Abstract:
A description is given of an inclined feed shaft «(1) for feeding particulate material to a mill (2). The feed shaft (1) is peculiar in that it is configured for rotation about its longitudinal axis. It is hereby obtained that any incipient formation of coatings on the wall of the shaft will continuously be cleaned off and dislodged from the wall by the larger descending material particles in the feed material so that the feed shaft will be of a self-cleaning type. This is due to the fact that during the rotation of the shaft (1) the entire circumference of the shaft (1) will intermittently be located at the bottom of the cross-sectional profile of the shaft (1), and thereby be cleaned off by the descending material. As a result, coatings continuously being formed during the rotation of the shaft on those parts of the shaft wall not located at the bottom will continuously be cleaned off when these parts pass the bottom of the cross-sectional profile of the shaft (1).
Abstract:
Described is an apparatus (7) for removing volatile components, such as chloride, alkali and sulphur, from exhaust gases in a cement manufacturing plant, which plant comprises a preheater (1) for preheating cement raw materials, a kiln (5) for burning cement clinker, and a transition zone(3)between the preheater (1) and the kiln (5), said apparatus (7) comprising a cooled condensation body (9)having an outer surface temperature which is lower than the condensation temperature of the volatile components and being placed into the exhaust gases at a location where the temperature of the exhaust gases exceeds the mentioned condensation temperature so that volatile components when brought into contact with the condensation body (9) are cooled to a level below their condensation temperature and are thereby condensed and deposited on the condensation body (9).The apparatus is peculiar in that means (11; 14, 16) for cleaning the condensation body (9) is constantly located inside the plant accommodating the exhaust gases to be cleaned. It is hereby obtained that the cleaning procedure of the condensation body may take place inside the plant, thus an airtight compartment may be omitted,and essential without any interruption.
Abstract:
A description is given of an inclined feed shaft «(1) for feeding particulate material to a mill (2). The feed shaft (1) is peculiar in that it is configured for rotation about its longitudinal axis. It is hereby obtained that any incipient formation of coatings on the wall of the shaft will continuously be cleaned off and dislodged from the wall by the larger descending material particles in the feed material so that the feed shaft will be of a self-cleaning type. This is due to the fact that during the rotation of the shaft (1) the entire circumference of the shaft (1) will intermittently be located at the bottom of the cross-sectional profile of the shaft (1), and thereby be cleaned off by the descending material. As a result, coatings continuously being formed during the rotation of the shaft on those parts of the shaft wall not located at the bottom will continuously be cleaned off when these parts pass the bottom of the cross-sectional profile of the shaft (1).