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Mercury in Polish Coking Bituminous Coals
Energy & Fuels ( IF 5.3 ) Pub Date : 2018-01-11 00:00:00 , DOI: 10.1021/acs.energyfuels.7b03512
Piotr Burmistrz 1 , Krzysztof Kogut 1 , Marta Marczak 1 , Tadeusz Dziok 1 , Jerzy Górecki 1
Affiliation  

Poland emits 10.58 Mg of mercury to the atmosphere annually. More than 90% of this emission is generated by combustion and thermochemical usage of coal, including coking. In Poland, the coking industry consumes more than 12 million Mg of bituminous coals each year. Contrary to lignites and subbituminous coals used in power plants, there is not much reliable data on mercury content in Polish bituminous coals. The purpose of this paper was to determine mercury content in bituminous coals delivered to Polish coke plants and to analyze possible removal of mercury during coal cleaning processes. Eighty-two samples from 9 mines were analyzed. The average mercury content varied from 28.4 to 182.6 μg kg–1, with a mean value of 75.9 μg kg–1. The analysis of mercury content in three coals treated by (i) flotation, (ii) dense-media washing, and (iii) jig washer cleaning, revealed that mercury content in relation to net calorific value can be reduced by 27% (flotation) to 71% (dense-media washing). In addition, distribution of mercury, ash, and sulfur between products and rejects in the process of coal cleaning was determined. For this purpose samples of raw coals, clean coals, middling products and rejects derived from six coal preparation plants were examined (67 samples). The publication presents the mercury balance results for bituminous coal coking. The mercury is transferred to coal tar (75%, mean mercury content 2007 μg kg–1), coke (6%, 7.5 μg kg–1), sulfur (2%, 2998 μg kg–1) and purified coke oven gas (3%, 7.5 μg m–3). Balance data shows that almost 14% of mercury is emitted to the atmosphere during the process of filling the coke oven chambers with coal.

中文翻译:

波兰焦化烟煤中的汞

波兰每年向大气排放10.58 Mg汞。超过90%的这种排放是由煤的燃烧和热化学使用(包括焦化)产生的。在波兰,焦化行业每年消耗超过1200万毫克的烟煤。与发电厂中使用的褐煤和次烟煤相反,波兰烟煤中的汞含量没有可靠的数据。本文的目的是确定交付给波兰焦化厂的烟煤中的汞含量,并分析在煤炭清洁过程中可能去除的汞。分析了来自9个矿山的82个样品。平均汞含量为28.4至182.6μgkg –1,平均值为75.9μgkg –1。通过(i)浮选,(ii)重介质洗涤和(iii)夹具清洗处理的三种煤中的汞含量分析显示,相对于净热值,汞含量可降低27%(浮选)到71%(密集介质清洗)。此外,还确定了在煤清洁过程中,产品与废品之间汞,灰分和硫的分布。为此,检查了来自六个选煤厂的原煤,清洁煤,中间产品和废品的样品(67个样品)。该出版物介绍了烟煤焦化中汞平衡的结果。汞被转移到煤焦油中(75%,平均汞含量为2007μgkg –1),焦炭(6%,7.5μgkg –1),硫(2%,2998μgkg –1))和纯净的焦炉气(3%,7.5μgm –3)。平衡数据显示,在用煤填充焦炉室的过程中,几乎有14%的汞排放到大气中。
更新日期:2018-01-11
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