Paul Wurth S.a.

Other

Sidmar N.v.

Paul Wirth S.a.

Louis Schmit

Leon Ulveling

Ben Muller

Emile Lonardi

Pierre H Mailliet

Edouard Legille

Marc Solvi

Jeannot Loutsch

Romain Frieden

Georges Stamatakis

Guy Junk

Klaus Schott

Yvon Kroemmer

Ernest Faber

Pierre Mahowald

Raymond Mack

Karl Langner

Heli DeLanghe

Junk Guy

A drying hopper for drying granular material includes a hopper casing defining a plenum chamber for granular material, and an upper part and a bottom part. The hopper also includes a material inlet for the granular material arranged in the upper part; a material outlet port at the bottom part; a component for introducing hot drying gas into the hopper casing; and a gas outlet arranged in the upper part. The component for introducing hot drying gas includes gas pipes arranged to extend substantially vertically in the upper part, each gas pipe having a gas outlet port at its lower end and being connected at its upper end to an annular gas duct having a gas inlet for receiving a flow of drying gas, the gas pipes being distributed on the annular gas duct.

Drying hopper as well as grinding and drying plant comprising such

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 method for producing a comminuted dry material from a coarse material, the method including: (a) providing a heated drying gas from a drying gas source; (b) providing the coarse material in a storage bin; (c) feeding the coarse material and the heated drying gas into a comminuting equipment; (d) comminuting and drying the coarse material within the comminuting equipment to obtain a comminuted dry material; (e) collecting a mixture of drying gas and comminuted dry material from the comminuting equipment and feeding the mixture to a separator to separate the comminuted dry material from the drying gas; and (f) recycling at least part of the drying gas from step (e) as a preconditioning gas and feeding the preconditioning gas into a lower part of the storage bin to precondition the coarse material.

Grinding and drying plant

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.

Pressurising of bulk material in lock hoppers

Method for producing pulverized coal, the method comprising the steps of heating a drying gas, preferably an inert gas, in a hot gas generator () to a predefined temperature; feeding the heated drying gas into a pulverizer (); introducing raw coal into the pulverizer (), the pulverizer () grinding the raw coal to pulverized coal; collecting a mixture of drying gas and pulverized coal from the pulverizer () and feeding the mixture to a filter (), the filter () separating the dried pulverized coal from the drying gas; and collecting the dried pulverized coal for further use and feeding part of the drying gas from the filter to a recirculation line () for returning at least part of the drying gas to the hot gas generator (). According to an important aspect of the present invention, the method comprises the further step of controlling an exit temperature of the mixture of drying gas and pulverized coal exiting the pulverizer () by controlling a volume of water injected into the heated drying gas before feeding it into the pulverizer ().

Method for producing pulverized coal

The invention relates to a method for injecting reducing agents into a shaft furnace in which the reducing agent is transported within a pneumatic delivery stream to the shaft furnace according to the flowing steps; a) dividing the delivery stream into a number of partial streams, b) transferring the individual partial streams through a heating unit, and c) heating the reducing agent within the individual partial streams inside of the heating device. A device for carrying out the inventive method comprises, for example, a delivery line in order to pneumatically deliver the reducing agent to the shaft furnace, and a number of heat exchange pipes which are integrated in the delivery line using a parallel connection, said connection relating to flow techniques, such that the pneumatic delivery stream is divided into a number of partial streams. The inventive device also comprises a heating unit for transmitting heat energy to the individual partial streams.

Method and device for injecting reducing agents in a shaft furnace

A device in which a mixture of steam and contaminated air is first of all channelled into an upward stream and that the mixture subsequently flows as a downward stream in a vessel maintained at reduced pressure. The device further includes an arrangement for spraying an alkaline aqueous solution into the downward stream of the mixture of steam and contaminated air. The decontaminated uncondensed gases are thereby removed from the vessel by a forced and adjustable stream which creates and maintains a reduced pressure inside the vessel.

Device for the treatment of mixture of steam and air contaminated with

A process for feeding a second stream of pulverulent materials into a pneumatic conveying line carrying a first controllable flow of pulverulent materials is presented. The second stream of pulverulent materials is fed at a controlled rate and the control of the first flow is rendered insensitive to disturbances caused by the feeding of the second stream by directly or indirectly controlling the first flow upstream of the injection point of the second stream.

Process and apparatus for feeding a second stream of pulverulent

The present invention relates to a method for treating powdered coal in a solid-fuel injection installation. Such an installation comprises a powdered coal storage bunker, at least one lock connected to the circuit for pneumatically transporting the coal, at least one filtering screen connected between each lock and the bunker, a pressurized inert-gas source for pressurizing each lock and forming the pneumatically propelled flow of the coal and a circuit for pressure-equalizing and depressurizing each lock through a filter. According to the present invention, the major portion of the inert gas for depressurizing each lock is subjected to a filtering operation before being injected through the bottom of the storage bunker into the mass of coal and being discharged through a filter at the top of the bunker. The residual portion of the inert depressurizing gas is shunted directly towards the top of the storage bunker. The present invention also relates to a device for implementing the method.

Method and device for treating powder coal in a solid-fuel injection

The method consists in forming in a single metering device a pneumatic mixture comprising the powdered substances and the propellent gas, in propelling this mixture through a common main 18 into a distributor 20 in which the mixture is split into secondary currents which are sent to each of the injection points respectively through secondary pipes 22.sub.1, 22.sub.2, . . . 22.sub.n, in determining the flow rate in each of the secondary pipes 22.sub.1, 22.sub.2, . . . 22.sub.n by the tuyere 28.sub.1, 28.sub.2, . . . 28.sub.n flow cross-sections and in influencing the transport conditions in each secondary pipe 22.sub.1, 22.sub.2, . . . 22.sub.n by acting on the pressure P3 downstream from each tuyere 28.sub.1, 28.sub.2, . . . 28.sub.n in order to maintain this pressure at a determined value. The method is aimed more particularly at the injection of powdered coal into a blast furnace.

Method for the pneumatic injection of metered quantities of powdered

A device for shutting off pipelines for the transport of bulk product is disclosed. The device comprises a housing with a circular passage orifice, a closing element mounted pivotably in the housing, and an annular gasket surrounding the said orifice and capable of interacting with the peripheral part of the closing element. The gasket is mounted on a fixed support, and the closing element is displaceable along an axis perpendicular relative to its pivot axis. The device is particularly adapted for pipelines for transport of coal dust.

Device for shutting of pipeline for the transport of bulk product

An apparatus is presented for the pneumatic injection of pulverulent materials into a pressurized vessel, comprising a storage silo, a distribution silo, a series of metering devices for extracting the pulverulent materials from the distribution silo, pneumatic conveying pipes connecting each of the metering devices to the vessel, and also a device for the automatic transfer of the pulverulent material from the storage silo (which is under substantially atmospheric pressure) to the distribution silo in which a pressure higher than that in vessel prevails. An important feature of the present invention is the presence of two intermediate silos each connected via automatic valves, upstream to the storage silo and, downstream, to the distribution silo; and by a pressurizing circuit connecting a source of inert gas under pressure through automatic valves to each of the intermediate silos.

Apparatus for the pneumatic injection of pulverulent materials into a

An apparatus for the processing and scrubbing of contaminated gases i.e., gases entrained with particulate matter, is presented. The apparatus comprises a primary dust removal unit which receives a descending gas pipeline originating from a generator or source of contaminated gases. This primary dust removal unit acts to precipitate the larger solid particles from the contaminated gas via gravity and/or inertia to define semi-scrubbed gas. A plurality of scrubbers are provided within the primary dust removal unit to form the forced scrubbing of the semi-scrubbed gases from the primary unit. Each of these scrubbers contain a series of bag filters which are traversed from bottom to top by the semi-scrubbed gases. The scrubbers also include means for monitoring the temperature of the gases at different points in their passage and means for cooling or heating the gases in order to maintain their temperature within predetermined operational limits.

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Luxembourg, Luxembourg

Louis Schmit