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

100%

Werle S.

Ecological Chemistry and Engineering S

2015

vol. 22

issue 1

83-94

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

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

Sewage Sludge-To-Energy Management In Eastern Europe: A Polish Perspective

80%

Werle S.

Ecological Chemistry and Engineering S

2015

vol. 22

issue 3

459-469

The Sewage Sludge Directive 86/278/EEC was adopted about 30 years ago with a view to encourage sewage sludge reuse in agriculture and to regulate its use. Meanwhile, some EU Member States have adopted stricter standards and management practices than those specified in the Directive. In particular, the majority of Member States has introduced more stringent standards for sludge quality, including stricter limits for most potentially toxic elements, organic contaminants and other elements. In general, untreated sludge is no longer applied and in several Member States it is prohibited. In some cases, stringent standards have resulted in an effective ban on use of sludge in agriculture. Moreover, the implementation of the Urban Wastewater Treatment Directive 91/271/EC should increase EU production of sewage sludge, thus enhancing problems related to sustainable sewage sludge management. Additionally, European legislation prohibits the landfill and water deposits of sewage sludge. The latest trends in the field of sludge management, ie combustion, pyrolysis, gasification and co-combustion, have generated significant scientific interest. This trend is specially strong visible in “new” EU Members countries which have to introduce strong EU Directive in their low system. Here the review the state of knowledge and technology in thermal methods for the utilization of municipal sewage sludge to obtain useful forms of energy such as pyrolysis, gasification, combustion, and co-combustion taking into consideration Poland situation is presented.

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2 Werle S.

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

Sewage Sludge-To-Energy Management In Eastern Europe: A Polish Perspective