Conveyors: fluid current – With diverse power-driven conveyor – Rotary
Patent
1984-06-11
1986-09-02
Nase, Jeffrey V.
Conveyors: fluid current
With diverse power-driven conveyor
Rotary
406115, 406142, 198518, B65G 5348
Patent
active
046093095
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for the transport of powdered or particulate material from a container, such as a tank of a ship, via an upper opening to a separately disposed delivery location with a transport apparatus which is equipped with a feed head for detachment and feeding of the material to the transport apparatus at a material intake end.
As transport medium of interest can be mentioned powders based on lime, fly ash, flour, gypsum, hydrate of lime, potato flour, coal dust, magnesite concentrate, sodium sulphate, phosphate, PVC powder, soap powder, soda, alumina, cement, and the like.
It is known, for example in connection with the unloading of a tank of a ship, to utilise transport apparatus in the form of a transport pipe with an internal transport screw. By employing a closed transport pipe, problems are avoided with dust depositing of the surroundings, something which otherwise could create distinct environmental problems at the same time as the occurrance of a large wastage of transport material. Several of the afore-mentioned transport materials can in addition create large friction problems, so that a large consumption of power is required in order to lift the transport material upwards from and outwards from the container or the tank. The wear on bearings can be especially large, so that large maintenance expenses are required. However, a large proportion of the need for power consists in overcoming the friction between transport pipe (riser pipe) and transport material and between transport screw and transport material respectively. In addition to the weight loading of the material against the transport screw itself a significant laterally directed force occurs from the transport material towards the transport pipe and towards the transport screw and hence friction.
With the present invention the objective is to reduce the need for power to a significant degree by transporing the material in a fluidised state through a transport pipe more or less vertically upwards by means of an air current. The lifting force for such an air current is the same as in the known solution having a transport screw with an air current but according to the invention the forces of friction are reduced to a minimum.
The process according to the invention is characterised in that the feed means pushes the material laterally inwards into the lower end of an upwardly directed transport pipe just above an upwardly directed air current for fluidising the material gradually as it is pushed into the transport pipe and for transporing the material in the height direction through the transport pipe in a fluidised condition.
By pushing the material from the feed head in a relatively uniform current laterally inwards into the transport pipe an immediate fluidising of the transport material can be obtained by means of the air current from below and directed upwardly as the transport material is gradually discharged inwardly into the transport pipe and the air current can be employed simultaneously to transport (lift) the fluidised material upwardly through the transport pipe.
It is preferred according to the invention that the material at the upper end of the upwardly directed transport pipe is delivered to a further transport pipe or transport conduit extending obliquely downwards which in a manner known per se allows the material to flow in a fluidised condition in the longitudinal direction of the transport pipe.
By emptying the transport material in a fluidised state at the upper end of the transport pipe and delivering the transport material in a fluidised state into a further pipe-shaped transport means extending obliquely downwards, minimal power supply is required in order to transport the transport material further as a "running" medium downwardly through the transport pipe.
An apparatus for carrying out the process according to the invention is characterised in that the lower end of an upwardly directed transport pipe, just above a fluidising cloth having a connected lower supply of compressed air is
REFERENCES:
patent: 1192386 (1916-07-01), Cavacristi
patent: 1193016 (1916-08-01), Heyl
patent: 1193057 (1916-08-01), Quigley
patent: 2602707 (1952-07-01), Garoutte
patent: 3179378 (1965-04-01), Zenz et al.
patent: 3964793 (1976-06-01), Volpeliere
patent: 4467910 (1984-08-01), Siwersson et al.
Bergen Patentkontor
Nase Jeffrey V.
Williams L. E.
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