STUDYING THE EFFECTS OF USING DIFFERENT KINDS OF FUEL  ON THE EFFICIENCY OF STEAM BOILER

	STUDYING THE EFFECTS OF USING DIFFERENT KINDS OF FUEL ON THE EFFICIENCY OF STEAM BOILER
AL-TAQANI
Article 1, Volume 22, Issue 3, 2009, Pages 0-0
Abstract
The study of the effects of different kinds of fuel on the efficiency of steam boiler was carried out in order to improve the combustion process of boiler by study of some operation variables, combustion effect , mixing percent of the air and fuel on the boiler efficiency. It is observed that the air/fuel ratio has a main controller on the combustion process. Wherein the best performance for the combustion about( ),So the best combustion process about ( ), It was found that the best excess air is (5-10%).It is one of the important factors affecting combustion process and boiler efficiency. The employment of excess air to reduces efficiency of the boiler and causes rejection of great amounts of hot flue gases. It is observed that the use of (20%) excess air more than theoretical necessary air for fuel combustion reduces the efficiency about (1-4.5%).As the reduction of boiler efficiency at small amount of air entering to a furnace comes back to combustion because of necessary air lack. It was also found that the value of reduction is more than excess air for this case. It was about (10-50%) of boiler efficiency. On the other hand, another operation variable has secondary effect on the combustion process and boiler efficiency. Also the kind of fuel has impression on the fuel contents such as high hydrogen percent converted to vapor which produced in flue gases that causes energy loss and efficiency reduction.

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