| 摘要 |
<p>Described is a method as well as a plant for preheating particulate or pulverulent material such as cement raw meal or similar material in a cyclon e preheater (1), comprising at least two cyclone stages, each comprising a ris er duct (2a, 2b, 2c, 2d) and a cyclone (1a, 1b, 1c, 1d). The method is peculiar in that a portion of the material which is fed to at least one cyclone stage is introduced to the first part of the riser duct, viewed in the direction o f travel of the exhaust gases, and is heated from a temperature of maximum 450 ~C to a temperature of at least 550 ~C, and in that the remaining material which is fed to the same cyclone stage is introduced into the last part of t he said riser duct. As a result, there will be a reduction in the amount of SO2 which is discharged from the cement plant preheater as emission, without a simultaneous increase in energy consumption.</p> |
