Processes of heat and mass transfer in furnace chambers with combustion of thermochemically activated fuel

Мессерле, В. Е.; Аскарова, А.С.; Bolegenova, S.А.; Šafařík, Pavel; Maksimov, V. Yu.; Nugymanova, Aizhan

doi:10.1134/s0869864319060143

Cited by 7 publications

(6 citation statements)

References 14 publications

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“…At the same time, there is almost complete release of volatile substances and partial combustion and gasification of fuel carbon (Ekibastuz coal). As a result, the resulting fuel mixture, consisting of combustible gas and coke residue, ignites when mixed with secondary air and burns steadily without highly reactive reserve fuel (fuel oil or natural gas) being used to stabilize the pulverized-coal flame, even in a cold firebox [12][13][14][15][16].…”

Section: Resultsmentioning

confidence: 99%

Using Plasma Activation to Optimize the Combustion Process and Minimize Harmful Emissions

et al. 2021

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The possibility of introducing plasma ignition of fuel in combustion chambers of power boilers was investigated by using 3D computer modeling methods. Computational experiments were carried out on operating boilers, and a comparison of the characteristics of the combustion process for traditional fuel combustion and its thermochemical variant was carried out. Plasma technology allows the concentration of carbon and nitrogen oxides at the outlet of the furnace to be reduced. The results obtained showed the efficiency of thermochemical plasma activation of fuel and the possibility of its application in real heat and power facilities to optimize combustion processes and minimize harmful emissions.

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Section: Resultsmentioning

confidence: 99%

Using Plasma Activation to Optimize the Combustion Process and Minimize Harmful Emissions

et al. 2021

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“…A steam boiler with a capacity of 75 t/h burns high-ash Karaganda coal (ash content 35.10%), is equipped with four pulverized coal burners, two burners from the front and from the rear in one tier. A more detailed description of the boiler combustion chamber, mathematical model, solution method, application package is given in the following works [19][20][21][22][23][24][25][26]. The general view of the combustion chamber of the BKZ-75 boiler (figure 1a) and the arrangement of burners and injectors for the implementation of the technology of two-stage fuel combustion (figure 1b) is shown in figure 1a [27][28].…”

Section: Description Of the Combustion Chamber For Conducting Computamentioning

confidence: 99%

Use of Two-Stage Fuel Combustion Technology to Minimize Hazardous Emissions at Kazakhstan TPP

Аскарова¹,

Šafařík²,

Bolegenova³

et al. 2021

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Studies have been carried out using numerical modeling methods to determine the effect of the introduction of a two-stage combustion technology (OFA technology) of high-ash Karaganda coal on the characteristics of combustion processes: aerodynamics of flows, temperature and concentration (COх, NOх) fields throughout the entire volume of the combustion chamber of the BKZ-75 boiler at Shakhtinskaya TPP and at the outlet from it. Comparison with the basic regime of combustion of pulverized coal fuel, when there is no air supply through additional injectors (OFA = 0%). To implement the technology of two-stage combustion, various regimes of additional air supply through injectors were chosen: OFA equals 0% (basic version, conventional combustion), 5%, 10%, 15%, 18%, 20%, 25% and 30% of total air volume required for fuel combustion. A comparative analysis of the main characteristics of the heat and mass transfer process in the combustion chamber for the investigated modes is carried out. It is shown that an increase in the volume of additional air supplied through the injectors up to 18% leads to a decrease in the concentration of nitrogen oxide NO by 25% in comparison with traditional combustion. A further increase in the volume of additional air leads to a deterioration in these indicators. The results obtained will make it possible to optimize the combustion of low-grade fuel in the combustion chamber of the BKZ-75 boiler, increase the efficiency of fuel burnout, reduce harmful emissions and introduce a two-stage combustion technology at other coal-fired TPPs.

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“…The boiler BKZ-75 of the Shakhtinskaya THP plant uses the dust of the Karaganda coal grade KR-200 with ash-content of 35.1 %, volatile yield of 22 %, humidity of 10.6 % and gross calorific value of 18.55 MJ/kg. The boiler is equipped with four burners installed, two burners from the front and from the rear in one tier at a height of z = 4 m, and four OFA injectors at a height of z = 9.4 m. A more detailed description of the boiler's combustion chamber, mathematical model, solution method and the application software package is given in the following works [40][41][42][43][44][45][46][47][48]. General view of the combustion chamber of the BKZ-75 boiler, the layout of the burners and OFA injectors are shown in Figure 1.…”

Section: Object Of Studymentioning

confidence: 99%

Minimization of Toxic Emissions During Burning Low-Grade Fuel at Kazakhstan Thermal Power Plant

et al. 2020

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This paper presents new results of computational experiments on the implementation of Overfire Air (OFA) technologies using an example of a combustion chamber of the BKZ-75 boiler of the Shakhtinskaya power plant (Shakhtinsk, Kazakhstan) burning high-ash Karaganda coal. The effect of mass air flow through special nozzles located above the burner level on the flow aerodynamics, temperature fields, concentration fields of carbon monoxide CO and nitrogen NO over the entire volume of the combustion chamber was studied. The studied characteristics were compared for various percentages of supplying additional air through OFA injectors: OFA is 0% (basic version), 10% and 18 %. It was shown that the installation of OFA injectors leads to a change in the field of the total velocity vector, temperature, and concentrations of carbon oxides and nitrogen. An increase in the percentage of air supplied through OFA injectors to 18% leads to a decrease in the concentrations of carbon monoxide CO by about 36% and nitrogen oxide NO by 25% compared with the base case. The obtained results will optimize the process of burning pulverized fuel in the combustion chamber of the BKZ-75 boiler, increase the efficiency of fuel burnout, reduce harmful emissions and introduce OFAtechnology at other coal-burning thermal power plants.

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Processes of heat and mass transfer in furnace chambers with combustion of thermochemically activated fuel

Cited by 7 publications

References 14 publications

Using Plasma Activation to Optimize the Combustion Process and Minimize Harmful Emissions

Using Plasma Activation to Optimize the Combustion Process and Minimize Harmful Emissions

Use of Two-Stage Fuel Combustion Technology to Minimize Hazardous Emissions at Kazakhstan TPP

Minimization of Toxic Emissions During Burning Low-Grade Fuel at Kazakhstan Thermal Power Plant

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