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2019-6-14 In this study, an exploratory mathematical model for the coal conversion process in a lab-scale ISWR originally proposed and built in SKLMF would be firstly established incorporating particle-fluid flow dynamics, multispecies transport and thermal coupling between endothermic gasification and exothermic oxidation reaction.

Coal seam permeability variation is affected by many constraints, of which the effective stress and swelling-shrinkage of the coal matrix are the major factors in the process of coal adsorption and desorption. In these two aspects, according to the volume invariance

Mathematical Model of Coal Mine Gas and Coal Dust Control. Article Preview. Abstract: The best is to read these instructions and follow the outline of this text. The coal mine production safety is one of China's current problems to be solved, do a good job monitoring and control of underground gas and coal dust is a key link to achieve safety

3. Mathematical Model Analysis and Discussion. Liang et al. considered that coal temperature might be reduced by 5°C or so during gas drainage in “the mathematical model and numerical solution of gas flow under unequal temperature,” which cannot be ignored during the gas seepage process. The model reflected the effect of temperature on the

A one-dimensional mathematical model for the chemical reaction of a semi-infinite block of coal has been developed and is applied to the problem of simulating underground coal gasification. The model solves conservation equations for mass, momentum, and energy and includes submodels for calculating multicomponent diffusion, based on the Stefan

The use of the model is illustrated in the prediction of steam flow paths, together with an assessment of the influence of the bed voidage on the gas flow. Although the model involves a number of simplifying assumptions, the predictions compare well, in a qualitative sense, with earlier descriptions of gas flow in coke ovens. KW coal. KW

2017-8-25 developed a mathematical model for methane gas migra-tion in coal seams that took into account the effect of the diffusion of adsorbed methane gas from the solid matrix to the voids. A coupled mathematical model for solid deformation and gas ﬂow was proposed by Zhu et al. (2007), and the numerical results indicated that desorption

@article{osti_324695, title = {Nonlinear-programming mathematical modeling of coal blending for power plant}, author = {Longhua, Tang and Junhu, Zhou and Qiang, Yao and Xinyu, Cao and Xiaorong, Wu and Daoqing, Cao and Chungen, Yin and Kefa, Cen}, abstractNote = {At present most of the blending works are guided by experience or linear-programming (LP) which can not reflect the coal complicated

A dynamic mathematical model of an ultra-supercritical coal fired once-through boiler-turbine unit the dynamic mathematical model was extended to be the one with different sets of parameters

2017-8-1 This paper presents a coal mill model that considers the effect of coal moisture on its accuracy. This mathematical model is derived through the analysis of mass flow, heat exchange, and energy transferring balances in which all heat input into or output from the coal mill are calculated quantitatively to reduce the number of unknown parameters that need to be identified.

The use of the model is illustrated in the prediction of steam flow paths, together with an assessment of the influence of the bed voidage on the gas flow. Although the model involves a number of simplifying assumptions, the predictions compare well, in a qualitative sense, with earlier descriptions of gas flow in coke ovens. KW coal. KW

mathematical model will allow to make calculations of parameters of macrokinetics and heat exchange at coal gasification in an ascending stream. Keywords: coal gasification, kinetics, mathematical model, steady-state flow 1. Introduction Coal power industry in Russia is the largest consumer of low-quality Russian steam coal, which is about 90% of

2017-1-24 A mathematical model for outburst coal conveying in the roadway in one-dimensional caseis established, and its reasonableness is proved through resolving an onsite example.-The mathematical model which is a new method for engineering calculation of outburst two- phase flow can both estimate

2020-12-5 The new mathematical model can also predict ash-fusion temperature precisely by considering coal ash ratio in steam coal blending, therefore it is possible to obtain linear relation of ash-fusion temperature between single coal and steam coal blending. The new

2017-8-25 developed a mathematical model for methane gas migra-tion in coal seams that took into account the effect of the diffusion of adsorbed methane gas from the solid matrix to the voids. A coupled mathematical model for solid deformation and gas ﬂow was proposed by Zhu et al. (2007), and the numerical results indicated that desorption

