JP2008157613A - Flue gas cooling tower and dust scraper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust scraper capable surely discharging dust with less power and a flue gas cooling tower having the dust scraper. <P>SOLUTION: This flue gas cooling tower in place of conventional flue gas cooling towers for cooling flue gas containing dust comprises a cooling tower body having a circular bottom surface in which a discharge port for discharging dust is formed and an inner wall surface upwardly raised from the bottom surface and a dust scraper having a scraper mounting frame attached to the center of the bottom surface and rotated around the vertical axis, a scraper which is a member attached to the scraper mounting frame, and a drive mechanism for rotating the scraper mounting frame. The scraper is mounted on the scraper mounting frame. The tower longitudinally has a scraper frame which is a longitudinal member along the radial direction of the bottom surface and vane plates which are supported by the scraper frame and serving as the plates for scraping the dust accumulated at the bottom surface by the edges thereof facing downward. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a dust scraper that scrapes and discharges dust accumulated on the bottom surface of a cylindrical structure. In particular, the present invention relates to a dust collector suitable for an exhaust gas cooling tower that cools an exhaust gas containing dust, and to an exhaust gas cooling tower provided with the dust collector.

In various plants, an exhaust gas cooling tower is sometimes used to cool high-temperature exhaust gas containing dust.
The exhaust gas cooling tower performs water injection near the inlet for introducing the high temperature exhaust gas, and makes the spray cooling water and the high temperature exhaust gas come into gas-liquid contact. The temperature-reduced exhaust gas descends in the exhaust gas cooling tower, is discharged from the lower side, and is sent to, for example, a downstream dust collector. Part of the dust in the exhaust gas collects on the floor of the exhaust gas cooling tower.

A dust scraper is provided at the bottom of the ash gas cooling tower, and discharges dust accumulated on the bottom from a dust discharge port provided on the floor.
The dust scraper includes a scraper mounting frame, a scraper, and a drive mechanism.
The scraper mounting frame is a structure that rotates at the center of the floor surface. A scraper is attached to the scraper mounting frame with its longitudinal direction horizontal. As the scraper mounting frame rotates, the scraper sweeps away dust accumulated at the bottom. The dust is swept away by a scraper and discharged from the dust discharge port to the outside. A double damper is provided at the dust outlet to cut out the discharged dust.

Depending on the properties of the dust and the amount of water to be sprayed, the adhesion of the dust increases, and the dust tends to adhere to the bottom surface and the inner wall surface.
As dust adherence increases, the scraper receives great resistance from the dust, and a large force is required to rotate the scraper.
If the dust adhering to the bottom surface or the inner wall surface becomes hard, the force required to rotate the scraper further increases, and the drive mechanism that drives the scraper may stop.

Ishikawa Yasuaki, “Practical Design of Fluidized-bed Waste Incinerator”, Augmented Revised Edition, Japan, Industrial Publishing Company, August 20, 1994, page 134, Fig. 3.7-1

  Therefore, even if the stickiness of the dust accumulated in the exhaust gas treatment tower such as the exhaust gas cooling tower is increased, the dust collector capable of reliably discharging the dust with less power and the exhaust gas equipped with the dust collector A cooling tower was requested.

  The present invention has been devised in view of the above-mentioned problems, and replaces the conventional exhaust gas cooling tower for cooling exhaust gas containing dust, and is capable of reliably discharging dust with less power. To provide an exhaust gas cooling tower equipped with a duster and its dust collector.

  In order to achieve the above-mentioned object, an exhaust gas cooling tower for cooling exhaust gas containing dust according to the present invention has a bottom surface provided with a discharge port for discharging dust and an inner wall surface rising upward from the bottom surface. A duster having a main body, a scraper mounting frame that is attached to the bottom surface and rotates about a vertical axis, a scraper that is a member attached to the scraper mounting frame, and a drive mechanism that rotates the scraper mounting frame. The scraper is attached to the scraper mounting frame and is a scraper frame which is a longitudinal member having a longitudinal direction along the horizontal direction, and a plurality of plates which are supported by the scraper frame and sweep the dust accumulated on the bottom surface with an edge facing downward. And with the slats.

