Gas separation: processes – With control responsive to sensed condition – Electric or electrostatic field
Patent
1994-11-14
1996-10-22
Chiesa, Richard L.
Gas separation: processes
With control responsive to sensed condition
Electric or electrostatic field
95 58, 96 52, 96 53, 96 74, 110345, 42324306, B03C 3013
Patent
active
055672264
ABSTRACT:
The present invention provides an apparatus and method to improve the performance of a variety of particulate collection devices. Gaseous ammonia is injected by one or more injectors into a waste gas upstream from a particulate collection device. The amount of ammonia injected from each injector is controlled so that the local concentration of ammonia in the waste gas is approximately the same as the corresponding local concentration of sulfur trioxide in the waste gas. The flow of ammonia from each injector is controlled by measuring several local sulfur trioxide concentrations in the waste stream after the ammonia has been injected. The sulfur trioxide can occur naturally or result from injection. By keeping the concentration of ammonia approximately equal to the concentration of sulfur trioxide, ammonia and sulfur trioxide react to form a liquid product. This liquid reaction product coats the surfaces of particles entrained in the gas stream. Once coated, the particles' electrical conductivity is altered so that they are more easily collected by devices employing electrostatic attraction. The liquid coating also causes the particles to agglomerate and these larger agglomerates are easier to collect.
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Gabrielson James E.
Glickert Roger W.
Lookman Aziz A.
Chiesa Richard L.
Cox, Esq. John N.
Schermer, Esq. Leland P.
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