NH3 and HCN formation during the gasification of three rank-ordered coals in steam and oxygen
A Victorian brown coal (68.5% C), a Chinese high-volatile Shenmu bituminous coal (82.3% C) and a Chinese low-volatile Dongshan bituminous coal (90% C) were gasified in a fluidised-bed/fixed-bed reactor at 800 °C in atmospheres containing 15% H2O, 2000 ppm O2 or 15% H2O + 2000 ppm O2. While the gasif...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Published: |
Elsevier Science Ltd
2008
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| Online Access: | http://hdl.handle.net/20.500.11937/4762 |
| _version_ | 1848744606960713728 |
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| author | McKenzie, L. Tian, F. Guo, X. Li, Chun-Zhu |
| author_facet | McKenzie, L. Tian, F. Guo, X. Li, Chun-Zhu |
| author_sort | McKenzie, L. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | A Victorian brown coal (68.5% C), a Chinese high-volatile Shenmu bituminous coal (82.3% C) and a Chinese low-volatile Dongshan bituminous coal (90% C) were gasified in a fluidised-bed/fixed-bed reactor at 800 °C in atmospheres containing 15% H2O, 2000 ppm O2 or 15% H2O + 2000 ppm O2. While the gasification of these coals in 2000 ppm O2 converted less than 27% of coal-N into NH3, the introduction of steam played a vital role in converting a large proportion of coal-N into NH3 by providing H on char surface. The importance of the roles of steam in the formation of NH3 in atmospheres containing 15% H2O + 2000 ppm O2 decreased with increasing coal rank. This is largely due to the slow gasification of high-rank coal chars, resulting in low availability of H on char surface. The gasification of chars from the high-rank coal appears to produce higher yields of HCN than that of lower rank coals, probably as a result of the decomposition of partially hydrogenated/broken/activated char-N structures during gasification at high temperature. The alkali and alkaline earth metallic species in brown coal tend to favour the release of coal-N as tar-N but have limited effects on char-N conversion during gasification. |
| first_indexed | 2025-11-14T06:04:09Z |
| format | Journal Article |
| id | curtin-20.500.11937-4762 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:04:09Z |
| publishDate | 2008 |
| publisher | Elsevier Science Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-47622017-09-13T14:48:43Z NH3 and HCN formation during the gasification of three rank-ordered coals in steam and oxygen McKenzie, L. Tian, F. Guo, X. Li, Chun-Zhu HCN Gasification NH3 A Victorian brown coal (68.5% C), a Chinese high-volatile Shenmu bituminous coal (82.3% C) and a Chinese low-volatile Dongshan bituminous coal (90% C) were gasified in a fluidised-bed/fixed-bed reactor at 800 °C in atmospheres containing 15% H2O, 2000 ppm O2 or 15% H2O + 2000 ppm O2. While the gasification of these coals in 2000 ppm O2 converted less than 27% of coal-N into NH3, the introduction of steam played a vital role in converting a large proportion of coal-N into NH3 by providing H on char surface. The importance of the roles of steam in the formation of NH3 in atmospheres containing 15% H2O + 2000 ppm O2 decreased with increasing coal rank. This is largely due to the slow gasification of high-rank coal chars, resulting in low availability of H on char surface. The gasification of chars from the high-rank coal appears to produce higher yields of HCN than that of lower rank coals, probably as a result of the decomposition of partially hydrogenated/broken/activated char-N structures during gasification at high temperature. The alkali and alkaline earth metallic species in brown coal tend to favour the release of coal-N as tar-N but have limited effects on char-N conversion during gasification. 2008 Journal Article http://hdl.handle.net/20.500.11937/4762 10.1016/j.fuel.2007.07.004 Elsevier Science Ltd restricted |
| spellingShingle | HCN Gasification NH3 McKenzie, L. Tian, F. Guo, X. Li, Chun-Zhu NH3 and HCN formation during the gasification of three rank-ordered coals in steam and oxygen |
| title | NH3 and HCN formation during the gasification of three rank-ordered coals in steam and oxygen |
| title_full | NH3 and HCN formation during the gasification of three rank-ordered coals in steam and oxygen |
| title_fullStr | NH3 and HCN formation during the gasification of three rank-ordered coals in steam and oxygen |
| title_full_unstemmed | NH3 and HCN formation during the gasification of three rank-ordered coals in steam and oxygen |
| title_short | NH3 and HCN formation during the gasification of three rank-ordered coals in steam and oxygen |
| title_sort | nh3 and hcn formation during the gasification of three rank-ordered coals in steam and oxygen |
| topic | HCN Gasification NH3 |
| url | http://hdl.handle.net/20.500.11937/4762 |