  According to the configuration of the present invention, the cooling tower body has a bottom surface provided with a discharge port for discharging dust and an inner wall surface rising upward from the bottom surface, and a scraper mounting frame is mounted on the bottom surface around the vertical axis. The scraper is mounted on the scraper mounting frame, the drive mechanism rotates the scraper mounting frame, the scraper frame is mounted on the scraper mounting frame, and is a longitudinal member having a longitudinal direction along the horizontal direction. The plate is supported by the scraper frame and sweeps the dust accumulated on the bottom surface with the edge facing downward, so that the scraper mounting frame rotates, the scraper frame moves above the bottom surface, and a plurality of the scraper frames supported by the scraper frame The slats sweep away dust accumulated on the bottom surface, and exhaust gas dust accumulated on the bottom surface is exhausted. Asked wear to the mouth.

Further, in the exhaust gas cooling tower according to the present invention, a plurality of the blade plates are arranged at a predetermined angle in the longitudinal direction of the scraper frame, with the surfaces intersecting the moving direction of the scraper frame at a predetermined angle. It is preferable.
With the configuration of the present invention described above, the plurality of blades arranged at predetermined intervals in the longitudinal direction cross the surface at a predetermined angle in the direction in which the scraper frame moves, so that each blade has dust. The resistance force to sweep is small, the resistance torque acting on the scraper frame is small, and the scraper mounting frame can rotate with a small torque.

Further, in the exhaust gas cooling tower according to the present invention, each of the blades sweeps a floor region that is a belt-like region of the floor surface as the scraper mounting frame rotates, and the floor regions overlap each other to form the floor. It is preferable that the surface is substantially covered.
According to the configuration of the present invention, the floor regions overlap each other and substantially cover the floor surface, so that the dust accumulated on the bottom surface can be swept by moving the plurality of blades.

Further, in the exhaust gas cooling tower according to the present invention, when the pitch circle whose center is the vertical axis and the arc extends over the discharge port is assumed, each time the scraper mounting frame rotates, the vane plate collects dust in the pitch circle. It is preferable to sweep toward the arc.
According to the configuration of the present invention, the blades sweep the dust toward the arc of the pitch circle every time the scraper mounting frame rotates, so that the dust collects on the arc of the pitch circle and is sequentially discharged from the discharge port. Is done.

Furthermore, in the exhaust gas cooling tower according to the present invention, it is preferable that the edge facing the lower side of the blade plate is made of a series of concave and convex portions.
According to the configuration of the present invention, the edge facing downward of the slat is made of a series of recesses and projections, so the resistance to sweep dust in the recesses is smaller than the resistance to sweep dust in the projections. The resistance force of the individual blades to sweep dust is smaller, the resistance torque acting on the scraper frame is smaller, and the scraper mounting frame can rotate with less torque.

Furthermore, the exhaust gas cooling tower according to the present invention preferably has a scratching claw that is a plate that the scraper is supported by the scraper frame and scratches dust adhering to the inner wall surface with an edge facing the inner wall surface.
With the configuration of the present invention, the scratching claw is supported by the scraper frame and scratches the dust adhering to the inner wall surface with the edge facing the inner wall surface, so that the dust adhering to the inner wall surface collapses and falls to the bottom surface, Sequentially discharged from the outlet.

Further, in the exhaust gas cooling tower according to the present invention, the scraper has a plurality of scratching claws which are plates supported by the scraper frame and scratching dust adhering to the inner wall surface with an edge facing the inner wall surface, It is preferable that the scratching nails are arranged vertically with a predetermined interval.
According to the configuration of the present invention, since the plurality of scratching nails are arranged at predetermined intervals in the upper and lower directions, the resistance force of the individual scratching nails to scratch the dust is small, the resistance torque acting on the scraper frame is small, and the scraper The mounting frame can rotate with less torque.

