JPH06257735A - Dust removing device of exhaust duct - Google Patents

Abstract

PURPOSE:To provide a small-sized and compact dust removing device capable of performing the dust removing in an exhaust duct by scraping plates. CONSTITUTION:A rod 11 penetrating an edge wall 4 of an exhaust duct, inserted into the duct, and extended in the duct longitudinal direction is rotatably supported around a center axis 16 so as to be longitudinally reciprocated, and scraping plates 13a, 13b, 13c, 13d whose top edge parts are faced to the duct inner surface are fixed to the rod 11 at the fixed attachment pitch P, moreover a reciprocating driving device 21 reciprocating the rod 11 by the stroke S larger than the attachment pitch P and a rotating driving device 31 rotating and driving the rod are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing dust adhering and depositing in an exhaust duct having a large dust content in the exhaust, such as an exhaust duct of a furnace for incineration ash melting.

[0002]

2. Description of the Related Art Recently, incineration ash of various wastes such as municipal solid waste and sewage sludge is subjected to an arc-type melting furnace using a base metal and a jig heat in order to reduce and stabilize the volume. In many cases, it was put into a direct current type melting furnace to be used and melted. However, in these incinerator ash melting furnaces,
A large amount of dust is contained in the exhaust gas, and this dust adheres and accumulates in the exhaust duct, causing a duct clogging accident in a short time and interrupting the operation of the melting furnace.
In particular, dust is remarkably accumulated in the horizontal duct, and the surface of this dust is melted by the high temperature gas, and the dust is accumulated on the surface and the molten solidified layer grows. is there.

Therefore, the applicant has proposed a dust removing device disclosed in Japanese Patent Laid-Open No. 4-103908 as a solution to the above problems. This device has a great advantage that dust adhering and depositing in the exhaust duct can be automatically removed even during operation of the furnace, which is a dust generation source.

[0004]

However, among the devices disclosed in the above publications, the dust scraping device for the horizontal duct portion reciprocally drives the rod to which the scraping plate is attached for a distance close to the length of the duct. A large installation space in the horizontal direction is required outside the driving side end, and interference with other devices such as a gas cooling tower and the building frame may be a problem, and miniaturization has been desired.

The present invention has been made in view of the above points, and an object thereof is to provide a small and compact dust removing device capable of removing dust from an exhaust duct by means of a scraping plate.

[0006]

In order to achieve the above object, a dust removing device for an exhaust duct according to the present invention has a rod which penetrates an end wall of the exhaust duct and is inserted into the duct and extends in a longitudinal direction of the duct. A plurality of scraping plates, which are reciprocally movable in the longitudinal direction and rotatable about the central axis and whose tip faces the inner surface of the duct, are fixed to the rod with a predetermined mounting pitch, and the rod is mounted to the rod. It is characterized by comprising a reciprocating drive device for reciprocating with a stroke larger than the pitch and a rotary drive device for rotatively driving the rod.

[0007]

In the dust removing device of the present invention, the rod is scraped in one predetermined direction by the reciprocating drive device with the scraping plate tip end facing the bottom of the duct inner peripheral surface which is the dust accumulation part of the duct. The rod is moved forward by a predetermined stroke larger than the mounting pitch of the plate, dust is scraped off, and then the rod is rotated by a predetermined angle, for example, 180 degrees by a rotary drive device, and then the rod is retracted by the stroke, thereby rotating the rod. After rotating again to return to the initial state, the above steps are repeated.

Thus, the dust scraped off by the scraping plate is sequentially forwarded intermittently by the front scraping plate and discharged in one direction. Since the rod reciprocal stroke need only have a length that exceeds the mounting pitch of the scraping plate by a small distance, the space required for installing the reciprocating drive unit of the rod in the driving direction can be small, especially the number of scraping plates. The more there are installation spaces
The effect of reducing gas consumption is great.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, 1 is an exhaust vertical duct whose lower end is connected to an exhaust port of an incinerator ash melting furnace (not shown), 2 is a horizontal exhaust duct in which an inlet 2a is connected to the upper end of this vertical duct 1, and 3 is this It is the inlet of the gas cooling tower connected to the outlet 2b of the horizontal duct 2.

