Steam extraction type steam Rankine-low boiling point working medium Rankine combined cycle power generation device

Abstract

The invention relates to a steam extraction type steam Rankine-low boiling point working medium Rankine combined cycle power generation device. A low boiling point working medium in a low boiling point working medium Rankine cycle is used for cooling extraction steam in a steam Rankine cycle, latent heat of vaporization of the extraction steam in the steam Rankine cycle is recovered for power generation of the low boiling point working medium Rankine cycle, and therefore the steam Rankine and the low boiling point working medium Rankine cycle are compounded together. At the same time, a safety problem existing when the low boiling point working medium Rankine cycle recovers waste heat of exhaust gas is solved, the waste heat of the exhaust gas is effectively recovered, low temperature corrosion of the exhaust gas is avoided, and the exhaust gas, waste water and the waste heat of the exhaust gas are effectively recovered and utilized. The steam extraction type steam Rankine-low boiling point working medium 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. The steam extraction type steam Rankine-low boiling point working medium Rankine combined cycle power generation device is especially suitable for new construction, extending construction and reconstruction of a power unit in water-deficient areas, power shortage areas and other areas, and therefore the steam extraction type steam Rankine-low boiling point working medium Rankine combined cycle power generation device has remarkable economic, social and environmental protection benefits.

Description

technical field [0001] The invention relates to a steam extraction type steam Rankine-low boiling point working medium 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-te...

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Problems solved by technology

[0006] The Kalina cycle power generation technology mentioned above also has its inherent disadvantages: For example, ammonia is flammable, explosive and toxic. When using the waste heat of flue gas to organize Kalina cycle power generation in the tail flue of boilers or industrial furnaces, it must To consider the leakage caused by dust in the flue gas caused by wear and corrosion of the heat exchanger arranged in the flue, it is necessary to consider the resulting explosion protection and the protection of the environment and working place; the ammonia-water mixture as the working medium Karina cycle, ammonia in ammonia water is a flammable, explosive, toxic medium

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