Mixed refrigerant circular liquefied natural gas self-purification system
A technology of mixing refrigerants and circulating liquefaction, applied in refrigeration and liquefaction, liquefaction, solidification and other directions, can solve problems such as reducing heat exchange efficiency of heat exchangers, damage to product valves and compressors, increasing operating costs, etc. The effect of improving stability and improving heat exchange efficiency
Active Publication Date: 2018-04-17
益通天然气股份有限公司
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Problems solved by technology
Therefore, the purity of the five components decreases, which leads to high energy consumption and increased operating costs
[0004] At the same time, the critical temperature of helium is -267.8°C, the critical temperature of nitrogen is -146.9°C, and the lowest temperature in the MRC cycle cannot liquefy helium. Therefore, the presence of helium will cause gas-liquid two-phase flow at the throttle valve, which will affect the product valve. and the compressor cause damage, while the presence of helium will reduce the heat transfer efficiency of the heat exchanger
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Embodiment 2
[0026] Such as figure 1 , image 3 As shown, the flow regulating valve is used to control the flow rate of the purifier. At this time, the gas phase separated from the final stage separation tank V3 enters the heat exchanger group E1, and part of it enters the purifier tank V7, and the liquid phase outlet of the purifier tank V7 passes through the final stage. The gas-phase throttling valve FCV2 is connected to the liquid separator tank V6 of the stage III heat exchanger, and the other part is directly throttled and cooled by the flow regulating valve FCV3 and then connected to the liquid separator tank V6 of the stage III heat exchanger. All the other are the same as the first embodiment.
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The invention relates to a mixed refrigerant circular liquefied natural gas self-purification system, belongs to the technical field of chemical engineering and low temperature engineering and provides a mixed refrigerant circular liquefied natural gas self-purification system for utilizing a purifier to improve purity of a mixed refrigerant. Low-temperature environment of an MRC system is utilized for separating out impurity gas like helium which cannot be liquefied in the system, stability of a throttling valve is improved, gas-liquid two-phase flow in front of the throttling valve is prevented, then heat exchange efficiency of a heat exchanger is improved, and the system is widely used for purifying liquefied natural gas.
Description
technical field [0001] The invention relates to a self-purification system of mixed refrigerant circulation liquefied natural gas, which belongs to the technical field of chemical engineering and cryogenic engineering. Background technique [0002] With the rapid development of the economy, the demand for energy is increasing, especially the demand for clean energy is gradually increasing. Natural gas is widely used as a clean energy source, and natural gas storage and transportation are an important part of the natural gas industry. With the development of technology, various types of natural gas transportation and storage have emerged, such as CNG (compressed natural gas), LNG (liquefied natural gas) and other forms. At present, there are many liquefaction technologies for LNG, such as cascade liquefaction process, mixed refrigerant liquefaction process, liquefaction process with expander, etc. Each process has its own advantages and disadvantages. [0003] The MRC mixed ...
Claims
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IPC IPC(8): F25J3/08
Inventor 刘建栋毕亮
Owner 益通天然气股份有限公司