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Mathematical modelling of slow pyrolysis of segregated solid wastes in a packed-bed pyrolyser

机译：在填充床热解器中缓慢热解分离的固体废物的数学模型

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Waste segregation is being explored as one of the potential effective ways for waste management, where wastes are separated for either recycling or energy recovery. In this paper, three segregated wastes, contaminated waste wood, cardboard and waste textile are pyrolysed in a slow-heating packed-bed reactor for the purpose of solid, liquid and gas recovery. The effect of final temperature was investigated and product yields and compositions were measured. Mathematical modelling was employed to simulate the heat, mass transfer and kinetic processes inside the reactor. Both a parallel reaction model and a function group model were used to predict the product yields as well as their compositions. Char yield of 21-34 percent, tar 34-46 percent and gas 23-43 percent were obtained. It is found that packed-bed pyrolysis produces 30-100 percent more char compared to standard TGA tests and the local heating rate across the packed-bed reactor differs remarkably from the programmed wall-heating rate and varies greatly in both time and space. Mathematical modelling suggests that wood has higher tar cracking ability than cardboard and textile wastes during pyrolysis, and the effects of mineral contents in the fuel need to be explored. CO_2, CO, tar and water are the main released species during the major stage of the pyrolysis processes which occurs between 250 and 450 deg C, whereas noticeable quantity of hydrogen and light hydrocarbons is observed only at higher temperature levels and at the final stage.
机译：废物隔离正在探索为废物管理的潜在有效方法之一，将废物分开进行回收或能源回收。在本文中，将三种分离的废物，受污染的废木料，纸板和废纺织品在一个缓慢加热的填充床反应器中进行热解，以回收固体，液体和气体。研究了最终温度的影响，并测量了产品的收率和组成。使用数学模型来模拟反应器内的热，传质和动力学过程。平行反应模型和功能组模型均用于预测产物收率及其组成。获得21-34％的焦炭产率，焦油34-46％的焦油产率和23-43％的气体。已经发现，与标准的TGA测试相比，填充床热解产生的焦炭多出30％至100％，并且填充床反应器中的局部加热速率与程序设定的壁加热速率显着不同，并且在时间和空间上都有很大差异。数学模型表明，在热解过程中，木材比纸板和纺织品废料具有更高的焦油开裂能力，需要探索燃料中矿物质含量的影响。 CO_2，CO，焦油和水是热解过程主要阶段（250至450摄氏度之间）中释放的主要物质，而只有在较高温度水平和最后阶段才能观察到明显量的氢和轻烃。

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