CN106839519B - Heat source tower heat pump system for realizing solution regeneration based on hydrate method - Google Patents
Heat source tower heat pump system for realizing solution regeneration based on hydrate method Download PDFInfo
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- CN106839519B CN106839519B CN201710236543.7A CN201710236543A CN106839519B CN 106839519 B CN106839519 B CN 106839519B CN 201710236543 A CN201710236543 A CN 201710236543A CN 106839519 B CN106839519 B CN 106839519B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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Abstract
The invention relates to a heat source tower heat pump system for realizing solution regeneration based on a hydrate method and a circulation process, wherein the system comprises a heat source tower heat supply system, a solution regeneration system and a solar heat collection system, the heat source tower heat supply system comprises a heat pump unit, a solution pump I, a solenoid valve III, a solenoid valve VI and a heat source tower, the solution regeneration system comprises a hydrate generation kettle, a hydrate separator, a hydrate decomposer, a gas-liquid separator, a compressor, a condenser, a throttle valve, a solution pump II, a solution pump III, a solenoid valve V, a solenoid valve ten, a solenoid valve eleven and a solenoid valve twelve, and the solar heat collection system comprises a solar heat collector, a water pump II, a solenoid valve sixteen, a heat accumulator, a water pump I and a solenoid valve eight. The invention adopts the hydrate method to realize solution regeneration, the regenerated concentrated solution is heated by the condenser and then mixed with the solution at the outlet of the heat source tower, and the mixture is sent into the heat pump unit to release heat, thereby reducing the load of the heat source tower system and realizing the high-efficiency operation of the system.
Description
Technical Field
The invention belongs to the field of air conditioning system design, and particularly relates to a heat source tower heat pump system for realizing solution regeneration based on a hydrate method.
Background
The region in the middle and downstream of the Yangtze river belongs to a summer hot and winter cold region, and at present, the most common cold and heat source schemes of the air conditioner in the region are a water chilling unit, a boiler, an air source heat pump and the like. In winter, the water chilling unit is in an idle state, the equipment utilization rate is low, and the environment is polluted due to the heat supply of the boiler; and the air source heat pump has the problem of frosting when running in winter.
To address these problems, some workers have proposed a heat source tower heat pump system. In summer working conditions, the heat source tower is a cooling tower, and the heat of the cooling water system is discharged into the air; in winter, the heat source tower is utilized to absorb heat from the air and then release heat to the heat pump.
The heat source tower is divided into an open heat source tower and a closed heat source tower. The closed heat source tower solution and air indirectly exchange heat, so that the heat exchange efficiency is low and less adoption is caused. The solution in the open heat source tower is in direct contact with air, so that the heat exchange efficiency is high, but the solution can absorb water vapor in the air in the operation process, so that the concentration of the solution is reduced, and the freezing point of the solution is raised. In order to ensure the safe operation of the system, the absorbed water is required to be discharged, so that the concentration of the solution is increased, and the solution regeneration is realized.
Therefore, how to solve the solution regeneration problem of the heat source tower system, designing a heat source tower heat pump system with efficient operation becomes a technical problem that needs to be solved urgently.
