JP3278565B2 - Dust removal device for exhaust duct in high-temperature melting furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an exhaust gas in a melting furnace, a coal high-temperature gasification furnace (coal ash melting extraction furnace), or an electric furnace for steel making so as to reduce or detoxify waste or waste incineration ash. The present invention relates to a dust removing device for a duct.

[0002]

2. Description of the Related Art In a high-temperature melting furnace as described above, when a solid such as waste incineration ash is melted at a high temperature, a large amount of oxidized or decomposed gas is generated, and fine particles are generated with the generation of the gas. Dust is generated, and the dust is discharged together with the exhaust gas. Further, the dust is in a molten or semi-molten state and has a strong adhesive property, and a part of the dust is deposited on the inner wall surface of the exhaust duct. If this state is left undisturbed, the exhaust duct will be blocked, and it is necessary to remove dust.

[0003] Conventionally, there is a dust removing device as shown in FIG. 5 for removing dust accumulated on the inner wall surface of the exhaust duct. That is, the dust removing device 50
Removes dust 59 adhering to the inner wall surface of a horizontal portion 53 of the exhaust duct 52 attached to the melting furnace main body 51 (this horizontal portion communicates with the melting furnace main body 51 via a vertical portion). A tube 54 for discharging the dust removing air 55 is inserted along the axial direction of the horizontal portion 53, and a discharge hole 56 for the dust removing air 55 is formed at the tip of the tube 54. Halfway 5 on the way
3 is slidably supported by an end cover member 57, and a base end of the tube 54 is an intake pipe 6 for air 55 for dust removal.
0 is connected, and a moving device 58 for moving the tube 54 along the axis of the horizontal portion 53 is provided.

In this configuration, when the melting furnace is operating, the moving device 58 is driven to move the tube 54 backward. By the way, this dust removal device 50 is
Since a large amount of dust removal air 55 is discharged from 6 to remove the dust 59 attached to the inner wall, the flow rate balance in the melting furnace is lost during the operation of the melting furnace. Therefore, when removing the dust 59, the moving device 58 is driven to move the tube 54 forward while the operation of the melting furnace is periodically stopped, and the dust 59 is discharged from the discharge hole 56 to discharge the dust 59. Is to be removed.

[0005]

In the above-described conventional dust removing apparatus 50, a large amount of dust removing air 55 is discharged from the discharge holes 56, and therefore, it must be used while the operation of the melting furnace is stopped. In addition, the operating efficiency of the melting furnace is reduced.

Accordingly, an object of the present invention is to provide a dust removing device for an exhaust duct in a high-temperature melting furnace capable of solving the above-mentioned problems.

[0007]

Means for solving the problems according to the present invention is a dust removing device for an exhaust duct for exhausting exhaust gas generated in a melting furnace main body, wherein the exhaust duct has an axial center. A rod-shaped moving member is movably provided along the direction, and is rotatably provided around the axis of the exhaust duct. A dust removing blade member is attached in a radial direction of the moving member, and The moving member includes an outer cylinder having a closed distal end, and an inner cylinder having a distal end opened while being inserted from the proximal end of the outer cylinder so as to have a gap in the outer cylinder, A flow path for a cooling fluid for reducing the adhesion of dust is formed in the moving member, and a supply pipe for supplying cooling water is slidable from an insertion hole formed at a base end of the inner cylinder. Through the outer cylinder In the middle of the end side, in which opening member having an outlet of cooling water is rotatably mounted through the water-shutoff member.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a melting furnace main body of a high-temperature melting furnace for heating and melting, for example, incineration ash of waste, and an upper wall 1a of the melting furnace main body is provided with an exhaust gas treatment device (shown in FIG. Although not shown, an exhaust duct 2 having a circular cross section for leading to, for example, a dust collector is connected.

The portion connected to the upper wall 1a of the exhaust duct 2 is raised up to a predetermined height to form a vertical portion 2a, the upper portion of which is a horizontal portion 2b, and the tip of which is as described above. Connected to the exhaust gas treatment device.

The exhaust duct 2 has a double wall structure, and a cooling jacket is formed by supplying cooling water W into the double wall in order to reduce the adhesion of the dust D. In the figure, 3 is a cooling water supply pipe, and 4 is a cooling water discharge pipe.

A vertical rotating shaft 6 is rotatably inserted through an upper portion of the vertical portion 2 a of the exhaust duct 2, that is, a bent portion of the exhaust duct 2 through a bearing 5. A driving motor (rotary driving device) 7 is connected to the upper end, and an arm member 8 is attached to the lower end in a horizontal direction.

At both ends of the arm member 8, a chain 9 (a wire or the like may be used) for scraping off the dust D along the inner wall surface of the vertical portion 2a of the exhaust duct 2 to the lower end of the vertical portion 2a. Hanged.

By the way, a rod-shaped tube (an example of a moving member) 10 is inserted along the axis of the horizontal portion 2b from the side of the horizontal portion 2b of the exhaust duct, that is, a vertical portion of the bent portion of the exhaust duct 2. The tube 10 is movably supported along the horizontal portion 2b axis of the exhaust duct, and is rotatably supported around the horizontal portion 2b. The tube 10 is moved along the horizontal portion 2b. A moving / rotating device 11 is provided for rotating the shaft 2 about the axis of the horizontal portion 2b.