Reference numeral 10 denotes a dust removing device, which is a rod 11 which extends through the central portion of the rear end wall 4 on the rear side of the horizontal duct 2 and is inserted into the duct to extend in the horizontal direction. Four scraping plates 13a to 13 in the shape of a fan-shaped plate (partial disc) with windows facing each other with a small clearance on the inner surface 5 of the duct.
The base portion of d is fixed by a mounting pitch P. The window 14 of the scraping plate 13 (collective name of the scraping plates 13a to 13d).
Is to reduce the ventilation resistance of the exhaust gas flow,
It can be omitted.

In this embodiment, the front end portion 11a of the rod 11 penetrates the front end wall 6 of the horizontal duct 2 and projects to the outside, and this projection portion has a grooved rod axially supported by the end wall 6. -Guided by la 15, 15 and rod 1
The rear end portion 11b of the No. 1 is flange-coupled to the drive shaft 32 of the rotary drive unit 31 provided on the carriage 22 of the reciprocal drive unit 21, whereby the rod 11 can reciprocate in the horizontal direction and the central axis line. It is rotatably supported around 16.

The reciprocating drive device 21 has a frame 24 fixed on a base 23 fixed on a foundation, and runs horizontally along the guide rails 25, 25 above the frame 24. And a driven sprocket 2 driven by a motor 26 in a chain.
Both ends of the chain 29 wound around 8 are connected to the carriage 22.

In the rotary drive device 31, a drive shaft 32 is mounted on a frame 33 fixed on the carriage 22 and bearings 34, 34 are provided on the drive shaft 32.
A sprocket 35, which is rotatably supported by means of a motor and is fixed to the intermediate portion of the drive shaft 32, is chain driven by a motor 36.

The rod 11 and the drive shaft 32 are both hollow tubular bodies, and the water supply port 17 attached to the front end 11a of the rod 11 and the drain port 18 attached to the rear end of the drive shaft 32 are not shown. It is connected to a cooling water supply source and a drainage pipe via a rotary joint and a hose. The scraping plate 13 also has a hollow shape as shown in FIG. 2, and the cooling water flow passage 19 inside the hollow portion and the rod 11 is provided.
And the rod 11 and the scraping plate 13 are water-cooled by the cooling water flowing from the water supply port 17 to the drain port 18. The horizontal duct 2 also has a double wall structure as shown in FIG. 2 and is water-cooled.

In order to remove dust by the dust removing device 10 having the above-mentioned structure, first, as shown by the solid line in each figure, the scraping plate 13 is suspended and the rod 11 is moved from the retracted state to the reciprocating drive device. A stroke larger than the mounting pitch P of the scraping plate 13 in the forward direction indicated by the arrow X by 21 is used.
Drive forward only by S. As a result, the dust accumulated on the bottom surface of the horizontal duct 2 is scraped and advances, and for example, the scraping plate 13a advances to the position shown by the chain line 41, whereby the dust accumulation layer 42 is formed.

Then, the rod 11 is driven by the rotary drive device 31.
Is rotated 180 degrees so that the scraping plate 13 is lifted upward. As a result, for example, the scraping plate 13a is attached to the chain line 4
The state shown by 3 is obtained. Next, when the rod 11 is retracted in the direction of the arrow Y by the reciprocating drive device 21, the scraping plate 13 is retracted without interfering with the dust accumulation layer at the bottom of the duct, and then the rod 11 is further rotated by 180 degrees. May be performed), the scraping plate 13 returns to the initial state, and the above steps are repeated.

