Experimental study of ash formation during pulverized coal combustion
1.. IntroductionOxy-fuel combustion has been recognized as a promising technology for pulverized coal-fired power plants to control CO 2 emissions. In this process coal is burned in a mixture of oxygen and recycled flue gas (principally CO 2).This produces an exhaust gas with a high concentration of CO 2 ready for sequestration. Techno …
Pulverized coal combustion in boundary layer turbulence …
1. Introduction. Coal is the most abundant fossil fuel, which is mainly burned in pulverized coal combustion systems for power generation. However, the combustion of coal releases significant amount of greenhouse gases such as carbon dioxide (CO …
Pulverized coal combustion in air and in O2/CO2 mixtures …
The comparison of coal burnout efficiencies between coal combustion in air and in 30% O 2 /70% CO 2 for all seven tested coals is presented in Fig. 1.Higher O 2 concentrations in the combustion zone combined with similar combustion temperatures result in better burnout efficiencies with 30% O 2 /70% CO 2 combustion. To some …
Modeling of Pulverized Coal Combustion in Turbulent Flow …
The eddy dissipation concept (EDC) model with the consideration of the intermediate reactions for the volatile matter (VM) combustion was applied to simulate turbulent pulverized coal/air jet combustion adjacent to a bluff-boy type model burner. The VM of the coal was assumed to consist of CO, H2, and CH4, and its chemistry was described …
Characteristics of pulverized-coal combustion in the …
Experimental studies on pulverized coal combustion with oxygen/flue gas recycle for CO2 recovery. JSME-ASME International Conference on Power Engineering-93. September, 1993, Tokyo, Japan. Kimura, N., K. Omata, T. Kiga, S. Takano and S. Shikishima (1994). The characteristics of pulverized coal combustion in O2/CO2 …
Pulverised Coal Combustion
Pulverized coal combustion (PCC) is the most widely used technology for coal power generation. In this process, coal is milled, pulverized, and injected in the boiler with air …
Progress in numerical simulations and fundamental …
The skeletal mechanism was verified as suitable for pulverized coal combustion and its applicability to homogeneous ammonia-doped combustion. It is hoped to be applied to pulverized coal co-firing with ammonia to verify its feasibility and to make predictions of NO x in subsequent work. 4.8. Discrete phase sub-model
Flamelet LES of pulverized coal combustion and NO …
1. Introduction. Coal still plays an important role in the global primary energy consumption [1], and coal-fired power generation is essential for some developing countries in the foreseeable future.Pollutant emissions, such as nitrogen oxides (NO x), during pulverized coal combustion (PCC) have a significant environmental impact.In order to …
Modeling of Pulverized Coal Combustion in Cement Rotary …
In this paper, based on analysis of the chemical and physical processes of clinker formation, a heat flux function was introduced to take account of the thermal effect of clinker formation. Combining the models of gas−solid flow, heat and mass transfer, and pulverized coal combustion, a set of mathematical models for a full-scale cement rotary kiln were …
Modeling of Pulverized Coal Combustion in Turbulent Flow …
The eddy dissipation concept (EDC) model with the consideration of the intermediate reactions for the volatile matter (VM) combustion was applied to simulate turbulent …
Combustion and Flame
The upper stream is initialized with a pulverized coal and ammonia mixture, with the temperature of 600 K and the x velocity Δ U 0 / 2 = 15 m/s.The 3,768,246 coal particles …
Combustion of Pulverised Coal in a Mixture of Oxygen and Recycled …
Combustion of Pulverised Coal in a Mixture of Oxygen and Recycled Flue Gas focuses on a niche technology, combustion of coal in an oxygen rich environment, which is one approach to obtaining 'clean coal,' by making it easier to capture carbon that is released in the combustion process. Toporov's book breaks ground on covering the key …
Combustion visualization analysis of alternative fuels in the
Currently, the steelmaking process uses a pulverized coal injection (PCI) system that serves as the heat source and reductant for ironmaking (blast furnace and FINEX) where system uses expensive high-grade coal and high operating costs. ... Combustion visualization analysis of alternative fuels in the pulverized coal injection …
An experimental study on optimization of ammonia co-firing …
Co-firing ammonia with pulverized coal in power plants has become one of the most feasible options for reducing CO 2 emissions. This study aims to investigate the combustion and NOx emission characteristics for various methods of ammonia injection, and to find an optimal solution for system modifications in a single burner in low co-firing …
Combustion visualization analysis of alternative fuels in the
Currently, the steelmaking process uses a pulverized coal injection (PCI) system that serves as the heat source and reductant for ironmaking (blast furnace and …
