Heat-power decoupling system of combined heat and power generation unit and operation method

Abstract

The invention discloses a heat-power decoupling system of a combined heat and power generation unit and an operation method. The system comprises a boiler, a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder, a steam turbine low-pressure cylinder, a condenser, a condensation water pump and a heat regenerative system which communicate with one another in sequence, and further comprises a heat supply system formed by an absorption heat pump, a heat storage heat exchanger, a heat storage tank, a high-temperature heater and a low-temperature heater jointly; the heat regenerative system comprises a low-pressure heater set, a deaerator, a water feeding pump and a high-pressure heater set which are connected in sequence, the storage temperature of the heat storage tank is 50 DEG C to 350 DEGC, heat release is performed through two stages, a high-temperature section serves as a driving heat source of the absorption heat pump, and a low-temperature section is used for further heating heat-network water obtained after absorbing heat in the absorption heat pump. According to the heat-power decoupling system of the combined heat and power generation unit and the operation method, heat-power decoupling can be realized, the waste heat of exhaust steam of a steam turbine is recycled, and the energy utilization efficiency is high.

Description

technical field [0001] The invention relates to the technical field of cogeneration of heat and power, in particular to a thermoelectric decoupling system and an operation method of a cogeneration unit. Background technique [0002] In 2018, the new power generation equipment capacity of the national infrastructure was 124.39 million kilowatts. Among them, hydropower is 8.54 million kilowatts, thermal power is 41.19 million kilowatts, nuclear power is 8.84 million kilowatts, wind power is 21 million kilowatts, and solar power is 44.73 million kilowatts. New wind power and solar power installed capacity accounted for 52.84% of the total new installed capacity. One of the prominent contradictions in my country's cogeneration industry is that the growth of electricity consumption is sluggish. In some areas, electricity consumption has even experienced negative growth, but the demand for heat has continued to increase, which limits the development of large-scale condensing coge...

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Problems solved by technology

With the continuous expansion of wind power grid-connected scale, the phenomenon of wind curtailment during the low load period during the winter heating period is becoming more and more serious. The forced output of the system is too high during the low valley period, and the space for wind power grid connection is insufficient

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