EP0141073B1 - Method of increasing the degree of separation in a cyclone, and cyclone for carrying out said method - Google Patents

Method of increasing the degree of separation in a cyclone, and cyclone for carrying out said method Download PDF

Info

Publication number
EP0141073B1
EP0141073B1 EP84109299A EP84109299A EP0141073B1 EP 0141073 B1 EP0141073 B1 EP 0141073B1 EP 84109299 A EP84109299 A EP 84109299A EP 84109299 A EP84109299 A EP 84109299A EP 0141073 B1 EP0141073 B1 EP 0141073B1
Authority
EP
European Patent Office
Prior art keywords
cyclone
particles
gas
separation
degree
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
Application number
EP84109299A
Other languages
German (de)
French (fr)
Other versions
EP0141073A3 (en
EP0141073A2 (en
Inventor
Roine Dipl.-Ing. Brännström
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.)
ABB Stal AB
Original Assignee
Asea Stal AB
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 Asea Stal AB filed Critical Asea Stal AB
Priority to AT84109299T priority Critical patent/ATE48246T1/en
Publication of EP0141073A2 publication Critical patent/EP0141073A2/en
Publication of EP0141073A3 publication Critical patent/EP0141073A3/en
Application granted granted Critical
Publication of EP0141073B1 publication Critical patent/EP0141073B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks

Definitions

  • the present invention relates to a method for increasing the degree of separation of a cyclone according to the preamble of claim 1 and a cyclone separator for performing the method.
  • the degree of separation of a cyclone depends to a large extent on the rate of entry into the cyclone and on the size of the particles. The greater the entry speed, the greater the degree of separation. Small particles are more difficult to separate than large ones. This is due to the fact that small particles have a low falling speed and are more easily entrained with the air flow into the central part of the cyclone.
  • the invention has for its object to develop a method according to the preamble of claim 1 and bushing arrangement, which has a significantly greater degree of separation, without this resulting in the shortening of the service life due to increased inlet speeds of the gas at the inlet of the cyclone.
  • a cyclone separator for performing the method is characterized according to the invention by the features mentioned in claims 5 and 6.
  • the particles in the transport gas are braked or brought to a standstill at a certain distance before entering the cyclone. Behind this braking point, the particles are accelerated again by the transport gas. The large, heavy particles are accelerated more slowly than the small, light particles.
  • a desired “speed profile” can be achieved for the particles at the entrance to the cyclone.
  • This distance is chosen so that the particles, the size of which is above a certain value and which consequently have a large erosion effect, get a speed which does not exceed approx. 20 m / s.
  • the smallest particles are quickly accelerated to the speed of the transport gas. Due to the high entry speed, a better degree of separation for small particles and an equally good degree of separation for large particles are obtained compared to known cleaning systems. The total degree of separation is thus increased without increasing the erosion and the associated loss in the life of the cyclone.
  • the particles can be braked in a T-shaped branch pipe, which is connected to the cyclone inlet with the part corresponding to the vertical bar of the “T”.
  • the crossbar of the "T” is connected at one end to the transport line, while the other end is closed with a cover and forms a blind space.
  • a “cushion” consisting of particles collects in this blind space, which forms a braking impact surface and prevents direct contact of the flowing particles with the material of the branch pipe and thus prevents erosion thereof. It goes without saying that the part of the branch pipe corresponding to the crossbar of the “T” can have ends of different lengths.
  • the invention can be used, for example, in an incineration plant with a pressurized fluidized bed (PFBC plant) and gas turbines which are driven by the combustion gases of the plant.
  • PFBC plant pressurized fluidized bed
  • gas turbines which are driven by the combustion gases of the plant.
  • the pressure vessel can be made smaller. The investment costs are significantly reduced.
  • the pressure drop caused by the deflection in the T-shaped branch pipes is compensated for by a smaller number of cyclones connected in series.
  • 1 denotes a cyclone
  • the gas containing particles through the transport line 2 is fed.
  • the particles e.g. B. dust that is entrained by the combustion gases that a pressurized fluidized bed of an incinerator, for. B. a power plant, leave in the transport line 2 essentially the same speed as the transport gas.
  • gas and particles have the same speed when they enter the cyclone 1.
  • Particularly coarse particles cause strong erosion in the section of the wall of the cyclone denoted by 3 at a high entry speed.
  • the limit for the entry speed is usually between 15 and 20 m / s.
  • a T-shaped branch pipe 4 with its part 5 corresponding to the vertical bar of the “T” is connected to the inlet of the cyclone 1, while the transport line is connected to part 6 of the branch pipe.
  • Part 7 of the branch pipe is closed with a cover 8 and forms a blind space 9 which fills with particles which form a brake pad on which the particles located in the transport line are braked.
  • a suitable “speed profile” can be obtained for the particle mass in the gas stream . This makes it possible to use gas speeds of 50 m / s and more, but at the same time limit the speed of the larger particles to less than 15 to 20 m / s, which is desirable in view of erosion.
  • Line 10 shows the speed of the transport gas in transport line 2 and in the branch pipe.
  • the particle speed is represented by curve 11, which shows a “speed profile” of the particles. It can be seen from the curve that the particle speed decreases with increasing particle size.
  • the shape and position of the curve depend on the length x of the pipe branch 5 of the branch pipe. With a longer length x, the curve is shifted to the top right, as shown by arrow 12.
  • the dashed curves 11a and 11b show speed profiles with a greater or smaller length x of the part 5 of the branch pipe 5.
  • the dashed line 13 denotes the normal entry speed for gas and particles in a conventional cyclone construction. As can be seen from curve 11, the entry speed of the larger particles is below line 13, which is desirable in terms of erosion and service life.
  • the cyclone separator according to the invention is extremely valuable for the separation of bed material or ash from the transport gas of a PFBC plant with a bed and ash discharge device of the type described in EP-A-83 306 073.4.
  • the cyclone separator is arranged at the outlet end of the discharge device between the latter and a collecting container for separated material.
  • ash extraction devices of the type mentioned it is expedient to work at high transport speeds, for example 50-60 m / s. Direct introduction of the particle-containing gas into a cyclone at this high speed would result in unsustainable erosion and thus shorten the life of the cyclone.
  • the invention achieves both an acceptable wear of the cyclone and a high degree of separation for fine particles.

