EP0751348A1 - Device for reducing the visibility of a cloud of smoke from a chimney - Google Patents

Device for reducing the visibility of a cloud of smoke from a chimney Download PDF

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Publication number
EP0751348A1
EP0751348A1 EP95401510A EP95401510A EP0751348A1 EP 0751348 A1 EP0751348 A1 EP 0751348A1 EP 95401510 A EP95401510 A EP 95401510A EP 95401510 A EP95401510 A EP 95401510A EP 0751348 A1 EP0751348 A1 EP 0751348A1
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EP
European Patent Office
Prior art keywords
chimney
plume
gas
less
mouth
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Withdrawn
Application number
EP95401510A
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German (de)
French (fr)
Inventor
Michel Vandycke
Anne Marie c/o Gec Alsthom Stein Ind. Goguey
Jean Michel c/o Gec Alsthom Stein Ind. Gomez
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.)
Alstom Power Boiler SA
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GEC Alsthom Stein Industrie
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Publication date
Application filed by GEC Alsthom Stein Industrie filed Critical GEC Alsthom Stein Industrie
Priority to EP95401510A priority Critical patent/EP0751348A1/en
Publication of EP0751348A1 publication Critical patent/EP0751348A1/en
Withdrawn legal-status Critical Current

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    • 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
    • F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/02—Tops for chimneys or ventilating shafts; Terminals for flues
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J13/00—Fittings for chimneys or flues 

Definitions

  • the present invention relates to a device for reducing the visibility of a plume of gas emitted by a chimney.
  • It relates more precisely to a device for equipping a chimney, in particular an industrial chimney, intended to equip a mouth chimney with a cross section of inscribed diameter D from which a gas plume is evacuated and intended to reduce the visibility of this plume.
  • gases of a combustion system or an industrial process are generally dispersed in the atmosphere by means of a chimney. These gases may contain substances which produce a coloring of the plume of importance proportional to the concentration of coloring substances and to the thickness of the plume.
  • the present invention makes it possible to reduce the visibility of a plume, thanks to a particularly simple device adaptable to all chimneys, even existing ones, requiring no intervention on the upstream combustion plant and low investment cost.
  • the device according to the invention is mounted on the mouth of the chimney and comprises means for deflecting the flow of gas into a tubular plume, the thickness e of this plume at its outlet from the device being less than D / 2.
  • said means comprise an obstruction member centered on the longitudinal axis of the chimney and delimiting with it an annular evacuation space, of width e.
  • said annular space is, in cross section, with an external radius registered R2 and an internal radius registered R1, the difference of these two radii (R2-R1) being less than D / 2.
  • said obstruction member is frustoconical, of reduced section arranged downwards.
  • said obstruction member is conical, with the top disposed downwards.
  • Said obstruction member has an angle at the top ⁇ of between 45 and 140 °
  • the mouth of the chimney is extended by a frustoconical wall flared upwards.
  • the angle ⁇ formed by said frustoconical wall and normal to the wall of the chimney is between 20 and 80 °.
  • Said thickness e is dimensioned, so that the speed of the gas leaving the device is less than 30 m / s.
  • Figure 1 is a view illustrating the visibility of a plume of gas discharged from a conventional chimney.
  • Figure 2 is a view illustrating the visibility of a plume of gas discharged from a chimney equipped with the device according to the invention.
  • Figures 3 and 4 show in longitudinal section two alternative embodiments of the device according to one invention.
  • FIG. 1 represents a chimney 1 with a circular mouth 2 of diameter D or with a polygonal mouth whose inscribed circle is of diameter, called inscribed diameter, equal to D.
  • a gas plume 5 of full shape escapes from this mouth 2.
  • I C x E.
  • Figure 2 shows the same chimney 1 equipped with a device 6 according to the invention.
  • This device 6 is mounted on the mouth 2 and includes means for deflecting the flow of gas into a tubular plume 5 ′, the thickness of this plume at its outlet from the device being less than D / 2, including modes preferred embodiments will be described later.
  • E1 + E2 is less than E and the amplitude of the coloring of the plume thus obtained is less than that of the plume obtained with the chimney 1 not equipped.
  • the concentration is assumed to be constant. However, given the shape of the plume, a greater dispersion of the plume is obtained and the concentration is slightly lower thanks to the equipment device 6 of the chimney, which further decreases the amplitude of the coloring.
  • FIG. 3 is a first alternative embodiment of the equipment device 6.
  • Said deflection means comprise an obstruction member 7 centered on the longitudinal axis of the chimney 1 and delimiting with it an annular evacuation space 8, of width e.
  • This obstructing member 7 is conical, with the apex arranged downwards, with an apex angle ⁇ of between 45 and 140 ° and is held by flat gussets 9 or equivalent on the wall of the chimney 1.
  • FIG. 4 A second alternative embodiment is shown in FIG. 4.
  • Said deflection means comprise an obstructing member 7 centered on the longitudinal axis of the chimney and delimiting with it an annular evacuation space 8, of registered external radius R2 and of registered internal radius R1, the difference of these two radii (R2-R1) being less than D / 2.
  • the obstruction member 7 is frustoconical, of reduced section arranged downwards.
  • the chimney 1 is here extended by a frustoconical wall 11 flared upwards, of angle ⁇ formed with the normal to the wall of the chimney between 20 and 80 °, which channels the flow of the gas flow.
  • This frustoconical wall 11 can be fixed to the top of the chimney 1 by various mechanical means, for example fitting, screwing or the like, and preferably by welding.
  • the dimension e is chosen, in order to obtain a speed of the gas leaving the discharge space 8 of between 6 and 30 m / s.

Abstract

The chimney (1) has a baffle at its discharge opening, shaped to disperse the plume of exhaust smoke into a tubular configuration. The baffle consists of a conical or frusto-conical body (7) located coaxially with the chimney by radially-spaced struts (9) to define an annular discharge opening (8) of a predetermined width (e). The baffle is dimensioned such that the difference between the inner (R1) and outer (R2) radii of the annular opening is less than half the diameter (D) of the chimney. The included angle (7Eb) of the lower end of the conical baffle body is between 45 degrees and 140 degrees . The top edge of the chimney may have a flared wall portion (11) parallel to the sides of the baffle body.

Description

La présente invention se rapporte à un dispositif de réduction de la visibilité d'un panache de gaz émis par une cheminée.The present invention relates to a device for reducing the visibility of a plume of gas emitted by a chimney.

Elle concerne plus précisément un dispositif d'équipement d'une cheminée, en particulier d'une cheminée industrielle, destiné à équiper une cheminée d'embouchure de section de diamètre inscrit D d'où est évacué un panache de gaz et destiné à réduire la visibilité de ce panache.It relates more precisely to a device for equipping a chimney, in particular an industrial chimney, intended to equip a mouth chimney with a cross section of inscribed diameter D from which a gas plume is evacuated and intended to reduce the visibility of this plume.

Les gaz d'un système de combustion ou d'un procédé industriel sont généralement dispersés dans l'atmosphère au moyen d'une cheminée. Ces gaz peuvent contenir des substances qui produisent une coloration du panache d'importance proportionnelle à la concentration en substances colorantes et à l'épaisseur du panache.The gases of a combustion system or an industrial process are generally dispersed in the atmosphere by means of a chimney. These gases may contain substances which produce a coloring of the plume of importance proportional to the concentration of coloring substances and to the thickness of the plume.

Pour réduire ou même éliminer cette coloration du panache, il est classique de réduire la concentration en substances colorantes par exemple par traitement physico-chimique des gaz ou en modifiant les conditions opératoires du procédé qui génère les gaz ou en diluant les gaz avant leur évacuation par la cheminée.To reduce or even eliminate this coloration of the plume, it is conventional to reduce the concentration of coloring substances for example by physico-chemical treatment of the gases or by modifying the operating conditions of the process which generates the gases or by diluting the gases before their evacuation by the fireplace.

