WO2020217071A1 - Compresseur de déshydratation et procédés le mettant en œuvre - Google Patents

Compresseur de déshydratation et procédés le mettant en œuvre Download PDF

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Publication number
WO2020217071A1
WO2020217071A1 PCT/GB2020/051028 GB2020051028W WO2020217071A1 WO 2020217071 A1 WO2020217071 A1 WO 2020217071A1 GB 2020051028 W GB2020051028 W GB 2020051028W WO 2020217071 A1 WO2020217071 A1 WO 2020217071A1
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WO
WIPO (PCT)
Prior art keywords
compressor
micro
capture
solids
screen
Prior art date
Application number
PCT/GB2020/051028
Other languages
English (en)
Inventor
William Alexander BEVERIDGE
Original Assignee
SEM Energy Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SEM Energy Limited filed Critical SEM Energy Limited
Priority to GB2116918.0A priority Critical patent/GB2597426B/en
Publication of WO2020217071A1 publication Critical patent/WO2020217071A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/03—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/23—Supported filter elements arranged for outward flow filtration
    • B01D29/25—Supported filter elements arranged for outward flow filtration open-ended the arrival of the mixture to be filtered and the discharge of the concentrated mixture are situated on both opposite sides of the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/31—Self-supporting filtering elements
    • B01D29/35—Self-supporting filtering elements arranged for outward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/31—Self-supporting filtering elements
    • B01D29/35—Self-supporting filtering elements arranged for outward flow filtration
    • B01D29/356—Self-supporting filtering elements arranged for outward flow filtration open-ended, the arrival of the mixture to be filtered and the discharge of the concentrated mixture are situated on both opposite sides of the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6438—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
    • B01D29/6476—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a rotary movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
    • B01D29/78—Handling the filter cake in the filter for purposes other than for regenerating for washing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
    • B01D29/80—Handling the filter cake in the filter for purposes other than for regenerating for drying
    • B01D29/82—Handling the filter cake in the filter for purposes other than for regenerating for drying by compression
    • B01D29/828—Handling the filter cake in the filter for purposes other than for regenerating for drying by compression using screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
    • B01D29/965—Device for changing the inclination of the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0058—Inclinable presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/32—Discharging presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/121—Screw constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/127—Feed means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/128—Vertical or inclined screw presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/14—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing operating with only one screw or worm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/18—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing with means for adjusting the outlet for the solid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/08—Screw or rotary spiral conveyors for fluent solid materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/08—Screw or rotary spiral conveyors for fluent solid materials
    • B65G33/14—Screw or rotary spiral conveyors for fluent solid materials comprising a screw or screws enclosed in a tubular housing
    • B65G33/20—Screw or rotary spiral conveyors for fluent solid materials comprising a screw or screws enclosed in a tubular housing the housing being rotatable relative to the screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/08—Screw or rotary spiral conveyors for fluent solid materials
    • B65G33/14—Screw or rotary spiral conveyors for fluent solid materials comprising a screw or screws enclosed in a tubular housing
    • B65G33/22—Screw or rotary spiral conveyors for fluent solid materials comprising a screw or screws enclosed in a tubular housing with means for retarding material flow at the delivery end of the housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/24—Details
    • B65G33/26—Screws
    • B65G33/30—Screws with a discontinuous helical surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/24—Details
    • B65G33/34—Applications of driving gear
    • B65G33/36—Applications of driving gear for rotating housing and screw at different speeds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/24—Details
    • B65G33/34—Applications of driving gear
    • B65G33/38—Applications of driving gear for effecting simultaneous rotation and reciprocation of screw
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/003—Coaxial constructions, e.g. a cartridge located coaxially within another
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/005—Valves
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/24—Separation of coarse particles, e.g. by using sieves or screens

Definitions

  • the present invention relates to compressors, more
  • slurries which may be animal waste derived slurries, mineral oil-based slurries, or other waste materials which it may be desirable to reduce their liquid content prior to further processing.
  • Processing of waste materials may involve various stages.
  • the waste material may be in the form of an animal slurry, comprising a liquid or semi-liquid material.
