改性固废基多孔颗粒吸附CO_(2)及其解吸抑制煤自燃特性研究

Study on the adsorption of CO_(2)by modified solid waste-based porous particles and its desorption to inhibit spontaneous combustion of coal

煤矿采空区遗煤自燃灾害频发,严重危害矿井安全生产。为了防治采空区遗煤自燃,本文研究了一种胺改性固废多孔材料,并研究了胺改性固废多孔材料的CO_(2)吸附性能及抑制煤自燃特性。研究结果表明,有机胺改性剂能够成功负载在固废多孔颗粒上,并且在不同有机胺(乙醇胺(MEA)、二乙烯三胺(DETA)、四乙烯五胺(TEPA)、聚乙烯亚胺(PEI))改性多孔颗粒中,四乙烯五胺(TEPA)改性多孔颗粒CO_(2)吸附性能最好。CO_(2)吸附实验结果表明,随着改性剂负载量的增大,CO_(2)吸附量先升高后降低,25℃、1bar条件下,有机胺负载量为20wt%时,吸附量最大达到119.24mg/g;改性剂负载量相同时,CO_(2)吸附量随着温度的升高先增加后降低,70℃时吸附量最高,为128.97 mg/g。程序升温测试结果显示,相较于添加未吸附CO_(2)的改性颗粒,添加吸附CO_(2)的改性颗粒后,煤样的交叉点温度升高了29.2℃,有效降低了煤自燃危险性,温度升高过程中改性颗粒吸附的CO_(2)能够解吸,降低煤颗粒周围的氧浓度,从而抑制采空区遗煤自燃。本文研究对促进工业固废的高效利用、推动采空区煤自燃灾害高效防控技术的发展具有重要意义。

Spontaneous combustion of coal remains in coal mining goaf is a frequent disaster,which seriously endangers the safety production of mines.In order to prevent the spontaneous combustion of coal remains in the goaf,an amine-modified solid waste porous material is investigated in this paper,and the carbon dioxide adsorption performance and the spontaneous combustion inhibition characteristics of the amine-modified solid waste porous material are studied.The results show that the organic amine modifier can be successfully loaded on the solid waste porous particles,and among the different organic amine(ethanolamine(MEA),diethylene triamine(DETA),tetraethylenepentamine(TEPA),and polyethyleneimine(PEI))modified porous particles,the carbon dioxide adsorption property of the porous particles modified with tetraethylenepentamine(TEPA)is best.The results of CO_(2)adsorption experiments show that the porous particles have the best performance.The results of CO_(2)adsorption experiments show that the CO_(2)adsorption amount first increases and then decreases with the increase of modifier loading,and the maximum adsorption amount reaches 119.24 mg/g at 25℃and 1 bar with 20 wt%of organic amine loading;the CO_(2)adsorption amount increases and then decreases with the increase of temperature at the same modifier loading,and the maximum adsorption amount reaches 128.97 mg/g at 70℃.The results of the programmed temperature rise test show that compared with the addition of modified particles without adsorbed CO_(2),the addition of modified particles with adsorbed CO_(2)increases the cross-point temperature of the coal samples by 29.2℃,which effectively reduces the risk of spontaneous combustion of coal,and the CO_(2)adsorbed by the modified particles in the process of temperature rise is able to desorb and reduce the oxygen concentration around the coal particles,which inhibites spontaneous combustion of the coal remains in the goaf.This study is of great significance to promote the efficient use of industrial solid waste and the development of efficient prevention and control technology for the spontaneous combustion hazard of coal in the goaf.