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3-D Numerical Study of CFB 110 MW: Fluidization in Furnace and Cyclone with Load and Air Combustion Variations

Circulating Fluidized Bed (CFB) boiler has advantages when uses low rank coal compared to Pulverized Boiler. It will be less operational cost but has greater risk in degradation because of sands material inside the process. Air combustion between primary and secondary air is one important parameter...

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Bibliographic Details
Published in:Majalah IPTEK 2019-08, Vol.30 (2), p.24-27
Main Authors: Wirahadi, Ari, Mirmanto, Heru
Format: Article
Language:English
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Summary:Circulating Fluidized Bed (CFB) boiler has advantages when uses low rank coal compared to Pulverized Boiler. It will be less operational cost but has greater risk in degradation because of sands material inside the process. Air combustion between primary and secondary air is one important parameter that influent fluidization of CFB. Numerical simulation of commercial CFD was used with Eulerian multiphase model implemented to analyze sand volume of fraction, air and sand velocity including pressure distribution around furnace. It used 55%-45% air combustion ratio of primary and secondary air as reference when boiler operated at 63% and 100% based on operation performance of CFB. Then it simulated with additional variation of air combustion ratio 50%-50%. Simulation of 110% load was added using all air combustion variations. The simulation showed that fluidization with air combustion ratio 50%-50% and 55%-45% executed well when operated at 63%. Meanwhile, fluidization 100% and 110% with all those air combustion ratios would cause a great number of sands entered inlet cyclone and higher sands as well air velocities
ISSN:0853-4098
2088-2033