Accueil > VALORISATION > Rеvuе des Enеrgies Renouvеlablеs > Numéros Spéciaux > 11 èmes JITH > Towards the Design of an Ultra Low NOx Combustor for Biomass Derived LCV Gas

Towards the Design of an Ultra Low NOx Combustor for Biomass Derived LCV Gas

B. Adouane1, G. Witteveen2, W. de Jong1, Jos van Buijtenen1

1Delft University of Technology, Section Thermal Power Engineering, Mekelweg 2, 2628 CD Delft, NL. Fax +31.15.278.2460. Email : b.adouane@wbmt.tudelft.nl 2Stationsstraat 41, 6584 AS Molenhoek, NL.

Abstract

Fuel bound nitrogen (FBN), (mainly ammonia NH3) contained in biomass derived LCV (Low Calorific Value) gas is one of the major problems related to the combustion of such gases ; this is due to the high conversion ratio of this nitrogen to NOx during the combustion process. Within Thermal Power Engineering Section of the TUDelft, a group of researchers is busy with reducing NOx emission to the lowest and acceptable levels. A 30% conversion of NH3 to NO was already achieved within a modified Alstom combustor and the so-called TUD combustor designed within the section [Hoppesteyn 1999, Adouane et. al. 2001]. In this paper, we present the first experiments with a Winnox combustor designed for Low NOx emission. These experiments are in the framework of a project funded by Novem (A Dutch Governmental Agency for Energy and Environment), and in partnership with three industrial companies (Winnox Combustion Systems, HoSt, and Geveke Motoren). Natural gas doped with ammonia was the fuel used in all described experiments. In the second phase of this project it is planned to use a synthetic LCV gas from a mixing station simulating the real LCV gas from biomass gasification. The main goal of this project is to achieve ultra low conversion of fuel nitrogen into NOx during the combustion of LCV gas in a newly designed combustor. The aim is to achieve this goal without using catalyst reduction or scrubbing but with only design and combustion process optimization. The experiments described in this paper are part of the first experiments planned in the beginning of this project in order to determine the key parameters controlling the conversion of fuel nitrogen to NOx. These parameters will be used later in the design of the "final" version of the combustor for Low NOx emission from biomass derived LCV gas combustion. This combustor is intended to push the limits further and to achieve a conversion ratio of ammonia to NOx of approximately 12%, with combustion efficiency ( combustion) higher than 98%.. The results of the experiments in terms of ammonia to NOx conversion ratio and NOx and CO emissions are presented in this paper.

Key words

NOx, biomass, combustion, LCV gas

1500. Towards the Design of an Ultra Low NOx Combustor for Biomass Derived LCV Gas
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