Landscapes

  • Cyclones (AREA)

Abstract

The separating efficiency of a cyclone separator used for removing solid particles from a gas stream (for example ash particles from the combustion gas which is passed to a gas turbine) is increased by retarding the particles before they arrive at the cyclone and thereafter accelerating them over a short distance before they enter the cyclone. In this way large particles will have a lower speed than small particles when entering the cyclone. Despite a high velocity of the transport gas and a high inlet velocity for small particles, it is possible to obtain an inlet velocity for larger particles which is desirably low from the point of view of reducing erosion of the cyclone separator. The separation of fine particles is improved. The retardation of the particles may take place in a T-shaped branch pipe, which has one branch connected to the cyclone, a second branch connected to a conveying pipe and a third branch which is formed as a blind space.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Erhöhung des Abscheidungsgrades eines Zyklons gemäß dem Oberbegriff des Anspruches 1 sowie einen Zyklonenabscheider zur Durchführung des Verfahrens.The present invention relates to a method for increasing the degree of separation of a cyclone according to the preamble of claim 1 and a cyclone separator for performing the method.

Der Abscheidungsgrad eines Zyklons ist in hohem Maße von der Eintrittsgeschwindigkeit in den Zyklon und von der Größe der Partikel abhängig. Je größer die Eintrittsgeschwindigkeit, um so größer ist der Abscheidungsgrad. Kleine Partikel sind schwerer abzuscheiden als große. Dies hängt damit zusammen, daß kleine Partikel eine niedrige Fallsgeschwindigkeit haben und leichter mit dem Luftstrom in den zentralen Teil des Zyklons mitgerissen werden.The degree of separation of a cyclone depends to a large extent on the rate of entry into the cyclone and on the size of the particles. The greater the entry speed, the greater the degree of separation. Small particles are more difficult to separate than large ones. This is due to the fact that small particles have a low falling speed and are more easily entrained with the air flow into the central part of the cyclone.

