JP3316372B2 - Powder material dispersion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for dispersing a powder raw material provided in a portion where a powder raw material is introduced into a gas flow, such as a suspension preheater for cement production.

[0002]

2. Description of the Related Art Conventionally, in a suspension preheater for producing cement as shown in FIG. 8, a powder raw material dispersing apparatus is used in a portion indicated by A where a powdery cement raw material is charged. In the suspension preheater, a cement raw material for firing in the rotary kiln 1 is preheated using exhaust gas from the rotary kiln 1 and a cooler 2 for cooling the fired cement raw material.

[0003] Combustion gas 4 from the rotary kiln 1 and the cooler 2 flows into the duct 3 extending in the vertical direction as an upward flow. A powdery raw material is introduced from the introduction chute 5, dispersed in the combustion gas 4 and introduced into the cyclone 6 together with the gas. The powder raw material separated by the cyclone 6 is fed into the rotary kiln 1 from below the cyclone 6. In the combustion gas separated from the powder raw material in the cyclone 6, the raw material powder input from the input chute 7 is dispersed. The combustion gas in which the new raw material powder is dispersed is guided to the cyclone 8 through the duct 9. The combustion gas separated from the raw material powder in the cyclone 8 is sucked by the suction fan 10. The raw material powder separated from the combustion gas in the cyclone 8 is supplied into the duct 3 through the charging chute 5 as described above. Therefore, when a new powder raw material is charged from the charging chute 7, it is heated by exchanging heat with the combustion gas while being transported from the duct 9 to the cyclone 8, and is separated by the cyclone 8. , And further heated, separated by the cyclone 6 and put into the rotary kiln 1.

In the dispersing apparatus A shown in FIG. 8, it is preferable that the input raw material powder is efficiently dispersed in the combustion gas 4 to enable sufficient heat exchange. The prior art regarding the dispersing device is disclosed in, for example, Japanese Patent Application Laid-Open No. 50-72924,
154926, Japanese Utility Model 59-55549, Japanese Utility Model 61
-30156, Shoko 62-4879, Shoko 62-2
9919, Shokai 62-156799, Shokai 62-1
56800 and JP-A-6-191615. Of these prior arts, Japanese Patent Laid-Open No. 50-72
No. 924 discloses a configuration in which a furnace for charging a raw material into a rotary kiln is provided, and air is blown from a fan into the furnace. Japanese Utility Model Application Laid-Open No. 56-154926 discloses a configuration in which gas is blown through a perforated plate. 59-3
No. 5549 discloses a configuration in which a dispersion device in which dispersion rods are radially arranged in a duct is provided. 61
No. -30156 discloses a configuration in which a dispersing plate having a horizontal portion and an inclined surface portion that goes upward as it goes forward is provided so as to protrude into the duct.

Japanese Utility Model Publication No. 62-4879 discloses a dispersion box having a bottom surface for reflecting and diffusing a powdery raw material fed into a connection portion between a duct and a charging chute in a horizontal direction, and changing a tilt angle in the dispersion box. A configuration for providing a plate that can be used is disclosed. Japanese Utility Model Publication No. Sho 62-29919 discloses a configuration in which the input chute is input while gradually changing the angle of the input chute so as to be orthogonal to the direction of the airflow in the duct. 62-156799 and 62-156800
Discloses a configuration in which a high-temperature combustion gas is bypassed and guided to a portion where a raw material is introduced into a duct. Japanese Patent Application Laid-Open No. 6-191615 discloses a structure in which a protruding portion that protrudes in a mountain shape of a probability curve is formed below a portion where a charging chute is connected to a duct, and the direction is changed so that the powder material to be charged spreads in the duct. Is disclosed.

[0006]

In the suspension preheater shown in FIG. 8, the combustion gas 4 is sucked by the suction force of the suction fan 10. If the flow rate of the combustion gas 4 is large, it is possible to sufficiently disperse the raw material powder in the combustion gas 4 at the dispersing device A, but the ducts 3 and 9
And the time required for heat exchange between the raw material powder and the combustion gas cannot be sufficiently obtained. Also, when the flow velocity of the combustion gas 4 increases, the pressure loss in the ducts 3 and 9 and the cyclones 6 and 8 increases, the power required for the suction fan 10 increases, and the power energy consumption increases. For this reason,
It is preferable that the raw material powder can be conveyed even at a lower flow rate, and the prior arts described above have been proposed.

