CN104675763B - Compressed air energy storage device with heating function and method for operating compressed air energy storage device - Google Patents

Abstract

The invention relates to the fields of new energy and compressed air energy storage, in particular to a compressed air energy storage device and an operating method that can be used for heating. The pressure vessel is directly connected to the high-pressure gas storage tank through the pipeline at the top; the pressure vessel is connected to the cold water pool through the hydraulic device through the pipeline at the bottom; the pressure vessel is connected to the external liquid source through the preheater and the liquid transfer pump through the pipeline at the bottom Connected; the upper part of the pressure vessel is provided with a heat exchanger, and the lower part is provided with a liquid circulation pump. The liquid circulation pump and the inlet of the heat exchanger are connected through a liquid pipeline, and the outlet of the heat exchanger is extended to the lower part of the pressure vessel through a liquid pipeline. The device has two modes of operation: energy storage and power generation. In the working mode of energy storage, the device compresses the gas and uses the heat released during the compression process to provide heating; in the working mode of power generation, the gas expands to drive power generation. The invention can not only improve the absorptive capacity of wind power, but also alleviate the heating pressure.

Description

A kind of compressed air energy storage device and operation method that can be used for heating

technical field

The invention relates to the fields of new energy and compressed air energy storage, in particular to a compressed air energy storage device and an operating method that can be used for heating.

Background technique

The heating period in northern my country is relatively long in winter. In order to ensure the heating of residents, wind power has to "give way" for thermal power to protect people's livelihood. Therefore, the phenomenon of wind abandonment in winter is serious, and the average utilization hours of wind power is lower than the national value. It is confirmed that the focus will be on realizing the local consumption of wind power, and that the emphasis will be shifted from pure development to development and utilization, and one of the goals will be to transform abandoned wind resources into a characteristic growth point that stimulates local economic development. In addition, wind power has now become recognized as a clean energy that can be developed on a large scale. To reduce grid carbon emissions, wind power consumption technology can be effectively utilized in the application of compressed air energy storage device technology.

Now there are many energy storage technologies, such as pumped water storage technology, compressed air energy storage technology, supercapacitor energy storage technology, battery energy storage technology, etc., but only Pumped hydro storage and compressed air storage, and they each have their own limitations. The main disadvantage of traditional compressed air energy storage is that it needs to consume a lot of gas, generate carbon emissions, and its efficiency is not high, which limits its application and promotion.

Contents of the invention

Aiming at the heating period in winter, the invention proposes a compressed air energy storage device and an operation method for heating that can not only improve the capacity of wind power consumption but also alleviate the pressure of heating in order to solve the problems of severe wind abandonment and high heating pressure in winter.

The technical scheme that device of the present invention adopts is:

The pressure vessel is directly connected to the high-pressure gas storage tank through the pipeline at the top; the pressure vessel is connected to the cold water pool through the hydraulic device through the pipeline at the bottom; the pressure vessel is connected to the external liquid source through the preheater and the liquid transfer pump through the pipeline at the bottom Connected; a heat exchanger is installed inside the pressure vessel, and a liquid circulation pump is installed outside. The two ends of the liquid circulation pump are respectively connected to the lower part of the pressure vessel and one end of the heat exchanger through pipes. The space is connected; when the device is running, the gas and liquid are in direct contact for heat and mass exchange.

The hydraulic device has two working states: hydraulic motor state and hydraulic pump state.

When the hydraulic device is in the hydraulic motor state, the liquid flows out from the pressure vessel, drives the hydraulic device to work, and flows into the cold water pool. At this time, the hydraulic device converts the potential energy of the liquid into mechanical energy, and then into electrical energy.

When the hydraulic device is in the hydraulic pump state, the hydraulic device pumps liquid from the cold water pool into the pressure vessel.

Based on the compressed air energy storage device that can be used for heating provided by the present invention, there are two operation modes of energy storage and power generation;

The energy storage operation mode is as follows: the hydraulic device consumes wind energy to send the liquid in the cold water pool into the pressure vessel, and the continuously sent liquid compresses the gas in the pressure vessel, and the formed high-pressure gas is sent into the high-pressure gas storage tank; the liquid The transfer pump works to pump the liquid in the pressure vessel through the pipeline and send it to an external liquid source for heating;

The power generation operation mode is as follows: the high-pressure gas enters the pressure vessel from the high-pressure gas storage tank to expand, and at the same time, the liquid transfer pump continuously sends the liquid from the external liquid source to the preheater for heating, and then sends it into the pressure vessel; the expanded gas Pushing the fluid drives the hydraulics to generate electricity.

The beneficial effects of the present invention include the following aspects:

(1) In the process of compressed air energy storage, the present invention uses new energy such as wind power to drive the compression module for energy storage, thereby improving the system's ability to absorb new energy such as wind power.

(2) The present invention releases heat in the process of compressing air energy storage, and heats water through these excess heat, thereby heating, reducing the pressure of heating in winter.

(3) The present invention introduces energy storage technology into the power system to cut peaks and fill valleys, reducing the pressure of load fluctuations in the power system.

