CN205779057U - Closed combined cooling and power energy storage system - Google Patents

Abstract

The utility model provides a cold and electricity antithetical couplet of closed supplies energy storage system, include: the energy storage unit comprises an air bag, a compressor set and an air storage tank; the heat recovery unit comprises interstage coolers of all stages of compressors, a cold oil tank, a hot oil tank and interstage heat regenerators of all stages of turboexpanders; the energy release unit comprises a speed regulating valve, a turbo-expander set, a speed reducer, a generator, a grid-connected control cabinet and a cold air conditioner, the whole system is a closed circulation system, air is not required to be supplied from the outside, the air drying and purifying process is reduced, equipment investment and energy consumption are reduced, cold energy is output externally, cold energy is fully utilized for cold fire of exhaust air after expansion, cold-electricity combined supply is realized, the efficiency of the system is improved, and unstable and intermittent wind energy is converted into stable electric energy and cold energy to be output.

Description

A closed cooling and power cogeneration energy storage system

technical field

The utility model relates to the field of energy conversion and storage, in particular to a closed cooling and power supply energy storage system.

Background technique

Wind energy accounts for 42% of all renewable energy globally. At the same time, wind power technology also has a relatively large advantage in various renewable energy distributed power generation technologies in terms of technical maturity and economic benefits, so it is the fastest-growing new energy distributed power generation technology in the world. According to the prediction of China Renewable Energy Industry Association, by the end of 2020, the total installed capacity of wind power in China will exceed 300GW.

However, because wind energy is affected by natural conditions such as weather, geographical location, and airflow changes, it has the characteristics of great uncertainty, randomness, and intermittency. Costs have a huge impact. With the increasing scale of wind power, the compatibility between wind power and power grid will become more prominent, and feasible solutions are urgently needed to promote the large-scale utilization of wind power. Among many solutions to wind power grid integration, energy storage technology is recognized as the main way to fundamentally solve the problem of large-scale wind power grid integration. At present, energy storage technologies in domestic industrial technology mainly include pumped storage, compressed air energy storage (CAES), flywheel energy storage, electromagnetic energy storage and electrochemical energy storage. Among them, compressed air energy storage, as a new type of energy storage technology, has attracted more and more attention from scholars at home and abroad.

Compressed air energy storage technology uses the electric energy produced by intermittent renewable energy to drive the compressor unit to compress the air, store the electric energy in the form of high-pressure air, and release the high-pressure air to drive the expander to generate power when electric energy is needed. Since Stal Laval proposed the use of underground caverns to realize compressed air energy storage in 1949, scholars at home and abroad have carried out a lot of research and practical work on this, and two large power stations have been put into commercial use in Germany (Huntorf) and the United States (McIntosh) respectively. run. In addition, Japan, Italy, Israel and other countries also have compressed air energy storage power station projects under construction. However, most of the existing compressed air energy storage technologies are open cycles, and cannot provide cooling capacity, and the system cycle efficiency is not high.

Utility model content

In view of this, it is necessary to provide a closed cooling and power cogeneration energy storage system that converts unstable and intermittent wind energy into stable electrical energy and cold output.

In order to achieve the above object, the application adopts the following technical solutions:

A closed cooling and power cogeneration energy storage system, including: an energy storage unit, a heat recovery unit and an energy release unit;

The energy storage unit includes an air bag (21), a primary compressor (1), a secondary compressor (2), a tertiary compressor (3) and an air storage tank (9);

The heat recovery unit includes a primary cooler (4), a secondary cooler (5), a tertiary cooler (6), a cold oil tank (8), a hot oil tank (7), and a primary heat regenerator (10) , secondary regenerator (11) and tertiary regenerator (12);

The energy release unit includes a speed regulating valve (13), a first-stage turboexpander (14), a second-stage turboexpander (15), a third-stage turboexpander (16), a speed reducer (17), a power generation Machine (18), grid-connected control cabinet (19) and cold air conditioner (20);

The exhaust port of the air bag (21) is connected to the air inlet of the primary compressor (1), and the exhaust port of the primary compressor (1) is connected to the primary cooler (4) The air inlet of the primary cooler (4) is connected with the air inlet of the secondary compressor (2), and the air outlet of the secondary compressor (2) is connected with the air inlet of the secondary compressor (2). The air inlet of the secondary cooler (5) is connected, the exhaust port of the secondary cooler (4) is connected with the air inlet of the three-stage compressor (3), and the three-stage compressor ( 3) the exhaust port is connected to the air inlet of the tertiary cooler (6), and the exhaust port of the tertiary cooler (6) is connected to the air inlet of the air storage tank (9), To form a closed flow channel for the energy storage stage;