2016-11-22 mathematical model for low-rank coal pyrolysis. This model included the primary and secondary coal pyrolysis reactions and the char gasiﬁcation reaction with the in situ steam which resulted from both coal inherent moisture and pyrolytic water. The results showed that the char yields during pyrolysis decreased with the increase of coal

@article{osti_324695, title = {Nonlinear-programming mathematical modeling of coal blending for power plant}, author = {Longhua, Tang and Junhu, Zhou and Qiang, Yao and Xinyu, Cao and Xiaorong, Wu and Daoqing, Cao and Chungen, Yin and Kefa, Cen}, abstractNote = {At present most of the blending works are guided by experience or linear-programming (LP) which can not reflect the coal complicated

2019-5-11 The mathematical model for co-firing pulverized coal and biomass and the numerical code . Comprehensive axisymmetric 2-D mathematical model in cylindrical co-ordinates is used for numerical prediction of processes in twophase flow under stationary conditions. The -

Appendix A. The common conceptual model applied to coal is that it is a dual-porosity reservoir, where gas is mostly stored in the coal matrix and Darcy fluid flow occurs in the natural fracture system (the contribution of flow in the coal matrix to Darcy flow can be neglected) (Purl et al. 1991; Pan and Connell 2012).The permeability of a coalbed is a function of its fracture system.

the coal hy mass halance. This methodology forms the basis of the present model. For keeping the analysis mathematically tractable, only the compositions of the coal I blend in terms of carbon, hydtOgen, oxygen, nittOgen and sulphur is considered. Other elements are known to occur in coal, but amount to less than 0.3% and ate therefore, ignored.

2020-4-10 Application of mathematical model for the process of coal tar pitch modified petroleum asphalt Yongbing Xue College of Chemical & Biological Engineering, Taiyuan University of Science and Technology, Taiyuan, China Correspondence [email protected]

mathematical model will allow to make calculations of parameters of macrokinetics and heat exchange at coal gasification in an ascending stream. Keywords: coal gasification, kinetics, mathematical model, steady-state flow 1. Introduction Coal power industry in Russia is the largest consumer of low-quality Russian steam coal, which is about 90% of

Appendix A. The common conceptual model applied to coal is that it is a dual-porosity reservoir, where gas is mostly stored in the coal matrix and Darcy fluid flow occurs in the natural fracture system (the contribution of flow in the coal matrix to Darcy flow can be neglected) (Purl et al. 1991; Pan and Connell 2012).The permeability of a coalbed is a function of its fracture system.

2012-7-20 QI Yongfeng1,ZHANG Mingchuan2,YU Juan2. Mathematical Model of Pulverized Coal Ignition and Combustion Considering Various Pyrolysis Products[J]. Journal of

2020-12-5 The new mathematical model can also predict ash-fusion temperature precisely by considering coal ash ratio in steam coal blending, therefore it is possible to obtain linear relation of ash-fusion temperature between single coal and steam coal blending. The new

Such fuels, as a rule, are called coal-water slurries containing petrochemicals (CWSPs). The typical wastes of coal enrichment, low-grade coals, oil production, and oil refining wastes as well as used flammable liquids, for example oils, can be included in the fuel composition. The developed mathematical model and the results of the

mathematical model of benefits and costs by integrating the environmental services derived from revegetation of former coal mining areas, and mine void water as raw water found in this study, can be used to determine the value of the sustainability of the coal mining environment as well as refine the mathematical model of benefits

2016-11-22 mathematical model for low-rank coal pyrolysis. This model included the primary and secondary coal pyrolysis reactions and the char gasiﬁcation reaction with the in situ steam which resulted from both coal inherent moisture and pyrolytic water. The results showed that the char yields during pyrolysis decreased with the increase of coal

the coal hy mass halance. This methodology forms the basis of the present model. For keeping the analysis mathematically tractable, only the compositions of the coal I blend in terms of carbon, hydtOgen, oxygen, nittOgen and sulphur is considered. Other elements are known to occur in coal, but amount to less than 0.3% and ate therefore, ignored.

2021-1-11 In coalbed methane field development, an accurate understanding of dynamic propagation of reservoir pressure is crucial for predicting production potential, enhancing recovery, and engineering planning. Based on actual reservoir conditions and production data, a semi-analytical mathematical model that considers the self-regulating effects of coal reservoirs was established for both

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