Improvement of resource recovery rate for underground coal gasification through the gasifier size management

Li, Huaizhan; Zha, Jianfeng; Guo, Guangli; Zheng, Nanshan; Gong, Yaqiang

doi:10.1016/j.jclepro.2020.120911

Cited by 13 publications

(8 citation statements)

References 10 publications

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“…Currently, there is sufficient number of studies analyzing the features of design and technological solutions in terms of expediency of underground gas generator tightness [58][59][60][61], methods of supply and directionality of blow flows with the provided adaptivity and intensification of the processes of coal seam gasification [62][63][64][65] including controlled retracting injection point (CRIP) system [66,67], influence of mining and geological conditions of coal seam occurrence on the underground gasification process [68][69][70][71][72], and influences of underground coal gasification on the environment [46,58,[73][74][75][76].…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies of the Effect of Design and Technological Solutions on the Intensification of an Underground Coal Gasification Process

et al. 2021

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This paper represents the results of experimental studies of physical modeling of the underground coal gasification process in terms of implementation of design and technological solutions aimed at intensification of a gasification process of thin coal seams. A series of experimental studies were performed in terms of a stand unit with the provided criteria of similarity to field conditions as well as kinetics of thermochemical processes occurring within a gas generator. Hard coal (high volatile bituminous coal) was selected as the raw material to be gasified, as that coal grade prevails in Ukrainian energy balance since it is represented by rather great reserves. Five blow types were tested during the research (air, air–steam, oxygen–steam, oxygen–enriched, and carbon dioxide and oxygen). As a result, the effect of tightness of a gas generator on the quantitative and qualitative parameters of coal gasification while varying the blow by reagents and changing the pressure in a reaction channel has been identified. Special attention was paid to the design solutions involving blow supply immediately into the combustion face of a gas generator. The experimental results demonstrate maximum efficiency of the applied gas generator design involving flexible pipelines and activator in the reaction channel and a blow direction onto the reaction channel face combined with blow stream reversing which will make it possible to improve caloricity of the generator gas up to 18% (i.e., from 8.4 to 12.8 MJ/m3 depending upon a blow type). Consideration of the obtained results of physical modelling can be used with sufficient accuracy to establish modern enterprises based on the underground coal seam gasification; this will help develop more efficiently the substandard coal reserves to generate heat energy as well as power-producing and chemical raw material. The research conclusions can provide technical reference for developing a new generation of underground coal gasification technology.

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Section: Introductionmentioning

confidence: 99%

Experimental Studies of the Effect of Design and Technological Solutions on the Intensification of an Underground Coal Gasification Process

et al. 2021

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“…e control targets for solid backfilling in the rock are the key layer, the main roof, and the immediate roof, with the first being the most difficult target and the last being the most precise target. Guo et al [15][16][17], Cha et al [18,19], and Yao et al [20,21] proposed the use of the probability integral method to describe patterns of surface deformation, established a prediction model parameter system for surface subsidence with solid backfilling, and actually measured surface subsidence results using an electronic total station. Fei et al [22] and Niu et al [23] further analysed surface deformation characteristics using the analytic hierarchy process evaluation model and evaluation system.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Control Effect and Parameter Optimisation of Urban Surface Deformation in Underground Coal Mining with Solid Backfilling

Wang

Zhang

et al. 2021

Advances in Civil Engineering

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To solve the problems of surface deformation and destruction of buildings caused by urban mining and realise the coordinated development of mining cities, the solid backfilling method was used to extract coal resources beneath the buildings of Tangshan. Based on surface deformation monitoring data of the continuously operating reference station (CORS) system for the past 5 years, the surface deformation process caused by solid backfilling was analysed. The final results revealed a maximum surface subsidence of 66 mm in the T zone coal area and 31 mm in the F zone area. Furthermore, the surface control effects of the caving method and the solid backfilling method were compared and analysed, and it was shown that solid backfilling could meet the surface building setup requirements. Moreover, based on the probability integral method, the effects on surface deformation due to the surface length of the F zone, compression ratio, and coal pillar width were analysed, and the effects on the prediction results due to the subsidence factor, tangent of the major effective angle, and offset distance of the inflection point were studied. The results showed that the compression ratio is the main factor controlling the surface deformation and that it should be kept above 80% for solid backfilling of urban mines. The subsidence factor should be 0.82, and the tangent of the major effective angle should be 2.15 when the surface subsidence of solid backfilling is to be predicted. This paper provides a technical reference for the realisation of urban mining with solid backfilling.

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“…The control targets for solid back lling in the rock are the key layer, the main roof, and the immediate roof, with the rst being the most di cult target and the last being the most precise target. Guo Guangli [16][17][18] , Cha Jianfeng [19,20] , Yao Qiangling [21,22] proposed the use of the probability integral method to describe patterns of surface deformation, established a prediction model parameter system for surface subsidence with solid back lling, and actually measured surface subsidence results using an electronic total station. Jiang Feifei [23] and Peng Fuhua [24] further analysed surface deformation characteristics using the analytic hierarchy process evaluation model and evaluation system.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Control Effect and Influencing Factors of Urban Surface Deformation in Underground Coal Mining With Solid Backfilling

Wang¹,

Zhang²,

Wu³

et al. 2021

Preprint

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To solve the problems of surface deformation and destruction of buildings caused by urban mining and realise coordinated development of mining cities, the solid backfilling method was used to extract coal resources beneath the buildings of Tangshan. Based on surface deformation monitoring data of the continuously operating reference station (CORS) system for the past 5 years, the surface deformation process caused by solid backfilling was analysed. The final results revealed a maximum surface subsidence of 66 mm in the T zone coal area and 31 mm in the F zone area. Furthermore, the surface control effects of the caving method and the solid backfilling method were compared and analysed, and it was shown that solid backfilling could meet the surface building set-up requirements. Moreover, based on the probability integral method, the effects on surface deformation due to the surface length of the F zone, compression ratio, and coal pillar width were analysed, and the effects on the prediction results due to the subsidence factor, tangent of the major effective angle, and offset distance of the inflection point were studied. The results showed that the compression ratio is the main factor controlling the surface deformation and that it should be kept above 80% for solid backfilling of urban mines. The subsidence factor should be 0.82 and the tangent of the major effective angle should be 2.15 when the surface subsidence of solid backfilling is to be predicted. This paper provides a technical reference for realisation of urban mining with solid backfilling.

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Improvement of resource recovery rate for underground coal gasification through the gasifier size management

Cited by 13 publications

References 10 publications

Experimental Studies of the Effect of Design and Technological Solutions on the Intensification of an Underground Coal Gasification Process

Experimental Studies of the Effect of Design and Technological Solutions on the Intensification of an Underground Coal Gasification Process

Analysis of the Control Effect and Parameter Optimisation of Urban Surface Deformation in Underground Coal Mining with Solid Backfilling

Analysis of the Control Effect and Influencing Factors of Urban Surface Deformation in Underground Coal Mining With Solid Backfilling

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