| 摘要 |
A method of reducing the sulfur content of coal, reduced to dust, by means of its own or external thermal energy and by means of rapid coking and/or rapid partial destructive distillation of the coal. The coal dust, which has been ground to less than 0.1 mm and, if necessary, preoxidized in 1 to 4 seconds at 350 DEG to 450 DEG C., is brought to a reaction temperature of 700 DEG to 1100 DEG C. This reaction temperature may be reached directly, either by means of carrier or heating gas heated to over 1000 DEG C., or by means of the partial combustion of the coal with air or oxygen, at heating rates greater than 20,000 DEG C./min. This reaction temperature may also be reached indirectly, at heating rates of less than 20,000 DEG C./min, by means of gaseous, liquid, or turbulent heating carriers. The coal dust is allowed to stand for 1 to 6 seconds at a pressure of 1 to 15 bar until the coke dust and gas which are produced separate from one another. The time the coal dust is allowed to stand is selected in conformity with the H2S content in the resulting gas mixture at the end of this standing time, so that a shorter time is used if the H2S content, at normal pressure, exceeds 0.3% by volume. |
