A low-energy natural gas liquefaction method
A technology of natural gas and low energy consumption, applied in the field of natural gas liquefaction with low energy consumption, can solve the problems of less freedom, insufficient response, difficulty, etc., and achieve the effects of increasing heat transfer temperature difference, optimizing refrigerant composition, and reducing energy consumption
Active Publication Date: 2018-10-16
CHINA PETROLEUM & CHEM CORP +2
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Problems solved by technology
[0004] In the conventional natural liquefaction process, the mixed refrigerant is only flashed to the compressor after being used in the cold box, and the entire refrigerant cycle does not change the operating conditions such as refrigerant composition, and the degree of freedom of the entire system is less. The adaptability to raw materials is very limited, and the load and temperature level distribution between the stages is adjusted by adjusting the composition of the refrigerant, which is very complicated and the response is not fast enough
Especially in the case of a large range of heavy hydrocarbons, the operation of the refrigeration system varies greatly, which is very difficult
Method used
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Embodiment
[0053] like figure 1 as shown,
[0054] After the mixed refrigerant comes out of the cold box, it enters the first-stage suction tank D-201 of the mixed refrigerant compressor, and then enters the first-stage K-201-1 of the mixed refrigerant compressor. After the compressed gas is cooled by the first-stage outlet cooler E-201, Together with the mixed refrigerant from the cold box, it enters the second-stage suction tank D-202 of the mixed refrigerant compressor, and continues to be compressed by the second-stage K-201-2 of the mixed refrigerant compressor, and the compressed gas passes through the second-stage outlet cooler After E-202 is cooled, it enters the three-stage suction tank D-203 to separate the heavy refrigerant in the liquid phase, and the gas phase continues to be compressed by the three-stage K-201-3 of the mixed refrigerant compressor, and the three-stage outlet cooler E-203 After cooling, the light refrigerant in the gas phase and the intermediate refrigerant...
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The invention discloses a low-energy consumption natural gas liquefaction method. A refrigerating system employs a three-section mixing refrigerant refrigerating compressor; a liquid phase produced after cooling of the mixed refrigerant compressor is heavy-refrigerant; a gas phase continues to conduct three-section compression by the compressor; a liquid phase produced after cooling of the mixed refrigerant compressor is a middle-refrigerant and a gas phase is a light refrigerant; the heavy-refrigerant, the middle refrigerant and the light refrigerant respectively enter different flow paths of a cold tank for condensation and over-cooling; flash evaporation is conducted to a first section and second section of the compressor by the three refrigerants, so cooling capacity is provided for the cold tank; and pre-cooling, condensation and overcooling to the natural gas can be completed. By the use of the low-energy consumption natural gas liquefaction method, thermodynamic efficiency can be improved and energy loss can be reduced.
Description
technical field [0001] The invention relates to the field of natural gas production, in particular to a method for liquefying natural gas with low energy consumption. Background technique [0002] As an environmentally friendly fuel, natural gas is one of the fastest growing energy sources in the world. It is estimated that natural gas consumption can grow at an average annual rate of 1.6% from 2008 to 2035. The natural gas liquefaction plant cools natural gas down to -162°C under normal pressure to form liquefied natural gas. The volume of liquefied natural gas is nearly 600 times smaller than that of gas, which is convenient for long-distance transportation and trade. Natural gas liquefaction plants need to consume a lot of energy and investment, and the field of natural gas liquefaction is both energy-intensive and investment-intensive. Facing the ever-increasing energy consumption cost, how to reduce the energy consumption of the device is the primary problem faced by...
Claims
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IPC IPC(8): F25J1/02
CPCF25J1/0022F25J1/0055F25J1/0212F25J2220/64
Inventor 李广华彭勃赵百仁刘永莉高斌赵春凤刘侃
Owner CHINA PETROLEUM & CHEM CORP