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Utvärdering och utveckling av säkerhetssystem mot tillbakabrand i pellets- och flisutrustningar
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Förbrännings- och aerosolteknik.
SP - Sveriges Tekniska Forskningsinstitut / Klimatsimulering (ETks ).
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Förbrännings- och aerosolteknik.
2004 (Swedish)Report (Refereed)
Abstract [sv]

There is always some risk of incident associated with the combustion of solid fuels in automatically stoked boilers or stoves. These incidents are of essentially three types: smoke from the burner back into the boiler room (or back into the living room from pellet stoves), gas explosions in the combustion chamber and back burning in the stoker. There can be a number of reasons for these problems, and in many cases such incidents have not been investigated. The Swedish Building Regulations stipulate that firing equipment shall have adequate safety against fire. They also recommend that stokers/burners should have at least two independent safety systems against back burning. The objective of this project has been to analyse such incidents and to test safety systems for pellet and wood chip burners, in order better to understand how they work. It has also included evaluation of the“fireguard” water sprinkler system. The results from the tests with pellet burners showed that the burners that were tested provided relatively good protection against back burning. However, it was found that it was very important how and where the systems (temperature limiter, water sprinkler etc.) were fitted on the burners in order to ensure correct and effective operation of the safety system. One of the key question was also where to position electronic equipment on the burners in order to ensure that it is not exposed to temperatures higher than those for which it is designed. Over the years, there have been major problems with back burning in older designs of wood chip burners using old technology. The chip burner used in this project was of modern type. The test with simulated back burning showed that the water sprinkler stopped the fire. However, for greater safety the water sprinklers should have included two separate water container. The test with the pellets stove showed that the temperature sensor was of crucial importance for safety against back burning in the stove. Back burn occurred in one of the tests, but only after all the stove’s safety systems had been rendered inoperable. The “Fireguard” water sprinkler system performed well in our tests. However, the position of the temperature sensors, and the integrity of their thermal contact, was of crucial importance for how quickly the sprinklers responded. Another water sprinkler (Syr) showed itself to be very slow to respond when its sensor were in poor thermal contact with the surface of the fuel feed chute. Experience from the tests in this project has shown that it is relatively difficult to simulate back burning in boilers and pellet stoves, despite setting up very favourable conditions for such back burning. Although modern burners and pellet stoves are equipped with all the safety systems that can be expected, several incidents still happen every year. This means that continued analysis of incidents and development of safety systems is essential. The results from this project will be included when SP’s P-marking rules for pellet burners, pellet stoves and chip wood burners are next reviewed

Place, publisher, year, edition, pages
2004.
Series
SP Arbetsrapporter, 2004:09
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-3691Local ID: 2668OAI: oai:DiVA.org:ri-3691DiVA: diva2:961315
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2016-09-26Bibliographically approved

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Förbrännings- och aerosolteknikSP - Sveriges Tekniska Forskningsinstitut / Klimatsimulering (ETks )
Natural Sciences

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CiteExportLink to record
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Citation style
  • apa
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