  • Absorbents may be added and it may be treated with heat in order to convert it into a more useful product, for example fertiliser or growth media.
  • This liquid may typically be water, although other liquids may be present which it is
  • a compressor for dewatering comprising an outer body, a fluid inlet, a fluid outlet, and a fluid cavity defined within the outer body, a screw shaft located within the fluid cavity, the screw shaft comprising a central shaft and a helical screw surrounding said central shaft, and a filter surrounding the screw shaft, the compressor further including a micro-solids capture assembly.
  • the fluid inlet and fluid outlet may comprise pipe or tubing external connections.
  • the fluid inlet and fluid outlet may comprise flanged
  • the micro-solids capture assembly may comprise a capture screen, one or more water jets directed towards and across the capture screen, and a micro-solids entry port.
  • the one or more capture screens may be provided in layers.
  • the capture screen (s) will be substantially planar, and thereby define a capture screen plane.
  • the one or more water jets may be suspended above the capture screen (s) at a first end.
  • the micro-solids entry port may be provided adjacent a second end of the capture screen (s) .
  • the first and second ends may be on distal edges of the capture screen (s) .
  • the one or more capture screens may be wire mesh screen.
  • the one or more capture screens may be a wire wedge screen.
  • capture screen may be employed e.g. there may be provided a wire wedge screen and a wire mesh screen, two wire wedge screens sandwiching a wire mesh screen, two wire mesh screens sandwiching a wire edge screen, four mesh screens arranged mesh-wedge-mesh-wedge or mesh-mesh-wedge- wedge, etc.
  • the one or more capture screens may have a non-stick coating such as TEFLON® coating, Polytetrafluoroethylene (PTFE) coating or other suitable non-stick coating.
  • a non-stick coating such as TEFLON® coating, Polytetrafluoroethylene (PTFE) coating or other suitable non-stick coating.
  • the capture screen (s) may have a filter size of between 100 and 900 pm.
  • the capture screen may have a filter size of 500 pm.
  • Successive capture screens may be arranged such that they employ successively narrower filter sizes, such that
  • the micro-solids capture assembly may include spray bar and one or more spray jets. There may be two such jets.
  • the spray jets may be spade / flat fan jets.
  • the spray bar may be provided across the capture screen with one or both of the jets extending from the spray bar and being angled toward the capture screen plane.
  • the jets may be provided at an angle of between 10 and 45° to the capture screen plane.
  • the jets may be orientated generally towards the second end of the capture screen.
  • water may be sprayed across the capture screen, urging micro-solids towards the micro-solids port.
  • the micro-solids port may be connected to a micro-solids collection assembly.
  • the micro-solids collection assembly may include a screw conveyor or slurry pump or slurry conveyance device.
  • the compressor may further include a non-return valve at the fluid outlet.
  • the non-return valve mechanism may be constructed such that it is housed internally inside the fluid outlet.
  • the non-return valve mechanism may be hermetically sealed against the inner bore of the fluid outlet.
  • the filter may be cylindrical.
  • the filter may be contra-rotatable with respect to the screw shaft .
  • the filter may comprise one or more screen sections.
  • One or more of the screens may be wire screens.
  • One or more of the screens may be wedge wire screens.
  • the screens may comprise an initial screen, an intermediate screen and a terminal screen.
  • One or more of the screens may be contra-rotatable with respect to the screw shaft.
  • the one or more screens may have a non-stick coating such as TEFLON® coating, Polytetrafluoroethylene (PTFE) coating or other suitable non-stick coating.
  • a non-stick coating such as TEFLON® coating, Polytetrafluoroethylene (PTFE) coating or other suitable non-stick coating.
  • the screens may have a filter size of between 50 and 500 pm.
  • the initial screen may have the largest filter size.
  • the initial screen may have a filter size of between 200 and
  • the initial screen may have a filter size of 250 pm.
  • the intermediate screen may have a filter size of between 100 and 200 pm.
  • the intermediate screen may have a filter size of 175 pm.
  • the terminal screen may have a filter size of between 50 and 150 pm.
  • the terminal screen may have a filter size of 100 pm.
