JPH10274496A - Steel ball dust removal equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the pressure of a high-temperature gas for separating and removing dust from steel balls without requiring large transportation power for transporting the steel balls, enabling downsizing. Can
Provided is a steel ball dust removing device capable of improving efficiency. SOLUTION: An outer shell 23 is disposed on a gantry 22 so as to have a downward gradient from one end side to the other end side at a required inclination angle θ, and an inner shell 24 is substantially concentrically arranged inside the outer shell 23 with an axis. A driving device 26 such as a motor for rotatably driving the inner body 24 is installed on a support 27 and a plurality of straight fins 28 are required on the inner surface of the inner body 24 in the circumferential direction. Attach so as to extend in the axial direction at intervals, and insert a steel ball input pipe 29 at one end of the inner body 24 with the inner body 24.
A steel ball discharge pipe 30 is provided at the other end of the inner body 24, a hot gas supply pipe 31 is provided at the other end of the inner body 24, and a hot gas discharge pipe 32 is provided at one end of the inner body 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel ball dust for separating and removing dust from a steel ball from which ash and dust attached to a heat transfer surface of a gas gas heater are removed from a steel ball sprayer in a shot cleaning device. It relates to a removing device.

[0002]

2. Description of the Related Art As shown in FIG. 3, an exhaust gas duct 1 for feeding boiler exhaust gas GE discharged from a boiler.
Inside, a so-called gas gas heater 2 is provided.
In the gas gas heater 2, heat is recovered from the boiler exhaust gas GE by a heat medium flowing in the heat transfer tube group 3, and the heat recovered by the heat medium is radiated by another gas gas heater (not shown) provided in the exhaust gas duct 1. It is possible to do.

[0003] In the gas gas heater 2 described above, ash and dust adhere to the heat transfer tube group 3 during operation, and the heat recovery efficiency is reduced. A cleaning device is used.

[0004] Such a shot cleaning device is shown in FIG.
As shown in FIG. 1, a steel ball distributor 4 installed on the upper part of the casing 2a of the gas gas heater 2, a plurality of steel ball distribution pipes 5 connected to the lower surface of the steel ball distributor 4, and each steel ball distribution pipe 5 Is provided with a steel ball disperser 7 having a repulsion plate 6 below and having a diameter of about 5 [mm] distributed from the steel ball distributor 4 and distributed to each steel ball distribution pipe 5. The steel ball of the degree falls from the steel ball distribution pipe 5 to the repulsion plate 6 through the vertically arranged guide tube of the steel ball spreader 7 and is repelled by the repulsion plate 6 and spreads to some extent in plan view. The ash and dust attached to the heat transfer tubes are removed in the process of falling onto the heat transfer tube group 3 of the gas gas heater 2 in a state where the heat transfer tubes fall while colliding with the heat transfer tubes constituting the heat transfer tube group 3.

The steel ball that has fallen while colliding with the heat transfer tube is cut out by a steel ball discharger 8 connected to the lower portion of the casing 2 a of the gas gas heater 2 to a steel ball dust removal device 9. While the dust adhering in the above is removed, the dust is fed to a vertical transport device 10 such as a bucket elevator, transported upward by the vertical transport device 10, returned to the steel ball distributor 4 by the chute tube 11, and attached again to the heat transfer tube. It has been used to remove ash and dust.

[0006] As the steel ball dust removing device 9, for example, there is a device as disclosed in Japanese Patent Application Laid-Open No. Hei 7-190681, which includes a casing 9 a as shown in FIGS. 4 and 5. Inside the cylindrical rotary 1
2 is rotatably arranged via a rotary support bearing 16, a spiral blade 13 and a scraping plate 14 are provided inside the rotary 12, and a steel ball for guiding a steel ball into the rotary 12 is provided at one end of the casing 9 a. A ball inlet 19 is protruded, and a steel ball outlet 20 for discharging steel balls from inside the rotary 12 and a hot air inlet 21 for guiding a high-temperature gas such as heated air into the rotary 12 are provided on the other end side of the casing 9a. The rotary 1
2 is a rotating shaft 1 via a rotating device 17 by a motor 18
5 so as to be able to rotate by driving.

[0007] In the steel ball dust removing device 9 shown in FIGS. 4 and 5, the steel ball to which the dust cut out by the steel ball discharger 8 (see FIG. 3) adheres is rotated from the steel ball inlet 19 by the rotary 12. While being transported to the downstream side while being stirred by the spiral blade 13 in the rotary 12, it is scraped up by the scraping plate 14, falls and repeats collision and contact with each other, whereby The dust adhering to the steel ball is separated from the steel ball,
The steel ball discharged from the steel ball inlet 19 by the high-temperature gas supplied from the outside of the machine and from which the dust is separated and removed is fed from the steel ball outlet 20 to the vertical transport device 10 (see FIG. 3). Is done.

[0008]

However, in the conventional steel ball dust removing device 9 as described above, the steel ball is conveyed along the spiral blade 13 by rotating the rotary 12 disposed substantially horizontally. , A large transfer power is required, and the rotary 12
In addition, the inside of the rotary 12 is separated by a spiral blade 13, and a high-temperature gas for separating and removing dust from the steel ball is rotated in a direction opposite to the conveying direction of the steel ball. 12 circulates along the spiral blade 13, and the circulation distance is several times the total length of the rotary 12. Therefore, the pressure drop of the high-temperature gas also increases, and the power of the blower and the like increases by that much, and the efficiency is increased. It had the disadvantage of being bad.

In view of such circumstances, the present invention does not require a large transporting power for transporting steel balls, can reduce the size of the steel balls, and uses a high-temperature gas for separating and removing dust from the steel balls. An object of the present invention is to provide a steel ball dust removing device capable of suppressing a pressure drop and improving efficiency.

[0010]

According to the present invention, there is provided an outer body arranged so as to have a downward slope at a required inclination angle from one end to the other end, and substantially concentrically arranged inside the outer body. An inner body rotatably arranged about an axis, a driving device for driving the inner body to rotate, and attached to the inner surface of the inner body so as to extend in the axial direction at a required interval in the circumferential direction. A plurality of straight fins, a steel ball input pipe provided on one end side of the inner body, a steel ball discharge pipe provided on the other end side of the inner body, and a steel ball discharge pipe provided on the other end side of the inner body. A high-temperature gas supply pipe, and a high-temperature gas discharge pipe provided on one end side of the inner body.

According to the above means, the following effects can be obtained.

[0012] The steel ball with the dust attached is thrown from a steel ball feed pipe into an inner body which is rotationally driven by a driving device, and is scraped up by the straight fins in the inner body and falls and collides with each other. -The dust adhered to the steel ball is separated from the steel ball by the gravity and flows down to the downstream side while repeating the contact, and the hot gas supplied from the hot gas supply pipe is used to remove the dust from the hot gas discharge pipe. The steel ball discharged to the outside and from which the dust is separated and removed is discharged from a steel ball discharge pipe.

[0013] The inner body is arranged not horizontally but with a required inclination angle, the steel ball naturally flows down to the downstream side by gravity, and no power is required to transport the steel ball itself. Because you only need to rotate the inner trunk for separation,
The power is small and the size can be reduced.In addition, the inside of the inner body is provided only with straight fins extending in the axial direction, and high-temperature gas for separating and removing dust from steel balls is removed. The circulation distance is almost equal to the total length of the inner trunk,
Since the pressure is about a fraction of that in the conventional case, the pressure drop of the high-temperature gas is not so large, the power of the blower or the like is small, and the efficiency is improved.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an example of an embodiment of the present invention. In the drawings, the parts denoted by the same reference numerals as those in FIGS. The body 23 is disposed so as to have a downward slope at a required inclination angle θ from one end side to the other end side, and the inner body 2 is substantially concentrically arranged inside the outer body 23.
4 is disposed via a bearing 25 so as to be rotatable about an axis, and a driving device 26 such as a motor for rotatingly driving the inner body 24 is installed on a support base 27 projecting from the outer body 23. A plurality of straight fins 28 are attached to the inner surface of the inner body 24 at predetermined intervals in the circumferential direction so as to extend in the axial direction, respectively.
9, a steel ball discharge pipe 30 at the other end of the inner body 24, a hot gas supply pipe 31 at the other end of the inner body 24, and a hot gas discharge pipe 31 at one end of the inner body 24. 32
Are provided to configure the steel ball dust removing device 9.

