US2914223A - Material feeding apparatus - Google Patents

Material feeding apparatus Download PDF

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Publication number
US2914223A
US2914223A US720494A US72049458A US2914223A US 2914223 A US2914223 A US 2914223A US 720494 A US720494 A US 720494A US 72049458 A US72049458 A US 72049458A US 2914223 A US2914223 A US 2914223A
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Prior art keywords
valve
passageway
steam
conduit
container
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Expired - Lifetime
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US720494A
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English (en)
Inventor
Richter Ole Johan
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Metso Fiber Karlstad AB
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Kamyr AB
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C7/00—Digesters
    • D21C7/06—Feeding devices

Definitions

  • the present invention relate-s to material feeding apparatus. More particularly, it relates to a charging valve device for feedingr comminuted cellulosic liber material, such as wood chips, straw, etc., into a pressure vessel, particularly into a continuous cellulose digester.
  • Known charging valve devices of the above character usually include a housing having ports, and a valve body rotatable in the housing and having one or more passageways, bores or pockets extending transversely therethrough for sequential communication with an inlet port and an outlet port of the housing.
  • Such known devices are usually further characterized in that the housing is provided with a third port adapted to be periodically put in communication with the outlet port through said valve body passageway for periodic flow through said passageway of steam or other suitable hot uid discharging the material in the valve passageway through said outlet port.
  • the object of the invention is to improve the emptying of the passageways or pockets of such Valve devices so that they can be emptied by means of a comparatively small quantity of high-pressure fluid, such as Steam, preferably by means of a quantity less than the steam quantity required for the heating of the material to the digesting temperature.
  • a comparatively small quantity of high-pressure fluid such as Steam
  • this object is attained by providing that the steam or other suitable hot fluid is brought to flow through the pocket or passageway of the valve device during a short time interval and with a speed as high as possible, i.e., as an explosion-like puff or blast, whereby the carrying force exerted by the steam ow upon the charge of material in the valve passageway is of extremely high magnitude.
  • a quick-acting valve there is inserted in the conduit between the steam container and the charging valve device a quick-acting valve, the maximum admission cross sectional area of which is at least equal to one-half of the cross sectional area of the conduit from the container.
  • said quick-acting valve is operated by pressure fluid and is controlled in accordance with rotation of the valve body of the charging valve.
  • This quick-acting valve allows a practically unrestricted flow during the' whole admission time period, said period being kept very short and correctly timed relatively to the position of the passageway or passageways in the charging valve body so that the dynamic action of a certain or predetermined quantity of the hot fluid or steam will be at a maximum.
  • Figure l is a fragmentary, diagrammatic and partially sectioned elevational view of a continuous cooking plant equipped with a feeding apparatus embodying the invention
  • FIGS 2 and 3 are corresponding fragmentary and enlarged vertical sectional views of the charging valve device of Figure l and showing different-operative positions thereof;
  • Figure 4 is a sectional view taken along line IV-IV of Figure 3, and with certain parts being omitted for the sake of clarity and convenience of illustration.
  • Figure l shows a cooking plant provided with an illustrative embodiment of the material feeding apparatus of the invention.
  • Numeral 11 designates an upright cylindrical digester, the upper end of which should be charged continuously with a heated mixture of a comminuted cellulosic fiber material, for example, wood chips, straw, etc., and a suitable digesting liquor, for example, sodium lye. From the bottom of the digester (not shown) the material is discharged continuously at such arate -that a level 13 is maintained somewhat below the upper end of the digester, the rest of the digester being filled with steam.
  • a comminuted cellulosic fiber material for example, wood chips, straw, etc.
  • suitable digesting liquor for example, sodium lye
  • a heating vessel 17 Connected to the upper end of the digester is a heating vessel 17 having a feeding screw 15 therein, as shown, and in which vessel the material, while being stirred, is heated by ⁇ steam to the temperature required for the digesting cook, before the material is delivered into the digester.
  • a raised pressure which can be of the order of 8 atmospheres gauge may be present in the digester 11 and the vessel 17. Additionally, the temperature in the digester may be around to 200 C.
  • the liber material preferably is charged against the pressure in the vessel 17 by means of a charging valve device constructed in accordance with the invention.
