東榮礦區(qū)煤樣氧化反應(yīng)動(dòng)力學(xué)熱分析
2020-06-16 02:41趙維國(guó)李經(jīng)文張辛亥盧苗苗林清松張家亮
趙維國(guó) 李經(jīng)文 張辛亥 盧苗苗 林清松 張家亮
摘?要：東榮礦區(qū)煤層自燃現(xiàn)象較為嚴(yán)重，煤的氧化動(dòng)力學(xué)參數(shù)是反映煤自燃傾向性的重要指標(biāo)，為防治東榮礦區(qū)煤層自燃，在不同升溫速率條件下的基礎(chǔ)上，應(yīng)用熱重分析實(shí)驗(yàn)，研究了東榮煤樣升溫氧化過(guò)程中質(zhì)量變化的規(guī)律，同時(shí)結(jié)合15種氣固反應(yīng)機(jī)理函數(shù)，運(yùn)用atava法對(duì)煤樣進(jìn)行動(dòng)力學(xué)分析，確定了煤氧化機(jī)理函數(shù)，及活化能、指前因子及反應(yīng)級(jí)數(shù)等動(dòng)力學(xué)參數(shù)，并應(yīng)用Ozawa法對(duì)得到的動(dòng)力學(xué)參數(shù)結(jié)果進(jìn)行了驗(yàn)證。實(shí)驗(yàn)表明：不同升溫速率下煤樣氧化自燃總反應(yīng)歷程相似，熱分析曲線的變化規(guī)律相同，但隨著升溫速度的加大，曲線有向右平移的趨勢(shì)。計(jì)算得到煤樣高溫劇烈氧化時(shí)的反應(yīng)級(jí)數(shù)為1級(jí)，反應(yīng)動(dòng)力學(xué)模式為一級(jí)化學(xué)反應(yīng)，其表觀活化能為174.588 kJ/mol，指前因子為5.729×1010.
關(guān)鍵詞：熱重實(shí)驗(yàn);特征溫度;熱分析動(dòng)力學(xué);活化能
中圖分類(lèi)號(hào)：TD 752.2
文獻(xiàn)標(biāo)志碼：A
文章編號(hào)：1672-9315（2020）02-0238-06
DOI：10.13800/j.cnki.xakjdxxb.2020.0207開(kāi)放科學(xué)（資源服務(wù)）標(biāo)識(shí)碼（OSID）：
Kinetics and thermal analysis of oxidation reaction of
coal samples in Dongrong mining area
ZHAO Wei-guo1，LI Jing-wen2，3，ZHANG Xin-hai2，3，
LU Miao-miao2，3，LIN Qing-song4，ZHANG Jia-liang4
（1.Institute of Mining，Liaoning Technology University，F(xiàn)uxin123000，China;
2.Key Laboratory of Western Mine Exploitation and Hazard Prevention，Ministry of Education，
Xian University of Science and Technology，Xian 710054，China;
3.College of Safety Science and Engineering，Xian University of Science and Technology，Xian710054，China;
4.Inner Mongolia Yitai Coal Co.，Ltd.，Ordos 017000，China）
Abstract：The spontaneous combustion of coal seam in Dongrong mining area is quite serious，and oxidation kinetics parameters of coal are important indicators to the tendency of spontaneous combustion of coal.In order to prevent and control spontaneous combustion of coal seam in Dongrong mining area，the law of mass change in the process of heating and oxidating of Dongrong coal sample was studied by thermogravimetric analysis experiment under different heating rate conditions.
And with 15 kinds of gas-solid reaction mechanism functions and atava in mind，the kinetic analysis of coal samples was carried out，and the mechanism function of coal oxidation and the kinetic parameters such as activation energy，pre-exponential factor and reaction series were determined.The results of the kinetic parameters obtained were verified by Ozawa method.The experimental results indicate that the total reaction process of coal sample oxidation spontaneous combustion is similar under different heating rates，and the change rule of thermal analysis curve is the same，but with the increase of heating rate，the curve has the trend of moving to the right.It is calculated that the reaction order of coal sample is first order and the reaction kinetics model is first order chemical reaction.The apparent activation energy is 174.588 kJ/mol，and the pre-exponential factor is 5.729×1010.
