A review on the water treatment reactor by electron beam

doi:10.16085/j.issn.1000-6613.2017.02.002

Abstract

Abstract: A lot of research has been conducted to study the reaction kinetics of electron beam(EB) treatment of wastewater. However,relatively less attention has been paid to the hydrodynamic behavior and absorbed dose distribution of the EB reactor which is crucially important for the EB treatment efficiency. Existing EB reactors were classified,analyzed and compared in this paper. Advantages and disadvantages of different kinds of EB reactors were briefly discussed. The waterfall and nozzle jet reactors were widely used and their flow coincided well with the requirement of electron beam,but very few systematic studies were conducted on them. The treatment capacity of the spraying reactors was relatively small and there were very few studies on the aerosol flow formed by them. As for up-flow and plate reactors,their absorbed dose distribution was less uniform. All previous studies didn't consider the detailed hydrodynamic of the EB reactor and its effect on the absorbed dose distribution which is also considered as the future research area for EB reactor study. Computational fluid dynamic(CFD) method should be used to study the detailed hydrodynamic of the EB reactor,including the velocity,depth and density distribution of the flow. The Monte Carlo method incorporating CFD simulation result should be used to study the absorbed dose distribution of the flow. The configuration of the EB reactor should be improved to make the absorbed dose distribution more uniform.

Key words: electron beam treatment for wastewater, reactors, fluid mechanics, absorbed dose distribution, CFD, Monte Carlo simulation

摘要： 目前国内外对电子束辐照水处理中反应动力学的研究较为深入，但对反应器流体力学特性和吸收剂量分布规律的研究相对薄弱，而反应器的流体力学特性和吸收剂量分布均匀性决定了辐照水处理的效率。本文对现有电子束辐照水处理反应器进行了分类、分析和对比，并对它们的优缺点进行了讨论：瀑布式和射流式反应器产生的水流与电子束要求的水流特性较为相似，且应用较为广泛，但缺乏系统的研究；喷雾式反应器处理量相对较小且缺乏对其雾化水流的研究；上流式与折流式反应器容易引起水流吸收剂量分布的不均匀。指出了目前反应器研究都没有考虑水流细部的流体力学特性及其对吸收剂量分布均匀性的影响。提出了电子束辐照水处理反应器进一步的研究方向为，采用计算流体力学与蒙特卡罗模拟粒子输运相结合的方法，研究反应器水流流速分布、厚度分布与雾化水流密度分布等流体力学特性与吸收剂量分布规律，并据此优化反应器。

关键词: 电子束辐照水处理, 反应器, 流体力学, 吸收剂量分布, 计算流体力学, 蒙特卡罗模拟

CLC Number:

X703

DING Rui, MAO Zeyu, WANG Jianlong. A review on the water treatment reactor by electron beam[J]. Chemical Industry and Engineering Progree, 2017, 36(02): 410-417.

丁瑞, 茅泽育, 王建龙. 电子束辐照水处理反应器研究进展[J]. 化工进展, 2017, 36(02): 410-417.

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