Furthermore, in the exhaust gas cooling tower according to the present invention, it is preferable that the scratching claws face the surface up and down.
According to the configuration of the present invention, since the surface of the scratching claw is directed vertically, the resistance force of the dust acting on the surface of the scratching nail is small, the resistance torque acting on the scraper frame is small, and the scraper mounting frame has a small torque Can be rotated with.

Further, in the exhaust gas cooling tower according to the present invention, it is preferable that each scratching claw scratches an inner wall region that is a band-like region of the inner wall surface as the scraper mounting frame rotates, and the inner wall regions do not overlap each other. .
According to the configuration of the present invention, since the inner wall regions do not overlap each other, the scraping claw scrapes off dust adhering to the inner wall region as the scraper mounting frame rotates, and the remaining dust falls by its own weight. The dust adhering to the inner wall surface can be scraped off with low power.

  In order to achieve the above object, dust accumulated in an exhaust gas treatment tower having a bottom surface provided with a discharge port for discharging dust according to the present invention and an inner wall surface rising upward from the bottom surface is scraped to the discharge port. A scraper mounting frame that is attached to the bottom surface and rotates about a vertical axis; a scraper that is a member attached to the scraper mounting frame; and a drive mechanism that rotates the scraper mounting frame. A scraper frame that is a scraper frame that is attached to the scraper mounting frame and that is a longitudinal member whose longitudinal direction is parallel to the horizontal direction, and a plurality of blades that are supported by the scraper frame and sweep the dust accumulated on the bottom surface with an edge facing downward And with.

  According to the configuration of the present invention, the scraper mounting frame is mounted on the bottom surface and rotates about the vertical axis, the scraper is mounted on the scraper mounting frame, the drive mechanism rotates the scraper mounting frame, and the scraper frame is mounted on the scraper frame. It is a longitudinal member that is attached to the frame and has a longitudinal direction along the horizontal direction, and a plurality of blades are supported by the scraper frame and sweeps the dust accumulated on the bottom surface with the edge facing downward, so that the scraper attachment frame rotates. The scraper frame moves on the upper surface of the bottom surface, the plurality of blades supported by the scraper frame sweeps the dust accumulated on the bottom surface, and the exhaust gas dust accumulated on the bottom surface is attracted to the discharge port.

Further, in the dust scraper according to the present invention, a plurality of the blade plates are arranged at a predetermined interval in the longitudinal direction of the scraper frame, with the surfaces intersecting the moving direction of the scraper frame at a predetermined angle. Is preferred.
With the configuration of the present invention described above, the plurality of blades arranged at predetermined intervals in the longitudinal direction cross the surface at a predetermined angle in the direction in which the scraper frame moves, so that each blade has dust. The sweeping force is small, the resistance torque acting on the scraper frame is small, and the scraper mounting frame can rotate with a small torque.

Furthermore, in the dust scraper according to the present invention, each of the blades sweeps a floor region that is a band-like region of the floor surface as the scraper mounting frame rotates, and the floor regions overlap each other to form the floor. It is preferable that the surface is substantially covered.
According to the configuration of the present invention, the floor regions overlap each other and substantially cover the floor surface, so that the dust accumulated on the bottom surface can be swept by moving a plurality of blades.

Furthermore, in the dust scraper according to the present invention, when the pitch circle whose center is the vertical axis and the circular arc extends over the discharge port is assumed, each time the scraper mounting frame rotates, the blades remove the dust into the pitch circle. It is preferable to sweep toward the arc.
According to the configuration of the present invention, the blades sweep the dust toward the arc of the pitch circle every time the scraper mounting frame rotates, so that the dust collects on the arc of the pitch circle and is sequentially discharged from the discharge port. Is done.

Furthermore, in the dust scraper according to the present invention, it is preferable that the edge facing the lower side of the vane plate is made of a series of concave and convex portions.
According to the configuration of the present invention, the edge facing downward of the slat is made of a series of recesses and projections, so the resistance to sweep dust in the recesses is smaller than the resistance to sweep dust in the projections. The individual blades sweep less dust, the resistance torque acting on the scraper frame is smaller, and the scraper mounting frame can rotate with less torque.

