Community Research and Development Information Service - CORDIS

Abstract

Coal burning power plants need to have high temperature regenerable compounds that will remove the toxic pollutant hydrogen sulphide from the coal gas prior to its expulsion into the environment. Research was carried out into the binding ability of certain compounds that have shown previous affinities for sulphur. Preliminary studies involved zinc species heated to high temperatures in the presence of sulphur and hydrogen sulphide. The amount of sulphur removal was measured in both cases. All the prepared compounds had high sulphur retaining properties but most increased in efficiency when in the presence of hydrogen sulphide. A study carried out in a fixed-bed micro-reactor showed that there was little dependence on temperature at the high levels of 550-650degreeC, but the concentration of hydrogen sulphide had a great influence on the degree of capture by the regenerating species. Following the binding of sulphur, the species were regenerated at 760degreeC using gas with 3% oxygen, 30% water and a balance of nitrogen. Once regenerated the compounds were repeatedly taken through the testing cycle to ensure that they didn't loose their ability to remove hydrogen sulphide the older they got. It was found that some of the compounds displayed decreasing reactivity with the increasing number of cycles performed.

Additional information

Authors: IBARRA J, CSIC, Instituto de CarboquÝmica, Zaragoza (ES)
Bibliographic Reference: EUR 17924 ES (2000) 186 pp., EUR 31.50
Availability: Available from EUR-OP sales agents
ISBN: ISBN 92-828-5779-4
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