JP7391262B1 - ash extrusion equipment - Google Patents

Abstract

[Problem] To promote the discharge of incinerated ash in a drive chamber and automatically clean a water level gauge to enable appropriate and accurate water level measurement. [Solution] The cooling tank 2 includes an incineration ash inlet 6 and an outlet 7, a scraper 4 that pushes out the incineration ash in the cooling tank 2, and a drive device 5 that drives the scraper 4. is stored at a predetermined water level, and the drive device 5 moves the scraper 4 reciprocatingly along the bottom plate 8. The water injection pipe 11 has a wide-angle nozzle 11a at its tip, and when the water level gauge 10 detects a drop in the stored water, the wide-angle nozzle directs the water to the cooling tank 2. Most of the injected water falls behind the rearmost position of the scraper, and the water level gauge 10 is washed with at least a portion of the water that falls ahead of the rearmost position of the scraper. [Selection diagram] Figure 1

Description

The present invention relates to an ash extrusion device that cools and discharges incinerated ash.

2. Description of the Related Art Incinerator plants are conventionally known as plants that incinerate materials to be incinerated such as garbage. In the incinerator (for example, stoker furnace) in this plant, ash (incinerated ash) generated by burning the material to be incinerated is dropped from an ash chute connected to the incinerator to the inlet of the ash extrusion device, After being cooled by the water stored in the cooling tank of the ash extrusion device, it is discharged from the ash extrusion device to a conveying device. The ash extrusion device is provided with a scraper (also called a "pusher") that pushes out the incinerated ash cooled by stored water to the discharge port. The scraper moves back and forth in a forward direction toward the discharge port and in a backward direction opposite to this by a drive device disposed in the drive chamber to push out the incinerated ash in the stored water toward the discharge port.
Further, in the ash extrusion device, a water level gauge for measuring the level of stored water and a water injection pipe for injecting water to store water at a predetermined water level in the cooling tank are arranged in the drive chamber.

There are various possible positional relationships between the water level gauge installed in the ash extrusion device and the water injection pipe. For example, in the drive chamber, a water level gauge and a water injection pipe are placed on the backward movement side of the scraper (hereinafter referred to as the "scraper rearmost position") than the position of the scraper's rear end when the scraper is in the most backward state (hereinafter referred to as the "scraper rearmost position"). There is an ash extrusion device in which the ash extrusion device is disposed on the reverse side of the end position (referred to as "rearward arrangement") (see Patent Document 1). In addition, in the drive chamber, the water level gauge and water injection pipe are arranged on the forward direction side of the scraper relative to the scraper rear end position (hereinafter, the case where they are arranged on the forward direction side than the scraper rear end position is referred to as "front arrangement"). There is an ash extrusion device (see Patent Document 2).

Note that Patent Document 1 and Patent Document 2 disclose patent technologies acquired by the inventor of the present invention. A part of the incinerated ash introduced into the inlet enters the drive chamber through the gap created between the inlet and the scraper during the forward and backward reciprocating motions of the scraper, and enters the drive chamber between the back of the scraper and the bottom plate of the drive chamber. Incineration ash (hereinafter referred to as "return ash") may accumulate in between. The patented technology is a technology in which gas is ejected between the bottom plate and the back side of the scraper in order to suppress the accumulation of returned ash.

Patent No. 6718563 Patent No. 6752988

As a result of research to further develop the patented technology disclosed in Patent Document 1 and Patent Document 2, the inventor of the present invention found that "returned ash" is better when the water injection pipe is placed at the rear than when it is placed at the front. It was found that this contributed to the decrease.
The reason for this is as follows. If the water injection pipe is placed in the "forward position", the water injected by the water injection pipe will push the incinerated ash that has entered the drive chamber and the "return ash" rolled up by the reciprocating movement of the scraper back into the reverse direction. Therefore, it is difficult to discharge these incinerated ash from the drive chamber toward the inlet. However, in the case of the "rear placement", the water injected by the water injection pipe pushes out the incinerated ash that once entered the drive chamber and the "returned ash" that has been rolled up, so these incinerated ash are It is thought that it is easier to discharge from the drive chamber toward the inlet.

On the other hand, it is desirable that the water level gauge be "forward-located" in order to accurately detect the water level. The reason for this is that when the scraper is moved back the most, a part of the scraper's upper plate may come out above the water surface of the stored water and temporarily block the stored water on the reverse side of that part. This is because there is a possibility that the water level measured by the water level gauge placed "at the rear" is significantly different from the water level in the forward direction side of the part, that is, in the majority of the cooling tank 2.

Here, the water injection pipe is generally formed of a straight pipe that is long in the vertical direction, and water injected from the water injection pipe is discharged directly below the water injection pipe. Therefore, when a water level gauge is installed near the water injection pipe, the water injected from the water injection pipe hits the water level gauge and automatically cleans the water level gauge (hereinafter referred to as "automatic cleaning" of the water level gauge).
However, for the reasons mentioned above, when manufacturing an ash extrusion device in which the water injection pipe is placed at the rear and the water level gauge is placed at the front, it is not possible to place the water level gauge directly below the water injection pipe, so the automatic Difficult to clean.
In order to enable automatic cleaning of the water level gauge, if a branch pipe branched from the water injection pipe is placed directly above the water level gauge, when water is injected from the water injection pipe, water is also injected from the branch pipe at the same time. Automatic cleaning becomes possible. However, due to the arrangement of devices and piping installed around the ash extrusion device, it is not always possible to arrange the branch pipe directly above the water level gauge. Moreover, in the first place, it is not desirable to newly install the branch pipe because it increases the manufacturing cost.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an ash extrusion device that has a simple configuration, promotes the discharge of incinerated ash in the drive chamber, automatically cleans the water level gauge, and enables appropriate and accurate water level measurement. do.

