Gravity compressed air energy storage system and method based on coal yard of thermal power plant

Abstract

The invention discloses a gravity compressed air energy storage system and method based on a coal yard of a thermal power plant. In the system, a coal yard bearing plate is hermetically connected with the upper end of an air storage chamber; the input ends of the first-stage compressor and the second-stage compressor are connected with a motor, an outlet of the first-stage compressor is connected with a heat inlet of the first-stage interstage heat exchanger, and a heat outlet of the first-stage interstage heat exchanger is connected with an inlet of the second-stage compressor; an outlet of the second-stage compressor is connected with a heat inlet of the first-stage rear heat exchanger, and a heat outlet of the first-stage rear heat exchanger is communicated with the air storage chamber; the output ends of the first-stage expansion machine and the second-stage expansion machine are connected with a generator; an outlet of the air storage chamber is connected with a cold inlet of the second-stage front heat exchanger; an inlet of the first-stage expansion machine is connected with a cold outlet of the second-stage front heat exchanger, an outlet of the first-stage expansion machine is connected with a cold inlet of the second-stage inter-stage heat exchanger, and an inlet of the second-stage expansion machine is connected with a cold outlet of the inter-stage heat exchanger; and inlets and outlets of the heat storage tank and the cold storage tank are connected with the heat exchangers. The gravity energy storage technology and the compressed air energy storage technology are coupled.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a gravity compressed air energy storage system and method based on coal yards of thermal power plants. Background technique [0002] In recent years, with the accelerated transformation of the global energy structure to renewable energy and the proposal of my country's dual carbon goals, new energy is gradually developing into the main power source. According to estimates, the proportion of clean energy power generation is expected to reach 93% in 2060. The high proportion of renewable energy places higher requirements on the flexibility of grid regulation, and there is a huge demand gap for energy storage systems. On the other hand, in the future, a large number of low-parameter small thermal power plants will face the fate of being gradually shut down, while high-parameter large thermal power units will face problems such as deep peak regulation and flexible ...

AI Technical Summary

Problems solved by technology

Due to the poor safety of electrochemical energy storage, accidents of lithium battery energy storage power stations have occurred frequently in recent years; pumped hydro storage is limited by geographical conditions and has unpredictable impact on the ecological environment; the energy storage efficiency of gravity energy storage system is high, responsive Fast speed, low construction cost, and long running time, but its energy density is low and the construction scale is too large, so there is currently no commercial application

The traditional compressed air energy storage system has large energy storage capacity, high energy density, low construction and operation costs, and long operation time, but its efficiency is low and limited by geographical conditions, so it is difficult to apply in thermal power plants

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