Distribution of Hg, As, Pb, and Cr in a Coke Oven Plant
Distribution of Hg, As, Pb, and Cr in a Coke Oven Plant
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焦炉厂中 Hg、As、Pb 和 Cr 的分布
DOI：
10.1021/ef100652h
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发表时间：
2010-09
期刊：
影响因子：
5.3
通讯作者：
Jing-Jing Ma, Hong Yao, Guang-Qian Luo, Jun Han
中科院分区：
文献类型：
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作者：
Jing-Jing Ma, Hong Yao, Guang-Qian Luo, Jun Han
煤中痕量金属的浓度差异很大，这取决于煤的等级和地质来源。在煤炭利用过程中，这些金属在高温下由固相转变为气相或液相，放大了它们对环境的不利影响。在过去的几十年里，人们对煤热加工过程中痕量金属的分布和转化进行了大量的研究。其中，由于煤炭的巨大消耗，大多数研究集中在燃烧和气化方面，研究热解的研究人员很少。焦化是热解的一种。焦炉炼焦生产的焦炭是现代钢铁生产不可缺少的原料。除了电力和化工行业，焦炭行业是另一个主要的煤炭消费行业，特别是在中国。世界上生产的大约10%的煤炭被加工成焦炭。14作为世界上最大的焦炭生产国和消费国，中国2009年消耗了4.6亿吨煤，生产了3.5亿吨焦炭，占世界总产量的59%以上。而且，随着中国钢铁行业的扩能，焦炭产量和消费量仍在增加。15遗憾的是，由于缺乏相关的基础数据，很难预测或控制全规模焦化过程中的重金属排放。本研究通过对中国大型焦炉的考察，试图为焦化过程中汞、砷、铅、铬等痕量金属的分布和转化提供一些有用的信息。此外，本研究对中国的焦炭行业汞、砷、铅、铬排放总量的估算也有积极的影响。试验是在某钢铁公司大型焦炉厂进行的。焦炉炉膛高度为6.0m，能力为140t/h，工作温度范围为950r1050℃。
Trace metals in coal are in widely varying concentrations, depending on the rank and geological origin. During coal utilization, these metals transform from solid phase to gas phase or liquid phase at high temperature, which magnify their adverse impact on environment. 1r5 Over the last few decades, much research6r10 has been conducted on the distribution and transformation of trace metals during coal thermal processing. Among them, most investigations focused on combustion and gasification due to the huge consumption of coal, and just a few researchers11r14 studied pyrolysis. Coking is a kind of pyrolysis. Coke produced by coal coking in a coke oven is a necessary raw material for modern iron and steel making. Besides the electric power industry and the chemicals industry, the coke industry is another major coal consumer, especially in China. About 10% of coals produced in the world are processed into coke. 14 As the largest coke producer and consumer in the world, China consumed 460 million tons coal and produced 350 million tons coke in 2009, which accounts for over 59% of the total world output. Moreover, with the capacity expansion of the iron and steel industry of China, coke production and consumption are still increasing. 15 Unfortunately, it is difficult to predict or control heavy metal emissions from a full scale coking process due to lacking of related basic data. This study is trying to provide some useful information about distribution and transformation of trace metals such as Hg, As, Pb, and Cr during coking process by investigating a full-scale coke oven in China. Furthermore, the research also has a positive influence on estimating the total emission of Hg, As, Pb, and Cr in the coke industry of China. The experiments were carried out in a large-scale coke oven plant in an iron and steel complex. The height of the chamber of the coking oven is 6.0 m. The capacity of the oven is 140 t/h, and the operating temperature range was 950r1050 C. The