The exhaust port of the air storage tank (9) is connected to the air inlet of the speed control valve (13), and the exhaust port of the speed control valve (13) is connected to the first-stage turbo expander (14 ), the air inlet of the first-stage turboexpander (14) is connected with the air inlet of the first-stage regenerator (10), and the first-stage regenerator (10) The exhaust port is connected to the air inlet of the secondary regenerator (11), and the exhaust port of the secondary regenerator (11) is connected to the air inlet of the secondary turbo expander (15). connected, the exhaust port of the two-stage turboexpander (15) is connected with the air inlet of the three-stage regenerator (12), and the exhaust port of the three-stage regenerator (12) is connected with the cold air The air inlet of the air conditioner (20) is connected, the air outlet of the cold wind air conditioner (20) is connected with the air inlet of the air bag (21), and the above air flow path constitutes a closed flow path in the energy release stage;

The heat transfer oil in the cold oil tank (8) and the hot oil tank (7) forms the tube side and the described primary cooler (4), secondary cooler (5) and tertiary cooler (6) Internal circulation reciprocating flow is performed in the tube side formed by the first-stage turboexpander (14), the second-stage turboexpander (15), and the third-stage turboexpander (16);

The output shafts of the one-stage turboexpander (14), the two-stage turboexpander (15), and the three-stage turboexpander (16) are connected with the high-speed shaft of the speed reducer (17) through a coupling , the input shaft of the generator (18) is connected to the low-speed output shaft of the speed reducer (17) through a coupling, and the electric energy generated by the generator (18) is input into the grid through the grid-connected control cabinet 19.

In some embodiments, the air bag is a normal-pressure and normal-temperature air storage bag for storing dry and clean air.

In some embodiments, the compressor unit composed of the first-stage compressor (1), the second-stage compressor (2), and the third-stage compressor is a multistage centrifugal compressor, or a multistage axial compressor, or Any combination of the above two structures.

In some embodiments, the primary cooler (4), secondary cooler (5), tertiary cooler (6), primary regenerator (10), secondary regenerator (11) and The third-stage regenerator (12) is any one of a shell-and-tube heat exchanger, a casing heat exchanger, and a plate-fin heat exchanger.

In some embodiments, both the cold oil tank (8) and the hot oil tank (7) are normal pressure oil tanks, and there is heat transfer oil as a heat storage medium inside.

In some embodiments, the speed regulating valve is a single throttle valve or multiple throttle valves connected in parallel.

In some embodiments, the turboexpander unit composed of the one-stage turboexpander (14), the two-stage turboexpander (15), and the three-stage turboexpander (16) is a multi-stage radial axial flow type An expander, or a multi-stage axial flow expander, or any combination of the above two structures.

In some embodiments, the speed reducer (17) is a multi-stage parallel shaft structure or a multi-stage planetary gear structure.

In some embodiments, the heat exchange structure in the cold air conditioner (20) is a coiled tube type or a fin type; the medium is a wind-wind type, or a wind-water type, or any combination of the above two structures.

In some embodiments, the pressure of the high-pressure air in the air storage tank (9) is 3-10MPa, the exhaust flow rate is 6000-100000Nm3/h, and the temperature of the expanded gas at each stage is 80-120°C after reheating. The exhaust gas temperature of the stage is -5~10℃; the installed power generation capacity of the system is 0.5~10MW, and the output cooling capacity is 20~400KW.

The utility model adopts the above-mentioned technical scheme, and its beneficial effects are:

The closed cooling and power supply energy storage system provided by the utility model includes: an energy storage unit, a heat recovery unit and an energy release unit, the energy storage unit includes an air bag, a compressor unit, and an air storage tank; the heat recovery unit It includes interstage coolers of compressors at all levels, cold oil tanks, hot oil tanks, and interstage regenerators of turboexpanders at all levels; the energy release unit includes speed regulating valves, turboexpander units, speed reducers, generators, and Network control cabinet and cold air conditioner, the whole system is a closed cycle system, no external air supply is required, which reduces the process of air drying and purification, equipment investment and energy consumption, and at the same time outputs cooling capacity to the outside, making full use of the exhausted air after expansion Cooling and heating use realizes the combined cooling and power supply, improves the efficiency of the system, and realizes the conversion of unstable and intermittent wind energy into stable electrical energy and cooling capacity output.

Description of drawings

Fig. 1 is a schematic structural diagram of a closed cooling and power cogeneration energy storage system provided by the present invention.