  • Said valve device includes a housing 19 and a cylindrical or somewhat frusto-conical rotor or valve body 21 turnable or rotatable therein (see Figures 1 and 4).'
  • a horizontal shaft 23 projects from the rotor 21 and is journalled in bearings 25, 27 suitably mounted on either side of the housing 19 as by spider frames, as shown in Figure 4.
  • the valve body 21 is formed with two axially-spaced passageways o r pockets 29,' 31 therein. These passageways preferably are disposed at right angles to each other and extend diametrically through the valve body. Each passageway forms a straight passage which is somewhat widened at the middle (see Figures 2 and 3) and preferably is of a generally rectangular cross section.
  • The'housing 19, as illustrated, has four ports 33, 35, 37 and 39 which, in the axial direction of the valve body 21, extend across the two passageways 29, 31 (see Figure 4).
  • the ports preferably are arranged in pairs, opposite each other,
  • Port 33 is an inlet port and is placed in communication With the bottom of a low-pressure steaming vessel 43 via a vertical passage 41.
  • a feeding screw 45 may be provided in vessel 43, as indicated.
  • the mixture of comminuted fibrous material and the digesting liquor is charged into the hopper 47 from which it is introduced into vessel 43 by any suitable means, such as the rotary charging device 49.
  • the material is heated in vessel 43, preferably by steam, after which it flows through the passage 41 and into the inlet 33.
  • the valve body passage 31 takes the position shown in Figure 1, the material collected inl the inlet 33 drops down and fills this passageway.
  • a screen 53 (see Figure 2) covers port 37 and prevents the solid material in passageway 31 from entering the conduit 51.
  • the port 35 forms the outlet port of the charging valve device and is connected by the elbow conduit section 55 to the heating vessel 17, as shown.
  • the valve body 21 When the valve body 21 is turned from its Figure 1 position and in the direction of the arrow in Figures 2 and 3, the lled passageway 31 will be sequentially shut off from the inlet 33 and then put into communication with the outlet port 35 under high pressure. When this passageway reaches the position shown in Figure 2, it will be emptied in a manner to be described in more detail by steam supplied through the port 39.
  • a container 57 be arranged in the immediate vicinity of the charging valve device.
  • This container is constructed and arranged to be filled with high-pressure steam supplie-d through a conduit 59 ( Figure l).
  • the far end of said conduit preferably is connected either to a boiler or some other steam generator or to a steam turbine (none of which is shown), from which steam of a suitable pressure is tapped otf for flow to container 57.
  • a pressure is maintained which is somewhat higher than the pressure of the digester 11, for example, such pressure in container 57 may be around 10 to 12 atmospheres gauge.
  • the conduit 59 is made relatively narrow, so that a considerable pressure drop will be produced therein.
  • the container 57 is connected to the port 39 of the charging valve device by means of a comparatively short and wide conduit means 61, 63. lnserted in this conduit means is a valve 65, the maximum admission cross-sectional area of which is approximately of the same size as the cross-sectional area of the conduit part 61, or in any case at least greater than half of the cross-sectional area of conduit 61.
  • conduit 63 widens in the direction toward the port 39, and when the passageway 31 is in the position shown in Figure 2 and the valve 65 is fully opened, a uid flow path having an extremely low resistance to ow will thereby be provided between the steam container 57 and the vessel 17 through Vconduit means 61, 63, valve 65, passageway 31 and conduit 55.
  • valve 65 preferably is provided with a valve body in the shape of a hollow cylindrical slide 67 reciprocably arranged in a cylindrical llining 69 inserted in the valve housing and having admission or flow slits 71 therein.
  • the slide as shown, has upper and lower openings therein and is displaceable between an upper, opened position ( Figure 2), in which the slits 71 are wholly uncovered, and a lower, closed position ( Figure 3), in which the slits are covered by the slide.
  • the lining 69 forms a ush extension of the conduit 61, said conduit 'opening out into one end of the lining.
  • annular space 73 communicating with the conduit part 63, as indicated.
  • the slide 67 preferably is operated by a pneumatic cylinder 75 ( Figure 2) and a piston 77 movable therein.
  • a piston rod 79 connects the piston 77 to the slide.
  • Pressure uid is supplied to cylinder 75 through a conduit 81 and is directed by an appropriate reversing valve 83 alternately to one end of the cylinder 75 and then thc other.
  • Actuation of valve 83 preferably is controlled by a suitable impulse means 85 which, in turn, is actuated by cam lobes 87 on a cam disc 89 attached to the shaft 23 projecting from valve body 21 (see Figures 2 and 4).
  • the impulse means 85 is actuated by a cam lobe 87, as indicated, thereby reversing the valve 33 and admitting pressure fluid to the lower end of the cylinder 75.
