Kinetics of change in sulphur forms in hydropyrolysis of coals

✍ Scribed by Takuo Sugawara; Katsuyasu Sugawara; the late Hiroyasu Ohashi

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 845 KB
• Volume: 68
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(89)90066-5

✦ Synopsis

Eight kinds of non-caking steam coals were pyrolysed using fixed beds in hydrogen streams at atmospheric pressure and at 30 kg cme2 up to 773 K. Sequential changes were followed in various sulphur forms: pyritic and ferrous sulphide sulphur in the char, and hydrogen sulphide in the gas. The internal surface area was also determined sequentially by the CO, adsorption method. The observed changes in the contents of sulphur forms were successfully simulated kinetically, based on the desulphurization scheme proposed in the authors' previous paper and with help of a volume reaction model. The effects of hydrogen pressure and type of coal on desulphurization behaviour were characterized by a set of frequency factors determined for all the steps included in the scheme proposed. The frequency factors for volatile organic sulphur decomnosition were correlated with chances in the internal surface area within the heat-up period and with the exinite contents in raw coals.