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Combustion Blower

Date Added: November 09, 2012 11:59:55 PM
Author: Oleg Cthetchel
Category: Business & Economy: Industrial Equipment

The amount of air required for theoretically perfect combustion is based on the portion of the combustible substances carbon (C), hydrogen (H2), oxygen (O2), and sulfur (S) contained in fuel. These are the only combustibles found in common fuels. In practice, the combustion system designer should determine the actual air volume requirements and the excess air margin based on an analysis of the fuel in question. The fan selection for the application should be capable of meeting both conditions with good efficiency, economy, and stability. Whenever possible, the actual condition should represent the most efficient point of operation for the fan selected for the application. The combustion of coal and most fuel oils will release sulfur fumes into the flue gas. If a wet scrubbing or cleaning apparatus is used, water vapor will combine with the sulfur to form sulfuric acid. This can place severe constraints on the fan types available to handle this highly corrosive gas stream. For this very reason, flue-gas-desulfurization equipment is designed into the pollution control systems of many combustion processes. Another alternative to reduce the potential for sulfuric acid in the exhaust system is to mix lime or crushed limestone in a fluidized bed combustion process so the lime will neutralize the sulfur and stabilize the pH of the exhaust gases. Fans used in combustion processes, whether forced or induced draft, should be capable of meeting the following minimum requirements: 1) The fan pressure curves should be stable throughout the entire operating range of the system. Certain fans, such as most radials, pressure blowers, and airfoil fns, are stable from wide-open to completely closed-off to offer the broadest possible control range. 2) The fan and all its components should be designed to meet even the test block condition without passing through the first critical frequency of the rotating parts. A common specification calls for the fan shaft’s first critical speed to be 125% of the maximum operating speed. 3) The entire fan assembly should be rugged to withstand industrial service. Catalogs or drawings should contain complete material specifications. 4) Whenever possible the entire fan, motor, and drive assembly should be factory assembled, aligned, and test run to ensure smooth operation. The fan manufacturer should be capable of test running complete assemblies. Induced-draft fans have further special requirements: 5) Where fan airstream temperature exceeds 300°F., the fan should include a shaft cooler and the bearing base should be separated from the fan housing. 6) The fan should be selected to handle the maximum particulate loading. Radial, radial-tip, and backwardly inclined designs in a variety of alloys are suitable to handle a wide range of contaminated airstreams. 7) Fans handling particulate-laden airstreams should be furnished with shaft seals to protect the inboard bearings. Ceramic-felt shaft seals usually provide the best protection in these applications. 8) Fans fao dirty airstreams should also be furnished with a cleanout door and a drain to facilitate periodic cleaning. Various quick-opening, bolted, and raised, bolted cleanout doors and drain connections are generally available. For additional information please refer to http://www.buffaloblower.com/news/index.html. Oleg Tchetchel Canadian Process Design Engineer Buffalo Fan Co. buffalofan@buffalofan.com http://buffalofan.com/inquiry.html http://www.buffalofan.com/faninquiry.html
 
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