JP2005058872A - Capturing method for particle in hot gas and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To develop a cyclone free from deposition of particles and high temperature corrosion by omitting an inner cylinder. <P>SOLUTION: The subject capturing apparatus for a particle in a high temperature gas comprises a cylindrical body part 11; a ceiling part 13 connected to an upper edge of the body part 11 and having a center contracted toward an upward direction; a discharge cylinder 15 fixed to the center of the ceiling part 13; a feed pipe 14 fixed to the body part 11; and a reverse cone part 12 connected to a lower edge of the body part 11. The feed pipe 14 is fixed to a midway part of the body part 11 and at least a delivery port is downwardly inclined. The discharge cylinder 15 is constituted such that it does not have the downwardly projected part of the ceiling part 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an apparatus for collecting fine particles contained in exhaust gas of a combustion apparatus that generates a large amount of high-temperature combustion gas, such as a garbage incinerator.

  Circulating fluidized bed combustion furnaces that can apply a large amount of heat to efficiently burn fuel with relatively low combustion components such as municipal waste, sewage sludge, and industrial waste have come to be used. It was.

  This circulation-type combustion furnace is equipped with a vertical fluidized bed furnace and a cyclone, and connects the top of the fluidized furnace and the cyclone inlet (supply duct) to form an inverted conical outlet and a fluidized bed furnace. Connected to the lower part to form a circulation path of the fluidized bed, gas discharged from an inner cylinder (duct) installed so as to penetrate the ceiling of the cyclone is introduced into, for example, a steam superheater, and steam is generated. The heat energy is generated and recovered by power generation.

  In this way, particles such as dust and gravel as fuel are supplied as a fluid medium from the supply port opened at the lower part of the combustion furnace, and combustion air is supplied from the furnace bottom and the furnace wall side to the inside of the combustion furnace. Combusting while forming a fluidized bed, treating a part of the combustion gas and particles discharged from the top of the furnace with a cyclone, separating the combustion gas and particles and supplying the particles to the fluidized bed heat exchanger, In this heat exchanger, the heat energy is taken out by the particles and then returned to the combustion furnace again.

  This type of cyclone is proposed in, for example, Japanese Utility Model Laid-Open No. 4-122927 and Japanese Patent Publication No. 60-46324. In this cyclone, the ceiling part that closes the opening of the body part is a horizontal disk, the inner cylinder is inserted into the cyclone body from the center of the ceiling part, and further, this inner cylinder penetrates the ceiling part and exits The structure is connected to the duct.

However, combustion gas containing particles having a high temperature of 850 to 900 ° C. is discharged from the combustion furnace, which includes corrosive gas such as SO ₂ and HCL, and further, K, Na, etc. in the combustion ash. Contains alkali metals and heavy metals. These combustion ash has a low melting point and tends to be in a molten state, so it adheres to the inner cylinder (duct) of the cyclone and causes high-temperature corrosion, or the inner cylinder is gradually closed by the adhesion of particles, resulting in a large resistance. It may become.

  As a method for solving problems such as melt adhesion and corrosion of combustion ash, a structure in which the body and inner cylinder of the cyclone are forcibly cooled has been proposed (see, for example, Patent Document 1).

Moreover, what arrange | positions a spray pipe in an inner cylinder, sprays cooling water from this spray pipe, and reduces ash adhesion is proposed (for example, refer patent document 2).
Japanese Patent Laid-Open No. 10-128160 JP 2002-276916 A

  The invention described in Patent Document 1 is an apparatus in which a cyclone cylinder and an inner cylinder are formed with cooling pipes, and both the cyclone cylinder and the inner cylinder are cooled by cooling water. However, this jacket type cyclone has the disadvantage that the structure is complicated and the manufacturing cost is expensive, and depending on the contact state with the exhaust gas, wear occurs due to friction with high temperature particles rotating at high speed, There is a problem that the lifetime is shortened.

