Development and application of modified lye for treating hydrogen sulphide in coal mine

Zhang, Chao; Wang, Xinglong; Liao, Hua; Liu, Chao; Li, Shugang; Xue, Jianyang; Zeng, Xiangzhen

doi:10.1016/j.fuel.2020.117233

Cited by 12 publications

(9 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure shows the mechanism of the pore structure evolution of coal after ScCO 2 saturation at different temperatures. The model is divided into three stages: (a) untreated; (b) ScCO 2 treatment at low temperatures; and (c) ScCO 2 treatment at high temperatures. In the untreated stage, the pore structure of coal is filled with soluble minerals and hydrocarbons, , which reduce the pore size and thus limit the migration of gases, as shown in Figure a. At the stage of ScCO 2 treatment at low temperatures, although ScCO 2 can dissolve minerals and extract low-molecular-weight compounds in coal pores (these dissolved minerals and hydrocarbons increase the pore volume of coal samples), the swelling of the coal matrix adsorbed by ScCO 2 leads to pore shrinkage and pore volume reduction. At this stage, the swelling effect of the coal matrix is stronger than the dissolution and extraction effects, leading to a decrease in the micropore volume (the reasons for which have been analyzed in Section ).…”

Section: Discussionmentioning

confidence: 99%

“…In the untreated stage, the pore structure of coal is filled with soluble minerals and hydrocarbons, , which reduce the pore size and thus limit the migration of gases, as shown in Figure a.…”

Section: Discussionmentioning

confidence: 99%

“…The temperature increases from 30 to 90 °C, and the pore volume of anthracite with a pore size greater than 100 nm increases from 0.0356 to 0.0418 mL/g, with an increase rate of 17.42%. Under the comprehensive influence of ScCO 2 and temperatures, according to the NMR results, the porosity of anthracite increased after (a) In the untreated stage, the pore structure of coal is filled with soluble minerals and hydrocarbons, 53,54 which reduce the pore size and thus limit the migration of gases, as shown in Figure 11a. (b) At the stage of ScCO 2 treatment at low temperatures, although ScCO 2 can dissolve minerals and extract lowmolecular-weight compounds in coal pores (these dissolved minerals and hydrocarbons increase the pore volume of coal samples), the swelling of the coal matrix adsorbed by ScCO 2 leads to pore shrinkage and pore volume reduction.…”

Section: Evolution Mechanisms Of Pore Structures Subjected To Scco 2 ...mentioning

confidence: 99%

See 2 more Smart Citations

Effects of Supercritical Carbon Dioxide Saturation Temperature on the Multiscale Pore Structure of Coal

He,

Chen,

Lian

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

The influence of supercritical carbon dioxide (ScCO 2 ) on the pore structure of coal at different temperatures, especially the evolution of multiscale pore structure (from nanometer scale to millimeter scale), is crucial for CO 2 sequestration in deep coal seams. Thus, multiscale measurement techniques, including proximate analysis, CO 2 adsorption, mercury intrusion porosimetry (MIP), low-field nuclear magnetic resonance (NMR), and X-ray CT scanning, were combined to investigate the pore structure evolution of anthracite after ScCO 2 saturation at different temperatures. Findings unveiled a progressive reduction in the moisture, ash, and volatile matter content of anthracite as the ScCO 2 saturation temperature increased from 40 to 100 °C. The porosity of anthracite increased by 10.48−14.4% under ScCO 2 saturation across different temperatures, and it increased gradually with the increase of temperature. The increase in anthracite porosity caused by ScCO 2 saturation at temperatures increasing from 40 to 100 °C is less than that before and after ScCO 2 saturation at 40 °C. The proportion of micropores and mesopores decreased, while the proportion of macropores increased. A CT scan showed that, due to the coupling effect of temperature and ScCO 2 , the temperature increase accelerated the porosity growth of anthracite before and after ScCO 2 saturation. After saturation of ScCO 2 , adsorption pores (<50 nm) did not exhibit fractal characteristics, while seepage pores (>50 nm) exhibited a favorable fractal characteristic. As the temperature increased, the fractal dimension of the seepage pores decreased, indicating that the pore roughness and complexity of the seepage pores decreased with the ScCO 2 temperature. Finally, a conceptual model was proposed to elucidate the mechanism of the pore structure evolution of anthracite under ScCO 2 saturation at different temperatures. This study is of great significance for understanding the temperature effect on coal reservoir porosity evolution during CO 2 storage in deep coal seams.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Evolution Mechanisms Of Pore Structures Subjected To Scco 2 ...mentioning

confidence: 99%

See 1 more Smart Citation

Effects of Supercritical Carbon Dioxide Saturation Temperature on the Multiscale Pore Structure of Coal

He,

Chen,

Lian

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…硫化氢(H 2 S)作为一种剧毒、易燃、易腐蚀的酸性气体，在化工生产、生物医学和能源电力等多个领域中都是重要的中间产物或排放物质 [1,2] ，其浓度过高不仅会给设备造成严重的腐蚀作用，而且 H 2 S 泄露或逃逸会对生态环境和人体健康造成严重的危害 [3][4][5] [6] ；而电化学 H 2 S 传感器 [7] [13][14][15][16] 。如 H 2 S 与空气的碰撞展宽系数具有随低能级转动量子数(J'' +0.2Ka'' )增加而缓慢下降的规律，该参数主要基于少数实验数据的线性拟合得到 [17,18] ，相关参数的准确性有待进一步验证。数据库中的参考值与实际测量结果偏差会导致气体参数测量结果存在较大的不确定度。此外，HITRAN 数据库采用的 VP 函数精度较低，随着近年来气体参数测量精度要求的提高，比 VP 更符合实际线型轮廓的线型函数模型得到越来越多的关注。目前 Raution 线型(Raution profile， RP)和二次速度依赖的 Voigt 线型( quadratic Speed-dependent Voigt Profile， qSDVP) [19][20][21]…”

Section: 引言unclassified

High precision measurement of spectroscopic parameters of H2S in 6320—6350 cm–1 band

Si-Di¹,

Du²,

Li³

et al. 2023

Acta Phys. Sin.

