Technology for making LNG (Liquefied Natural Gas) from low-concentration coal bed gas through pressure swing adsorption and cryogenic liquefaction
A pressure swing adsorption, coalbed methane technology, applied in the petroleum industry, gas fuel, fuel and other directions, can solve problems such as increased explosion risk, and achieve the effect of expanding the scope of use
Inactive Publication Date: 2013-06-12
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
View PDF6 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
If the methane content of coalbed methane is lower than 25%, the risk of explosion will be greatly increased in the process of compression to 0.5MPa. Therefore, the current cryogenic liquefaction and concentration of low-concentration coalbed methane has certain limitations.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0028] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0029] Firstly, the specific implementation of the low-concentration coalbed methane pressure swing adsorption plus cryogenic liquefaction purification device suitable for the LNG production process of the present invention will be described.
[0030] Such as figure 1 As shown, the low-concentration coalbed methane pressure swing adsorption and deep cold liquefaction purification device for producing natural gas includes a compression purification system, a liquefaction separation system and a coalbed methane enrichment system 21 arranged in front of the compression purification system along the direction of coalbed gas.
[0031] Such as figure 2 As shown, the coalbed methane enrichment system 21 sequentially includes a blower 1, a cooling device 2 and a pressure swing adsorption device 3 along the direction of coalbed gas flow, as shown ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a technology for making LNG (Liquefied Natural Gas) from low-concentration coal bed gas through pressure swing adsorption and cryogenic liquefaction. The technology comprises the following steps of: (1) enrichment working procedure: to be specific, carrying out methane enrichment on the coal bed gas through a coal bed gas enrichment system, so that the content of methane in the coal bed gas is risen to 35-45% from 10-28%; (2) compression and purification working procedures: to be specific, compressing and purifying the coal bed gas obtained in the enrichment working procedure to obtain a purified coal bed gas; and (3) liquefaction and separation working procedures: to be specific, liquefying and separating a methane component in the coal bed gas to obtain a liquefied natural gas product. The enrichment working procedure is added in conventional working procedures, so that the content of methane is risen to 35-45% from 10-28%, and then the coal beg gas is concentrated, purified, liquefied and separated by using the compression and purification working procedures and the liquefaction and separation working procedures to obtain the natural gas product in the end. According to the method, the using range of the coal beg gas is widened, and the low-concentration coal bed gas with over 10% of methane can be purified to make the liquefied natural gas.
Description
technical field [0001] The invention belongs to the technical field of liquefaction, solidification or separation of gas or gas mixture through pressurization and cooling treatment, and specifically relates to a low-concentration coal bed gas pressure swing adsorption and deep cold liquefaction purification process for preparing LNG. Background technique [0002] Oxygen-containing coalbed methane is the primary by-product pumped out during coal mining to prevent gas explosions and outbursts and ensure safe production in coal mines. Its main component is methane. From its composition content, it can be seen that coalbed methane is an important energy source. and chemical raw materials. However, due to its complex composition, especially the oxygen contained in coalbed methane, it is a very dangerous combustion and explosion-supporting agent, which restricts the comprehensive utilization of oxygen-containing coalbed methane. In practice, in order to save costs, coalbed methane...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 胡千庭姚成林肖露王勇令狐磊
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD