A method of using underground mines for energy storage and power generation

Abstract

The invention relates to a method for energy storage and power generation by using an underground mine. At present, there is no method for energy storage and power generation with low equipment investment and high energy conversion rate. The present invention includes the steps of energy storage and power generation. In the energy storage step, the reversible pump-turbine is driven by the electric energy of the external power grid when the power grid is rich in the process of smoothing the peak and valley power, and the water in the open cavity is injected into the sealed cavity. , when the reversible water pump turbine stops running, adjust the air pressure in the sealed cavity to the design set value between 1-30 MPa; in the power generation step, the water in the sealed cavity is in the sealed cavity Under the action of air pressure, it is discharged into the open cavity through the upper and lower water pipes, and the discharged water drives the reversible water pump turbine to generate electricity, and the electric energy generated by the reversible water pump turbine is incorporated into the external grid that lacks power. The equipment of the invention has the advantages of low investment, simple operation, high energy conversion rate, and can effectively utilize the peak and valley power and wind power of the power grid.

Description

technical field [0001] The present invention relates to a method for energy storage and power generation, in particular to a method for utilizing underground mines for energy storage and power generation. Water is transported into the underground mines mainly through electric pumps, and the underground mines are compressed by the water transported in. The purpose of energy storage is achieved through the air in the underground mine, and the water is transported to the hydroelectric generator through the high-pressure air in the underground mine to achieve the purpose of generator power generation, which belongs to the technical field of hydroelectric power generation. Background technique [0002] Electric energy has increasingly become an indispensable source of energy for people's work and life. However, there is currently a paradoxical phenomenon that exists worldwide. That is, people consume a lot of electricity during the day. The supply exceeds the demand; and the elec...

AI Technical Summary

Problems solved by technology

Since the voltage of the electricity generated by the wind turbine and the frequency of the alternating current are required, the change of the power is actually the change of the current. Obviously, such a magnitude of the current change will inevitably lead to the instability of the power grid, which is why the power grid is not suitable for wind power grid connection. I am very opposed to it. It is only because the policy is inclined to renewable energy that we have to receive wind power. At the same time, the power supply department has to spend a lot of money to stabilize the quality of electricity. This is where the bottleneck of wind power grid connection lies.

It can be seen that at present, it is still difficult for people to fully and effectively use wind power, resulting in a large waste of wind power resources, and it is difficult to use resources rationally.

[0007] At present, there are also some relatively good methods for storing electric energy. For example, in a Chinese patent with a publication date of December 14, 2005 and a publication number of CN1707095, a method for generating electricity using high-pressure air energy storage is disclosed. The solution is to make several large gas storage tanks. When the electricity is surplus at night, store gas in the gas storage tanks. When the electricity consumption peaks during the day, open the valves of the gas storage tanks, and use the high-pressure air in the gas storage tanks to drive the gas turbine. And drive the generator to generate electricity. After the electric energy is stored in the form of compressed air, it is very impractical to use air to drive the power machinery. In this invention, the efficiency of storing gas in the gas storage tank is low, and it is driven by high-pressure air. The gas turbine drives the generator to generate electricity. Due to the low density of high-pressure air, the power generation efficiency is very low and the energy conversion rate is low.

Similarly, the publication date is May 17, 2006, and the Chinese patent publication number CN1773110 discloses a compressed air energy storage device and its application. The technical solution is to convert the uncontrollable energy in nature into a Store in the form of controlled compressed air, and use the energy generated when the stored compressed air is released as the energy for driving equipment. This method also uses high-pressure air to drive the generator to generate electricity, which has low power generation efficiency and low energy conversion rate.

[0008] To sum up, at present, there is no method of energy storage and power generation with low equipment investment, simple operation, and high energy conversion rate, which makes it difficult to effectively utilize wind power, and it is difficult to fully utilize energy including peak and valley power of the grid. Utilization, increases the cost of electricity

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