  • the piston 77 is then rapidly moved by such pressure uid to the upper end position thereof shown in Figure 2, carrying with it the valve slide 67, so that the slits 71 are wholly uncovered.
  • the cam lobe 87 in question will have passed out of contact with the impulse means 85, and this means then will return to its normal rest position causing reversal of the valve 83 and a consequent ow of pressure fluid into the upper end of cylinder 75.
  • valve 65 will be held open during an interval of 0.25 to 0.5 second.
  • a powerful and fast moving volume of steam is admitted from the container 57 through conduit 61, valve 65, conduit 63, pocket 31 and passage 55.
  • This steam flow meets with no appreciable resistance until it reaches passageway 31, where the steam penetrates the spaces between the particles of the charge in the passageway, exerting ya force of great magnitude thereon, so that the charge is rapidly and conipletely driven out of the passageway and through the conduit 55 for discharge into the vessel 17.
  • passageway 31 will be returned to the charging position thereof shown in Figure l, whereafter the aforedescribed cycle will be repeated.
  • passageway 29 will be charged and emptied in the same manner as that described for passageway 31, but with a time lag corresponding to a rotary movement of the valve body 21 of 90.
  • the sequential charging and discharging operations for the passageway 29 will be 90 out of phase with respect to lthose for passageway 31.
  • the short steam blasts or puffs coming from the steam container 57 pass :alternately or sequentially through the passageway 29 and passageway 31 and, as is evident, during each revolution of the valve body 21 four separate charges will be transferred from the low to the high pressure side through passageways 29, 31.
  • each steam puff or blast passing therethrough must 'be of ⁇ a volume of at least about twice as large as the volume of each passageway, preferably to 10 times larger than the volume of the passageway. It is advantageous to maintain an over-pressure in the container S7 as compared to the digester pressure, and therefore, the volume of the container is made a few times, for example, 2 to 5 times, larger than the volume of each blast of steam.
  • Branching off from the steam supply tube 59 is a tube 93 leading into the side of the passage 55, as shown in Figure 1. Inserted in tube 93 is .a valve 95 controlled by a suitable temperature-sensitive means 9/ arranged in the digester wall and operatively connected to the valve 95.
  • a suitable temperature-sensitive means 9/ arranged in the digester wall and operatively connected to the valve 95.
  • the desired temperature of the digester 11 can be maintained by controlling that part of the steam passing through the tube 93.
  • the steam consumption is as low as 0.5 kgs. per ton of dry pulp produced, only a part of the total quantity of steam need be used for emptying the passageways 29, 31 of the charging valve device.
  • Apparatus for feeding fibrous materials or the like into a pressure vessel comprising: a valve housing having spaced material inlet and outlet ports; a valve body rotatably mounted in said housing being provided with at least one passageway extending transversely therethrough; means for rotating said valve body for sequentially disposing said passageway in commun-ication with said spaced inlet and outlet ports; said housing also having a third port arranged for communication with said outlet port through said passageway of said valve body; a container for hot uid under pressure; said container being arranged in the immediate vicinity of said third port and having a volume considerably greater than the volume of said passageway of said valve body; conduit means connecting said container to said third port; a quick-acting valve arranged in said conduit means between said container and said third port, the maximum admission cross-sectional area of said latter valve being at least equal to one-half the cross-sectional area of said conduit means between said container and said latter valve; fluid pressure actuated means operatively connected to said quick-acting valve and said rota
  • Apparatus for feeding brous materials or the like into a pressure vessel comprising: a valve housing having spaced material inlet and outlet ports; a valve body rotatably mounted in said housing being provided with at least one passageway extending transversely therethrough; means for rotating said valve body for sequentially disposing said passageway in communication with said spaced inlet and outlet ports; said housing also having a third port arranged for communication with said outlet port through said passageway of said valve body; a container for hot fluid under pressure; said container being arranged in the immediate vicinity of said third port and having a volume considerably greater than the volume of said passageway of said valve body; conduit means connecting said container to said third port; a quick-acting valve arranged in said conduit means between said container and said third port, the maximum admission cross-sectional area of said latter valve being at least equal to one-half the cross-sectional area of said conduit means between said container and said latter valve; means for eifecting a periodic discharge of a blast or puff of fluid from said container through said quick-acting

