Determination of mercury thermospecies in South African coals in the enhancement of mercury removal by pre-combustion technologies.
Determination of mercury thermospecies in South African coals in the enhancement of mercury removal by pre-combustion technologies.
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DOI：
10.1038/s41598-020-76453-z
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发表时间：
2020-11-06
影响因子：
4.6
通讯作者：
Mandiwana K
中科院分区：
文献类型：
--
作者：
Mathebula MW;Panichev N;Mandiwana K
使用RA - 915 +塞曼汞分析仪对南非烟煤样本进行了总汞（Hg）及汞热形态浓度分析。煤炭样本（n = 57）中的总汞浓度在10纳克/克到493纳克/克之间，平均值为150 ± 53纳克/克。汞的热形态是通过监测汞响应随样品温度的变化来确定的，温度从环境温度以0.8°C/秒的速率升高到720°C。这种方法提供了有关汞形态热释放的重要信息，这通过它们在特定温度区间的出现得以体现。这使得能够识别煤炭中汞热形态的存在，并在每个时间（温度）区间对其进行定量。研究发现，76%的受试烟煤样本在低温区间（20 - 180°C和180 - 360°C）释放汞形态。本研究中产生的信息将有助于选择适合进行燃烧前处理的煤炭，这能够显著减少发电站煤炭燃烧过程中的大气汞排放。这种分析方法还可用于创建一个基于各种汞热形态释放温度的煤炭分类系统。
Samples of South African bituminous coals were analysed for total mercury (Hg) and Hg thermospecies concentrations using an RA-915 + Zeeman Mercury Analyser. Total mercury concentrations in samples of coals (n = 57) ranged between 10 ng g−1 and 493 ng g−1 with a mean value of 150 ± 53 ng g−1. Thermospecies of Hg were determined by monitoring Hg response as a function of sample temperature, increasing at 0.8 °C/s from ambient to 720 °C. This approach provides important information on thermal release of Hg species, as indicated by their appearance over specific temperature intervals. This permits identification of the presence of Hg thermospecies in coal and their quantification in each time (temperature) interval. It was found that 76% of tested bituminous coal samples release Hg species within low temperature intervals (20–180 °C and180–360 °C). The information generated in this study will aid in the selection of suitable coals for pre-combustion treatment that can lead to significant reduction of atmospheric Hg emission during coal combustion at power stations. This analytical approach can also be used for the creation of a system of coal classification based on the temperature of release of various Hg thermospecies.
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