorption water chiller 112 is connected with the water inlet on the hot side of the first waste heat absorption water chiller 111 through a pipeline and an absorber chilled water primary pump 121 on the pipeline.
The district cooling user comprises two user plate switches 41 (user plate switches 412 and 411 in particular) and user chilled water circulation pumps 42 (user chilled water circulation pumps 422 and 421 in particular). The cold side water inlet of the user board exchange 412 of the regional cooling user is connected with the water outlet of the hot side of the first electric refrigeration chiller unit 211 of the cooling water cascade utilization system 2 through a pipeline chilled water secondary pump 24, a three-way valve and a chilled water primary pump 221, or is connected with the water outlet of the hot side of the second electric refrigeration chiller unit 212 through a three-way valve, a pipeline and a chilled water primary pump 222 between the chilled water secondary pump 24 and the chilled water primary pump 221; the cold side water outlet of the user board I412 is connected with the hot side water inlet of the first electric refrigeration chiller 211 through a pipeline and a three-way valve, or is connected with the hot side water inlet of the second electric refrigeration chiller 212 through a three-way valve on the pipeline. The cold side water inlet of the user board exchange II 411 is connected to the cold side water inlet pipeline of the user board exchange II 412 through a pipeline; the cold side water outlet of the customer board exchange 411 is connected to the cold side outlet line of the customer board exchange 412 by a pipe.
The waste heat absorption type large temperature difference refrigerating host arranged in the thermal power plant returns backwater with the water temperature of about 32-37 ℃ to the absorber cooling tower 15 through a conveying pipe network after the cascade utilization system is used, and the cascade utilization system is used for refrigerating by multistage serial large temperature difference (generally two stages are connected in series, so that the refrigerating temperature difference of the unit is improved to reduce the serial series stage number). Cooling the cold water to about 6 ℃ step by step, and conveying the cold water serving as regional cooling low-temperature chilled water to a cooling user through a conveying pipe network.
The cold user uses a chilled water cascade utilization scheme according to the regional cooling large temperature difference requirement, the chilled water cascade utilization scheme comprises a fresh air unit series fan coil cascade utilization scheme based on independent control of temperature and humidity, a low-temperature coil series medium-temperature coil cascade utilization scheme and the like, the chilled water supply and return water temperature difference of the chilled water cascade utilization system 3 is increased to be more than 8-14 ℃ from 5 ℃ of a conventional air conditioning system and is conveyed to a regional cooling station electric refrigerating machine room, the chilled water quantity is greatly reduced, the chilled water utilization efficiency is improved, and the conveying energy consumption of a chilled water pump is reduced.
The high-temperature chilled water (about 14-20 ℃) after cascade utilization of users is used as high-quality low-temperature cooling water cascade of the cooling water cascade utilization system 2, and the cooling electric refrigerating unit is used for refrigerating and providing low-temperature chilled water for the users. Because the cooling water temperature is lower, the cooling water cascade use scheme can adopt the big difference in temperature utilization system (generally two-stage series connection, promote the unit cooling water difference in temperature in order to reduce series connection series number) equally, reduce cooling water flow under the same refrigerating capacity, promote cooling water utilization efficiency, reduce cooling water pump energy consumption. And (3) transferring the cooling water subjected to cascade utilization to the temperature of between 32 and 37 ℃ again to a regenerative power plant for waste heat absorption refrigeration.
The large-temperature-difference cold water composite cascade utilization system based on waste heat utilization can raise the temperature difference of cold water supply and return water of a regional cold supply system from conventional 6-8 ℃ to about 26-30 ℃, greatly improve the cold water utilization efficiency and reduce the energy consumption of the circulating water pump for conveying; meanwhile, low-temperature cold water is used for replacing a cooling tower of the electric refrigeration host, so that the efficiency of the electric refrigeration host is improved, noise and thermal environmental influence are eliminated, and the electric refrigeration host is energy-saving and environment-friendly. The lower cooling water temperature and the higher freezing water temperature can compensate the performance reduction of the unit caused by the design of large temperature difference to a certain extent, thereby improving the operation efficiency of the whole cascade utilization system.
While embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (1)
1. The large-temperature-difference cold water composite cascade utilization system based on waste heat utilization is characterized by comprising a waste heat absorption type large-temperature-difference cascade refrigeration system, a chilled water cascade utilization system, a regional cooling user system, wherein the waste heat absorption type large-temperature-difference cascade refrigeration system supplies cold water to the chilled water cascade utilization system through a pipeline, the chilled water cascade utilization system supplies cold water to the regional cooling user system, and hot water of the chilled water cascade utilization system flows back to the waste heat absorption type large-temperature-difference cascade refrigeration system for cooling;
the waste heat absorption type large-temperature-difference cascade refrigerating system comprises two groups of waste heat absorption type water chilling units, two absorber chilled water primary pumps, two absorber cooling water pumps, one absorber chilled water secondary pump and an absorber cooling tower; the water inlet end of the first cooling water pump of the absorber is connected with the water outlet of the cooling tower of the absorber through a pipeline, the water outlet end of the first cooling water pump of the absorber is connected with the water inlet of the first cold side of the waste heat absorption water chilling unit through a pipeline, and the water outlet of the first cold side of the waste heat absorption water chilling unit is connected with the cooling tower of the absorber through a water return pipeline; the water inlet end of the second cooling water pump of the absorber is connected with the water outlet of the cooling tower of the absorber through a pipeline, the water outlet end of the second cooling water pump of the absorber is connected with the water inlet of the second cold side of the residual heat absorption type water chilling unit through a pipeline, and the water outlet of the second cold side of the residual heat absorption type water chilling unit is connected with the cooling tower of the absorber through a water return pipeline; the chilled water cascade utilization system comprises two groups of user board exchange and two user chilled water circulating pumps, wherein a water inlet of a first chilled side of one group of user board exchange is connected with a water outlet of a first hot side of the waste heat absorption chiller through a pipeline and an absorber chilled water secondary pump on the pipeline, a water outlet of the first chilled side of the user board exchange is connected with a water inlet of a second chilled side of the other group of user board exchange through a pipeline, and a water outlet of the second chilled side of the user board exchange is connected with a water inlet of the first chilled side of the electric chiller through a pipeline and a cooling water pump of the electric chiller on the cooling water cascade utilization system; the cooling water cascade utilization system comprises two groups of electric refrigeration water chilling units, two electric refrigeration unit chilled water primary pumps, two electric refrigeration unit cooling water pumps and one electric refrigeration unit chilled water secondary pump, wherein the electric refrigeration water chilling units comprise an electric refrigeration water chilling unit I and an electric refrigeration water chilling unit II, the electric refrigeration unit chilled water primary pumps comprise an electric refrigeration unit chilled water primary pump I and an electric refrigeration unit chilled water primary pump II, the electric refrigeration unit cooling water pumps comprise an electric refrigeration unit cooling water pump I and an electric refrigeration unit cooling water pump II, a cold side water outlet of the electric refrigeration water chilling unit I is connected with a cold side water inlet of the electric refrigeration water chilling unit II through a pipeline and the electric refrigeration unit cooling water pump II, a cold side water outlet of the electric refrigeration water chilling unit II is connected with a water inlet of a waste heat absorption type water chilling unit II hot side through a pipeline and an absorber chilled water pump I on the pipeline, and a waste heat absorption type water chilling unit II hot side water inlet is connected with the waste heat absorption type water chilling unit I; the regional cooling user comprises two user board exchangers and a user chilled water circulating pump, wherein a cold side water inlet of the user board exchanger of the regional cooling user is connected with a water outlet of the hot side of the first electric refrigerating chiller of the cooling water cascade utilization system through a pipeline chilled water secondary pump, a three-way valve and a chilled water primary pump, or is connected with a water outlet of the hot side of the second electric refrigerating chiller through a three-way valve, a pipeline and a chilled water primary pump between the chilled water secondary pump and the chilled water primary pump; the cold side water outlet of the user board is connected with the hot side water inlet of the first electric refrigeration chiller through a pipeline and a three-way valve, or is connected with the hot side water inlet of the second electric refrigeration chiller through a three-way valve on the pipeline; the cold side water inlet of the user board II is connected to the cold side water inlet pipeline of the user board II through a pipeline; the cold side water outlet of the user board II is connected to the cold side outlet pipeline of the user board II through a pipeline;
the outlet water temperature of the waste heat absorption type large-temperature difference cascade refrigerating system is 6 ℃, and the temperature of hot water flowing back to the waste heat absorption type large-temperature difference cascade refrigerating system is 32-37 ℃.
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| CN107894051B (en) * | 2017-12-15 | 2023-11-24 | 华南理工大学建筑设计研究院有限公司 | Regional energy station cooling center transferring and cascade utilization system based on waste heat refrigeration |
| CN112797522A (en) * | 2020-12-31 | 2021-05-14 | 珠海横琴能源发展有限公司 | Large-temperature-difference refrigeration system for centralized energy station |
| CN117490203A (en) * | 2023-12-28 | 2024-02-02 | 珠海格力电器股份有限公司 | Control method and device of air conditioning system, air conditioning system and storage medium |
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