In the prior art of Japanese Patent Application Laid-Open No. 50-72924,
Since a fan is required for dispersion and a furnace is required for dispersion, it is difficult to apply this method to a dispersion device that uses a suspension preheater to supply powdered raw material from the middle of a duct connecting between multiple stages of cyclones. is there. 56
In the prior art of -154926, a gas supply source is required, and the configuration becomes complicated. 59-554
In the nine prior arts, it is necessary to provide a driving device for constantly driving a rotating shaft provided with a plurality of dispersion rods. 6
In the prior art of 1-301156, since the dispersion plate protrudes greatly into the duct, the gas flow is disturbed and the pressure loss increases. Further, once the dispersion plate is installed, its length cannot be adjusted from outside. In the prior art of Japanese Utility Model Publication No. 62-4879, if a movable plate is provided, the dispersion performance can be adjusted, but the adjustment range is narrow. In the prior art of Japanese Utility Model Publication No. 62-29919, it is difficult to adjust it once installed. 62-156799 and 6
In the prior art of 2-156800, high-temperature combustion gas is bypassed, so that heat loss increases. In the prior art of Japanese Patent Application Laid-Open No. 6-191615, the structure of the connection between the drop chute and the duct is complicated and adjustment is impossible.

An object of the present invention is to provide an apparatus for dispersing a powdery raw material which can be easily adjusted so as to exhibit an optimum dispersing effect according to the amount of the raw material and the amount of the gas and which does not disturb the gas flow. To provide.

[0009]

According to the present invention, there is provided a dispersing apparatus provided at a connection portion between a charging chute into which a powder raw material is charged and a duct through which an upward flow of gas flows, for floating the powder raw material in a gas flow. And a dispersing means capable of projecting up to a half of the inner diameter of the input chute by an angular displacement about the horizontal axis, and suppressing a protruding length into the duct to a predetermined length or less. Has a plane portion parallel to the horizontal axis and a cylindrical surface portion having a constant radius and continuing to the base end side of the plane portion.
An apparatus for dispersing a powder raw material, wherein a storage chamber for storing a cylindrical surface portion of a dispersion means is provided. According to the present invention, the dispersing means can project up to 1/2 of the inner diameter into the input chute at the maximum by the angular displacement about the horizontal axis. A great dispersing effect can be exhibited. During the angular displacement of the dispersing means, the projecting length into the duct is equal to or less than a predetermined length, so design the length so as not to impede the gas flow in the duct. With this arrangement, the gas flow in the duct is not disturbed during the angular displacement, and the pressure loss in the duct is reduced, so that the energy required for forming the gas flow in the duct can be saved.

Further, the length of the flat portion of the dispersing means projecting into the charging chute can be adjusted by angular displacement about the horizontal axis. The cylindrical surface portion is connected to the base end of the flat portion, so that the cylindrical surface portion of the dispersing means can cover the angular displacement axis, preventing powder raw materials and the like from entering the storage chamber and accumulating during angular displacement. be able to.

In the present invention, the distal end of the flat portion of the dispersing means is formed such that the projecting length into the charging chute is larger at the center in the horizontal axis direction than at both ends. It is characterized by being. According to the present invention, since the central portion in the horizontal axis direction on the front end side of the flat portion of the dispersing means is formed so that the projecting length into the charging chute is larger than both end portions, the powder colliding with the dispersing means is formed. The direction in which the material is reflected can be widened at both ends, and can be dispersed well in the duct.

Further, in the present invention, the storage chamber is provided with an interval of a predetermined distance or more between the inner surface of the side wall and the side surface of the dispersing means at both ends in the horizontal axis direction. . According to the present invention, both ends in the horizontal axis direction of the dispersing means are provided with a distance equal to or longer than a predetermined distance between the dispersing means and the inner surface of the side wall of the storage chamber. This makes it possible to avoid a situation in which angular displacement becomes difficult. Further, in the present invention, the dispersing means is characterized in that a cylindrical dispersing drum is accommodated in a casing, and the dispersing drum can be angularly displaced around a rotation axis which is parallel to the axis and shifted from the axis. . According to the present invention, since the cylindrical dispersion drum is parallel to the axis and can be angularly displaced around the rotation axis deviated from the axis, the dispersion effect can be adjusted by changing the protrusion amount of the dispersion drum. Can be. In the present invention,
The dispersion drum is provided with a plurality of stopper insertion holes, and the amount of protrusion of the dispersion drum into the charging chute can be set by passing the stopper together with the stopper insertion hole on the casing side. According to the present invention, the projecting amount of the dispersion drum into the charging chute can be set stepwise.

[0013]

FIG. 1 shows a schematic configuration of a dispersion apparatus 20 according to an embodiment of the present invention. Casing 2
Dispersion plate 22 as dispersion means capable of swinging displacement as angular displacement about the horizontal axis is accommodated in 1. Dispersion device 2
Numeral 0 is arranged at a portion where a charging chute 25 for dropping and charging a powdery raw material from above from the upper side into a rising gas 24 flowing through a duct 23 is connected. Dispersion plate 22
Swings around the swinging shaft 26, as shown by the solid line, a state perpendicular to the axis 25a of the throwing chute 25 and protruding to 1/2 of the inner diameter D, and two points 90 ° angularly displaced from this state. Oscillating displacement is possible between the state 22a indicated by the chain line. Immediately before the state 22a in which the 90 ° angular displacement has occurred, the leading end of the dispersion plate 22 enters the duct 23 most.
Assuming that the rush length at this time is L1, this rush length L1
Is set so as not to disturb the flow of the rising gas 24 and not to increase the pressure loss, for example, to be 10% or less of the inner diameter of the duct 23. Projection amount L into injection chute 25
As described above, since 1 / 2D is the maximum value, L ≦ 1
/ 2D. In addition, on extension of the input chute 25,
State 2 in which the tip end of the dispersion plate 22 projects more than 1/2 of the inner diameter D
There may be 2b, but substantially inside duct 23.

Further, in the present invention, the storage chamber is provided with an interval of a predetermined distance or more between the inner surface of the side wall and the side surface of the dispersing means at both ends in the horizontal axis direction. . According to the present invention, both ends in the horizontal axis direction of the dispersing means are provided with a distance equal to or longer than a predetermined distance between the dispersing means and the inner surface of the side wall of the storage chamber. This makes it possible to avoid a situation in which angular displacement becomes difficult. Furthermore, the present invention provides a dispersing device provided at a connection portion between a charging chute into which a powder raw material is charged and a duct through which an upward flow of gas flows, wherein the powder raw material is floated in a gas flow. And a dispersing means capable of projecting up to a half of the inner diameter of the input chute at a maximum, and a projecting length into the duct being suppressed to a predetermined length or less, wherein the dispersing means has a cylindrical shape in the casing. A dispersing drum is housed therein, and the dispersing drum is a powder raw material dispersing device characterized in that the dispersing drum can be angularly displaced around a rotation axis that is parallel to and displaced from the axis. According to the present invention, the dispersing means can project up to 1/2 of the inner diameter into the input chute at the maximum by the angular displacement about the horizontal axis. A great dispersing effect can be exhibited. During the angular displacement of the dispersing means, the projecting length into the duct is equal to or less than a predetermined length, so design the length so as not to impede the gas flow in the duct. With this arrangement, the gas flow in the duct is not disturbed during the angular displacement, and the pressure loss in the duct is reduced, so that the energy required for forming the gas flow in the duct can be saved. Since the cylindrical dispersion drum is parallel to the axis and can be angularly displaced around the rotation axis deviated from the axis, the dispersion effect can be adjusted by changing the amount of protrusion of the dispersion drum. In the present invention,
A plurality of stopper insertion holes are provided in the dispersion drum, and the amount of protrusion of the dispersion drum into the charging chute can be set by penetrating the stopper together with the stopper insertion hole on the casing side. According to the present invention, the projecting amount of the dispersion drum into the charging chute can be set stepwise.

