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Optimised combustion of biomass and biomass-waste fuels in stoker-fired boilers

Objective



The thermal utilisation of biomass such as wood fuels, energy coppices, refuse derived fuel (RDF) and packaging derived fuel (PDF) is a challenging task tackling Europe's greenhouse gas emission and waste dumping problems. One of the well known technical processes is the grate fired combustion in a range of 100 kWth to about 20 MWth already applied in several thousand units in Europe.

However, experience from operation has shown that these installations do not comply with strengthened emission control regulations, in particular NOX, CO, volatile organic compounds (VOC) and soot. This is due to insufficient combustion behaviours which also result in low fuel conversion efficiency. Within this project, emissions of NOX, CO, hydrocarbons, dioxins and furans of grate fired boilers will be measured and technologies for a further reduction applied without secondary measures i.e. catalysts, etc. In order to improve fuel utilisation and reduce the negative effect on the environment, a Controlled Multi Air-Staging Technique is proposed for this project because this technique has been proven in previous experiments to be beneficial for both the above mentioned problem areas.

In a study emission behaviour, by-product management and operational problems of existing grate fired systems will be summarised as a data base for further evaluation and optimisation. On a pilot scale of 200 kWth the Controlled Multi Air-Staging Technique for further NOX and CO reduction will be developed. This new technique will then be tested in a 0.5 MWth grate fired furnace under real industrial and operational conditions to show the limits and restrictions. Based on verification of the combustion process in a laboratory scale reactor a numerical combustion bed model will be developed and coupled with a CFD-code. The developed model will be used as a tool to optimise the operation and emission conditions for large scale application by the industrial partners in the project who will disseminate their experience within the European market including our Eastern neighbour countries.

In order to fulfil the goals in the case of waste co-combustion the industrial partners will demonstrate on full scale the application and the environmental acceptability of this innovative process and its competitiveness with regard to other well known processes.

Coordinator

UNIVERSITAET STUTTGART
Address
Pfaffenwaldring 23
70569 Stuttgart
Germany

Participants (6)

CENTRO DE INVESTIGACIONES ENERGETICAS, MEDIAMBIENTALES Y TECNOLOGICAS
Spain
Address
22,Avenida Complutense 22
28040 Madrid
Fortum Power and Heat Oy
Finland
Address
Rajatorpantie 8
01019 Vantaa
Gauss Heizung Sanitaer GmbH
Germany
Address
22,Lohmühlenweg
72213 Altensteig
Sermet Oy
Finland
Address
12,Teollisuustie
74700 Kiuruvesi
TPS TERMISKA PROCESSER AB
Sweden
Address
Studsvik
611 82 Nyköping
Technical Research Centre of Finland
Finland
Address
1,Koivurannantie
40101 Jyväskylä