  • the screw conveyor may be an offset screw conveyor.
  • the screw conveyor may redirect micro-solids into or adjacent the fluid inlet of the compressor.
  • the central shaft may include a non-uniform section, the non- uniform section having a first outer diameter at a first end and a second outer diameter at a second end, wherein the second diameter is greater than the first diameter.
  • the central shaft may include a uniform section and a non- uniform section.
  • the screw shaft may be of any suitable type, including auger- type, but may also be any other suitable type.
  • the non-uniform section may increase in diameter from the first outer diameter to the second outer diameter in a linear fashion .
  • the second section may increase in diameter from the first outer diameter to the second outer diameter in a non-linear fashion, such as a step change, a multi-step change, a parabolic change, etc.
  • the second section may therefore have a generally frusto- conical shape.
  • the helical screw may have an outer diameter.
  • the outer diameter of the helical screw over the non-uniform section may remain constant.
  • This constant outer diameter may be achieved by a decrease in the extent by which the helical screw projects from the non- uniform section of the screw shaft.
  • the decrease may be complementary to the increase in diameter of the shaft.
  • the helical screw may have a variable pitch.
  • the helical screw may have different pitches on the non- uniform and uniform sections.
  • the helical screw may have a discontinuous section where one or more slots are provided through the helical screw. These slots may allow material to flow more easily along the screw shaft .
  • the discontinuous section may commence at a first end of the screw shaft (the end adjacent the fluid inlet to the
  • the discontinuous section may be less than 50% of the total length of the screw shaft.
  • the discontinuous section may be around 30-40% of the length of the screw shaft.
  • the discontinuous section may comprise at least 720° along the helical screw i.e. two full revolutions around the screw shaft .
  • a compressor for dewatering comprising an outer body, a fluid inlet, a fluid outlet, and a fluid cavity defined within the outer body, a screw shaft located within the fluid cavity, the screw shaft comprising a central shaft and a helical screw surrounding said central shaft, and a filter surrounding the screw shaft, wherein the central shaft includes a non-uniform section, the non-uniform section having a first outer diameter at a first end and a second outer diameter at a second end, wherein the second diameter is greater than the first diameter.
  • the compressor of the second aspect may comprise a micro solids capture assembly. Further optional features of the second aspect may be inferred from optional features listed with respect to the first aspect.
  • a material treatment process including at least one compressor according to the first and/or second aspect of the present invention.
  • a method of treating a material including a stage whereby a material being treated is at least partially dewatered by being fed through a compressor according to the first and/or second aspect of the present invention.
  • Fig. 1 is a perspective view from a first end of a compressor according to the present invention
  • Fig. 2 is a perspective view from a second end of the compressor of Fig. 1;
  • Fig. 3 is a part-sectional perspective view of the dewatering compressor of Fig. 1;
  • Fig. 4 is a part-sectional side elevation of the
  • Fig. 5 is a part-sectional perspective detail view of the micro-solids capture assembly of the compressor of Fig. 1;
  • Fig. 6 is a further part-sectional perspective detail view of the micro-solids capture assembly of the
  • Fig. 7 is a further part-sectional perspective detail view of the micro-solids capture assembly of the
  • Fig. 8 is a part-sectional side elevation detail view of the micro-solids capture assembly of the compressor of Fig. 1;
  • Fig. 9 is a further perspective view of the compressor of Fig. 1;
  • Fig. 10 is a detail perspective view of a capture tray of the compressor of Fig. 1;
  • Fig. 11 is part-sectional side elevation detail view of the outlet valve in a closed position of the compressor of Fig. 1;
  • Fig. 12 is part-sectional side elevation detail view of the outlet valve in an open position of the compressor of Fig. 1;
  • Fig. 13 is a part-sectional perspective view of the dewatering compressor of Fig. 1;
  • Fig. 14 is a part-sectional side elevation of the intake assembly of the compressor of Fig. 1;
  • Fig. 15 is a perspective view of a material treatment process train including the compressor of Fig. 1;
  • Fig. 16 is side elevation an alternative screw
  • Fig. 17 is a side elevation of a further alternative screw compressor profile usable with the compressor of Fig. 1;
  • Fig. 18 is a perspective view of the screw compressor of Fig. 17.
