Condensing extraction back-pressure coupling steam extraction integrated system for thermoelectric unit power peak shaving and operation method thereof

Abstract

The invention relates to a condensing extraction back-pressure coupling steam extraction integrated system for thermoelectric unit power peak shaving and an operation method thereof. The condensing extraction back-pressure coupling steam extraction integrated system includes a power station boiler, a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder, a steam turbine low-pressure cylinder, a generator, a condenser, a first temperature reducing and pressure reducing device, a pressure matching device, a second temperature reducing and pressure reducing device, a steam heat storage device and a temperature reducing device. Based on the energy cascade utilization principle, integrated design of different steam extraction modes is carried out, so that the thermoelectric decoupling operation capability of the large-scale thermoelectric unit is effectively improved, and the external heating demand is guaranteed; and in addition, while the steam extraction integration is carried out, the pressure matching device and the temperature reducing and pressure reducing devices are coupled to realize the operation of the unit heating under full working conditions and further reduce the loss of the physical working capacity of steam to achieve energy cascade utilization, especially novel condensing extraction back-pressure heating is coupled, so that the utilizationof high-parameter steam is effectively reduced, and full utilization of steam energy is achieved.

Description

technical field [0001] The invention belongs to the technical field of cogeneration of heat and power, and in particular relates to a condensing-pumping back-coupling steam-extraction integrated system used for power peak regulation of thermal power units and an operating method thereof. Background technique [0002] At present, my country's policies are gradually emphasizing the promotion of new energy sources and reducing the proportion of thermal power units, which makes the development of thermal power units face severe challenges. At present, in order to improve the comprehensive energy utilization efficiency of thermal power units and strive for more utilization hours of power generation, the conversion of pure condensing units to heat supply has been widely developed. However, for different industrial steam users, due to their different processes, the required steam pressure parameters are also different. For thermal power units, there is only one main pipeline for ex...

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Problems solved by technology

However, for different industrial steam users, due to their different processes, the required steam pressure parameters are also different. For thermal power units, there is only one main pipeline for external steam supply, that is, only one external steam supply can be provided. steam pressure parameter

As a result: when the external steam supply pressure of the thermal power unit is high, for users who demand low-pressure steam, residual pressure loss is caused; when the external steam supply pressure of the thermal power unit is low, for high-pressure steam demand users, Steam parameters cannot meet the demand

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