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Mathematical Modeling of a 2.4 MW Swirling Pulverized Coal Flame
Abstract Predictions and measurements of a swirling unstaged, high NO x, pulverized coal flame are presented. The predictions have been obtained by means of relatively simple models for turbulence, turbulent combustion and turbulent nitric oxide chemistry. Turbulence is modeled using the standard k-epsilon model.
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A dynamic mathematical model for microbial removal of pyritic sulfur ...
A dynamic mathematical model has been developed to describe microbial desulfurization of coal by Thiobacillus ferrooxidans. The model considers adsorption and desorption of cells on coal particles and microbial oxidation of pyritic sulfur on particle surfaces. The influence of certain parameters, su .
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Mathematical Model of Coal Mine Gas and Coal Dust Control
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 in production. In this paper, the programming model is used to find the best ventilation rate and then control the mine gas and coal dust concentration effectively.
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Mathematical Modeling in Mathematics Education: Basic Concepts and ...
Mathematical modeling and its role in mathematics education have been receiving increasing attention in Turkey, as in many other countries. The growing body of literature on this topic reveals a variety of approaches to mathematical modeling and related concepts, along with differing perspectives on the use of mathematical ...
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Statistical modeling of an integrated boiler for coal fired thermal ...
Valsalam et al. developed mathematical model for the 210 MW coal-fired boiler for which MPC controller was designed to control the steam from superheater. A general investigation on modeling, identification and control of the coal fired thermal power plants are provided by Sreepradha et al. . Subsequently, authors recommended for the ...
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Mathematical Model of Heat Transfer for Tuyere Under Non-transparent ...
mathematical model to simulate heat transfer, devolatilization and combustion process of coal inside tuyere and discussed the effect of different parameters on pulverized-coal combustion in tuyere channel. Through numerical simulation, Du and Chen (2006) found double lances greatly reducing the operating
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Mathematical model for coal gasification under pressure. I
The model formulation is based on the coupling of chemical reactions and transport processes and is focused on three processes: the diffusion of reaction gas through the boundary film which surrounds the solid phase (the coal), the diffusion of the reaction gas in the porous system, and the chemical reaction on the phase boundary surface.
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Modeling the Viability of Underground Coal Fires as a Heat Source for ...
The Mathematical Model The basis of the mathematical model for this study is an extension of Eskilson (1987). A series of ... observations at the underground coal mine fire near Sheridan, WY, model parameters were as follows: • borehole radius: 76 mm • rock thermal conductivity: 2.1 W/(m-K)
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Mathematical model for integrated coal fired thermal boiler using ...
This paper considers formulation of simple mathematical models for integrated boiler units based on first principle laws (excluding furnace). The derived equations are validated with the real-time plant data from 210 MW coal-fired thermal power plant.
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Environmental costs estimation and mathematical model of marginal ...
Aug 20, 2021An increase in electricity production is proportional to environmental risks due to continuous energy production. The paper aims to quantitatively estimate the environmental costs and mathematically model the marginal social cost associated with the lifespan of the coal power plants.
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A mathematical programming model for achieving total ... - DeepDyve
Read "A mathematical programming model for achieving total emission control in the petroleum refining industry, International Journal of Oil, Gas and Coal Technology" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
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A mathematical model to characterize the degree of ... - PubMed
A mathematical model to characterize the degree of coalification based on the low-angle region of the X-ray diffractogram Authors Jiadong Yu 1 2, Yaqun He 1 2 3, Juan Hao 1 2, Fengyongzheng Liu 2, Hong Li 1 2, Chao Wang 3, Haifeng Wang 1 2 Affiliations
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Energies | Free Full-Text | Dual-Zone Gas Flow Characteristics for Gas ...
Gas drainage in deep coal seam is a critical issue ensuring the safety of mining and an important measure to obtain gas as a kind of clean available energy. In order to get a better understanding of gas flow and diffusion for gas drainage in deep coal seams, a dual-zone gas flow model, including the drainage damage zone (DDZ) and the non-damaged zone (NDZ), are characterized by different ...
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Development of a mathematical model for simulation of coal crushing in ...
