Behavior analysis for separation of heavy metalcompounds in exhaust gas in waste heat treatment process

为分析废热处理废气中重金属化合物的行为，研制了单直管式模拟装置。该模拟器能够模拟尾气中重金属和SO2、HCl等有毒气体的状态变化。通过控制温度和流量，对模拟器的排气状态进行了计算，并与实验结果进行了比较。为探讨工业废渣中重金属化合物分离技术的可行性，1)研制了由废热处理废气发生器和国控采样器组成的废热处理过程模拟器，对废热处理过程中重金属行为进行了实验研究。废气可处理高达1100min的废物，并向国家控制的采样器提供高达10L/℃的废气。对于不同温度下废气中的颗粒物和气体采样，国家控制的…MORE采样器具有三级石英滤芯，通过直管在800~200℃的温度范围内独立控制。考察了温度和停留时间对重金属行为的影响，考察了流速和石英滤芯位置对重金属行为的影响。通过热力学平衡模拟对含重金属废气的状态估计进行了模拟计算，模拟了通过状态控制采样器的排气状态。结果表明，采样温度和气体组成改变了重金属化合物的形态。3)利用反应动力学理论估算尾气中重金属的状态变化。通过反应动力学计算，研究了尾气中铅化合物颗粒生成率随温度的变化规律。4)重金属有效分离方法的研究在以上讨论的基础上，讨论了采样温度和停留时间等对重金属分离最有效的条件。较少

To analyze behavior of heavy metal compounds in exhaust gas from waste heat treatment process, single straight tube type simulator has been developed. The simulator is capable of simulating status change of exhaust gas components such as heavy metals and toxic gases as SO_2 and HCl. Calculated and experimental states of exhaust gas through the simulator by controlled temperature and flow rate have been compared. To discuss possibility of heavy metal compounds separation technology from industrial waste, following items have been discussed.1)Experimental investigation of heavy metals behavior in waste heat treatment process simulatorWaste heat treatment process simulator which consists of waste heat treatment exhaust gas generator and state-controlled sampler has been developed. The exhaust gas can treat wastes up to 1100℃ and provide exhaust gas up to 10L/min to the state-controlled sampler. For particulate and gas sampling from exhaust gas at various temperatures, the state-controlled … More sampler has three stage quartz filter thimbles at independently-controlled temperature from 800 to 200℃ through a straight sampling tube. Behavior of heavy metals has been investigated by temperature and residence time which has been controlled by flow-rate and quartz filter thimbles' position. From the results, particle generation ratio difference by temperature and residence time has been observed.2)State estimation of exhaust gas include heavy metals by thermodynamic equilibrium simulationExhaust gas state through the state-controlled sampler has been simulated by thermodynamic equilibrium calculation. From the result, heavy metals compounds state has been changed by sampling temperature and gas composition. Therefore, possibility of heavy metals separation technology has been indicated.3)State change estimation of heavy metals in exhaust gas by reaction kinetics theoryLead compounds particle generation rate in exhaust gas by temperature has been investigated by reaction kinetics calculation. From the results, particle generation mechanism has been suggested to be rather phase change such as condensation than chemical reaction.4)Investigation of effective method of heavy metals separationFrom the all discussions above, most effective condition settings for heavy metals separation such as sampling temperature and residence time have been discussed. Less