CN115751756A - CO generating electricity by high-pressure gas storage 2 Secondary refrigerant energy storage and cooling system - Google Patents

Abstract

CO generating electricity by high-pressure gas storage ₂ A secondary refrigerant energy storage and cooling system relates to a cooling system. The compressor, the condenser, the refrigerant reservoir and the electronic expansion valve are sequentially connected, the compressor is connected with the condensation evaporator, the electronic expansion valve is connected with the condensation evaporator, and CO is introduced into the condenser ₂ The liquid outlet of the liquid storage tank is connected with the liquid pump and then is connected with CO through the main path and the bypass ₂ The air pipe inlet of the liquid storage tank is connected, the cold evaporator is arranged in the main path, and the bypass is arrangedElectromagnetic regulating valve, CO ₂ The liquid inlet of the liquid storage tank is connected with the condensing evaporator, and CO ₂ The outlet of the air pipe of the liquid storage tank is connected with the condensing evaporator, and the air compressor is used for compressing CO ₂ Gas pipe outlet and CO of liquid storage tank ₂ The air pipe inlet of the high-pressure air storage tank is connected with CO ₂ The outlet of the air pipe of the high-pressure air storage tank is connected with the condensation evaporator through an electromagnetic regulating valve and a power generation mechanism. External CO ₂ The high-pressure gas storage tank realizes the energy storage effect, the system runs safely and stably, and the high-pressure CO is fully utilized ₂ And the gas is used for generating power, so that the energy efficiency utilization rate is improved.

Description

A CO2 brine energy storage cooling system using high-pressure gas storage for power generation

technical field

The invention relates to a cooling system, in particular to a _CO2 brine energy storage cooling system using high-pressure gas storage for power generation, and belongs to the technical field of research and development of energy efficiency utilization of cooling systems.

Background technique

In the field of cooling systems, there are common problems of peak and valley electricity prices, day and night operating efficiency and cooling demand differences: during the day, the refrigeration cycle efficiency is low, the electricity price is high, but the cooling demand is large; at night, the refrigeration cycle efficiency is high , the price of electricity is lower, but the demand for cooling is indeed small. Therefore, energy storage technology is usually used to solve this kind of mismatch between supply and demand capabilities and the large gap between operating costs and benefits, that is, high operating efficiency at night, low operating costs, hours of cooling demand, more cooling capacity for storage, and during the day The cooling capacity stored at night can be supplemented to reduce the cooling demand during the day and reduce the cost.

In view of the above reasons, _the present invention increases the _amount of CO in the brine system to achieve the energy storage effect by connecting an external CO ₂ high- _pressure gas storage tank. It is necessary to reduce the pressure before the evaporator, and although the process of reducing the pressure with the conventional pressure reducing valve is simple, the energy generated by the pressure drop is not utilized, which is not conducive to the improvement of energy efficiency utilization. Therefore, it is necessary to make full use of the high-pressure CO ₂ gas generated during the operation of the system to generate electricity while connecting an external CO ₂ high-pressure gas storage tank to ensure the pressure is stable, so as to further improve the energy efficiency utilization of the system, which has a great impact on the energy efficiency utilization of the cooling system. And the use of economy is of great significance.

Contents of the invention

In order to solve the deficiencies in the background technology, the present invention provides a CO ₂ brine energy storage cooling system that uses high-pressure gas storage to generate electricity, which realizes energy storage through an external CO ₂ high-pressure gas storage tank, and improves the safety and stability of the system operating capacity, and make full use of the released high-pressure CO ₂ gas for power generation, improving energy efficiency utilization.

