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Process flow for liquefying high methane gas

A process flow, methane gas technology, applied in the field of pure component refrigeration cycle system

Inactive Publication Date: 2012-12-05
陈文煜 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 flow for liquefying high methane gas

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Embodiment Construction

[0048] Example: In order to clarify an embodiment of the present invention, by calculating the heat and material balance of the process flow from methane-enriched gas to liquefied methane, the optimized implementation of the present invention is simulated to produce an LNG production line of 5 million tons per year. see figure 1 .

[0049] The qualified methane-enriched feed gas after pretreatment is 36000kmol / h. At a pressure of 6.0MPa and a temperature of 50°C, the methane-enriched gas is pre-cooled to - 33°C.

[0050] The raw material gas stream containing condensate enters the demethanizer T101 through the pipeline 7, 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 8 at a pressure of 5.5MPa and a temperature of -35°C The first main heat exchanger E800, after being cooled by ethane refrigerant, the temperature is -66°C, leads out of the first main heat exchange...

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Abstract

The invention discloses a process flow 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 rich methane gas; and 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 onthe necessary equipment is low, and higher efficiency and low investment are realized.

Description

technical field [0001] The invention relates to a process flow for liquefying methane-rich gas, and proposes a process for liquefying methane-rich gas, such as natural gas, after pretreatments such as deacidification, dehydration, and mercury removal, including the separation of heavy hydrocarbons in methane-rich gas, Pure component refrigeration cycle system for liquefaction of methane-rich gas, denitrification, and 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 liquefied natural gas, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J1/02
CPCF25J1/0022F25J1/0035F25J1/0052F25J1/0072F25J1/0082F25J1/0085F25J1/0207F25J1/0238F25J1/0254F25J1/0262F25J1/0263F25J1/0268F25J2220/62F25J2220/64F25J2230/08F25J2230/20F25J2270/12F25J2270/60
Inventor 陈文煜其他发明人请求不公开姓名
Owner 陈文煜