Paul Wurth S.a.

Ben Muller

Louis Schmit

Pierre Mahowald

An installation for distribution of granular or powder material via pneumatic transport comprising at least one dispensing hopper () for temporary storage of said granular or powder material, the dispensing hopper being suited to being, alternately, pressurized for emptying the dispensing hopper and depressurized to permit filling thereof, and a device for depressurizing said dispensing hopper. The depressurizing device comprises a depressurizing duct () connected to said dispensing hopper, a bag filter (), having a maximum operating flow rate, connected to the depressurizing duct, and flow control means () for controlling the flow rate in said depressurizing duct through the bag filter. The bag filter () is suited to operating under pressure, and the flow control means () are located on the depressurizing duct () downstream of the bag filter () and are arranged to provide a flow rate which is at most equal to the maximum flow rate of the bag filter. Application in particular to an installation for injecting coal into a blast furnace.

Installation for distributing pulverulent substance by pneumatic transportation, comprising a device for depressurizing a pressurized reservoir in which said substance is stored

A process for pressurizing bulk material in an apparatus for pressurizing bulk material in a hopper; wherein the hopper is configured as a lock hopper containing a bulk material, wherein the apparatus comprises a source of pressurized gas, lines to convey the pressurized gas from the source of pressurized gas to one or more inlets of the lock hopper, a valve arrangement arranged in the lines, wherein the process is characterized in that said valve arrangement comprises at least two valves arranged in parallel, each valve being connected to a downstream Laval tuyere, and in that said valves are controlled to open in an operating sequence to provide pressurizing gas with an adjusted gas flow rate to the lock hopper.

Enhanced pressurising of bulk material in lock hoppers

A process for pressurizing bulk material in a hopper; wherein the hopper is configured as a lock hopper () containing a bulk material, a source of pressurized gas, lines () to convey the pressurized gas from the source to one or more inlets () of the lock hopper, a valve arranged in the lines, wherein the opening position of said valve () is controlled to provide pressurizing gas to the lock hopper at a preset constant gas volume flow rate.

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Strassen, Luxembourg

Ben Muller