Technology for producing methane through low-rank coal

A technology of low-rank coal and methane production, which is applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of low thermal energy utilization rate and large hydrogen consumption, and achieve the effect of high thermal efficiency and low hydrogen consumption

Inactive Publication Date: 2013-02-06
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem of large hydrogen consumption ...

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  • Technology for producing methane through low-rank coal

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Embodiment 1

[0028] Implement the technology of a kind of low-rank coal methane production provided by the present invention, take the technological process of producing 1,100,000,000 cubic meters of methane as an example, and its described specific technology is to carry out according to the following steps:

[0029] In this embodiment, lignite is used as raw material, and the basic coal quality analysis of the lignite used is shown in Table 1. 17,800 tons / day lignite raw coal was crushed, sieved to 3-6mm, and dried and dehydrated at 150°C to obtain dry lignite with a moisture content of 8% (wt%). The amount of dry lignite in the pyrolysis reactor is 16,000 tons / day. Dried lignite stays in the pyrolysis reactor at a pyrolysis temperature of 600°C for 1.5 hours, and the products obtained are pyrolysis semi-coke and pyrolysis gas containing tar, of which the output of pyrolysis semi-coke at 600°C is 10,000 tons / day, the pyrolysis gas is cooled and separated to obtain about 1900 tons / day o...

Embodiment 2

[0046] Implement a process for producing methane from low-rank coal provided by the present invention, a process flow with an annual output of 600 million cubic meters of methane. Its described specific technique is carried out according to the following steps:

[0047] In this embodiment, long-flame coal is used as raw material, and its specific analysis is shown in Table 5. The long-flame coal with a particle size of 5-10mm is fed into the pyrolysis reactor, and the feeding amount is 5000 tons / day. The residence time of long-flame coal in the pyrolysis reactor is 2.5 hours. After pyrolysis, 650°C pyrolysis semi-coke and pyrolysis gas containing tar are obtained. The output of 650°C pyrolysis semi-coke is 4028 tons / day. After cooling and separating the pyrolysis gas, about 273 tons / day of low-temperature fuel-type tar can be obtained. The purified pyrolysis gas is 500,000 Nm3 of pyrolysis gas. The composition and volume content are shown in Table 6.

[0048] The pyrolysis s...

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Abstract

A technology for producing methane through low-rank coal is that the low-rank coal is pyrolyzed so as to obtain pyro-char and pyrolysis gas which contains tar. The pyrolysis gas which contains the tar is cooled and separated so as to obtain the tar, water and the pyrolysis gas; the pyro-char is fed into a methanator, the easily reactive pyro-char is reacted with circulated hydrogen at a high temperature and a high pressure so as to obtain methanation gas, and the difficult reactive pyro-char is fed into a gasification reactor to be reacted with water vapor and oxygen, so that gasification gas is produced. The methanation gas and the gasification gas are used as heat sources to directly supply heat for the pyrolytic reaction of feed coal in a pyrolysis reactor. The pyrolysis gas and the gasification gas are separated or mixed to be converted, decarbonized and separated, so that hydrogen-rich gas is obtained, and the pyrolysis gas and the methanation gas are subjected to heat exchange, purified and separated to obtain the hydrogen-rich gas, so that hydrogen sources are provided for a methanation unit. The substitute natural gas which is produced by the technology has the advantages of high thermal efficiency, low hydrogen consumption, quick methanation reaction speed and the like.

Description

technical field [0001] The invention relates to a process for producing methane from low-rank coal, in particular to a process for producing methane from low-rank coal through drying, pyrolysis, pyrolysis semi-coke methanation and methanation residue gasification. technical background [0002] my country's demand for natural gas is rising rapidly, and the supply gap is increasing day by day. It is estimated that the average annual growth rate of my country's natural gas demand will reach 15% before 2030, when my country's natural gas demand will reach 400-500 billion m3, of which about 50% will depend on imports. Insufficient natural gas supply will directly affect my country's economic construction and social development. my country is relatively rich in low-rank coal resources. Coal-to-natural gas is an important way to transform coal resources and a powerful means to realize natural gas supplementation. [0003] The existing document CN102344841A discloses a "method for...

Claims

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Application Information

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IPC IPC(8): C10L3/08
Inventor 张永发张天开丁晓阔徐英陈磊李香兰
Owner TAIYUAN UNIV OF TECH
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