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When Castle Cement decided to use meat and bone meal (MBM) as a fuel for the cement kilns at its Ketton and Padeswood works, it needed to construct new storage and handling systems for this fatty and difficult-to-handle material.
Portasilo conducted a detailed analysis of samples of MBM to establish its bulk density, particle size, flow characteristics and other properties, in order to devise the most effective storage and handling system.
On each site, Portasilo installed land-based blower systems that used chilled air to blow the MBM from delivery tankers into 400m3-capacity silos. The chilled air was necessary to prevent the material heating up and leaking fat, which would make it even more cohesive and difficult to handle.
The 7.5-metre diameter silos were delivered in sections and assembled on site to create the finished vessels. These silos were flat bottomed and fitted with rotating screw discharges, which effectively scrape the material from the floor of the silo and discharge it into ‘loss-in-weight’ feeders. These were fitted with load cells to accurately measure the weight of material being transferred into the kilns. The MBM is discharged into lean-phase pneumatic conveying systems that directly feed the material into the kilns for burning, again using chilled air for the conveying. All silos and conveying systems were fitted with appropriate explosion-protection systems to ensure full compliance with ATEX regulations.
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