A 0-dimensional cavity growth submodel for use in reactor models of underground coal gasification
Abstract Modelling of the underground coal gasification process is dependent upon a range of sub-models. One of the most important is the calculation of the cavity growth rate as a function of various operating conditions and coal properties. While detailed 1-dimensional models of coal block gasific...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-08-01
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| Series: | International Journal of Coal Science & Technology |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/s40789-019-00269-0 |
| _version_ | 1818428426730602496 |
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| author | Greg Perkins |
| author_facet | Greg Perkins |
| author_sort | Greg Perkins |
| collection | DOAJ |
| description | Abstract Modelling of the underground coal gasification process is dependent upon a range of sub-models. One of the most important is the calculation of the cavity growth rate as a function of various operating conditions and coal properties. While detailed 1-dimensional models of coal block gasification are available, it is not easy to couple them directly with reactor models, which aim to simulate the complete process. In this paper, a 0-dimensional cavity growth sub-model is presented. The model is based on the concept of a surface reaction and incorporates physics to account for moisture evaporation, water influx, coal pyrolysis, coal thermo-mechanical fragmentation and the build up of an ash layer on the char. The model is validated using measurements from laboratory experiments on coal cores and coal blocks. A comparison of calculated results from several UCG field trials shows that the model can provide good estimates of cavity growth rate for reasonable input parameters. Finally, simulation results of cavity growth in the combustion and gasification zones as a function of the bulk gas temperature, gas pressure, water influx rate, ash layer thickness and coal fragmentation behaviour are presented. |
| first_indexed | 2024-12-14T15:01:26Z |
| format | Article |
| id | doaj.art-0090c2ded5c34b679f664df124368eb3 |
| institution | Directory Open Access Journal |
| issn | 2095-8293 2198-7823 |
| language | English |
| last_indexed | 2024-12-14T15:01:26Z |
| publishDate | 2019-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | International Journal of Coal Science & Technology |
| spelling | doaj.art-0090c2ded5c34b679f664df124368eb32022-12-21T22:56:48ZengSpringerOpenInternational Journal of Coal Science & Technology2095-82932198-78232019-08-016333435310.1007/s40789-019-00269-0A 0-dimensional cavity growth submodel for use in reactor models of underground coal gasificationGreg Perkins0Martin Parry TechnologyAbstract Modelling of the underground coal gasification process is dependent upon a range of sub-models. One of the most important is the calculation of the cavity growth rate as a function of various operating conditions and coal properties. While detailed 1-dimensional models of coal block gasification are available, it is not easy to couple them directly with reactor models, which aim to simulate the complete process. In this paper, a 0-dimensional cavity growth sub-model is presented. The model is based on the concept of a surface reaction and incorporates physics to account for moisture evaporation, water influx, coal pyrolysis, coal thermo-mechanical fragmentation and the build up of an ash layer on the char. The model is validated using measurements from laboratory experiments on coal cores and coal blocks. A comparison of calculated results from several UCG field trials shows that the model can provide good estimates of cavity growth rate for reasonable input parameters. Finally, simulation results of cavity growth in the combustion and gasification zones as a function of the bulk gas temperature, gas pressure, water influx rate, ash layer thickness and coal fragmentation behaviour are presented.http://link.springer.com/article/10.1007/s40789-019-00269-0Underground coal gasificationCavity growthChemical reaction |
| spellingShingle | Greg Perkins A 0-dimensional cavity growth submodel for use in reactor models of underground coal gasification International Journal of Coal Science & Technology Underground coal gasification Cavity growth Chemical reaction |
| title | A 0-dimensional cavity growth submodel for use in reactor models of underground coal gasification |
| title_full | A 0-dimensional cavity growth submodel for use in reactor models of underground coal gasification |
| title_fullStr | A 0-dimensional cavity growth submodel for use in reactor models of underground coal gasification |
| title_full_unstemmed | A 0-dimensional cavity growth submodel for use in reactor models of underground coal gasification |
| title_short | A 0-dimensional cavity growth submodel for use in reactor models of underground coal gasification |
| title_sort | 0 dimensional cavity growth submodel for use in reactor models of underground coal gasification |
| topic | Underground coal gasification Cavity growth Chemical reaction |
| url | http://link.springer.com/article/10.1007/s40789-019-00269-0 |
| work_keys_str_mv | AT gregperkins a0dimensionalcavitygrowthsubmodelforuseinreactormodelsofundergroundcoalgasification AT gregperkins 0dimensionalcavitygrowthsubmodelforuseinreactormodelsofundergroundcoalgasification |