An experimental device for lng low temperature flow characteristics

Abstract

The invention discloses a liquefied natural gas (LNG) low-temperature flowing characteristic experimental device. The LNG low-temperature flowing characteristic experimental device includes an LNG storage tank, a bottom cut-off valve, an LNG unloading inlet, an unloading cut-off valve, a nitrogen inlet, a pressure gauge, an LNG pump, a temperature sensor, a vaporizer inlet cut-off valve, a vaporizer, a three-way joint test unit, a bend test unit, a valve test unit, a heat preservation test unit, an upper evacuation pipe, an upper end cut-off valve, a top end evacuation pipe, a top end cut-off valve and a flowing state test unit. With the LNG low-temperature flowing characteristic experimental device of the invention adopted, the flowing state and physical property parameters of LNG in a pipeline can be observed, and the loss of resistance passing through a bend, a valve and a three-way joint can be measured, and heat preservation effects of different heat preservation materials can be measured, and the characteristic parameters of the LNG pump can be measured. The LNG low-temperature flowing characteristic experimental device has the advantages of compact structure and high universality.

Description

technical field [0001] The invention belongs to the technical field of liquefied natural gas transportation, and in particular relates to an experimental device for LNG low-temperature flow characteristics, in particular to an experimental device for measuring the flow state of LNG at low temperature and the resistance loss of flowing through elbows and valves. Background technique [0002] The world's energy structure has changed, and environmental problems have become increasingly prominent. The search for cleaner energy has gradually become the focus of various researches. Natural gas is more and more favored by various countries due to its unique advantages, but initially it was mainly CNG (Compressed Natural Gas, CNG) used for short-distance vehicles; with the development of technology, in recent years, liquefied natural gas (LNG) has gradually begun Used by people, LNG has expanded the scope of use of natural gas, and has begun to be widely used in long-distance freigh...

AI Technical Summary

Problems solved by technology

In the design and development process of LNG filling station, there is no accurate calculation method for the loss of LNG pipeline and the flow loss of LNG medium flowing through valves, elbows and tees. Therefore, the LNG low temperature experimental device is proposed. It can measure the pipeline loss and local loss of LNG pipeline

[0004] The existing LNG low-temperature experimental devices include: LNG test tank device and LNG self-pressurization device, but the LNG test tank device only studies the insulation effect of different thicknesses of the insulation layer, and the LNG self-pressurization device only considers a single working condition of pressurization

Since it is necessary to carry out matching research on pipeline characteristics and pumps in LNG gas filling stations, it is necessary to accurately calculate pipeline losses. The calculation of the flow loss has not been an accurate test method

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