  Moreover, the cyclone described in patent document 2 has the problem that the temperature of exhaust gas falls by the spraying of the cooling water inside an inner cylinder, and the thermal efficiency of a boiler falls.

  By the way, the gas pressure loss of the cyclone generally used in the equipment is 50-300 mm water column, and the breakdown of the pressure loss is about 50% at the inlet and 50% at the outlet, which is about a half ratio. When this pressure loss increases, the power of the fan that sucks the combustion gas increases, and there is a disadvantage that the equipment cost and the operating cost increase.

  As described above, in a conventional cyclone for treating high-temperature exhaust gas used in an incinerator, exhaust gas is formed while forming a boundary between a swirling high-temperature gas flow and a gas flow from which powder is separated. An inner cylinder (duct) for guiding gas to the outside is an essential requirement. For this reason, a complicated jacket structure is required for cooling with cooling water, or a cooling structure such as spraying of cooling water is required. There was.

  Therefore, the present invention adopts a structure in which the inner cylinder is omitted without degrading the separation performance by essentially changing the structure of the cyclone that processes the high-temperature exhaust gas, and the cooling structure of the inner cylinder and under the high temperature It was obtained as a result of investigating whether or not the problem of particle adhesion could not be solved at once.

  If the inventor can omit the inner cylinder from the structure of the cyclone, the problem of adhesion of particles can be solved and the fan power can be reduced by reducing the pressure loss when the exhaust gas passes through the cyclone. As a result of paying attention to the point that can be achieved, the present invention has been achieved.

  Therefore, the first object of the present invention is to solve the problem of particle adhesion and blockage caused by the presence of the inner cylinder at the ceiling of the cyclone, specifically, the inner cylinder itself is omitted. To provide a cyclone structure.

  Furthermore, the second object of the present invention is to reduce the power for operating the exhaust fan by reducing the gas pressure loss of the cyclone.

  In order to achieve the above object, a method and apparatus for collecting hot particles in a fluidized bed boiler according to the present invention, that is, a cyclone, is configured as follows.

  1) A ceiling part is formed above the cylindrical body part, and a reduction part is formed below, and particles are supplied downward along the wall surface of the body part from a supply pipe provided laterally in the middle part of the body part. In the method of supplying a high-speed gas flow containing and separating particles by swirling of the gas flow, the gas flow supplied obliquely downward from a supply pipe provided in the middle portion of the trunk portion is moved along the wall surface. The swirling downflow and the upflow rising up the central part of the downflow are not mixed with each other, and the middle section of the trunk is raised while swirling via the intersecting space. Forming an upward flow swirl space for guiding the upward flow, and passing the step of separating particles by the swirl energy of the gas flow itself and the step of moving the gas from which the particles have been separated to the ceiling side It is characterized by that.

  2) a cylindrical body part 11, a ceiling part 13 whose center connected to the upper edge of the body part 11 shrinks upward, a discharge cylinder 15 fixed to the center of the ceiling part 13, A supply pipe 14 fixed to the body part 11 and an inverted conical part 12 connected to the lower edge of the body part 11, the supply pipe 14 being fixed to an intermediate part of the body part 11, and At least the discharge port is inclined downward, and the discharge cylinder 15 is configured not to have a portion protruding below the ceiling portion 13.

  3) The ceiling portion 13 is characterized by a conical shape bulging upward.

  4) The angle β formed with the horizontal surface of the ceiling portion 13 is 50 to 70 degrees, the downwardly inclined supply pipe 14 is formed in a rectangular cross section, and the angle α formed between the upper and lower surfaces and the horizontal surface is 10 to 20 degrees. It is characterized by being.

  5) The angle β formed with the horizontal surface of the ceiling portion 13 is 50 to 70 degrees, the downwardly inclined supply pipe 14 is formed in a rectangular cross section, the upper surface thereof is horizontal, the floor surface is directed downward, and the angle α formed with the horizontal surface. Is characterized by 10 to 20 degrees.

  6) The high-temperature gas is a high-temperature gas discharged from a combustion furnace of a fluidized bed boiler.