Disclosure of Invention
In order to solve the problems, the invention provides a heat source tower heat pump system for realizing solution regeneration based on a hydrate method, which realizes the efficient utilization of heat and improves the efficiency of a heat pump unit.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the invention relates to a heat source tower heat pump system for realizing solution regeneration based on a hydrate method, which comprises a heat source tower heat supply system, a solution regeneration system and a solar heat collection system, wherein the heat source tower heat supply system comprises a heat pump unit, a solution pump I, a solenoid valve III, a solenoid valve VI and a heat source tower, the solution regeneration system comprises a hydrate generation kettle, a hydrate separator, a hydrate decomposer, a gas-liquid separator, a compressor, a condenser, a throttle valve, a solution pump II, a solution pump III, a solenoid valve V, a solenoid valve IV and a solenoid valve IV, and the solar heat collection system comprises a solar heat collector, a water pump II, a solenoid valve IV, a heat accumulator, a water pump I and a solenoid valve V;
the circulation process of the heat source tower heat supply system is as follows: the solution at the outlet of the heat pump unit enters a heat source tower through a solution pump I and a solenoid valve VI, exchanges heat with air in the heat source tower, increases the temperature of the solution after absorbing heat, enters the heat pump unit through a solenoid valve III, and releases heat continuously to finish the heat supply process of the heat source tower;
the circulation process of the solution regeneration system is as follows: opening a solenoid valve V, enabling a dilute solution at the outlet of a heat pump unit to enter a hydrate generation kettle through a solution pump I and a solenoid valve V, introducing a hydrating agent from the lower part into the hydrate generation kettle, enabling water and the hydrating agent to generate gas hydrate similar to ice crystals under low temperature and high pressure, enabling the gas hydrate to enter a hydrate separator through a solution pump II and a solenoid valve V, continuously enabling the gas hydrate and the solution to be separated, enabling the gas hydrate at the upper layer to enter a hydrate decomposer through a solution pump III and a solenoid valve V, enabling the solution at the lower layer to return to the hydrate generation kettle through a solenoid valve V, enabling high-temperature water from a heat accumulator to heat the gas hydrate in the hydrate decomposer, enabling the gas hydrate to be decomposed into water and the gas hydrate under high temperature and normal pressure conditions, enabling the water at the lower part to be fifteenly discharged through the solenoid valve, enabling the gas hydrate at the upper part to enter the gas-liquid separator for gas-liquid separation, enabling the gas hydrate to enter a compressor for compression, enabling the gas to be changed into high pressure from the low pressure, enabling the gas hydrate to enter the condenser for condensation, enabling the gas hydrate to be subjected to pressure reduction through a throttle valve, enabling the solution to be subjected to pressure reduction, and finally enabling the high-temperature water to be introduced into the hydrate generation kettle, enabling the high-temperature water to be combined with the gas hydrate to be combined into a concentrated solution, recycling system, and generating a concentrated solution, and recycling solution, and regenerating solution;
the circulation process of the solar heat collection system is as follows: the water at the outlet of the heat accumulator enters the solar heat collector through the water pump II and the electromagnetic valve sixteen, absorbs the energy of sunlight, increases the water temperature, returns to the heat accumulator to complete the heat collection process, enters the heat accumulator through the water pump I and the electromagnetic valve eight, is heated in the heat accumulator, continuously returns to the hydrate decomposer to release heat after being heated, provides heat for decomposing gas hydrate, absorbs heat to the heat accumulator after releasing heat, and circularly performs.
The invention further improves that: the concentrated solution at the lower part of the hydrate generation kettle enters a liquid storage device through a filter and an electromagnetic valve thirteen, the gas hydration agent coming out along with the solution is arranged at the upper layer of the liquid storage device, after a certain pressure is accumulated, the electromagnetic valve fourteen is opened, so that the gas hydration agent enters a gas-liquid separator and then enters a compressor for compression, the concentrated solution in the liquid storage device enters a condenser for heat exchange with the high-temperature gas hydration agent, on one hand, the gas hydration agent is condensed, on the other hand, the temperature of the solution is increased, and then the concentrated solution is mixed with the solution at the outlet of a heat source tower through the electromagnetic valve IV and enters a heat pump unit for heat release.
The invention further improves that: the water temperature returned from the hydrate decomposer is higher, the electromagnetic valve eight is closed, the solution enters the plate heat exchanger through the water pump I and the electromagnetic valve seven, the electromagnetic valve III is closed, the solution at the outlet of the heat source tower enters the plate heat exchanger through the electromagnetic valve II, the solution and the water exchange heat in the plate heat exchanger, the solution is heated through the electromagnetic valve I after the temperature of the solution rises, the water at the outlet of the plate heat exchanger is cooled, then the solution is heated through the heat accumulator, the water is heated to the hydrate decomposer after the temperature rises, the heat is provided for the hydrate decomposition, when the concentration of the solution is higher, the solution concentration process is stopped, the electromagnetic valve nine is opened, the water at the outlet of the heat accumulator directly enters the plate heat exchanger through the water pump I and the electromagnetic valve seven, the heat exchange is carried out between the solution and the solution, and then the heat is absorbed through the heat accumulator.
The invention further improves that: the hydrating agent adopts R141b and C 3 H 8 Or CO 2 。
The invention further improves that: working medium of the heat source tower system can adopt NaCl solution and CaCl 2 A solution.
