Abstract
In spite of the complexity of underground coal gasification, the process is sometimes modelled as semi-stationary and the spatial configuration is simplified to two or one dimensions. In some models only global mass and heat balances were used, reducing the geometry to a zero-dimensional problem. Nevertheless, for field applications the time dimension is important. Until now the cavity stability was modelled with a semi-stationary approach, which should include time dependent rock properties. As a first step a model is developed, which couples the heart of the gasification process (the reaction at the coal seam) with the roof response to the intense heating in the gasification tunnel. In this manner an estimation can be obtained of the time scale involved in the growth of the cavity and the configuration (open or rubble filled) can be determined. For a more detailed treatment of the time dependent behaviour of the gasification cavity, measurements of rock properties were needed. For determining the creep properties of carboniferous rock, sampled from coal mine galleries, special equipment is being developed. Together with the existing high temeprature tri-axial cell the creep properties can then be measured over the entire range of temperatures occurring in underground coal gasification. First
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Citation Formats
De Pater, C J, and Hettema, M H.
Time dependence of the stability of the gasification cavity. Final report phase 3A.
Netherlands: N. p.,
1990.
Web.
De Pater, C J, & Hettema, M H.
Time dependence of the stability of the gasification cavity. Final report phase 3A.
Netherlands.
De Pater, C J, and Hettema, M H.
1990.
"Time dependence of the stability of the gasification cavity. Final report phase 3A."
Netherlands.
@misc{etde_10132220,
title = {Time dependence of the stability of the gasification cavity. Final report phase 3A}
author = {De Pater, C J, and Hettema, M H}
abstractNote = {In spite of the complexity of underground coal gasification, the process is sometimes modelled as semi-stationary and the spatial configuration is simplified to two or one dimensions. In some models only global mass and heat balances were used, reducing the geometry to a zero-dimensional problem. Nevertheless, for field applications the time dimension is important. Until now the cavity stability was modelled with a semi-stationary approach, which should include time dependent rock properties. As a first step a model is developed, which couples the heart of the gasification process (the reaction at the coal seam) with the roof response to the intense heating in the gasification tunnel. In this manner an estimation can be obtained of the time scale involved in the growth of the cavity and the configuration (open or rubble filled) can be determined. For a more detailed treatment of the time dependent behaviour of the gasification cavity, measurements of rock properties were needed. For determining the creep properties of carboniferous rock, sampled from coal mine galleries, special equipment is being developed. Together with the existing high temeprature tri-axial cell the creep properties can then be measured over the entire range of temperatures occurring in underground coal gasification. First the new equipment for relatively low temperature measurements is described. Next attention is paid to the model which incorporates the semi-stationary model of Batenburg et al and roof spalling. 15 figs., 1 tab., 12 refs.}
place = {Netherlands}
year = {1990}
month = {Aug}
}
title = {Time dependence of the stability of the gasification cavity. Final report phase 3A}
author = {De Pater, C J, and Hettema, M H}
abstractNote = {In spite of the complexity of underground coal gasification, the process is sometimes modelled as semi-stationary and the spatial configuration is simplified to two or one dimensions. In some models only global mass and heat balances were used, reducing the geometry to a zero-dimensional problem. Nevertheless, for field applications the time dimension is important. Until now the cavity stability was modelled with a semi-stationary approach, which should include time dependent rock properties. As a first step a model is developed, which couples the heart of the gasification process (the reaction at the coal seam) with the roof response to the intense heating in the gasification tunnel. In this manner an estimation can be obtained of the time scale involved in the growth of the cavity and the configuration (open or rubble filled) can be determined. For a more detailed treatment of the time dependent behaviour of the gasification cavity, measurements of rock properties were needed. For determining the creep properties of carboniferous rock, sampled from coal mine galleries, special equipment is being developed. Together with the existing high temeprature tri-axial cell the creep properties can then be measured over the entire range of temperatures occurring in underground coal gasification. First the new equipment for relatively low temperature measurements is described. Next attention is paid to the model which incorporates the semi-stationary model of Batenburg et al and roof spalling. 15 figs., 1 tab., 12 refs.}
place = {Netherlands}
year = {1990}
month = {Aug}
}