  • a compressor for dewatering generally referred to as 10, comprising an outer body 12, a fluid inlet 14, a fluid outlet 16, and a fluid cavity 18 defined within the outer body 12, a screw shaft 20 located within the fluid cavity 18, the screw shaft 20 comprising a central shaft 22 and a helical screw 24 surrounding the central shaft 22, and a cylindrical filter 26 surrounding the screw shaft 20, the compressor 10 further including a micro-solids capture assembly 28.
  • the micro-solids capture assembly 28 comprises a capture screen 30, and two water jets 32 directed towards and across the capture screen 30, and a micro-solids entry port 34.
  • the capture screen 30 is substantially planar, and thereby defines a capture screen plane 36.
  • capture screens There may be provided one or more capture screens. These one or more capture screens may be provided in layers.
  • capture screen may be employed e.g. there may be provided a wire wedge screen and a wire mesh screen, two wire wedge screens sandwiching a wire mesh screen, two wire mesh screens sandwiching a wire edge screen, four mesh screens arranged mesh-wedge-mesh-wedge or mesh-mesh-wedge- wedge, etc.
  • the one or more capture screens may have a non-stick coating such as TEFLON® coating, Polytetrafluoroethylene (PTFE) coating or other suitable non-stick coating.
  • a non-stick coating such as TEFLON® coating, Polytetrafluoroethylene (PTFE) coating or other suitable non-stick coating.
  • Successive capture screens may be arranged such that they employ successively narrower filter sizes, such that
  • a capture tray 38 is provided at the lowermost portion of the body 12 and generally beneath the fluid cavity 18 and screw shaft 20.
  • the capture tray 38 is a generally shallow
  • rectangular frustum shape comprising two greater length angled side walls 40 running generally parallel to an axis X- X of the compressor 10, and a shorter length angled side wall 42 located adjacent the fluid outlet 16.
  • the micro-solids capture 28 assembly is located distally from the shorter side wall 42 and adjacent the fluid inlet 14.
  • a lower outer wall 44 is positioned at the base of the capture tray 38.
  • assembly 28 is located lower than side wall 42, resulting in the lower outer wall 44 being provided at an angle to the horizontal .
  • the two water jets 32 are suspended above the capture screen 30 at a first end 46.
  • a spray bar 48 both supplies and provides a mounting point for the two water jets 32. It will be appreciated by the skilled addressee that the location and number of spray jets 32 may be varied.
  • the spray jets 32 are spade or flat fan jets.
  • the spray bar 48 is provided across the capture screen with both of the jets 32 extending from the spray bar 48 and being angled toward the capture screen plane 36.
  • the jets 32 are provided at an angle of between 10° and 45° to the capture screen plane 36. In the present embodiment, this is set at 30 ° .
  • a micro-solids capture assembly body 50 is used to mount the various components of the micro-solids capture assembly 28.
  • the assembly body 50 also defines the micro-solids entry port 34.
  • the micro-solids entry port 34 is provided adjacent a second end 52 of the capture screen 30.
  • the first 46 and second ends 52 are on distal edges of the capture screen 30.
  • a simple spray bar valve 49 is located on the spray bar 48 outside the assembly body 50 to enable fluid control.
  • the capture screen 30 is a generally wire mesh screen type; more specifically the capture screen 30 is a wire wedge screen type.
  • the skilled addressee will appreciate that alternative forms of filter media may be employed.
  • the capture screen 30 may for certain applications have a filter size of generally between 100 and 900 pm, although in the present embodiment the capture screen 30 has a filter size of 500 pm.
  • the jets 32 are
  • the micro-solids port 34 feeds into and is connected to a micro-solids collection assembly 54.
  • the micro-solids collection assembly 54 comprises a
  • a micro-solids flanged water outlet pipe 60 extends from the micro-solids assembly body 50, generally perpendicular to the main axis X-X of the compressor 10.
  • the compressor 10 includes a non-return valve 62 at the fluid outlet 16.
  • the fluid outlet 16 comprises a flanged outlet pipe 64 within which sits the non-return valve 62.
