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By Colin Frayne
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Extra resources for Boiler water treatment : principles and practice Vol 1 & 2
Tubes and tube plates may be variously constructed of carbon steel, lowalloy steels, or special alloy steels, with each design provid ing for particular required levels of thermal and mechanical stress and corrosion resistance. The overall boiler plant system may have a life expectancy in excess of 50 to 60 years, although individual components may need to be replaced periodically during this period. Boilers perform two primary functions: 1. They generate steam by heat transfer. 2. They separate this steam from circulating boiler water.
1 ELECTRIC BOILERS Electric storage hot water heaters and instantaneous water heaters are used for simple domestic applications and are not considered in this text. For many smaller HW and lower pressure steam generation appli cations (including bakery ovens and proofers, jacketed kettles, fish pots and other cooking equipment, wineries, breweries, textiles, laundries, phosphatizing processes, humidification, steam baths, clean rooms, and pharmaceuticals), electric boilers offer significant advantages over fos silfuel boilers and are often the product of choice.
Typically, a FW tank temperature of 180 to 190 °F (8288 °C) is preferred and can be achieved by the direct application of "live steam" (from a LP steam supply or from a flash steam recovery sys tem) through a perforated sparge pipe or by indirect heating via steam, gases of combustion, or electricalresistance heaters. 4% fuel saving. Tanks should, of course, be properly designed and lagged. 6 °C) rise typically results in a 1 % fuel saving. 4 Boiler Loading Efficiency Boilers are designed to operate within a range of firing levels; the greater this range (turndown ratio), the more flexible they are in oper ation.