CN115949983A - Heat pump cold and heat combined supply system for central heating station - Google Patents
Heat pump cold and heat combined supply system for central heating station Download PDFInfo
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- CN115949983A CN115949983A CN202310003749.0A CN202310003749A CN115949983A CN 115949983 A CN115949983 A CN 115949983A CN 202310003749 A CN202310003749 A CN 202310003749A CN 115949983 A CN115949983 A CN 115949983A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 328
- 238000010521 absorption reaction Methods 0.000 claims abstract description 87
- 238000005338 heat storage Methods 0.000 claims abstract description 63
- 239000006096 absorbing agent Substances 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 14
- 239000008399 tap water Substances 0.000 claims description 13
- 235000020679 tap water Nutrition 0.000 claims description 13
- 230000005494 condensation Effects 0.000 abstract description 6
- 238000009833 condensation Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000013589 supplement Substances 0.000 abstract description 4
- 238000009825 accumulation Methods 0.000 description 22
- 239000007789 gas Substances 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- 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]
- Y02B30/12—Hot water central heating systems using heat pumps
Abstract
The invention discloses a heat pump cold and hot combined supply system for a central heating station, which comprises: the system comprises a primary pipe network, a secondary pipe network, a water source heat pump, a hot water type absorption refrigerating unit, a heat exchanger, a heat storage tank and a cold storage tank, wherein the absorption refrigerating unit is driven by the primary pipe network to supply cold in winter, and the absorption heat and the condensation heat of the water source heat pump and the absorption refrigerating unit are used for supplying heat to a secondary side; in summer, the water source heat pump and the absorption refrigerating unit are used for refrigerating, and the condensation heat and the absorption heat are recovered and used for supplying domestic hot water. The technology can simultaneously supply cold and supplement heat in winter and supply cold and provide domestic hot water in summer, organically combines the original device of the heating power station, the primary pipe network, the secondary pipe network and the heat pump unit, realizes the maximum application of energy generated by the heat pump, and simultaneously reduces energy consumption.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a heat pump combined cooling and heating system for a central heating thermal station.
Background
With the rapid advance of urbanization, the demand of centralized heating in cities and towns is increasing, and new challenges are provided for the heating capacity and the heat source of the existing centralized heating system. In a traditional central heating system, waste heat of a boiler room or a thermal power plant is generally used as a heat source to heat a primary pipe network, the primary pipe network heats a secondary pipe network through a heating station, and the secondary pipe network supplies heat to a user side. In the heat supply mode, heat energy is gradually radiated outwards to users by taking a heat source as a center, the conveying distance is long, the transmission loss is large, and the adjusting response speed is slow. And with the proposal of the double-carbon target, the heating capacity of the traditional coal-fired and gas-fired heat source is greatly limited, and the continuous increase of the current heating demand is difficult to match.
The heat pump is a device which consumes a small amount of driving energy and transfers heat energy from a low-temperature heat source to a high-temperature heat source by applying the reverse Carnot cycle principle. The refrigerant absorbs heat from the low-temperature heat source through the evaporator, extracts heat of the low-temperature heat source, consumes driving energy to change into a high-temperature and high-pressure state, releases heat to the high-temperature heat source through the condenser, and completes heat transfer from the low-temperature heat source to the high-temperature heat source. The heat pump has the advantages of wide application range, few limiting conditions, high efficiency, energy conservation, stability, reliability, cleanness, no pollution and the like. Taking a water source heat pump as an example, the energy efficiency ratio of the conventional water source heat pump under the standard working condition can be up to 4, even higher, and the heat supply energy consumption and the operating cost can be greatly reduced. The use of heat pumps for central heating may therefore be a viable solution to the conflict between heating capacity and heating demand.
However, the efficiency of the heat pump is affected by the temperature of the heat source, and as the temperature of the high-temperature heat source increases or the temperature of the low-temperature heat source decreases, the efficiency and the heat supply amount of the heat pump decrease. The temperature of the primary network is high, if the heat is directly supplemented in the primary network, the efficiency and the heat supply capacity of the heat pump are greatly reduced, and the heat exchange station of the centralized heat supply system is used as an intermediary for connecting the primary network and the secondary network, so that the heat pump equipment is suitable for supplementing heat to the secondary network. In addition, as technology progresses and productivity increases, building functions further tend to be diversified, which also causes changes in building loads. The scenes that the building needs to supply heat and cold simultaneously in different seasons are more and more, so how to utilize a primary pipe network, heat exchange station equipment and a secondary pipe network to meet the cold and heat requirements of end users to realize the maximum application of energy generated by a heat pump and reduce energy consumption is a problem which needs to be solved urgently at present.
Disclosure of Invention
The invention provides a heat pump cold and hot combined supply system for a central heating thermal station, which is used for solving the problems that the prior art can not supply cold and supplement heat in winter and supply cold and provide domestic hot water in summer.
The invention provides a heat pump cold and hot combined supply system for a central heating station, which comprises: the system comprises a primary pipe network, a secondary pipe network, a water source heat pump and a hot water type absorption refrigerating unit;
the water supply port of the primary pipe network is respectively connected with the water inlet of a generator of the hot water type absorption refrigerating unit, the high-temperature side water inlet of the heat exchanger and the lower end of the high-temperature side heat exchange coil of the heat storage tank; a water return port of the primary pipe network is respectively connected with a high-temperature side water outlet of the heat exchanger and a water outlet of an evaporator of the water source heat pump;
the water supply port of the secondary pipe network is respectively connected with the low-temperature side heat exchange coil water outlet of the heat storage tank, the low-temperature side water outlet of the heat exchanger and the condenser water outlet of the water source heat pump, and the water return port of the secondary pipe network is respectively connected with the absorber water inlet of the hot water type absorption refrigerating unit, the low-temperature side water inlet of the heat exchanger and the low-temperature side heat exchange coil water inlet of the heat storage tank.
Optionally, a high-temperature side water outlet of the heat exchanger is connected with a water inlet of an evaporator of a water source heat pump, a high-temperature side water inlet of the heat exchanger is connected with a water outlet of a generator of the hot water type absorption refrigerating unit and the upper end of a high-temperature side heat exchange coil of the heat accumulation tank, a water outlet of a condenser of the hot water type absorption refrigerating unit is connected with a water inlet of a condenser of the water source heat pump, an evaporator inlet of the water source heat pump is connected with a heat exchange coil outlet of the cold accumulation tank, and an evaporator outlet of the water source heat pump is connected with an inlet of an internal heat exchange coil of the cold accumulation tank; the lower end of a high-temperature side heat exchange coil of the heat storage tank is connected with an inlet of a condenser of the water source heat pump and an inlet of an absorber of the hot water type absorption refrigerating unit respectively, an outlet of the condenser of the water source heat pump is connected with the upper end of the high-temperature side heat exchange coil of the heat storage tank, and an outlet of the condenser of the water source heat pump is connected with a water inlet of the boiler.
Optionally, the water supply port of the primary pipe network is connected with the water inlet of the generator of the hot water type absorption refrigerating unit, the high-temperature side water inlet of the heat exchanger and the lower end of the heat exchange coil on the high-temperature side of the heat storage tank through a primary pressure pump.
Optionally, the water return port of the secondary pipe network is connected to the water inlet of the absorber of the hot water absorption refrigeration unit, the low-temperature side water inlet of the heat exchanger, and the water inlet of the low-temperature side heat exchange coil of the heat storage tank through a secondary circulation pump.
Optionally, the lower end of the high-temperature side heat exchange coil of the heat storage tank is connected with the inlet of the condenser of the water source heat pump and the inlet of the absorber of the hot water type absorption refrigerating unit through a heat collection circulating pump.
Optionally, a tap water replenishing pipe is connected to a lower water inlet of the heat storage tank, the tap water replenishing pipe is further connected to a domestic hot water supply pipe, and an upper water outlet of the heat storage tank is connected to the domestic hot water supply pipe.
Optionally, the tap water replenishing pipe is connected to the domestic hot water supply pipe and the water inlet at the lower part of the heat storage tank respectively after passing through the tap water replenishing pump.
The heat pump combined cooling and heating system for the central heating station provided by the invention has the following beneficial effects: the invention utilizes the technical scheme that a water source heat pump and an absorption refrigerating unit are combined with a primary pipe network and a secondary pipe network at a heating station to supply cold and heat, the technology can simultaneously supply cold and supplement heat in winter and supply cold and domestic hot water in summer, and the original device of the heating station, the primary pipe network, the secondary pipe network and the heat pump unit are organically combined.
