By Brad Buecker
An exceptional primer for energy plant execs who've to put on many hats and wish a pragmatic clarification of the layout and simple operation of traditional steam producing boilers and HRSGs with no need to struggle through technical fabric. Buecker makes use of anecdotes and humor to brighten up what may rather be thought of a dry topic. No different booklet explains the basics of boilers and HRSGs with out going into technical depths.
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Additional info for Basics of Boiler and HRSG Design
This allows plant managers to shop around for the most economical coal and change suppliers if necessary. At least one municipal electric utility seriously considered fluidized-bed combustion for a base-load generating unit because the CFB would allow the city to blend wood chips and leaves with the fuel. City ordinances prevent the burning of leaves and tree limbs within city limits, but a CFB would allow the city to derive an energy benefit from this free (transportation and collection labor excluded) biomass.
The obvious advantage of package boilers is that they can be factory assembled and shipped to the job site in one piece. Common steaming rates in package boilers range from a few thousand pounds per hour to 100,000 pounds per hour. For larger applications, particularly at utilities, field-erected units are the norm. Before the proliferation of simple and combined-cycle combustion turbine units, a popular natural gas-fired boiler for utility applications was the El Paso type shown in Figure 1-16.
The burners reside either within the lower combustor or the cyclone return line to the boiler. These bring 9/11/02 11:53 AM Page 37 The “Newer” Technolgies | the boiler temperature up to around 1,000°F (538°C), at which point the combustor has become hot enough for the primary fuel to be introduced. Sand or alumina serves as a starter bed material until enough ash has circulated through the system to establish a natural bed. Limestone for SO2 removal may be added with the coal or blown into the unit at a short distance above the coal feed level.