EP0490804B1 - Conduit d'alimentation pour brûler de la paille - Google Patents

Conduit d'alimentation pour brûler de la paille Download PDF

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Publication number
EP0490804B1
EP0490804B1 EP19910610095 EP91610095A EP0490804B1 EP 0490804 B1 EP0490804 B1 EP 0490804B1 EP 19910610095 EP19910610095 EP 19910610095 EP 91610095 A EP91610095 A EP 91610095A EP 0490804 B1 EP0490804 B1 EP 0490804B1
Authority
EP
European Patent Office
Prior art keywords
valve
water
duct
feed duct
straw
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP19910610095
Other languages
German (de)
English (en)
Other versions
EP0490804A2 (fr
EP0490804A3 (en
Inventor
Jens Jorgen Bagge Svendsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bioener ApS
Original Assignee
Burmeister and Wain Energy AS
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 Burmeister and Wain Energy AS filed Critical Burmeister and Wain Energy AS
Publication of EP0490804A2 publication Critical patent/EP0490804A2/fr
Publication of EP0490804A3 publication Critical patent/EP0490804A3/en
Application granted granted Critical
Publication of EP0490804B1 publication Critical patent/EP0490804B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus

Definitions

  • the present invention relates to a feed duct for a straw firing furnace comprising a slide valve with a valve member for closing of the duct, a sprinkler in a wall of the duct upstream of the slide valve, a water supply valve and a water supply pipe for the sprinkler, and means for control and activation of the opening and closing of the valve member and the water supply valve.
  • a feed duct of this type is known, in which a fire in the straw in the duct is extinguished by means of water supplied through the sprinkler.
  • a plant for combustion of solid fuel, for instance wood is disclosed, in which a thermostatically activated water supply valve is mounted in the duct, said valve opening for the addition of water to the fuel in the duct between a supply piston for fuel and the furnace space, when the temperature in the duct exceeds a certain level.
  • DE-A- 2 933 786 reveals a feed duct with a sprinkler positioned close to the slide valve.
  • a fire may, however, also arise in the feed duct for other reasons, for instance when the straw fired furnace is to be stopped, both in case of a planned stop or in case of an emergency stop, for instance caused by a too low water level in an associated boiler.
  • the fire will spread through surface burning from the furnace space to the feed duct upstream of the water-cooled part of the duct until also the straw under the valve member catches fire and has to be extinguished by the operators of the plant in order to prevent further spreading of the fire to other parts of the plant. Due to the often violent and prolonged generation of heat in the burning straw the involved parts of the slide valve and the feed duct may be damaged, for instance through deforming or cracking, resulting in an unintended operational break-down and considerable repair costs.
  • the object of the invention is to provide a feed duct of the kind stated by way of introduction, by means of which water is prevented from entering the furnace space, when a fire in the duct is extinguished, and by means of which the slide valve is secured against damage on account of the heat generation.
  • the invention provides a feed duct, which ensures that a fire is so effectively extinquished that a straw fired plant, of which the duct is a part, may be operated without the constant presence of an operator.
  • the feed duct according to the invention differs from the known types in that that the sprinker is adapted to sprinkle said valve member by water, and that the bottom of the housing of the slide valve is positioned lower than the bottom of the feed duct and is provided with drain openings for draining off water supplied through the sprinkler.
  • the water from the sprinkler in addition to thoroughly drenching the straw in the duct upstream of the slide valve, cools off the slide valve so that it will not deform on account of the heat generated.
  • the water supplied is drained off through the valve housing and consequently does not penetrate into the furnace space or spread further upstream in the duct, whereby damages in these parts are prevented.
  • the last-mentioned measure further has the additional advantage that water may be added in bigger amounts and over longer periods than is the case with the known plant.
  • valve member of the first slide valve may be hollow and adapted for being filled with water.
  • a third embodiment of the feed duct according to the invention there may, when the valve member, as described above, is independently cooled, be provided means for intermittent supply of water to the spray nozzle.