A wing member 13 for removing dust D is attached to the distal end of the tube 10 in the radial direction. A concave portion 12 for accommodating the blade member 13 is formed on a side portion of the horizontal portion 2b.

As shown in FIGS. 2 and 3, the tube 10 has an outer cylinder 14 having a hemispherical tip, and an inner cylinder 15 provided from the base end to the tip of the outer cylinder 14.
The gap 16 between the outer cylinder 14 and the inner cylinder 15 is used as a flow path for the cooling water W. A lid member 17 is attached to the rear end surface of the tube 10, and is formed at the center of the lid member 17. The distal end of a supply pipe 18 for supplying cooling water is slidably inserted into the inner cylinder 15 through the insertion hole.
An opening member 40 having an outlet 20 for the cooling water W is rotatably mounted via a water-stopping member (for example, a gland packing is used) 41, so that even if the tube 10 rotates around the axis of the horizontal portion 2b, And is supported at a predetermined place so as not to rotate with it.

Further, the middle part of the tube 10 and the supply pipe 1
8 is provided, and the rear portion of the tube 10 is slidably supported on one support plate 22 of the support frame 21 along the axis of the horizontal portion 2b.
The rear part of the supply pipe 18 is held by the other support plate 23.

As shown in FIG. 4, the blade member 13 is
The blade 10 is arranged at a predetermined angle (60 ° in the figure) in the circumferential direction at the distal end of the tube 10, and each blade member 13 is formed in a substantially trapezoidal shape when viewed from the front.
a.

The moving and rotating device 11 includes two support plates 22,
A screw screw 30 rotatably supported between 23;
A drive motor 31 for rotating the screw 30 around its axis, and a rotation of a drive gear 32 attached to the drive shaft of the drive motor 31 are transmitted to a driven gear 33 fitted to an end of the screw 30. Transmission gear 3
The screw screw 30 has a linear keyway 30a formed over its entire length.

The moving and rotating device 11 is provided with a conversion mechanism 35 for converting the rotation of the screw 30 into the rotation and movement of the tube 10. The conversion mechanism 35 fits into the key groove 30 a of the screw 30. A moving gear 36 fitted with a screw (30) having a matching key (not shown) and a moving gear 3 fitted to the end of the tube 10
6 and a pair of nuts arranged on both sides of the moving gear 36 and screwed to the screw 30 and attached to the end of the tube 10 via a bearing (not shown). It is composed of members 38 and 39.

In the above configuration, the exhaust gas generated in the melting furnace main body 1 enters the vertical portion 2a of the exhaust duct 2, and is then guided to the exhaust gas treatment device via the horizontal portion 2a.
First, in the vertical portion 2a, each chain 9 suspended in the vertical portion 2a is rotated by the driving motor 7 along the inner wall surface of the vertical portion 2a, and dust D attached to the inner wall surface is scraped off.

In the case where the dust D attached to the inner wall surface of the vertical portion 2a is scraped off by each chain 9 in this manner,
The tube 10 is retracted by driving the motor for rotating the screw screw 30, and the blade member 13 is
, The rotation of each chain 9 is not hindered.

When dust D attached to the inner wall of the horizontal portion 2b is removed, a tube 10
Then, the drive motor 7 is driven so that the screws 9 can be inserted, the respective chains 9 are positioned, and the drive motor 31 for rotating the screw 30 is driven. Then, the rotation of the drive gear 32 attached to the output shaft of the drive motor 31 is transmitted to the screw 30 via the transmission gear 34, and the key of the moving gear 36 is fitted in the key groove 30a.
The tube 10 rotates around the axis of the horizontal portion 2b by rotating together with the rotation gear 0 and the rotation gear 37 meshing with the movement gear 36.

Further, with the rotation of the screw 30, the nut members 38, 39 move along the screw 30 with the moving gear 36 interposed therebetween, and the nut members 38, 39 are moved.
Is attached to the tube 10, so that the tube 10
Can be moved along the axial direction of the horizontal portion 2b.

As described above, the tube 10 moves along the axis of the horizontal portion 2a, rotates around the axis of the horizontal portion 2a, and the dust D adhered to the inner wall surface of the horizontal portion 2b by the blade member 13. Since the blade member 13 is for scraping off the dust D by rotating, there is no occurrence of a wind force that disrupts the flow rate balance in the melting furnace. It can be used even during operation, and a decrease in operation efficiency can be prevented.

The dust D scraped by the blade member 13 is guided to the dust collecting device by the exhaust gas and is processed. After removing the dust D attached to the inner wall surface of the horizontal portion 2b, the drive motor 31 for rotating the screw 30 is driven again to retract the tube 10, and the blade member 13 is housed in the recess 12.

When the tube 10 is advanced or retracted, there is no support for the blade member 13 at the connecting portion between the vertical portion 2a and the horizontal portion 2b, so that the tube 10 bends. Is formed in a trapezoidal shape, and the oblique side portion and the short side portion are continuous on the arc surface 13a, so that the blade member 13 easily climbs over the corner of the connection portion between the vertical portion 2a and the horizontal portion 2b and moves smoothly. be able to.

