煤矿安全2026，Vol.57Issue(1)：65-75,11.DOI:10.13347/j.cnki.mkaq.20241850
含柠檬酸的羧甲基纤维素钠溶液抑制煤自燃特性的实验研究
Experimental study on characteristics of sodium carboxymethyl cellulose solution containing citric acid to inhibit coal spontaneous combustion
摘要
Abstract
Coal spontaneous combustion is a major hidden danger in coal mine safety production,and the traditional coal spontan-eous combustion inhibition material has the problems of single principle,complex preparation process and high cost.In view of the existing problems,we use sodium carboxymethyl cellulose(CMC),citric acid and sodium secondary alkyl sulfonate(H95)as raw materials to prepare a new type of gel inhibitor material that can simultaneously play two roles of physical barrier and chemical in-hibition in the process of coal oxidation by reasonable ratio.The chemical structure of the new material before and after preparation was characterized by Fourier transform infrared spectroscopy.The inhibition performance of the new material was analyzed by test-ing its viscosity,wettability and water retention,and the inhibitory effect of the new material on coal oxidation was evaluated by tem-perature programmed experiments and thermogravimetric analysis experiments.The results showed that in the prepared new materi-als,CMC and citric acid produced chemical crosslinking and hydrogen bonding,which proved that the gel was successfully com-pounded with chemical inhibitors.When the mass fraction of CMC was 2%,the viscosity of the new material and pure CMC gel reached 1.12 Pa·s and 3.83 Pa·s,respectively.At this time,the solution state of the new material is most suitable for spraying;the maximum wetting heights of the new material,mass fraction 2%pure CMC gel and deionized water on pulverized coal were 12.5 mm,10.3 mm and 9.9 mm,respectively.The water loss rates of the three materials after vacuum drying for 10 h were 87.06%,82.71%and 97.61%,respectively.Compared with raw coal and citric acid treated coal,the cross point temperature of coal samples treated with new materials increased by 5.5 ℃and 2.1 ℃respectively.When the oxidation temperature reaches 180 ℃,the CO gas volume fraction,oxygen consumption rate and exothermic intensity are reduced by 50.57%,69.5%and 59.5%respectively com-pared with raw coal,and reduced by 33.1%,45.1%and 28.3%respectively compared with citric acid treated coal.The five oxidation characteristic temperature points of coal samples treated with new materials in thermogravimetric analysis experiment are signific-antly lower than those of raw coal and citric acid treated coal,and the spontaneous combustion tendency is weaker than that of the other two groups of coal samples.This study verifies the feasibility of new materials to inhibit coal spontaneous combustion,and puts forward the application of new materials to the underground atomization spraying process.关键词
煤自燃/凝胶阻化材料/阻化剂/羧甲基纤维素钠/柠檬酸/程序升温/热重分析Key words
coal spontaneous combustion/gel inhibitor material/inhibitor/sodium carboxymethyl cellulose/citric acid/pro-grammed temperature/thermogravimetry analysis分类
矿业与冶金引用本文复制引用
蔡峰,沈澳..含柠檬酸的羧甲基纤维素钠溶液抑制煤自燃特性的实验研究[J].煤矿安全,2026,57(1):65-75,11.基金项目
安徽省高校协同创新资助项目(GXXT-2020-057) （GXXT-2020-057）