FIG. 4 shows the dispersion plate 22 shown in FIG. 2 and FIG.
The structure of is shown. 4A is a front view, and FIG. 4B is a right side view. The dispersion plate 22 is a flat plate-like portion 2.
2a, a cylindrical surface portion 22b and a reinforcing portion 22c
Composed of The swing shaft 26 is fixed to the reinforcing portion 22c. The flat portion 22a is formed so as to be closer to the center in the axial direction of the swing shaft 26 and longer than both ends. Thereby, the powder raw material can be widely dispersed in the duct 23.

FIG. 5 shows a configuration of a dispersion apparatus 40 according to another embodiment of the present invention. A dispersion drum 42 is housed in the casing 41. The casing 41 includes the duct 4
A charging chute 45 for charging a powder material from obliquely upward to the rising gas 44 in 3 is formed at a portion connected thereto. The dispersion drum 42 has a cylindrical shape, and can be angularly displaced around a rotation axis 46 that is parallel to and deviated from the axis. Due to the rotation of the dispersion drum 42, the surface of the dispersion drum 42 is placed in the charging chute 45 at the maximum Hmax. Protruding only at the minimum Hmin. Just protrude. The intermediate projecting position is Hn
or. It is. The casing 41 is provided with stopper insertion holes 47 on both sides.

FIG. 6 shows the structure of the dispersion drum 42 shown in FIG. FIG. 6A is a front view, and FIG. 6B is a left side view in which the right side is a cross-sectional view. The dispersion drum 42 is provided with a plurality of stopper insertion holes 48, and the stoppers can be made to pass through together with the stopper insertion holes 47 on the casing 41 side shown in FIG. By selecting one of the stopper insertion holes 48, it is possible to set the amount of projection of the dispersion drum 42 into the charging chute 45.

Here, an experiment is performed to compare the performance of the dispersing device 40 with that of the conventional one. The evaluation of the experiment is performed based on the drop rate S expressed by the following first equation. The “fall amount” indicates the amount that has fallen directly into the duct 43 without being dispersed.

[0019]

(Equation 1)

In the experimental results shown in FIG. 7, a comparison was made between a plain type and a conventional type which does not use the dispersion drum 42, and a dispersion apparatus 40 using the dispersion drum 42 as a new type.
And the amount of protrusion into the input chute 45 is Hmin. , Hn
or. , Hmax. The test was changed in three stages. In the new model, the drop rate is significantly lower than in the plain type. In addition, from FIG. 7, it can be estimated that the direct drop rate is sufficiently small when the protrusion length of the cylindrical portion is about 1/2 of the inner diameter of the charging chute 45. On the other hand, if the amount of protrusion is larger than の of the inner diameter of the input chute 45, the diameter of the input chute 45 is substantially reduced, and there is a possibility that the input chute 45 may be clogged.

Although each of the embodiments has been described on the assumption that the dispersing devices 20 and 40 are applied to a suspension preheater, the present invention can also be applied to other applications that need to disperse powder in an airflow.

[0022]

As described above, according to the present invention, the dispersing means is angularly displaced about the horizontal axis, so that the amount of the powder material supplied from the charging chute and the flow rate of the gas flow in the duct can be adjusted. An optimal dispersion effect can be exhibited. The angular displacement of the dispersing means can be easily performed over a wide range while driving while observing the driving conditions. Even when the dispersing means is angularly displaced, the length of the dispersing means projecting into the duct does not exceed a preset length.Therefore, by setting the length within a range where the pressure loss does not increase, the gas flow can be reduced. Disturbance is reduced, and pressure loss can be reduced.

Further, since the dispersing means has a structure having a flat portion and a cylindrical surface portion continuous on the base end side of the flat portion, the structure is simple and the manufacturing cost can be reduced.

Further, according to the present invention, since the shape of the front end of the flat portion of the dispersing means is formed so that the central portion is convex, the powder material is widely reflected by the dispersing plate and the gas in the duct is formed. Can be dispersed well.

