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Catalytic deoxidation process of oxygen-contained coal bed gas

A technology for catalytic deoxidation and coalbed methane, applied in the chemical field, can solve the problems of increasing the resistance drop of the bed layer, reducing the CH recovery rate, and the large volume of the reactor equipment, and achieving the effects of avoiding the reaction temperature, improving the recovery rate, and increasing the processing capacity.

Inactive Publication Date: 2009-12-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Higher reaction temperature increases CH 4 Chances of side reactions occur, reducing CH 4 Recovery rate; the lower reaction space velocity will make the reactor equipment bulky and increase the cost of coalbed methane deoxygenation
In addition, the use of non-precious metal catalysts will make it difficult to start the catalytic deoxygenation reaction; granular catalysts increase the resistance drop of the bed, which is not conducive to the coalbed methane deoxygenation process with low inlet pressure
The above problems all reduce the feasibility of the catalytic deoxidation process technical solution

Method used

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  • Catalytic deoxidation process of oxygen-contained coal bed gas
  • Catalytic deoxidation process of oxygen-contained coal bed gas

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Embodiment 1- Embodiment 8

[0052] Embodiment 1-embodiment 8 has provided different coalbed methane product gas circulation modes and different coalbed methane raw material gas O in the technique of the present invention 2 Concentration, reaction bed inlet temperature, outlet temperature, inlet pressure, circulation ratio R, reaction space velocity and other operating process parameters on the composition of deoxidized coalbed methane product gas, wherein embodiment 6 and embodiment 8 are comparative examples, not included in the present invention protected list.

[0053] The catalysts used in experiments in embodiment 1-embodiment 8 are all weight percentages and consist of 0.2%Pd / 15%CeO 2 -5%La 2 o 3 / 79.8% cordierite honeycomb ceramic monolithic catalyst. CH in feed gas and product gas 4 , N 2 , CO 2 , CO and H 2 Detection by gas chromatography thermal conductivity detector; O in feed gas and product 2 by PROLINE Process mass spectrometer online detection.

[0054] In the experiment, firstl...

Embodiment 9- Embodiment 12

[0060] Embodiment 9-Example 12 give a comparison of the ignition and start-up performance of the catalytic deoxygenation reaction process system under different conditions. The catalyst used in the experiment is 0.2%Pd / 15%CeO by weight percentage 2 -5% La 2 o 3 / 79.8% cordierite honeycomb ceramic monolithic catalyst, the volume space velocity of the ignition gas source is 5,000hr -1 . It can be seen from the experimental data in Table 2 that, for the raw material gas of oxygen-containing coalbed methane (comparative example 12), under the conditions of this experiment, the deoxidation reaction can only be started if it is preheated to above 280°C. Adding a preheater to preheat the reaction raw materials before the deoxidizer undoubtedly increases the complexity of the deoxidation process. By introducing a certain amount of H into the raw gas of coal bed methane 2 , H 2 and O in coalbed methane 2 The reaction begins on the catalyst, and the combustion exotherm preheats t...

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Abstract

The invention relates to a catalytic deoxidation process of oxygen-contained coal bed gas. The oxygen-contained coal bed gas and coal bed gas product gas returned with a certain recycle ratio are mixed to go to a fixed bed adiabatic catalytic reactor, methane in the coal bed gas is reacted with oxygen to generate carbon dioxide and water, thereby the concentration of the oxygen in the coal bed gas product gas is reduced to be lower than 0.2 percent. The invention can effectively remove the oxygen in the oxygen-contained coal bed gas with the concentration of the oxygen of 1-15 percent, the recovery ratio of the methane is similar to theoretical recovery ratio obtained by calculation according to complete conversion of the methane and the oxygen, and security risk which exists in subsequent coal bed gas separation (liquification, pressure varying adsorption, barrier separation, and the like) technical process can be completely eliminated due to the low-concentration oxygen in the product gas.

Description

technical field [0001] The invention belongs to the field of chemistry, in particular to an oxygen-containing (O 2 ) CBM catalytic deoxidation process. Background technique [0002] Coalbed methane is a combustible gas adsorbed in coal seams, and its main component is high-purity methane (CH 4 ). The existence of coalbed methane has brought great potential safety hazards to the safe production of coal mines. Therefore, it must be extracted or diluted before or during the coal mining process. Since coalbed methane usually does not contain sulfur, and does not contain carcinogenic toxic substances such as benzene, mercury, and lead, coalbed methane can replace conventional natural gas as a high-calorific value, pollution-free high-quality clean energy, and can be used as fuel for power generation and industrial fuel , vehicle fuel, chemical raw materials and residential fuel. Currently, for CH 4 Coalbed methane with a content of more than 60% has a relatively mature utili...

Claims

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Application Information

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IPC IPC(8): C10K1/34B01J23/40
Inventor 王树东王胜苏宏久李德意
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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