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WO1997015783A1 - Nettoyage automatise des bouches de moderation - Google Patents

Nettoyage automatise des bouches de moderation Download PDF

Info

Publication number
WO1997015783A1
WO1997015783A1 PCT/US1995/014015 US9514015W WO9715783A1 WO 1997015783 A1 WO1997015783 A1 WO 1997015783A1 US 9514015 W US9514015 W US 9514015W WO 9715783 A1 WO9715783 A1 WO 9715783A1
Authority
WO
WIPO (PCT)
Prior art keywords
port
plunger
damper
plate
damping
Prior art date
Application number
PCT/US1995/014015
Other languages
English (en)
Inventor
Jeff L. Shelton
Kevin Jay Stallings
Thomas Howard Hogan
Original Assignee
Drayton Corporation
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
Priority to US08/304,402 priority Critical patent/US5531189A/en
Priority claimed from US08/304,402 external-priority patent/US5531189A/en
Application filed by Drayton Corporation filed Critical Drayton Corporation
Priority to PCT/US1995/014015 priority patent/WO1997015783A1/fr
Publication of WO1997015783A1 publication Critical patent/WO1997015783A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L13/00—Construction of valves or dampers for controlling air supply or draught
    • F23L13/10—Construction of valves or dampers for controlling air supply or draught having a compound movement involving both sliding and pivoting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L1/00—Passages or apertures for delivering primary air for combustion 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G1/00—Non-rotary, e.g. reciprocated, appliances
    • F28G1/14—Pull-through rods

Definitions

  • the present invention relates to kraft chemical recovery boilers and more particularly to the air intake ports of such boilers.
  • the present invention relates to the maintenance of such air ports to facilitate the improved efficiency of such boilers.
  • the present invention relates to apparatus for damping selected ones ofthe primary, secondary, or tertiary air ports of the boiler such that automated rodding apparatus may be employed to clear the port on a scheduled or as needed basis.
  • the Particulator Carryover Monitoring System manufactured by Quadtek, Inc. uses an infrared camera which is installed in the upper furnace facing the superheater tubes in a region in which the air flow patterns are constant, avoiding recirculation zones.
  • the video signal from the upper furnace camera is digitized under the control of a computer which counts particles that cross a horizontal hne in the middle ofthe monitor screen.
  • the Particulator's image processor superimposes two (2) arrows on the monitor which defines the line that the computer scans. The particles that pass between the arrows are counted.
  • the accumulated particle counts are displayed in counts per second (CPS) and counts per minute (CPM).
  • a typical recovery boiler operating at a constant firing rate shows significant carryover fluctuation on an hourly basis.
  • the hourly increases are be ⁇ eved to be associated with manual primary air port rodding.
  • the average primary air pressure without continuous rodding was 3.4" H 2 O with an average deviation of .5" H 2 O.
  • primary air pressure was reduced to an average of 2.53" H 2 O with an average standard deviation of .145" H 2 O.
  • the primary air accounts for approximately sixty (60) percent ofthe combustion air. As the ports experience smelt build-up, the air flow rate changes by as much as ten (10) percent. When the smelted ports are manually rodded on two (2) hour intervals the boiler experiences a surge of primary air. This surge can cause particulate from the char bed to be entrained into the flue gas because ofthe sweeping action ofthe primary air over the char bed and leads to increased carryover and char bed shape changes. The surges in primary air were eliminated during continuous manual port rodding resulting in a substantial reduction in carryover and a stabilization ofthe primary air pressure.
  • Another object ofthe invention is to provide an automated damper mechanism which retracts to a non-interfering position upon actuation of an associated rodding mechanism and returns to a preset damping position upon retraction of the rodding mechanism.
  • the present invention uses a pivotally mounted damper to cover the port and provide damping to the boiler furnace.
  • the damper is aligned with and superjacent the rodding mechanism and is supported intermediate the port and the pivotal mounting by a linkage which raises and lowers the damper responsive to linear motion ofthe rodding mechanism.
  • FIG. 1 is a perspective view ofthe apparatus
  • Fig. 2 is a sectional view of a wind box ofa boiler adjacent a port depicting the apparatus in retracted position with the damper proximal the port and depicting in phantom the position ofthe damper and rodding mechanism when actuated;
  • Fig. 3 is a side elevational view ofthe apparatus with the damper shown partially in section and in the port damping position;
  • Fig. 4 is a side elevational view ofthe apparatus as in Fig. 3 with the rodding mechanism in mid-stroke;
  • Fig. 5 is a side elevational view ofthe apparatus as in Fig. 3 with the rodding mechanism extending within the port;
  • Fig. 6 is a perspective view of a multi-port system;
  • Fig. 7 is a side elevational view of a prior art damper in section.
  • FIG. 1 the invention is amenable to integration into existing recovery boilers and is a system which will be readily installed.
  • the invention is depicted with a mounting flange 11, which has formed therein a plurality of apertures 12, through which a plurality of fasteners 13 such as rivets or bolts may extend.
  • the fasteners 13 are used to mount the invention to a wind box 14 of a recovery boiler.
  • the wind box is an air conduit or manifold type structure on the exterior ofthe boiler through which air is delivered to the ports of the boiler and is usually fabricated from sheet metal of appropriate grade and thickness.
  • FIG. 2 the boiler wall is depicted in part at 16 with the boiler port at 17, and a port sleeve 18 extending outwardly from the boiler wall 16.
  • Flange 11 has affixed thereto, externally ofthe wind box 14, a suitable linear actuator 19, preferably a pneumatic cylinder having a piston rod 20 which is extendible and retractable responsive to a remote source of supply connected by appropriate valves and fittings as is well known in the art.
  • Conduits 21 and 22 provide the needed communication with the remote source for actuation ofthe rod 20.
  • Extending within the wind box 14, concentric with the rod 20 is a piston rod sleeve 23. It is to be understood the that the actuator may be connected to the mounting flange 11 by conventional means and that the rod 20 ofthe actuator is to be of sufficient length to extend through the sleeve 23 when in the retracted position.
  • the free end ofthe rod 23 has affixed thereto a plunger assembly 26, which includes an inclined cleaning tip 27, oriented cooperatively with the dimensions of the boiler port 17. That is to say, if the boiler port 17 is substantially vertically oriented having an elongated shape then the cleaning tip 27 is similarly shaped and oriented.
  • the plunger assembly includes a depending leg 28 and an extension leg 29, with the depending leg at a fixed angle relative to the extension leg 29, which is aligned with the rod 20.
  • Affixed to the depending leg 28 at a lower end thereof is a guide rod 31 which extends parallel to the rod 20 through an opening 32 in the flange 11.
  • a guide tube 33 which is concentric with guide rod 31 and receives the guide rod 31 in sliding relation therewithin.
  • an adjustment tube 34 Externally of flange 11 and affixed thereto is an adjustment tube 34, which is also concentric with opening 32 and coaxial with guide rod 31, such that the rod 31 is constrained to reciprocate axially within the guide tube and the adjustment tube 34.
  • Adjustment tube 34 is externally threaded at the end thereof distal the flange 11, and an adjustment nut 36 threadedly engaged thereon.
  • Nut 36 is actually in the form ofa closed end cylinder and is of sufficient length to extend coaxially about adjustment tube 34 for several inches depending upon the degree of engagement ofthe threads thereon.
  • Guide rod 31 is of sufficient length to abut the closed end ofthe adjustment nut 36 when ever the nut is engaged on the adjustment tube 34.
  • a set of bearings 41 which in turn rotatably support a shaft 42 within wind box 14 subjacent rod sleeve 23 and above aperture 32.
  • Damper assembly 43 includes a pair of elongated side members 44 and 46 which may be plates or walls or may be tubular or spar-like in construction. The side members are pivotally connected to the shaft 42 and extend from the flange inwardly within the wind box 14 toward the boiler wall. Affixed to side members distal the shaft 42 is a damper plate 47 which is similar in shape to the damper plates ofthe prior art in that it may be arcuate dimensioned such that it will obscure the boiler port 17 in the manner ofa conventional damper. A top member 48 or plate may be affixed to side members 44 and 46 and plate 47 to form a damper shroud or to provide reinforcement to the assembly.
  • damping plate 47 is movably supported proximal the port 17 or an associated port sleeve 18.
  • Support and movement relative to the boiler port is provided by a pair of damper links 51 and 52 which are individually mounted to side members 44 and 46 by pivot pins 53 and 54.
  • the lower ends ofthe damper links are pivotally mounted to depending leg 28 by a pin 56.
  • the location of pins 53-56 on the associated structures and the length ofthe links 51 & 52 are selected such that when the rod 20 is retracted to its rest position the damper assembly 43 is supported on the links at its lowermost position. At this position it should also be noted that guide rod 31 is in its fully retracted position and abuts adjustment nut 36.
  • Variation of the degree of engagement ofthe nut 36 will vary the retraction of guide rod 31 from within the wind box thus serving to vary the rest position of rod 20 and puncher assembly 26. In as much as the links 51 and 52 are supported on the puncher assembly, such variation will result in the damper plate 47 being supported in its rest position at a corresponding open or "damping" relationship with the port 17. Accordingly, adjustment nut and sleeve may be calibrated and appropriately marked to enable an operator to adjust the damping position ofthe damper from the exterior ofthe wind box.
  • links 51 and 51 Of critical importance in selecting the length and mounting position of links 51 and 51 is the relative position of damping plate 47 and cleaning tip 27 as the tip reaches the throat ofthe port or sleeve 18 as shown in Fig. 4.
  • the links must be mounted such that linear movement ofthe tip toward the port causes the damper assembly to pivot upwardly about shaft 42 to provide clearance for the tip to enter the port and dislodge any smelt accumulation therein as shown in Fig. 5.
  • Retraction ofthe rod 20 and tip 27 returns the assembly to its lowered damping position with the guide rod 31 and nut 34 serving as the retraction stop.
  • Fig. 6 depicts an embodiment wherein a pair of adjacent ports are damped by a common damping assembly 43' and individual cleaning tips 27' and 27" are moved into and out of registry with the ports for cleaning.
  • a common actuator 19' urges the components through their respective motions with a pair of guide rods 31' and 31" providing stability and a variable stop.
  • either embodiment may be controlled automatically by a timer such that rodding occurs on a regular interval and that a computer system may be provided to monitor the furnace for such factors as carryover, fume, and pressure differential and to actuate the apparatus to clear the ports responsive to preset threshold measurements thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air-Flow Control Members (AREA)

