B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/358
B01D 53/34 (2006.01) B01D 53/30 (2006.01) B01D 53/68 (2006.01) G05D 21/02 (2006.01)
Patent
CA 1298960
METHOD FOR REMOVING HYDROGEN CHLORIDE FROM EXHAUST GAS DISCHARGED FROM INCINERATOR ABSTRACT OF THE DISCLOSURE A method for removing hydrogen chloride from an exhaust gas discharged from an incinerator, which comprises the steps of: causing hydrogen chloride contained in an exhaust gas discharged from an incinerator to react with slaked lime in slurry into basic calcium chloride; detecting a concentration (y) of hydrogen chloride remain- ing in the exhaust gas after the reaction with slaked lime; determining a deviation (.DELTA.y) of the thus detected concent- ration (y) of hydrogen chloride from a predetermined target concentration (yo) thereof; determining a corrected deviation (.DELTA.y') by adding to the above-mentioned deviation (.DELTA.y) a correction value (.DELTA.y1) calculated in accordance with the following formulae: .DELTA.y1 = -Gp(S)(1-e-LS)U ......... (1) .DELTA.y' = .DELTA.y + .DELTA.y1 .......... (2) where, Gp(S) : a transfer function representing a first order lag, e-LS : a transfer function representing a dead time, and U : a target amount of supply of slaked lime, - 1 - which renders the deviation (.DELTA.y) zero; determining a target amount of supply (U) of slaked lime, which renders the thus determined corrected deviation (.DELTA.y') zero; and adjusting an amount of supply of slaked lime so that the amount of supply of slaked lime agrees with the thus determined target amount of supply (U) of slaked lime; thereby removing hydrogen chloride from the exhaust gas discharged from the incinerator. - 2 -
568753
Ase Hajime
Fujii Satoshi
Nara Hisao
Sakai Masao
Macrae & Co.
Nippon Kokan Kabushiki Kaisha
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