Par exemple, dans le cas d'une installation comprenant successivement une turbine à combustion, une chaudière de récupération de chaleur et une cheminée, il est fréquent d'observer un panache de coloration brune dû à la présence de dioxyde d'azote dans les gaz. Pour réduire la visibilité du panache, il est usuel de diminuer la teneur en dioxyde d'azote, soit en traitant les gaz avant leur évacuation grâce à un système de dénitrification catalytique, soit en modifiant les réglages de combustion de la turbine, soit en procédant à une dilution dans de l'air des gaz avant leur évacuation.For example, in the case of an installation successively comprising a combustion turbine, a heat recovery boiler and a chimney, it is frequent to observe a plume of brown coloring due to the presence of nitrogen dioxide in the gases. . To reduce the visibility of the plume, it is usual to reduce the nitrogen dioxide content, either by treating the gases before their evacuation using a catalytic denitrification system, or by modifying the combustion settings of the turbine, or by proceeding dilution in air of the gases before their evacuation.

La présente invention permet de réduire la visibilité d'un panache, grâce à un dispositif particulièrement simple adaptable à toutes cheminées, même existantes, ne nécessitant pas d'intervention sur l'installation de combustion en amont et de faible coût d'investissement.The present invention makes it possible to reduce the visibility of a plume, thanks to a particularly simple device adaptable to all chimneys, even existing ones, requiring no intervention on the upstream combustion plant and low investment cost.

Pour ce faire, le dispositif conforme à l'invention est monté sur l'embouchure de la cheminée et comporte des moyens de déviation de l'écoulement du gaz en un panache tubulaire, l'épaisseur e de ce panache à sa sortie du dispositif étant inférieur à D/2.To do this, the device according to the invention is mounted on the mouth of the chimney and comprises means for deflecting the flow of gas into a tubular plume, the thickness e of this plume at its outlet from the device being less than D / 2.

Selon un mode de réalisation préféré, lesdits moyens comprennent un organe d'obstruction centré sur l'axe longitudinal de la cheminée et délimitant avec elle un espace d'évacuation annulaire, de largeur e.According to a preferred embodiment, said means comprise an obstruction member centered on the longitudinal axis of the chimney and delimiting with it an annular evacuation space, of width e.

Avantageusement, ledit espace annulaire est, en section transversale, de rayon extérieur inscrit R2 et de rayon intérieur inscrit R1, la différence de ces deux rayons (R2-R1) étant inférieure à D/2.Advantageously, said annular space is, in cross section, with an external radius registered R2 and an internal radius registered R1, the difference of these two radii (R2-R1) being less than D / 2.

Selon une première variante, ledit organe d'obstruction est tronconique, de section réduite disposée vers le bas.According to a first variant, said obstruction member is frustoconical, of reduced section arranged downwards.

Selon une seconde variante, ledit organe d'obstruction est conique, de sommet disposé vers le bas.According to a second variant, said obstruction member is conical, with the top disposed downwards.

Ledit organe d'obstruction est d'angle au sommet β compris entre 45 et 140°Said obstruction member has an angle at the top β of between 45 and 140 °

Avantageusement, l'embouchure de la cheminée est prolongée d'une paroi tronconique évasée vers le haut.Advantageously, the mouth of the chimney is extended by a frustoconical wall flared upwards.

L'angle α formé par ladite paroi tronconique et la normale à la paroi de la cheminée est compris entre 20 et 80°.The angle α formed by said frustoconical wall and normal to the wall of the chimney is between 20 and 80 °.

Ladite épaisseur e est dimensionnée, de telle sorte que la vitesse du gaz en sortie du dispositif est inférieure à 30 m/s.Said thickness e is dimensioned, so that the speed of the gas leaving the device is less than 30 m / s.

L'invention est décrite ci-après plus en détail à l'aide de figures ne représentant qu'un mode de réalisation préféré de l'invention.The invention is described below in more detail using figures showing only a preferred embodiment of the invention.

La figure 1 est une vue illustrant la visibilité d'un panache de gaz évacué d'une cheminée classique.Figure 1 is a view illustrating the visibility of a plume of gas discharged from a conventional chimney.

La figure 2 est une vue illustrant la visibilité d'un panache de gaz évacué d'une cheminée équipé du dispositif conforme à l'invention.Figure 2 is a view illustrating the visibility of a plume of gas discharged from a chimney equipped with the device according to the invention.

Les figures 3 et 4 représentent en coupe longitudinale deux variantes de réalisation du dispositif conforme a 1 'invention.Figures 3 and 4 show in longitudinal section two alternative embodiments of the device according to one invention.