Using the basic size-mass balance size reduction model for a continuous crushing operation and invoking the concept of a perfectly mixed system, a mathematical relationship has been obtained between the feed and product size distributions for a hammer mill. The model parameters 'breakage distribution function' for different size fractions of a Prime Coking Coal and an imported coal were ...
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Research on the mathematical modeling Protodyakonov coefficient of coal ...
Mathematical model between the shearer motor working parameters and the hardness of coal and rock is established, by analysis of the stress combined with the mechanical model of the pick cutting coal and rock. It provides mathematical basis about the test data to verify the result of the experiment.
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Establishment and Research of Coal Blending Mathematical Model | IEEE ...
Abstract: According to the intricacies of the actual coal blending operation, based on the analysis of large amounts of data, applying mathematical modeling and the principle of lowest cost to establish model. Constraints were developed relying on the linear additive of the indicator to simplify the practical problems and abstract the reasonable mathematical structure, so it can solve the ...
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Mathematical Modeling for Underground Coal Gasification
With a focus on the chemical reactions in UCG and treating the underground coal cavity as natures own chemical reactor, various mathematical modeling studies that serve to unravel some of the mysteries of this decades-old technique will be revealed. Read more Product details Publisher : Momentum Press (September 26, 2017)
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Fine Coal Transfer Scheduling Model from Coal Mill 4K3 Machine ... - Unand
This research resulted the mathematical model of fine coal transfer scheduling from Coal Mill 4K3 machine to Kiln Indarung II/III and IV in PT Semen Padang. The model is made able to determine the transfer decision on the day-i, workhour-j for Kiln-k optimally. This is evidenced by the model output through Lingo software resulting the total ...
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Mathematical Modelling for Coal Fired Supercritical ... - SpringerLink
A mathematical model for coal fired power generation with the supercritical boiler has been presented in the paper. The model is based on thermodynamic laws and engineering principles. The model parameters are identified using on-site operating data recorded. The model is then verified by using different data sets and the simulation results ...
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Subsidence and Heat Propagation Modeling on The Underground Coal ...
Asadi, A., Shahriar, K., Goshtasbi, K. and Najm, K. (2005) "Development of a new mathematical model for prediction of surface subsidence due to inclined coal-seam mining," Journal of The South African Institute of Mining and Metallurgy, 105(1), pp. 15-20.
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Mathematical Modelling of Coal Gasification Processes - ResearchGate
Mathematical Modelling of Coal Gasification Processes T Sundararajan*,V Raghavan, A Ajilkumar, K Vijay Kumar Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai,...
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Mathematical Model Demonstrates High Viral Transmissions Reduce ...
Feb 22, 2022A mathematical model demonstrated that high transmission rates among highly vaccinated populations of COVID-19 ultimately reduce the numbers of severe cases. This model suggests a clue as to when this pandemic will turn into an endemic. ... Parliamentary Inquiry to examine safety culture in coal mining industry. 5:52 pm AEST. 100 years of SIL ...
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mathematical model of a ball mill - paviljoen7
A. Modelling Study of Tube Ball Mills 1. Initial Model of the Tube-Ball Mill The mathematical model of the Tube-Ball mill was developed based on fluid mechanics; principles electrical engineering, thermodynamics and aerodynamics Wt K A t K A t cfP fP ()=⋅ + ⋅ 11 2 2 (1) As the total mass of coal fed into the mill per hour is given in
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A Mathematical Model of Coal-gas Flow Conveying In the Process of Coal ...
The mathematical model which is a new method for engineering calculation of outburst two-phase flow can both estimate the coal particles conveying distance according to the initial state of coal seam and inverse the initial energy of coal-gas flow according to the coal particles conveying distance record on spot
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Application of an improved naive Bayesian analysis for the ...
1 day agoMainly No. 4 coal is mined in the working face, the thickness of the coal seam is 0 ~ 34.28 m, the original gas content of the coal seam is 3.48 m 3 /t, and the gas pressure is 0.4 MPa, which ...
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(PDF) A mathematical Model for Chimney - researchgate
A mathematical model for the thermal oxidation of coal in a pseudo-fluidized catalyst bed is suggested. A three-phase system: catalyst, gas and coal, is considered.
