Combined heat and power compressed air energy storage system and method for back pressure thermoelectric unit

Abstract

The invention discloses a thermoelectricity combined supply type compressed air energy storage system and a thermoelectricity combined supply type compressed air energy storage method for a back pressure type thermoelectric unit. The system comprises the back pressure type thermoelectricity cogeneration unit and a heat insulation compressed air energy storage system. During the electricity consumption valley time period at night, a compressed air energy storage device is used for storing redundant electric energy by compression, and heat generated in an air compression process is supplied to the thermoelectricity cogeneration unit through a heat exchange device; during the electricity consumption peak time period in the day, compressed air is expanded to generate power and absorbs the redundant heat generated by the thermoelectricity cogeneration unit. According to the system and the method, the electric energy is stored by the compressed air, and the heat-to-electricity ratio of the back pressure type thermoelectric unit can be regulated in the air compression and release processes, so that the peak load regulation capacity of the thermoelectricity cogeneration unit is improved; compared with the existing single-electric-energy storage system, the system disclosed by the invention has the advantage that under the same energy storage capacity, the system can provide a larger wind-power consumption space.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of clean energy, and relates to a combined heat and power compressed air energy storage system and method for a back pressure thermoelectric unit. Background technique [0002] With the continuous expansion of the scale of wind power development and utilization in China, wind power grid-connected operation and market consumption have become important factors restricting the development of wind power. In the three northern regions where wind power is relatively concentrated in my country, the wind speed is very high at night in winter, but the demand for electricity load at night is low. To ensure the heating requirements during the winter heating period, most of the combined heat and power units operate in the mode of "setting power by heat". For the large number of back-pressure thermal power units in thermal power plants, the output heat-to-electricity ratio is fixed, and it is ...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the above problems, to provide a combined heat and power compressed air energy storage system and method for back pressure thermal power units, which has the ability to solve the problem of cogeneration unit operation and wind power grid connection during the heating period in winter A large amount of wind power is forced to abandon wind caused by the contradiction between them. Advantages

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