In order to achieve the above object, the present invention adopts the following technical solutions: a _CO2 brine energy storage cooling system using high-pressure gas storage to generate electricity, including a refrigerant loop, a _CO2 brine loop and a power generation mechanism, two In addition to the shared condensing evaporator, the refrigerant loop also includes a compressor, a condenser, a refrigerant liquid receiver, and an electronic expansion valve EEV. The outlet of the compressor, the condenser, and the refrigerant storage The liquid tank and the electronic expansion valve EEV are sequentially connected, the inlet of the compressor is connected to the refrigerant outlet of the condensing evaporator, the electronic expansion valve EEV is connected to the refrigerant inlet of the condensing evaporator, and the _CO2 refrigerant ring The road also includes a _CO2 liquid pump, a cold evaporator, a _CO2 liquid storage tank, a _CO2 high-pressure gas storage tank and an air compressor, the liquid pipe outlet of the _CO2 liquid storage tank is connected with the _CO2 liquid pump, and the The _CO2 liquid pump is finally connected to the air pipe inlet of the _CO2 liquid storage tank through the main road and the bypass. The cold evaporator is used, the bypass is arranged with an electromagnetic regulating valve, the liquid pipe inlet of the _CO2 liquid storage tank is connected to the CO2 condensation pipe outlet of the condensing evaporator, and the gas pipe outlet of the _{CO2 liquid} storage tank is connected to the condensing evaporator The _CO2 condensing pipe inlet is connected, and the air compressor connects the gas pipe outlet of the _CO2 liquid storage tank with the gas pipe inlet of the CO2 high-pressure gas storage tank, and the gas pipe outlet of the _CO2 high _- pressure gas storage tank passes through the electromagnetic regulating valve in turn. And the _CO condensing pipe inlet of the generating mechanism is connected with the condensing evaporator, and the generating mechanism includes a turbine and a generator, and the inlet and outlet of the turbine are connected to the electromagnetic regulating valve and the electromagnetic regulating valve at the gas pipe outlet of the CO high _- pressure gas storage tank Between the inlets of the CO ₂ condensing pipes of the condensing evaporator, the rotating shaft of the turbine is connected to drive the generator.

Compared with the prior art, the beneficial effects of the present invention are: the present invention is provided with an external _CO2 high-pressure gas storage tank, which can _realize a good energy storage effect. The CO ₂ gas released from the gas storage tank increases the liquid CO ₂ in the CO ₂ liquid storage tank, so that the liquid CO ₂ can store the cooling capacity to achieve the function of energy storage, and the stored cooling capacity can be shut down when the refrigerant loop fails In addition, during the energy storage process, the high-pressure CO 2 gas released from the CO ₂ high-pressure gas storage tank is fully utilized to generate _{electricity through the additional power generation mechanism, and the high-pressure CO 2 gas} drives the turbine to do power and drive the generator to rotate to generate electricity , can be used for power consumption in the system, reduce power consumption of the system, improve energy efficiency utilization, and can also be connected to a battery for storage for other purposes.

Description of drawings

Fig. 1 is a schematic diagram of a CO ₂ brine energy storage cooling system utilizing high-pressure gas storage for power generation according to the present invention.

Detailed ways

The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of them. Based on the present invention All other embodiments obtained by persons of ordinary skill in the art without creative efforts, all belong to the scope of protection of the present invention.

