CN106091577A - The cryogenic liquefying air method of a kind of cold and heat combined supply type and system - Google Patents

Abstract

The present invention provides a heat energy supply method, a cold energy supply method, a heat energy supply system and a cold energy supply system, wherein the heat energy supply method comprises the following steps: Step 1: using electric energy to convert gaseous air into liquid air under low temperature and high pressure conditions; Step 2: Collect the heat energy released in the conversion process of Step 1; Step 3: Use the heat energy collected in Step 2 to supply heat energy, and use the waste cold and waste heat generated in the liquefied air energy storage technology to supply heat and cold energy, Improve energy utilization efficiency and avoid waste.

Description

A combined cooling and heating method and system for cryogenic liquefied air

technical field

The invention relates to the technical field of liquefied air energy storage, in particular to a heat energy supply method, a cold energy supply method, a heat energy supply system and a cold energy supply system using liquefied air.

Background technique

Cryogenic liquefied air energy storage technology refers to the use of electric energy for compressed air during the low load period of the grid, and the high-pressure sealing of the air in abandoned mines, subsidence subsea gas storage tanks, caves, expired oil and gas wells or newly built gas storage wells. The energy storage method releases compressed air during the peak period to drive the steam turbine to generate electricity. The liquid air energy storage system has the advantages of large energy storage capacity, long energy storage period, small footprint and does not depend on geographical conditions. During energy storage, the electric energy compresses, cools and liquefies the air, and at the same time stores the heat energy released during the process, which is used to heat the air during energy release; during energy release, the liquid air is pressurized and vaporized, driving the expansion generator set to generate electricity, and at the same time The cold energy of the process is stored and used to cool the air while storing energy. At present, the thermal energy and cold energy generated in the process of energy storage and energy release are often reused in the cycle of energy storage and energy release, while the surplus of thermal energy and cold energy is wasted. How to utilize the amount is a technical problem to be solved urgently by those skilled in the art.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to overcome the technical defect in the existing liquefied air energy storage technology that the surplus of heat energy and cold energy cannot be fully utilized, resulting in serious waste of energy.

In order to solve the above technical problems, the present invention provides a thermal energy supply method, comprising the following steps:

Step 1: Use electric energy to convert gaseous air into liquid air under low temperature and high pressure conditions;

Step 2: collecting the heat energy released during the conversion process of step 1;

Step 3: Use the heat energy collected in step 2 to supply heat energy.

In the above heat energy supply method, the step 3 is to realize the supply of heat energy by using heat energy to drive a heat pump.

In the above thermal energy supply method, the step 3 is to realize the supply of thermal energy by using thermal energy to heat the circulating water.

The present invention also provides a thermal energy supply system, using the above-mentioned thermal energy supply method, the system includes:

An electric motor, an air compressor unit, a liquefaction device, and a heat storage device, the motor is used to drive the air compressor unit and the liquefaction device to convert gaseous air into liquid air, and the heat storage device is used to collect the conversion process heat energy released in.

In the above heat energy supply system, the heat storage device is connected to a heat pump, and uses the heat energy stored inside to drive the heat pump to work, so as to realize heat energy supply.

In the above thermal energy supply system, the heat storage device is connected to the circulating water pipeline, so that the thermal energy stored in it can be transferred to the water in the circulating water pipeline, so as to realize the supply of thermal energy.

In the above-mentioned thermal energy supply system, the heat pump or the circulating water pipeline provides thermal energy supply to multiple thermal energy receiving ends, and a valve is arranged between each thermal energy receiving end, and the supply of thermal energy is controlled by opening or closing the valve. termination.

The present invention also provides a cold energy supply method based on the above heat energy supply method, comprising the following steps:

Step 4: Collect the liquid air prepared in Step 1;

Step 5: Convert the Yetai air into gaseous air under high temperature and high pressure conditions, and collect the cold energy released during the conversion process;

Step 6: Use the cold energy collected in step 5 to supply cold energy.

In the above cold energy supply method, the step 6 is to realize the supply of cold energy by using the cold energy to drive the refrigerator.

In the above thermal energy supply system, the step 6 is to realize the supply of cold energy by using cold energy to cool the circulating water.

The present invention also provides a cold energy supply system, using the above cold energy supply method, the system includes:

A liquid air storage device, a gasification device, an expansion unit, and a cold storage device. The liquid air stored in the liquid air storage device enters the expansion unit to perform work after being gasified by the gasification device. The energy storage device is used for The cold energy generated in the gasification process of the liquid air is collected.

In the above-mentioned cold energy supply system, the cold storage device is connected to the refrigerator, and uses the cold energy stored inside to drive the refrigerator to work, so as to realize the supply of cold energy.

In the above-mentioned cold energy supply system, the cold storage device is connected to the circulating water pipeline, so that the cold energy stored in it is transferred to the water in the circulating water pipeline, so as to realize the supply of cold energy.

In the above-mentioned cold energy supply system, the refrigerator or the circulating water pipeline provides cold energy supply to a plurality of cold energy receiving ends, and a valve is provided between each cold energy receiving end, by opening or closing the valve Control the supply and termination of cold energy.