Um den Abscheidungsgrad zu erhöhen, ist es naheliegend, die Eintrittsgeschwindigkeit in den Zyklon zu erhöhen. Dies hat jedoch bei einer Anlage bekannter Ausführung folgende nachteilige Wirkungen:

  • 1. Der Druckabfall wird größer.
  • 2. Die Erosion an der Mantelfäche des Zyklons nimmt zu. Diese Erosion wird zum überwiegenden Teil durch die größeren Partikel verursacht. Der erhöhte Druckabfall ist häufig akzeptierbar; dagegen führt die Erosion bei einer Erhöhung der Strömungsgeschwindigkeit zu einer drastischen Verkürzung der Lebensdauer des Zyklons. Daher werden im allgemeinen keine höheren Eintrittsgeschwindigkeiten als 20 bis 30 m/s angewendet.
In order to increase the degree of separation, it is obvious to increase the rate of entry into the cyclone. However, this has the following adverse effects in a system of known design:
  • 1. The pressure drop increases.
  • 2. The erosion on the surface of the cyclone increases. This erosion is mainly caused by the larger particles. The increased pressure drop is often acceptable; on the other hand, the erosion leads to a drastic shortening of the lifespan of the cyclone when the flow velocity increases. Therefore, entry velocities higher than 20 to 30 m / s are generally not used.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren gemäß dem Oberbegriff des Anspruches 1 nebst Durchführungsanordnung zu entwikkein, das einen erheblich größeren Abscheidungsgrad hat, ohne daß dadurch die genannte Verkürzung der Lebensdauer durch erhöhte Eintrittsgeschwindigkeiten des Gases am Eintritt des Zyklons eintritt.The invention has for its object to develop a method according to the preamble of claim 1 and bushing arrangement, which has a significantly greater degree of separation, without this resulting in the shortening of the service life due to increased inlet speeds of the gas at the inlet of the cyclone.

Zur Lösung dieser Aufgabe wird ein Verfahren gemäß dem Oberbegriff des Anspruches 1 vorgeschlagen, welches erfindungsgemäß die im kennzeichnenden Teil des Anspruches 1 genannten Merkmale hat.To achieve this object, a method is proposed according to the preamble of claim 1, which according to the invention has the features mentioned in the characterizing part of claim 1.

Vorteilhafte Ausgestaltungen des Verfahrens gemäß der Erfindung sind in den Ansprüchen 2 bis 4 genannt.Advantageous embodiments of the method according to the invention are mentioned in claims 2 to 4.

Ein Zyklonenabscheider zur Durchführung des Verfahrens ist gemäß der Erfindung durch die in den Ansprüchen 5 und 6 genannten Merkmale gekennzeichnet.A cyclone separator for performing the method is characterized according to the invention by the features mentioned in claims 5 and 6.

Gemäß der Erfindung werden die Partikel in dem Transportgas in einem gewissen Abstand vor dem Eintritt in den Zyklon gebremst bzw. zum Stillstand gebracht. Hinter dieser Bremsstelle werden die Partikel von dem Transportgas erneut beschleunigt. Dabei werden die großen, schweren Partikel langsamer als die kleinen, leichten Partikel beschleunigt.According to the invention, the particles in the transport gas are braked or brought to a standstill at a certain distance before entering the cyclone. Behind this braking point, the particles are accelerated again by the transport gas. The large, heavy particles are accelerated more slowly than the small, light particles.

Durch Anordnung der Bremsstelle in einem geeigneten Abstand von dem Eingang des Zyklons kann ein gewünschtes «Geschwindigkeitsprofil» für die Partikel am Eingang in den Zyklon erreicht werden. Dieser Abstand wird so gewählt, daß die Partikel, deren Größe oberhalb eines bestimmten Wertes liegt und die folglich eine große Erosionswirkung haben, eine Geschwindigkeit bekommen, die ca. 20 m/s nicht übersteigt. Die kleinsten Partikel werden schnell auf die Geschwindigkeit des Transportgases beschleunigt. Durch die hohe Eintrittsgeschwindigkeit erhält man im Vergleich zu bekannten Reinigungsanlagen einen besseren Abscheidungsgrad für kleine Partikel und einen gleich guten Abscheidungsgrad für große Partikel. Der Gesamtabscheidungsgrad wird also vergrößert, ohne daß die Erosion und der damit verbundene Verlust an Lebensdauer des Zyklons steigen.By arranging the braking point at a suitable distance from the entrance to the cyclone, a desired “speed profile” can be achieved for the particles at the entrance to the cyclone. This distance is chosen so that the particles, the size of which is above a certain value and which consequently have a large erosion effect, get a speed which does not exceed approx. 20 m / s. The smallest particles are quickly accelerated to the speed of the transport gas. Due to the high entry speed, a better degree of separation for small particles and an equally good degree of separation for large particles are obtained compared to known cleaning systems. The total degree of separation is thus increased without increasing the erosion and the associated loss in the life of the cyclone.