The beneficial effects of the invention are as follows: the heat source tower heat pump system for realizing solution regeneration based on the hydrate method adopts the hydrate method to realize solution regeneration, and the regenerated concentrated solution is heated through a condenser and then mixed with the solution at the outlet of the heat source tower, and is sent into a heat pump unit to release heat, so that the safe operation of the system is ensured, and the efficient utilization of heat is realized.
And secondly, the heat source tower heat pump system for realizing solution regeneration based on a hydrate method adopts a solar heat collection system to provide heat for the decomposition process of gas hydrate, and can also heat the outlet solution of the heat source tower, so that the temperature of the outlet solution is increased, and the evaporation temperature of a heat pump unit is increased, so that the efficiency of the heat pump unit is improved.
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Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The present invention will be further described in detail with reference to the drawings and examples, which are only for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in FIG. 1, the present invention is
The heat source tower heat pump system for realizing solution regeneration based on a hydrate method is characterized in that: the system comprises a heat source tower heat supply system, a solution regeneration system and a solar heat collection system, wherein the heat source tower heat supply system comprises a heat pump unit, a solution pump I, a solenoid valve III, a solenoid valve VI and a heat source tower, the solution regeneration system comprises a hydrate generation kettle, a hydrate separator, a hydrate decomposer, a gas-liquid separator, a compressor, a condenser, a throttle valve, a solution pump II, a solution pump III, a solenoid valve V, a solenoid valve ten, a solenoid valve eleven and a solenoid valve twelve, and the solar heat collection system comprises a solar heat collector, a water pump II, a solenoid valve sixteen, a heat accumulator, a water pump I and a solenoid valve eighth;
the circulation process of the heat source tower heat supply system is as follows: the solution at the outlet of the heat pump unit enters a heat source tower through a solution pump I and a solenoid valve VI, exchanges heat with air in the heat source tower, increases the temperature of the solution after absorbing heat, enters the heat pump unit through a solenoid valve III, and releases heat continuously to finish the heat supply process of the heat source tower;
the circulation process of the solution regeneration system is as follows: opening a solenoid valve V, enabling a dilute solution at the outlet of a heat pump unit to enter a hydrate generation kettle through a solution pump I and a solenoid valve V, introducing a hydrating agent from the lower part into the hydrate generation kettle, under the conditions of low temperature and high pressure, enabling water and the hydrating agent to generate gas hydrate similar to ice crystals, enabling the gas hydrate to float on the water surface due to the density lower than that of the solution, enabling the gas hydrate to enter a hydrate separator through a solution pump II and a solenoid valve V, continuously enabling the gas hydrate and the solution to be separated, enabling the gas hydrate at the upper layer to enter a hydrate decomposer through a solution pump III and the solenoid valve V, enabling the solution at the lower layer to return to the hydrate generation kettle through the solenoid valve V, enabling high-temperature water from a heat accumulator to be heated in the hydrate decomposer, enabling the gas hydrate to be decomposed into water and gas hydrate under the conditions of high temperature and normal pressure, enabling the water at the lower part to be discharged through the solenoid valve V, enabling the gas hydrate at the upper part to enter the gas-liquid separator to be subjected to gas-liquid separation, enabling the gas hydrate to enter the compressor to be compressed, enabling the gas to be changed into high pressure, enabling the gas to enter the condenser to be subjected to condensation, enabling the gas to be subjected to pressure reduction, enabling the gas hydrate to be subjected to the condensation, and finally enabling the solution to enter the solenoid valve V to enter the water to be cooled to be recycled to form a concentrated solution, and recycled into the solution, and the solution is generated to be recycled to be changed into the concentrated;
the circulation process of the solar heat collection system is as follows: the water at the outlet of the heat accumulator enters the solar heat collector through the water pump II and the electromagnetic valve sixteen, absorbs the energy of sunlight, increases the water temperature, returns to the heat accumulator to complete the heat collection process, enters the heat accumulator through the water pump I and the electromagnetic valve eight, is heated in the heat accumulator, continuously returns to the hydrate decomposer to release heat after being heated, provides heat for decomposing gas hydrate, absorbs heat to the heat accumulator after releasing heat, and circularly performs.