  The present invention pays attention to the direction of gas flow in order to omit the inner cylinder provided in the ceiling part of the cyclone, and the “intersection space” is provided below the trunk part in the cyclone body, and the “upward flow” is provided above the trunk part. By forming a “swirl space”, the swirl flow in which the gas descends while swirling above the trunk portion and the ascending flow that rises while swirling the central portion of the main body are prevented from being positively mixed. Therefore, the ceiling part and the discharge port of the supply pipe are considerably separated from each other, and only the gas flow rising while turning or a state in which this gas flow is large is formed between the discharge port and the ceiling part. It is a thing.

  The particle separation method of the present invention is extremely novel, and can provide separation performance with a cyclone having a remarkably simple structure.

  In the fluidized bed boiler according to the present invention, the high-temperature particle collecting device, that is, the cyclone, is designed to prevent the adhesion of particles in the high-temperature exhaust gas by omitting the inner cylinder (duct) itself provided at the center of the upper portion of the body. The problem is to provide a structure that can essentially eliminate the resistance to gas flow due to the presence of the inner cylinder.

  As is well known, in the conventional cyclone with an inner cylinder, there is know-how of each company about the length of the inner cylinder, and the length inserted into the trunk part from the ceiling part is long and short, thereby separating performance Has changed significantly. However, no structure has been proposed in which the inner cylinder itself is omitted.

Therefore, the result of examination in the experimental stage to reach the special structure of the cyclone according to the present invention will be described with reference to the drawings.
(Experiment 1: Inner cylinder length)
As shown in FIG. 4, the small cyclone 1 used in the experiment has a diameter d1 of the cylindrical portion of the barrel portion 2 of 72 mm, a length h1 of 150 mm, and the length of the inverted conical portion 3 extending below the barrel portion 2. The length h2 is 200 mm. Further, the exhaust gas supply pipe 4 has a rectangular cross section as shown in FIG. 5 and has a height of 36 mm and a width of 17 mm.

  The inner cylinder 5 provided in the vertical direction through the ceiling 2a of the body 2 was prepared with a diameter d2 of 32 mm and a lower end protruding 18 mm from the lower surface of the supply pipe 4.

  Although a plan view is not shown, the outer side surface of the supply pipe 4 and the surface of the body portion 2 are aligned linearly, and the supplied gas G is smoothly along the inner wall surface of the body portion 2. Swiveling at a high speed, descending while swirling to the position of the inverted conical portion 3, reversing at the lower portion of the inverse conical portion 3 and rising while swirling the central portion of the swirling flow descending near the wall surface, 5 is discharged as a processing gas g from which particles have been separated from the lower end opening.

  A pipe is connected between the supply section 4 of the cyclone 1 and a blower outlet (not shown), a mixer is disposed in the middle of the pipe, and compressed air is supplied to the pipe from the blower. Then, fly ash having a median diameter of 2.5 μm is used as a sample particle, and stirring is performed while supplying a sample powder to the mixer at a predetermined ratio to obtain an air flow having a predetermined concentration. 4 was adopted.

  FIG. 6 shows the sample powder collection efficiency on the vertical axis and the particle size of the sample powder on the horizontal axis when the velocity of the air flow supplied to the supply pipe 4 is 20 m / s. is there. Curve A shows the separation performance of the conventional cyclone, and curve B shows the separation performance of the basic structure of the present invention shown in FIG. As can be seen from this figure, it can be seen that those having a particle size of 1 to 3 μm in the supply part rapidly increased in separation performance (collection efficiency) and 100% was collected. Further, the difference in performance between the curves A and B is small, and it can be seen that the performance of the curve B is sufficiently efficient for practical use. In the cyclone 1 shown in FIG. 4 having the above various conditions, the lower end 5a of the inner cylinder 5 was cut by 10 mm, and the change in separation performance was confirmed. It was confirmed that the separation performance gradually deteriorated with the length to be cut. And when the said lower end 5a corresponded with the lower surface of the supply pipe | tube 4, it turned out that a separation performance fluctuates greatly, and when it becomes below half the height of this supply pipe | tube 4, a separation performance will deteriorate extremely.