Furthermore, it is preferable that the dust scraper according to the present invention has a scraping nail which is a plate in which the scraper is supported by the scraper frame and scratches the dust attached to the inner wall surface with an edge facing the inner wall surface.
According to the configuration of the present invention, the scratching claw scratches the dust attached to the inner wall surface supported by the scraper frame at the edge facing the inner wall surface, so that the dust attached to the inner wall surface collapses and falls to the bottom surface, sequentially. It is discharged from the outlet.

Furthermore, the dust scraper according to the present invention has a plurality of scraping claws which are plates that scrape the dust attached to the inner wall surface supported by the scraper frame at the edge facing the inner wall surface, It is preferable that the nail | claws are arrange | positioned at predetermined intervals up and down.
According to the configuration of the present invention, since the plurality of scratching nails are arranged at predetermined intervals in the upper and lower directions, the resistance force of the individual scratching nails to scratch the dust is small, the resistance torque acting on the scraper frame is small, and the scraper The mounting frame can rotate with less torque.

Furthermore, in the dust scraper according to the present invention, it is preferable that the scraper has its surface directed up and down.
According to the configuration of the present invention, since the surface of the scratching claw is directed vertically, the resistance force of the dust acting on the surface of the scratching nail is small, the resistance torque acting on the scraper frame is small, and the scraper mounting frame has a small torque Can be rotated with.

Furthermore, in the dust scraper according to the present invention, it is preferable that each scraping claw scratches an inner wall region which is a belt-like region of the inner wall surface as the scraper mounting frame rotates, and the inner wall regions do not overlap each other.
According to the configuration of the present invention, the inner wall regions do not overlap each other, so that the scratching claw scrapes off dust adhering to the inner wall region of the inner wall surface as the scraper mounting frame rotates, and the remaining dust falls by its own weight. Therefore, the dust adhering to the inner wall surface can be scraped off with less power.

As described above, the exhaust gas cooling tower and the dust collector according to the present invention have the following effects due to their configurations.
Since the scraper frame is provided with a plurality of blades that sweep dust, the scraper frame attached to the scraper mounting frame rotates on the top of the bottom surface, and the dust that the blades supported by the scraper frame accumulate on the bottom surface. The dust of the exhaust gas that has been swept up and accumulated on the bottom is attracted to the outlet.
Further, since the plurality of blades are arranged with a predetermined angle in the direction in which the scraper frame moves and at a predetermined interval in the longitudinal direction, each blade has a resistance to sweeping dust. The resistance torque acting on the scraper frame is small, and the scraper mounting frame can rotate with a small torque.
Further, since the floor regions overlap each other and almost cover the floor surface, dust accumulated on the bottom surface can be swept.
Further, each time the scraper mounting frame rotates, the blades sweep the dust toward the arc of the pitch circle, so that the dust collects on the arc of the pitch circle and is sequentially discharged from the discharge port.
Further, since the edge facing downward of the vane plate is formed by a series of concave and convex portions, the resistance force of each vane plate to sweep dust is smaller, the resistance torque acting on the scraper frame is smaller, and the scraper The mounting frame can rotate with less torque.
Further, since the scratching claw scratches the dust attached to the inner wall surface supported by the scraper frame with the edge facing the inner wall surface, the dust attached to the inner wall surface collapses and falls to the bottom surface and is sequentially discharged from the discharge port. .
In addition, since the scratching claw is arranged at a predetermined interval in the vertical direction, the resistance of each scratching claw to scratch the dust is small, the resistance torque acting on the scraper frame is small, and the scraper mounting frame rotates with a small torque. it can.
Further, since the surface of the scratching claw is directed vertically, the resistance force of dust acting on the surface of the scratching plate is small, the resistance torque acting on the scraper frame is small, and the scraper mounting frame can rotate with a small torque.
In addition, since the inner wall regions do not overlap each other, the scraper claw scrapes off the dust adhering to the inner wall region of the inner wall surface as the scraper mounting frame rotates, and the remaining dust falls by its own weight, so it is possible to use less power. Dust adhering to the inner wall surface can be scraped off.
Therefore, it is possible to provide a dust collector that can reliably discharge dust with less power and an exhaust gas cooling tower that includes the dust collector.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

