Process for liquefying high methane gas

A methane gas and methane-enriched technology, applied in liquefaction, refrigeration and liquefaction, gas fuel, etc.

Inactive Publication Date: 2009-03-25
陈文煜 +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] Due to the increasing demand for methane-enriched gas energy, the development and supply of methane-enriched gas resources has become increasingly urgent, and the market demand for methane-enriched gas liquefaction technology has increased. However, there is currently no methane-enriched gas liquefaction technology for large-scale liquefied natural gas plants in China , all liquefaction technology and proprietary equipment need to be obtained from abroad, which is extremely unfavorable for the country to obtain methane-rich gas resources as soon as possible and enhance the international competitiveness of methane-rich gas energy companies. This invention is developed under this background. Economical, efficient, easy-to-operate and maintain methane-rich gas (such as natural gas) liquefaction technology

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  • Process for liquefying high methane gas

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Embodiment Construction

[0050] Example: In order to clarify an embodiment of the present invention, by calculating the heat and material balance of the process from methane-enriched gas to liquefied methane, the optimized implementation of the present invention is simulated to produce 4 million tons of LNG production line per year. see figure 1 .

[0051] The qualified methane-enriched feed gas after pretreatment is 30800kmol / h. At a pressure of 5.9MPa and a temperature of 50°C, it passes through the precoolers E103, E105, E104, E102, and E101 in sequence from pipeline 2, and the methane-enriched gas is precooled to -33°C .

[0052] The raw material gas stream containing condensate enters the demethanizer T1501 through the pipeline 523, and most of the heavy hydrocarbon components are separated in the demethanizer, and the methane-enriched gas at the top of the tower enters through the pipeline 18 at a pressure of 5.3MPa and a temperature of -35°C. The first main heat exchanger E200, after being co...

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Abstract

The invention discloses a process for liquefying rich methane gas such as natural gas, which comprises a pure component cooling circulating system of the separation of heavy hydrocarbon in the rich methane gas, the liquefaction and denitrification of the rich methane gas and the cold quantity supplying. The process flow has good reliability and strong adaptability to the change of material composition of the rich methane gas; according to the changes of material gas composition and flow rate, the flow rate and the blending ratio of refrigerant can be flexibly adjusted, the requirement on the necessary equipment is low, and higher efficiency and low investment are realized.

Description

technical field [0001] The invention relates to a process of liquefying methane-enriched gas, and proposes a complete process for liquefying methane-enriched gas after pretreatments such as deacidification, dehydration, and mercury removal, such as natural gas, including the separation of heavy hydrocarbons in methane-enriched gas , Liquefaction of methane-rich gas, denitrification, and a mixed-component refrigeration cycle system that provides cooling capacity. Background technique [0002] Methane-rich gas, defined here as gasification including natural gas, coalbed methane, and natural hydrates, is increasingly being used as a clean fuel. It's not economical to transport the gas over long distances, and it's not even possible to do so when it needs to cross oceans, and it's also uneconomical to store large quantities of methane-rich gas in its gaseous state. [0003] It is an economical way to cool methane-enriched gas to a liquid state to obtain a liquid product, namely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/06F25J1/02C10L3/10
CPCF25J1/0022F25J1/0042F25J1/0055F25J1/0212F25J1/0238F25J1/0262F25J1/0268F25J2210/06F25J2220/62F25J2220/64F25J2230/08F25J2230/60F25J2270/12F25J2270/60
Inventor 陈文煜田文德
Owner 陈文煜
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