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Catalytic conversion deoxidation method of coal-bed gas

A catalytic conversion and coal bed gas technology, applied in the field of deoxidation, can solve the problems of low cooling efficiency, lower energy utilization rate, and difficulty in using by-product steam, and achieve the effect of increasing heat and improving cooling efficiency

Inactive Publication Date: 2008-08-27
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the cooling efficiency of the gas output by this method (cooling efficiency η = output gas volume × output gas high calorific value / (input gas volume x input gas high calorific value)) is relatively low
In particular, the higher the oxygen content of CBM, the lower the cooling efficiency
If the by-product steam is difficult to utilize, its energy utilization rate will be significantly reduced

Method used

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  • Catalytic conversion deoxidation method of coal-bed gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The technical process of the coal bed gas catalytic conversion deoxidation method in this embodiment is as follows figure 1 Shown:

[0024] After desulfurizing raw coalbed methane 100NM3, add a small amount of water vapor to make H 2 O / CH 4 (molar ratio, the same below)=0.3, pass in the deoxidation reactor, in SiO 2 In the presence of a Ni-based catalyst as a carrier, a catalytic conversion deoxygenation reaction is carried out;

[0025] The pressure of the deoxidation reaction is 0.60MPa, and the inlet temperature of the deoxidation reactor is 400°C.

[0026] The composition (vol%) of raw coal bed gas is: CH 4 50%, O 2 10%, N 2 40%.

[0027] The gas outlet temperature after the reaction was 650°C.

[0028] The dry gas composition (vol%) after the reaction is: CH 4 25.73%, N 2 31.30%, H 2 29.57%, CO 8.37%, CO 2 5.03%.

[0029] The gas volume after reaction is 127.8Nm 3 , the calorific value of the mixed gas (higher calorific value, the same below) 1...

Embodiment 2

[0033] The technical process of the coal bed gas catalytic conversion deoxidation method in this embodiment is as follows figure 1 Shown:

[0034] After desulfurizing raw coalbed methane 100NM3, add a small amount of water vapor to make H 2 O / CH 4 (molar ratio, the same below)=0.2, pass in the deoxidation reactor, in Al 2 o 3 In the presence of a Ni-based catalyst as a carrier, a catalytic conversion deoxygenation reaction is carried out;

[0035] The pressure of the deoxidation reaction is 0.45MPa, and the inlet temperature of the deoxidation reactor is 400°C.

[0036] The composition (vol%) of raw coal bed gas is: CH 4 40%, O 2 12%, N 2 48%.

[0037] The gas outlet temperature after the reaction was 693°C.

[0038] The dry gas composition (vol%) after the reaction is: CH 4 14.66%, N 2 36.70%, H 2 32.72%, CO 12.64%, CO 2 3.28%.

[0039] The gas volume after reaction is 130.9Nm 3 , the calorific value of the outlet gas is 11.60MJ / Nm 3 .

[0040] The coo...

Embodiment 3

[0043] The technical process of the coal bed gas catalytic conversion deoxidation method in this embodiment is as follows figure 1 Shown:

[0044] After desulfurizing raw coalbed methane 100NM3, add a small amount of water vapor to make H 2 O / CH 4 (molar ratio, the same below)=0.5, pass in the deoxidation reactor, in Al 2 o 3 In the presence of a Ni-based catalyst as a carrier, a catalytic conversion deoxygenation reaction is carried out;

[0045] The pressure of the deoxidation reaction is 0.6MPa, and the inlet temperature of the deoxidation reactor is 400°C.

[0046] The composition (vol%) of raw coal bed gas is: CH 4 50%, O 2 10%, N 2 40%.

[0047] The gas outlet temperature after the reaction was 632.6°C.

[0048] The dry gas composition (vol%) after the reaction is: CH 4 24.93%, N 2 30.47%, H 2 31.45%, CO 6.72%, CO 26.63%.

[0049] The gas volume after reaction is 131.3Nm 3 , the calorific value of the mixed gas (high calorific value, the same below) ...

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Abstract

The invention discloses a coal bed gas catalysis conversion deoxidation method, which comprises pumping raw material coal bed gas into a deoxidation reactor to do catalysis conversion deoxidation reaction after desulfurizing. The invention is characterized in that water vapour is added in coal bed gas after coal bed gas is desulfurized, and mole ratio of water which is added and firedamp in coal bed gas is led to be H2O / CH4=0.2-0.5. Partial firedamp is conversed to be CO and H2 through adding a little amount of water in coal bed gas, the method increases heat quantity of output gas and improves cold air efficiency of output gas, which is suitable for the fields which have wider heat value adaptation to gas and need to be pressured to higher pressure.

Description

technical field [0001] The invention belongs to the technical field of gas deoxygenation, in particular to a deoxidation method in the field of coal bed gas. Background technique [0002] Coalbed methane is the associated gas of coal mines, and the methane content in coalbed methane (CMM) in coal mining areas is as high as 40%, which can be used as fuel and chemical raw materials. [0003] Because coalbed methane contains oxygen, in addition to being directly used as fuel or power generation, oxygen must be removed for pressurized transportation or concentration, so as to ensure the safe operation of subsequent processes. The Chinese patent with the notification number CN 1330739 C discloses a "catalytic combustion deoxidation process method for coal mine gas used in the production of methanol", which mainly uses methane and oxygen to remove oxygen by catalytic combustion, and the catalyst is a noble metal catalyst or perovskite type Composite metal oxide catalyst. [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/00C07C31/04C07C29/15
Inventor 陶鹏万李泽军吴且毅韩续良
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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