Particularly, in winter, a primary pipe network is used for driving an absorption refrigerating unit to supply cold, and meanwhile, the absorption heat and the condensation heat of a water source heat pump and the absorption refrigerating unit are used for supplying heat to a secondary side, so that the expansion of a heat source and the primary pipe network is avoided, the transmission and distribution energy consumption and the energy loss are reduced, and a clean and efficient heat source is supplemented for the centralized heating of cities and towns; in summer, the water source heat pump and the absorption refrigerating unit are used for refrigerating, and the condensation heat and the absorption heat are recovered and used for supplying domestic hot water. The technology can simultaneously supply cold and supplement heat in winter and supply cold and domestic hot water in summer, thereby avoiding heat waste, realizing gradient utilization of energy and effectively reducing heat loss. The original device of the heating power station, the primary pipe network, the secondary pipe network and the heat pump unit are organically combined, the maximum application of energy generated by the heat pump is realized, and meanwhile, the energy consumption is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a heat pump combined cooling and heating system for a central heating thermal station provided by the invention;
FIG. 2 is a schematic view of the winter mode of operation of the heat pump combined cooling and heating system for a central heating thermal station provided by the present invention;
FIG. 3 is a schematic diagram of the summer and transition season operating modes of the heat pump combined heat and cold supply system for a central heating thermal station provided by the present invention;
reference numerals:
1: a primary pressure pump; 2: a heat storage tank; 3: a heat exchanger; 4: a water source heat pump; 5: a boiler; 6: a hot water type absorption refrigerating unit; 7: a cold water circulation pump; 8: a cold storage tank; 9: a cold storage circulating pump; 10: a secondary circulation pump; 11: a heat collection circulating pump; 12: the tap water replenishing pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The heat pump combined cooling and heating system for a district heating power station according to the present invention will be described with reference to fig. 1 to 3.
As shown in fig. 1, the embodiment provides a heat pump combined cooling and heating system for a central heating thermal station, which includes a primary pipe network, a secondary pipe network, a heat storage tank 2, a heat exchanger 3, a water source heat pump 4, a gas boiler 5, a hot water type absorption refrigerating unit 6, and a cold storage tank 8;
when the system operates in winter, a primary pipe network is respectively connected with a hot water type absorption refrigerating unit 6, a heat exchanger 3 and a heat storage tank 2, and the heat exchanger 3 is connected with a water source heat pump 4; the secondary pipe network is respectively connected with the hot water type absorption refrigerating unit 6, the heat exchanger 3 and the heat storage tank 2; the cold water return pipe is respectively connected with the cold accumulation tank 8 and the cold water supply pipe; the cold storage tank 8 is connected with a cold water supply pipe; the hot water type absorption refrigerating unit 6 is connected with the cold storage tank 8;
specifically, the hot water type absorption refrigerating unit 6 and the cold accumulation tank 8 bear the cold load of a user and supply cold to the user side; the heat load of the user is shared by the plate heat exchanger 3, the water source heat pump 4, the hot water type absorption refrigerating unit 6 and the heat storage tank 2, and the equipment supplies heat to the user through a secondary pipe network; the primary network supplies water, transfers heat to a secondary network through the plate heat exchanger 3, stores heat through the heat storage tank 2, provides a driving heat source for the hot water type absorption refrigerating unit 6 and provides a low-level heat source for the water source heat pump 4.
When the system operates in summer, the cold water return pipe is respectively connected with the cold water supply pipe and the cold accumulation tank 8; the cold storage tank 8 is respectively connected with a cold water supply port, the hot water type absorption refrigerating unit 6 and the water source heat pump 4; the heat storage tank 2 is respectively connected with a water source heat pump 4, a hot water type absorption refrigerating unit 6 and a domestic hot water supply pipe; the water source heat pump 4 is connected with a hot water type absorption refrigerating unit 6 through a gas boiler 5; the tap water replenishing pipe is respectively connected with the domestic hot water supply pipe and the heat storage tank 2.