  • the non-return valve 62 includes a valve shuttle 66.
  • the valve shuttle 66 is generally cylindrical in form, and may slide to a limited extent within the flanged outlet pipe 64.
  • the valve shuttle 68 comprises an initial plug section 68a, generally in the form of a flattened ellipsoid or disc portion 68a, from which extends a frusto-conical connecting section 68b, which joins at its apex to a larger frusto- conical inlet portion 68c, and onto the main cylindrical section 68d.
  • Seal indentations 68e, 68f are located adjacent the junction between the frusto-conical connecting section 68b and the main cylindrical section 68d, and at the distal extent of the main cylindrical section 68b. Suitable o-ring seals (not shown) are placed within these seal indentation 68e, 68f .
  • the frusto-conical connecting section 68b and the main cylindrical section 68d are hollow and allow material to pass through them when the valve is in the open position (see Fig. 12) .
  • Four or more apertures 68g are provided on the frusto- conical connecting section 68b to enable a fluid pathway to form into the interior of the main cylindrical section 68f.
  • a valve seat 70 is provided within the flanged outlet pipe 64, which at its narrowest point is narrower than the
  • valve seat 70 prevents the valve shuttle 66 from moving too far towards the screw shaft 20.
  • a valve control yoke 72 is provided round the approximate mid-portion of the valve shuttle 68 via a collar attachment groove 74 provided around the valve shuttle 68 on the main cylindrical section 68d.
  • Pneumatic actuators 76 are
  • the central shaft 22 of the screw shaft 20 has a non-uniform diameter along its length, and is split into two discrete sections: an initial uniform section 22a and a second, non- uniform section 22b.
  • the non-uniform section 22b has a first outer diameter at a first end (which is equal in diameter to the initial uniform section 22a) and a second outer diameter at a second end, wherein the second diameter is greater than the first diameter.
  • the screw shaft 20 is an auger-type screw.
  • the non-uniform section 22b increases in diameter from the first outer diameter to the second outer diameter in a linear fashion, albeit it will be appreciated by the skilled
  • the non-uniform section 22b may increase in diameter from the first outer diameter to the second outer diameter in a non-linear fashion, such as a step change, a multi-step change, a parabolic change, etc.
  • the diameter may be non-uniform along the entire length i.e. the non-uniform section accounts for up to 100% of the length of the shaft.
  • the uniform section 22a accounts for approximately 33% of the total length, although this may be varied in alternative embodiments.
  • the second section 22b therefore has a generally frusto- conical shape.
  • the flights 24a of the helical screw 24 has an outer diameter that remains constant over the entire length of the screw shaft 20 i.e. it forms a generally uniform cylindrical outer shape along its entire length.
  • This constant outer diameter is achieved by a decrease in the extent by which the helical screw 24 projects from the non- uniform section of the screw shaft 20.
  • the helical screw 24 has a constant pitch in the present embodiment, although that may be different in alternative embodiments without departing from the scope of the present invention .
  • the helical screw 24 may have different pitches on the non- uniform and uniform sections.
  • a constant torque Variable Frequency Drive (VFD) motor 75 and gearbox 77 is provided to rotate the screw shaft 20.
  • VFD Variable Frequency Drive
  • a screw shaft geared slew ring 79 is driven by the VFD motor 75.
  • the slew ring 79 to drive gear ratio is in the region of 6:1 to 5:1 in the present embodiment, which reduces the required torque from the motor 75.
  • the auger screw shaft 20 is a right hand helix, meaning that it is driven clockwise (from the vantagepoint of the fluid inlet 14) in use.
  • the rotational speed of the screw shaft 20 is fully variable such that the volumetric flow rate may be varied and
  • the highest rotational speed will be typically around 20 RPM for most applications, but will preferably be around 5 RPM. Rotational speed may be varied beyond this level .
  • FIG. 16 An alternative embodiment screw shaft is shown in Fig. 16, generally referred to as 320 . Analogous technical features are numbered similarly, save for a prefix 3 .
