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| High-pressure atomization dust reduction with amphoteric/anionic compound wetting agent |
Yong-bo YANG1,2( ),Peng-chao XING3,Ke LU1,2 |
1. China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing 400037, China
2. State Key Laboratory of the Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China
3. School of Safety Engineering, Chongqing University of Science and Technology, Chongqing 401331, China |
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Abstract To resolve the problem of high concentration dust pollution during the production of fully-mechanized coal mining face, based on the analysis of the dust reduction behavior of amphoteric/anionic compound wetting agent (AAC) and high-pressure atomization, the dodecyl dimethyl betaine (BS-12) and the sodium sec-alkyl sulfonate (SAS) were compounding studied by orthogonal experiment. The optimum wetting mass fraction of AAC was selected by dust settling experiment and solution surface tension test, the wetting ability of BS-12, SAS, and AAC was compared by immersion aspiration test. Combined with the on-site dust reduction practice, the dust reduction effect of mine water, BS-12, SAS and AAC with the same mass fraction was compared under the high-pressure atomization pressure of 8 MPa and the wind speed of 1.5 m/s in the fully-mechanized coal mining face. Results showed that the optimum mass fraction ratio of BS-12 and SAS was 0.30% ∶ 0.20%, when the mass fraction of AAC was 0.20%, the dust settling time and the solution surface tension tended to be the minimum value. At the early stage of soaking, the coal bodies in AAC, SAS, BS-12 solution and mine water were in a fast absorption state, the soaking time was 4 h, the absorption rate of coal bodies in AAC solution increased by 87.83%, 24.14%, and 16.76% compared with that in mine water, BS-12, and SAS solution respectively; at the later stage of soaking, the absorption rate of coal bodies in each solution were gradually stabilized. The dust concentration in fully-mechanized coal mining face increases and then decreases, and the highest point of dust concentration is located near 10 m on the downwind side of the shearer. After AAC high-pressure atomization dust reduction, the average dust reduction efficiency of total dust and respirable dust was 91.63% and 91.59% respectively, and the dust reduction effect of AAC high-pressure atomization was significantly higher than that of mine water, BS-12 and SAS.
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Received: 24 November 2022
Published: 16 October 2023
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| Fund: 国家重点研发计划项目(2017YFC0805202) |
两性/阴离子复配湿润剂高压雾化降尘
为了解决综采工作面生产期间高浓度粉尘污染问题，在分析两性/阴离子复配湿润剂（AAC）与高压雾化降尘行为的基础上，采用正交试验法对十二烷基二甲基甜菜碱（BS-12）、仲烷基磺酸钠（SAS）进行复配研究. 通过粉尘沉降实验、溶液表面张力测试优选AAC的最佳湿润质量分数，依托浸泡吸液实验对比BS-12、SAS、AAC的湿润能力. 结合现场降尘实践，在8 MPa的高压雾化压力下和1.5 m/s的综采工作面风速下，对比矿井水、相同质量分数的BS-12、SAS与AAC的降尘效果. 结果表明， BS-12和SAS的最佳质量分数比为0.30%∶0.20%，当AAC的质量分数为0.20%时，粉尘沉降时间和溶液表面张力均趋近于最小值. 在浸泡初期，AAC、SAS、BS-12溶液中的煤体和矿井水中的煤体均处于快速吸液状态，浸泡时间为4 h，AAC溶液中的煤体吸液率较矿井水、BS-12、SAS溶液中的分别增加了87.83%、24.14%、16.76%；在浸泡后期，各溶液中的煤体吸液率均逐渐稳定. 综采工作面粉尘浓度先增加后减少，粉尘浓度最高点在采煤机下风侧10 m附近. AAC高压雾化降尘后，总粉尘和呼吸性粉尘的平均降尘效率分别为91.63%和91.59%，降尘效果较矿井水、BS-12、SAS的有显著提升.
关键词：
湿润剂,
正交复配,
湿润能力,
高压雾化,
降尘效率
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