FIG. 7 is an explanatory diagram of the swirling state of the gas G in a state in which the portion of the inner cylinder 5 protruding downward from the ceiling portion 2a is completely removed. As shown in this figure, the first gas G1 occupying a large part of the gas G containing the sample particles supplied is discharged from the discharge cylinder 5b corresponding to the upper part of the inner cylinder 5 with almost no separation of particles. Is done. Then, the remaining second gas G2 is reduced in air volume and swirling force, is lowered while swirling weakly along the inner wall surface of the trunk portion 2, and reversely rises in the vicinity of the inverted conical portion 3, and the discharge cylinder It is discharged from 5b. That is, if the portion of the inner cylinder 5 that protrudes downward from the top plate 2a is completely excised, the function as a cyclone is greatly lost.
(Experiment 2: Position and angle of supply unit 4)
As can be seen from FIG. 7, when the discharge port of the supply pipe 4 having a rectangular cross section and the opening at the lower end of the discharge cylinder 5b which is the remaining part of the inner cylinder 5 are close to each other, the gas G supplied from the supply section 4 is It turned out that it is discharged from the discharge pipe 5b as a shortcut that almost turns in the body part 2.

  Therefore, the present inventors examined a method of providing a distance k from the upper surface of the supply pipe 4 and the fixing plate in the body portion 2 to the ceiling portion 2a as shown in FIG.

  When the distance k between the ceiling part 2a and the upper surface of the supply pipe 4 is gradually changed from the upper end of the body part 2 to the intermediate position, the first gas G1 shown in FIG. 7 gradually decreases. It was found that the gas G2 increased. However, since the flow of the first gas G1 is considerably large in this state, the powder separation characteristic (collection efficiency) due to the swirling of the gas flow unique to the cyclone cannot be exhibited.

  Therefore, in addition to the change in the distance k of the intermediate portion of the body portion 2, the relationship of the angle α of the supply portion 4 having a rectangular cross section was examined.

When the supply unit 4 was adjusted downward from the horizontal direction, the amount of the first gas G1 gradually decreased, while the amount of the second gas G2 tended to increase clearly. However, it was recognized that there was a range for this angle α.
(Experimental result)
From the experimental results, the following was found.

  1) When the portion of the inner cylinder 5 projecting into the trunk portion 2 from the ceiling portion 2a is cut off, most of the gas supplied from the supply pipe 4 is short-passed as shown in FIG. 7 and above the ceiling portion 2a. It is discharged from the discharge tube 5b and the separation function as a cyclone is greatly lost.

  2) By providing the distance k between the ceiling portion 2a and the gas supply pipe 4 as shown in FIG. 8, the amount of gas discharged from the discharge cylinder 5b through a short pass is reduced.

  3) When the supply unit 4 is tilted downward to give the downward angle α, the swirl flow of the gas supplied into the cyclone 1 is increased, the separation performance is improved, and the gas discharged from the discharge cylinder 5b through a short path The amount of is reduced. However, it has been found that there is a certain range for the descending angle α.

4) It is important that a swirl flow is formed in the vicinity of the ceiling portion 2a and in the discharge tube 5b. Even if the inner tube 5 protruding into the body portion 2 by the action of the swirl flow is omitted, as a cyclone There is a possibility of obtaining an apparatus having a powder separation function.
(Example of the present invention)
As a result of analyzing the findings from the experiment, a new cyclone 10 shown in FIGS. 1 and 2 was completed.

  The cyclone 10 includes a cylindrical body portion 11, an inverted conical portion 12 connected to the lower end of the body portion 11, a conical ceiling portion 13 connected to the upper end of the body portion 11, and the body portion 11. And a supply pipe 14 having a rectangular cross section connected in a state of being inclined downward. By adopting such a structure, the inner cylinder, which was essential in the conventional cyclone, could be omitted.

  The characteristics of the cyclone 10 according to the present invention will be described as follows.

1) Mounting posture of the supply pipe 14 The supply pipe 14 (inlet duct) has a rectangular cross section, and an angle α in which both the upper surface and the floor surface are inclined downward with respect to the horizontal plane is in the range of 10 to 20 degrees. The gas was introduced into the body portion 11 while being inclined. In addition, it is preferable that the length of this inclined supply part 14 is 3 times or more of the long side of the supply pipe 14 of a rectangular cross section.

  The upper surface and the bottom surface of the supply pipe 14 do not necessarily have to be parallel to each other, and may be one in which only the bottom surface side is inclined in the range of the angle α in a trumpet shape in a side view. Further, it is possible to adopt a structure in which only the vicinity of the portion opening in the body portion 11 is inclined downward.

  When the downward angle α is 10 degrees or less, the supplied gas turns in the horizontal direction, so that it is difficult to form a strong swirling flow by generating a state that easily crosses the upward flow. On the other hand, when the angle is larger than 20 degrees, the gas is directed toward the inverted conical portion 12, and it becomes difficult to form a sufficient swirling flow in the body portion 11 and exhibit an excellent separation effect.

  FIG. 3 shows an operation diagram of the particle collecting apparatus according to the present invention, that is, the cyclone. The gas G supplied from the supply pipe 14 is supplied below the intermediate part of the body part 11 of the cyclone. The swirl flow descends along the wall surface, reverses at the inverted conical portion 12, and rises while swirling the central portion of the swirl flow. Accordingly, the upper half of the trunk portion 11 and the vicinity of the ceiling portion 13 are not substantially affected by the swirling flow of the supply gas G. Specifically, in this embodiment, the lower half of the body portion 11 is defined as an “intersection space” to form a space in which the flow swirling the wall surface and the rising flow are not mixed. Further, an “upward flow swirl space” is formed between the upper half of the trunk portion 11 and the ceiling portion 13, and a space through which a flow rising while exclusively swirling is formed separately.

2) Mounting position of the supply unit 14 The contact point between the upper surface of the supply pipe 14 formed of a rectangular cross-section pipe (duct) and the body part 11 is provided with a distance k below the contact point between the body part 11 and the ceiling part 13. . Therefore, a structure (the supply pipe 14 is fixed to the middle part of the body part) in which the body part 11 is extended vertically from the upper surface of the supply pipe 14 is employed.

  The distance k between the body portion 11 above the supply pipe 14 is preferably selected to be the length of the short side (upper surface) of the supply pipe 14 having a rectangular cross section or a range larger than ½ of the long side. A gas containing particles such as dust is supplied downward along the inner wall surface of the body portion 11 from the supply pipe 14 which is inclined and fixed at the downward angle α. As a result, it is possible not only to prevent the particles from short-passing to the discharge tube 15 provided in the center of the ceiling portion 12, but also to prevent the particles from extending to the lower portion of the trunk portion 11, that is, the cone. It is possible to increase the separation and collection efficiency of the particles by introducing from the section toward the particle discharge section 16.

  Incidentally, the descending angle α of the supply pipe 14 is related to the distance k, and the gas supplied from the supply pipe 14 fixed at the downward angle α as described above contacts or approaches the inner wall surface of the trunk portion 11. And must be configured to turn at high speed. In other words, when the distance k in FIG. 1 is increased, the time for the gas supplied from the supply pipe 14 to turn in the body 11 is shortened, and the ability to separate the powder is reduced.

3) Shape of the ceiling portion 13 The upper end of the trunk portion 11 is connected to the conical ceiling portion 13, and the shape of the ceiling portion 13 is a conical shape with an upward angle β of 50 to 70 degrees from this contact point. The cross section is reduced in shape. It is not necessary for the ceiling portion 13 to have a complete conical shape, and the ceiling portion 13 may be formed in a spherical or concave curved surface so as to smoothly guide the swirling flow rising to the discharge tube 15 side.

  If the angle β of the skirt portion of the ceiling portion 13 is smaller than 50 degrees, the gas toward the discharge cylinder 15 tends to stay, and resistance is given to the discharge of the rising gas while the staying gas turns. On the other hand, when the angle is larger than 70 degrees, the height of the ceiling portion 13 becomes longer than necessary, and the cyclone becomes larger, which causes problems in manufacturing cost and installation. By forming the conical ceiling portion 13 continuously above the body portion 11 as described above, an inertial force is applied to the particles in the cyclone body portion 11 to reach the side wall, and the gas and particles are separated. It becomes possible to strengthen the swirling flow as a driving force and develop this swirling flow in the ceiling portion 13 without being attenuated.

  Further, by forming the ceiling portion 13 in a conical shape, the swirling flow velocity increases from the large diameter portion to the small diameter portion. Therefore, it is possible to improve the overall particle collection efficiency (separation efficiency) by greatly increasing the particle collection capacity at this site compared to the horizontal flat ceiling of a conventional cyclone. It becomes.

4) Connection of the ceiling part 13 and the discharge cylinder 15 The ceiling part 13 is formed in a conical shape and is reduced upward, and its upper end and the lower end of the discharge cylinder 15 are connected. Therefore, the gas that rises while turning from the body 11 passes through the discharge cylinder 15 as it is and is introduced into other equipment. Therefore, the cyclone according to the present invention does not require any member having a function of separating and guiding the gas flow corresponding to the inner cylinder in the conventional cyclone.

5) Inverted cone 12
The inverted conical portion 12 (cone portion) formed subsequent to the lower side of the body portion 11 may not be particularly different from the conventional cyclone. The height of the inverted conical portion 12 may be about twice the diameter of the body portion 11. Further, the angle γ of the inverted conical portion 12 with respect to the horizontal plane at the lower end portion of the inverted conical portion 12 is about 75 to 85 degrees, and this angle γ is common sense so that the separated powder can be discharged smoothly. It may be selected within the range of various designs.

  Table 1 shows the separation performance or collection efficiency of the particles tested in the pilot plant using the cyclone having the structure shown in FIGS. 1 and 2 and the conventional cyclone shown in FIGS. 4 and 5. Results were obtained.

As shown in FIG. 6, the separation performance tends to be slightly inferior to that of the conventional cyclone. However, in the actual apparatus, there is no ash adhesion, the pressure loss is halved, and the equipment cost is considerably reduced. There are various effects such as being possible.

  In the method for collecting particles in a high-temperature gas according to the present invention, a ceiling part is formed above a cylindrical body part, and a reduction part is formed below, and a supply pipe provided laterally at an intermediate part of the body part Further, in a method of supplying a high-speed gas flow containing particles downward along the wall surface of the body portion and separating the particles by swirling of the gas flow, obliquely below the supply pipe provided in the middle portion of the body portion The gas flow supplied to the crossing space where the downward flow swirling along the wall surface and the upward flow rising up the central portion of the downward flow are not positively mixed, and above the middle portion of the trunk portion An upward flow swirl space that guides the upward flow rising while swirling via the intersecting space, separating the particles by the swirling energy of the gas flow itself, and the gas from which the particles are separated Through the process of moving to the ceiling side It is characterized in that the.

  In addition, the apparatus used for this includes a cylindrical body part, a ceiling part whose center connected to the upper edge of the body part shrinks upward, and a discharge tube fixed to the center of the ceiling part. A supply pipe fixed to the body part and an inverted conical part connected to a lower edge of the body part, the supply pipe being fixed to an intermediate part of the body part, and at least a discharge port It is inclined downward, and the discharge tube is configured not to have a portion protruding downward from the ceiling portion.

  A) Therefore, the inner cylinder of the metal part required in the conventional cyclone does not exist, and the metal part that supports this is also unnecessary.

