The influence of long-term storage on thermal behaviour of lower rank coal on the example of Polish coals. Part 2. The influence of expired ibuprofen (IB) and aspirin (AS) on changes in volume of long-term stored coal and on the composition of condensed material (CM) on the surface of grains

摘要

The influence of ibuprofen (IB) and aspirin (AS) additives on the changes in volume of the carbonized charge of long-term stored coal (LTSC) was investigated in a laboratory coking oven using X-raying. An almost 1.4-fold decrease of the growth in volume of the carbonized charge under the influence of AS and a twofold increase of the growth in volume of the charge under the influence of IB at the stage of coal grain swelling were observed. The carbonized swollen grains from the charge were rinsed in an ultrasonic washer to separate the condensed material (CM) on the surface of grains. The obtained CM was analyzed by the UV and FT-IR spectroscopies. The LTSC samples with and without additives were pyrolyzed in a TG/FT-IR measuring set. An increase in yield of the volatile products of pyrolysis of LTSC with additives and the changes in their composition under the influence of additives were stated.