Method for producing liquefied natural gas

A technology for liquefied natural gas and products, which is applied in the direction of refrigeration and liquefaction, gas fuel, and irreversible cycle compressors, etc. It can solve the problems of complex structure of pre-cooling compressors, complex structures of propane compressors, and difficult implementation of domestic equipment, etc., to achieve The effect of simple structure, simple design and manufacture, and reduced equipment
CN102115683AInactive Publication Date: 2011-07-06TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
Publication Date
2011-07-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a process for producing liquefied natural gas, which comprises the following steps of: introducing purified feed gas into a first heat exchanger for precooling; introducing the precooled feed gas into a heavy hydrocarbon separator for gas-liquid separation; introducing the separated gaseous fluid into a second heat exchanger, and liquefying to obtain liquid-state fluid; and depressurizing and throttling to obtain the liquefied natural gas, wherein a refrigeration cycle consists of two independent mixed working medium refrigeration cycles in a high temperature area and a low temperature area; the feed gas can pass through a reversing heat exchanger to enter the first heat exchanger; and the separated heavy hydrocarbons and BOG return to the heat exchanger for reheating. In the process, the energy consumption is low; each mixed working medium refrigeration cycle is controlled by only one throttle valve in a cold box, and the operation is simpler; due to the reversing heat exchanger, the production process is more stable and safe; and the cold quantity of the separated heavy hydrocarbons and BOG is fully recycled and discharged out of the cold box, and the energy consumption is reduced.
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Description

technical field

[0001] The invention relates to a method for producing liquefied natural gas, in particular to a method for producing liquefied natural gas by using natural gas, coal bed methane or other methane-rich gas as raw materials. Background technique

[0002] Liquefied natural gas (LNG) refers to a low-temperature liquid mixture formed by liquefying raw material gas (natural gas, coalbed methane or other methane-rich gas) through pretreatment, purification and removal of impurities, and is liquefied by low-temperature cryogenic methods. It is a clean and efficient energy source. After the combustion of natural gas, the emission of sulfur dioxide and dust is reduced by nearly 100%, the carbon dioxide and nitrogen oxides produced are only 50% and 20% of coal, and the pollution is 1 / 4 of liquefied petroleum gas and 1 / 800 of coal. After natural gas is liquefied, its volume is reduced by about 600 times, which can greatly save storage and transportation space and cost, a...

Claims

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