97/05080 Estimate of methane emissions from the U.S. natural gas industry: Kirchgessner, D. A. et al. Chemosphere, 1997, 35, (6), 1365–1390
- Book ID
- 104285113
- Publisher
- Elsevier Science
- Year
- 1997
- Weight
- 203 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0140-6701
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✦ Synopsis
recognized as crucial to efficient and economic coal utilization in advanced IGCC processes. The development of regenerahle sorhent materials which can efficiently rescue H$i from several thousand ppmv levels down to a few ppmv over many cycles of sulfidationi regeneration, is important for implementation of hot coal gas desulfurization. Structural stability and good mechanical strength are additional features required of the sorhents. Zinc-based sorhents are currently the leading candidate sorhents, but have been shown to suffer form zinc volatilization at elevated temperatures. This leads to sorbent deterioration, increasing sorbent replacement costs, and the overall cost of hot gas clean-up. Therefore. further improvement is needed to minimize the overall cost of desulfurization in the IGCC process. Recent studies have indicated that system components become prohibitively expensive with increasing operating temperature and that the overall process efficiency gains ot conducting desulfurization at ahove 550°C may not he sufficient to justify operation at such high temperatures. The optimum desulfurization temperature appears to he in the range of 3SO-55O'C. where a large number of metal oxides can he considered for coal gas desulfurization, increasing the likelihood of developing suitable sorhents. This paper discusses the results obtained in an ongoing investigation geared towards developing advanced mixed-metal oxide sorbents for desulfurization of coal-derived fuel gases in the temperature range of 350 to SSO'C. The paper focuses on the study related to the development of durable sorhents and addresses thermodynamic considerations sulfidation kinetics, regenerahility, and long term durability of a number of novel sorbents.