Thermodynamic system capable of achieving one-furnace-two-machine ultra-low load operation and switching method of one-furnace-two-machine ultra-low load operation

Abstract

The invention discloses a thermodynamic system capable of achieving one-furnace-two-machine ultra-low load operation and a switching method of one-furnace-two-machine ultra-low load operation. The system comprises two unit system units. The first unit system unit comprises a first intermediate-pressure cylinder exhaust valve, a first temperature and pressure reducing valve, a first intermediate-pressure cylinder exhaust adjusting valve, a first cylinder cooling steam pipeline and the like; the second unit system unit comprises a second intermediate-pressure cylinder exhaust valve, a second temperature and pressure reducing valve, a second intermediate-pressure cylinder exhaust adjusting valve, a second low-pressure cylinder cooling steam pipeline and the like; and an outlet of the first intermediate-pressure cylinder exhaust valve is connected with an outlet of the second intermediate-pressure cylinder exhaust valve through an intermediate-pressure cylinder exhaust connecting pipe, and an intermediate-pressure cylinder exhaust connecting pipe adjusting valve is installed on the intermediate-pressure cylinder exhaust connecting pipe. According to the method, flexible switching between the two unit system units is achieved. Technical transformation on a boiler side is not needed, the acting force difference characteristic of a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder is fully utilized, operation is flexible, the function is practical, and meanwhile certain accident resisting capacity is achieved.

Description

technical field [0001] The invention belongs to the technical field of energy and power steam turbine power generation, and in particular relates to a thermodynamic system with one furnace and two machines operating at ultra-low load and a switching method thereof. Background technique [0002] In the power dispatching system, new energy power enjoys the priority dispatch right, but new energy power often has the characteristics of large fluctuations and instability. In order to absorb more zero-carbon emission electricity, thermal power generating units must have excellent deep peak-shaving capabilities. The introduction of the power peak-shaving auxiliary service market policy also encourages more thermal power generating units to participate in it. [0003] Due to the minimum stable combustion output limit of coal-fired boilers without auxiliary fuel, the minimum electrical load of existing thermal power units is generally limited to about 30%-40%, and further reduction w...

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Problems solved by technology

Chinese Invention Patent Publication CN109653810A discloses a thermal system with one furnace and two machines switching operation. By adding superheated steam and reheated steam bypass and control valves, it solves the problem that when one boiler fails, one boiler can be used to drive two boilers. steam turbine to generate electricity, but the system layout is relatively complicated, and the deep peak-shaving capability of the unit needs to be further explored

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