Specifically, a water source heat pump 4, a hot water type absorption refrigerating unit 6 and a cold accumulation tank 8 share the cold load of a user and supply cold to the user side; domestic hot water of a user is heated by the heat storage tank 2, and the domestic hot water is heated by the water source heat pump 4 and the hot water type absorption refrigerating unit 6, so that the domestic hot water requirement of the user is met. The gas boiler 5 is used for heating the water discharged from the condenser of the water source heat pump 4 and driving the hot water type absorption refrigerating unit 6 to refrigerate as a driving heat source.
In one embodiment, when the system operates in winter, a primary pipe network water supply pipe is respectively connected with a generator water inlet of a hot water type absorption refrigerating unit 6, a high-temperature side water inlet of a plate heat exchanger 3 and the lower end of a heat exchange coil of a heat storage tank 2; a high-temperature side water outlet of the plate heat exchanger 3 is respectively connected with a water inlet of an evaporator of the water source heat pump 4, a water return port of a primary pipe network and a water outlet of the evaporator of the water source heat pump 4; the generator water outlet of the hot water type absorption refrigerating unit 6 is connected with the high-temperature side water inlet of the plate heat exchanger 3, and hot water still in a high-temperature state after passing through the generator is delivered to the plate heat exchanger 3. The upper end of the high-temperature side heat exchange coil of the heat storage tank 2 is connected with a high-temperature side water inlet of the plate heat exchanger 3; the high-temperature side outlet of the plate heat exchanger 3 is divided into two branches: one branch is connected with an inlet of an evaporator of the water source heat pump 4 and serves as a low-level heat source of the water source heat pump 4, an outlet of the evaporator of the water source heat pump 4 is connected with a water return pipe of the primary pipe network, the temperature of the low-level heat source of the water source heat pump is increased, the efficiency of the water source heat pump is improved, the temperature of return water of the primary heat supply network is reduced, the temperature difference of supply and return water of the primary heat supply network is increased, and the energy consumption of transmission and distribution is reduced; the other branch is connected with a water return pipe of the primary pipe network.
A water return pipe of the secondary pipe network is connected with an absorber water inlet of the hot water type absorption refrigerating unit 6 and used as cooling water to absorb absorption heat of the hot water type absorption refrigerating unit 6, an absorber outlet of the hot water type absorption refrigerating unit 6 is connected with a condenser inlet of the hot water type absorption refrigerating unit 6 to provide cooling water for a condenser and further recover heat, so that the heat is fully recovered, an outlet of the condenser of the hot water type absorption refrigerating unit 6 is connected with a condenser inlet of the water source heat pump 4, the water temperature is further heated, and then a condenser outlet of the water source heat pump 4 is connected with a secondary pipe network water supply pipe and used for supplying heat to users;
a water return pipe of the secondary pipe network is connected with a low-temperature side water inlet of the plate heat exchanger 3 and is heated by the plate heat exchanger 3, and a low-temperature side water outlet of the plate heat exchanger 3 is connected with a secondary pipe network water supply to provide heat for a user side; a water return pipe of the secondary pipe network is connected with a low-temperature side water inlet of the heat storage tank 2, water at the low-temperature side water inlet is heated, and a low-temperature side heat exchange coil water outlet of the heat storage tank 2 is connected with a secondary pipe network water supply pipe to supply heat to users;
the cold water return pipe is respectively connected with the water inlet of the cold accumulation tank 8 and the cold water supply pipe; the water outlet of the cold storage tank 8 is connected with a cold water supply pipe; the water outlet of the evaporator of the hot water type absorption refrigerating unit 6 is connected with the inlet of the internal heat exchange coil of the cold storage tank 8, so that the cold storage tank 8 is cooled.
In one embodiment, when the system is operated in summer, the outlet of the evaporator of the water source heat pump 4 is connected with the inlet of the internal heat exchange coil of the cold accumulation tank 8; the tap water replenishing pipe is respectively connected with a domestic hot water supply pipe and a water inlet at the lower part of the heat storage tank 2; and a water outlet in the upper part of the heat storage tank 2 is connected with a domestic hot water supply pipe. The outlet of the internal heat exchange coil of the cold storage tank 8 is respectively connected with the inlet of the evaporator of the hot water type absorption refrigerating unit 6 and the inlet of the evaporator of the water source heat pump 4. The water outlet of the evaporator of the hot water absorption refrigerating unit 6 is connected with the inlet of the internal heat exchange coil of the cold storage tank 8, and the outlet of the evaporator of the water source heat pump 4 is connected with the inlet of the internal heat exchange coil of the cold storage tank 8 to cool the cold storage tank 8. The outlet of the heat exchange coil inside the heat storage tank 2 is respectively connected with the inlet of a condenser of the water source heat pump 4 and the inlet of an absorber of the hot water type absorption refrigerating unit 6, the outlet of the absorber of the hot water type absorption refrigerating unit 6 is connected with the inlet of the condenser thereof, and the outlet of the condenser of the hot water type absorption refrigerating unit 6 is connected with the inlet of the condenser of the water source heat pump 4.
The outlet of the condenser of the water source heat pump 4 is connected with the inlet of the internal heat exchange coil of the heat storage tank 2 and used for heating domestic hot water, the outlet of the condenser of the water source heat pump 4 is also connected with the gas boiler 5 and is connected with the generator inlet of the hot water type absorption refrigerating unit 6 after being heated to high temperature and used as a driving heat source to drive the absorption refrigerating unit to refrigerate. The generator outlet of the hot water type absorption refrigerating unit 6 is connected with the inlet of the heat exchange coil inside the heat storage tank 2 and used for heating domestic hot water.
In one embodiment, as shown in fig. 2, when the system operates in winter, the water supply pipe of the primary pipe network is connected with the primary booster pump 1, and after passing through the primary booster pump 1, the water supply pipe of the primary pipe network is divided into three branches, wherein one branch is connected with the water inlet of the generator of the hot water absorption type refrigerating unit 6 to provide a driving heat source for the generator; the other branch is connected with a high-temperature side water inlet of the plate heat exchanger 3, and heat is transmitted to a secondary pipe network through the plate heat exchanger; and the other branch is connected with the lower end of the high-temperature side heat exchange coil of the heat storage tank 2 and transfers heat to the heat storage tank 2.
In one embodiment, as shown in fig. 2, during winter operation, the water return pipe of the secondary pipe network is connected to a secondary circulation pump 10, and after passing through the secondary circulation pump, the secondary pipe network water return is divided into three branches: one branch is connected with an absorber water inlet of the hot water type absorption refrigerating unit 6, the other branch is connected with a low-temperature side water inlet of the plate heat exchanger 3, and the other branch is connected with a low-temperature side heat exchange coil water inlet of the heat storage tank 2.
In one embodiment, as shown in fig. 2, during winter operation, the cold water return pipe is divided into two branches after passing through the cold water circulating pump 7, wherein one branch is connected with the water inlet of the cold storage tank 8, and the other branch is connected with the cold water supply pipe as a bypass; the water outlet of the cold storage tank 8 is connected with a cold water supply pipe. The outlet of the heat exchange coil in the cold accumulation tank 8 is connected with the inlet of the evaporator of the hot water absorption refrigerating unit 6 after passing through the cold accumulation circulating pump 9.
Further, the control mode of the winter operation condition specifically is as follows:
(1) Cooling control
The temperature of the cold water supply pipe is detected by a temperature sensor, and the temperature of the cold storage tank 8 is monitored by a temperature sensor at the bottom of the cold storage tank; according to the cold water supply temperature and the temperature of the cold accumulation tank, the flow rates of the cold water circulating pump 7 and the cold accumulation circulating pump 9, the cold water return bypass flux and the power of the hot water type absorption refrigerating unit are adjusted, and the cold water return at the user side is cooled so as to meet the cold load of the user.