The technical solution of the present invention has the following advantages:

1. In the thermal energy supply method provided by the present invention, thermal energy is generated by compressing gaseous air into liquid air, and the thermal energy is collected and stored, and then the collected and stored thermal energy is supplied to the thermal energy receiving end. In the existing liquefied air energy storage technology, the heat energy released in the energy storage stage is often collected and only used for heating during the gasification process of liquid air. In this embodiment, the remaining waste heat in the heat storage process is stored and used In order to supply heat energy to the receiving end, the utilization rate of energy is effectively improved, and heat energy loss and waste are avoided.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

Fig. 1 is the structural representation of thermal energy supply system of the present invention;

Fig. 2 is a structural schematic diagram of the cold energy supply system of the present invention.

Explanation of reference signs:

1-electric motor; 2-air compressor unit; 3-liquefaction device; 4-heat storage device; 5-heat pump; 6-liquid air storage device; 7-gasification device; 8-expansion unit; 9-cooling storage device.

detailed description

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

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.

Example 1

This embodiment provides a thermal energy supply method, including the following steps:

Step 1: Use electric energy to convert gaseous air into liquid air under low temperature and high pressure conditions;

Step 2: collecting the heat energy released during the conversion process of step 1;

Step 3: Use the heat energy collected in step 2 to supply heat energy.

The above steps are the core technical solution of this embodiment, generating thermal energy by compressing gaseous air into liquid air, collecting and storing the thermal energy, and supplying the collected and stored thermal energy to the thermal energy receiving end. In the existing liquefied air energy storage technology, the heat energy released in the energy storage stage is often collected and only used for heating during the gasification process of liquid air. In this embodiment, the remaining waste heat in the heat storage process is stored and used In order to supply heat energy to the receiving end, the utilization rate of energy is effectively improved, and heat energy loss and waste are avoided.

Further, in the above-mentioned thermal energy supply method, step 3 may be to drive the heat pump through thermal energy, and then transfer the energy to the thermal energy receiving end through the heat pump to complete the thermal energy supply; receiving end.

However, it should be noted that the supply methods of heat energy are not limited to the above two methods, and any medium suitable for supplying heat can be used to conduct heat energy to the receiving end.

Example 2

Referring to Fig. 1, the present embodiment provides a thermal energy supply system, using the supply method described in Embodiment 1, the system includes: a motor 1, an air compressor unit 2, a liquefaction device 3, and a heat storage device 4, the motor 1 It is used to drive the air compressor unit 2 and the liquefaction device 3 to convert gaseous air into liquid air, and the heat storage device 4 is used to collect heat energy released during the conversion process. Specifically, the air compressor unit 2 is preferably two groups, wherein the first group of air compressor unit is a low-pressure compressor unit, and the air compressed by the low-pressure compressor unit enters the air purification device, then passes through the second group of air compressor unit, and finally is liquefied Liquefaction was completed in unit 3. The heat storage device 4 can be a heat storage tank or the like, which is connected to each of the compressor units to absorb the heat energy generated during the air compression process, and finally release the heat energy stored in the heat storage device 4 to the heat energy receiving end.

Further, the heat storage device 4 is connected to the heat pump 5, and then the heat energy is supplied by means of the heat pump transferring energy to the heat receiving end; it is also possible to connect the circulating water pipeline so that the heat energy stored in it is transferred to the water in the circulating water pipeline, In order to realize the supply of heat energy.

In order to realize the single supply and joint supply functions of heat energy supply, in this embodiment, the heat pump 5 or the circulating water pipeline is used to provide heat energy supply to multiple heat energy receiving ends, and a valve is arranged between each heat energy receiving end, by opening Or close the valve to control the supply and termination of heat energy.

Example 3

This embodiment provides a cold energy supply method based on the heat energy supply method in Embodiment 1. Since the liquefied air energy storage technology is a cycle in which air is compressed into a liquid state and then expanded from a liquid state to a gas state, cold energy and heat energy The supplies are also preferably closely coupled to each other. The cold energy supply method of this embodiment includes the following steps:

Step 4: Collect the liquid air prepared in Step 1;

Step 5: Convert the Yetai air into gaseous air under high temperature and high pressure conditions, and collect the cold energy released during the conversion process;

Step 6: Use the cold energy collected in step 5 to supply cold energy.

Similar to the thermal energy supply method in Embodiment 1, in this embodiment, the cold energy generated during the liquid air vaporization process is collected, and then the collected cold energy is supplied to the receiving end of the cold energy, thereby completing the cold energy supply process .

Among them, it is preferable to use cold energy to drive the refrigerator, and then use the refrigerator to output cold energy to complete the cold energy supply; or it is also possible to use cold energy to cool the circulating water, and then use the circulating water to output cold energy to complete the cold energy supply .