La figure 1 représente une cheminée 1 à embouchure circulaire 2 de diamètre D ou à embouchure polygonale dont le cercle inscrit est de diamètre, dit diamètre inscrit, égal à D. Un panache de gaz 5 de forme pleine s'évacue de cette embouchure 2. Un observateur situé au point 3 et regardant le panache 5 dans la direction matérialisée par la ligne 4, observe une coloration d'amplitude I due à une substance colorée contenue dans le gaz et proportionnelle au produit de la concentration moyenne C de la substance colorée dans le gaz et de l'épaisseur E du panache correspondante à la longueur du segment de la ligne 4 coupant celui-ci. Soit I = C x E.

Figure imgb0001
FIG. 1 represents a chimney 1 with a circular mouth 2 of diameter D or with a polygonal mouth whose inscribed circle is of diameter, called inscribed diameter, equal to D. A gas plume 5 of full shape escapes from this mouth 2. An observer located at point 3 and looking at plume 5 in the direction shown by line 4, observes a coloring of amplitude I due to a colored substance contained in the gas and proportional to the product of the average concentration C of the colored substance in the gas and the thickness E of the plume corresponding to the length of the segment of line 4 intersecting it. Let I = C x E.
Figure imgb0001

La figure 2 représente la même cheminée 1 équipé d'un dispositif 6 conforme à l'invention. Ce dispositif 6 est monté sur l'embouchure 2 et comporte des moyens de déviation de l'écoulement du gaz en un panache tubulaire 5', l'épaisseur de ce panache à sa sortie du dispositif étant inférieur à D/2, dont des modes de réalisation préférés seront décrits plus loin.Figure 2 shows the same chimney 1 equipped with a device 6 according to the invention. This device 6 is mounted on the mouth 2 and includes means for deflecting the flow of gas into a tubular plume 5 ′, the thickness of this plume at its outlet from the device being less than D / 2, including modes preferred embodiments will be described later.

Le même observateur situé au point 3 observe une coloration d'amplitude I' proportionnelle au produit de la concentration moyenne C de la substance colorée dans le gaz et de l'épaisseur E1+E2 du panache correspondante à la somme des longueurs des segments de la ligne 4 coupant celui-ci. Soit I' = C x (E1 + E2).

Figure imgb0002
The same observer located at point 3 observes a coloring of amplitude I 'proportional to the product of the average concentration C of the colored substance in the gas and the thickness E1 + E2 of the plume corresponding to the sum of the lengths of the segments of the line 4 intersecting this one. Let I '= C x (E1 + E2).
Figure imgb0002

E1+E2 est inférieur à E et l'amplitude de la coloration du panache ainsi obtenu est inférieure à celle du panache obtenue avec la cheminée 1 non équipée.E1 + E2 is less than E and the amplitude of the coloring of the plume thus obtained is less than that of the plume obtained with the chimney 1 not equipped.

De plus, dans ce calcul, la concentration est supposée constante. Or compte tenu de la forme du panache, on obtient une dispersion plus importante du panache et la concentration est légèrement inférieure grâce au dispositif d'équipement 6 de la cheminée, ce qui diminue encore plus l'amplitude de la coloration.In addition, in this calculation, the concentration is assumed to be constant. However, given the shape of the plume, a greater dispersion of the plume is obtained and the concentration is slightly lower thanks to the equipment device 6 of the chimney, which further decreases the amplitude of the coloring.

La figure 3 est une première variante de réalisation du dispositif d'équipement 6.FIG. 3 is a first alternative embodiment of the equipment device 6.

Lesdits moyens de déviation comprennent un organe d'obstruction 7 centré sur l'axe longitudinal de la cheminée 1 et délimitant avec elle un espace d'évacuation annulaire 8, de largeur e.Said deflection means comprise an obstruction member 7 centered on the longitudinal axis of the chimney 1 and delimiting with it an annular evacuation space 8, of width e.

Cet organe d'obstruction 7 est conique, de sommet disposé vers le bas, d'angle au sommet β compris entre 45 et 140° et est maintenu par des goussets plats 9 ou équivalents sur la paroi de la cheminée 1.This obstructing member 7 is conical, with the apex arranged downwards, with an apex angle β of between 45 and 140 ° and is held by flat gussets 9 or equivalent on the wall of the chimney 1.