Das Abbremsen der Partikel kann in einem T-förmigen Abzweigrohr geschehen, welches mit dem dem senkrechten Balken des «T»s entsprechenden Teil an den Eingang des Zyklons angeschlossen ist. Der Querbalken des «T»s ist mit seinem einen Ende an die Transportleitung angeschlossen, während das andere Ende mit einem Deckel verschlossen ist und einen Blindraum bildet. In diesem Blindraum sammelt sich ein aus Partikeln bestehendes «Kissen», das eine bremsende Aufprallfläche bildet und einen Direktkontakt der strömenden Partikel mit dem Material des Abzweigrohres und somit eine Erosion desselben verhindert. Es versteht sich, daß der dem Querbalken des «T»s entsprechende Teil des Abzweigrohrs unterschiedlich lange Enden haben kann.The particles can be braked in a T-shaped branch pipe, which is connected to the cyclone inlet with the part corresponding to the vertical bar of the “T”. The crossbar of the "T" is connected at one end to the transport line, while the other end is closed with a cover and forms a blind space. A “cushion” consisting of particles collects in this blind space, which forms a braking impact surface and prevents direct contact of the flowing particles with the material of the branch pipe and thus prevents erosion thereof. It goes without saying that the part of the branch pipe corresponding to the crossbar of the “T” can have ends of different lengths.

Die Erfindung kann beispielsweise in einer Verbrennungsanlage mit einem unter Druck stehenden Wirbelbett (PFBC-Anlage) und Gasturbinen, die mit den Verbrennungsgasen der Anlage angetrieben werden, verwendet werden. Hier ist es erforderlich, die den Verbrennungsgasen folgenden Partikel gründlich abzuscheiden, um Erosionsschäden in den Turbinen zu verhindern. Bei der Anwendung der Erfindung kann man entweder die Anzahl der in Reihe geschalteten Reinigungsstufen beibehalten und somit einen höheren Reinigungsgrad erhalten, oder man kann die Anzahl der in Reihe geschalteten Reinigungsstufen bei gleichbleibendem Reinigungsgrad verringern. Im letztgenannten Fall sind weniger Zyklone erforderlich, und es wird auch weniger Platz für die Zyklone benötigt. Der Druckbehälter kann kleiner ausgeführt werden. Die Anlagekosten werden erheblich reduziert. Der Druckabfall, den die Ablenkung in den T-förmigen Abzweigrohren verursacht, wird durch eine kleinere Anzahl der in Reihe geschalteten Zyklone kompensiert.The invention can be used, for example, in an incineration plant with a pressurized fluidized bed (PFBC plant) and gas turbines which are driven by the combustion gases of the plant. Here it is necessary to thoroughly separate the particles following the combustion gases in order to prevent erosion damage in the turbines. When using the invention, one can either maintain the number of cleaning stages connected in series and thus obtain a higher degree of cleaning, or one can reduce the number of cleaning stages connected in series with the same degree of cleaning. In the latter case, fewer cyclones are required and less space is required for the cyclones. The pressure vessel can be made smaller. The investment costs are significantly reduced. The pressure drop caused by the deflection in the T-shaped branch pipes is compensated for by a smaller number of cyclones connected in series.

Anhand der in den Figuren gezeigten Ausführungsbeispiele soll die Erfindung näher erläutert werden. Es zeigen

  • Figur 1 einen bekannten Zyklon im horizontalen Schnitt,
  • Figur 2 einen entsprechenden Schnitt durch ein Ausführungsbeispiel eines Zyklons gemäß der Erfindung,
  • Figur 3 ein Diagramm zur Veranschaulichung der Wirkungsweise der Erfindung.
The invention will be explained in more detail with reference to the exemplary embodiments shown in the figures. Show it
  • 1 shows a known cyclone in horizontal section,
  • FIG. 2 shows a corresponding section through an exemplary embodiment of a cyclone according to the invention,
  • Figure 3 is a diagram illustrating the operation of the invention.