Among them: primary compressor (1), secondary compressor (2), tertiary compressor (3), primary cooler (4), secondary cooler (5), tertiary cooler (6), Hot oil tank (7), cold oil tank (8), air storage tank (9), third-stage regenerator (10), second-stage regenerator (11), first-stage regenerator (12), speed control valve ( 13), one-stage turboexpander (14), two-stage turboexpander (15), three-stage turboexpander (16), reducer (17), generator (18), grid-connected control cabinet ( 19), cold wind air conditioner (20), air bag (21).

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, but should not be construed as limiting the present utility model.

In the description of the present utility model, the orientation or positional relationship indicated by the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom" etc. are based on the attached The orientation or positional relationship shown in the figure is only for the convenience of describing the utility model and does not require the utility model to be constructed and operated in a specific orientation, so it cannot be construed as a limitation of the utility model.

Please refer to FIG. 1 , which is a schematic structural diagram of a closed cooling and power energy storage system 100 provided by the present invention, including: an energy storage unit, a heat recovery unit and an energy release unit.

The energy storage unit includes an air bag (21), a primary compressor (1), a secondary compressor (2), a tertiary compressor (3) and an air storage tank (9).

The heat recovery unit includes a primary cooler (4), a secondary cooler (5), a tertiary cooler (6), a cold oil tank (8), a hot oil tank (7), and a primary heat regenerator (10) , a secondary regenerator (11) and a tertiary regenerator (12).

The energy release unit includes a speed regulating valve (13), a first-stage turboexpander (14), a second-stage turboexpander (15), a third-stage turboexpander (16), a speed reducer (17), a power generation machine (18), grid-connected control cabinet (19) and cold air conditioner (20).

in,

The exhaust port of the air bag (21) is connected to the air inlet of the primary compressor (1), and the exhaust port of the primary compressor (1) is connected to the primary cooler (4) The air inlet of the primary cooler (4) is connected with the air inlet of the secondary compressor (2), and the air outlet of the secondary compressor (2) is connected with the air inlet of the secondary compressor (2). The air inlet of the secondary cooler (5) is connected, the exhaust port of the secondary cooler (4) is connected with the air inlet of the three-stage compressor (3), and the three-stage compressor ( 3) the exhaust port is connected to the air inlet of the tertiary cooler (6), and the exhaust port of the tertiary cooler (6) is connected to the air inlet of the air storage tank (9), To form a closed flow channel for the energy storage stage;

The exhaust port of the air storage tank (9) is connected to the air inlet of the speed control valve (13), and the exhaust port of the speed control valve (13) is connected to the first-stage turbo expander (14 ), the air inlet of the first-stage turboexpander (14) is connected with the air inlet of the first-stage regenerator (10), and the first-stage regenerator (10) The exhaust port is connected to the air inlet of the secondary regenerator (11), and the exhaust port of the secondary regenerator (11) is connected to the air inlet of the secondary turbo expander (15). connected, the exhaust port of the two-stage turboexpander (15) is connected with the air inlet of the three-stage regenerator (12), and the exhaust port of the three-stage regenerator (12) is connected with the cold air The air inlet of the air conditioner (20) is connected, the air outlet of the cold wind air conditioner (20) is connected with the air inlet of the air bag (21), and the above air flow path constitutes a closed flow path in the energy release stage;

The heat transfer oil in the cold oil tank (8) and the hot oil tank (7) forms the tube side and the described primary cooler (4), secondary cooler (5) and tertiary cooler (6) Internal circulation reciprocating flow is performed in the tube side formed by the first-stage turboexpander (14), the second-stage turboexpander (15), and the third-stage turboexpander (16);

The output shafts of the one-stage turboexpander (14), the two-stage turboexpander (15), and the three-stage turboexpander (16) are connected with the high-speed shaft of the speed reducer (17) through a coupling , the input shaft of the generator (18) is connected to the low-speed output shaft of the speed reducer (17) through a coupling, and the electric energy generated by the generator (18) is input into the grid through the grid-connected control cabinet 19.

