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Influence of methods of introducing water into the flame on combustion efficiency and nitrogen oxide emissions

Authors: Kolbasenko, O. V.;

Influence of methods of introducing water into the flame on combustion efficiency and nitrogen oxide emissions

Abstract

The paper presents the results of comparative studies of the combustion quality and the values of the nitrogen oxides concentrations during the combustion of fuel oil M40, with the injection of water vapor into its combustion zone and burning water-fuel emulsions with water content W r = 15% and 30%, carried out on an experimental installation. The analysis of the obtained data showed that when burning the aqueous fuel emulsion with W r = 30%, the best combustion quality indicators were obtained, the indicators were estimated from the values of CO, H2 concentrations and the sum (CO + H2) in the combustion chamber zone. An increase in CO, H2 and (CO + H2) concentrations results in a decrease in the level of NOx, NO and NO2 and an increase in the NO2:NO ratio up to 0,33 when burning emulsion with W r = 30%, which leads to a significant increase in the absorption properties of sulfuric acid and a decrease in the intensity of low-temperature sulfuric acid corrosion, which makes it possible the use of condensation low-temperature heating surfaces when burning emulsions based on sulfur fuel oil with W r = 30% and to increase the efficiency of boilers. Comparison of the combustion quality when water vapor is introduced and burning emulsions with W r = 30%, while taking into account the literature data, made it possible for us to assume that a decrease in NOx emissions and an increase in the NO2:NO ratio due to a higher concentration (CO + H2), the appearance of hydrogen atoms with significant restoration properties, improved conditions for thermal decomposition of NOx and an increasing intensity of acoustic vibration due to the sequence of microexplosions of droplets of water-fuel emulsions. Experimental studies have shown that water-fuel emulsions are not just products of mixing hydrocarbon fuel and a chemically inert liquid, but a completely special type of fuel that qualitatively and quantitatively changes the physicochemical processes of combustion

Сравнение процессов горения жидких топлив при разных способах ввода воды в зону горения показали, что с увеличением количества вводимой воды от 2% при сжигании мазута до 30% при сжигании водотопливной эмульсии с водосодержанием W r = 30%, повышается качество горения: увеличивается концентрация СО и Н2 в процессе пирогенетических реакций и снижается концентрация оксидов азота. Повышение качества горения при сжигании эмульсий объясняется тем, что при сжигании эмульсии под действием микровзрывов ее капель увеличиваются концентрации (СО + Н2) и атомов водорода со значительными восстановительными свойствами, улучшаются условия термического разложения оксидов азота и увеличивается интенсивность акустических колебаний

Порівняння процесів горіння рідких палив при різних способах вводу води в зону горіння показали, що зі зростанням кількості води, що вводиться, від 2% при спалюванні мазуту до 30% при спалюванні водопаливної емульсії з водовмісткістю W r = 30%, підвищується якість горіння: зростає концентрація СО и Н2 в процесі пірогенетичних реакцій і знижується концентрація оксидів азоту. Підвищення якості горіння при спалюванні емульсій пояснюється тим, що при спалюванні емульсій під впливом мікровибухів ії крапель збільшуються концентрації (СО + Н2) і атомів водню зі значними відновлювальними якостями, покращуються умови термічного розкладання оксидів азоту і зростає інтенсивність акустичних коливань

Keywords

water in the combustion zone; water-fuel emulsion; microexplosions; restoration properties; thermal decomposition; acoustic vibrations, вода в зоні горіння; водопаливна емульсія; мікровибухи; відновлювальні якості; термічний розклад; акустичне коливання, вода в зоне горения; водотопливная эмульсия; микровзрывы; восстановительные свойства; термическое разложение; акустические колебания

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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