In den Figuren bezeichnet 1 einen Zyklon, dem partikelhaltiges Gas durch die Transportleitung 2 zugeführt wird. Die Partikel, z. B. Staub, die von den Verbrennungsgasen mitgerissen werden, die ein unter Druck stehendes Wirbelbett einer Verbrennungsanlage, z. B. einer Kraftwerksanlage, verlassen, haben in der Transportleitung 2 im wesentlichen dieselbe Geschwindigkeit wie das Transportgas. Bei der bekannten Ausführungsform gemäß Fig. 1, bei der die Transportleitung tangential direkt im Zyklon 1 mündet, haben Gas und Partikel beim Eintritt in den Zyklon 1 dieselbe Geschwindigkeit. Besonders grobe Partikel bewirken bei hoher Eintrittsgeschwindigkeit eine starke Erosion in dem mit 3 bezeichnet Abschnitt der Wand des Zyklons. Aus praktischen Gründen, nämlich mit Rücksicht auf die Lebensdauer, liegt die Grenze für die Eintrittsgeschwindigkeit gewöhnlich zwischen 15 und 20 m/s. Bei dieser Eintrittsgeschwindigkeit ist die erzielte Abscheidung kleiner Partikel nicht zufriedenstellend. Bei der Ausführungsform der Reinigungsanlage gemäß der Erfindung ist ein T-förmiges Abzweigrohr 4 mit seinem dem senkrechten Balken des «T»s entsprechenden Teil 5 an den Eingang des Zyklon 1 angeschlossen, während die Transportleitung an den Teil 6 des Abzweigrohres angeschlossen ist. Der Teil 7 des Abzweigrohres ist mit einem Deckel 8 verschlossen und bildet einen Blindraum 9, der sich mit Partikel füllt, die ein Bremskissen bilden, an dem die in der Transportleitung befindlichen Partikel gebremst werden. Nach dem Bremsen werden die Partikel in dem Rohrzweig 5 des Abzweigrohres beschleunigt. Kleine Partikel werden dabei schneller beschleunigt als große. Dadurch, daß man die Länge x Rohrzweigs 5 zweckmäßig im Verhältnis zu der Partikelbelastung, der Partikelgrößenverteilung, der Partikeldichte, dem Druck des Transportgases, der Temperatur, der Viskosität usw. wählt, kann man ein geeignetes «Geschwindigkeitsprofil» für die Partikelmasse in dem Gasstrom erhalten. Dadurch ist es möglich, Gasgeschwindigkeiten von 50 m/s und mehr anzuwenden, gleichzeitig aber die Geschwindigkeit der größeren Partikel auf weniger als 15 bis 20 m/ s zu begrenzen, was mit Rücksicht auf die Erosion wünschenswert ist.In the figures, 1 denotes a cyclone, the gas containing particles through the transport line 2 is fed. The particles, e.g. B. dust that is entrained by the combustion gases that a pressurized fluidized bed of an incinerator, for. B. a power plant, leave in the transport line 2 essentially the same speed as the transport gas. In the known embodiment according to FIG. 1, in which the transport line opens tangentially directly into the cyclone 1, gas and particles have the same speed when they enter the cyclone 1. Particularly coarse particles cause strong erosion in the section of the wall of the cyclone denoted by 3 at a high entry speed. For practical reasons, namely with regard to the service life, the limit for the entry speed is usually between 15 and 20 m / s. At this entry speed, the separation of small particles is unsatisfactory. In the embodiment of the cleaning system according to the invention, a T-shaped branch pipe 4 with its part 5 corresponding to the vertical bar of the “T” is connected to the inlet of the cyclone 1, while the transport line is connected to part 6 of the branch pipe. Part 7 of the branch pipe is closed with a cover 8 and forms a blind space 9 which fills with particles which form a brake pad on which the particles located in the transport line are braked. After braking, the particles in the pipe branch 5 of the branch pipe are accelerated. Small particles are accelerated faster than large ones. By appropriately choosing the length x tube branch 5 in relation to the particle load, the particle size distribution, the particle density, the pressure of the transport gas, the temperature, the viscosity, etc., a suitable “speed profile” can be obtained for the particle mass in the gas stream . This makes it possible to use gas speeds of 50 m / s and more, but at the same time limit the speed of the larger particles to less than 15 to 20 m / s, which is desirable in view of erosion.

