Basics of Boiler and HRSG Design by Brad Buecker

By Brad Buecker

A great primer for strength plant pros who've to put on many hats and wish a realistic rationalization of the layout and uncomplicated 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 could rather be thought of a dry topic. No different e-book explains the basics of boilers and HRSGs with out going into technical depths.

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The low-combustion temperatures in a CFB also prevent slagging. Ash fusion temperatures of most coals are typically above 2,000°F (1,093°C) even in a reducing atmosphere. This is at least 300°F (166°C) above the top temperature in the fluidized bed. Fouling of superheaters and convective pass structures can still be a problem, as furnace temperatures are still high enough for sodium to form the usual vaporous oxide (see chapter 3). A principal advantage of CFB units centers around fuel residence time.

Published by Babcock & Wilcox, a McDermott Company) Boiler designs This section begins with a quick look at natural gas-fired package boilers and then progresses through utility boiler design from small to large. Figure 1-13 shows the very common D-type package boiler design. Firing is from the front of the boiler. The waterwall tubes surround the sides and back of the combustion chamber. This is a two-drum boiler with a separate set of steam generating tubes Figs. 1-14 and 1-15: General circuitry of an A–type boiler (left) and an O-type boiler (right) Buecker Ch1 9/11/02 11:50 AM Page 17 Fossil Fired Boilers–Conventional Designs | Fig.

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.

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