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US720494A 1957-03-11 1958-03-10 Material feeding apparatus Expired - Lifetime US2914223A (en)

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SE2914223X 1957-03-11

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DE (1) DE1056467B (fr)
FR (1) FR1173505A (fr)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3142864A (en) * 1959-10-27 1964-08-04 Tru Scale Inc Means and method for the formation of paneling having a foamed plastic core
US3227312A (en) * 1964-09-08 1966-01-04 Nat Distillers Chem Corp Shot injector
US3249263A (en) * 1963-07-25 1966-05-03 Phillips Petroleum Co Particulate material feeding
US3288053A (en) * 1963-05-31 1966-11-29 Gen Mills Inc Feed valve
US3291347A (en) * 1964-09-10 1966-12-13 Coulter Electronics Apparatus for dispensing measured volumes of fluid
US3321109A (en) * 1966-06-28 1967-05-23 James M Beebe Disseminator including a rotatable metering wheel with fluid ejector means
US3344887A (en) * 1964-08-03 1967-10-03 Bendix Corp Machine tool lubricator
US3950146A (en) * 1974-08-08 1976-04-13 Kamyr, Inc. Continuous process for energy conserving cooperative coal feeding and ash removal of continuous, pressurized coal gasifiers and the like, and apparatus for carrying out the same
US3950147A (en) * 1974-08-08 1976-04-13 Kamyr, Inc. Process for feeding coal to a fluidized bed or suspended particle pressurized processing chamber and apparatus for carrying out the same
US4017270A (en) * 1974-01-31 1977-04-12 Kamyr, Inc. Coal gasification process with improved procedures for continuously feeding lump coal under pressure
US4073629A (en) * 1974-07-30 1978-02-14 Kamyr Inc. Coal gasification process with improved procedure for continuously discharging ash particles and apparatus therefor
US4082368A (en) * 1974-07-16 1978-04-04 Kamyr Inc. Method and apparatus for hydraulic transmission of coal, oil shale, mineral ores, etc. from the face to the surface of underground mines
US4087214A (en) * 1975-12-24 1978-05-02 Delta Scientific Corporation Motive fluid supply system for metering valve
FR2409433A1 (fr) * 1977-11-18 1979-06-15 Nat Petro Chem Robinet doseur discontinu
US4187043A (en) * 1974-07-23 1980-02-05 Kamyr, Inc. Method and apparatus for boosting pressure in a coal pipeline
USRE31282E (en) * 1977-11-18 1983-06-21 National Petro Chemicals Corporation Shot-feeding metering valve
US4611731A (en) * 1983-12-23 1986-09-16 Pfister Gmbh Automatic metering apparatus
US5236285A (en) * 1992-04-15 1993-08-17 Kamyr, Inc. High pressure feeder
US5766418A (en) * 1996-09-13 1998-06-16 Ahlstrom Machinery Inc. Handling fibrous material used to produce cellulose pulp
US6468006B1 (en) 1999-05-11 2002-10-22 Andritz, Inc. High pressure feeder having restriction ramp in high pressure inlet
US20030215293A1 (en) * 1999-05-11 2003-11-20 Andritz Inc. High pressure feeder having smooth pocket in rotor
US20090158664A1 (en) * 2007-12-20 2009-06-25 Jyung-Hoon Kim Rotary apparatus for use with a gasifier system and methods of using the same
US20110002759A1 (en) * 2007-08-01 2011-01-06 Tetsuro Murayama Method and apparatus for forcing gas-solid two-phase substance
US10240287B2 (en) * 2014-09-12 2019-03-26 Andritz Oy Heating of hydraulic digesters
EP3817996A4 (fr) * 2018-07-02 2022-04-06 Valmet Ab Système de distribution et procédé de distribution de matière cellulosique broyée dans une zone de traitement à haute pression

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2151511A (en) * 1936-02-06 1939-03-21 Corn Prod Refining Co Valve
US2299565A (en) * 1942-02-02 1942-10-20 Richard R Colburn Pneumatic feeder
US2356737A (en) * 1941-12-08 1944-08-29 Roy Elliot Cavins Can filling machine
US2644724A (en) * 1951-04-12 1953-07-07 Kronstad Haavard Feeder for fluid current conveyers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2151511A (en) * 1936-02-06 1939-03-21 Corn Prod Refining Co Valve
US2356737A (en) * 1941-12-08 1944-08-29 Roy Elliot Cavins Can filling machine
US2299565A (en) * 1942-02-02 1942-10-20 Richard R Colburn Pneumatic feeder
US2644724A (en) * 1951-04-12 1953-07-07 Kronstad Haavard Feeder for fluid current conveyers

