Abstract
The aim of the work is computer simulation of the formation of nitrogen oxides in the furnace of the boiler TPP 312 with the swirl of the primary air in the boiler burners. The organization of the vortex flow allows reducing the generation of nitrogen oxides due to the formation of a return flow, which ballasts the combustion zone by oxidation products. The limitation of this technique is the reduction of the combustion temperature which can lead to underburning.
 The objective of the study is to determine the formation of nitrogen oxides based on computer simulation of the gas dynamics of the firing space of the boiler TPP 312 DTEK Ladyzhyn TES when swirling streams of air are used in the burner channels.
 Efficient combustion of fuel, in particular solid, is ensured by three factors: mixing of the fuel and the oxidizing agent, residence time in the temperature zone necessary for the combustion of fuel particles and temperature. The selection of the parameter is under pressure from requirements operating in opposite directions. On the one hand, a higher temperature contributes to better fuel burning, but, on the other hand, the formation of nitrogen oxides increases at a higher temperature.
 Analysis of the data on the quality of coal that comes to the station made it possible to derive the averaged characteristics of coal that were used to improve the combustion model of the software package.
 Conclusions
 In the presence of swirling flow, the maximum temperature is 108 K lower than in the case of a direct-flow burner, which causes a 5% reduction in the generation of nitrogen oxides. Centrifugal flows created a rarefaction zone at the burner axis and the reaction products begin to heat the fuel mixture in the burner itself. The surface area of the beginning of combustion during the application of twisting reduces by 30%.
 The results of the study showed that the twisting of the primary air does not lead to a significant reduction of nitrogen oxides.
Highlights
Представлені результати комп’ютерного моделювання спалювання газового вугілля в котлі ТПП 312 ДТЕК Ладижинська ТЕС
The results of the study showed that the swirling of the primary air could reduce the formation of nitrogen oxides by up to 12%
The results of the study showed that the twisting of the primary air does not lead to a significant reduction of nitrogen oxides
Summary
Представлені результати комп’ютерного моделювання спалювання газового вугілля в котлі ТПП 312 ДТЕК Ладижинська ТЕС. Досліджено вплив завихрення потоку первинного повітря на процес утворення оксидів азоту. Результати проведеного дослідження показали, що завихрення первинного повітря дозволяє знизити утворення оксидів азоту на величину до 12%. Результаты проведенного исследования показали, что завихрение первичного воздуха позволяет снизить образование оксидов азота на величину до 12%. The influence of the vortex of the primary air stream on the formation of nitrogen oxides is studied. The results of the study showed that the swirling of the primary air could reduce the formation of nitrogen oxides by up to 12%. U – компонент швидкості перпендикулярний до осьової; w – осьова швидкість; d_NO – відносна зміна витрати оксидів азоту; Нижні індекси o – зовнішній, базовий; i – внутрішній; max – максимальний; 1, 2 – номери каналу вторинного повітря; c – канал первинного повітря
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