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Corresponding Author

El-Sayed, Farouk Mohamed

Subject Area

Mechanical Power Engineering

Article Type

Original Study

Abstract

In Egypt there is abundance of agriculture byproducts and residues that is still provoking environmental problems, in particular, rice straw, Utilizing of biomass for energy production alleviates the growing waste disposal problems and preserves the diminishing conventional fossil fuels. The present work is dedicated to investigate the combustion characteristics of rice straw in a fluidized bed. Rice straw has been prepared as peBets of diameter 12mm and length 10 mm by virtue chopping and compression processes. The rice straw pellets have been burnt in an atmospheric bubbling fluidized furnace of diameter 300 mm and High 3300 mm. The experiments have been carried out under steady state conditions and by means of over-bed fuel feeding system. Experimental results demonstrate that combustion of rice straw in fluidized bed is successful with high efficiency. Post-combustion of volatile over bed is evidence that results in a peak temperature in freeboard. The peak temperature degree and location are sensitive to the operating parameters, especially fluidization velocity and excess air. (CO and NO, level are relatively low ranging from 200 to 330 ppm and 175 to 270 ppm respectively. The obtained results show that at high level in the Studied operating parameters (fluidization velocity. bed height, bed temperature and excess air), NO emission increases with different degrees In Egypt there is abundance of agriculture byproducts and residues that is still provoking environmental problems, in particular, rice straw, Utilizing of biomass for energy production alleviates the growing waste disposal problems and preserves the diminishing conventional fossil fuels. The present work is dedicated to investigate the combustion characteristics of rice straw in a fluidized bed. Rice straw has been prepared as peBets of diameter 12mm and length 10 mm by virtue chopping and compression processes. The rice straw pellets have been burnt in an atmospheric bubbling fluidized furnace of diameter 300 mm and High 3300 mm. The experiments have been carried out under steady state conditions and by means of over-bed fuel feeding system. Experimental results demonstrate that combustion of rice straw in fluidized bed is successful with high efficiency. Post-combustion of volatile over bed is evidence that results in a peak temperature in freeboard. The peak temperature degree and location are sensitive to the operating parameters, especially fluidization velocity and excess air. (CO and NO, level are relatively low ranging from 200 to 330 ppm and 175 to 270 ppm respectively. The obtained results show that at high level in the Studied operating parameters (fluidization velocity. bed height, bed temperature and excess air), NO emission increases with different degrees

Keywords

Combustion; Fluidized Bed; Biomass

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