View full text Add to dashboard Cite

As a highly corrosive and highly toxic gas, hydrogen sulfide (H2S) is an important intermediate product or pollutant in many fields such as chemical industry, energy and environment. Accurate online measurement of its concentration is of great significance for process control and production safety. Tunable diode laser absorption spectroscopy (TDLAS), as a quantitative absorption spectroscopy technique, is suitable for high-precision on-line measurement of H2S concentration in atmospheric environment and industrial processes. Considering that most of the spectroscopic parameters of H2S in the HITRAN2020 database are mainly calculated based on semi-empirical theoretical model and lack of experimental data verification, in this paper, direct absorption spectroscopy (DAS) method was firstly used to measure the absorption spectra of H2S in the band of 6320~6350 cm-1. Six groups of characteristic lines with strong absorption and relative independence were selected as the target transitions for experimental measurement. Then, the wavelength modulation-direct absorption (WM-DAS) method with no calibration and high signal-to-noise ratio was used to measure the absorbances of the six groups of transitions under different pressures. Voigt, Raution and quadratic speed-dependent Voigt profiles were least squares fit to the measured absorbances in order to obtaining the spectroscopic parameters such as the collision broadening coefficient, line strength and Dicke narrowing coefficient, and the minimum standard deviation of residual error of absorbances was 7×10-5. The measurement uncertainty of line strengths were less than 2%, and the uncertainty of collision broadening coefficients, Dicke narrowing coefficients and the speed-dependent coefficients were less than 10%. This work is helpful to improve the H2S spectral database and provide the spectral data basis for the high-precision measurement of H2S concentration.

show abstract

“…The adsorbed-state H 2 S in coal seams could be easily disturbed and spread into the air. The recommended measures for controlling the adsorbed-state H 2 S in the coal seams were reduced to drilling the coal seam surface for advanced detection of H 2 S before mining, followed by the injection of alkaline liquid in the H 2 S anomaly regions of the coal seam for the neutralization of H 2 S. Moreover, to enhance the treatment performance, the corresponding alkaline injection amount could be assessed by the distribution characteristics of H 2 S content in the coal seams (Zhang et al, 2020). Given the neutralization capability, treatment efficiency, cost, and equipment structure, NaHCO 3 was a lucrative alkali-injection solute.…”

Section: H 2 S In the Adsorbed Statementioning

confidence: 99%

Hydrogen sulfide occurrence states in China's coal seams

Yang

Wang

et al. 2021

Energy Exploration & Exploitation

View full text Add to dashboard Cite

The occurrence states of hydrogen sulfide in coal seams are crucial in preventing and controlling hydrogen sulfide emission in coal mines and the safe development of coal bed methane. In this study, the research status of the occurrence states of free-state, adsorbed-state, and water-soluble hydrogen sulfide in coal seams was systematically analyzed. H2S anomaly areas in China's coal seams are mainly located in the Carboniferous-Permian and Jurassic series of northern, eastern, central, and northwest regions of China. Bacterial sulfate reduction accounts for most of the hydrogen sulfide anomalies of low-rank coal, while thermochemical decomposition thermal desorption spectroscopy and thermochemical sulfate reduction may also result in hydrogen sulfide anomaly in medium- and high-rank coal. In contrast, magmatism-induced hydrogen sulfide anomalies are rarely found. Absorbed-state hydrogen sulfide anomalies are prevailing, while water-soluble and free-state hydrogen sulfide anomalies are relatively scarce. Coal seam's porosity mainly controls the hydrogen sulfide adsorption, pressure, coalification degree, pore volume, and specific area, while water-soluble hydrogen sulfide is influenced by pressure, sulfate-reducing bacteria, burn, porosity, fractures, water temperature, and hydrodynamic conditions. The fractures in coal seams, their burial depth, coal quality, coal rank, roof, and floor lithology are the main factors controlling the free-state hydrogen sulfide preservation. The absorbed-state hydrogen sulfide in coal seams is mainly mitigated by varying the ventilation mode, increasing the ventilation capacity, spraying alkali fog into the air, and injecting alkali liquid into coal seams for governance.

show abstract

Development and application of modified lye for treating hydrogen sulphide in coal mine

Cited by 12 publications

References 25 publications

Effects of Supercritical Carbon Dioxide Saturation Temperature on the Multiscale Pore Structure of Coal

Effects of Supercritical Carbon Dioxide Saturation Temperature on the Multiscale Pore Structure of Coal

High precision measurement of spectroscopic parameters of H<sub>2</sub>S in 6320—6350 cm<sup>–1</sup> band

Hydrogen sulfide occurrence states in China's coal seams

Contact Info

Product

Resources

About