| 摘要 |
The invention relates to a method and apparatus for scrubbing emission gases to remove sulfur, titanium oxide and/or phosphorous oxides.
<??>As shown in the single figure of the drawings, the emission gas to be scrubbed is introduced into zone (107) of an elongated mixing vessel (5) through opening (6) whereby turbulence is imparted to the gas.
<??>At the mixing zone (107) in the vessel, near where said gas enters it, finely comminuted lime (Blaine Number preferably 6000 before calcining) is fed into the gas at opening (7) and carried out of the vessel with the gas to a cyclone separator (10). From the separator (10) the gas passes to a baghouse (31) at which residual lime is removed from it and it is released.
<??>A minor portion of the lime separated at the cyclone (10) is sent to waste at (34). Most of the separated lime from cyclone (10) is returned (via 16, 15, 17) to the mixing zone (107) for recycling. Make-up lime is fed to the mixing zone (107) from a suspension calcining furnace (12), reaching the mixing zone (107) while still heated. To maintain a temperature of 650 DEG C to 750 DEG C at the mixing zone (107), recycled lime may be reheated (in reheater 15) in passing from the cyclone (10) to the zone (107). The total of recycled and fresh lime fed to the mixing zone (107) 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. |
