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WO1996006673A1 - Procede et appareil d'egalisation de la pression dans un dispositif d'alimentation a piston - Google Patents

Procede et appareil d'egalisation de la pression dans un dispositif d'alimentation a piston Download PDF

Info

Publication number
WO1996006673A1
WO1996006673A1 PCT/FI1995/000448 FI9500448W WO9606673A1 WO 1996006673 A1 WO1996006673 A1 WO 1996006673A1 FI 9500448 W FI9500448 W FI 9500448W WO 9606673 A1 WO9606673 A1 WO 9606673A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
compression
cylinder
space
feeder
Prior art date
Application number
PCT/FI1995/000448
Other languages
English (en)
Inventor
Risto Laukkanen
Reijo Kilpeläinen
Original Assignee
Andritz-Patentverwaltungs-Gmbh
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 Andritz-Patentverwaltungs-Gmbh filed Critical Andritz-Patentverwaltungs-Gmbh
Priority to AU32589/95A priority Critical patent/AU3258995A/en
Publication of WO1996006673A1 publication Critical patent/WO1996006673A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/02—Feed or outlet devices therefor

Definitions

  • the invention relates to a method as set forth in the pream ⁇ ble of claim 1 and to an apparatus as set forth in the preamble of claim 4 for the equalization of pressure when feeding material into a pressurized space by means of a piston feeder.
  • Patent application FI A 921403 discloses a method and appa ⁇ ratus for feeding material into a pressurized space.
  • This prior known solution involves the use of two pistons or plungers one nested inside the other, the material to be fed being first introduced into a piston-cylinder through a charge opening which is shut by bringing the outer piston to a bottom position in the piston-cylinder. Thereafter, the inner piston operable within the outer piston is used for carrying the material into a pressurized space. A gate leading to the pressurized space is opened after the charge opening has been shut and separate pressure and gas sources are used for maintaining the pressure as well as the gas composition in the cylinder as equal as possible to that existing in the pressurized space.
  • a solution of the invention is capable of securing the pressure fluctuations within an acceptable range as material is fed into a pressurized space by the high-speed action of a feed piston.
  • the energy required for a piston feeder in the delivery of material is preferably acquired from a pressurized space. In fact, all that is required is to overcome the resistance caused by kinetic frictions of the pistons.
  • the power acquired by the apparatus from external energy sources does not show sudden fluctuations. The energy demand is lower and no pressure accumulators are needed to produce a high peak power for a piston, feeder.
  • the pressure differences between a carburator and a pressure chamber at various stages of material feed and process can be minimized.
  • the gas used in high-pressure combustion is nitrogen.
  • a solution of the invention is capable of consid ⁇ erably reducing the loss of nitrogen.
  • by controlling the pressure difference it is possible to block the escape of combustion gases from the carburator back into the feeding chamber.
  • fig. 1 shows a piston feeder exploiting the invention
  • - fig. 2 shows an equalizing piston of the invention
  • Fig. 1 illustrates a piston feeder for delivering material into a pressurized space.
  • the apparatus corresponds essentially to that described in the Patent application FI A 921403.
  • the apparatus is used for feeding a solid fuel into a pressurized silo 1 by carry- ing the fuel along a supply pipe to a connector 30 included in the apparatus.
  • the housing of a solid-material feeding apparatus comprises a cylinder 8, whose wall is provided with an opening 28 in line with the connector 30 for delivering a solid material into the apparatus.
  • the cylinder 8 is provided with a cover 31 which is fastened to the flanged top rim of the cylinder.
  • the bottom rim of the cylinder is provided with a collar 32, to which is fastened a collar 33 included in a feeding chamber 12 and located below the cylinder. Between the collars or flanges 32 and 33 is fitted a spacer 34 and the inner surface of the spacer is provided with a gasket 40.
  • a piston 9 is operated in the cylinder 8 by means of a hydraulic actuator 35 mounted on the cover 31.
  • the piston In its rear- ward position, the piston has its leading edge flush with the top edge of the opening 28 such that the opening is open and, its forward position, the piston's leading edge is fitted to gasket 40 between cylinder 8 and feeding chamber 12, said feeding chamber 12 becoming tightly sealed on its side facing the cylinder 8.
  • the piston shuts off said opening 28 in the wall of cylinder 8.
  • the piston 9 comprises an outer piston 10 and an inner piston 11, which is operable relative to the outer piston 10. In its rearward position, the inner piston lies within the outer piston and its travel path extends in its forward position all the way to the bottom of feeding chamber 12.
  • the inner piston is operated by means of a hydraulic inner- piston actuator 36 , which is connected via a conduit 56 and control elements to a pressure cylinder 50 which the inner piston receives its operating energy from, as described hereinbelow.
  • a hydraulic inner- piston actuator 36 which is connected via a conduit 56 and control elements to a pressure cylinder 50 which the inner piston receives its operating energy from, as described hereinbelow.
  • gasket rings 37 Between the inner piston 11 and the outer piston 10 are fitted gasket rings 37 for sealing the inter- piston contact surface.
