Falling-film evaporator and organic Rankine cycle power generating system using same

Abstract

A falling-film evaporator and an organic Rankine cycle power generating system using the same. The invention discloses the falling-film evaporator and the organic Rankine cycle power generating system. The falling-film evaporator comprises a tubular body, wherein the tubular body is provided with a working medium inlet and a working medium outlet, a distributor and a heat exchange tube are arranged in the tubular body, an oil return device is arranged at the bottom of the tubular body and comprises a float oil catcher which can float in an oil-rich layer in the bottom of the tubular body, the float oil catcher is connected with a caught oil delivery tube, and the caught oil delivery tube is connected to the exterior of the tubular body. According to the falling-film evaporator and the organic Rankine cycle power generating system, disclosed by the invention, the oil return device is simple in structure and reliable in oil return.

Description

technical field [0001] The invention relates to the technical field of power generation systems, in particular to a falling film evaporator and an organic Rankine cycle power generation system using the falling film evaporator. Background technique [0002] At present, the falling film evaporator has the advantages of excellent heat transfer performance, less working fluid charge, and high heat transfer efficiency, and has been widely used. [0003] There are two main types of existing falling film evaporators, refer to figure 1 , the first type is a hybrid falling film evaporator 1, a layer of distribution plate 12 is set, only part of the tube bundles can be evaporated in falling film type, and the rest of the tube bundles are flooded evaporation, and an oil return port 11 is set at the bottom. The falling film evaporator with this structure cannot fully realize the falling film evaporation, causing the working fluid to accumulate at the bottom of the heat exchanger, and ...

AI Technical Summary

Problems solved by technology

The structure of the existing oil return method is complex, and the oil separator 6 is installed at the outlet of the expander 2, which will increase the outlet back pressure of the expander 2 and reduce the expansion power of the expander 2

In addition, it is necessary to add an oil pump 7 to raise the lubricating oil from low pressure to high pressure, which increases the internal friction of the entire power generation system

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