Low-back-pressure cylinder switching and steam ejector heating combined type heat supply-power generation decoupling system and method

Abstract

The embodiment of the invention provides a low-back-pressure cylinder switching and steam ejector heating combined type heat supply-power generation decoupling system and method. The low-back-pressurecylinder switching and steam ejector heating combined type heat supply-power generation decoupling system comprises a first steam cooling device and a heat supply network return water heating devicewhich are connected in parallel to the steam outlet end of a steam turbine adjusting end low-pressure cylinder. The first steam cooling device comprises a first air cooling island with an adjustable cooling capacity, and the first air cooling island is connected to the steam outlet end of the turbine adjusting end low-pressure cylinder through a first pipeline. The heat supply network return waterheating device comprises a high-back-pressure heat supply network heater, a steam ejector and a steam jet heater, wherein the steam jet heater is connected to the steam ejector in series through a pipeline, and the high-back-pressure heat supply network heater is arranged in parallel with the steam ejector and the steam jet heater which are connected in series. The high-back-pressure heat supplynetwork heater and the steam jet heater are sequentially arranged on a heating path for gradually raising the temperature of the return water of the heat supply network. When the heating demand is high and the power generation load is low, the heat supply and power supply demands are met at the same time, and heat supply-power generation decoupling is achieved, mutual infuence between heat supplyand power supply is avoided.

Description

technical field [0001] The invention relates to the field of steam heating and power generation, in particular to a thermoelectric decoupling system and method for low back pressure cylinder cutting combined with steam ejector heating. Background technique [0002] In recent years, due to the increasingly prominent contradiction between power grid peak regulation and heating and wind power consumption in the heating season, the situation of peak regulation in the heating season is severe. The heat-fixed electricity model is unsustainable for heating units. In order to meet the requirements of power grid peak regulation, each heating unit needs to undergo technical transformation so that the heating unit can not only meet the demand for heating, but also have a certain degree of regulation. peak capacity. [0003] In the process of realizing the present invention, the applicant found that at least the following problems existed in the prior art: [0004] When conventional c...

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Problems solved by technology

Usually, the power is fixed by heat, which reduces the flexibility of unit load regulation, cannot adapt to lower electric load operation, and cannot achieve deep peak regulation

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