Further, according to the present invention, since both ends in the horizontal axis direction of the dispersing means are provided so as to be more than a predetermined distance apart from the inner surface of the side wall, the powder material is deposited and the dispersing means is swung. A situation in which the displacement becomes difficult can be avoided. Further, according to the present invention, by displacing the dispersing means angularly about the horizontal axis, it is possible to exhibit an optimal dispersing effect according to the amount of the powder raw material supplied from the charging chute and the flow rate of the gas flow in the duct. Can be.
The angular displacement of the dispersing means can be easily performed over a wide range while driving while observing the driving conditions. Even when the dispersing means is angularly displaced, the length of the dispersing means projecting into the duct does not exceed a preset length.Therefore, by setting the length within a range where the pressure loss does not increase, the gas flow can be reduced. Disturbance is reduced, and pressure loss can be reduced. Further, the dispersion effect can be adjusted by the angular displacement of the cylindrical dispersion drum. Further, according to the present invention, the dispersion drum can be made to protrude stepwise into the charging chute.

[Brief description of the drawings]

FIG. 1 is a simplified cross-sectional view showing a configuration of a main part of an embodiment of the present invention.

FIG. 2 is a front view of the dispersion apparatus 20 according to the embodiment of FIG.

FIG. 3 is a plan sectional view of the dispersion device 20 according to the embodiment of FIG.

FIG. 4 is a front view and a right side view of the dispersion plate 22 of the embodiment of FIG.

FIG. 5 is a cross-sectional view illustrating a configuration of a dispersion apparatus 40 according to another embodiment of the present invention.

6 is a plan view and a left side view of a dispersion drum used in the dispersion device 40 of FIG.

FIG. 7 is a graph showing an experimental result obtained by the experimental apparatus shown in FIG. 5;

FIG. 8 is a system diagram showing a configuration of a conventional suspension preheater of a cement production facility.

[Explanation of symbols]

 20, 40 Dispersing device 21, 41 Casing 22 Dispersing plate 23, 43 Duct 24, 44 Ascending gas 25, 45 Input chute 26 Swing axis 27 Lever 30 Lower casing 31 Inspection port 42 Dispersion drum 46 Rotating axis

Continuation of the front page (56) References JP-A-57-71626 (JP, A) JP-A-47-30721 (JP, A) JP-A-55-143495 (JP, U) JP-A-62-4879 (JP) , Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B01F 3/00-3/22 B01F 15/00-15/06

Claims (5)

(57) [Claims] 1. A dispersing device provided at a connection between a charging chute into which a powder raw material is charged and a duct through which an upward flow of gas flows, for floating the powder raw material in a gas flow, wherein an angular displacement about a horizontal axis is provided. And a dispersing means capable of projecting up to a half of the inner diameter of the input chute at a maximum, and a projecting length into the duct being suppressed to a predetermined length or less, wherein the dispersing means is parallel to the horizontal axis. A powder having a flat portion and a cylindrical surface portion having a constant radius continuous with the base end side of the flat portion, and a storage chamber for storing the cylindrical surface portion of the dispersing means is provided below the charging chute; Raw material dispersion equipment. 2. The front end of the flat portion of the dispersing means is formed such that the projecting length into the charging chute is larger at the center in the horizontal axis direction than at both ends. The apparatus for dispersing a powder raw material according to claim 1, wherein: 3. The storage chamber is provided with a distance equal to or greater than a predetermined distance between an inner surface of a side wall and a side surface of the dispersing means at both ends in the horizontal axis direction. An apparatus for dispersing a powder raw material as described above. 4. A dispersing device, which is provided at a connection portion between a charging chute into which a powder raw material is charged and a duct through which an upward flow of gas flows, and floats the powder raw material in a gas flow, comprises: an angular displacement around a horizontal axis. And a dispersing means capable of projecting up to a half of the inner diameter of the input chute at a maximum, and a projecting length into the duct being suppressed to a predetermined length or less, wherein the dispersing means has a cylindrical shape in the casing. An apparatus for dispersing a powder raw material, wherein a dispersion drum is accommodated, and the dispersion drum can be angularly displaced around a rotation axis which is parallel to and deviated from the axis. 5. The dispersion drum is provided with a plurality of stopper insertion holes, and the amount of protrusion of the dispersion drum into the charging chute can be set by penetrating the stopper together with the stopper insertion hole on the casing side. The apparatus for dispersing a powder raw material according to claim 4, characterized in that: