Gas washer and method of operation

B - Operations – Transporting – 01 – D

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53/42, 165/46

B01D 47/10 (2006.01) C21B 7/00 (2006.01) C21B 7/22 (2006.01)

Patent

CA 1103147

ABSTRACT OF THE DISCLOSURE A washer having a controlled-gap scrubber is connected to the gas outlet of a pressure blast furnace and an expansion turbine for the recovery of energy is connected downstream of the controlled-gap washer unit while a bypass is connected across the turbine. The system has operating regions A and B on a diagram in which the gas pressure is plotted along the ordinate and the volume rate of flow of gas from said blast furnace is plotted along the abscissa, the region A being defined between the turbine-insertion and the turbine- operating characteristic curves plotted on the diagram, the region B being defined between the turbine-operating characteristic curve and the corrected blast-furnace or gas-cleaning characteristic curve. The pressure in the blast furnace where the operating point is in region A while the gas tranverses the turbine is controlled by varying the gap width of said control-gap washer unit in response to the pressure. The pressure in said blast furnace when the operating point is in the region B is controlled by varying the cross-section of the bypass valve, with the gap of the washer being controlled in response to the differential pressure thereacross.

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