B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/348, 23/420
B01D 53/34 (2006.01) B01D 53/50 (2006.01)
Patent
CA 1133235
- 31 - REMOVAL OF SULFUR AND THE LIKE FROM GAS Abstract of the Disclosure Emission gas to be scrubbed of sulfur dioxide or the like has turbulent lengthwise flow through an elongated mixing vessel. At a mixing zone in the vessel, near where said gas enters it, finely comminuted lime (Blaine Number preferably 6000 before calcining) is fed into the gas and carried out of the vessel with the gas to a cyclone separator. From the cyclone the gas passes to a baghouse at which residual lime is removed from it and it is released. A minor portion of the lime separated at the cyclone is sent to waste; most is returned to the mixing zone for recycling. Make-up lime is fed to the mixing zone from a suspension calcining furnace, reaching the mixing zone while still heated. To maintain 650°C to 750°C at the mixing zone, recycled lime may be reheated in passing from the cyclone to that zone. The total of recycled and fresh lime fed to the mixing zone is at least nine times the quantity required for stoichiometric reaction with pollutant in the emission gas and can be 40 or more times that quantity.
343696
Allis-Chalmers Corporation
Swabey Ogilvy Renault
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