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Optimering av kalktillsatser i Borås Energis rökgasreningssystem
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Förbrännings- och aerosolteknik.
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Förbrännings- och aerosolteknik.
2006 (Swedish)Report (Refereed)
Abstract [sv]

Today, waste incineration is a hot topic. Since 2002 there are regulations against land filling combustible materials. From 2005 the same applies for organic waste. Due to the new regulations, icineration with energy recovery has increased and will continue to grow. Waste incineration gerenates a lot of residues. The foucs of this report is the common pollutants Sulphur dioxide and Hydrochloric acid. To separate these from the Flue gas an adsorbent, often hydrated lime, is used. Huge amount of the adsorbent has to be added to the process to gain sufficient cleaning. A previous study has showed that the adsorbent conversion efficiency is very low, only around 25%. The objective of this project is to optimize the adsorption process of HCl and SO2 to gain a reduction of lime consumption and to make the process more efficient. This will be achieved by changing selected parameters of the process at Borås Flue gas cleaning plant. Reduced limestone consumption has double benefits; decreased purchase cost and decreased cost due to the land filling fee for filter ash is reduced. The project included the following assignments; a literature study, an interview to gather experience from plant operators, collection and evaluation of plant data. Plant data indicates that the plant operation has changed due to the modification of the process parameters. Theory has shown that humidity plays a key role in the process. High humidity makes the lime more active and reduces the consumption. High humidity can be achieved by lowering the flue gas temperature or adding water to the fuel. These two cases and a combination of them have been tested at the plant. The result has showed a reduction in consumption of lime. There are a lot of cost reductions to gain. A plant with the same size as Borås will with a 10% decrease in lime consumption reduce the cost with appr. 300.000 SEK. Plant data has indicated that a 25% decrease in lime consumption is achievable. This will reduce Borås Energys' cost with appr. 720.000 SEK. Sorbacal is a new product developed for flue gas cleaning. It is estimated to be 2 or 2 times more efficient than regular lime. There are siginificant economical benefits to gain if the product can withstand the expectations. Estimatons shows that a cost reduction as high as 1.2 MSEK is achievable. The products efficiency is shortly going to be tested at Borås Energy flue gas cleaning plant.

Place, publisher, year, edition, pages
2006.
Series
SP Arbetsrapporter, 2006:13
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-3712Local ID: 7182OAI: oai:DiVA.org:ri-3712DiVA: diva2:961336
Note
Examensarbete 20 poäng Högskolan i BoråsAvailable from: 2016-09-07 Created: 2016-09-07Bibliographically approved

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Förbrännings- och aerosolteknik
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