Understanding Pulverized Coal Injection in Blast Furnace
Fig 1 Pulverized coal combustion and gas composition in raceway. The extent of combustion (combustion efficiency), and hence the amount of unburnt material transported out of the raceway, depends on several parameters which include (i) properties of the coal, such as the VM content, particle size and density, and (ii) operating …
Optical investigations on particles evolution and flame …
The evolution of soot and coal/char as well as the flame properties, during pulverized coal combustion in O 2 /N 2 and O 2 /CO 2 conditions, were experimentally studied using optical diagnostics. The jet flames of pulverized coal particles were produced by using an entrained-flow reactor with optical access, and the oxygen concentrations of …
NEW TECHNOLOGIES OF PULVERIZED COAL …
In case of pulverized coal combustion, reduction in CO 2 emissions in commonly used technologies is achieved by partial replacement of coal with less carbon-intensive fuels, …
LES and RANS modeling of pulverized coal combustion in swirl …
1. Introduction. Oxy-combustion is one of the technology to reduce the emission of greenhouse gases to the atmosphere [1].Combustion of pulverized coal in a modified O 2 /CO 2 atmosphere differs from the conventional combustion in air in several aspects [2].Recirculation of significant amount of carbon dioxide and water vapor, which …
Numerical Simulation Study of Hydrogen Blending Combustion …
Hydrogen blending of pulverized coal in boilers is a promising technology. However, there are few studies on hydrogen blending in coal-fired boilers. In order to reduce CO2 emissions from coal-fired boilers, this study investigates the co-combustion of pulverized coal and hydrogen in a swirl pulverized coal burner by numerical …
Simulation of Pulverized Coal Combustion …
In this paper, the combustion process of a 350 MW opposite pulverized coal combustion boiler is studied using a combined field test and numerical simulation. Considering the turbulence–radiation …
Influence of Reducing Gas Injection Methods on Pulverized …
Model Validation. The combustion of pulverized coal has been extensively studied by CFD models in the tuyere and raceway of TBF, and the reliability of this …
Direct Numerical Simulation of Pulverized Coal Combustion …
A compressible direct numerical simulation (DNS) solver for pulverized coal combustion has been developed and used to study a pulverized coal jet flame with a Reynolds number of 28 284 based on the nozzle diameter. An eighth-order center differential scheme combined with an explicit tenth-order filter is used for spatial …
Energy and Economic Assessment of Oxy-Fuel Combustion …
Oxy-fuel combustion technology replaces air with a mixture of pure O2 and recycled flue gas for coal combustion, which leads to difficulties in the waste heat recovery of flue gas in the boiler tail of coal-fired power plants. This paper proposes a new integration scheme for waste heat recovery of flue gas in coal-fired power plants with …
Reaction behaviors in pulverized coal MILD-oxy combustion …
The IFRF's MILD furnace is used to perform numerical simulations [25], the burner arrangement and domain configuration of which are detailed in Fig. 1.In specific, the highly-preheated oxidizer is entering the furnace by a central secondary air pipe (D sec = 125 mm), while the primary air carrying pulverized coal is supplied through two lateral …
Combustion of pulverised coal (Book) | ETDEWEB
@misc{etde_7339818, title = {Combustion of pulverised coal} author = {Field, M A, Gill, D W, Morgan, B B, and Hawksley, P G.W.} place = {United Kingdom} year = {1967 ...
Experimental and numerical investigation on nitrogen transformation in
Although some related modelling studies can be found, the number of existing experimental studies in this area is very limited. Moreover, there have been very few studies conducted on nitrogen transformation in the POFC of pulverized coal, and in most of these researches, nitrogen transformation in oxy-fuel and air-fired atmospheres was …
Pulverized Coal Combustion Characteristics in Oxy-fuel Atmospheres
To evaluate the combustion performance of pulverized coal, comprehensive combustibility index S was defined as [18], [19] (4.1) S = d w / d t max × d w / d t a v T i g 2 × T b. where (dw/dt) max is the maximum combustion rate and (dw/dt) av is the average weight loss rate. Generally, a higher S value indicates a higher reactivity of …
Fundamentals of pulverised coal combustion
Combustion of coal produces the heat required as well as various solid residues and gaseous pollutants such as ash, SO2 and NOx. During combustion, coal particles …
Fluidized Bed Combustion
Emissions Control Strategies for Power Plants. Bruce G. Miller, in Coal Energy Systems, 2005 Fluidized-Bed Combustion. Fluidized-bed combustion is not an SO 2 control technology per se; however, this combustion technology does offer the capability to control SO 2 emissions during the combustion process rather than after combustion where …