As shown in Figure 1, a CO ₂ brine energy storage cooling system using high-pressure gas storage for power generation includes a refrigerant loop, a CO ₂ brine loop, and a power generation mechanism. In addition to the evaporator 5, the refrigerant loop also includes a compressor 1, a condenser 2, a refrigerant liquid reservoir 3 and an electronic expansion valve EEV4, the outlet of the compressor 1, the condenser 2, the refrigerant liquid storage The compressor 3 and the electronic expansion valve EEV4 are connected in sequence through pipelines, the inlet of the compressor 1 is connected with the refrigerant outlet of the condensing evaporator 5 through a pipeline, and the electronic expansion valve EEV4 is connected with the refrigerant inlet of the condensing evaporator 5 through a pipeline , the _CO2 brine loop also includes a _CO2 liquid pump 6, a cold evaporator 9, a _CO2 liquid storage tank 10, a _CO2 high-pressure gas storage tank 11 and an air compressor 12, and the _CO2 liquid storage The outlet of the liquid pipe of the tank 10 is connected with the _CO2 liquid pump 6 through a pipeline, and the _CO2 liquid pump 6 is finally connected with the air pipe inlet of the _CO2 liquid storage tank 10 through a main road and a bypass, and the main road includes parallel multiple Each of the branches is arranged with an electromagnetic regulating valve 7, a shut-off valve 8, and the cold evaporator 9 in sequence, and the bypass is arranged with an electromagnetic regulating valve 7, and the liquid pipe of the _CO2 liquid storage tank 10 The inlet is connected with the _CO condensing tube outlet of the condensing evaporator 5 through a pipeline, the gas pipe outlet _of the _CO liquid storage tank 10 is connected with the CO condensing tube inlet of the condensing evaporator 5 through a pipeline, and the air compressor 12 passes the CO through the pipeline. _2. The gas pipe outlet of the liquid storage tank 10 is connected to the gas pipe inlet of the CO2 high-pressure gas storage tank 11, and the gas pipe _outlet of the _CO2 high-pressure gas storage tank 11 passes through the pipeline in turn through the electromagnetic regulating valve 7 and the connection between the power generation mechanism and the condensation evaporator 5. _The CO condensing pipe inlet is connected, and further, the air compressor 12 and the CO ₂ high-pressure air tank 11 The electromagnetic regulating valve 7 of the gas pipe outlet is connected with a control circuit, and the control circuit is connected with a pressure sensor, and the pressure sensor is set In the _CO2 liquid storage tank 10, the internal pressure of the _CO2 liquid storage tank 10 is detected by the pressure sensor and compared with the set value. If the pressure is lower than the set value, the air compressor 12 is closed and the electromagnetic regulating valve 7 is opened. When the set value is set, the air compressor 12 is turned on and the electromagnetic regulating valve 7 is closed, so as to realize the pressure stabilization of the CO liquid storage tank 10 in combination with the _CO high-pressure gas storage tank 11. _The power generation mechanism includes a turbine 13 and a generator 14 , the inlet and outlet of the turbine 13 are connected between the electromagnetic regulating valve 7 at the outlet of the _CO2 high-pressure air tank 11 gas pipe and the _CO2 condensation pipe inlet of the condensing evaporator 5, and the rotating shaft of the turbine 13 passes through the transmission rod 15 The generator 14 is connected to drive.

The specific operation process of the cooling system of the present invention is as follows:

1. Refrigerant loop operation process

The high-temperature and high-pressure refrigerant gas discharged from the compressor 1 is converted into a low-temperature and high-pressure refrigerant gas-liquid mixed fluid after heat exchange by the condenser 2, and flows into the refrigerant liquid receiver 3, and the refrigerant liquid in the refrigerant liquid receiver 3 After the electronic expansion valve EEV4 becomes a low-temperature and low-pressure refrigerant liquid, it enters the condensing evaporator 5 to exchange heat with _CO2 and absorb heat to become a refrigerant gas, and finally flows into and passes through the compressor 1 to do work to become a high-temperature and high-pressure refrigerant gas .

2. CO ₂ refrigerant loop user cooling process

The CO ₂ liquid in the CO ₂ liquid storage tank 10 works through the CO ₂ liquid pump 6 and is divided into a main road and a bypass. After endothermic gasification, the _CO2 gas-liquid mixed fluid at the outlet of the cold evaporator 9 flows into the _CO2 liquid storage tank 10, and the bypass flows into the _CO2 liquid storage tank 8 after passing through the electromagnetic regulating valve 7.

3. CO ₂ condensate liquefaction process in CO ₂ refrigerant loop

The CO ₂ gas in the CO ₂ liquid storage tank 10 is pressurized by the air compressor 12 and sent into the CO ₂ high-pressure gas storage tank ₁₁ , and the high-pressure CO 2 gas in the CO ₂ high-pressure gas storage tank 11 flows through the electromagnetic regulating valve 7 and enters the turbine 13 After pushing the turbine 13 to do work to turn it into low-pressure CO ₂ gas, it mixes with the low-pressure CO ₂ gas directly coming out of the CO ₂ liquid storage tank 10 and enters the condensing evaporator 5 to absorb cold energy and liquefy into CO ₂ liquid, which finally flows into the CO ₂ storage tank. In the liquid tank 10.