  An exhaust gas cooling tower according to an embodiment of the present invention will be described. FIG. 1 is an overall front view of an exhaust gas cooling tower according to an embodiment of the present invention. FIG. 2 is a partial front view of the exhaust gas cooling tower according to the embodiment of the present invention. FIG. 3 is a plan sectional view of the exhaust gas cooling tower according to the embodiment of the present invention. FIG. 4 is a partial detailed view 1 of an exhaust gas cooling tower according to an embodiment of the present invention. FIG. 5 is a partial detail view 2 of the exhaust gas cooling tower according to the embodiment of the present invention. FIG. 6 is a partial detail view 3 of the exhaust gas cooling tower according to the embodiment of the present invention.

The exhaust gas cooling tower 1 is a device that cools the exhaust gas G containing dust, and includes a cooling tower body 2, a water spray device 3, a dust collector 4, and a dust discharge mechanism 5.
The cooling tower body 2 is a device having a circular bottom surface F provided with a discharge port M for discharging dust, and an inner wall surface H rising upward from the bottom surface. With a fireproof structure.
The normal cooling tower body 2 is a cylindrical structure standing vertically, and is provided with an exhaust gas inlet at the upper part and an exhaust gas outlet at the lower side surface.

The water spray device 3 is a device that sprays water into the cooling tower body 2.
The water spray device 3 includes a plurality of nozzles penetrating the side wall at the upper part of the side wall of the cooling tower body 2 and directing the injection port inside.
The exhaust gas enters from the exhaust gas inlet, is cooled by direct contact with water sprayed by the water spray device 3, descends inside the cooling tower body 2, and exits from the exhaust gas outlet. At that time, dust in the exhaust gas accumulates on the bottom surface of the cooling tower body 2.

The dust scraper 4 is a device that scrapes dust accumulated on the bottom surface F of the cooling tower body 2 and collects it at the discharge port M.
The dust scraper 4 rotates around the vertical axis, sweeps over the bottom surface F, and collects dust at the discharge port M.
The dust is scraped by the dust scraper 4 and falls down from the discharge port M.

  The dust discharge mechanism 5 is a device that cuts out dust that has fallen into the discharge port M. The dust discharge device 5 is a double damper, for example, and periodically discharges dust.

Next, the structure of the dust scraper 4 will be described in detail.
The dust scraper 4 includes a scraper mounting frame 10, a scraper 20, and a drive mechanism 30.
The scraper mounting frame 10 has a structure that is mounted on the center portion of the bottom surface F and rotates around a vertical axis. A rotational drive shaft of a drive mechanism 30 to be described later is attached to the center portion of the bottom surface F with the rotational shaft vertical, and the scraper mounting frame 10 is fixed to the rotational drive shaft and rotates.
A conical umbrella-like structure is provided on the upper part of the scraper mounting frame 10. The cone bus is tilted beyond the angle of repose of the dust.
A flange for fixing a scraper 20 described later is provided on a side surface of the scraper mounting frame 10.
FIG. 3 shows four scrapers 20 attached to the scraper mounting frame 10.

The scraper 20 is supported by the scraper mounting frame 10 and rotates to sweep the dust on the floor surface F. The scraper 20 includes a scraper frame 21, a plurality of blade plates 22, a plurality of scratching claws 23, and a blade plate support 24. The
The scraper frame 21 is a longitudinal member whose one end is attached to the scraper mounting frame 10 and whose longitudinal direction is along the horizontal direction.
2 and 3 show four scraper frames 21 attached to the flanges of the scraper mounting frame 10, respectively. The scraper frame 21 is manufactured by welding steel plates, and has a shape in which a plate whose surface is set up vertically is bent into a rectangle when viewed from above.

The vane plate 22 is a plate that is supported by the scraper frame 21 and sweeps dust accumulated on the bottom surface F with an edge facing downward.
An edge facing the lower side of the vane plate is formed by a series of concave portions a and convex portions b.
FIG. 5 shows a slat 22 whose lower edge is formed by a series of rectangular recesses a and rectangular projections b and whose upper part is supported by a scraper frame 21.
A plurality of blades 22 are arranged with their surfaces intersecting at a predetermined angle in the direction in which the scraper frame moves, and at predetermined intervals in the radial direction. That is, when the reference line in the longitudinal direction of the scraper frame intersects the vertical axis of rotation of the scraper mounting frame, the surfaces of the plurality of blade plates 22 are at a predetermined angle (for example, 5 degrees) in the direction perpendicular to the reference line of the scraper frame. Intersect at 30 degrees).
Furthermore, the lower part of the side edge of the slat 22 arranged on the outermost periphery is made of a series of concave parts a and convex parts b.
In FIG. 4, the lower edge is made up of a series of rectangular recesses a and rectangular projections b, the side edge is made up of a series of triangular depressions a and triangular projections b, and the upper part is a scraper. A blade 22 supported by the frame 21 is shown.

When a pitch circle L having an arc centering on the vertical axis and straddling the discharge port M is imagined, the blade 24 sweeps dust toward the arc of the pitch circle L every time the scraper mounting frame 10 rotates.
In FIG. 7, a state in which the blade 22 sweeps dust in the direction of the arc of the pitch circle L is indicated by a white arrow.
Each of the blades 22 sweeps the floor surface F in a band shape as the scraper mounting frame 10 rotates. The belt-like region of the floor surface F is temporarily called a floor region D. The floor regions F of the blades 22 of the scrapers 20 overlap each other and cover almost the entire floor surface F. “Almost the whole” means that the central portion of the floor surface is excluded.
In FIG. 3, four scrapers 20 are evenly arranged on the circumference of the scraper mounting frame 10, and a plurality of blades 22 are arranged in the radial direction of each scraper frame 21 at different intervals for each scraper 20. It is shown. Accordingly, each blade 22 sweeps the bottom surface F in a band shape, and the band-shaped regions overlap with each other while having an overlapping portion, thereby covering the bottom surface F as a whole.

The scratching claw 23 is a plate that is supported by the scraper frame 21 and scratches dust adhering to the inner wall surface H with an edge facing the inner wall surface.
The scratching claw 23 is fixed to the scraper frame 21 with its surface facing up and down.
FIG. 6 shows three scratching claws 23 fixed to the scraper frame 21 with bolts.
The scraper claw 23 supported by each scraper frame 21 scratches the inner wall surface H in a band shape as the scraper mounting frame 10 rotates. This belt-like region is temporarily called an inner wall region E. It is preferable that the inner wall regions E of the scratching claws 23 for each scraper do not overlap.
For example, the three scratching claws 23 shown in FIG. 6 are set as one set, and four sets of the scratching claws 23 are fixed to the four scraper frames at different height positions.

  The blade support 24 is a member that fixes an intermediate portion of the blade 22 and fixes the blade 22.

The drive mechanism 30 is a device that rotationally drives the scraper mounting frame 10.
The drive mechanism 30 has a rotating shaft whose axis is vertical and power for rotating the rotating shaft.
The rotation shaft projects to the center of the bottom surface F and supports the scraper mounting frame 10.

Next, the operation of the exhaust gas cooling tower and its dust collector will be described.
FIG. 7 is an operation explanatory view of the dust scraper according to the embodiment of the present invention.
Hot exhaust gas G enters the exhaust gas cooling tower body 2 from the exhaust gas inlet. The exhaust gas G directly contacts the water sprayed by the water injection device 3 while descending the interior of the exhaust gas cooling tower body 2, lowers the temperature, and exits from the exhaust gas exhaust port.
Dust in the exhaust gas G adheres to the inner side surface H and falls on the bottom surface F. The dust falling on the scraper mounting frame 10 slides on the umbrella-like structure and falls on the floor surface F.
The drive mechanism 30 rotates the scraper mounting frame 10 around the vertical axis.
The scraper 20 rotates on the floor surface F around the rotation axis.
The lower edge of the slat 22 sweeps away dust accumulated on the bottom surface F. The dust is swept by the blade plate 22 and moves in the direction of the arc of the pitch line L while moving in the direction of rotation about the rotation axis. The dust sequentially enters the discharge port M while being swept by the plurality of blades 22.
Dust adheres to the inner wall surface H.
The scratching claw 23 scrapes off dust adhering to the inner wall region E of the inner wall surface H.
When the plurality of scratching claws 23 write down the dust in the inner wall region E, the dust that adheres to the inner wall surface H and remains in a strip shape collapses by its own weight.
The fallen dust is swept to the lower edge of the slat 22 and attracted to the discharge port M.
After a certain amount of dust has accumulated in the discharge port M, the dust is cut out by the dust discharge mechanism 5.

