Comparative Analysis of Models of the Combustion Process of Coal Dust in a Turbulent Flow of a Torch of a Charcoal Boiler

This article provides an overview of existing turbulence models. The scheme of combustion of pulverized coal fuel, the construction of a pulverized coal boiler unit and the process of burning coal in the furnace of a boiler unit BKZ-420-140 are considered. We analyzed the existing turbulence models and selected the most optimal mathematical model to study the combustion process of pulverized coal fuel in order to increase the efficiency of the CHPP.

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Numerical simulation of flow and combustion process in the tangentially fired furnace of a 200 MW pulverized coal boiler

Fuel and Energy Abstracts ◽

10.1016/s0140-6701(03)82058-1 ◽

2003 ◽

Vol 44 (3) ◽

pp. 189

Keyword(s):

Numerical Simulation ◽

Combustion Process ◽

Pulverized Coal ◽

Pulverized Coal Boiler ◽

Coal Boiler

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Measurement of O2 in the Combustion Chamber of Apulverized Coal Boiler

Acta Polytechnica ◽

10.14311/1544 ◽

2012 ◽

Vol 52 (3) ◽

Author(s):

Břetislav Janeba ◽

Michal Kolovratník ◽

Ondřej Bartoš

Keyword(s):

Combustion Chamber ◽

Flue Gas ◽

Combustion Process ◽

Pulverized Coal ◽

Or Management ◽

Pulverized Coal Boiler ◽

O2 Concentration ◽

Coal Boiler ◽

The Individual ◽

Lambda Probe

Operational measurements of the O2 concentration in the combustion chamber of a pulverized coal boiler are not yet common practice. Operators are generally satisfied with measuring the O2 concentration in the second pass of the boiler, usually behind the economizer, where a flue gas sample is extracted for analysis in a classical analyzer. A disadvantage of this approach is that there is a very weak relation between the measured value and the condition in specific locations in the fireplace, e.g. the function of the individual burners and the combustion process as a whole. A new extractionline was developed for measuring the O2 concentration in the combustion chamber. A planar lambda probe is used in this approach. The extraction line is designed to get outputs that can be used directly for diagnosis or management of the combustion in the boiler.

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Effect of Slot Wall Jet on Combustion Process in a 660 MW Opposed Wall Fired Pulverized Coal Boiler

International Journal of Chemical Reactor Engineering ◽

10.1515/ijcre-2018-0110 ◽

2019 ◽

Vol 17 (4) ◽

Cited By ~ 11

Author(s):

Yong Zhang ◽

Yao Fang ◽

Baosheng Jin ◽

Youwei Zhang ◽

Chunlei Zhou ◽

...

Keyword(s):

Combustion Process ◽

Side Wall ◽

Pulverized Coal ◽

Operating Conditions ◽

Gas Velocity ◽

Pulverized Coal Boiler ◽

Inclination Angles ◽

Secondary Air ◽

Coal Boiler ◽

Optimized Conditions

Abstract Numerical investigations of an anti-corrosion design and the combustion process (original conditions and optimal conditions) were conducted for a 660 MW opposed wall fired boiler. In order to solve high-temperature corrosion of the side wall, a scheme was proposed: slotting in the side wall and introducing air (closing-to-wall air) from the secondary air. The effect of anti-corrosion was disclosed in detail by varying the structures of slotting, gas velocities from nozzles and jet inclination angles. The temperature and NOx distribution in the furnace at optimized conditions were compared with those at the original operating conditions. Simulation results showed that the structures of the slot and gas velocities from the nozzles had a marked effect on anti-corrosion of the side wall. When the gas velocity was 4 m/s, an inclination angle of the gas velocity was not conducive to anti-corrosion of the side wall. When the gas velocity increased at the middle and bottom of the side wall, the anti-corrosion effect increased significantly. When the optimal scheme was adopted, the corrosion area of the side wall decreased obviously, but the furnace temperature and the NOx emission increased slightly. The detailed results of this work promote a full understanding of closing-to-wall air and could help to reduce the corrosive area in pulverized-coal furnaces or boilers.

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DIAGNOSTIC OF THE COMBUSTION PROCESS USING THE ANALYSIS OF CHANGES IN FLAME LUMINOSITY

Informatyka Automatyka Pomiary w Gospodarce i Ochronie Środowiska ◽

10.35784/iapgos.227 ◽

2019 ◽

Vol 9 (3) ◽

pp. 70-73

Author(s):

Żaklin Grądz ◽

Joanna Styczeń

Keyword(s):

Multiresolution Analysis ◽

Combustion Process ◽

Measurement Data ◽

Pulverized Coal ◽

Statistical Tools ◽

Process Diagnostics ◽

Coal Fuel ◽

Pulverized Coal Fuel

Monitoring of the combustion process is carried out in order to ensure its efficiency and stability. Selected aspects of the combustion process diagnostics using the analysis of changes in flame luminosity for two configurations: 100% pulverized coal fuel and a mixture of 80% coal and 20% biomass were presented in the article. The analysis of measurement data was conducted using selected statistical tools and a multiresolution analysis of signals.

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