Aho, Martti

Glarborg, Peter

Grell, Morten Nedergaard

Jappe Frandsen, Flemming

Jespersen, Jacob Boll

Wu, Hao

Potassium chloride, KCl, formed from biomass combustion may lead to ash deposition and corrosion problems in boilers. Sulfates are effective additives for converting KCl to the less harmful K2SO4. In the present study, the decomposition of ammonium sulfate, aluminum sulfate and ferric sulfate was studied respectively in a fast-heating rate thermogravimetric analyzer (TGA) for deriving a kinetic model. The yields of SO2 and SO3 from the decomposition were studied in a tube reactor, revealing that the ratio of the SO3/SO2 released varied for different sulfate and for ammonium sulfate the ratio was affected by the decomposition temperature. Based on the experimental data, a model was proposed to simulate the sulfation of KCl by different sulfate addition, and the simulation results were compared with pilot-scale experiments conducted in a bubbling fluidized bed reactor. The simulation results of ammonium sulfate addition and ferric sulfation addition compared favorably with the experimental results. However, the model for aluminum sulfate addition under-predicted significantly the high sulfation degree of KCl observed in the experiments, possibly because of an under-estimation of the decomposition rate of aluminum. Under the boiler conditions of the present work, the simulation results suggested that the desirable temperature for the ferric sulfate injection was around 950-900oC, whereas for ammonium sulfate the preferable injection temperature was below 800oC

Online Research Database In Technology

Modeling the use of sulfate additives for potassium chloride destruction in biomasscombustion - DTU Orbit (09/11/2017) Modeling the use of sulfate additives for potassium chloride destruction in biomass combustionPotassium chloride, KCl, formed from biomass combustion may lead to ash deposition and corrosion problems in boilers.Sulfates are effective additives for converting KCl to the less harmful K2SO4. In the present study, the decomposition ofammonium sulfate, aluminum sulfate and ferric sulfate was studied respectively in a fast-heating rate thermogravimetricanalyzer (TGA) for deriving a kinetic model. The yields of SO2 and SO3 from the decomposition were studied in a tubereactor, revealing that the ratio of the SO3/SO2 released varied for different sulfate and for ammonium sulfate the ratiowas affected by the decomposition temperature. Based on the experimental data, a model was proposed to simulate thesulfation of KCl by different sulfate addition, and the simulation results were compared with pilot-scale experimentsconducted in a bubbling fluidized bed reactor. The simulation results of ammonium sulfate addition and ferric sulfationaddition compared favorably with the experimental results. However, the model for aluminum sulfate addition under-predicted significantly the high sulfation degree of KCl observed in the experiments, possibly because of an under-estimation of the decomposition rate of aluminum. Under the boiler conditions of the present work, the simulation resultssuggested that the desirable temperature for the ferric sulfate injection was around 950-900oC, whereas for ammoniumsulfate the preferable injection temperature was below 800oC. General informationState: PublishedOrganisations: Department of Chemical and Biochemical Engineering, CHEC Research Centre, Technical University ofDenmark, VTT - Technical Research Centre of FinlandAuthors: Wu, H. (Intern), Grell, M. N. (Intern), Jespersen, J. B. (Ekstern), Aho, M. (Ekstern), Jappe Frandsen, F. (Intern),Glarborg, P. (Intern)Number of pages: 6Publication date: 2013 Host publication informationTitle of host publication: Proceedings of the European Biomass Conference and ExhibitionMain Research Area: Technical/natural sciencesConference: EU BC&E 21st European Biomass Conference and Exhibition, Copenhagen, Denmark, 03/06/2013 -03/06/2013Additives, Alkali, Biomass, Combustion, Modeling, AshesElectronic versions: 1302 - Modeling the use of sulfate additives for potassium chloride destruction in biomass combustion.pdf Source: dtuSource-ID: u::8622Publication: Research - peer-review › Article in proceedings – Annual report year: 2013 

Modeling the use of sulfate additives for potassium chloride destruction in biomass combustion

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Modeling the use of sulfate additives for potassium chloride destruction in biomass combustion

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