  • the gasket rings can be teflon- coated steel rings and tha outer piston is provided with corresponding grooves therefor.
  • the bottom rim of feeding chamber 12 is fitted with a pres ⁇ sure gate 13 pivotable about a hinge pin 38 and providing a closure means between the feeding chamber 12 and a space 39 leading to the silo 1.
  • the space 39 is defined by a wall 42 having its bottom section provided with a collar 44 to which is fastened a collar 46 included in the pressurized silo 1.
  • the silo 1 is provided with a pipe 48 to connect therewith a compression cylinder 50 with a compression piston 52 fitted therein.
  • the compression piston 52 is part of a hydraulic mecha ⁇ nism 54, which is further linked by way of a hydraulic cylinder 66, a valve mechanism 72 and a hydraulic piping 56, serving as energy transmitters, to a drive unit for the inner piston 11 of a piston feeder.
  • the hydraulic mechanism 54 consists of said compression cylinder 50, inside which is fitted the compression piston 52 sealed against the inner walls of the cylinder 50 by means of gaskets 58 mounted on the piston.
  • the compression cylinder 50 is fastened by its bottom collars or flanges 60 to a spacer element 62, which is further fastened to the pipe 48 extending to the silo 1.
  • the bottom section of said spacer element is fitted with a filter 63 for blocking the passage of solid material from the pressurized silo into the compression cylinder.
  • the filter can also be located in some part of the pipe 48.
  • the compression cylinder has its top collar 64 fastened to a bottom plate 68 included in the hydraulic cylinder 66 mount ⁇ ed thereupon. Inside the hydraulic cylinder is fitted a hydraulic piston (not shown), which is permanently linked to a rod 70 included in the compression piston 52 and extending through the bottom plate 68.
  • valve mechanism 72 On top of the hydraulic cylin ⁇ der is the valve mechanism 72 for controlling a hydraulic fluid as required by various operating sequences of the apparatus.
  • the valve mechanism is connected means of a pipe 74 with the bottom section of the hydraulic cylinder below the hydraulic piston. Extending from the valve mechanism is also the pipe or conduit 56 to the drive unit for the inner piston of a pressure feeder, as pointed out above.
  • the valve mechanism further includes hydraulic pumps for pumping a hydraulic fluid to various sections of a hydraulic system, as described hereinbelow.
  • the bottom plate of the hydraulic cylinder is provided with an opening 76, which is fitted with an indicator 78 showing the position of the piston.
  • the duration of a single full working sequence or cycle is about 30 seconds.
  • the outer piston 10 is re ⁇ tracted to a rearward position and the pressure gate 13 is closed. Above the pressure gate 13 exists an atmo ⁇ spheric pressure and below e.g. a pressure of 30 bars.
  • a charge 80 of solid material is delivered through the feeding connector on top of the pressure gate.
  • the com ⁇ pression piston 52 lies about half-way down the compres ⁇ sion cylinder 50 and being advanced towards the bottom of the compression cylinder by using the valve mechanism for pumping a hydraulic fluid through the pipe 74 from below to above the hydraulic piston.
  • the outer piston 10 is extended to a forward position towards the pressure chamber such that its leading edge comes into a contact with the sealing surface included in the junction between the cylinder and the feeding chamber (fig.
  • the inner piston 11 lies within the outer piston 10 at this point.
  • the solid material 80 is retained in an isolated space whose pressure is equalized with the space below the pressure gate 13, the latter space being in communication with the pressurized feeding silo. This is effected by introducing into this space a gas having a pressure equal to that in the feeding silo.
  • the final pressure equalization is effected by opening a valve (not shown) included in a pipe connecting said spaces.
  • the compression piston 52 is almost in its bottom position, which it reaches prior to opening the pressure gate 13 (fig. 3c).
  • valve mechanism In this sequence of a cycle, the valve mechanism is con ⁇ trolled such that the silo pressure, acting through the pipe 48 on the bottom surface of the compression piston, is transmitted under the control of said valve mechanism 72 through the hydraulic mechanism 66 and piping 56 to act on and operate the inner piston of a pressure feeder.
  • the compression piston 52 travels to its top posi- tion and the inner piston 11 of a pressure feeder pushes to the forward position towards the pressurized space (fig. 3 ), the solid material charge 80 progressing into the space over on the other side of the gate. Since the pressurized space has a volume which remains constant during this temporally relatively short sequence, all that the piston-operating mechanisms are required to produce is a force needed for overcoming the kinetic frictions of the inner piston and compression piston.
  • the outer and inner pistons as well as the pressure gate and compression piston and valves are con ⁇ trolled relatively synchronized, whereby the pressure gate can only be open when the feeding chamber is pressurized and the outer piston is in a tight abutment against the top edge of said feeding chamber to seal the pressure chamber.
  • the operating equipment for the pistons and a drive mechanism (not shown) for the pressure gate are preferably linked to each other. There are several options to achieve this.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Reciprocating Pumps (AREA)