(2) Heat supply control
The return water temperature of the secondary pipe network is monitored by using the temperature sensor, and according to the difference of the return water temperature, the control principle of the system is as follows:
a. when the plate heat exchanger 3 and the hot water recovery type absorption refrigerating unit 6 are independently started to supply heat, and the return water temperature of a user can meet the set requirement, the valves V6 and V15 are closed, the water source heat pump 4 and the heat storage tank 2 are not started to supply heat, and meanwhile, part of water supplied by the primary network is used for storing heat in the heat storage tank 2;
b. when the plate heat exchanger 3 and the hot water type absorption refrigerating unit 6 are independently started to supply heat, and the return water temperature of a user cannot meet the set requirement, the valves V3 and V6 are closed, and the heat storage tank 2, the plate heat exchanger 3 and the hot water type absorption refrigerating unit 6 are started to supply heat at the same time;
c. when the plate heat exchanger 3 and the heat absorption and condensation of the hot water type absorption refrigerating unit 6 are independently started, and the heat storage tank 2 is opened for heat supply, when the return water temperature of a user cannot meet the set requirement, the valves V5 and V15 are closed, the heat storage tank 2 is not started for heat supply, the water source heat pump 4 is started for supplementary heat supply, the water source heat pump 4, the plate heat exchanger 3 and the hot water type absorption refrigerating unit 6 are simultaneously used for heat supply, and meanwhile, part of water supplied by a primary network is used for storing heat in the heat storage tank 2;
in one embodiment, as shown in fig. 3, when the system operates in summer, the cold water return pipe is connected with the cold water circulating pump 7, the cold water return pipe is divided into two branches after passing through the cold water circulating pump 7, one branch is connected with the cold water supply pipe as a bypass after passing through the valve V9, and the other branch is connected with the water inlet of the cold storage tank 8. The water outlet of the cold storage tank 8 is connected with a cold water supply port. The outlet of the heat exchange coil in the cold storage tank 8 is divided into two branches after passing through the cold storage circulating pump 9, wherein one branch is connected with the inlet of the evaporator of the hot water type absorption refrigerating unit 6, and the other branch is connected with the inlet of the evaporator of the water source heat pump 4.
In one embodiment, as shown in fig. 3, the lower end of the high temperature side heat exchange coil inside the heat storage tank 2 is connected to a heat collection circulation pump 11, and is divided into two branches after passing through the heat collection circulation pump 11, wherein one branch is connected to the condenser inlet of the water source heat pump 4, the other branch is connected to the absorber inlet of the hot water type absorption refrigeration unit 6, the absorber outlet of the hot water type absorption refrigeration unit 6 is connected to the condenser inlet thereof, and the condenser outlet of the hot water type absorption refrigeration unit 6 is connected to the condenser inlet of the water source heat pump 4.
In one embodiment, as shown in fig. 3, the tap water replenishing pipe is divided into two branches after passing through the tap water replenishing pump 12, wherein one branch is connected with the domestic hot water supply pipe as a bypass, and the other branch is connected with the water inlet at the lower part of the heat storage tank 2. And a water outlet at the upper part of the heat storage tank 2 is connected with a domestic hot water supply pipe.
Further, the control mode of the summer operation condition has the following conditions:
(1) Temperature sensors at the cold water supply pipe and the domestic hot water supply pipe are used for monitoring whether the water supply temperature meets the requirement, and if the cold load and the domestic hot water load can be met by the independent operation of the water source heat pump 4. Then valves V11, V16, V19, V21 are closed, the outlet of the heat exchange coil of the cold accumulation tank 8 is connected with the inlet of the evaporator of the water source heat pump 4 after passing through the cold accumulation circulating pump 9 and is cooled, and then the outlet of the evaporator of the water source heat pump 4 is connected with the inlet of the heat exchange coil of the cold accumulation tank 8, and the cold energy is brought back to the cold accumulation tank. The lower end of the heat-storage tank 2 high-temperature side heat-exchange coil is connected with the inlet of the water source heat pump 4 condenser through the heat-storage circulating pump 11 and then heated, and the outlet of the water source heat pump 4 condenser is connected with the upper end of the heat-storage tank 2 high-temperature side heat-exchange coil to heat the domestic hot water.