  • a fourth embodiment of the feed duct according to the invention is characteristic in that upstream of the sprinkler a second slide valve for closing of the duct is mounted, that its valve housing is provided with drain openings for draining off water supplied through the sprinkler and means for controlling and activating the opening and closing of the valve members, and in that the means for control and activation of the valve members are adapted to simultaneously close both slide valves.
  • the duct portion downstream of the first slide valve may be water-cooled, which has the effect that also this portion of the duct is secured against damage due to violent heat generation.
  • the drawing shows a feed duct 1, which at one end is connected with a inlet duct 2, through which straw from a silo (not shown) is conveyed down in front of a piston 3, which moves backwards and forwards as indicated by the arrow A and thereby presses the straw into the duct.
  • the other end of the feed duct 1 leads through the front wall 4 of a straw fired furnace and opens into a furnace space 5.
  • a portion 6 of the duct 1 adjoining the front wall 4 is provided with a cooling jacket 7, and the space 8 between the cooling jacket 7 and the outer wall of the duct 1 is flowed through by cooling water.
  • the downstream slide valve 10 is mounted directly on the water-cooled duct portion 6.
  • the slide valve 10 comprises a valve housing 12, a valve member 13, and a pneumatic activating cylinder 14, which through its piston rod 15 displaces the valve member 13 between the open position shown in the drawing, in which the straw can freely pass through the valve housing 12 to the furnace space 5, and a closed position, in which the valve member 13 completely blocks the passage of the straw.
  • Slide valve 11 is in the same way as slide valve 10 provided with a valve housing 16, a valve member 17, and a pneumatic activating cylinder 18 with a piston rod 19.
  • the valve member 13 of the slide valve 10 consists of two plates with a common interspace, which during operation is kept filled with water.
  • valve housing 10 At the upper edge of the intermediate piece 20 at its end facing the valve housing 10 a sprinkler 21 with a feed pipe 22 for water is built in.
  • the sprinkler 21 is directed such that water supplied through the pipe 22 is conveyed to the area, which is occupied by valve member 13, when the slide valve 10 is closed, as well as to the area of the intermediate piece 20 situated immediately upstream.
  • Valve housings 12 and 16 are made in such a way that their bottoms 23 are positioned somewhat below the bottom 9 of the feed duct 1.
  • the bottoms 23 are provided with drain openings 24 and 25, so that water injected through the nozzle 21 may be drained off through these openings.
  • the gate valve arrangement works in the following way:
  • valve members 13 and 17 are displaced to the open position show in the drawing, and the straw is by means of the piston 2 intermittently pressed through the feed duct 1 to the furnace space 5, in which it is burned.
  • the supply of straw is interrupted at 2, and by means of the piston 3 the straw in the feed duct 1 is pressed so far into the duct as possible.
  • the valve members 13 and 17 are by means of the pneumatic activating cylinders 14 and 18, respectively, brought to their closed positions. Remaining straw, if any, in the valve housings and in the intermediate piece 20 is compressed thereby and may, if the amount of straw is too big, prevent a complete closing of the valve members.
  • the fire in there will gradually spread backwards through the mouth of the feed duct 1, and the straw in the water-cooled duct portion 6 will catch fire.
  • the straw below the valve members is strongly compressed and drenched, the fire will not spread by surface burning in the area between the slide valves, and on account of the heavy drenching burning of the straw in the duct piece 20 is prevented.
  • the closed, water-filled valve member 13 is also sprinkled by water from the spray nozzle 21 and is thereby kept at a temperature so low that the valve member will not be damaged by the burning straw.
  • the valve housing 12 is also cooled, partly by being connected with the water-cooled duct portion 6, partly by water draining off through the drain opening 24.
  • Tests with a gate valve arrangement according to the invention has shown that the fire is stopped so effectively from spreading backwards through the feed duct that it is possible to leave the plant unmanned during operation.
  • the necessaryy control and monitor functions, which among others causes a closing of the slide valves, when required, are of a conventional nature and need no further explanation.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Building Environments (AREA)

