Intelligent and integrated techniques for coalbed methane (CBM) recovery and reduction of greenhouse gas emission

Hu, Qianting; Liang, Yunpei; Wang, Han; Zou, Quanle; Sun, Haitao

doi:10.1007/s11356-017-9335-4

Cited by 33 publications

(5 citation statements)

References 46 publications

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“…1 Gas in coal mines is also a green energy source, showing multiple advantages including efficiency and low-pollutant emitting. [2][3][4] China is rich in gas reserves, ranking second in the world; however, in the process of coal mining, the vast majority of gas cannot be effectively utilized. 5 Moreover, with the constant increase in mining depth, mining conditions become more complex and the hidden dangers during coal mining are significant.…”

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Numerical simulation of boreholes for gas extraction and effective range of gas extraction in soft coal seams

Pan

Huang

et al. 2019

Energy Science & Engineering

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Gas disasters are a major factor influencing safe production in mines: Gas extraction can reduce the gas content in coal seams, providing a guarantee of safer production. The parameters for gas extraction are the primary factors influencing the effectiveness thereof. Aiming at the creep properties of soft coal, a fluid‐solid coupling mathematical model considering creep properties of coal was established based on dynamic evolution equation for permeability considering the effects of matrix shrinkage and effective stress. Additionally, by utilizing COMSOL Multiphysics software, the gas extractions from a single borehole and multiple boreholes were calculated. Moreover, the parameters for gas extraction were optimized and applied and tested in field conditions. The result showed the reduction in gas pressure around the boreholes was larger than that from a single borehole when conducting gas extraction from multiple boreholes. The borehole spacing when extracting gas in coal seams by drilling multiple boreholes should be more than twice that of the effective drainage radius. The optimal borehole spacing ranged from 3.2 to 4.2 m for gas extraction lasting 180 d. Numerical simulation was carried out to ascertain the distribution of stress on coal around a roadway. The result revealed that the damage radius of the roadway was 11.8 m, and a reasonable hole‐sealing depth was 12 m. On condition that the borehole spacing during gas extraction from multiple boreholes was 4 m, the reasonable pre‐extraction time was 180 days taking the gas pressure being reduced to <0.74 MPa as a critical point. Furthermore, the gas content, the amount of extracted gas, etc, in a working face after the parameters for gas extraction were optimized were measured. The result suggested that the effect of gas extraction after optimizing parameters conformed to industry standards.

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Numerical simulation of boreholes for gas extraction and effective range of gas extraction in soft coal seams

Pan

Huang

et al. 2019

Energy Science & Engineering

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“…Coalbed methane (CBM) is an associated gas produced during coal mining, which is a kind of gas energy associated with coal, , but it is also a greenhouse gas (GHG) that causes environmental pollution. , In particular, large quantities of GHG are emitted during coal mining due to geomechanical instability. This will not only lead to the aggravation of the greenhouse effect but also lead to coal mine fires or gas explosions , and other dangerous accidents. , Therefore, how to effectively recover CBM resources and reduce GHG emissions is the focus and hotspot of current research. − …”

Section: Introductionmentioning

confidence: 99%

Dynamic Evolution of Gas Flow during Coalbed Methane Recovery to Reduce Greenhouse Gas Emission: A Case Study

et al. 2022

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Gas pre-extraction technology in a coal reservoir can not only reduce greenhouse gas (GHG) emissions but also effectively recover coalbed methane (CBM). In this work, we use a geomechanical-coupled gas flow (GCF) model to simulate and analyze the pre-extraction effect of a mining-disturbed coal seam. First, the simulation results of the GCF model are compared with field test data to verify the correctness and reliability of our model. Then, the evolution law of the stress field, permeability field, and gas flow field in the extraction process is analyzed through a case study. The results show that the first principal stress of coal in a mining area increases first and then decreases slowly and reaches the peak value at 5 m. The third principal stress increases gradually at first and becomes stable after 10 m. As the distance from the mining face increases, the permeability and gas pressure of the coal seam show continuous and asymmetric “U”-shaped and “n”-shaped distribution characteristics, respectively. In addition, the recovery effect and abnormal emission factors of CBM are discussed. This study can provide theoretical guidance for optimizing the CBM recovery effect and reducing GHG emissions during mining.

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“…It is deepening at the rate of 10-20 meters every year. The average mining depth in China is close to 700 meters [4][5]. With the continuous increase of mining depth, the stress of coal seams increases, the gas content and gas pressure of coal seams increase, the mining conditions of coal mines deteriorate, serious casualties and property loss accidents occur frequently, which seriously affect the safety of mine production and miners' lives [6].…”

Section: Introductionmentioning

confidence: 99%

Design of gas drainage system based on PLC redundancy control technology

Wang

2022

Preprint

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In order to improve the stability and reliability of the gas drainage monitoring system, reduce and eliminate the hidden danger of gas overrun safety accidents caused by the monitoring system failure. We designed a gas drainage monitoring system based on redundant control technology. First of all, we designed the overall architecture of the monitoring system. Siemens S7-1500R series programmable logic controller (PLC) was used as the core control unit, redundant design was carried out for CPU and DC24V power supply, and the PLC control cabinet was designed according to the on-site requirements. In the design, smart sensors and digital signal transmission are used to improve the anti-interference ability of the system. Secondly, we designed RS485 communication program and PID control program in portal software to realize data acquisition of smart sensors and constant pressure control of gas drainage system. Finally, we use WinCC configuration software to design the human-machine interface (HMI), which realizes the online monitoring and remote control of the gas drainage system. The application shows that the switching time from the primary CPU to the backup CPU automatically due to failure is about 300 ms. In addition, when any CPU, profinet cable or power supply fails, the system can still work normally, effectively improving the stability and reliability of the gas drainage monitoring system, and achieving the goal of monitoring the gas drainage system efficiently.

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Intelligent and integrated techniques for coalbed methane (CBM) recovery and reduction of greenhouse gas emission

Cited by 33 publications

References 46 publications

Numerical simulation of boreholes for gas extraction and effective range of gas extraction in soft coal seams

Numerical simulation of boreholes for gas extraction and effective range of gas extraction in soft coal seams

Dynamic Evolution of Gas Flow during Coalbed Methane Recovery to Reduce Greenhouse Gas Emission: A Case Study

Design of gas drainage system based on PLC redundancy control technology

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