The inner wall surface of the exhaust duct 2 is cooled by cooling water flowing in the water cooling jacket to lower the temperature, and the adhesion of the molten or semi-molten dust D is weakened.

The same is true for the tube 10, and the cooling water supplied from the supply pipe 18 into the tube 10 passes through the flow path, lowers the temperature of the tube 10, and is discharged from the outlet 20. Adhesion of dust D is weakened.

As described above, according to the embodiment of the present invention,
The rotation of the tube 10 rotates the blade member 13 to remove the dust D attached to the inner wall surface of the horizontal portion 2b, so that no wind force is generated that would disrupt the flow balance in the melting furnace. Therefore, it can be used even during the operation of the melting furnace, and a decrease in operating efficiency can be prevented.

In the above-described embodiment, the dust D is removed from the inner wall surface of the vertical portion 2a by rotating the chain 9. However, the present invention is not limited to this.
Tube 1 having a blade member 13 attached to the tip along the axis of the vertical portion 2a in the same manner as the horizontal portion 2b instead of using
0, the tube 10 is moved along the axis of the vertical portion 2a and rotated around the axis of the vertical portion 2a, so that the dust D adhered to the inner wall surface of the vertical portion 2a.
May be scraped off. Also in this case, similarly to the above embodiment, it can be used even during the operation of the melting furnace, and it is possible to prevent a decrease in operating efficiency.

[0031]

As is apparent from the above description, according to the present invention, a rod-shaped moving member is movably provided along the axial direction of the exhaust duct, and is rotatably provided around the axial center of the exhaust duct. A blade member for dust removal is attached in a radial direction on the outer cylinder surface constituting the moving member,
Since the dust is removed by rotating the blade member around the axis of the exhaust duct, no wind force is generated in the melting furnace that would disturb the flow rate balance.Thus, even during operation of the melting furnace. It can be used, and a decrease in operating efficiency can be prevented. In addition,
When the inner cylinder is inserted into the outer cylinder,
Fluid flow path is provided, and further on the outer cylinder side,
An opening member having a cooling fluid outlet is provided through a water stopping member.
Because it is rotatably mounted, the outer cylinder,
Move the member in the direction of its axis with respect to the exhaust duct and
Even if it is installed rotatably, the cooling water
The supply can be carried out from the proximal side without hindrance. Further
The blade member provided on the outer periphery of the outer cylinder of the moving member has a trapezoidal shape.
And the oblique and longitudinal sides in the moving direction
Is formed on the arc surface, so that, for example,
At the connection between the vertical and horizontal sections of the air duct,
Even when materials are arranged, the blade members
Can easily move over the
You.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an overall configuration of a dust removing device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the tube.

FIG. 3 is a sectional view showing a state where the opening member and the tube are attached.

FIG. 4 is a front view of the blade member.

FIG. 5 is a cross-sectional view showing the overall configuration of a conventional dust removing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Melting furnace main body 2 Exhaust duct 6 Rotating shaft 7 Drive motor 8 Arm member 9 Chain 10 Tube 11 Moving and rotating device 13 Blade member 13a Arc surface 14 Outer cylinder 15 Inner cylinder 18 Supply pipe 21 Support frame 30 Screw screw 30a Key groove 31 Drive motor 35 Conversion mechanism 36 Moving gear 37 Rotating gear 38 Nut member D Dust W Cooling water

Continuation of the front page (72) Inventor Tadashi Kono 5-3-28 Nishikujo, Konohana-ku, Osaka, Japan Inside Hitachi Zosen Corporation (56) References JP-A-4-103908 (JP, A) JP-A-6 -257735 (JP, A) Fully open 1987-204143 (JP, U) Fully open 1987-88142 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23J 3/02 F23J 1/08

Claims (2)

(57) [Claims] 1. A dust removing device for an exhaust duct for exhausting exhaust gas generated in a melting furnace body, wherein a rod-shaped moving member is movably provided along an axial direction of the exhaust duct. Is provided rotatably about the axis of the exhaust duct, and a blade member for dust removal is attached in a radial direction of the moving member. The moving member includes an outer cylinder having a closed end, An inner cylinder which is inserted from the base end of the outer cylinder so as to have a gap in the cylinder and has an open distal end, and is used for cooling to reduce the adherence of dust to the moving member. A fluid flow path is formed, and a supply pipe for supplying cooling water is slidably inserted through an insertion hole formed at the base end of the inner cylinder, and at the middle of the base end of the outer cylinder. An opening member having an outlet for the cooling fluid, Dust removal apparatus of the exhaust duct at a high temperature melting furnace, characterized in that rotatably mounted via. 2. A blade member provided on an outer periphery of an outer cylinder of a moving member is formed in a trapezoidal shape in a side view, and a connecting portion between a front and rear oblique side and a short side in a moving direction is formed in an arc surface. The dust removing apparatus for an exhaust duct in a high-temperature melting furnace according to claim 1, wherein: