Composite heat exchanger for organic Rankine cycle power generating system

Abstract

The invention discloses a composite heat exchanger for an organic Rankine cycle power generating system. The composite heat exchanger comprises a liquid-phase sensible heat area, a gas-liquid latent heat area and a gas-phase sensible heat area, wherein the cross section area of the liquid-phase sensible heat area, the gas-liquid latent heat area and the gas-phase sensible heat area is different. The composite heat exchanger has the advantages that the liquid-phase sensible heat area, the gas-liquid latent heat area and the gas-phase sensible heat area are separated, optical cross section area of the liquid-phase sensible heat area, the gas-liquid latent heat area and the gas-phase sensible heat area is achieved, certain flow speed is maintained, the heat exchanger is reliable and small in size, the efficiency of the organic Rankine cycle power generating system is improved to the maximum extent, and equipment cost is reduced.

Description

technical field [0001] The invention relates to a composite heat exchanger for an organic Rankine cycle power generation system, belonging to the technical field of mechanical equipment. Background technique [0002] Such as figure 1 As shown, the organic Rankine cycle power generation system is composed of a working fluid pump, evaporator, turbine-generator, condenser, receiving container, etc. The working principle is as follows: firstly, the high-pressure compressed liquid-phase organic working medium is delivered to the evaporator by the working medium pump, and the high-pressure liquid phase delivered to the evaporator is evaporated into a high-pressure gas by the heat source of the evaporator. Subsequently, the high-pressure gas expands into a low-temperature, low-pressure gas through the turbine of the turbo-generator, and powers the turbine, which is transmitted to the generator to generate electricity. The low-temperature, low-pressure operating fluid that becomes...

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Problems solved by technology

[0007] like figure 2 and image 3 The plate-fin heat exchanger shown includes liquid-phase sensible heat zone, gas-liquid latent heat zone and gas-phase sensible heat zone. When the heat exchanger is used, the plate-fin heat exchanger will face the difficult problem of ensuring the best heat exchange effect in all sections

Even if the same fluid medium flows, the flow velocity in the same flow channel is significantly different due to the huge difference in density between the liquid phase and the gaseous state. In addition, the physical properties and heat conduction properties of the three different physical states, including evaporation phenomena, are different. , if one of the phase states is used as a reference object to design the optimal cross-section, the other two phase states will definitely deviate from the optimal cross-section range, and the design method of a single cross-section will reduce the heat exchange efficiency. At the same time, which one to choose There is also difficulty in making a suitable reference

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