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首页> 外文期刊>Journal of Solid Waste Technology and Management >EFFECT OF TEMPERATURE ON SELECTIVE SEPARATION OF METAL IN FLUE GAS FROM THE SEWAGE SLUDGE MELTING PROCESS
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EFFECT OF TEMPERATURE ON SELECTIVE SEPARATION OF METAL IN FLUE GAS FROM THE SEWAGE SLUDGE MELTING PROCESS

机译：温度对污水污泥熔化过程中烟气中金属选择性分离的影响

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摘要

Experimental crucible and pilot tests were carried out to verify the possibility of selective separation of metal in sewage sludge flue gas based on the distillation process. Sewage sludge was combusted at the melting temperature of 1400℃. The fly ash sampling method took place within a controlled temperature range of 300-800℃. The flue gas at the high temperature dust collector with an operating temperature of 650℃ was sampled to examine the actual condition. Thermodynamics equilibrium analysis software was used to simulate the chemical compound in flue gas. The result indicated that elements in flue gas from sewage sludge combustion were composed of alkali elements (Na and K), refractory elements (P, Ca, Mg, Al, Fe and Cr) and volatile metal elements (Zn, As, Pb, Cd and Cu). Based on the experimental and simulative results, the temperature range for phase partition of each metal could be determined, e.g., 650-800℃ for refractory elements (P, Ca, Mg, Al, Fe and Cr), 500-650℃ for Cu, Pb and Zn, 300-500℃ for Cd and below 300℃ for As. From the simulative results, most of metals in the gas phase stayed in the form of chloride compounds whereas the oxide, sulfur, and phosphate compounds were found in the solid phase.
机译：进行了实验坩埚和中试测试，以验证基于蒸馏过程选择性分离污水污泥烟气中金属的可能性。污水污泥在1400℃的熔化温度下燃烧。粉煤灰采样方法是在300-800℃的受控温度范围内进行的。在高温除尘器中以650℃的工作温度对烟气进行采样，以检查实际情况。使用热力学平衡分析软件来模拟烟气中的化合物。结果表明，污水污泥燃烧烟气中的元素由碱金属元素（Na和K），难熔元素（P，Ca，Mg，Al，Fe和Cr）和挥发性金属元素（Zn，As，Pb，Cd）组成。和铜）。根据实验和模拟结果，可以确定每种金属的相分配温度范围，例如难熔元素（P，Ca，Mg，Al，Fe和Cr）为650-800℃，Cu为500-650℃ ，铅和锌，镉为300-500℃，砷为300℃以下。从模拟结果来看，气相中的大多数金属都以氯化物形式存在，而在固相中发现了氧化物，硫和磷酸盐化合物。

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