Coal bed gas coke deoxidization technique

A technology of coalbed methane and coke, which is applied in the field of deoxidation process, can solve the problems of increased degree of methane cracking, incomplete coke combustion, waste of resources, etc., and achieve the effect of reducing the possibility of explosion, reducing methane cracking, and improving safety

Pending Publication Date: 2007-02-28
SOUTHWEST RES & DESIGN INST OF CHEM IND
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Problems solved by technology

However, it is difficult to control the temperature during the reaction process of the coke combustion method. If the reaction temperature is too low, the deoxygenation of coalbed methane will not be complete, and the coke combustion will not be complete, which will increase the coke consumption and waste resources; if the reaction temperature is too high, The degree of methane cracking increases, which also causes waste of energy
And because the reaction between coke and oxygen, methane and oxygen in the deoxidation process are all strong exothermic reactions, and the coke deoxidation reactor is an adiabatic reactor, therefore, with the prolongation of the reaction time, the temperature in the reactor will also continue to increase. It is difficult to maintain the reaction temperature in the desired temperature range

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  • Coal bed gas coke deoxidization technique

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Effect test

Embodiment 1

[0023] The coalbed methane coke deoxidation process of this embodiment is as follows:

[0024] In a reactor with a diameter of 32mm, fill 200ml of metallurgical coke, under normal pressure, with 0.5M 3 The flow rate of / hr into the volume composition is O 2 10.5%, N 2 39.5%, CH 4 50% raw material coalbed methane, as the reaction continues, the reaction temperature can be raised to about 1008 ° C, the temperature is too high; through measurement, the composition of coalbed methane after deoxidation (volume percentage, dry basis) is: CH 4 42.98%, N 2 39.8%, O 2 0%, CO 2 5.10%, CO 6.52%, H 2 5.6%.

[0025] In this embodiment, there is no circulating part of the deoxidized and cooled CBM to the raw CBM before deoxidation, and the oxygen content in the raw CBM entering the deoxidation reactor is relatively high, which makes the temperature during the reaction higher than the ideal In the temperature range, the methane cracking loss is relatively large during the rea...

Embodiment 2

[0027] The coalbed methane coke deoxidation process of this embodiment is as follows:

[0028] In a reactor with a diameter of 32mm, fill 200ml of metallurgical coke, under normal pressure, with 0.5M 3 The flow rate of / hr is passed into the raw coalbed methane, and the oxygen content of the reaction gas entering the deoxygenation reactor is adjusted by circulating the partially deoxidized and cooled coalbed methane to the raw coalbed methane before deoxidation, so that the volume composition of each component in it is O 2 7.14%, N 2 26.86%, CH 4 66%, as the reaction continues, the reaction temperature can be controlled at about 780°C, which is an ideal reaction temperature; through measurement, the composition (volume percentage, dry basis) of coalbed methane after deoxidation is: CH 4 64.69%, N 2 26.86%, O 2 0%, CO 2 4.11%, CO 2.84%, H 2 1.5%.

Embodiment 3

[0030] The coalbed methane coke deoxidation process of this embodiment is as follows:

[0031] In a reactor with a diameter of 32mm, fill 200ml of metallurgical coke, under normal pressure, with 0.5M 3 The flow rate of / hr is passed into the raw coalbed methane, and the oxygen content of the reaction gas entering the deoxygenation reactor is adjusted by circulating the partially deoxidized and cooled coalbed methane to the raw coalbed methane before deoxidation, so that the volume composition of each component in it is O 2 6.3%, N 2 23.7%, CH 4 70%, as the reaction continues, the reaction temperature can be controlled at about 670°C, which is an ideal reaction temperature; through measurement, the composition (volume percentage, dry basis) of coalbed methane after deoxidation is: CH 4 68.25%, N 2 23.7%, O 2 0.46%, CO 2 5.08%, CO 1.93%, H 2 0.58%.

[0032] In Example 2 and Example 3, the oxygen content in the raw coal bed gas entering the deoxidation reactor is m...

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Abstract

The invention discloses the coal bed gas coke deoxidization technology, comprising the following steps: deoxidizing coal bed gas with coke and anthracite coal, keeping the temperature between 600-1000Deg.C, then dedusting, and cooling; adjusting the oxygen content in deoxidation reactor to 5-9%. The technology can keep reaction temperature, remove oxygen of coal bed gas, reduce methane cracking, and improve safety.

Description

technical field [0001] The invention relates to a deoxidation process before comprehensive utilization of coal bed gas. Background technique [0002] Coalbed methane is commonly known as "gas". Its main component is methane, which exists in large quantities in coal seams and belongs to unconventional natural gas. Coalbed methane is one of the main causes of underground accidents in coal mines. In fact, coalbed methane is a new energy source with high calorific value and no pollution. It can be used as fuel for power generation, industrial fuel, chemical raw material and residential fuel. If it is used reasonably, it can make up for the energy shortage; at the same time, the recovery and utilization of coalbed methane can also help protect the environment. Because coal bed methane leaks into the air along with coal mining, it will aggravate the global greenhouse effect. However, because the content of methane in coalbed methane is relatively low and the content of air is la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 胡善霖廖炯曾健陈耀壮
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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