If the dust scraper of the above-mentioned embodiment and the exhaust gas cooling tower provided with this dust scraper are used, the dust accumulated on the bottom surface can be scraped with a small amount of power.
Further, since the plurality of blade plates are arranged so as to intersect at a predetermined angle in the direction in which the scraper frame moves, the resistance of dust acting on the blade plates is small, and a large amount of dust can be scraped with little power.
In addition, since the floor areas to which the respective blades are gathered overlap each other and substantially cover the floor surface, the dust on the floor surface can be scraped with a little power.
In addition, since the dust is scraped in the direction of the arc of the pitch circle while each blade is moving, the dust can be efficiently guided to the discharge port.
In addition, since the lower edge of the slats is made of a series of concave and convex parts, there is little resistance applied to the slats and less power is required to rotate the scraper.
Moreover, since the scratching claw is provided for scratching the side wall, dust adhering to the side wall can be scraped off.
Further, since the scratching claw is facing upward and the inner wall region where the scratching claw scratches does not overlap, the resistance force acting on the entire scratching claw is small, and the power for rotating the scraper is small.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention.
Although the dust scraper has been described by taking the water direct contact type exhaust gas cooling tower as an example, the present invention is not limited to this and can be applied to other exhaust gas treatment towers.
Although the bottom surface of the exhaust gas cooling tower has been described as being circular, the present invention is not limited to this, and for example, a spectacle type in which a circle having a bottom surface of 2 partially overlaps may be used.

1 is an overall front view of an exhaust gas cooling tower according to an embodiment of the present invention. It is a partial front view of the exhaust gas cooling tower which concerns on embodiment of this invention. It is a plane sectional view of an exhaust gas cooling tower concerning an embodiment of the present invention. FIG. 3 is a partial detail view 1 of an exhaust gas cooling tower according to an embodiment of the present invention. FIG. 3 is a partial detail view 2 of the exhaust gas cooling tower according to the embodiment of the present invention. FIG. 3 is a partial detail view 3 of the exhaust gas cooling tower according to the embodiment of the present invention. It is operation | movement explanatory drawing of the dust scraper which concerns on embodiment of this invention.

Explanation of symbols

a concave portion b convex portion D floor region E inner wall region F floor surface G exhaust gas H inner wall surface W water 1 exhaust gas cooling tower 2 exhaust gas cooling tower body 3 water injection device 4 dust collector 5 dust discharge mechanism 10 scraper mounting frame 20 scraper 21 scraper Frame 22 Blade plate 23 Shaving claw 24 Blade plate support 30 Drive mechanism

Claims (18)

