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Syngas as a Reburning Fuel for Natural Gas Combustion

100%
Wilk M., Magdziarz A., Zajemska M., Kuźnia M.
Chemical and Process Engineering
|
2014
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vol. 35
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issue 2
181-190
EN
The paper aims to confirm the syngas application as a reburning fuel to reduce e.g. NO emission during natural gas combustion. The main aim of this modelling work was to predict pollutants generated in the exhaust gases and to indicate the influence of the syngas on the natural gas combustion process. The effect of residence time of fuel-air mixture was also been performed. Calculations were made with CHEMIKN-PRO for reburning process using syngas. The boundary conditions of the reburning process were based on experimental investigations. The addition of 5, 10, 15 and 19% of reburning fuel into natural gas combustion was studied. The effects of 0.001 to 10 s of residence time and the addition of 5, 10, and 15% of syngas on combustion products were determined. The performed numerical tests confirmed that co-combustion of the natural gas with syngas (obtained from sewage sludge gasification) in the reburning process is an efficient method of NOx reduction by c.a. 50%. Syngas produced from sewage sludge can be utilised as a reburning fuel.
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Syngas as a Reburning Fuel for Natural Gas Combustion

86%
Wilk M., Magdziarz A., Zajemska M., Kuźnia M.
Chemical and Process Engineering
|
2014
|
issue 2
3
Content available remote

Nitrogen Oxides Emission Reduction using Sewage Sludge Gasification Gas Reburning Process / Obniżenie Emisji Tlenków Azotu Przy Użyciu Procesu Reburningu Gazem Ze Zgazowania Osadów Ściekowych

72%
Werle S.
Ecological Chemistry and Engineering S
|
2015
|
vol. 22
|
issue 1
83-94
EN
Nitrogen oxides can be formed in various combustion systems. Strategies for the control of NOx emissions in hard coal boilers include the primary (during the combustion) and secondary measures (after combustion). Reburning is the one of the most attractive techniques for reducing NOx emissions. In the last several years, reburning technology has been widely studied but almost only in power engineering big load boilers. Nevertheless, NOx emission is an issue that needs to be considered for small capacity boilers as nitrogen oxides resulting from the combustion of any fossil fuels contribute to the formation of acid rain and photochemical smog, which are significant causes of air pollution. Poland is among the largest coal producing country in Europe. Due to this fact, coal fired boilers are very popular in power engineering and also in the municipal sector. Simultaneously, Poland is characterized by the lack of sewage sludge thermal treatment installation. Gasification is considered as a one of the most perspective method of thermal utilization any carbon-containing material. Syngas, which is the main product of gasification, can be used as a supplemental fuel to reduce the consumption of main fuel in boilers, and it has the potential to reduce NOx emissions. The paper proposes to link those two Polish features so the aim of the work is an experimental investigation of the reburning process of sewage sludge gasification gas in a small capacity domestic coal-fired boiler. The results obtained show how the addition of the reburning fuel influences on NOx reduction efficiency
PL
Tlenki azotu mogą powstawać w wielu systemach spalania. Strategia ograniczania emisji tlenków azotu w kotłach węglowych obejmuje metody pierwotne (w trakcie spalania) oraz metody wtórne (po spalaniu). Reburning jest jedną z najbardziej atrakcyjnych metod ograniczania emisji tlenków azotu. W ostatnich latach technologia ta była przedmiotem wielu badań, ale głównie w kotłach energetycznych dużej mocy. Niemniej jednak, emisja tlenków azot dotyczy także kotłów mniejszych, gdyż stanowi ona istotne źródło powstawania kwaśnych deszczów i smogu. Polska należy do grupy krajów europejskich, gdzie węgla wydobywa się (i zużywa) dużo. Z tego powodu kotły węglowe są bardzo popularnymi jednostkami wytwórczymi. Jednocześnie Polska charakteryzuje się brakiem instalacji do termicznego zagospodarowania osadów ściekowych. Zgazowanie jest wymieniane jako jedna z najbardziej perspektywicznych metod przetwarzania substancji zawierającej węgiel, a produkowany w tym procesie gaz może być używany jako paliwo dodatkowe potencjalnie obniżające emisję tlenków azotu. W pracy zaprezentowano techniczne możliwość połączenia tych dwóch typowych dla Polski cech. Celem pracy jest zatem eksperymentalna analiza możliwości obniżenia emisji tlenków azotu z procesu spalania węgla w kotle małej mocy przy zastosowaniu gazu ze zgazowania osadów ściekowych. Wyniki pokazują, jak dodatek paliwa gazowego wpływa na efektywność redukcji NOx
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