Optimization of the Solid Fuel Combustion Process in Combustion Chambers in Order to Reduce Harmful Emissions

Šafařík, Pavel; Аскарова, А.С.; Bolegenova, S.А.; Максимов, В. А.; Nugymanova, Aizhan

doi:10.32014/2019.2518-1726.71

Cited by 4 publications

(5 citation statements)

References 13 publications

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“…In this regard, it becomes urgent to develop and introduce combustion technologies with minimal emissions of fly ash, carbon oxides and nitrogen at Kazakhstan coal-fired TPPs. Therefore, the main task of the domestic heat power industry is to create technologies for burning high-ash Kazakh coal, with the help of which it is possible to control the main processes of the formation of harmful dust and gas emissions and control the level of their formation [1][2][3][4][5].…”

Section: Thematic Scope: Publication Of Priority Research In the Fielmentioning

confidence: 99%

“…Нұғыманова 1 , С.А. Болегенова 2 1 Казахский национальный университет имени аль-Фараби, Алматы, Казахстан; 2 Научно-исследовательский институт экспериментальной и теоретической физики, Алматы, Казахстан; 3 Чешский технический университет в Праге, Прага, Чешская Республика ИСПОЛЬЗОВАНИЕ ТЕХНОЛОГИИ ДВУХСТУПЕНЧАТОГО СЖИГАНИЯ ТОПЛИВА ДЛЯ МИНИМИЗАЦИИ ВРЕДНЫХ ВЫБРОСОВ НА КАЗАХСТАНСКИХ ТЭЦ Аннотация. Одним из основных источников загрязнения окружающей среды вредными пылегазовыми выбросами остаются электростанции, работающие на твердом топливе.…”

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

Аскарова¹,

Šafařík²,

Bolegenova³

et al. 2021

News of NAS RK. SPh-M

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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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Section: Thematic Scope: Publication Of Priority Research In the Fielmentioning

confidence: 99%

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

Аскарова¹,

Šafařík²,

Bolegenova³

et al. 2021

News of NAS RK. SPh-M

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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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“…The OFA method, or as it is also called the "step-by-step method of burning fuel", includes the supply of the entire volume of combustion air (primary and secondary) in two stages: 70-90% of the air is supplied to the burners, and the rest is supplied to the combustion device over the burner "sharp blast". By mixing fuel with a controlled air flow in the burner, a relatively low-temperature, oxygen-depleted and fuel-rich combustion zone is created in the lower part of the combustion burner, which helps to reduce the formation of NO x from the nitrogen contained in the fuel (fuel NO x ) [10].…”

Section: Introductionmentioning

confidence: 99%

Research of Characteristics of Heat and Mass Transfer at the Introduction of Technology of Steps Fuel Burning on the BKZ-75 Boiler of the Shakhtinskaya TPP

Šafařík¹,

Bolegenova²,

Tuyakbaev³

et al. 2020

OF THE NATIONAL ACADEMY OFSCIENCES OF THE REPUBLIC OF KAZAKHSTA

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Optimization of the Solid Fuel Combustion Process in Combustion Chambers in Order to Reduce Harmful Emissions

Cited by 4 publications

References 13 publications

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

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

Research of Characteristics of Heat and Mass Transfer at the Introduction of Technology of Steps Fuel Burning on the BKZ-75 Boiler of the Shakhtinskaya TPP

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