Method for preparing high methane content gas from coal

A methane content and raw material technology, applied in the field of coal chemical industry, can solve the problems of low concentration of coal water slurry, unfavorable industrial production, increased energy consumption in the conversion process, etc., and achieve the effect of simplifying the process

Active Publication Date: 2010-12-01
ENN SCI & TECH DEV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In their patent CN1654313A, Guo Liejin et al. co-gasified the biomass model and various biomass and coal in supercritical water, but the concentration of coal-water slurry in the experiment was low (<2wt%), which increased the energy consumption of the conversion process
In their patent CN1544580A, Bi Jicheng and others announced the conversion method of low-rank coal in supercritical water, but from the relevant experimental results, the conversion rate of coal is lower than 50%, which is not conducive to industrial production
[0005] In summary, there is no report on the production of methane by gasification of coal in supercritical water.

Method used

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  • Method for preparing high methane content gas from coal
  • Method for preparing high methane content gas from coal
  • Method for preparing high methane content gas from coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 12 g of 80-150 mesh coal powder (see Table 1 for coal quality analysis) and add it to the reactor, and add 1.2 g of potassium hydroxide to the coal powder. Utilize the high-pressure water pump to add in the reactor after the water is preheated by the preheater, and the addition amount is 60ml. Then, the reactor was heated so that the temperature reached 550° C. and the pressure reached 24 MPa, and samples were taken after reacting for 5 minutes, and gas-liquid separation was performed on the gas-liquid mixture obtained by the reaction. The data obtained by analyzing the gas products after catalytic pyrolysis are shown in Table 2.

[0029] Add 0.12g Ni / Al to the reaction residue 2 o 3 60 ml of water was added to the reactor through the preheater. Then, the reactor was heated so that the temperature reached 650° C. and the pressure reached 27 MPa. After reacting for 5 minutes, samples were taken, and the gas-liquid mixture obtained by the reaction was separated i...

Embodiment 2

[0036] Weigh 12g of 80-150 mesh coal powder and add it to the reactor, add 1.2g of potassium carbonate to the coal powder, and then add 60ml of water to the reactor. Then, the reactor was heated so that the temperature reached 550° C. and the pressure reached 24 MPa, and samples were taken after reacting for 5 minutes, and gas-liquid separation was performed on the gas-liquid mixture obtained by the reaction. The data obtained by analyzing the gas products after catalytic pyrolysis are shown in Table 3.

[0037] Add 0.12g Ni / Al to the reaction residue 2 o 3 and 60ml of water. Then, the reactor was heated so that the temperature reached 650° C. and the pressure reached 27 MPa. After reacting for 5 minutes, samples were taken, and the gas-liquid mixture obtained by the reaction was separated into gas and liquid. The data obtained by analyzing the gas product after methanation are shown in Table 3.

Embodiment 3

[0038] Embodiment 3 (comparative example)

[0039] Weigh 12g of 80-150mesh coal powder and add it into the reactor, add 1.2g of potassium carbonate to the coal sample and then add 60ml of water into the reactor. Then, the reactor was heated so that the temperature reached 650° C. and the pressure reached 27 MPa. After reacting for 5 minutes, samples were taken, and the gas-liquid mixture obtained by the reaction was separated into gas and liquid. The data obtained by analyzing the gas after the one-step gasification are shown in the last row of Table 3.

[0040] Table 3 Gas Analysis

[0041]

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Abstract

The invention provides a method for obtaining high methane content gas from coal. In the method, the coal and supercritical water undergo catalytic pyrolysis reaction under the action of a pyrolysis catalyst to form semi-coke, and then the semi-coke and the supercritical water undergo gasification reaction under the action of a methanation catalyst. The high methane content gas can be obtained by the two-step reaction.

Description

technical field [0001] The invention belongs to the field of coal chemical industry. More specifically, the invention relates to a method for obtaining gas with high methane content from coal, in particular to the catalytic pyrolysis of coal in supercritical water and the subsequent gasification process. Background technique [0002] Coal is China's main energy source, with proven reserves of 1 trillion tons, accounting for more than 95% of my country's total reserves of various fossil fuel resources. On the one hand, more than 84% of coal in my country is directly burned as fuel, which not only has low thermal efficiency, but also is currently the most important source of pollution. On the other hand, the domestic demand for natural gas is increasing day by day, and the demand will reach 200 billion cubic meters in 2020, while the natural gas production in the same period can only reach 140 billion to 160 billion cubic meters. In addition, coal-to-natural gas can be transp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08C10J3/64
CPCY02P20/54
Inventor 谷俊杰宋成才张丹王青叶明星谷蔚
Owner ENN SCI & TECH DEV
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