After water and a hydrating agent in the hydrate generating kettle generate gas hydrate, the concentration of the solution is increased, the concentrated solution at the lower part of the generating kettle is finished, the concentrated solution enters a liquid storage device through a filter and an electromagnetic valve thirteen, the gas hydrating agent coming out along with the solution is arranged at the upper layer of the liquid storage device, after a certain pressure is accumulated, the electromagnetic valve fourteen is opened, the gas hydrating agent enters a gas-liquid separator, then enters a compressor for compression, the concentrated solution in the liquid storage device enters a condenser for heat exchange with the high-temperature gas hydrating agent, on one hand, the gas hydrating agent is condensed, on the other hand, the temperature of the solution is increased, and then the concentrated solution is mixed with the solution at the outlet of a heat source tower through the electromagnetic valve IV and enters a heat pump unit for heat release.
When the solar energy absorbed by the solar heat collector is larger than the heat required by the decomposition of the hydrate, the solar heat collector system can be utilized for assisting in supplying heat, the water temperature returned from the hydrate decomposer is higher, the electromagnetic valve eight is closed, the solution at the outlet of the heat source tower enters the plate heat exchanger through the water pump I and the electromagnetic valve seven, the electromagnetic valve three is closed, the solution at the outlet of the heat source tower enters the plate heat exchanger through the electromagnetic valve II, the solution and the water exchange heat in the plate heat exchanger, the heat of the solution is released after the temperature of the solution rises, the water at the outlet of the plate heat exchanger is reduced, the solution is heated in the heat accumulator, the water is heated in the hydrate decomposer after the temperature rises, the heat is provided for the decomposition of the hydrate, when the concentration of the solution is higher, the concentration process of the solution is stopped, the electromagnetic valve nine is opened, the water at the outlet of the heat accumulator directly passes through the water pump I and the electromagnetic valve seven, enters the plate heat exchanger to exchange heat with the solution, and then the heat is absorbed by the heat accumulator.
Wherein: the hydration agent can be R141b, C 3 H 8 Or CO 2 Working medium of the heat source tower system adopts NaCl solution and CaCl 2 A solution.
The invention discloses a heat source tower heat pump system for realizing solution regeneration based on a hydrate method, which comprises a heat source tower heat supply loop, a solution regeneration loop and a solar heat collection loop. The invention adopts the hydrate method to realize the solution regeneration, the regenerated concentrated solution is heated by the condenser and then mixed with the solution at the outlet of the heat source tower, and the mixture is sent into the heat pump unit to release heat, thereby reducing the load of the heat source tower system. The solar heat collection system is adopted to provide heat for the decomposition process of the gas hydrate, and can also heat the outlet solution of the heat source tower, so that the temperature of the outlet solution is increased, the evaporation temperature of the heat pump unit is increased, and the efficiency of the heat pump unit is improved. The invention adopts solar energy to assist in heating, thereby not only solving the problem of solution regeneration of the heat source tower and ensuring the safe operation of the system, but also fully utilizing the solar energy and the solution regeneration heat and realizing the efficient operation of the system.
Claims (5)
1. The heat source tower heat pump system for realizing solution regeneration based on a hydrate method is characterized in that: the system comprises a heat source tower heat supply system, a solution regeneration system and a solar heat collection system, wherein the heat source tower heat supply system comprises a heat pump unit, a solution pump I, a solenoid valve III, a solenoid valve VI and a heat source tower, the solution regeneration system comprises a hydrate generation kettle, a hydrate separator, a hydrate decomposer, a gas-liquid separator, a compressor, a condenser, a throttle valve, a solution pump II, a solution pump III, a solenoid valve V, a solenoid valve ten, a solenoid valve eleven and a solenoid valve twelve, and the solar heat collection system comprises a solar heat collector, a water pump II, a solenoid valve sixteen, a heat accumulator, a water pump I and a solenoid valve eighth;
the circulation process of the heat source tower heat supply system is as follows: the solution at the outlet of the heat pump unit enters a heat source tower through a solution pump I and a solenoid valve VI, exchanges heat with air in the heat source tower, increases the temperature of the solution after absorbing heat, enters the heat pump unit through a solenoid valve III, and continuously releases heat to finish the heat supply process of the heat source tower;
the circulation process of the solution regeneration system is as follows: opening a solenoid valve V, enabling a dilute solution at the outlet of a heat pump unit to enter a hydrate generation kettle through a solution pump I and a solenoid valve V, introducing a hydrating agent from the lower part into the hydrate generation kettle, enabling water and the hydrating agent to generate gas hydrate similar to ice crystals under low temperature and high pressure, enabling the gas hydrate to enter a hydrate separator through a solution pump II and a solenoid valve V, continuously enabling the gas hydrate and the solution to be separated, enabling the gas hydrate at the upper layer to enter a hydrate decomposer through a solution pump III and a solenoid valve V, enabling the solution at the lower layer to return to the hydrate generation kettle through a solenoid valve V, enabling high-temperature water from a heat accumulator to heat the gas hydrate in the hydrate decomposer, enabling the gas hydrate to be decomposed into water and the gas hydrate under high temperature and normal pressure conditions, enabling the water at the lower part to be fifteenly discharged through the solenoid valve, enabling the gas hydrate at the upper part to enter the gas-liquid separator for gas-liquid separation, enabling the gas hydrate to enter a compressor for compression, enabling the gas to be changed into high pressure from the low pressure, enabling the gas hydrate to enter the condenser for condensation, enabling the gas hydrate to be subjected to pressure reduction through a throttle valve, enabling the solution to be subjected to pressure reduction, and finally enabling the high-temperature water to be introduced into the hydrate generation kettle, enabling the high-temperature water to be combined with the gas hydrate to be combined into a concentrated solution, recycling system, and generating a concentrated solution, and recycling solution, and regenerating solution;
the circulation process of the solar heat collection system is as follows: the water at the outlet of the heat accumulator enters the solar heat collector through the water pump II and the electromagnetic valve sixteen, absorbs the energy of sunlight, increases the water temperature, returns to the heat accumulator to complete the heat collection process, enters the heat accumulator through the water pump I and the electromagnetic valve eight, is heated in the heat accumulator, continuously returns to the hydrate decomposer to release heat after being heated, provides heat for decomposing gas hydrate, absorbs heat to the heat accumulator after releasing heat, and circularly performs.
2. The heat source tower heat pump system for realizing solution regeneration based on a hydrate method according to claim 1, wherein: the concentrated solution at the lower part of the hydrate generation kettle enters a liquid storage device through a filter and an electromagnetic valve thirteen, the gas hydration agent coming out along with the solution is arranged at the upper layer of the liquid storage device, after a certain pressure is accumulated, the electromagnetic valve fourteen is opened, so that the gas hydration agent enters a gas-liquid separator and then enters a compressor for compression, the concentrated solution in the liquid storage device enters a condenser for heat exchange with the high-temperature gas hydration agent, on one hand, the gas hydration agent is condensed, on the other hand, the temperature of the solution is increased, and then the concentrated solution is mixed with the solution at the outlet of a heat source tower through the electromagnetic valve IV and enters a heat pump unit for heat release.
3. The heat source tower heat pump system for realizing solution regeneration based on a hydrate method according to claim 1, wherein: the water temperature returned from the hydrate decomposer is higher, the electromagnetic valve eight is closed, the solution enters the plate heat exchanger through the water pump I and the electromagnetic valve seven, the electromagnetic valve III is closed, the solution at the outlet of the heat source tower enters the plate heat exchanger through the electromagnetic valve II, the solution and the water exchange heat in the plate heat exchanger, the solution is heated through the electromagnetic valve I after the temperature of the solution rises, the water at the outlet of the plate heat exchanger is cooled, then the solution is heated through the heat accumulator, the water is heated to the hydrate decomposer after the temperature rises, the heat is provided for the hydrate decomposition, when the concentration of the solution is higher, the solution concentration process is stopped, the electromagnetic valve nine is opened, the water at the outlet of the heat accumulator directly enters the plate heat exchanger through the water pump I and the electromagnetic valve seven, the heat exchange is carried out between the solution and the solution, and then the heat is absorbed through the heat accumulator.
4. The heat source tower heat pump system for realizing solution regeneration based on a hydrate method according to claim 1, wherein: the hydrating agent adopts R141b and C 3 H 8 Or CO 2 。
5. The heat source tower heat pump system for realizing solution regeneration based on a hydrate method according to claim 1, wherein: working medium of the heat source tower system adopts NaCl solution and CaCl 2 A solution.
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| CN109824106B (en) * | 2019-03-18 | 2021-10-15 | 大连理工大学 | Normal-pressure continuous seawater desalination system based on hydrate method and application method thereof |
| CN113175767B (en) * | 2021-04-26 | 2022-08-26 | 常州大学 | Split type grid type refrigeration heating device based on hydrate effect |
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