Mixed type steam Rankine combined cycle power generation device

Abstract

The invention relates to a mixed type steam Rankine combined cycle power generation device. A high pressure end steam Rankine cycle and a lower pressure end steam Rankine cycle are directly compounded through a low pressure steam generator 5. Latent heat of vaporization released when a high temperature steam Rankine cycle steam turbine discharges exhaust gas for condensing is completely utilized for power generation of a low temperature end steam Rankine cycle, and therefore load of a traditional steam Rankine cycle system condenser is effectively reduced by more than 20%. System optimization technology is adopted, and cycling absolute thermal efficiency of the whole system is improved by more than 5%. The mixed type steam Rankine combined cycle power generation device not only can be used for energy conservation improvement on an existing machine unit, but also can be used for designing and building a newly built machine unit, and has remarkable economic, social and environmental protection benefits.

Description

technical field [0001] The invention relates to a hybrid 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 is...

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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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