Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 4

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
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

100%
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
2
Content available remote

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

100%
Werle S.
Ecological Chemistry and Engineering S
|
2015
|
vol. 22
|
issue 3
459-469
EN
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.
3
Content available remote

Estimation of reburning potential of syngas from sewage sludge gasification process

100%
Werle S.
Chemical and Process Engineering
|
2011
|
vol. 32
|
issue 4
411-421
EN
The motivation of this work was to define the reburning potential of sewage sludge gasification gas (syngas). Numerical simulation of co-combustion process of syngas in hard coal-fired boiler has been done. All the calculations were performed using the Chemkin program. Plug-Flow Reactor model was used. The calculations were modelled using GRI-Mech 2.11 mechanism. The highest NO conversions are obtained at the temperature of about 1000-1200 K. The highest reduction efficiency was achieved for the molar flow ratio of syngas equal to 15%. The combustion of hard coal with sewage sludge - derived syngas reduces NO emissions and the amount of coal needed to produce electricity and heat. Advanced reburning, which is a more complicated process gives efficiency of up to 80%. The calculations show that the analyzed syngas can yield better results.
4
Content available remote

Influence of Wastewater Treatment and The Method of Sludge Disposal on the Gasification Process

63%
Werle S., Dudziak M.
Ecological Chemistry and Engineering S
|
2014
|
vol. 21
|
issue 2
255-268
EN
Municipal wastewater treatment results in the production of large quantities of sewage sludge, which requires proper environmentally accepted management before final disposal. Sewage sludge is a by-product of current wastewater treatment technologies. Sewage sludge disposal depends on the sludge treatment methods used in the wastewater treatment plant (anaerobic or aerobic digestion, drying, etc.). Taking into consideration presented given this information, a study concerning the effects of wastewater treatment processes and sewage sludge drying method on the sewage sludge gasification gas parameters was performed. Gasification is a prospective alternative method of sludge thermal treatment. For the purpose of experimental investigations, a laboratory fixed bed gasifier installation was designed and built. Two types of sewage sludge feedstock, SS1 and SS2, were analyzed. Sewage sludge SS1 came from a wastewater treatment plant operating in the mechanical and biological system while sewage sludge SS2 was collected in a mechanical, biological and chemical wastewater treatment plant with simultaneous phosphorus precipitation. The sludge produced at the plants was subject to fermentation and then, after being dehydrated, dried in a cylindrical drier on shelves heated up to 260ºC (sewage sludge SS1) and using hot air at a temperature of 150ºC in a belt drier (sewage SS2). The analysis shows that the sewage sludge properties strongly depend on the wastewater sources and the wastewater treatment processes. The gasification results, presented as a function of the amount of gasification agent, show that the greater oxygen content of SS1 caused a reduction in the reaction temperature. Paradoxically, this effect caused an increase in the quantity of combustible components in the gas. As expected, increasing the air flow rate caused a decrease in the heating value of the gas produced. A higher amount of oxidizer increases the amounts of noncombustible species and the volumetric fraction of nitrogen, thus reducing the heating value of the obtained gas. The higher hydrogen content in SS1 affects the gasification gas composition. As a result, combustible components are the majority of the syngas.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.