Chunkwood fuel feeding and combustion experiments in small-scale boilers to provide design suggestions for chunkwood friendly boiler construction
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| Název: | Chunkwood fuel feeding and combustion experiments in small-scale boilers to provide design suggestions for chunkwood friendly boiler construction |
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| Autoři: | Persson, Tomas, Rönnbäck, Marie, Mattsson, Jan Erik, Danielsson, Bengt-Olof, Ryde, Daniel |
| Zdroj: | Sustainable Energy Technologies and Assessments. 71 |
| Témata: | Bins, Fuel storage, Screw conveyors, Wood fuels, Wood products, Block chips, Chunkwood, Combustion boilers, Fuel combustion, Fuel feeding, Fuel feeding system, Renewables, Screw feeders, Small scale, Small scale combustion boiler, biomass, carbon monoxide, combustion, emission control, energy use, fuelwood, Stokers |
| Popis: | Chunkwood fuels have a particle size larger than normal chips which enables good drying and storage properties and are therefore appreciated by small-scale users. However, small-scale boilers optimized for chunkwood are not commercially available and the research question is if modern wood chip stokers, selected for having a robust fuel feeding system could feed and combust the fuel. Chunkwood fuel feeding, and combustion tests are performed in a 27-kW and a 240-kW wood chip stoker. Both boilers fulfill Ecodesign emission requirements for carbon monoxide (CO) at nominal load, but further optimization is required to fulfil requirements for dust. Partial load combustion needs to be further studied. There were problems with high stress on the fuel feeding system in both stokers, traced to when excessively large fuel pieces passed the outlet of the fuel bin and when fuel discs became trapped between the auger screw and the lid of the conveyor. Suggestions to solve the fuel feeding problems includes redesign of the fuel bin auger screw to cut oversized pieces, alternatively use of previously developed prototype conveyors that worked. Further studies are required to optimize the fuel feeding system and the combustion performance including a solution for partial load operation. |
| Popis souboru: | electronic |
| Přístupová URL adresa: | https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-76152 https://doi.org/10.1016/j.seta.2024.103986 |
| Databáze: | SwePub |
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Nájsť tento článok vo Web of Science | Abstrakt: | Chunkwood fuels have a particle size larger than normal chips which enables good drying and storage properties and are therefore appreciated by small-scale users. However, small-scale boilers optimized for chunkwood are not commercially available and the research question is if modern wood chip stokers, selected for having a robust fuel feeding system could feed and combust the fuel. Chunkwood fuel feeding, and combustion tests are performed in a 27-kW and a 240-kW wood chip stoker. Both boilers fulfill Ecodesign emission requirements for carbon monoxide (CO) at nominal load, but further optimization is required to fulfil requirements for dust. Partial load combustion needs to be further studied. There were problems with high stress on the fuel feeding system in both stokers, traced to when excessively large fuel pieces passed the outlet of the fuel bin and when fuel discs became trapped between the auger screw and the lid of the conveyor. Suggestions to solve the fuel feeding problems includes redesign of the fuel bin auger screw to cut oversized pieces, alternatively use of previously developed prototype conveyors that worked. Further studies are required to optimize the fuel feeding system and the combustion performance including a solution for partial load operation. |
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| ISSN: | 22131388 22131396 |
| DOI: | 10.1016/j.seta.2024.103986 |