The inclination angle θ of the outer shell 23 and the inner shell 24 is determined on the basis of a test actually performed in accordance with the carrying capacity of the steel ball.
The angle may be set to a required angle within the range of 5 °.

Next, the operation of the illustrated example will be described.

The steel ball to which the dust cut out by the steel ball discharger 8 (see FIG. 3) adheres is sent from a steel ball input pipe 29 to
It is thrown into the inner body 24 that is rotated and driven by the driving device 26, is scraped up by the straight fins 28 in the inner body 24, falls, and flows down to the downstream side by gravity while repeating collision and contact with each other. Then, the dust adhering to the steel ball is separated from the steel ball and discharged from the hot gas discharge pipe 32 to the outside by the high temperature gas supplied from the high temperature gas supply pipe 31, and the dust is separated. The removed steel balls are fed from the steel ball discharge pipe 30 to the vertical transport device 10 (see FIG. 3).

The inner body 24 is not horizontal but has a required inclination angle θ, and the steel ball naturally flows down to the downstream side by gravity, so that no power is required to transport the steel ball itself. Since the inner body 24 needs to be rotated only for separating the dust, the power is small and the size can be reduced.
Further, only the straight fins 28 extending in the axial direction are provided inside the inner body 24, and the flow distance of the hot gas for separating and removing the dust from the steel ball is equal to the total length of the inner body 24. Approximately equal, about several times smaller than before, the pressure drop of the high-temperature gas is not so large,
The power of the blower and the like can be reduced, and the efficiency is improved.

In this way, a large transport power is not required for transporting the steel balls, the size can be reduced, and the pressure drop of the hot gas for separating and removing the dust from the steel balls can be suppressed, and the efficiency can be improved. It can improve.

It should be noted that the steel ball dust removing apparatus of the present invention is not limited to the illustrated example described above, and it is needless to say that various changes can be made without departing from the gist of the present invention.

[0022]

As described above, according to the steel ball dust removing apparatus of the present invention, a large transport power is not required for transporting the steel balls, the size can be reduced, and the steel balls can be removed. An excellent effect that the pressure drop of the high-temperature gas for separating and removing the dust can be suppressed and the efficiency can be improved can be achieved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an example of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a schematic configuration diagram of an example of a shot cleaning device.

FIG. 4 is a side sectional view showing an example of a conventional steel ball dust removing device.

FIG. 5 is a view taken in the direction of arrows VV in FIG. 4;

[Explanation of symbols]

 9 Steel ball dust removal device 23 Outer body 24 Inner body 26 Drive device 28 Straight fin 29 Steel ball input pipe 30 Steel ball discharge pipe 31 Hot gas supply pipe 32 Hot gas discharge pipe θ Tilt angle

Claims (1)

[Claims] 1. An outer shell arranged so as to have a downward slope at a required inclination angle from one end side to the other end side, and disposed substantially concentrically inside the outer shell and rotatable about an axis. An inner trunk, a driving device that rotationally drives the inner trunk, and a plurality of straight fins attached to the inner surface of the inner trunk so as to extend in the axial direction at predetermined intervals in the circumferential direction, and A steel ball input pipe provided on one end side of the inner body,
A steel ball discharge pipe provided on the other end of the inner body, a hot gas supply pipe provided on the other end of the inner body, and a hot gas discharge pipe provided on one end of the inner body. A steel ball dust removing device comprising: