Introducing screw for biogas plants
AssigneeHugo Vogelsang Maschinenbau GmbH
InventorHugo Vogelsang
Life of this patent
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Abstract
The invention relates to a screw conveyor for introducing organic matter into a biogas digester that is under internal gas pressure. The invention further relates to a biogas plant provided with such a screw conveyor, and to a method for feeding organic solids to such a biogas plant. According to the invention, the plug section has an expansion region in which the passage cross-section between the conveying screw and the screw pipe widens in the conveying direction and a constriction region located downstream from the expansion region, in which the passage cross-section between the conveying screw and the screw pipe is reduced in the conveying direction.
Claims19
A screw conveyor for introducing organic matter into a biogas digester that is under internal gas pressure, said screw conveyor comprising:
- a screw pipe (10) extending in a longitudinal direction and having an inlet opening (30) for organic matter in the region of a first screw pipe end (11) and an outlet opening (40) for the organic matter in the region of a second screw pipe end (12),
- a conveying screw (20) extending in the longitudinal direction and arranged inside the screw pipe and which is rotatably mounted and can be made to rotate by means of a screw conveyor drive (50, 60),
- a digester connector (40) for connecting the outlet opening directly to the biogas digester that is under gas pressure,
- a plug section (80c) in a region between the inlet opening and the outlet opening for compacting the organic matter in order to reduce any passage of gas through the screw conveyor, characterised in that the plug section has an expansion region (23a) in which the passage cross-section between the conveying screw and the screw pipe expands in the conveying direction, and a contraction region (23b) disposed downstream from the expansion region, in which the passage cross-section between the conveying screw and the screw pipe is reduced in the conveying direction.
The screw conveyor according to any one of the preceding claims, characterised in that the passage cross-section changes before the plug section, starting from a first passage cross-section having a cross-sectional geometry characterised by a first ball passage, to a second passage cross-section having a cross-sectional geometry characterised by a second ball passage that is larger than the first ball passage, and changes further to a third passage cross-section having a cross-sectional geometry characterised by a third ball passage which is smaller than the second ball passage, wherein the first and the third ball passages are preferably congruent.
A screw conveyor for introducing organic matter into a biogas digester that is under internal gas pressure, in particular according to any one of the preceding claims, said screw conveyor comprising:
- a screw pipe extending in a longitudinal direction and having an inlet opening for organic matter in the region of a first screw pipe end and an outlet opening for the organic matter in the region of a second screw pipe end,
- a conveying screw extending in the longitudinal direction and arranged inside the screw pipe and which is rotatably mounted and can be made to rotate by means of a screw conveyor drive,
- a digester connector for connecting the outlet opening directly to the biogas digester that is under gas pressure,
- a plug section for compacting the organic matter in order to reduce any passage of gas through the screw conveyor,
- characterised by a separation section disposed upstream from the plug section, comprising a plurality of openings in the screw pipe and a fluid collection apparatus outside the screw pipe.
A screw conveyor for introducing organic matter into a biogas digester that is under internal gas pressure, in particular according to any one of the preceding claims, said screw conveyor comprising:
- a screw pipe extending in a longitudinal direction and having an inlet opening for organic matter in the region of a first screw pipe end and an outlet opening for the organic matter in the region of a second screw pipe end,
- a conveying screw extending in the longitudinal direction and arranged inside the screw pipe and which is rotatably mounted and can be made to rotate by means of a screw conveyor drive,
- a digester connector for connecting the outlet opening directly to the biogas digester that is under gas pressure,
- a plug section for compacting the organic matter in order to reduce any passage of gas through the screw conveyor,
- characterised by a flushing fluid port for feeding a flushing fluid into the passage cross-section between the screw pipe and the conveying screw in the region of the second screw pipe end downstream from the plug section.
The screw conveyor according to any one of claims 7 to 9, characterised in that the conveying screw is rotatably mounted in the region of the second end on a support which is fixed torque-resistantly to the screw pipe and which extends axially into a hollow space in the conveying screw.
A screw conveyor for introducing organic matter into a biogas digester that is under internal gas pressure, in particular according to any one of the preceding claims, said screw conveyor comprising:
- a screw pipe extending in a longitudinal direction and having an inlet opening for organic matter in the region of a first screw pipe end and an outlet opening for the organic matter in the region of a second screw pipe end,
- a conveying screw extending in the longitudinal direction and arranged inside the screw pipe and which is rotatably mounted and can be made to rotate by means of a screw conveyor drive,
- a digester connector for connecting the outlet opening directly to the biogas digester that is under gas pressure,
- a plug section for compacting the organic matter in order to reduce any passage of gas through the screw conveyor,
- characterised by at least one flight which is disposed in the region of the second screw pipe end and which is detachably fixed to the conveying screw.
A screw conveyor for introducing organic matter into a biogas digester that is under internal gas pressure, in particular according to any one of the preceding claims, said screw conveyor comprising:
- a screw pipe extending in a longitudinal direction and having an inlet opening for organic matter in the region of a first screw pipe end and an outlet opening for the organic matter in the region of a second screw pipe end,
- a conveying screw extending in the longitudinal direction and arranged inside the screw pipe and which is rotatably mounted and can be made to rotate by means of a screw conveyor drive,
- a digester connector for connecting the outlet opening directly to the biogas digester that is under gas pressure,
- a plug section for compacting the organic matter in order to reduce any passage of gas through the screw conveyor,
- characterised in that the inner wall of the screw pipe encloses a non-circular inner cross-sectional area.
A screw conveyor, in particular according to any one of the preceding claims, said screw conveyor comprising:
- a screw pipe extending in a longitudinal direction and having an inlet opening and an outlet opening in the region of a second screw pipe end,
- a conveying screw extending in the longitudinal direction and arranged inside the screw pipe and which is rotatably mounted and can be made to rotate by means of a screw conveyor drive,
- characterised in that the inlet opening is designed as a radial opening in the screw pipe and extends across an inlet opening section in the longitudinal direction of the screw pipe, and that in the region of the inlet opening section the conveying screw has a first flighting pitch and a second flighting pitch differing from the first flighting pitch.
A biogas plant, comprising a digester which can be gas-tightly sealed and which has a solid matter feed opening in a gas discharge port, characterised by a screw conveyor according to any one of the preceding claims, the outlet opening of which is connected directly to the solid matter feed opening or to a pipeline that is under internal digester pressure and which leads to the solid matter feed opening of the digester.
A method for feeding organic solids into a digester that is under internal pressure, said method comprising the steps of:
- conveying the organic matter by means of a screw conveyor from an inlet opening to an outlet opening which is connected directly and gas-tightly to the digester,
- compacting the organic matter in the screw conveyor to prevent or reduce the passage of gas through the screw conveyor,
- wherein the organic matter is preferably compacted by reducing the passage cross-section of the screw conveyor in the conveying direction, and the passage cross-section is further preferably expanded in the conveying direction prior to said reduction,
- optionally separating fluid from the organic matter by means of a plurality of radial openings in the screw conveyor prior to compacting,
- optionally flushing in a fluid after compacting.
A method for conveying solid materials, said method comprising the steps of:
- conveying the organic matter by means of a screw conveyor from a radial inlet opening extending across an axial section,
- characterised in that the organic solids are conveyed in a first region of the inlet opening by means of a flight having a first pitch and in a second region of the inlet opening downstream from the first region by means of a flight having a second pitch that is longer than the first pitch.
Dependencies are inferred from the claim text.