Basics of Boiler and HRSG Design by Brad Buecker

By Brad Buecker

A good primer for energy plant execs who've to put on many hats and want a pragmatic clarification of the layout and easy operation of traditional steam producing boilers and HRSGs with no need to go 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 no going into technical depths.

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Direct flames are not as evident in a CFB as they are in a pulvarized coal or cyclone unit. Rather, the process resembles a swirling sandstorm with an orange glow. Temperature control is very critical with regard to NOx production. During the limestone tests at UNC-CH, the bed temperatures increased by 60°F to 70°F (33°C to 39°C) over the normal averages of 1,640°F (893°C) and 1,650°F (899°C) in Units 6 and 7, respectively. Corresponding NOx emissions on Unit 6 increased by 87% and on Unit 7 increased by 200%.

5/1. The ideal temperature for SO2 removal is 1,550°F, and reactivity can drop off significantly beyond this point. This is one of the major factors that require CFB temperatures to be held below 1,700°F. Primary air to the combustor enters through a distributor plate located at the bottom of the furnace. This ensures an even distribution of flow to the bed. Airflow rates are critical and must be designed to fluidize the bed, but not push excessive material out of the boiler, as heat transfer in the furnace is greatly dependent upon hot particles contacting the tube walls.

Another interesting feature comes in comparing the boiler bank and economizer in “c” and “d,” respectively. It Fig. 1-21: Heat absorption patterns for four pulverized coal boilers (Reproduced with permission from Combustion: Fossil Power, Alstom) Buecker Ch1 9/11/02 11:50 AM Page 23 Fossil Fired Boilers–Conventional Designs | is the author’s experience that boilers at this pressure (and higher) typically have an economizer and not a boiler bank. Regardless, each accounts for about 10% of heat transfer in the steam generator.

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