Numerical simulation of coal dust self–ignition and combustion under inclination conditions

Energy ◽  
2022 ◽  
Vol 239 ◽  
pp. 122227 ◽  
Author(s):  
Xueqiang Shi ◽  
Xiaokun Chen ◽  
Yutao Zhang ◽  
Yuanbo Zhang ◽  
Ruizhi Guo ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Coal Dust ◽  
Ignition And Combustion

scholarly journals Modeling of pulverized coal combustion stabilization by means of plasma torches

2005 ◽  
Vol 9 (2) ◽  
pp. 57-72 ◽  
Author(s):  
Miroslav Sijercic ◽  
Srdjan Belosevic ◽  
Predrag Stefanovic
Keyword(s):  
Numerical Simulation ◽  
Coal Combustion ◽  
Coal Dust ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion ◽  
Plasma System ◽  
Utility Boiler ◽  
Plasma Torches ◽  
Combustion Stabilization ◽  
Ignition And Combustion

Application of plasma-system for pulverized coal ignition and combustion stabilization in utility boiler furnaces promises to achieve certain savings compared to the use of heavy oil burners. Plasma torches are built in air-coal dust mixture ducts between coal mills and burners. Characteristics of processes in the ducts with plasma-system for pulverized coal combustion stabilization are analyzed in the paper, with respect to the modeling and numerical simulation of mass, momentum and heat transfer in two-phase turbulent gas-particle flow. The simulations have been performed for three different geometries of the air-coal dust mixture ducts with plasma torches, for TENTAI utility boiler and pulverized lignite Kolubara-Field "D". Selected results of numerical simulation of processes are presented. The plasma-system thermal effect is discussed regarding corresponding savings of liquid fuel. The results of numerical simulations have been analyzed with respect to the processes in the duct and especially with respect to the influence of the duct shape to a temperature field at the outlet cross section, as a basis for the duct geometry optimization. It has been emphasized that numerical simulation of processes can be applied in analysis and optimization of pulverized coal ignition and combustion stabilization and enables efficient and cost-effective scaling-up procedure from laboratory to industrial level.

scholarly journals Additives to Coal-Based Fuel Pellets for the Intensification of Combustion and Reduction in Anthropogenic Gas Emissions

2020 ◽  
Vol 10 (19) ◽  
pp. 6689
Author(s):  
Dmitriy Klepikov ◽  
Tereza Kudelova ◽  
Kristina Paushkina ◽  
Pavel Strizhak
Keyword(s):  
Coal Dust ◽  
Polymer Particle ◽  
Porous Polymer ◽  
Flue Gases ◽  
Sulfur Oxides ◽  
Fuel Composition ◽  
Material Particle ◽  
Wood Sawdust ◽  
Fuel Pellets ◽  
Ignition And Combustion

Cylinder-shaped fuel pellets that were 3 mm in diameter and 3 mm in height, with a mass of 20 mg, were produced by compressing dry coal processing waste under the pressure of 5 MPa. The first group of pellets from coal dust with a particle size less than 140 µm did not contain any additives. The pellets of the second group of fuel compositions contained an oil-impregnated porous polymer material particle with a size of 0.5 mm in the central part of the experimental sample. The particle was surrounded by coal dust from all sides. The ratio of components was 90:10% for coal dust: polymer particle. The latter value almost completely corresponds to the fraction of oil in the fuel composition, since the mass of a porous polymer material particle is negligible. The third group of compositions was a 70:30% mixture of coal dust with wood sawdust with a particle size less than 45 µm, or 45–100, 100–200 and 200–500 µm. The ignition and combustion of single fuel pellets were studied under radiant heating in an air medium while varying the temperature from 800 to 1000 °C. The processes during the fuel combustion were recorded by a high-speed video camera, and the concentrations of the main anthropogenic emissions in flue gases were measured by a gas analyzer. The main characteristics were established—ignition delay times (2–8 s) and duration of burnout (40–90 s)—at different heating temperatures. A difference was established in the combustion mechanisms of the pellets, when adding various components to the fuel mixture composition. This has a direct influence on the induction period duration and combustion time, other conditions being equal, as well as on the concentration of nitrogen and sulfur oxides in the flue gases. Adding an oil-impregnated porous polymer particle to the fuel composition intensifies ignition and combustion, since the times of ignition delay and complete burnout of fuel pellets under threshold conditions decrease by 70%, whereas adding wood sawdust reduces the content of nitrogen and sulfur oxides in the flue gases by 30% and 25%, respectively.

scholarly journals Numerical simulation of combustion of a polydisperse suspension of coal dust in a spherical volume

2016 ◽  
Vol 8 (3) ◽  
pp. 531-539 ◽  
Author(s):  
Alexey Yurjevich Krainov ◽  
Kseniya Mikhailovna Moiseeva ◽  
Dmitrii Yurjevich Paleev
Keyword(s):  
Numerical Simulation ◽  
Coal Dust ◽  
Polydisperse Suspension ◽  
Spherical Volume

scholarly journals Experimental Research and Numerical Simulation of Ejector Precipitator in a Fully Mechanized Mining Face

2020 ◽  
Vol 45 (11) ◽  
pp. 9815-9833
Author(s):  
Guodong Zhai ◽  
Wentao Zhang ◽  
Yaozong Li ◽  
Xinghao Lu ◽  
Wenyuan Hu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Negative Pressure ◽  
Coal Dust ◽  
Structural Parameters ◽  
Dust Concentration ◽  
Dust Removal ◽  
Measuring Point ◽  
Mining Face ◽  
Supply Water

