Compact And Efficient Microchannel Heat Exchangers Study On Industrial Test System

As the world’s largest energy consuming country and the largest shipbuilding country in the world,my country started relatively late in the research of FLNG platform design and construction technology.However,in order to develop my country’s abundant marine energy,the state has made the development of FLNG-related technologies and equipment a priority development direction in the strategic emerging industry development plan of the"Twelfth Five-Year"period and the medium-and long-term technological development strategy.As one of the key equipment in this field,it has attracted much attention.In addition,in the fields of ship oil-to-gas and liquefied natural gas engineering,compact and efficient micro-channel heat exchangers have also received more and more attention and applications.The design and production technology of LNG micro-channel heat exchangers is monopolized by foreign countries.At present,domestic Research on the test system of the heat transfer performance of LNG microchannel heat exchangers is relatively scarce.In this thesis a new type of micro-channel heat exchanger prepared by additive manufacturing technology is used as the test object.On the basis of the structural optimization design of this type of micro-channel heat exchanger and the performance test of the laboratory substitution medium,the industrialized test system is designed.As the main heat exchange media,LNG and propane are subjected to a comprehensive thermodynamic performance test,and at the same time,it provides technical support for the serial design of the micro-channel heat exchanger in the future.The specific research work is as follows:（1）Analyze the current research status of the heat transfer performance of the microchannel heat exchanger and its test system,and sort out the current research status of the heat exchanger performance test under sloshing conditions,and clarify the existing microchannels prepared by additive manufacturing.The background and significance of the industrialization test of the heat exchanger.（2）The compact and high-efficiency micro-channel heat exchanger prepared based on3D printing technology,clarify the overall design goal,test purpose,test principle and test data processing method of the test system,refer to the typical FLNG/FSRU roll transfer function RAO and major sea areas in the world Preliminary estimation of the law of roll motion response under the wave environment conditions.It is determined that the rocking period of the rocking table used in the test is 5s～20s,and the rocking angle is 5°～15°.The overall structure and main functions of the microchannel heat exchanger industrialized test system are designed.（3）According to the rated working conditions of the micro-channel heat exchanger test and the test requirements of variable working conditions,the main equipment used in the system is reasonably selected,and the N₂expansion refrigeration cycle process is adopted to complete the natural gas recovery treatment of the test system,and the design is completed.The placement plan of the equipment on the rocking table and the heat preservation plan of the test system pipeline,and use the 3D design software Solid Works to complete the modeling of the microchannel heat exchanger test bench,which is used as a template to guide the on-site construction of the test system,thereby improving the installation and testing of the test equipment The efficiency of platform construction.（4）Clarify the test system to-be-tested signals and control objects,make reasonable selection and layout of sensor elements,complete the design of data collection schemes for test system temperature,pressure,tank level,etc.,as well as LNG/LN2 unloading and pressurization modules Design of control scheme,LNG/LN2 vaporization module control scheme and propane cycle module control scheme.（5）Analyze the potential safety hazards in the system from the four aspects of test environment,management,medium used and test personnel,divide the industrialized test system into seven safety assessment units,and select the pre-hazard analysis and safety checklist method to complete the analysis of each Safety assessment of each evaluation unit,and formulate corresponding test site operation specifications and hazard response measures,and complete the construction of the safety system for the industrial test of microchannel heat exchangers.This paper studies the micro-channel heat exchanger test system with propane as the intermediate heat transfer medium,and solves the problems of traditional low-temperature vaporization equipment due to the low initial temperature of the heat exchange medium,which leads to the deterioration of the heat exchanger’s vaporization performance.The industrial experiment design of other new micro-channel heat exchangers provides reference.