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A mathematical model is to be designed to simulate | Chegg
A mathematical model is to be designed to simulate the below plant in Matlab to find the coal flow rate vs temperature change relationship . The plant process is as below Changing the coal flow rate should increase the furnace temperature . Coal flow range is 0 to 25tph . Temperature range is 0 to 1000 degrees .
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Building of a Mathematical Model for the Reduction of Iron Ore in Ore ...
Abstract A non-isothermal and non-isobaric mathematical model which consists of 19 independent equations, was developed for the study of the kinetics of reduction iron ore in an ore/coal composite, based on experimental condition with furnace temperature of 1200ºC and ore/coal ratio of 80/20.
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Comprehensive mathematical model for coal combustion in a circulating ...
A core-annular structure was assumed in the dilute area rather than a one-dimensional model. The submodels were combined to build the comprehensive model to analyze the combustion in a circulating fluidized bed combustor and the effect of operating parameters on the coal combustion. The model predictions agree well with experimental results.
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Development of Mathematical Model for Co-firing Pulverized Coal and ...
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.
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"Mathematical model of coal seam methane displacement by injecting CO2 ...
Mathematical model of coal seam methane displacement by injecting CO2/nitrogen Gongda Wang, China Coal Research Institute, University of Wollongong, China University of Mining and Technology Follow Ting X. Ren, University of Wollongong Follow Qingxin Qi, Central Coal Mining Research Institute Jian Zhang, University of Wollongong Follow
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Study on the gas desorption law and indicator influencing ... - Nature
Alexeev et al. 5 divided the gas migration velocity of coal seams into two parts, diffusion velocity and seepage velocity, established a mathematical model of coal seam gas migration, and studied ...
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A mathematical model for a combined cycle power plant process ...
A comprehensive mathematical model for the simulation of the steady state behavior of a combined cycle power plant will be presented. This combined cycle consists of the subsystems pressurized circulating fluidized bed combustor (PCFBC), complete water/steam cycle and gas turbine.
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Mathematical model for coal gasification under pressure. II
The model considers four reaction zones, including the oxidation zone, the reduction zone, the degasification zone, and the drying zone. The reactions which take place in the various zones are discussed, taking into account the mathematical representation of the process characteristics and suitable model simplifications. Attention is given to a number of specific selected operational cases ...
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Mathematical Modeling of the Energy Consumption and Carbon Emission for ...
2 Mathematical Model. In the TGR-OBF process, ... the pulverized coal, and the recycle gas, respectively. j = 1∼4 is the heats of carbon combustion, solution loss reaction, coal decomposition, and water decomposition, respectively. 2.3 The Gas Recycling System Model.
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Research on the mathematical modeling Protodyakonov coefficient of coal ...
The stress of roller cutter pick, via the rocker retarding mechanism, is delivered to drag torque of cutting motor output shaft. Mathematical model between the shearer motor working parameters and the hardness of coal and rock is established, by analysis of the stress combined with the mechanical model of the pick cutting coal and rock.
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Mathematical Modeling of Coal Gasification Processes in a Well- Stirred ...
Yip et al.13developed a 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.
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Improvement on mathematical model for studying coal's propensity for ...
This study aims to improve the previous mathematical model developed by the authors for studying a coal's propensity for spontaneous combustion. It enhances the model's ability to consider the...
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Mathematical modeling and simulation of coal co-gasification with waste ...
Dive into the research topics of 'Mathematical modeling and simulation of coal co-gasification with waste/biomass in an entrained-flow gasifier'. Together they form a unique fingerprint. Sort by Weight Alphabetically Chemical Compounds. Coal 100%. Solid Waste 85%. Simulation 65%. Sawdust 45%. Gasification 39%. Fuel 28%. Flow 22%. Gas 18% ...
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Semi-quantitative environmental impact assessment and sustainability ...
Environmental impact assessment (EIA) has led to the dominance of planners on the natural environment of the regions, providing the possibility of continuously monitoring and controlling the status quo by management staff. In this regard, a new semi-quantitative model is presented for the EIA of the Eastern Alborz Coal Mining complex using the matrix method, and determining the corresponding ...
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