Method and device for safely utilizing coal bed gas

A coalbed methane and safe technology, applied in combustion methods, combustion types, incinerators, etc., can solve the problems of difficult to guarantee catalyst stability, low heat recovery efficiency, low reaction temperature, etc. The effect of large, system pressure reduction

Active Publication Date: 2019-05-17
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] This method can make the coalbed methane undergo a catalytic oxidation reaction below 350 ° C, and the treatment efficiency is high. However, the use of noble metals in the catalyst is relatively expensive, and the stability of the catalyst is difficult to guarantee. In addition, due to the low reaction temperature, the recovery of heat less efficient

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  • Method and device for safely utilizing coal bed gas

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Effect test

Embodiment 1

[0056] Put into 1000kg catalyst CuO in the fluidized bed reactor 6 0.10 (MnO 2 ) 0.10 (TiO 2 ) 0.10 (γ-Al 2 o 3 ) 0.70 , the particle size of the catalyst is 30-200μm, turn on the induced draft fan 2, and pass 700m into the device 3 Air, catalyst reaction volume space velocity is controlled at 700h -1 , turn on the heater 5, control the inlet temperature of the fluidized bed reactor 6 at 450°C, preheat the catalyst and the fluidized bed; turn off the heater 5, turn off the induced draft fan 2, and feed methane into the gas mixer 1 The volume fraction of coalbed methane is 1.5%, and the amount of coalbed methane added is 500Nm 3 , use the temperature controller 9 to control the export volume of hot gas entering the low-temperature heat exchanger 4 from the fluidized bed reactor 6, and preheat the coalbed gas to 425°C in the low-temperature heat exchanger 4; then gradually feed the coalbed gas into the fluidized bed In the reactor 6, the reaction pressure is 10kPa, and...

Embodiment 2

[0058] Put into 2000kg catalyst CuO in the fluidized bed reactor 6 0.10 (Fe 2 o 3 ) 0.10 (MnO 2 ) 0.10 (TiO 2 ) 0.10 (SiO 2 ) 0.60 , the particle size of the catalyst is 30-250μm, turn on the induced draft fan 2, and pass 1000m into the device 3 Air, catalyst reaction volume space velocity is controlled at 500h -1 , turn on the heater 5 to control the inlet temperature of the fluidized bed reactor 6 at 400°C. The coalbed methane with a methane volume fraction of 2.8% is introduced into the medium, and the amount of coalbed methane added is 1000Nm 3 , the reaction pressure is 15kPa, the methane catalytic combustion reaction occurs between the coalbed gas and the catalyst in the bubbling fluidized bed, and the reaction temperature rises rapidly to 620-650°C; The amount of gas and demineralized water, when the coalbed gas is 8000Nm 3 Finally, the softened water flow rate is 20t / h, and the catalytic combustion reaction space velocity reaches 4000h -1 , to achieve ste...

Embodiment 3

[0060] Put into 5000kg catalyst CuO in the fluidized bed reactor 6 0.10 (Fe 2 o 3 ) 0.15 (MnO 2 ) 0.20 (TiO 2 ) 0.10 (γ-Al 2 o 3 ) 0.55 , the particle size of the catalyst is 50-250μm, turn on the induced draft fan 2, and pass 4000m into the device 3 Air, catalyst reaction volume space velocity is controlled at 800h -1, open heater 5, make the inlet temperature of fluidized bed reactor 6 be controlled at 350 ℃, catalyst and fluidized bed are preheated; Close heater 5, feed methane volume fraction in gas mixer 1 and be 10% coalbed methane, the amount of coalbed methane added is 1000m 3 , the air in the induced draft fan 2 is passed into the gas mixer 1, and the amount of air introduced is 2000m 3 , through the concentration controller 8, the volume fraction of methane in the coalbed gas is controlled at 3.3%; the mixed coalbed gas is passed through the low-temperature heat exchanger 4, and then passed into the fluidized bed reactor 6, and the reaction pressure is 2...

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Abstract

The invention provides a method and a device for safely utilizing coal bed gas, and belongs to the technical field of coal bed gas treatment. The method for safely utilizing the coal bed gas comprisesthe following steps that when the volume fraction of methane in the coal bed gas is 1.5-2%, and after being heated, the coal bed gas is mixed with preheated catalyst to carry out catalytic combustionreaction; when the volume fraction of the methane in the coal bed gas is 2-4%, the coal bed gas is mixed with the preheated catalyst to carry out catalytic combustion reaction; and when the volume fraction of the methane in the coal bed gas is 4-15%, after being diluted, the coal bed gas is mixed with the preheated catalyst to carry out catalytic combustion reaction. By adoption of the treatmentmethod, safe treatment of the coal bed gas with the volume fraction of the methane being 1.5-15% can be realized; and operation is simple and convenient, energy consumption is low, and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of coal bed gas utilization, in particular to a method and device for safely utilizing coal bed gas. Background technique [0002] my country is a big coal consumption country, and a large amount of coalbed methane and exhaust gas will be produced in the process of coal mining, the main components of which are methane and air. According to different mining methods, coalbed methane can be divided into two types: coalbed methane (CBM) extracted by surface drilling and coalbed methane (CMM) extracted from underground coal mines. The coalbed methane produced by surface drilling is the coalbed methane produced by surface wells before coal mining. It is characterized by CH 4 The content is high, generally the volume fraction is more than 90%, and the mining scale is large and the output is stable. After the coalbed methane is extracted and dehydrated, it can be directly input into the natural gas pipeline and ble...

Claims

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Application Information

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IPC IPC(8): F23G7/07F23G5/46
Inventor 吴志伟樊卫斌肖亚宁孙守靖王东飞赵建涛李俊汾焦卫勇朱华青秦张峰王建国
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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