Regenerative compressed air energy storage system and using method thereof

Patent metadata

Field	Value
Publication number	US-10995663-B2
Application number	US-201916522604-A
Country	US
Kind code	B2
Filing date	Jul 25, 2019
Priority date	Jul 25, 2018
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A regenerative compressed air energy storage system and a using method thereof. The system comprises a compressor unit, a high-temperature heat exchanger, a medium-temperature heat exchanger, an air storage chamber, a regulating valve, a medium-temperature regenerator, a high-temperature regenerator and an expander unit which are connected in sequence. The low-temperature side of the high-temperature heat exchanger, a high-temperature heat reservoir, a first valve, the high-temperature side of the high-temperature regenerator, a high-temperature cold reservoir and a second valve are connected in sequence. The low-temperature side of the medium-temperature heat exchanger, a medium-temperature heat reservoir, a third valve, the high-temperature side of the medium-temperature regenerator, a medium-temperature cold reservoir and a fourth valve are connected in sequence. A heating pipe inlet inside a compressor unit lubrication station communicates with the high-temperature cold reservoir through a high-temperature valve, and a heating pipe outlet communicates with of an intermediate cold reservoir.

First claim

What is claimed is:

1. A regenerative compressed air energy storage system, comprising an air storage chamber, a compressor unit, an expander unit, a compressor unit lubrication station, an expander unit lubrication station, and an electric motor connected to the compressor unit and a generator connected to the expander unit, wherein a heating pipe and a temperature sensor are disposed inside each of the compressor unit lubrication station and the expander unit lubrication station;
an outlet of the compressor unit communicates with an inlet of the air storage chamber sequentially through the high-temperature sides of a high-temperature heat exchanger and a medium-temperature heat exchanger, and an outlet of the air storage chamber communicates with an inlet of the expander unit sequentially through a regulating valve and the low-temperature sides of a medium-temperature regenerator and a high-temperature regenerator;
the low-temperature side of the high-temperature heat exchanger, a high-temperature heat reservoir, a first valve, the high-temperature side of the high-temperature regenerator, a high-temperature cold reservoir and a second valve are connected in sequence end to end to form a high-temperature regenerative loop; the low-temperature side of the medium-temperature heat exchanger, a medium-temperature heat reservoir, a third valve, the high-temperature side of the medium-temperature regenerator, a medium-temperature cold reservoir and a fourth valve are connected in sequence end to end to form a medium-temperature regenerative loop;
the compressor unit lubrication station, a compressor unit oil pump, an oil way inside the compressor unit and the high-temperature side of a compressor unit oil cooler are connected in sequence end to end to form a first oil circulation loop; a heating pipe inlet inside the compressor unit lubrication station communicates with an outlet of the high-temperature cold reservoir through a high-temperature valve, and a heating pipe outlet communicates with an inlet of an intermediate cold reservoir; an outlet of the intermediate cold reservoir communicates with a pipeline for connecting the high-temperature cold reservoir and the second valve; and the high-temperature valve is electrically connected with the temperature sensor inside the compressor unit lubrication station; and
the expander unit lubrication station, an expander unit oil pump, an oil way inside the expander unit and the high-temperature side of an expander unit oil cooler are connected in sequence end to end to form a second oil circulation loop; a heating pipe inlet inside the expander unit lubrication station communicates with an outlet of the medium-temperature heat reservoir through a medium-temperature valve, and a heating pipe outlet communicates with an inlet of the medium-temperature cold reservoir; and the medium-temperature valve is electrically connected with the temperature sensor inside the expander unit lubrication station.

2. The regenerative compressed air energy storage system of claim 1 , wherein an inlet at the low-temperature side of the compressor unit oil cooler communicates with an outlet of the medium-temperature cold reservoir and an outlet at the low-temperature side of the compressor unit oil cooler communicates with an inlet of the medium-temperature heat reservoir, respectively.

3. The regenerative compressed air energy storage system of claim 2 , wherein the outlet of the medium-temperature cold reservoir communicates with the inlet at the low-temperature side of the compressor unit oil cooler through a first circulation pump.

4. The regenerative compressed air energy storage system of claim 1 , wherein an inlet at the low-temperature side of the expander unit oil cooler communicates with an outlet of the medium-temperature cold reservoir and an outlet at the low-temperature side of the expander unit oil cooler communicates with an inlet of the medium-temperature heat reservoir, respectively.

5. The regenerative compressed air energy storage system of claim 4 , wherein the outlet of the medium-temperature cold reservoir communicates with the inlet at the low-temperature side of the expander unit oil cooler through a second circulation pump.

6. The regenerative compressed air energy storage system of claim 1 , wherein the highest point of the heating pipe inside the compressor unit lubrication station is lower than an operating liquid level of the high-temperature cold reservoir, and the lowest point of the heating pipe inside the compressor unit lubrication station is higher than an operating liquid level of the intermediate cold reservoir.

7. The regenerative compressed air energy storage system of claim 1 , wherein the highest point of the heating pipe inside the expander unit lubrication station is lower than an operating liquid level of the medium-temperature heat reservoir, and the lowest point of the heating pipe inside the expander unit lubrication station is higher than an operating liquid level of the medium-temperature cold reservoir.

8. The regenerative compressed air energy storage system of claim 1 , wherein outlets of the medium-temperature heat reservoir and the medium-temperature cold reservoir each communicates with an inlet of the high-temperature heat exchanger.

9. A method of operating a compressor unit lubrication and an expander unit lubrication in a regenerative compressed air energy storage system:
wherein the regenerative compressed air energy storage system comprises:
an air storage chamber, a compressor unit, an expander unit, a compressor unit lubrication station, an expander unit lubrication station, and an electric motor connected to the compressor unit and a generator connected to the expander unit, wherein a heating pipe and a temperature sensor are disposed inside each of the compressor unit lubrication station and the expander unit lubrication station;
an outlet of the compressor unit communicates with an inlet of the air storage chamber sequentially through the high-temperature sides of a high-temperature heat exchanger and a medium-temperature heat exchanger, and an outlet of the air storage chamber communicates with an inlet of the expander unit sequentially through a regulating valve and the low-temperature sides of a medium-temperature regenerator and a high-temperature regenerator;
the low-temperature side of the high-temperature heat exchanger, a high-temperature heat reservoir, a first valve, the high-temperature side of the high-temperature regenerator, a high-temperature cold reservoir and a second valve are connected in sequence end to end to form a high-temperature regenerative loop; the low-temperature side of the medium-temperature heat exchanger, a medium-temperature heat reservoir, a third valve, the high-temperature side of the medium-temperature regenerator, a medium-temperature cold reservoir and a fourth valve are connected in sequence end to end to form a medium-temperature regenerative loop;
the compressor unit lubrication station, a compressor unit oil pump, an oil way inside the compressor unit and the high-temperature side of a compressor unit oil cooler are connected in sequence end to end to form a first oil circulation loop; a heating pipe inlet inside the compressor unit lubrication station communicates with an outlet of the high-temperature cold reservoir through a high-temperature valve, and a heating pipe outlet communicates with an inlet of an intermediate cold reservoir; an outlet of the intermediate cold reservoir communicates with a pipeline for connecting the high-temperature cold reservoir and the second valve; and the high-temperature valve is electrically connected with the temperature sensor inside the compressor unit lubrication station; and
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Assignees

• Univ Tsinghua

Inventors

• Mei Shengwei
• Xue Xiaodai
• Zhang Xuelin
• Zhang Tong
• Chen Laijun
• Lu Qiang
• Zheng Tianwen

Classifications

• F01K21/00

  Steam engine plants not otherwise provided for · CPC title

• F01K3/00

  Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein (regenerating exhaust steam F01K19/00) · CPC title

• F01K7/00

  Steam engine plants characterised by the use of specific types of engine (F01K3/02 takes precedence); Plants or engines characterised by their use of special steam systems, cycles or processes (reciprocating-piston engines using uniflow principle F01B17/04); Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating · CPC title

• F02C1/04

  the working fluid being heated indirectly {(in a fluidised-bed combustor F02C3/205)} · CPC title

• F01K13/00 Primary

  General layout or general methods of operation of complete plants · CPC title