  • the screw shaft 320 is also an auger type, but this has variable pitch helical screw section 324a, wherein the distance between subsequent flights narrow progressively over the length of the non-uniform section 322b. There may be some direct proportional relationship between the distance between subsequent flights 324a and the increase in diameter of the second section 322b.
  • the rotational direction of the screw shaft is reversable. This may help with the clearance of blockages.
  • FIG. 17 and 18 An alternative embodiment screw shaft is shown in Figs. 17 and 18, generally referred to as 420 . Analogous technical features are numbered similarly, save for a prefix 4 .
  • the screw shaft 420 is also an auger type, but is provided with an initial discontinuous section 422a which has a central shaft section with a uniform diameter and a non- uniform section where the central shaft has a taper.
  • the discontinuous section 422a commences at the first end of the screw shaft and terminates at the non-uniform section.
  • the discontinuous section 422a in the present embodiment is therefore less than 50% of the total length of the screw shaft 420, and is more specifically around 30-40% of the length of the screw shaft 420.
  • the discontinuous section may comprise at least 720° along the helical screw i.e. two full revolutions around the screw shaft 424. It will be understood that the discontinuous section may be more or less than this.
  • Slots 424s are provided around the screw shaft 424 which means there is no material in those slots between the central shaft and around the outer circumference.
  • the slots 424s are provided with chamfered edges 424t, with the chamfered edges 424t being formed to be complementary to the direction of rotation of the screw shaft.
  • slots 424s partially remove impedance to material flowing along the compressor and may be beneficial when such material has particular physical or flow characteristics for example if the material entering the compressor is
  • a filter 26 is provided around the fluid cavity 18 and screw shaft 20.
  • the filter 26 is cylindrical and forms a close fit around the flights of the screw shaft 20.
  • the outermost edges of the flights may be provided with a coating or may be treated to minimise friction or minimise the gap between the outermost edge of the helical screw 24 and the filter 26.
  • the filter 26 in the present embodiment is rotatable, and contra-rotates with respect to the screw shaft 20.
  • the change in diameter across the non-uniform section 22b of the central shaft 22 results in the flow area (i.e. the annular area between the outer diameter of the central shaft 22 and the inner diameter of the filter 26) being reduced by between 80 and 90%.
  • this is achieved by use of a central shaft 22 having a uniform section diameter of 100mm (also being the initial diameter of the non-uniform section 22b) increasing to a maximum diameter of around 450mm.
  • the filter 26 comprises three individual screen sections 26a, 26b, 26c in the present embodiment, although this may be replaced with more or fewer individual sections, and may comprise simply a uniform screen section across the entire length .
  • the screen sections 26a, 26b, 26c in the present embodiment are wire screens, more specifically wedge wire screens.
  • the screens comprise a lower screen 26a, an upper screen 26c and a centre screen 26b.
  • the screens 26a, 26b, 26c may have a filter size of between 50 and 500 pm in typical applications, with the lower screen 26a typically having the largest filter size.
  • the lower screen 26a may have a filter size of between 200 and 300 pm, but in the present embodiment has a specific filter size of 250 pm.
  • the centre screen 26b may have a filter size of between 100 and 200 pm, but in the present embodiment the centre screen has a filter size of 175 pm.
  • the upper screen 26c may have a filter size of between 50 and 150 pm, but in the present embodiment the upper screen 26c has a filter size of 100 pm.
  • the filter 26 is rotatably mounted at either end of the fluid cavity 18, on an inlet-side hub 78 adjacent the fluid inlet 14 and on an outlet-side hub 80 adjacent the fluid outlet 18.
  • the inlet-side hub 78 has rotational motion imparted through it whereas the outlet-side hub 80 is free-rotating or slave hub.
  • the inlet-side hub 78 is a generally disc-shaped hub mounted on a suitable bearing 82.
  • a geared slew ring 83 attaches to the inlet-side hub 78.
  • the outlet-side hub 80 has a more complex shape than its distal counterpart.
  • the outlet-side hub 80 comprises an attachment flange 84 which mechanically attaches to the filter 26, a frusto-conical hub section 86 attaching to the flange 84, from which extends a cylindrical boss section 88, the latter surrounding the initial inboard portion of the outlet pipe 64. Rotational rod seals are provided between the boss section 88 and the outlet pipe 64.