Die Wirkung der Erfindung wird aus Figur 3 deutlich. Die Geschwindigkeit des Transportgases in der Transportleitung 2 und in dem Abzweigrohr zeigt die Linie 10. Die Partikelgeschwindigkeit wird durch die Kurve 11 dargestellt, die ein «Geschwindigkeitsprofil» der Partikel zeigt. Aus der Kurve ersieht man, daß die Partikelgeschwindigkeit mit zunehmender Partikelgröße kleiner wird. Die Form und die Lage der Kurve sind von der Länge x des Rohrzweig 5 des Abzweigrohres abhängig. Bei größerer Länge x wird die Kurve nach rechts oben verschoben, so wie es Pfeil 12 zeigt. Die gestrichelten Kurven 11a bzw. 11b zeigen Geschwindigkeitsprofile bei größerer bzw. kleinerer Länge x des Teils 5 des Abzweigrohres 5. Die gestrichelte Linie 13 bezeichnet die normale Eintrittsgeschwindigkeit für Gas und Partikel bei einer konventionellen Zyklonenkonstruktion. Wie aus der Kurve 11 hervorgeht, liegt die Eintrittsgeschwindigkeit der größeren Partikel unter der Linie 13, was im Hinblick auf die Erosion und die Lebensdauer erwünscht ist.The effect of the invention is clear from Figure 3. Line 10 shows the speed of the transport gas in transport line 2 and in the branch pipe. The particle speed is represented by curve 11, which shows a “speed profile” of the particles. It can be seen from the curve that the particle speed decreases with increasing particle size. The shape and position of the curve depend on the length x of the pipe branch 5 of the branch pipe. With a longer length x, the curve is shifted to the top right, as shown by arrow 12. The dashed curves 11a and 11b show speed profiles with a greater or smaller length x of the part 5 of the branch pipe 5. The dashed line 13 denotes the normal entry speed for gas and particles in a conventional cyclone construction. As can be seen from curve 11, the entry speed of the larger particles is below line 13, which is desirable in terms of erosion and service life.

Der Zyklonenabscheider gemäß der Erfindung ist außerordentlich wertvoll für die Abscheidung von Bettmaterial oder Asche aus dem Transportgas einer PFBC-Anlage mit einer Bett- und Ascheausschubvorrichtung der Art, wie sie in der EP-A-83 306 073.4 beschrieben wird. Der Zyklonenabscheider wird an dem Austrittsende der Ausschubvorrichtung zwischen dieser und einem Sammelbehälter für abgeschiedenes Material angeordnet. Bei der Verwendung von Ascheausschubvorrichtungen der genannten Art ist es zweckmäßig, mit hohen Transportgeschwindigkeiten, beispielsweise 50-60 m/s, zu arbeiten. Ein direktes Einführen des partikelhaltigen Gases in einen Zyklon mit dieser hohen Geschwindigkeit würde eine nicht tragbare Erosion und damit Verkürzung der Lebensdauer des Zyklons zur Folge haben. Durch die Erfindung wird sowohl ein annehmbarer Verschleiß des Zyklons als auch ein hoher Abscheidungsgrad für feine Partikel erreicht.The cyclone separator according to the invention is extremely valuable for the separation of bed material or ash from the transport gas of a PFBC plant with a bed and ash discharge device of the type described in EP-A-83 306 073.4. The cyclone separator is arranged at the outlet end of the discharge device between the latter and a collecting container for separated material. When using ash extraction devices of the type mentioned, it is expedient to work at high transport speeds, for example 50-60 m / s. Direct introduction of the particle-containing gas into a cyclone at this high speed would result in unsustainable erosion and thus shorten the life of the cyclone. The invention achieves both an acceptable wear of the cyclone and a high degree of separation for fine particles.

Claims (6)