Abstract

Dispositif permettant de déboucher les prises d'air dans les chaudières de récupération des produits chimiques. Celles-ci, utilisées généralement pour la récupération de liqueur noire, sont périodiquement arrêtées en raison de l'accumulation excessive de produits entraînés dans les prises d'air. Les bouches de modération permettent de faire varier l'entrée d'air afin d'améliorer le rendement de la chaudière, mais elles ont tendance à se boucher. Les chaudières font donc appel à divers dispositifs de nettoyage pour déboucher les prises d'air. L'invention concerne un système de nettoyage automatique disposé à l'intérieur d'un modérateur d'air pour pousser le rendement de la chaudière. Elle fait appel à un clapet d'air monté pivotant (43) qui permet de recouvrir la bouche (18) et de modérer le foyer de la chaudière. Le clapet (43), aligné avec et placé sur le mécanisme de nettoyage (26), est supporté entre l'orifice (18) et le montage pivotant par une tringle (51, 52) qui élève et abaisse le clapet (43) en réponse à un déplacement linéaire du mécanisme de nettoyage (26).
PCT/US1995/014015 1994-09-12 1995-10-27 Nettoyage automatise des bouches de moderation WO1997015783A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US08/304,402 US5531189A (en) 1994-09-12 1994-09-12 Automated damping port rodder
PCT/US1995/014015 WO1997015783A1 (fr) 1994-09-12 1995-10-27 Nettoyage automatise des bouches de moderation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/304,402 US5531189A (en) 1994-09-12 1994-09-12 Automated damping port rodder
PCT/US1995/014015 WO1997015783A1 (fr) 1994-09-12 1995-10-27 Nettoyage automatise des bouches de moderation

Publications (1)

Publication Number Publication Date
WO1997015783A1 true WO1997015783A1 (fr) 1997-05-01

Family

ID=26789852

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/014015 WO1997015783A1 (fr) 1994-09-12 1995-10-27 Nettoyage automatise des bouches de moderation

Country Status (1)

Country Link
WO (1) WO1997015783A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1327822A3 (fr) * 2002-01-10 2004-03-03 Andritz Oy Dispositif de nettoyage pour nettoyer les entrées d'air d'un four

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5070823A (en) * 1991-01-24 1991-12-10 The Babcock & Wilcox Company Port rodder with anti-drift feature
US5307745A (en) * 1992-09-23 1994-05-03 Anthony-Ross Company Removable damper for chemical recovery furnace
US5351631A (en) * 1992-09-23 1994-10-04 Anthony-Ross Company Removable damper for chemical recovery furnace

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5070823A (en) * 1991-01-24 1991-12-10 The Babcock & Wilcox Company Port rodder with anti-drift feature
US5307745A (en) * 1992-09-23 1994-05-03 Anthony-Ross Company Removable damper for chemical recovery furnace
US5351631A (en) * 1992-09-23 1994-10-04 Anthony-Ross Company Removable damper for chemical recovery furnace

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1327822A3 (fr) * 2002-01-10 2004-03-03 Andritz Oy Dispositif de nettoyage pour nettoyer les entrées d'air d'un four

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