Example 4

Referring to FIG. 2, this embodiment provides a cold energy supply system that uses the cold energy supply method described in Embodiment 3, the system comprising:

A liquid air storage device 6, a gasification device 7, an expansion unit 8 and a cold storage device 9, the liquid air stored in the liquid air storage device 6 enters the expansion unit 8 to perform work after being vaporized by the gasification device 7, The cold storage device 9 is used to collect the cold energy generated during the vaporization process of the liquid air.

The above embodiment is the core technical solution of this embodiment. After the liquid air in the liquid air storage device 6 passes through the gasification device 7, it enters the expansion unit 8 to perform work and returns to a gaseous state. The cold energy generated in this process is stored The energy device 9 collects the cold energy, and then outputs the cold energy through the cold storage device 9 to complete the supply of cold energy. And preferably, the expansion unit 8 is two sets of expansion units, one of which is a high-pressure expansion unit, and one group is a low-pressure expansion unit, and the cold storage device is connected with the high-pressure expansion unit and the low-pressure expansion unit respectively, thereby absorbing the gasification process of liquid air the cold energy released.

As a preferred embodiment, the cold storage device 9 is connected to the refrigerator, and uses the cold energy stored in it to drive the refrigerator to work, so as to realize the supply of cold energy; The cold energy is transferred to the water in the circulating water pipeline to realize the supply of cold energy.

In order to realize the single supply and joint supply functions of cold energy supply, in this embodiment, a refrigerator or the circulating water pipeline is used to provide cold energy supply to multiple cold energy receiving ends, and a A valve to control the supply and termination of cold energy by opening or closing the valve.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (14)

1. a heat energy supply method, it is characterised in that comprise the following steps:

Step 1: utilize electric energy that gaseous air is converted under the conditions of cryogenic high pressure liquid air；

Step 2: collect the heat energy of release in the conversion process of step 1；

Step 3: use the heat energy collected in step 2 to carry out the supply of heat energy.

Heat energy supply method the most according to claim 1, it is characterised in that:

Described step 3 is to realize the supply of heat energy by the way of using heat-driven heat pump.

Heat energy supply method the most according to claim 1, it is characterised in that:

Described step 3 is to realize the supply of heat energy by the way of using energy heats recirculated water.

4. a heat energy feed system, it is characterised in that:

The supply method of use heat energy according to any one of claim 1-3, described system includes:

Motor (1), air compressor unit (2), liquefying plant (3) and heat-storing device (4), described motor (1) is used for driving Dynamic described air compressor unit (2) and liquefying plant (3), gaseous air to be converted into liquid air, described heat-storing device (4) For collecting the heat energy of release in described conversion process.

Heat energy feed system the most according to claim 4, it is characterised in that:

Described heat-storing device (4) connects heat pump (5), and uses the heat-driven heat pump (5) of its internal reservoir to work, to realize heat The supply of energy.

Heat energy feed system the most according to claim 4, it is characterised in that:

Described heat-storing device (4) connects circulating water line, so that the heat energy stored in it passes to the water in circulating water line, with Realize the supply of heat energy.

7. according to the heat energy feed system described in claim 5 or 6, it is characterised in that:

Described heat pump (5) or described circulating water pipe road direction multiple heat energy receiving terminal provide heat energy supply, and accept with each heat energy Valve it is provided with, by opening or closing supply and the termination of described Valve controlling heat energy between end.

8. the cold energy supply method on the basis of the heat energy supply method according to any one of claim 1-3, its feature It is, comprises the following steps:

Step 4: collect the liquid air of preparation in step 1；

Step 5: described too air is converted under high-temperature and high-pressure conditions gaseous air, and collects release in this conversion process Cold energy；

Step 6: use the cold energy collected in step 5 to carry out the supply of cold energy.

Cold energy supply method the most according to claim 8, it is characterised in that:

Described step 6 is by using cold energy to drive refrigeration machine to realize the supply of cold energy.

Cold energy supply method the most according to claim 9, it is characterised in that:

Described step 6 is to realize the supply of cold energy by the way of using cold energy cooling circulating water.

11. 1 kinds of cold energy feed systems, use the cold energy supply method described in claim 8 or 9, and described system includes:

Liquid air storage device (6), gasification installation (7), expansion unit (8) and accumulator are put (9), and described liquid air stores The liquid air stored in device (6) enters the acting of described expansion unit (8), described storage after described gasification installation (7) gasifies Device for cooling (9) is for collecting the cold energy produced in described liquid air gasification.

12. cold energy feed systems according to claim 11, it is characterised in that:

Described accumulator is put (9) and is connected with refrigeration machine, and uses the cold energy of its storage inside to drive refrigeration machine work, cold to realize The supply of energy.

13. cold energy feed systems according to claim 11, it is characterised in that:

Described accumulator is put (9) and is connected circulating water line, so that the cold energy stored in it passes to the water in circulating water line, with Realize the supply of cold energy.

14. according to the cold energy feed system described in claim 12 or 13, it is characterised in that:

Described refrigeration machine or described circulating water pipe road direction multiple cold energy receiving terminal provide cold energy supply, and with each cold energy receiving terminal Between be provided with valve, by opening or closing supply and the termination of described Valve controlling cold energy.