Fouling tendency of ash resulting from burning mixtures of biofuels. Part 1: Deposition rates |
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| Affiliation: | 1. Åbo Akademi Process Chemistry Centre, Combustion and Materials Chemistry, 20500 Åbo, Finland;2. Pulp and Paper Centre, Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200, College St, Toronto, Ont., Canada M5S 3E5;1. Coal Research Centre, Bharat Heavy Electricals Limited, Tiruchirappalli 620014, Tamil Nadu, India;2. Dept. of Chemical Engineering, National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India;1. Department of Automation, Shanghai Jiao Tong University, Shanghai, China;2. Key Laboratory of System Control and Information Processing, Ministry of Education of China, Shanghai, China;1. State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, PR China;2. Institute for Energy and Power Engineering, Zhejiang University of Technology, Chaowang Road 18, Hangzhou 310014, PR China;1. Centre for Environmental and Marine Studies, Department of Environment and Planning, University of Aveiro, 3810-193 Aveiro, Portugal;2. Department of Applied Physics and Electronics, Umeå University, 901 87 Umeå, Sweden;3. Department of Applied Chemistry and Physics, Institute of Environment, Natural Resources and Biodiversity (IMARENABIO), University of León, 24071 León, Spain;1. Faculty of Science and Engineering, Energy Technology, Åbo Akademi University, Rantakatu 2, 65101 Vaasa, Finland;2. Department of Civil, Environmental, Land, Building Engineering and Chemistry (DICATECh), Politecnico di Bari, Via E. Orabona, 4-70125 Bari, Italy;3. ENEA – Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Territorial and Production System Sustainability Department, Piazzale Enrico Fermi, 1-80055 Portici, NA, Italy;4. Department of Energy (DENERG), Politecnico di Torino, Corso Duca degli Abruzzi, 24-10129 Turin, Italy |
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| Abstract: | Specified mixtures of peat with bark and peat with straw were burned in a lab-scale entrained flow reactor that simulates conditions in the superheater region of a conventional biomass-fired boiler. The deposition rates were recorded on an air-cooled probe that was inserted into the reactor at the outlet. For both mixtures, the deposition behaviour followed a non-linear pattern, which suggests that physico-chemical interaction between the types of ash has taken place. Peat seems to act as a cleansing agent in all mixtures with straw, while it acts as a cleansing agent in mixtures with bark only up to a share of 50 wt% bark. Between 50 and 100 wt% bark, it seems that peat adds to the deposition. The results indicate that it is possible to burn up to 30 wt% bark (renewable biofuel and pulp mill waste) and up to 70 wt% straw (renewable biofuel and agricultural waste) in mixtures with peat (CO2-neutral fossil fuel) without encountering increased deposition rates. |
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