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3142864A (en) * 1959-10-27 1964-08-04 Tru Scale Inc Means and method for the formation of paneling having a foamed plastic core
US3288053A (en) * 1963-05-31 1966-11-29 Gen Mills Inc Feed valve
US3249263A (en) * 1963-07-25 1966-05-03 Phillips Petroleum Co Particulate material feeding
US3344887A (en) * 1964-08-03 1967-10-03 Bendix Corp Machine tool lubricator
US3227312A (en) * 1964-09-08 1966-01-04 Nat Distillers Chem Corp Shot injector
US3291347A (en) * 1964-09-10 1966-12-13 Coulter Electronics Apparatus for dispensing measured volumes of fluid
US3321109A (en) * 1966-06-28 1967-05-23 James M Beebe Disseminator including a rotatable metering wheel with fluid ejector means
US4017270A (en) * 1974-01-31 1977-04-12 Kamyr, Inc. Coal gasification process with improved procedures for continuously feeding lump coal under pressure
US4082368A (en) * 1974-07-16 1978-04-04 Kamyr Inc. Method and apparatus for hydraulic transmission of coal, oil shale, mineral ores, etc. from the face to the surface of underground mines
US4187043A (en) * 1974-07-23 1980-02-05 Kamyr, Inc. Method and apparatus for boosting pressure in a coal pipeline
US4073629A (en) * 1974-07-30 1978-02-14 Kamyr Inc. Coal gasification process with improved procedure for continuously discharging ash particles and apparatus therefor
US3950146A (en) * 1974-08-08 1976-04-13 Kamyr, Inc. Continuous process for energy conserving cooperative coal feeding and ash removal of continuous, pressurized coal gasifiers and the like, and apparatus for carrying out the same
US3950147A (en) * 1974-08-08 1976-04-13 Kamyr, Inc. Process for feeding coal to a fluidized bed or suspended particle pressurized processing chamber and apparatus for carrying out the same
US4087214A (en) * 1975-12-24 1978-05-02 Delta Scientific Corporation Motive fluid supply system for metering valve
FR2409433A1 (fr) * 1977-11-18 1979-06-15 Nat Petro Chem Robinet doseur discontinu
USRE31282E (en) * 1977-11-18 1983-06-21 National Petro Chemicals Corporation Shot-feeding metering valve
US4611731A (en) * 1983-12-23 1986-09-16 Pfister Gmbh Automatic metering apparatus
US5236285A (en) * 1992-04-15 1993-08-17 Kamyr, Inc. High pressure feeder
US5766418A (en) * 1996-09-13 1998-06-16 Ahlstrom Machinery Inc. Handling fibrous material used to produce cellulose pulp
US6616384B2 (en) 1999-05-11 2003-09-09 Andritz, Inc. High pressure feeder having smooth pocket in rotor
US6468006B1 (en) 1999-05-11 2002-10-22 Andritz, Inc. High pressure feeder having restriction ramp in high pressure inlet
US20030215293A1 (en) * 1999-05-11 2003-11-20 Andritz Inc. High pressure feeder having smooth pocket in rotor
US20030231933A1 (en) * 1999-05-11 2003-12-18 Andritz Inc. High pressure feeder having smooth pocket in rotor
US6669410B2 (en) 1999-05-11 2003-12-30 Andritz Inc. High pressure feeder having smooth pocket in rotor
US20110002759A1 (en) * 2007-08-01 2011-01-06 Tetsuro Murayama Method and apparatus for forcing gas-solid two-phase substance
US20090158664A1 (en) * 2007-12-20 2009-06-25 Jyung-Hoon Kim Rotary apparatus for use with a gasifier system and methods of using the same
US8651772B2 (en) * 2007-12-20 2014-02-18 General Electric Company Rotary apparatus for use with a gasifier system and methods of using the same
US10240287B2 (en) * 2014-09-12 2019-03-26 Andritz Oy Heating of hydraulic digesters
EP3817996A4 (fr) * 2018-07-02 2022-04-06 Valmet Ab Système de distribution et procédé de distribution de matière cellulosique broyée dans une zone de traitement à haute pression

Also Published As

Publication number Publication date
DE1056467B (de) 1959-04-30
FR1173505A (fr) 1959-02-26

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