Claims (6)

  1. Conduit d'alimentation (1) d'un four de combustion de paille, comportant une soupape à tiroir (10) avec un élément de soupape (13) pour la fermeture du conduit, un dispositif d'arrosage (21) dans une paroi du conduit en amont de la soupape à tiroir, une soupape d'alimentation en eau et une conduite d'alimentation en eau (22) pour le dispositif d'arrosage, et des moyens (14) de contrôle et de commande de l'ouverture et de la fermeture de l'élément de soupape et de la soupape d'alimentation en eau, le dispositif d'arrosage (21) étant situé à proximité de l'élément de soupape (13), caractérisé par le fait que le dispositif d'arrosage (21) est agencé pour arroser d'eau ledit élément de soupape et que le fond (23) du boîtier (12) de la soupape à tiroir (10) est disposé plus bas que le fond (9) du conduit d'alimentation (1) et est pourvu d'ouvertures (24) de drainage d'eau fournie par le dispositif d'arrosage (21).
  2. Conduit d'alimentation selon la revendication 1, caractérisé en ce que l'élément de soupape (13) de la soupape à tiroir (10) est creux et agencé pour être rempli d'eau.
  3. Conduit d'alimentation selon la revendication 2, caractérisé par le fait qu'il comprend des moyens de circulation d'eau de refroidissement dans l'espace interne de l'élément de soupape (21).
  4. Conduit d'alimentation selon une quelconque des revendications précédentes, caractérisé en ce que les moyens de contrôle et de commande de la soupape d'alimentation en eau sont agencés pour alimentation intermittente d'eau au dispositif d'arrosage (21).
  5. Conduit d'alimentation selon une quelconque des revendications précédentes, caractérisé par le fait qu'une seconde soupape à tiroir (11) pour la fermeture du conduit est montée en amont du dispositif d'arrosage, que son boîtier de soupape (16) est pourvu d'ouvertures (25) de drainage d'eau fournie par le dispositif d'arrosage (21) et de moyens de contrôle et de commande d'ouverture et de fermeture des éléments de soupape (17), et par le fait que les moyens de contrôle et de commande des éléments de soupape (13, 17) sont agencés pour fermer simultanément les deux soupapes à tiroir (10, 11).
  6. Conduit d'alimentation selon une quelconque des revendications précédentes, caractérisé en ce que la partie (6) du conduit en aval de la première soupape à tiroir (10) est refroidie à l'eau.
EP19910610095 1990-12-07 1991-12-09 Conduit d'alimentation pour brûler de la paille Expired - Lifetime EP0490804B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK291490A DK166927B1 (da) 1990-12-07 1990-12-07 Indfyringskanal til halmfyr
DK2914/90 1990-12-07

Publications (3)

Publication Number Publication Date
EP0490804A2 EP0490804A2 (fr) 1992-06-17
EP0490804A3 EP0490804A3 (en) 1992-11-19
EP0490804B1 true EP0490804B1 (fr) 1994-07-13

Family

ID=8117067

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910610095 Expired - Lifetime EP0490804B1 (fr) 1990-12-07 1991-12-09 Conduit d'alimentation pour brûler de la paille

Country Status (3)

Country Link
EP (1) EP0490804B1 (fr)
DE (2) DE69102865T2 (fr)
DK (1) DK166927B1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH622079A5 (fr) * 1977-06-17 1981-03-13 Hans Grossniklaus
DE2933786A1 (de) * 1979-08-21 1981-03-12 Gebrüder Prinzing Landmaschinen, 7901 Lonsee Automatische strohofen beschickungsanlage.

Also Published As

Publication number Publication date
DK166927B1 (da) 1993-08-02
EP0490804A2 (fr) 1992-06-17
EP0490804A3 (en) 1992-11-19
DE69102865D1 (de) 1994-08-18
DE490804T1 (de) 1992-11-05
DK291490A (da) 1992-06-08
DE69102865T2 (de) 1995-03-02
DK291490D0 (da) 1990-12-07

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