油页岩干馏残渣与含油污泥混烧特性

采用热重红外联用技术对油页岩干馏过程中产生的两种固体废弃物油页岩干馏残渣和含油污泥进行混烧实验,通过分析燃烧特性曲线、燃烧特性参数、混烧协同作用、样品中各组分的燃烧特性、混烧动力学参数及气体产物的析出特性,对两种固体废弃物的混烧特性进行了研究。结果表明,油页岩干馏残渣和含油污泥的混烧过程可分为三个阶段。含油污泥的掺入改善了干馏残渣的燃烧状况。干馏残渣与含油污泥的混烧协同作用主要发生在第一阶段和第二阶段。干馏残渣和含油污泥在不同燃烧条件下会出现相互促进或相互抑制的现象。高斯分峰拟合结果表明,混烧过程可分为五个燃烧子反应。基于高斯分峰拟合的Coats-Redfern法计算结果表明,各样品以及各样品中各组分的活化能均不同。含油污泥比例的变化对5个燃烧子反应的影响不同。Friedman法计算结果表明,三个混烧阶段的活化能分别处于50～150、150～200、250～350 k J/mol内。含油污泥促进了干馏残渣的前期和中期的燃烧,但没有改善其后期的燃烧。红外技术分析结果表明,各样品的气体析出规律一致。CO与CO_2排放量的相对值与含油污泥比例不成正比,表明高含油污泥比例不利于充分燃烧。

Study on co-combustion characteristics of oil shale retorting residue and sludge

Experiments in co-combustion of oil shale retorting residue and oily sludge, two kinds of solid waste produced in retorting process of oil shale, were conducted on TG-FTIR. In order to study co-combustion characteristics of oil shale retorting residue and oily sludge, co-combustion curves and characteristic parameters, synergy, combustion characteristics of each component in different samples, kinetics and gas releasing characteristics were analyzed. The results show that co-combustion process of oil shale retorting residue and oily sludge contains three stages. Oily sludge can improve combustion characteristics of retorting residue. Synergistic effect of retorting residue and oily sludge in the mixed burning process mainly occurs in the first and second stages. At different combustion conditions, oil shale retorting residue and oily sludge will promote or restrain each other. The results of gaussian multipeaks fitting show that the mixed burning process of oil shale retorting residue and oily sludge contains five combustion sub-reactions. The results of C-R method based on gaussian multipeaks fitting show that reaction series and apparent activation energy of each component in different samples are different. The effect of vary of oily sludge ratio on five combustion sub-reactions are different. The results of Friedman method show that activation energy of three co-combustion stages are respectively at the range of 50~150kJ/mol, 150~200kJ/mol and 250~350kJ/mol. And, oily sludge promotes the combustion of retorting residue in the first and second stages, but not in the third stage. The results of FTIR analysis showed that gas releasing laws of different samples are consistent. SCO/SCO2 is not proportional to the ratio of oily sludge, indicating that high ratio of oily sludge is not conducive to sufficient combustion.