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首页> 外文期刊>Environmental Science & Technology >Kinetic Rate Laws Of Cd, Pb, And Zn Vaporization During Municipal Solid Waste Incineration
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Kinetic Rate Laws Of Cd, Pb, And Zn Vaporization During Municipal Solid Waste Incineration

机译：城市生活垃圾焚烧过程中Cd，Pb和Zn蒸发的动力学速率定律

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摘要

The kinetic rate laws of heavy metal (HM) vaporization from municipal solid waste during its incineration were studied. Realistic artificial waste (RAW) samples spiked with Pb, Zn, and Cd were injected into a fluidized bed reactor. Metal vaporization wastracked by continuous measure of the above metals in exhaust gases. An inverse model of the reactor was used to calculate the metal vaporization rates from the concentration vs time profiles in the outlet gas. For each metal, experiments were carried out at several temperatures in order to determine the kinetic parameters and to obtain specific rate laws as functions of temperature. Temperature has a strong influence on the HM vaporization dynamics, especially on the vaporization kinetics profile. This phenomenon was attributed to internal diffusion control of the HM release. Two types of kinetic rate laws were established based on temperature: a fourth- or fifth-order polynomial rate law (r(x) = k_0e~(-E_A/RT)p(x)) for temperatures lower than 740 ℃ and a first-order polynomial (r(x) = k_0e~(-E_A/_(RT)) (q-q_f)) for temperatures higher than 740 ℃.
机译：研究了城市固体废物焚烧过程中重金属（HM）蒸发的动力学速率规律。将掺有Pb，Zn和Cd的实际人工废物（RAW）样品注入流化床反应器中。通过连续测量废气中的上述金属跟踪金属的汽化。反应器的逆模型用于根据出口气体中浓度与时间的关系曲线计算金属的蒸发速率。对于每种金属，在几个温度下进行实验，以确定动力学参数并获得特定的速率定律作为温度的函数。温度对HM的蒸发动力学有很大的影响，尤其是对蒸发动力学的分布。该现象归因于HM释放的内部扩散控制。根据温度建立了两种类型的动量率定律：温度低于740℃的四阶或五阶多项式率定律（r（x）= k_0e〜（-E_A / RT）p（x））和一阶温度高于740℃的高次多项式（r（x）= k_0e〜（-E_A / _（RT））（q-q_f））。

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