(2) Temperature sensors at the cold water supply pipe and the domestic hot water supply pipe are used for monitoring whether the water supply temperature meets the requirement, and if the water source heat pump 4 operates alone, the cold load or the domestic hot water requirement cannot be met. The valve V20 is closed. The outlet of the heat exchange coil of the cold accumulation tank 8 is divided into two branches after passing through the cold accumulation circulating pump 9, one branch is connected with the inlet of the evaporator of the hot water type absorption refrigerating unit 6, the other branch is connected with the inlet of the evaporator of the hot water type absorption refrigerating unit 6, the outlet of the evaporator of the water source heat pump 4 is connected with the inlet of the heat exchange coil of the cold accumulation tank 8, the outlet of the evaporator of the hot water type absorption refrigerating unit 6 is connected with the inlet of the heat exchange coil of the cold accumulation tank 8, and the water source heat pump 4 and the hot water type absorption refrigerating unit 6 work together to reduce the temperature of the cold accumulation tank 8. The lower end of the heat exchange coil on the high-temperature side of the heat storage tank 2 is connected with an absorber inlet of the hot water type absorption refrigerating unit 6 after passing through the heat storage circulating pump 11, an absorber of the hot water type absorption refrigerating unit 6 is connected with a condenser inlet of the hot water type absorption refrigerating unit, a condenser outlet of the hot water type absorption refrigerating unit is connected with a condenser inlet of the water source heat pump 4, and hot water firstly passes through the hot water type absorption refrigerating unit 6 to recover absorption heat and condensation heat and then is further heated by the water source heat pump 4. The outlet of the condenser of the water source heat pump 4 is divided into two branches, and the branch is connected with the upper end of the heat exchange coil on the high-temperature side of the heat storage tank 2 to transfer heat to domestic hot water; the second branch is connected with an inlet of the gas boiler 5, is heated and then is connected to an inlet of a generator of the hot water type absorption refrigerating unit 6 as a driving heat source, drives the hot water type absorption refrigerating unit 6 to refrigerate, and an outlet of the generator is connected with the upper end of a heat exchange coil of the heat storage tank 2, so that hot water still at a high temperature is conveyed to the heat storage tank 2, and the temperature of the hot water is increased.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention may be understood as specific cases by those of ordinary skill in the art.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A heat pump combined cooling and heating system for a district heating and power station, comprising: the system comprises a primary pipe network, a secondary pipe network, a water source heat pump (4) and a hot water type absorption refrigerating unit (6);
the water supply port of the primary pipe network is respectively connected with the water inlet of a generator of the hot water type absorption refrigerating unit (6), the high-temperature side water inlet of the heat exchanger (3) and the lower end of the high-temperature side heat exchange coil of the heat storage tank (2); a water return port of the primary pipe network is respectively connected with a high-temperature side water outlet of the heat exchanger (3) and a water outlet of an evaporator of the water source heat pump (4);
the water supply port of the secondary pipe network is respectively connected with the low-temperature side heat exchange coil water outlet of the heat storage tank (2), the low-temperature side water outlet of the heat exchanger (3) and the water outlet of the condenser of the water source heat pump (4), and the water return port of the secondary pipe network is respectively connected with the absorber water inlet of the hot water type absorption refrigerating unit (6), the low-temperature side water inlet of the heat exchanger (3) and the low-temperature side heat exchange coil water inlet of the heat storage tank (2).
2. The heat pump combined cooling and heating system for the central heating thermal station according to claim 1, wherein a high-temperature side water outlet of the heat exchanger (3) is connected with an evaporator water inlet of a water source heat pump (4), a high-temperature side water inlet of the heat exchanger (3) is connected with a generator water outlet of the hot water type absorption refrigerating unit (6) and an upper end of a high-temperature side heat exchange coil of the heat storage tank (2), a condenser water outlet of the hot water type absorption refrigerating unit (6) is connected with a condenser water inlet of the water source heat pump (4), an evaporator inlet of the water source heat pump (4) is connected with a heat exchange coil outlet of a cold storage tank (8), and an evaporator outlet of the water source heat pump (4) is connected with an inner heat exchange coil inlet of the cold storage tank (8); the heat storage system is characterized in that the lower end of a high-temperature side heat exchange coil of the heat storage tank (2) is respectively connected with the inlet of a condenser of the water source heat pump (4) and the inlet of an absorber of the hot water type absorption refrigerating unit (6), the outlet of the condenser of the water source heat pump (4) is connected with the upper end of the high-temperature side heat exchange coil of the heat storage tank (2), and the outlet of the condenser of the water source heat pump (4) is connected with the water inlet of the boiler (5).
