18.無灰炭製造プロセスにおける水銀分配挙動の評価

概要

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An innovative process to produce ash-free coal has been developed based on the coal liquefaction with organic solvent extraction. During the manufacturing process for this ash-free coal called hyper coal (HPC), 70wt% (daf basis) of raw coal can be extracted in 1-methylnaphthalen as an organic solvent at 633K, reducing the ash and alkali contents to less than 100ppm and 0.5ppm, respectively. On the other hand, it's also important to pay attention to the behaviors of trace elements (arsenic, boron, cadmium, lead, mercury, selenium) during the process for the ash-free coal, because such toxic elements emission to the environment should be controlled. In particular, emission of mercury from a coal combustion process to the atmosphere has been becoming one of the most serious problems in the coal use all over the world. Therefore, in the present study, various intermediate products such as coal-organic solvent slurry were sampled from the HPC manufacturing process, and analyzed for mercury contents to investigate the mass balance and the behavior of mercury in the process.
社団法人日本エネルギー学会の論文
2006-10-12