Une seconde variante de réalisation est représentée sur la figure 4.A second alternative embodiment is shown in FIG. 4.

Lesdits moyens de déviation comprennent un organe d'obstruction 7 centré sur l'axe longitudinal de la cheminée et délimitant avec elle un espace d'évacuation annulaire 8, de rayon extérieur inscrit R2 et de rayon intérieur inscrit R1, la différence de ces deux rayons (R2-R1) étant inférieure à D/2.Said deflection means comprise an obstructing member 7 centered on the longitudinal axis of the chimney and delimiting with it an annular evacuation space 8, of registered external radius R2 and of registered internal radius R1, the difference of these two radii (R2-R1) being less than D / 2.

L'organe d'obstruction 7 est tronconique, de section réduite disposée vers le bas. La cheminée 1 est ici prolongée d'une paroi tronconique 11 évasée vers le haut, d'angle α formé avec la normale à la paroi de la cheminée compris entre 20 et 80°, qui canalise l'écoulement du flux de gaz. Cette paroi tronconique 11 peut être fixée au sommet de la cheminée 1 par des moyens mécaniques divers, par exemple emboîtage, vissage ou équivalents, et de préférence par soudage.The obstruction member 7 is frustoconical, of reduced section arranged downwards. The chimney 1 is here extended by a frustoconical wall 11 flared upwards, of angle α formed with the normal to the wall of the chimney between 20 and 80 °, which channels the flow of the gas flow. This frustoconical wall 11 can be fixed to the top of the chimney 1 by various mechanical means, for example fitting, screwing or the like, and preferably by welding.

De préférence, la dimension e est choisie, afin d'obtenir un vitesse du gaz en sortie de l'espace d'évacuation 8 comprise entre 6 et 30 m/s.Preferably, the dimension e is chosen, in order to obtain a speed of the gas leaving the discharge space 8 of between 6 and 30 m / s.

Le dispositif conforme à l'invention présente les avantages suivants:

  • simplicité d'installation y compris pour les cheminées existantes,
  • faible coût d'investissement par rapport à un traitement physico-chimique du gaz,
  • absence de maintenance particulière,
  • absence d'interférence significative avec l'installation en amont,
  • faible consommation énergétique en raison de la faible perte de charge du dispositif.
The device according to the invention has the following advantages:
  • simplicity of installation including for existing chimneys,
  • low investment cost compared to a physico-chemical treatment of the gas,
  • no special maintenance,
  • absence of significant interference with the upstream installation,
  • low energy consumption due to the low pressure drop of the device.

Claims (9)

