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

Abstract

The invention relates to a steam Rankine-low boiling point working medium Rankine combined cycle power generation device. Steam in a steam Rankine cycle is cooled through low boiling point working mediums such as a low boiling point working medium in an ammonia vapor Rankine cycle, latent heat of vaporization of the steam in the steam Rankine cycle is recovered for power generation of a low temperature working medium cycle, and therefore the steam Rankine and the low boiling point working medium Rankine cycle are compounded together. At the same time, safety problem of recovering of waste heat of the low boiling point working medium Rankine cycle is solved, exhaust gas temperature is effectively reduced, low-temperature corrosion of the exhaust gas is avoided, and the exhaust gas, waste water and the waste heat of exhaust steam of a steam Rankine cycle system are effectively recovered and utilized. The 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 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 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 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-temperature and low-pres...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the shortcomings of the technologies such as the above-mentioned steam Rankine cycle and Karina cycle, and propose a steam Rankine-low boiling point working medium Rankine combined cycle power generation device, which can replace the traditional steam Rankine cycle unit, At the same time, it solves the key problem of the safe operation of the low-boiling-point working medium Rankine cycle unit and the problem of recovering a large amount of latent heat of vaporization released when the steam condenses in the condenser. The positive pressure operation mode of the condenser is adopted to recover the steam in the steam Rankine cycle. The latent heat of vaporization during condensation is used for low-boiling-point working fluid Rankine cycle power generation at the low temperature end, so as to effectively improve the thermal efficiency of the entire combined cycle unit, and ultimately achieve the goal of saving energy and reducing consumption and improving the thermal efficiency of the system

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