A constant pressure compressed air energy storage device

Abstract

The invention discloses a constant-pressure air compressing and energy storing device. The constant-pressure air compressing and energy storing device comprises a storing chamber, a water storing poolis connected with the storing chamber through a water pipe, the water storing pool is arranged to be higher than the storing chamber in the vertical direction, an air storing bag is arranged in the storing chamber, the air storing bag is respectively connected with a compressing pipeline and a power generating pipeline through an air pipe penetrating through the storing chamber, the compressing pipeline compresses and sends the air into the air storing bag, and the power generating pipeline releases the stored high-pressure air out to generate power. The constant-pressure air compressing andenergy storing device has the advantages that the output pressure is constant, low pressure and efficient storage are achieved, the sealing performance is good, the device is easy to maintain, the storing chamber is stable and easy to control, and the device has good popularization prospects.

Description

technical field [0001] The invention relates to the technical field of energy storage and power generation, in particular to a constant-pressure compressed air energy storage device. Background technique [0002] The power industry is the most important basic energy industry in the development of the national economy. It is related to the national economy and the people's livelihood, and it is a priority development focus in the country's economic development. With the rapid development of China's economy, the demand for electric power is increasing. At the same time, the requirements and standards for the electric power industry are also accelerating the transition from the simple production, transmission, transformation and distribution in the past to the optimal allocation of resources. Therefore, building a smart grid that is green, environmentally friendly, safe and efficient, rich in configuration, flexible and changeable is the direction of my country's power industry...

AI Technical Summary

Problems solved by technology

[0004] There are two main problems in the existing compressed air energy storage. The first problem is that the energy medium of the current compressed air energy storage is generally high-pressure air, but the high-pressure air needs to be compressed in stages, and the staged compression will generate a lot of heat. Different low-grade gradient heat; similarly, when high-pressure air is released from the gas storage container to generate electricity, supplementary combustion heating and staged expansion are required in the middle

This not only requires complex compressor units and expansion units, but also requires a large number of heat exchange devices and supplementary combustion devices, which makes the equipment cost high, and the heat exchange efficiency is not very high, resulting in a large amount of energy loss

In addition, high-pressure air, the energy medium, will place high demands on the strength of system equipment materials, and the technical requirements are relatively high. The cycle of high-pressure inflation and deflation can easily cause fatigue damage to the gas storage container, and even damage

At the same time, the fluctuation of the internal pressure of the high-pressure gas storage container with too high grade also makes there are great hidden dangers in safe operation.

[0005] The second problem is that the existing gas storage containers for compressed air energy storage, whether they are gas storage tanks or gas storage caverns, are all fixed-volume cavity deflation problems. With the reduction of compressed air volume, the output The air pressure will become smaller and smaller, and constant pressure gas transmission cannot be guaranteed, resulting in unstable power generation

The existing common practice is often external pressurization or valve control pressure. External pressurization is to heat and expand the compressed air to ensure sufficient output air pressure. The disadvantage is that it is not energy-saving and environmentally friendly.

Valve pressure control is to ensure sufficient air pressure by changing the cross-sectional area of ​​the compressed air pipeline, but this will make the total volume of the output air flow smaller and reduce the system efficiency

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