Boiling heat exchange experimental device for promoting uniform heating of low-temperature mixed working medium

Abstract

The invention discloses a boiling heat exchange experimental device for promoting uniform heating of a low-temperature mixed working medium. The device comprises a liquid storage tank, a working medium mixing tank, a gear pump, a filter, a mass flow meter, a temperature sensor, a pressure sensor, a direct-current stabilized power supply, a vacuum cover, a vacuum pump, an experiment section, a dataacquisition system, a computer, an ultrasonic particle detection device, a gasifier and the like. The experiment section includes a film coated steel pipe. The carbon nanotube film (CNTF) which is low in cost, simple in preparation process, high in toughness, light in dead weight and stable in electric heating performance is adopted as a heating device, so that compared with a common mode that anelectric heating wire is wound on the outer wall of the steel pipe, the carbon nanotube film (CNTF) is attached to the inner wall of the steel pipe, and a mixed working medium can be heated more uniformly; and errors generated by calculating the measurement results of the heat flux density and the outer wall temperature when the inner wall temperature of the circular tube is calculated and combining with the heat conductivity coefficient of the material used by the circular tube can be effectively avoided, so that the accuracy of boiling heat exchange experiment data is improved. The method is suitable for carrying out heat exchange coefficient and pressure drop experiment research on the mixed working medium, and quantitative influence rules and mechanisms of the heat exchange coefficient and the pressure drop of the mixed working medium along with factors such as the inlet temperature, the heat flux density and the mass flow rate are obtained through measured experiment data.

Description

technical field [0001] The invention relates to a boiling heat transfer experimental device that promotes the uniform heating of low-temperature mixed working fluids, and can more accurately measure the boiling heat transfer characteristics of the flow in the tube compared with the previous experimental research. Background technique [0002] Since the LNG receiving station needs to be heated to gasify it before being exported, and a large amount of cold energy will be generated during the gasification process, so specific processes and technologies can be used to improve the cold energy utilization rate of the LNG receiving station. LNG cold energy power generation technology converts cold energy into mechanical energy through a thermodynamic cycle, and then converts it into electrical energy for transmission and use. By combining the research status at home and abroad, it can be found that in the more common low-temperature power generation technologies, the organic Rankin...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a boiling heat transfer experimental device that promotes the uniform heating of low-temperature mixed working fluids, and solve the lack of corresponding experimental research on the heat transfer characteristics of multi-component mixed working fluids at low temperature in LNG cold energy power generation technology The problem

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