Organic Rankine cycle power generation system based on multi-stage evaporator and working medium pump in series

Abstract

The invention discloses an ORC power generation system based on series connection of multistage evaporators and working medium pumps. The system comprises n evaporators, wherein the n evaporators are connected in series sequentially on a heat source side; a heat source fluid enters a first evaporator, is discharged from a last evaporator and is recharged to the underground; except that an upper outlet is formed in the working medium side of the first evaporator, an upper outlet and a lower outlet are formed in each of the other evaporators; the upper outlet of each evaporator is connected to n inlets of a steam turbine in parallel; an outlet of the steam turbine is connected with a preheater and a condenser in series; a working medium enters the preheater and the condenser, and then enters the other side of the preheater again and exchanges heat with exhaust steam exhausted by the steam turbine after working; and each evaporator is equipped with a working medium pump, but the work medium is supplied to each evaporator through a series connection manner, so that the working medium closed cycle adopting series connection of the multistage evaporators and the working medium pumps is formed. The power generation system overcomes the defect that a single evaporator in a conventional ORC system is irreversible and has large loss, and improves the utilization efficiency and the technical economy of the system.

Description

technical field [0001] The invention belongs to the field of thermal energy engineering, and mainly relates to a thermoelectric conversion system device adopting an organic Rankine cycle mode. Background technique [0002] The Organic Rankine Cycle is a way of using organic working fluid as a thermal cycle. Geothermal energy, solar energy or other low-grade heat sources are used to heat the organic working fluid to generate steam to drive the turbogenerator to generate electricity. Organic Rankine Cycle (Organic Rankine Cycle, referred to as ORC) heat source fluid inlet temperature is usually above 80 ℃, the evaporator is the component that produces the largest irreversible loss in ORC, especially when the enthalpy drop at the inlet and outlet of the heat source fluid is high, the evaporator The irreversible loss will further increase. Therefore, the multi-stage evaporator is reasonably set up to connect the heat source fluid with the evaporators at all levels, so that the ...

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Problems solved by technology

[0003] The object of the present invention is to provide an organic Rankine cycle power generation system based on multi-stage evaporators connected in series with working medium pumps. For heat source fluids with large enthalpy drops, multi-stage evaporators are connected in series to compensate for the irreversibility of ORC evaporators. The problem of large losses, to achieve the purpose of improving power generation efficiency

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