1. Method of increasing the degree of separation in a cyclone, characterized in that the flow of particle-containing gases is deflected prior to their inflow into the cyclone (1) such that the particles are retarded, and that the particles are subsequently accelerated along a transport distance between the deflection region and the inlet of the cyclone in such a way that the larger particles have a lower speed at the inlet into the separator than the smaller particles.
2. Method according to claim 1, characterized in that the flowing particle-containing gas is deflected by an angle of about 90 degree.
3. Method according to claim 2, characterized in that the deflection occurs in a T-shaped branch pipe (4) which is provided with a blind space (9) in which a column of powder has been built up forming a retarding deflection surface for the particles in the deflection region.
4. Method according to any of the preceding claims, characterized in that it is applied to a discharge equipment for bed material and ashes in a PFBC-plant for separating bed material or ashes from the transport gas.
5. Cyclone separator for carrying out the method according to any of the preceding claims, characterized in that the supply pipe to the cyclone is provided with a T-shaped branch pipe which is connected to the inlet of the cyclone (1) with the part (5) corresponding the vertical prong of the "T".
6. Cyclone separator according to claim 5, characterized in that it forms part of a discharge equipment for bed material and ashes in a PFBC-plant for separating bed material or ashes from the transport gas.
EP84109299A 1983-08-16 1984-08-06 Method of increasing the degree of separation in a cyclone, and cyclone for carrying out said method Expired EP0141073B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84109299T ATE48246T1 (en) 1983-08-16 1984-08-06 METHOD OF INCREASING THE SEPARATION EFFICIENCY OF A CYCLONE AND CYCLONE SEPARATORS FOR IMPLEMENTING THE METHOD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8304429A SE437943B (en) 1983-08-16 1983-08-16 SET TO OK A CYCLE'S SEPARATION DEGREE AND CYCLE DISPENSER FOR IMPLEMENTATION OF THE SET
SE8304429 1983-08-16

Publications (3)

Publication Number Publication Date
EP0141073A2 EP0141073A2 (en) 1985-05-15
EP0141073A3 EP0141073A3 (en) 1988-03-30
EP0141073B1 true EP0141073B1 (en) 1989-11-29

Family

ID=20352208

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84109299A Expired EP0141073B1 (en) 1983-08-16 1984-08-06 Method of increasing the degree of separation in a cyclone, and cyclone for carrying out said method

Country Status (6)

Country Link
US (1) US4606739A (en)
EP (1) EP0141073B1 (en)
JP (1) JPS6061060A (en)
AT (1) ATE48246T1 (en)
DE (1) DE3480591D1 (en)
SE (1) SE437943B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10231546B2 (en) 2017-03-02 2019-03-19 Knoll, Inc. Chair back tilt mechanism

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE468240B (en) * 1991-12-23 1992-11-30 Kamyr Ab SETTING AND CYCLONING DEVICE TO DISABLE Foam Formation
US5660282A (en) * 1993-04-29 1997-08-26 Evergreen Global Resources, Inc. Method and apparatus for separating resource materials from solid waste
US6936086B2 (en) * 2002-09-11 2005-08-30 Planar Systems, Inc. High conductivity particle filter
DE502008002099D1 (en) * 2007-08-07 2011-02-03 Polysius Ag DEVICE FOR IMPLEMENTING CHEMICAL AND / OR PHYSICAL REACTIONS BETWEEN A SOLID AND A GAS
AT505750B1 (en) * 2007-12-21 2009-04-15 Siemens Vai Metals Tech Gmbh METHOD AND DEVICE FOR THE SOLUBLE DEPOSITION OF SOLID PARTICLES FROM SOLID-LOADED GASES
BR112022017785A2 (en) * 2020-03-06 2022-10-25 Metso Outotec Finland Oy CYCLONE SEPARATOR ARRANGEMENT

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1469702A (en) * 1923-10-02 Air-cleaning attachment eor automobile carburetors
US2056022A (en) * 1936-01-18 1936-09-29 Gen Electric Flow controlling device for refrigerating systems
US2311868A (en) * 1940-10-01 1943-02-23 Armentrout Arthur L Apparatus for controlling the flow of fluids
US2718754A (en) * 1951-06-30 1955-09-27 Exxon Research Engineering Co Combustion system for combustion gas turbines
US3146998A (en) * 1960-10-22 1964-09-01 Kloeckner Humboldt Deutz Ag Method and apparatus for preheating of fine-grain material
DE2440888C3 (en) * 1974-08-27 1978-11-23 Waeschle Maschinenfabrik Gmbh, 7980 Ravensburg System for the successive loading of several unloading stations connected one behind the other to a pneumatic conveying line via separators with bulk material
US3974572A (en) * 1975-01-16 1976-08-17 Aluminium Pechiney Process and heat exchanger for continuous circulation of fluidized powder in heat exchange with a hot gas
SU761539A1 (en) * 1977-01-24 1980-09-07 Uk Nii Oroshaemogo Zemledeliya Unit for irrigating water melioration
US4267048A (en) * 1979-03-12 1981-05-12 Oishikikai Mfg. Co., Ltd. Equipment for separating foreign matter from liquid papermaking materials
US4288235A (en) * 1979-07-06 1981-09-08 Stone & Webster Engineering Corporation Low residence time solid-gas separation device and system
JPS5624530U (en) * 1979-07-31 1981-03-05
JPS56137751U (en) * 1980-03-14 1981-10-19
SE8004924L (en) * 1980-07-03 1982-01-04 Stal Laval Turbin Ab ASKYLARE FOR SWEET BED CHAMBER
JPS5821549U (en) * 1981-08-04 1983-02-09 岸本産業株式会社 Sealing medical drug containers
US4504291A (en) * 1983-06-29 1985-03-12 Mobil Oil Corporation Dropout boot for power recovery train