Description of drawings

Fig. 1 is the structural representation of device;

Labels in the figure:

1-High pressure gas storage tank, 2-Preheater, 3-Pressure vessel, 4-Hydraulic device, 5-Liquid circulation pump, 6-Cold water pool, 7-Liquid transfer pump, 8, 10-Gas pipeline, 9-Liquid Outlet, 11-16-liquid pipeline, 17-heat exchanger, 18-22-valve.

detailed description

The present invention provides a compressed air energy storage device and an operation method that can be used for heating. The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Figure 1 is a schematic structural view of the device. The top of the pressure vessel 3 is connected to the high-pressure gas storage tank 1 through the gas pipeline 10 and the valve 21 . On the other hand, the top of the pressure vessel 3 is connected to the low-pressure gas through the gas pipeline 8 and the valve 18 . The bottom of pressure vessel 3 is connected with preheater 2 and liquid transfer pump 7 through liquid pipeline 13 and valve 20, and liquid transfer pump 7 is connected with external liquid source through liquid pipeline 14 simultaneously; On the other hand, the bottom of pressure vessel 3 is also connected through The liquid pipeline 11 and the valve 19 are connected to the hydraulic device 4, and the hydraulic device 4 is connected to the cold water pool 6 through the liquid pipeline 12; a heat exchanger 17 is arranged inside the pressure vessel 3, and a liquid circulation pump 5 is arranged on the outside, and the liquid circulation pump 5 It is connected to the lower part of the pressure vessel 3 through the liquid pipeline 15, and connected to the internal heat exchanger 17 through the liquid pipeline 16 and the valve 22, wherein the end of the heat exchanger 17 is not closed, and a liquid outlet 9 is provided to directly connect with the inner space of the pressure vessel.

The device has two modes of operation: energy storage and power generation:

Taking Figure 1 as an example, the energy storage process is as follows:

At the beginning, the pressure vessel 3 is filled with low-pressure air, the valves 18, 20, 21 are closed, the valve 19 is opened, the hydraulic device 4 works in the hydraulic pump state, and the liquid is sent from the cold water pool 6 into the pressure vessel 3, and the continuously entering liquid continues to flow. The low-pressure air in the pressure vessel 3 is compressed to form high-pressure gas. At this time, the valve 21 is opened, the hydraulic device 4 continuously sends the liquid into the pressure vessel 3, and the high-pressure gas is sent into the high-pressure gas storage tank 1, and the valve is closed. 19, 21; valves 18, 20 are opened, and the liquid transfer pump 7 works to extract the liquid in the pressure vessel 3 and send it to an external liquid source for heating. As the liquid flows out, the outside air flows in through the gas pipeline 8 until the liquid is completely Flow out of the pressure vessel 3, the gas is completely filled with the pressure vessel 3, and an energy storage process ends. Throughout the energy storage process, the liquid circulation pump 5 continuously pumps the liquid from the lower part of the container to the heat exchanger 17 inside the container.

Taking Figure 1 as an example, the power generation process is as follows:

At the beginning, the pressure vessel 3 was full of gas, and the valves 18, 19, 20, 21 were all closed. Open the valves 18 and 20, the liquid transfer pump 7 works, and the liquid from the external liquid source is sent to the preheater 2, the preheater 2 heats the liquid, the heated liquid flows into the pressure vessel 3, and the gas gradually flows out from the gas pipeline 8 , until the liquid completely fills the pressure vessel 3, the valves 18 and 20 are closed; the valves 19 and 21 are opened, the high-pressure gas storage tank 1 delivers a certain amount of high-pressure gas to the pressure vessel 3, the valve 21 is closed, and the high-pressure gas expands in the pressure vessel 3, The liquid in the container flows out continuously through the liquid pipeline 11 to drive the hydraulic device 4 to generate electricity. At this time, the hydraulic device 4 is in the state of a hydraulic motor. Throughout the power generation process, the liquid circulation pump 5 continuously pumps the liquid from the lower part of the container to the heat exchanger 17 inside the container.

Claims (4)

1. a kind of compression air energy-storing apparatus that can be used for heating it is characterised in that pressure vessel (3) by the pipeline at top and High pressure tank (1) is joined directly together；The pipeline by bottom for the pressure vessel (3), through hydraulic means (4), with water cooling pond (6) phase Even；The pipeline by bottom for the pressure vessel (3), through preheater (2) and liquid shifting pump (7), is connected with outer liquid body source；Pressure Setting heat exchanger (17) in force container (3), outside setting liquid circulation pump (5), pipeline is passed through at the two ends of liquid circulation pump (5) It is connected with the bottom of pressure vessel (3) and heat exchanger (17) respectively, the end of heat exchanger (17) is not closed, hold with pressure Device (3) inner space is connected；Device operationally, gas-liquid directly contact, carry out caloic exchange；Described hydraulic means (4) has two Plant working condition：Hydraulic motor state and hydraulic pump state.

2. according to claim 1 a kind of can be used for heat compression air energy-storing apparatus it is characterised in that：Described hydraulic pressure When device (4) is hydraulic motor state, liquid flows out from pressure vessel (3), drives hydraulic means (4) work, and flows into In water cooling pond (6), now liquid potential energy is mechanical energy by hydraulic means (4), and then is converted into electric energy.

3. according to claim 1 a kind of can be used for heat compression air energy-storing apparatus it is characterised in that：Described hydraulic pressure When device (4) is hydraulic pump state, liquid is pumped in pressure vessel (3) from water cooling pond (6) by hydraulic means (4).

4. a kind of based on can be used for described in claim 1 heat compression air energy-storing apparatus operation method it is characterised in that Described device has energy storage and the two kinds of methods of operation that generate electricity；

Described storage energy operation mode is：Hydraulic means (4) consumes wind energy and sends in pressure vessel (3) by the liquid of water cooling pond (6), The gas in liquid compression pressure vessel (3) sent constantly into, the gases at high pressure of formation are fed in high pressure tank (1)； Liquid shifting pump (7) works, and the liquid in pressure vessel (3) is extracted out by pipeline, sends into outer liquid body source, for supplying Warm；

Described generator operation mode is：Gases at high pressure enter from high pressure tank (1) in pressure vessel (3) and expand, liquid simultaneously The liquid of outer liquid body source is constantly given preheater (2) and is heated by body shifting pump (7), and sends in pressure vessel (3)；Swollen Swollen gas pushed liquid drives hydraulic means (4) to generate electricity.