Combustion – Combustion bursts or flare-ups in pulses or serial pattern
Patent
1989-02-23
1990-07-10
Dority, Carroll B.
Combustion
Combustion bursts or flare-ups in pulses or serial pattern
122 24, 431 4, F23C 1104
Patent
active
049404059
ABSTRACT:
Pulse combustors and associated air mixers are used to process fuel and calcium based sorbent outside of a furnace or boiler. liquid or solid fuel is rapidly volatilized in the air mixer of the first pulse combustor, producing high gaseous fuel content and a highly reactive char or soot. This material is then injected into the upper part of the furnace, above the conventional burners, to create a fuel rich zone which reduces previously formed nitrogen oxide (NOx) pollutants. The calcium based sorbent is injected into a second pulse combustor, located higher in the furnace. The sorbent is flash calcined in the air mixer of the pulse combustor yielding a high surface area sorbent. This material is then injected into the furnace above the first pulse combustor to reduce previously formed sulfur oxide (SO2) pollutants. In addition, the stream from this combustor and air mixer provides the air needed to completely burn out the coal fuel from the first pulse combustor. Besides a combined NOx and SO2 control, the system can be configured to only reduce either NOx or SO2.
REFERENCES:
patent: 2748753 (1956-06-01), Sarrazin et al.
patent: 4368677 (1983-01-01), Kline
patent: 4671056 (1987-06-01), Genz et al.
patent: 4779545 (1988-10-01), Breen
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