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10231546B2 (en) 2017-03-02 2019-03-19 Knoll, Inc. Chair back tilt mechanism

Also Published As

Publication number Publication date
SE8304429D0 (en) 1983-08-16
ATE48246T1 (en) 1989-12-15
JPS6061060A (en) 1985-04-08
SE437943B (en) 1985-03-25
US4606739A (en) 1986-08-19
DE3480591D1 (en) 1990-01-04
EP0141073A3 (en) 1988-03-30
SE8304429L (en) 1985-02-17
EP0141073A2 (en) 1985-05-15
JPH0446623B2 (en) 1992-07-30

Similar Documents

Publication Publication Date Title
DE2948168C2 (en) Centrifugal separator for solid particles suspended in a gas stream
DE970433C (en) Method and device for the removal of finely divided suspended matter from gases
EP0461695B1 (en) Process and apparatus for cleaning dust-laden and noxious exhaust gases
DE2538193C2 (en) Nozzles of a device for gas distribution for fluidized beds
DE1542314C3 (en) Method and device for removing sulfur oxides from exhaust gases
DE2925245A1 (en) METHOD FOR SEPARATING PARTICLE-SHAPED MATERIALS FROM A GAS FLOW
DE2731696A1 (en) METHOD AND DEVICE FOR SELECTIVELY GRINDING PARTICLES MADE OF BREAKABLE MATERIAL
EP0141073B1 (en) Method of increasing the degree of separation in a cyclone, and cyclone for carrying out said method
DE3300859C2 (en) Device for deflecting and distributing a gas flow
DE69212308T2 (en) DEVICE FOR SEPARATING MULTIPLE COMPONENT CONTAINING FLUIDS
DE1671413B1 (en) VENTURI WASHERS FOR WET CLEANING OF GASES
DE2702019A1 (en) DUST COLLECTORS
EP0290956B1 (en) Dust separation device
DE2353111A1 (en) DEVICE FOR SEPARATING WATER FROM STEAM-WATER MIXTURES
DE1556654A1 (en) Process for the separation of defective particles in pneumatic conveying and device for carrying out the process
WO1981002724A1 (en) Method for adjusting the transport conditions in a pneumatic conveyor and pneumatic plant in a flour-mill for implementing such method
DE3320719C2 (en)
DE69007300T2 (en) Method and device for the erosion-corrosion protection of steam lines from the high-pressure part of a turbine.
DE2213276C3 (en) Wet separator for particles suspended in a gas stream
WO2022096670A1 (en) Suction device for extracting process gas from a process chamber of an apparatus, and apparatus for manufacturing three-dimensional objects
DE19651857C1 (en) Separator for removing coarse dust from incinerator plant flue gases
DE2534166A1 (en) METHOD AND DEVICE FOR CLEANING UP GASES CONTAINING DUST
DE68911711T2 (en) Collecting line for receiving gas flows from a plurality of units working in parallel.
DE2260729B1 (en) Separation element for a device for separating liquids or solids from a gaseous medium or solids from a liquid medium
AT3371U1 (en) DEVICE FOR CLEANING AND / OR DEDUSTING DUST-CONTAINING EXHAUST FLOWS

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE FR GB IT LI NL

17P Request for examination filed

Effective date: 19880920

17Q First examination report despatched

Effective date: 19890102

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI NL

REF Corresponds to:

Ref document number: 48246

Country of ref document: AT

Date of ref document: 19891215

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3480591

Country of ref document: DE

Date of ref document: 19900104

ET Fr: translation filed
ITF It: translation for a ep patent filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
26N No opposition filed
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19920813

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19920831

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19920918

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19930806

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19930831

BERE Be: lapsed

Owner name: ASEA STAL A.B.

Effective date: 19930831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19940301

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19970728

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19970811

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19970818

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19970821

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980806

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980831

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980831

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19980806

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990601

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST