Fortschrittlicher Luftenergiespeicher-Expander

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Who developed the energy storage expander?

This expander is independently developed by the Institute of Engineering Thermophysics (IET) of the Chinese Academy of Sciences and ZHONG-CHU-GUO-NENG (BEIJING) TECHNOLOGY CO., LTD. Energy storage technology serves as the key supporting technology for energy revolution.

What is a 300 MW compressed air expander?

Compared with the 100-MW advanced CAES system, the 300-MW system will achieve a threefold amplification in scale, a reduction of 20%-30% in unit cost and an enhancement of 3-5% in overall efficiency. The development of the 300-MW compressed air expander stands as a milestone in the field of compressed air energy storage in China.

How does a liquid air expander work?

During discharge, liquid air is pumped to a higher pressure and delivered to a cold storage device. The cold energy of the liquid air is transferred and stored for future use. The liquid air was gasified. Air is heated again by stored heat or other heat sources and enters the expander to generate electricity.

How does a compressed gas expander work?

The potential energy of the compressed gas is transferred to mechanical energy of the shaft. In the expander, the timings of opening and closing the intake and exhaust valves can be controlled. For example, the intake valve of the expander opens when air reaches sufficient pressure in the cylinder.

What are the challenges of the expander?

The expander is the key core component of the compressed air energy storage system, and poses numerous technical challenges, such as high load, large flow, complex flow and heat transfer coupling, and varied working conditions.

Why is air expander important in a CAES system?

Air expander is one of the key components in a CAES system because its operational characteristics determine the power conversion efficiency and the power generation during the discharge period. The performance of the expander contributes heavily to the round trip efficiency of the whole system.