  • a gasket 92 is provided between the filter 26 and the attachment flange 84.
  • VFD Variable Frequency Drive
  • a support frame 100 mounts the compressor body 12.
  • the support frame 100 comprises an upper support frame 116 which is directly connected to and supports the compressor body 12, a lower stand 118 which contacts the surface upon which the compressor body 10 is to be mounted, first and second support stanchions 120,122 which are provided with pivot pins 124, the stanchions connecting the lower stand 118 to the upper support frame 114 adjacent the inlet pipe 14, and an
  • adjustable support frame 126 which connects the lower stand 118 to the upper support frame 114 adjacent the outlet pipe 16.
  • the adjustable support frame 126 is connected to the upper support frame 114 via pin and lug arrangements 128 at their uppermost portions.
  • a variable sliding support mechanism 130 mounts the
  • variable sliding support mechanism 130 enables the relative position of the join between the adjustable support frame 126 to the lower support frame 118 to be varied such that the angle of adjustable support frame 126 to the lower support frame 118 may be varied, thereby varying the angle of the upper support frame 116 to the horizontal and increasing the relative angle of the compressor body 12.
  • the frame 100 allows the compressor body 12 to be maintained at an angle of around 15 degrees in the present embodiment. Moreover, this angle may be varied using the variable sliding support mechanism 130.
  • FIG. 15 there is shown a water compressor 10 being used in a material treatment process.
  • the treatment apparatus generally referred to as 200, includes a macerator/hopper unit 202 which may be fed with an animal slurry. Absorbents or other materials may be added to aid in the treatment of the said animal slurry and, in the present embodiment, the apparatus 200 and method may be being employed to create growth media.
  • the macerated slurry is pumped along macerator feed line 204 by a positive displacement pump 206 towards a flocculator unit 208 which flocculates the slurry.
  • the compressor 10 having both the inlet flanged pipe and outlet flanged pipe is colloquially hard-piped into the apparatus i.e. it can sustain an internal pressure without risk of the contents leaking or being exposed to the
  • Such water may include micro-solids and the capture tray water jet flushes the water and entrapped micro-solids towards micro solids capture assembly 28.
  • part of the water is further filtered by the screen 30 and falls into and may be pumped away via the water outlet pipe 64. This may then be further filtered as required.
  • Micro-solids in a slightly drier form fall into the micro solids port 34, through the chute portion 54 and are then transported through the pipe 58 via the screw compressor.
  • the animal slurry may then travel on to further process steps, such as a thermal dewatering stage and so forth to finally result in a usable product, such as growth media.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Filtration Of Liquid (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

La présente invention concerne des compresseurs, plus particulièrement des compresseurs de déshydratation, et des procédés ainsi que des méthodes utilisant de tels compresseurs pour traiter des boues liquides, qui peuvent être des boues liquides dérivées de déchets animaux, des boues liquides à base d'huile minérale, ou d'autres déchets dont il peut être souhaitable de réduire la teneur en liquide avant un traitement ultérieur. Le compresseur comprend un corps externe, une entrée de fluide, une sortie de fluide et une cavité de fluide délimitée à l'intérieur du corps externe, un arbre à vis situé à l'intérieur de la cavité de fluide, l'arbre à vis comprenant un arbre central et une vis hélicoïdale entourant ledit arbre central, et un filtre entourant l'arbre à vis, le compresseur comprenant en outre un ensemble de capture de micro-solides.
PCT/GB2020/051028 2019-04-25 2020-04-27 Compresseur de déshydratation et procédés le mettant en œuvre WO2020217071A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2116918.0A GB2597426B (en) 2019-04-25 2020-04-27 Compressor and dewatering processes involving same

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GB1905795.9 2019-04-25
GB1905795.9A GB2586200A (en) 2019-04-25 2019-04-25 Apparatus and method

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GB201905795D0 (en) 2019-06-05
GB2586200A (en) 2021-02-17
GB2597426A (en) 2022-01-26
GB2597426B (en) 2023-05-17

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