Dispositif d'équipement d'une cheminée (1), en particulier d'une cheminée industrielle, destiné à équiper une cheminée (1) d'embouchure de section de diamètre inscrit D d'où est évacué un panache de gaz (5) et destiné à réduire la visibilité de ce panache (5), caractérisé en ce qu'il est monté sur l'embouchure (2) de la cheminée (1) et comporte des moyens de déviation de l'écoulement du gaz en un panache tubulaire (5'), l'épaisseur e de ce panache (5') à sa sortie du dispositif (6) étant inférieur à D/2.Device for equipping a chimney (1), in particular an industrial chimney, intended to equip a chimney (1) with a mouth of cross-section with a registered diameter D from which a gas plume (5) is evacuated and intended to reduce the visibility of this plume (5), characterized in that it is mounted on the mouth (2) of the chimney (1) and comprises means for deflecting the flow of gas into a tubular plume ( 5 '), the thickness e of this plume (5') on leaving the device (6) being less than D / 2. Dispositif selon la revendication 1, caractérisé en ce que lesdits moyens comprennent un organe d'obstruction (7) centré sur l'axe longitudinal de la cheminée (1) et délimitant avec elle un espace d'évacuation annulaire (8), de largeur e.Device according to claim 1, characterized in that said means comprise an obstruction member (7) centered on the longitudinal axis of the chimney (1) and delimiting with it an annular evacuation space (8), of width e . Dispositif selon la revendication 2, caractérisé en ce que ledit espace annulaire (8) est, en section transversale, de rayon extérieur inscrit R2 et de rayon intérieur inscrit R1, la différence de ces deux rayons (R2-R1) étant inférieure à D/2.Device according to claim 2, characterized in that said annular space (8) is, in cross section, of external radius registered R2 and of internal radius registered R1, the difference of these two radii (R2-R1) being less than D / 2. Dispositif selon la revendication 2 ou 3, caractérisé en ce que ledit organe d'obstruction (7) est tronconique, de section réduite disposée vers le bas.Device according to claim 2 or 3, characterized in that said obstruction member (7) is frustoconical, of reduced section arranged downwards. Dispositif selon la revendication 2 ou 3, caractérisé en ce que ledit organe d'obstruction (7) est conique, de sommet disposé vers le bas.Device according to claim 2 or 3, characterized in that said obstruction member (7) is conical, with the top disposed downwards. Dispositif selon la revendication 4 ou 5, caractérisé en ce que ledit organe d'obstruction (7) est d'angle au sommet β compris entre 45 et 140°.Device according to claim 4 or 5, characterized in that said obstruction member (7) has an angle at the apex β of between 45 and 140 °. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'embouchure (2) de la cheminée (1) est prolongée d'une paroi tronconique (11) évasée vers le haut.Device according to one of the preceding claims, characterized in that the mouth (2) of the chimney (1) is extended by a frustoconical wall (11) flared upwards. Dispositif selon la revendication 7, caractérisé en ce que l'angle α formé par ladite paroi tronconique (11) et la normale à la paroi de la cheminée (1) est compris entre 20 et 80°.Device according to claim 7, characterized in that the angle α formed by said frustoconical wall (11) and normal to the wall of the chimney (1) is between 20 and 80 °. Dispositif selon l'une des revendications précédentes, caractérisé en ce que ladite épaisseur e est dimensionnée, de telle sorte que la vitesse du gaz en sortie du dispositif (6) est inférieure à 30 m/s.Device according to one of the preceding claims, characterized in that said thickness e is dimensioned, so that the speed of the gas leaving the device (6) is less than 30 m / s.
EP95401510A 1995-06-26 1995-06-26 Device for reducing the visibility of a cloud of smoke from a chimney Withdrawn EP0751348A1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1714080A1 (en) * 2004-01-20 2006-10-25 Greenheck Fan Corporation Exhaust fan assembly
US8647182B2 (en) 2004-01-20 2014-02-11 Greenheck Fan Corporation Exhaust fan assembly
RU2507449C2 (en) * 2012-04-24 2014-02-20 Леонид Николаевич Парфенов Flare candle unit
RU182780U1 (en) * 2018-03-12 2018-08-31 Общество с ограниченной ответственностью "Газпром проектирование" Discharge pipe head

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Publication number Priority date Publication date Assignee Title
FR941361A (en) * 1946-02-04 1949-01-10 Sulzer Ag Protective device for pipe outlet
JPS5944517A (en) * 1982-09-06 1984-03-13 Toyo Eng Corp Chimney
DE3607560A1 (en) * 1985-03-11 1986-09-18 Aktiebolaget Tore J. Hedbäck, Danderyd Arrangement for regulating the outlet rate of the smoke gases in a chimney

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR941361A (en) * 1946-02-04 1949-01-10 Sulzer Ag Protective device for pipe outlet
JPS5944517A (en) * 1982-09-06 1984-03-13 Toyo Eng Corp Chimney
DE3607560A1 (en) * 1985-03-11 1986-09-18 Aktiebolaget Tore J. Hedbäck, Danderyd Arrangement for regulating the outlet rate of the smoke gases in a chimney

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Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 148 (M - 308) 11 July 1984 (1984-07-11) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1714080A1 (en) * 2004-01-20 2006-10-25 Greenheck Fan Corporation Exhaust fan assembly
EP1714080A4 (en) * 2004-01-20 2009-06-24 Greenheck Fan Corp Exhaust fan assembly
US8647182B2 (en) 2004-01-20 2014-02-11 Greenheck Fan Corporation Exhaust fan assembly
US9636722B2 (en) 2004-01-20 2017-05-02 Greenheck Fan Corporation Exhaust fan assembly
RU2507449C2 (en) * 2012-04-24 2014-02-20 Леонид Николаевич Парфенов Flare candle unit
RU182780U1 (en) * 2018-03-12 2018-08-31 Общество с ограниченной ответственностью "Газпром проектирование" Discharge pipe head

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