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Silo diameters ranging from 10 to 25 m are used based on the same configuration. The material is supplied continuously to the silo either by a bucket elevator or by an air controlled lifting device. The top deck of the silo is provided with all the necessary standard features such as manholes, over- and underpressure valves, and level indicators. The silo bottom is divided into six, eight or ten sections (depending on the silo diameter), each sloping 15 degrees towards their respective outlets at the base of the inverted cone. Each of the sections is fitted with aeration boxes. Two sections at a time are aerated for approximately 5 minutes. The air supply system to each section may include a filter that cleans the air and prevents material from entering if a pipe breaks inside the silo. The air is supplied to the aeration boxes by two rotary blowers at a pressure of up to 0.8 bar. The air is distributed via a pipe system with two-way solenoid valves, one for each silo bottom section. The rotary blowers have noise-reduced blow off pipes that let out the fluidisation air when the pressure reaches a certain level. The extraction outlets at the base of the inverted cone can be cleaned manually by air lances. Each outlet has a manually operated slide gate and a pneumatically regulated cut off gate. From the silo outlets the material proceeds via airslides to the feed tank. The airslides each have a separate fan that only operates while the airslide is in use. The feed tank is aerated by a single rotary blower operating at a pressure of up to 0.8 bar. On the tank top is a dedusting filter, and the tank bottom has one or more pneumatically regulated flow control gates. These gates close quickly (within two seconds) and allow regulating the rate of flow to packers or bulk loading devices.  Types of Silos Tangential silo: The tangential silo was specially developed for the long-term storage of very fine-grained bulk materials - such as cement. All the silo outlets are located in the middle of the silo, beneath the central cone. The discharged material can be conveyed to various packing and loading facilities.  Flat floor silo: For storing free-flowing and fluidisable materials the simplest solution is the flat floor silo. Compared with other types of silo, the flat floor silo - due to its silo floor inclination of only 15 degrees - has the best ratio of storage volume to construction height. Flat floor silos have diameters of up to 16 m. Cone silo: The cone silo is a storage silo with very little mechanical equipment and therefore with minimal operating costs. Aeration units in the outlet zone and a blower are all that is needed to ensure perfect discharge of material. The inclination of the cone is so designed that the stored material slides down in mass flow without needing aeration in the silo.  Multi-compartment silo: When producing composite cements, the individual components are stored in separate silos before they are blended. Combining these silos into one unit presents distinct advantages. The compartments of a multi-compartment silo are thus individual silos with pressure-relieved outlet. |
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