Testing system for researching flow boiling heat transfer character and pressure drop character of cryogenic fluid

Abstract

The present invention provides a testing system for researching flow boiling heat transfer character and pressure drop character of cryogenic fluid, which belong to the technical field of cryogenic engineering and cryogenic technique. The testing system comprises a cryogenic self-pressurized storage tank, a nitrogen steel cylinder, a liquid nitrogen steel cylinder, a wide-mouth dewar, a cooling coil, an electric heating device, heat exchange equipment to be tested, a test vacuum dewar, a temperature transducer, a pressure transducer, a differential pressure transducer, a vaporizer and a gas flowmeter. The cryogenic self-pressurized storage tank is used as a pressurization device in the testing system and cryogenic fluid is outputted under a certain pressure, which can simplify the testingsystem. The heat exchange equipment to be tested is arranged in the test vacuum dewar for reducing heat loss in the testing. A vacuum valve is arranged in the test vacuum dewar and can be connected to outer high pressure nitrogen for blowing the inner part of the test vacuum dewar when necessary, which can improve the system safety. The testing system has the advantages of less land occupation, small investment, simple control, easy operation, safe, reliable and applicability to various cryogenic fluids including flammable and explosive cryogenic fluids.

Description

technical field : [0001] The invention relates to a test system for studying flow boiling heat transfer characteristics and pressure drop characteristics of low temperature fluids, in particular to a test system for flow boiling heat transfer of various low temperature fluids with a saturation temperature above 77K, including flammable and explosive low temperature fluids A test system for characteristics and pressure drop characteristics belongs to the field of cryogenic engineering and cryogenic technology. Background technique: [0002] The research on the flow boiling heat transfer characteristics and pressure drop characteristics of cryogenic fluids is one of the most important basic researches in the field of low temperature. Understanding the flow boiling heat transfer characteristics and pressure drop characteristics of cryogenic fluids is helpful for guiding related cryogenic fluid heat exchangers, such as The optimal design of vaporizer and evaporator is very impor...

AI Technical Summary

Problems solved by technology

The above-mentioned test systems all have the following deficiencies: 1) The power source is set separately in the system, the system is complicated and the investment is large; 2) The cryopump or high-pressure nitrogen is used as the power source, and the ability to adjust the evaporation pressure in a wide range is limited; 3) The overall system The integration is high, and the application of the test platform is relatively single, which is not suitable for testing a variety of low-temperature fluids; 4) It is difficult to replace the specific heat exchange equipment to be tested in the test system; 5) When there is a fluid leak in the system, there is no emergency treatment device, Not suitable for flammable and explosive cryogenic fluid tests

These deficiencies greatly limit the experimental and theoretical research on the flow boiling heat transfer characteristics and pressure drop characteristics of cryogenic fluids, and also affect the research and application of related low temperature heat exchange equipment.

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