AbstractIn order to effectively reduce the coal dust concentration in a fully mechanized mining face, this research used laboratory experiment, numerical simulation, and field test to conduct an in-depth exploration of the ejector precipitator installed at the low-level caving coal hydraulic support. Firstly, through the experimental platform in the laboratory, the dust removal effect of the nozzle with different structural parameters was tested, and the 3D particle dynamic analyzer was adopted to verify its atomization characteristics; then, the structural parameters corresponding to the nozzle in the best test results were obtained. Secondly, by using Fluent, the negative pressure flow field in the ejector barrel was numerically simulated. The results indicated that when the pressure of supply water was 12 MPa, the negative pressure value formed in the flow field was the lowest and the inspiratory velocity was the largest, which was conducive to dust removal. Finally, the tests of liquid–gas ratio and dust removal ratio were carried out in a fully mechanized mining face. The results showed that when the nozzle specification recommended by the experiment and the pressure of supply water recommended by the numerical simulation were used, the removal ratios of the total coal dust and the respirable coal dust were 89.5% and 91.0%, respectively, at the measuring point of the highest coal dust concentration. It indicates that the ejector precipitator has a good application effect in reducing the coal dust concentration in a fully mechanized mining face and improving the work environment of coal mine workers.

Numerical Simulation of Evaporation,Ignition and Combustion of Transient Sprays

1991 ◽  
Vol 75 (1-3) ◽  
pp. 1-12 ◽  
Author(s):  
Toshimi Takagi ◽  
Chlng Ying Fang ◽  
Takeyuki Kamimoto ◽  
Tatsuyuki Okamoto
Keyword(s):  
Numerical Simulation ◽  
Ignition And Combustion

The Application of Particle Motion Equation in Coal Handling System of Dissipation Dust Law

2013 ◽  
Vol 313-314 ◽  
pp. 702-705
Author(s):  
Shao Cheng Ge ◽  
Yao Xuan Feng ◽  
De Ji Jing
Keyword(s):  
Numerical Simulation ◽  
Field Test ◽  
Particle Motion ◽  
Theoretical Basis ◽  
Coal Dust ◽  
Motion Equation ◽  
Dust Concentration ◽  
Dust Particles ◽  
Space Application ◽  
Handling System

For getting the effectiveof application in dissipation dust law with particle motion equation atcoal handling system of belt machine tail, must be to proceed related numerical simulation in the way of dust particles motion incoal handling system of belt machine tail and dust concentration of diffusion inoperation space. Application particlemotion equation theory for numerical simulation to coal dustparticles, obtained dust coal dissipation law in coal handling system, at thesame time combine with the data of the field test of dust concentration andfallout dispersion for analyzing and comparing. The results of comparison showthat: the data of numerical simulation with particle motion equationin coal dust dissipation law is coincide with reality dissipation law. Accordingto the conclusion of this research, it is provides theoretical basis forprevention and treatment in coal mine of coal handling system of dustdissipation.

Effect of spraying on coal dust diffusion in a coal mine based on a numerical simulation

2020 ◽  
Vol 264 ◽  
pp. 114717 ◽  
Author(s):  
Qingxin Ma ◽  
Wen Nie ◽  
Shibo Yang ◽  
Changwei Xu ◽  
Huitian Peng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Coal Dust ◽  
Dust Diffusion

SIMULATION OF THE AIR-METHANE COAL DUST MIXTURE COMBUSTION IN THE SWISS-ROLL BURNER

2020 ◽  
Author(s):  
L. L. Minkov ◽  
◽  
K. M. Moiseeva ◽  
Keyword(s):  
Numerical Simulation ◽  
Feed Rate ◽  
Coal Dust ◽  
Combustion Process ◽  
Combustion Modes ◽  
Coal Particles ◽  
Steady Combustion

One of the ways to utilize coalmine methane containing coal particles is to use it as a fuel for recuperative type burners that allow sustaining combustion of a lean methane-air mixture. The aim of the work is to study the steady combustion modes of a methane-air mixture containing coal particles in a Swiss-roll burner depending on the feed rate of the mixture and the parameters of the supplied coal-methane-air mixture. The paper considers numerical simulation of the combustion process of the methane-air mixture containing coal dust in a Swiss-roll burner of the recuperative type.

Coal-Dust Motion Law and Control Technology of the Feeder

2011 ◽  
Vol 204-210 ◽  
pp. 928-931
Author(s):  
De Ji Jing ◽  
Shao Cheng Ge ◽  
Jian Liu
Keyword(s):  
Numerical Simulation ◽  
Coal Dust ◽  
Measurement Data ◽  
Dust Control ◽  
Positive Pressure ◽  
Dust Collector ◽  
Coal Preparation ◽  
Dust Pollution ◽  
Control Plan ◽  
Air Volume

The aim of this paper is mainly to study the main coal-dust pollution sources in the coal preparation plants of Ping Shuo Branch of China National Coal Group. Through the combination of many measurement data with numerical simulation of gas-solid two-phase flow, dust precipitation mechanisms have been gained for the feeder in Ping Shuo Coal Preparation Plant. Dust pollution of the feeder is caused by the positive pressure of the induced feeding wind-flow and the bad seal itself. Firstly, the durable flexible seal material is used to seal up the feeder. Secondly, the seal guide-chute with the dust collector is installed on the belt. Finally, the air volume and the pressure of the dust collector are determined by means of numerical simulation, and the reasonability of the plan is explained from the angle of the dust control mechanism. The main technical parameters of the dust control plan, such as the seal guide-chute length, and the air volume and the pressure of the dust collector, are determined through the numerical simulation. The simulation result and the actual result verify the above dust control plans. The study methods and results provide a guide for the dust control in a certain similar business.

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