At the time of advancing the rod 11, the dust accumulation layer 42 formed last time is scraped out in the advancing direction by the stroke P by the scraping plate 13b, and thereafter the rod advancing by the scraping plate 13 on the front side. At times, it is intermittently driven and extruded in the forward direction, and is discharged into the incinerator ash melting furnace from the inlet 2a through the vertical duct 1 as shown by an arrow W.

The drive stroke S of the rod 11 by the reciprocating drive device 21 is the chain line 4 by only one scraping plate 13a.
Compared to the case of scraping dust to the position shown by 4, it is about 1 /
4, the space for installing the reciprocating drive device 21 in the horizontal direction is greatly reduced.

When only the exhaust gas is flown without removing dust, the scraping plate 13 may be held in either a downward or upward state.

Next, FIG. 4 shows another embodiment of the present invention.
The upward outlet 2b of the horizontal duct 2 is connected to the lower end of the vertical duct 7, and a scraping plate 13a is located near the end wall 6 when retracting in order to scrape dust at the bottom of the duct below the outlet 2b. As described above, since it is fixed to the rod 11 and the other structure is the same as that of the above-mentioned embodiment, the same parts as those in FIG.

Also in the dust removing device 50 of this embodiment, the dust at the bottom of the duct can be scraped off by the same operation as in the above embodiment. Further, since the scraping plate 13a is retracted in the upward state, it is rotationally driven at the retracted end and becomes downward, so that dust particles are not provided between the end wall 4 and the scraping plate 13a as when retracting while keeping the downward direction. It is possible to use it for a long time without any trouble without causing an accident such that the two are attracted to each other and accumulated, and they are fixed to each other or prevent the rod from retreating.

The present invention is not limited to the above-mentioned respective embodiments. For example, in the above-mentioned embodiments, since the both-end support structure also supports the front end portion 11a of the rod 11, the centering of the rod 11 is easy. It is suitable for a long duct length, but it is also possible to omit the rod portion in front of the foremost scraping plate (in the embodiment, scraping plate 13d) to form a cantilevered rod. In the case, the rod 11 has one end wall 4
Will only penetrate. Further, the reciprocating drive device and the rotary drive device may have a configuration other than the above, and gas may be used for cooling the rod and the scraping plate, or cooling may be omitted when the exhaust gas temperature is low.

Although the horizontal exhaust duct of the incinerator ash melting furnace has been described above, the present invention can also be applied to the exhaust duct of the furnace for other purposes and the inclined exhaust duct whose longitudinal direction is inclined.

[0024]

As described above, according to the present invention,
A reciprocal stroke of the rod having the scraping plate attached thereto is small, and a small and compact dust removing device requiring a small installation space for the rod driving device can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an exhaust duct provided with a dust removing device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a side view taken along the line BB of FIG.

FIG. 4 is a view corresponding to FIG. 1 showing another embodiment of the present invention.

[Explanation of reference numerals] 2 ... Horizontal duct, 4 ... End wall, 5 ... Duct inner surface, 10 ... Dust removing device, 11 ... Rod, 12 ... Tip portion, 13a ...
13d ... scraping plate, 15 ... roller with groove, 16 ... central axis line, 21 ... reciprocating drive device, 22 ... carriage, 24 ... frame
A motor 26, a motor 29, a chain 31, a rotary drive device 32, a drive shaft 33, a frame 35, a sprocket 36, a motor 50, a dust removing device.

Claims (1)

[Claims] 1. A rod, which penetrates through an end wall of an exhaust duct and is inserted into the duct and extends in the longitudinal direction of the duct, supports a rod reciprocating in the longitudinal direction and rotatable about a central axis, and a tip portion of the duct. A plurality of scraping plates facing the inner surface are fixed to the rod with a predetermined mounting pitch, and a reciprocating drive device that reciprocally drives the rod with a stroke larger than the mounting pitch, and a rotational drive that rotationally drives the rod. And a device for removing dust from an exhaust duct.