Granular material loading
Unlike the traditional method of granular material loading, i.e. loading into the vessel under the gravity using a hose, which does not provide uniform distribution of particles across a cross-sectional area, we use the “catalyst dense loading method” and our patented loader device.
Our loader device has a function for changing the discharge of granular materials to achieve minimized scuffing and minimized deterioration of bulk solid particles by permitting free motion of particles inside the dense bed. Also the loader device has a function for changing the area of spread of particles by changing basket’s rotational rate. The loader device is simple, reliable, easy to operate, unified for various kinds of bulk solids, and highly efficient in forming uniform distribution of bulk solids across a cross-sectional area of the vessel.
The loader device was used for loading a catalyst into apparatuses of the ethylene plant’s hydrogenation process line and for loading an adsorbent into the ethylene treatment unit of the low pressure polyethylene production line at the Kazanorgsintez chemical plant (Kazan, Russia).
We will calculate our service fees on bulk solids loading after receiving all requirement specifications through e-mail.
Description of the loader device
Bulk solids loading is accomplished through using a patented in-house loader device designed to provide uniform loading (Fig.1).
The loader device is composed of storage capacitor having a branch pipe for feeding granular materials, pneumatic drive installed on storage capacitor’s cover, system for controlling (stopping) granular material feeding comprising punched bottom of storage capacitor and a movable gate valve consisting of a grid containing conic elements installed on it, and, finally, a distribution device (“basket”) comprising four annular disks equipped with spades. Overall dimensions of the loader device: diameter – 450 mm, height – 600 mm.
Granular material (adsorbent or catalyst) enters a storage capacitor, fills its volume and after the gate valve is opened, granular material starts scattering over a surface of the pneumatic drive that is used for revolving annular disks around a shaft. Centrifugal force values differ from one annular disk to another; the difference forms distribution of granular material particles across a cross-sectional area that resembles a rain shower.
The loader device is installed into the vessel using a robe fixated to the ends of chain haulages (Fig.3). The other end of the rob is installed outside of the vessel on a hoist allowing to perform lowering, lifting and aligning of height of installation of the loader device over a layer of granular materials (or over vessel’s bottom). Height of installation of the loader device over a layer of granular materials depends on diameter of the vessel and usually makes up 0.6-1.5 m. The loader device is positioned in the vessel using distance rods with rollers. Granular materials are loaded into the loader device through a feeder (Fig. 2) containing a set of conic tubes fixed to each other using chains.
The upper operating platform contains intermediate hopper of capacity 1-1.5 m3 for receiving granular materials. Intermediate hopper has a gate valve and a fastener system for fastening a feeder; if necessary, a roller block can be installed on intermediate hopper for centering the loader device. Intermediate hopper is filled with materials poured down from transport hoppers lifted to the height by hoisting machines. To avoid overturning, strainers are used to fixate intermediate hopper to the operating platform. During the loading action, presence of people in the vessel is not permitted. All operations on routine maintenance of the loader device are performed from the platform holding the intermediate hopper. In need of performing surveys and other operations during loading, the gate valve of intermediate hopper must be off whereas the drive of the loader device must be on.
Dust formed during motion of bulk solids is removed from the vessel using a fan.