96/05208 Catalytic abatement of emissions from small-scale combustion of wood. A comparison of the catalytic effect in model and real flue gases

• Publisher: Elsevier Science
• Year: 1996
• Weight: 192 KB
• Volume: 37
• Category: Article
• ISSN: 0140-6701
• DOI: 10.1016/s0140-6701(96)90204-0

✦ Synopsis

Heat transfer characteristics in a small-scale fluidized bed boiler were studied using lignite and corn cob as fuels. Depending on air velocity, the heat transfer rates from bed to water membrane wall and from hot flue gas to convective tube bank were in the ranges 75-55% and 25-45% of the total heat absorbed by the boiler, respectively. At designed capacity, the heat transfer flux based on bed cross sectional area and on water membrane wall area were about 0.45 and 0.15 MW m.2, respectively. Under the conditions studied, it was found that the overall heat transfer coefficient between bed and water membrane wall was 100-300 Wm" K", whereas the between flue gas and convective tube bank was lo-30 Wm'* K.'. The study of heat transfer to a horizontal tube immersed in the bed as well as placed in the freeboard region were also studied.