By Brad Buecker
A great primer for strength plant pros who've to put on many hats and want a pragmatic rationalization of the layout and uncomplicated operation of traditional steam producing boilers and HRSGs with no need to plow 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 no going into technical depths.
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Extra info for Basics of Boiler and HRSG Design
The combustor in and near the fuel zone is lined with refractory, as very abrasive conditions are present in this area • Limestone (sorbent) injected to the combustor or added to the fuel reacts with SO2 and oxygen to produce calcium sulfate (CaSO4), a solid and benign waste product. This removes SO2 directly in the furnace, and eliminates or minimizes the need for backend SO2 control • The combustion temperature is usually maintained at or close to 1,550°F (843°C). The low temperature minimizes NOx formation.
The main feature is the cyclone combustion chamber, of which most cyclone boilers have multiple units. The popularity of the boiler stemmed from good combustion efficiency. Pebble-sized coal is fed into the cyclones with air inlets at various locations, including along the length of the combustion barrel. The air imparts a swirling motion to the coal, hence the cyclone name. The barrels are water-cooled just as in a regular boiler, although the tubes in the barrel are typically around 1” in diameter.
Consider first Figure 2-10, the outline of a traveling grate stoker. Coal is fed at the leading end of the stoker grate. Primary air feed comes from below the grate with some overfire air above the grate for NOx control. The underfire air prevents the grate from overheating. As the grate traverses the furnace, the coal combusts, being reduced to ash by the time it reaches the opposite side of the furnace. A variable underfire airflow pattern is common to provide more air to the coal at the entry point and less as the coal loses combustible material.