  B) Since the ceiling part which closes the opening part of the upper edge of a trunk | drum is formed in the shape which shrinks upwards, the gas flow which rises while turning will flow out smoothly. This is because an inner cylinder is essential for a conventional cyclone, and a portion where the gas flow path suddenly shrinks or expands inevitably occurs. However, in the present invention, such a flow path is completely formed. The pressure loss is about half that of a conventional cyclone.

  C) Further, the particle collecting apparatus according to the present invention has a simple structure in which the expansion and contraction of the gas flow path is small, so that troubles such as adhesion of a low melting point substance or blockage of the flow path occur. There is nothing at all.

  D) Since there is no high temperature metal part constituting the inner cylinder of the conventional cyclone, there is no problem of high temperature corrosion due to corrosive gas, low melting point alkali, heavy metal, etc. generated during combustion of waste.

  E) There is no problem of wear or thermal distortion that the conventional cyclone inner cylinder has.

  F) Therefore, the effect of separating and collecting particles can be sufficiently exhibited like a cyclone having a conventional inner cylinder.

It is a longitudinal cross-sectional view of the cyclone which concerns on embodiment of this invention. FIG. 2 is a plan sectional view of FIG. 1. It is action | operation explanatory drawing of the cyclone of this invention. It is a longitudinal cross-sectional view of a cyclone having a conventional inner cylinder. It is sectional drawing of the supply pipe | tube with a rectangular cross section. It is a graph which shows the separation performance of a cyclone. It is the longitudinal cross-sectional view which cut | disconnected the inner cylinder of the conventional cyclone. It is a longitudinal cross-sectional view of the cyclone used for the experiment for confirming the effect | action of the cyclone of this invention.

Explanation of symbols

10 Cyclone (particle collection device) 11 Body 12 Reverse cone
13 Ceiling part 14 Supply pipe (supply duct) 15 Discharge tube (discharge duct) 16 Particle discharge part

Claims (6)

A high-speed part containing particles below the barrel wall from a supply pipe that is formed horizontally on the middle of the barrel, with a ceiling above the cylindrical barrel and a reduced portion below the barrel. In the method of separating the particles by swirling the gas flow, swirling the gas flow supplied obliquely downward from the supply pipe provided in the intermediate portion of the trunk portion along the wall surface. An updraft that rises while swirling via the crossing space above the middle part of the trunk part An upward flow swirl space that guides the gas, and the process of separating the particles by the swirl energy of the gas flow itself and the step of moving the gas from which the particles have been separated to the ceiling portion side Of particles in hot gases characterized by Method. A cylindrical body, a ceiling connected to the upper edge of the body, a ceiling that shrinks upward, a discharge tube fixed to the center of the ceiling, and a supply fixed to the body A pipe and an inverted conical part connected to the lower edge of the body part, the supply pipe being fixed to an intermediate part of the body part, and at least a discharge port being inclined downward, the discharge An apparatus for collecting particles in high-temperature gas, wherein the cylinder is configured not to have a portion protruding below the ceiling portion. The apparatus for collecting particles in high-temperature gas according to claim 2, wherein the ceiling portion has a conical shape bulging upward. The angle β formed by the horizontal surface of the ceiling portion is 50 to 70 degrees, the downwardly inclined supply pipe is formed in a rectangular cross section, and the angle α formed by the upper and lower surfaces and the horizontal surface is 10 to 20 degrees. An apparatus for collecting particles in a high-temperature gas according to claim 2 The angle β formed with the horizontal surface of the ceiling part is 50 to 70 degrees, the downwardly inclined supply pipe is formed in a rectangular cross section, the upper surface is horizontal, the floor surface is downward, and the angle α formed with the horizontal surface is 10 to 20 The apparatus for collecting particles in a high-temperature gas according to claim 2, The said high temperature gas is a high temperature gas discharged | emitted from the combustion furnace of a fluidized-bed boiler, The collection device of the particle | grains in the high temperature gas of Claim 1 characterized by the above-mentioned.