Control of addition of conditioning agents to flue gas
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United States of America Patent
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Jul 9, 1991
Grant Date -
N/A
app pub date -
May 14, 1990
filing date -
May 14, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Additions of conditioning agents to a particulate-containing flue gas stream are controlled by a controller operating from feedforward and feedback signals received from sensors in the combustion and gas cleanup system, and, optionally, from the power consumption level of the electrostatic precipitator. The flow rates of the conditioning agents, such as sulfur trioxide and ammonia, are thereby balanced to achieve an optimal removal of particulate matter and also sulfur and sulfur compounds from the gas stream before it is exhausted to the atmosphere. A typical feedforward signal is the boiler loading, and typical feedback signals include residual sulfur trioxide and ammonia levels and stack gas opacity.
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