3. The heat pump combined cooling and heating system for the district heating and power station as claimed in claim 1, wherein the water supply port of the primary pipe network is connected with the generator water inlet of the hot water type absorption refrigerating unit (6), the high temperature side water inlet of the heat exchanger (3) and the lower end of the high temperature side heat exchange coil of the heat storage tank (2) through the primary booster pump (1).
4. The heat pump combined cooling and heating system for the district heating and power station as claimed in claim 1, wherein the return water port of the secondary pipe network is connected to the water inlet of the absorber of the hot water type absorption chiller unit (6), the water inlet of the low temperature side of the heat exchanger (3), and the water inlet of the low temperature side heat exchange coil of the heat storage tank (2) through a secondary circulation pump (10).
5. The heat pump combined cooling and heating system for the district heating and power station as claimed in claim 2, wherein the lower end of the high temperature side heat exchange coil of the heat storage tank (2) is connected with the inlet of the condenser of the water source heat pump (4) and the inlet of the absorber of the hot water type absorption refrigerating unit (6) through a heat collection circulating pump (11).
6. The heat pump combined cooling and heating system for the district heating and power station as claimed in claim 2, wherein the lower water inlet of the heat storage tank (2) is connected with a tap water replenishing pipe, the tap water replenishing pipe is further connected with a domestic hot water supply pipe, and the upper water outlet of the heat storage tank (2) is connected with the domestic hot water supply pipe.
7. The heat pump combined cooling and heating system for the central heating thermal station according to claim 6, wherein the tap water replenishing pipe is connected with the domestic hot water supply pipe and the lower water inlet of the heat storage tank (2) respectively after passing through a tap water replenishing pump (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310003749.0A CN115949983B (en) | 2023-01-03 | 2023-01-03 | Heat pump cold and hot combined supply system for central heating power station |
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| CN202310003749.0A CN115949983B (en) | 2023-01-03 | 2023-01-03 | Heat pump cold and hot combined supply system for central heating power station |
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| CN115949983A true CN115949983A (en) | 2023-04-11 |
| CN115949983B CN115949983B (en) | 2024-04-16 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100005734U (en) * | 2008-11-27 | 2010-06-07 | 유경윤 | Heat pump storage system |
| CN102269442A (en) * | 2011-07-13 | 2011-12-07 | 清华大学 | Heating system utilizing heat pump technology to improve heating capacity of central heating pipe network |
| CN102331110A (en) * | 2011-08-31 | 2012-01-25 | 北京中科华誉能源技术发展有限责任公司 | Regional heating, cooling and power combined energy system and method based on absorption heat exchange |
| KR101194319B1 (en) * | 2012-04-18 | 2012-10-24 | 유한회사 세한이엔지 | Hybrid of heat pump system |
| CN110030768A (en) * | 2019-04-24 | 2019-07-19 | 北京建筑大学 | The district heating and cooling system and heating and cooling method of industrial waste heat driving |
| CN217635828U (en) * | 2022-06-21 | 2022-10-21 | 北方联合电力有限责任公司呼和浩特金桥热电厂 | Heat exchange station scene geothermal energy coupling absorption heat pump heating system |
-
2023
- 2023-01-03 CN CN202310003749.0A patent/CN115949983B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100005734U (en) * | 2008-11-27 | 2010-06-07 | 유경윤 | Heat pump storage system |
| CN102269442A (en) * | 2011-07-13 | 2011-12-07 | 清华大学 | Heating system utilizing heat pump technology to improve heating capacity of central heating pipe network |
| CN102331110A (en) * | 2011-08-31 | 2012-01-25 | 北京中科华誉能源技术发展有限责任公司 | Regional heating, cooling and power combined energy system and method based on absorption heat exchange |
| KR101194319B1 (en) * | 2012-04-18 | 2012-10-24 | 유한회사 세한이엔지 | Hybrid of heat pump system |
| CN110030768A (en) * | 2019-04-24 | 2019-07-19 | 北京建筑大学 | The district heating and cooling system and heating and cooling method of industrial waste heat driving |
| CN217635828U (en) * | 2022-06-21 | 2022-10-21 | 北方联合电力有限责任公司呼和浩特金桥热电厂 | Heat exchange station scene geothermal energy coupling absorption heat pump heating system |
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| CN115949983B (en) | 2024-04-16 |
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