It can be understood that during the energy storage process of the above-mentioned closed-type cogeneration energy storage system, the compressor unit formed by the first-stage compressor (1), the second-stage compressor (2), and the third-stage compressor (3) utilizes wind energy, solar energy Wait for the renewable intermittent energy source to compress the dry and clean atmospheric air after treatment in the air bag (21) into high-pressure air and store it in the air storage tank (9). At the same time, because the energy storage process and the energy release process are not carried out at the same time, in order to improve the power generation efficiency of the system when the compressor unit is cooling between stages, it is necessary to store the heat of compression of the outlet gas of each stage compressor with heat transfer oil as the heat storage medium. In the hot oil tank (7); during the energy release process, the air storage tank (9) releases high-pressure air, and the air pressure is reduced to the first-stage turbo expander (14), the second Stage turbo expander (15), three-stage turbo expander (16) inlet design pressure, maintain gas flow constant simultaneously. Then, the gas fully exchanges heat with the high-temperature heat transfer oil from the hot oil tank (7) in each stage of the regenerator, increases the inlet temperature and enthalpy of each stage of the expander, and performs expansion work. The high-temperature heat transfer oil flows back to the cold oil after completing the heat exchange, waiting for the next energy storage process to store heat. The expanded normal-pressure low-temperature gas flows through the cold air conditioner (20) to provide cold air for the room or cooling capacity for the cold storage. Finally, the air flows back into the air bladder. Therefore, the overall process is a closed cycle that does not require external air supply, reducing the process of air drying and purification, and at the same time converting unstable and intermittent wind and solar energy into stable electrical energy and cooling output, realizing cold power Combined energy storage device.

Preferably, the air bag (21) is an air storage bag at normal pressure and temperature, used to store dry and clean air.

Preferably, the compressor unit composed of the first-stage compressor (1), the second-stage compressor (2), and the three-stage compressor is a multistage centrifugal compressor, or a multistage axial flow compressor, or both of the above-mentioned Any combination of structures.

Preferably, the primary cooler (4), secondary cooler (5), tertiary cooler (6), primary regenerator (10), secondary regenerator (11) and tertiary regenerator The heat exchanger (12) is any one of a shell-and-tube heat exchanger, a casing heat exchanger, and a plate-fin heat exchanger.

Preferably, both the cold oil tank (8) and the hot oil tank (7) are atmospheric pressure oil tanks, and there is heat-storage medium and heat-conducting oil inside.

Preferably, the speed regulating valve (13) is a single throttle valve or a plurality of throttle valves connected in parallel.

Preferably, the turboexpander unit composed of the one-stage turboexpander (14), the two-stage turboexpander (15), and the three-stage turboexpander (16) is a multistage radial axial flow expander, Or a multi-stage axial flow expander, or any combination of the above two structures.

Preferably, the speed reducer (17) is a multi-stage parallel shaft structure or a multi-stage planetary gear structure.

Preferably, the heat exchange structure in the cold air conditioner (20) is a coiled tube type or a fin type; the medium is a wind-wind type, or a wind-water type, or any combination of the above two structures.

Preferably, the pressure of the high-pressure air in the air storage tank (9) is 3-10 MPa, the exhaust flow rate is 6,000-100,000 Nm3/h, and the temperature of the expanded gas at each stage is 80-120° C. The temperature is -5～10℃; the installed power generation capacity of the system is 0.5～10MW, and the output cooling capacity is 20～400KW.

The closed cooling and power supply energy storage system provided by the utility model is a closed circulation system, which does not require external air supply, reduces the process of air drying and purification, equipment investment and energy consumption, and at the same time outputs cooling capacity to make full use of The cooling and heating of the exhausted air after expansion realizes the combined cooling and power supply, improves the efficiency of the system, and realizes the conversion of unstable and intermittent wind energy into stable electrical energy and cooling capacity output.

Although the utility model has been described with reference to the current preferred embodiment, those skilled in the art should understand that the above-mentioned preferred embodiment is only used to illustrate the utility model, not to limit the protection scope of the utility model, any Any modification, equivalent replacement, improvement, etc. made within the spirit and principle scope of the present utility model shall be included in the protection scope of the present utility model.

Claims (10)

1. The utility model provides a closed combined cooling and power energy storage system which characterized in that includes: the energy storage unit, the heat regeneration unit and the energy release unit;

the energy storage unit comprises an air bag (21), a primary compressor (1), a secondary compressor (2), a tertiary compressor (3) and an air storage tank (9);

the heat recovery unit comprises a primary cooler (4), a secondary cooler (5), a tertiary cooler (6), a cold oil tank (8), a hot oil tank (7), a primary heat recovery device (10), a secondary heat recovery device (11) and a tertiary heat recovery device (12);

the energy release unit comprises a speed regulating valve (13), a primary turbine expander (14), a secondary turbine expander (15), a tertiary turbine expander (16), a speed reducer (17), a generator (18), a grid-connected control cabinet (19) and a cold air conditioner (20);

an exhaust port of the air bag (21) is connected with an air inlet of the primary compressor (1), an exhaust port of the primary compressor (1) is connected with an air inlet of the primary cooler (4), an exhaust port of the primary cooler (4) is connected with an air inlet of the secondary compressor (2), an exhaust port of the secondary compressor (2) is connected with an air inlet of the secondary cooler (5), an exhaust port of the secondary cooler (4) is connected with an air inlet of the tertiary compressor (3), an exhaust port of the tertiary compressor (3) is connected with an air inlet of the tertiary cooler (6), and an exhaust port of the tertiary cooler (6) is connected with an air inlet of the air storage tank (9) to form a closed flow passage in an energy storage stage;

the exhaust port of the air storage tank (9) is connected with the air inlet of the speed regulating valve (13), the exhaust port of the speed regulating valve (13) is connected with the air inlet of the first-stage turbo expander (14), the exhaust port of the primary turbine expander (14) is connected with the air inlet of the primary heat regenerator (10), the exhaust port of the primary regenerator (10) is connected with the air inlet of the secondary regenerator (11), the exhaust port of the secondary heat regenerator (11) is connected with the air inlet of the secondary turbo expander (15), the exhaust port of the secondary turbine expansion machine (15) is connected with the air inlet of the tertiary heat regenerator (12), the exhaust port of the three-stage heat regenerator (12) is connected with the air inlet of the cold air conditioner (20), the exhaust port of the cold air conditioner (20) is connected with the air inlet of the air bag (21), and the air channels form a closed channel in an energy release stage;

the heat conducting oil in the cold oil tank (8) and the hot oil tank (7) flows in a reciprocating manner in an internal circulation mode in a tube pass formed by the primary cooler (4), the secondary cooler (5) and the tertiary cooler (6) and a tube pass formed by the primary turboexpander (14), the secondary turboexpander (15) and the tertiary turboexpander (16);

the output shafts of the first-stage turbo expander (14), the second-stage turbo expander (15) and the third-stage turbo expander (16) are connected with the high-speed shaft of the speed reducer (17) through a coupler, the input shaft of the generator (18) is connected with the low-speed output shaft of the speed reducer (17) through a coupler, and electric energy generated by the generator (18) is input into a power grid through a grid-connected control cabinet (19).

2. The closed combined cooling and power energy storage system according to claim 1, wherein the air bag is a normal-pressure normal-temperature air storage bag for storing dry and clean air.

3. The closed combined cooling and power energy storage system according to claim 1, wherein the compressor unit formed by the first-stage compressor (1), the second-stage compressor (2) and the third-stage compressor is a multi-stage centrifugal compressor, a multi-stage axial compressor or any combination of the two structures.

4. The closed cogeneration energy storage system of claim 1, wherein said primary cooler (4), secondary cooler (5), tertiary cooler (6), primary regenerator (10), secondary regenerator (11) and tertiary regenerator (12) are any one of a shell-and-tube heat exchanger, a double-tube heat exchanger, and a plate-fin heat exchanger.

5. The closed combined cooling and power energy storage system according to claim 1, wherein the cold oil tank (8) and the hot oil tank (7) are both normal pressure oil tanks, and heat transfer oil as a heat storage medium is stored therein.

6. The closed combined cooling and power energy storage system according to claim 1, wherein the speed regulating valve is a single throttle valve or a plurality of throttle valves are connected in parallel.

7. The closed combined cooling and power energy storage system according to claim 1, wherein the turbo-expander set formed by the one-stage turbo-expander (14), the two-stage turbo-expander (15) and the three-stage turbo-expander (16) is a multi-stage radial-axial flow type expander or a multi-stage axial-flow type expander or any combination of the two structures.

8. The closed cogeneration energy storage system of claim 1 wherein said reducer (17) is of a multi-stage parallel shaft configuration or a multi-stage planetary gear configuration.

9. The closed combined cooling and power energy storage system according to claim 1, wherein the heat exchange structure in the cold air conditioner (20) is a wound tube type or a fin type; the medium is wind-wind type, or wind-water type, or the arbitrary combination of the above two structures.

10. The closed combined cooling and power energy storage system according to any one of claims 1-9, wherein the pressure of the high-pressure air in the air storage tank (9) is 3-10 MPa, the exhaust flow is 6000-100000 Nm3/h, the temperature of the expanded gas after each stage of heat recovery is 80-120 ℃, and the exhaust temperature of the last stage is-5-10 ℃; the system has the installed generating capacity of 0.5-10 MW and the output cold energy of 20-400 KW.