Abstract

Procédé et appareil destinés à égaliser la pression dans un dispositif d'alimentation (10, 11) à piston destiné à introduire du matériau dans un espace sous pression (1). Ledit procédé consiste à introduire une matière dans un espace (8) de cylindre se trouvant dans le dispositif d'alimentation à piston, à fermer et mettre l'espace (8) de cylindre sous pression, et à utiliser un piston (11) placé dans le dispositif d'alimentation pour faire avancer la matière dans l'espace sous pression (1). Selon la présente invention, un piston de compression (52) placé dans un cylindre de compression (50) relié à l'espace sous pression (1) est entraîné en même temps que le piston (11) du dispositif d'alimentation à piston de telle manière qu'une pression dans l'espace sous pression (1) reste pratiquement constante et que l'énergie cinétique dudit piston de compression (52) soit utilisée pour faire fonctionner le piston (11) du dispositif d'alimentation.
PCT/FI1995/000448 1994-08-26 1995-08-23 Procede et appareil d'egalisation de la pression dans un dispositif d'alimentation a piston WO1996006673A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU32589/95A AU3258995A (en) 1994-08-26 1995-08-23 Method and apparatus for the equalization of pressure in a piston feeder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI943915A FI95504C (fi) 1994-08-26 1994-08-26 Menetelmä ja laitteisto paineen tasaamiseksi mäntäsyöttimessä
FI943915 1994-08-26

Publications (1)

Publication Number Publication Date
WO1996006673A1 true WO1996006673A1 (fr) 1996-03-07

Family

ID=8541246

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1995/000448 WO1996006673A1 (fr) 1994-08-26 1995-08-23 Procede et appareil d'egalisation de la pression dans un dispositif d'alimentation a piston

Country Status (3)

Country Link
AU (1) AU3258995A (fr)
FI (1) FI95504C (fr)
WO (1) WO1996006673A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003013714A1 (fr) * 2001-08-11 2003-02-20 Sicco K/S Procede pour le transfert de produits solides particulaires entre des zones de pression differente
WO2009103697A2 (fr) * 2008-02-18 2009-08-27 Siemens Aktiengesellschaft Système d'introduction de poussières
US8721299B2 (en) 2009-10-14 2014-05-13 Thermochem Recovery International, Inc. Piston member, an apparatus comprising the piston member, and methods and use of the piston member and the apparatus
WO2015062668A1 (fr) * 2013-11-01 2015-05-07 Envac Ab Compactage de déchets

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3042229A (en) * 1960-09-07 1962-07-03 Dorries A G O Feed arrangement
US3608616A (en) * 1968-03-22 1971-09-28 Schloemann Ag Continuous casting apparatus with pressure equalization chamber
DE4306326A1 (de) * 1992-03-30 1993-10-07 Kone Oy Verfahren und Einrichtung zum Einspeisen eines Materials in einen beaufschlagten Raum

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3042229A (en) * 1960-09-07 1962-07-03 Dorries A G O Feed arrangement
US3608616A (en) * 1968-03-22 1971-09-28 Schloemann Ag Continuous casting apparatus with pressure equalization chamber
DE4306326A1 (de) * 1992-03-30 1993-10-07 Kone Oy Verfahren und Einrichtung zum Einspeisen eines Materials in einen beaufschlagten Raum

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003013714A1 (fr) * 2001-08-11 2003-02-20 Sicco K/S Procede pour le transfert de produits solides particulaires entre des zones de pression differente
US7600960B2 (en) 2001-08-11 2009-10-13 Christensen Lena H Method for transfer of particulate solid products between zones of different pressure
WO2009103697A2 (fr) * 2008-02-18 2009-08-27 Siemens Aktiengesellschaft Système d'introduction de poussières
WO2009103697A3 (fr) * 2008-02-18 2009-11-26 Siemens Aktiengesellschaft Système d'introduction de poussières
US8721299B2 (en) 2009-10-14 2014-05-13 Thermochem Recovery International, Inc. Piston member, an apparatus comprising the piston member, and methods and use of the piston member and the apparatus
WO2015062668A1 (fr) * 2013-11-01 2015-05-07 Envac Ab Compactage de déchets

Also Published As

Publication number Publication date
AU3258995A (en) 1996-03-22
FI95504B (fi) 1995-10-31
FI943915A0 (fi) 1994-08-26
FI95504C (fi) 1996-02-12

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