Solar thermoelectric decoupling system based on combination of heat storage and compression heat pump and operation method thereof

Abstract

The invention discloses a solar thermoelectric decoupling system based on combination of heat storage and a compression heat pump and an operation method thereof, and belongs to the field of mechanical engineering and energy conservation. The problems that in the prior art, power resources cannot be directly stored and need to be matched with electrical loads, and the flexibility of a cogeneration unit is limited are solved. The system is characterized by comprising a heat storage subsystem, a power island subsystem and a compression heat pump waste heat recovery subsystem; a high-temperature evaporator provides required driving steam for the power island subsystem, and a low-temperature evaporator provides required driving steam for the compression type heat pump waste heat recovery subsystem; and a low-pressure heat exchanger of the compression type heat pump waste heat recovery subsystem is connected with cold end circulating water of the power island system, a high-pressure heat exchanger is connected with a heat user heat exchange station, and decoupling of power supply and heat supply is achieved. According to the solar thermoelectric decoupling system based on combination of heat storage and the compression heat pump and the operation method thereof, on the premise of low cost input, decoupling operation of power generation and heat supply of a photo-thermal power generation cogeneration system is achieved, comprehensive gradient utilization of system energy is achieved, and the operation flexibility of the photo-thermal power generation cogeneration unit is improved.

Description

technical field [0001] The invention relates to a solar thermoelectric decoupling system and an operating method thereof, in particular to a solar thermoelectric decoupling system based on a combination of heat storage and a compression heat pump and an operating method thereof, belonging to the technical fields of mechanical engineering and energy saving. Background technique [0002] In northern China, heating units are widely used to solve the problem of large-area central heating due to their high energy efficiency. During the heating period of 4-6 months, in order to ensure the quality of heat supply, the heating unit adopts the mode of “heating fixed power”, the output of the unit is limited by the heat load, and the peak-shaving performance of the heating unit is insufficient, which is also indirectly The phenomenon of "abandoning wind and light" is more serious. [0003] Although the solar thermal cogeneration unit does not participate in peak regulation, it needs t...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem in the prior art that power resources cannot be directly stored and need to be matched with the power load, which greatly limits the flexibility of cogeneration units, and further provides a heat pump based on the combination of heat storage and compression heat pump The solar thermoelectric decoupling system and its operation method comprehensively consider the characteristics of the power island cycle of the photothermal unit and the compression heat pump cycle, and use the solar heat storage system as the driving heat source to achieve the purpose of power generation, heating and even cooling

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