Cascade type steam Rankine combined cycle generating device

Abstract

The invention relates to a cascade type steam Rankine combined cycle generating device which is characterized in that a steam condenser in a steam Rankine cycle of a high-pressure end is used as one of heat sources (i.e. a low-pressure evaporator) of the steam Rankine cycle of a low-pressure end, latent heat of vaporization of steam in the steam Rankine cycle of the high-pressure end is efficiently recovered to be used for steam Rankine cycle power generation of the low-pressure end, and the load of the condenser in a traditional steam Rankine cycle system can be effectively reduced by more than 20% of the absolute value. By adopting a system optimization technology, the cycle absolute heat efficiency of the whole system can be increased by more than 5%. The cascade type steam Rankine combined cycle generating device can be used for reforming the existing unit for saving energy, and for designing and constructing a novel unit, and the cascade type steam Rankine combined cycle generating device has obvious economic, social and environmental benefits.

Description

technical field [0001] The invention relates to a cascade steam Rankine combined cycle power generation device, specifically belonging to the technical field of thermal power plant power devices. Background technique [0002] A thermal power plant that uses water vapor as a working medium is a large-scale factory that converts thermal energy into mechanical energy, and then converts mechanical energy into electrical energy. The cycle applied in power plants is very complicated, but in essence, it is mainly completed by the Rankine cycle composed of boilers, steam turbines, condensers, water pumps and other equipment. The working principle is: the feed water is first pressurized by the feed water pump and then sent Into the boiler, the water in the boiler is heated and vaporized to form high-temperature and high-pressure superheated steam. The superheated steam expands and does work in the steam turbine and becomes low-temperature and low-pressure exhaust steam. Finally, it i...

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Problems solved by technology

Although this part of waste heat resources is a huge waste, it is difficult to recycle it. The main reasons are: (1) The quality of waste heat is low, and no effective utilization method has been found; (2) Recovery of this part of waste heat is often harmful to boilers. It is risky to make major changes to the original thermal system; (3) The heat balance problem is difficult to organize, and it is difficult to use it directly in the factory. It is often necessary to look for suitable heat users outside, and the heat load of heat users is often Will fluctuate, limiting the generalizability of the recovery method

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