An exhaust gas cooling tower that cools exhaust gas containing dust,
A cooling tower body having a bottom surface provided with a discharge port for discharging dust and an inner wall surface rising upward from the bottom surface;
A dust scraper having a scraper mounting frame attached to the bottom surface and rotating around a vertical axis; a scraper which is a member attached to the scraper mounting frame; and a drive mechanism for rotating the scraper mounting frame;
With
The scraper is attached to the scraper mounting frame and is a scraper frame that is a longitudinal member whose longitudinal direction is parallel to the horizontal direction, and a plurality of plates that are supported by the scraper frame and sweep the dust accumulated on the bottom surface with a downward facing edge. With slats,
An exhaust gas cooling tower characterized by that. The plurality of blades are arranged with a predetermined angle in the direction in which the scraper frame moves and a predetermined interval in the longitudinal direction of the scraper frame.
The exhaust gas cooling tower according to claim 1. Each of the blades sweeps a floor area that is a belt-like area of the floor surface as the scraper mounting frame rotates.
The exhaust gas cooling tower according to claim 1, wherein the floor regions overlap each other and substantially cover the floor surface.   When a pitch circle centering on the vertical axis and imagining a pitch circle straddling the discharge port is assumed, each time the scraper mounting frame rotates, the blades sweep dust toward the arc of the pitch circle. The exhaust gas cooling tower according to any one of claims 1 to 3.   The exhaust gas cooling tower according to any one of claims 1 to 4, wherein an edge facing the lower side of the blade plate is formed by a series of a concave portion and a convex portion. The scraper is supported by the scraper frame and has a claw claw that is a plate that scratches the dust adhering to the inner wall surface with an edge facing the inner wall surface,
The exhaust gas cooling tower according to any one of claims 1 to 5, wherein the exhaust gas cooling tower is provided. The scraper is supported by the scraper frame and has a plurality of scratching claws which are plates that scratch the dust attached to the inner wall surface with an edge facing the inner wall surface,
A plurality of said claw nails are arranged at predetermined intervals above and below,
The exhaust gas cooling tower according to any one of claims 1 to 5, wherein the exhaust gas cooling tower is provided. The scratching nails face up and down,
The exhaust gas cooling tower according to any one of claims 6 and 7, wherein the exhaust gas cooling tower is provided. Each of the scratching claws scratches the inner wall region, which is a band-like region of the inner wall surface, as the scraper mounting frame rotates.
The exhaust gas cooling tower according to any one of claims 6 to 8, wherein the inner wall regions do not overlap each other. A dust scraper that scrapes dust accumulated in an exhaust gas treatment tower having a bottom surface provided with a discharge port for discharging dust and an inner wall surface rising upward from the bottom surface to the discharge port,
A scraper mounting frame attached to the bottom surface and rotating about a vertical axis;
A scraper which is a member attached to the scraper mounting frame;
A drive mechanism for rotating the scraper mounting frame;
With
The scraper is attached to the scraper mounting frame and is a scraper frame that is a longitudinal member whose longitudinal direction is parallel to the horizontal direction, and a plurality of plates that are supported by the scraper frame and sweep the dust accumulated on the bottom surface with a downward facing edge. With slats,
A dust collector characterized by that. The plurality of blades are arranged with a predetermined angle in the direction in which the scraper frame moves and a predetermined interval in the longitudinal direction of the scraper frame.
The dust scraper according to claim 10. Each of the blades sweeps a floor area that is a belt-like area of the floor surface as the scraper mounting frame rotates.
12. The dust scraper according to claim 10, wherein the floor regions overlap each other and substantially cover the floor surface.   When a pitch circle centering on the vertical axis and imagining a pitch circle straddling the discharge port is assumed, each time the scraper mounting frame rotates, the blades sweep dust toward the arc of the pitch circle. The dust scraper according to claim 10 to 12.   The dust scraper according to any one of claims 10 to 13, wherein an edge facing the lower side of the vane plate is formed by a series of concave and convex portions. The scraper is supported by the scraper frame and has a scratching claw that is a plate that scratches dust adhering to the inner wall surface with an edge facing the inner wall surface;
The dust scraper according to any one of claims 10 to 14, characterized by the above. The scraper is supported by the scraper frame and has a plurality of scratching claws which are plates that scratch the dust attached to the inner wall surface with an edge facing the inner wall surface,
A plurality of said claw nails are arranged at predetermined intervals above and below,
The dust scraper according to any one of claims 10 to 14, characterized by the above. The scratching nails face up and down,
The dust scraper according to any one of claims 15 and 16, characterized in that: Each of the scratching claws scratches the inner wall region, which is a band-like region of the inner wall surface, as the scraper mounting frame rotates.
18. The dust scraper according to claim 15, wherein the inner wall regions do not overlap each other.

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