Material or article handling – Apparatus for moving material between zones having different... – Including screw conveyor
Patent
1994-06-03
1995-11-14
Bucci, David A.
Material or article handling
Apparatus for moving material between zones having different...
Including screw conveyor
100148, 100249, 414786, B01J 302
Patent
active
054661080
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for feeding disintegrated material such as wood chips and the like into a collecting container under pressure, the material being transported in a pulsing flow from a charging bin through an input valve to a cylindrical input chamber, the material being discharged axially from this chamber to the collecting container through an output valve by means of a feeding piston.
BACKGROUND AND SUMMARY OF THE INVENTION
Various feeding devices for grainy or fragmented material are known, the material being fed in for further treatment without any great increase of pressure, or for further treatment under an essentially increased pressure. An example of the first mentioned treatment is feeding fuel into a fludized bed as described in the publication EP-Al-0219686. In this case the fuel is fed in from a charging bin by means of a first plane slide which moves the fuel from the charge bin laterally to a position in front of a cylindrical input slide. Finally, said last mentioned slide feeds the fuel through an opened side gate into the fuel chamber. The fuel is fed into the fuel chamber without any actual overpressure.
In order to feed disintergrated material against a comparatively high pressure for further treatment of the material, as for example gasifying, some form of lock-passing or sluicing is exercised when feeding in. The publication SE-B-456 645 examplifies such an apparatus. In this case the material is supplied for treatment from a charging bin to a first receiving chamber and is removed therefrom, by means of a feed piston or a feed screw, and introduced into the input chamber proper through a valve device. By means of a feeder piston in the input chamber the material is introduced into a following high pressure chamber through a further valve. The two valves cooperate in order to bring about sluicing of the material into the high pressure side. The final feeding into the high pressure chamber takes place by means of said piston. The device is especially directed towards input sluicing of wet bio mass, such as e.g. damp peat having up to 20% dry substance, into a high pressure reactor operating at a pressure of up to 150 bar and a temperature of 350.degree. C. In order to ensure complete discharge of the peat from the actual input chamber (sluice chamber) into the reactor on the high pressure side the feed piston is moved past the closing member of the output valve. This known device operates by in-feed in two steps, namely, a first feeding in from the receiving chamber to the actual input chamber and a following final in-feed step from this chamber against the action of high pressure. Said last mentioned in-feed step is exercised by means of a conventional feed piston.
The present invention is directed in particular towards the in-feed of wood ships and similar comparatively dry compactible material. To this end the possibility is utilized to receive and compact the material in one single operating chamber and to discharge the material therefrom into a collecting container under pressure by means of a single active member in the form of a screw piston moving under programmed control. The in-feed process according to the invention is then characterized by a series of operational steps according to the following:
a) the material is supplied to the input chamber through the opened input valve by means of a feeding piston axially movable in the input chamber, the feeding piston having the form of a screw piston which is located in an axially retracted, receiving position, opposite to the input valve, and which feeds, while rotating in an axially stationary position, the material into the chamber towards the closed output valve,
b) material is formed as a compacted plug in the exit end of the chamber in front of the closed output valve,
c) the input valve is closed and the rotation of the screw piston terminated,
d) the output valve is opened and the material plug formed is pushed, by the screw piston being moved axially, into
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patent: 2228840 (1941-01-01), Mittendorf
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patent: 2696442 (1954-12-01), Allbright
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patent: 3756434 (1973-09-01), Teske
patent: 3934038 (1976-01-01), Kerr
patent: 4119025 (1978-10-01), Brown
Bucci David A.
Fasth Rolf
Vattenfall Energisystem AB
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