4. Operation process of power generation mechanism

When storing energy, the cooling capacity of the refrigerant loop is greater than the cooling capacity of the user, that is, the liquefied CO 2 produced by the condensing evaporator 5 is more than the gaseous CO ₂ produced by the cold evaporator ₉ , so that the CO ₂ liquid storage tank 10 The gaseous _CO2 decreases and the pressure drops. After the pressure sensor installed in the _CO2 liquid storage tank 10 detects that the pressure is lower than the set value, the air compressor 12 is closed, and the opening of the electromagnetic regulating valve 7 is adjusted to store _CO2 at high pressure. The high-pressure _CO2 gas in the tank 11 is depressurized by the turbine 13 and enters the condensing evaporator 5. The gas _CO2 absorbs the cooling capacity of the refrigerant loop and becomes liquefied _{CO2 and} flows into the _CO2 liquid storage tank 10. The incompletely liquefied gas CO ₂ together into the CO ₂ storage tank 10 to ensure its pressure is stable, while the liquid CO ₂ in the CO ₂ storage tank 10 is used to store cold energy, and the high-pressure CO ₂ gas flowing out from the CO ₂ high-pressure gas storage tank 11 pushes the turbine 13 to do work , the turbine 13 drives the generator 14 to rotate through the transmission rod 15 to generate electricity, and the output electric energy can be used to provide electric energy for the compressor 1, the CO _liquid pump 6 or the air compressor 12 of the cooling system of the present invention, and can also be stored by a storage battery , then the storage battery can be used as a regulating power supply for the system, or for other purposes.

It will be obvious to a person skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, but that it can be implemented in other configurations without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents are included in the invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (2)

1. CO generating electricity by high-pressure gas storage ₂ Secondary refrigerant energy storage cooling system, its characterized in that: comprising a refrigerant loop, CO ₂ The two loops comprise a common condensation evaporator (5), a compressor (1), a condenser (2), a refrigerant liquid storage device (3) and an electronic expansion valve EEV (4), wherein an outlet of the compressor (1), the condenser (2), the refrigerant liquid storage device (3) and the electronic expansion valve EEV (4) are sequentially connected, an inlet of the compressor (1) is connected with a refrigerant outlet of the condensation evaporator (5), the electronic expansion valve EEV (4) is connected with a refrigerant inlet of the condensation evaporator (5), and the CO is generated by the CO ₂ The coolant loop further comprises CO ₂ Liquid pump (6), cold evaporator (9), CO ₂ Liquid storage tank (10), CO ₂ A high pressure gas storage tank (11) and an air compressor (12), the CO ₂ Liquid outlet of liquid storage tank (10) and CO ₂ A liquid pump (6), the CO ₂ The liquid pump (6) is finally connected with CO through a main path and a bypass ₂ The trachea inlet of liquid storage pot (10) is connected, the main road includes many parallelly connected branches and every the branch road has arranged solenoid operated valve (7), stop valve (8) in proper order and has reached with cold evaporimeter (9), solenoid operated valve (7), CO are arranged to the bypass, and CO ₂ The liquid inlet of the liquid storage tank (10) and CO of the condensation evaporator (5) ₂ Outlet connection of condenser tube, CO ₂ The gas pipe outlet of the liquid storage tank (10) and the CO of the condensation evaporator (5) ₂ The inlets of the condenser pipes are connected, and the air compressor (12) is used for compressing CO ₂ The outlet of the air pipe of the liquid storage tank (10) and CO ₂ The air pipe inlet of the high-pressure air storage tank (11) is connected, and the CO is ₂ The gas pipe outlet of the high-pressure gas storage tank (11) passes through the electromagnetic regulating valve (7), the power generation mechanism and the CO of the condensation evaporator (5) in sequence ₂ The inlet of the condensing pipe is connected, the power generation mechanism comprises a turbine (13) and a power generator (14), and the inlet and the outlet of the turbine (13) are connected with the CO ₂ CO of the electromagnetic regulating valve (7) and the condensing evaporator (5) at the outlet of the air pipe of the high-pressure air storage tank (11) ₂ And a rotating shaft of the turbine (13) is connected and drives the generator (14) between the inlets of the condensing pipes.

2. The CO of claim 1 for generating power by high pressure gas storage ₂ Secondary refrigerant energy storage cooling system, its characterized in that: the air compressor (12) and CO ₂ The electromagnetic regulating valve (7) at the outlet of the air pipe of the high-pressure air storage tank (11) is connected with a control circuit, the control circuit is connected with a pressure sensor, and the pressure sensor is arranged at the CO ₂ A liquid storage tank (10).

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