The ash extrusion device of the present invention includes a cooling tank provided with an inlet made of a cylindrical wall surface into which incinerated ash is introduced and an outlet for discharging the incinerated ash cooled by stored water, and a cooling tank disposed within the cooling tank. a scraper whose tip is in contact with the entire width of the bottom plate of the cooling tank and which pushes out the incinerated ash toward the discharge port; the bottom plate of the cooling tank has a first slope that slopes upward from directly below the inlet toward an open end where the discharge port is formed, and the first slope and a second inclined surface that is the same width as the inlet and slopes upward from directly below the inlet toward the opposite side of the first inclined surface, and the stored water is placed in the cooling tank at the lower end of the wall surface. The water is stored at a predetermined level that is above the discharge port and below the discharge port, and the drive device includes a drive shaft disposed above the second inclined surface, and the drive shaft rotates to drive the water. The ash extrusion device reciprocates the scraper forward and backward along the bottom plate by an arm connected to a shaft and the scraper.
The ash extrusion device of the present invention further includes a water injection pipe disposed in the driving chamber rearward in the backward movement direction from a scraper rearmost end position, which is the rearmost position of the scraper when the scraper is in the most backward movement state. , in the drive chamber, at least a lower end of the rod-shaped sensor portion has a water level gauge disposed forward in the forward movement direction from the rearmost end position of the scraper, and the water injection pipe has a wide-angle nozzle at its tip. , when the water level meter detects that the stored water is below the predetermined water level, water is injected into the cooling tank by wide-angle injection from the wide-angle nozzle, and the majority of the injected water is The water level gauge is washed by at least a portion of the water that falls in the backward direction from the scraper rearmost position and falls in the forward movement direction from the scraper rearmost position, of the sprayed water. .

According to the ash extrusion device of the present invention, the water injection pipe is arranged behind the scraper rearmost position, and the majority of the water injected from the wide-angle nozzle at the tip of the water injection pipe is directed to the scraper than the scraper rearmost position. Since it is dropped in the backward direction, the water flow of the majority of water pushes out the incinerated ash and returned ash that have entered the drive chamber in the forward direction of the scraper, and discharges these incinerated ash from the drive chamber toward the inlet. be able to. Further, since at least the lower end of the rod-shaped sensor portion of the water level gauge is disposed forward, the water level can be appropriately detected.
When water is injected into the cooling tank from the water injection pipe, the water level gauge can be automatically cleaned by at least a portion of the water injected from the wide-angle nozzle. Therefore, malfunction of the water level gauge can be prevented and the water level can be detected permanently and accurately by the water level gauge.
As described above, with a simple configuration, it is possible to provide an ash extrusion device that promotes the discharge of incinerated ash in the drive chamber, automatically cleans the water level gauge, and enables appropriate and accurate detection of the water level.

It is a sectional view of the ash extrusion device concerning an embodiment. FIG. 2 is a partially enlarged schematic diagram of the vicinity of the water level gauge and water injection pipe in FIG. 1; This is a modification of the installation state of the water level gauge shown in FIG. 2.

Hereinafter, an ash extrusion device that is an embodiment of the present invention will be described. In each figure used for explanation, an orthogonal coordinate system including an X-axis, a Y-axis, and a Z-axis is used as appropriate to simplify the explanation.
The ash extrusion device of the embodiment is merely an example, and there is no intention to exclude the application of various modifications and techniques not specified. Except for the configurations essential to the present invention, the configurations of the embodiments can be selected or modified in various ways as necessary.
In addition, in the following description, an ash extrusion device using the gas piping of Patent Documents 1 and 2 by the present inventor will be explained, but the present invention also applies to an ash extrusion device that does not use the technology of Patent Documents 1 and 2. Applicable.

First, the overall configuration of an ash extrusion device 1 according to an embodiment will be described using FIG. 1. However, the water level gauge 10 will be described in detail later using FIGS. 2 and 3.
The ash extrusion device 1 includes a cooling tank 2 in which stored water for cooling incinerated ash is stored at a predetermined water level (broken line in FIG. 1), and a scraper 4 and a drive device 5 arranged in the cooling tank 2. The cooling tank 2 is provided with an inlet 6 through which incinerated ash is introduced and an outlet 7 through which the cooled incinerated ash is discharged.
The stored water and the liquid used for injection by the wide-angle nozzle 11a of the water injection pipe 11, which will be described later, may be water as long as its main component is tap water, industrial water, or recycled water (used in the plant). It may be water that has been treated later, or it may be mixed water that has been neutralized by mixing with hydrochloric acid or the like. Hereinafter, these liquids used for the stored water will be simply referred to as "water".

The inlet 6 of the cooling tank 2 is formed by a wall surface 9 having a cylindrical shape (for example, a rectangular cylindrical shape). This cylindrical wall surface 9 is directly connected to an ash chute (not shown). Note that the upper end of the ash chute is connected to an incinerator (for example, a post-combustion stage of a stoker furnace), which is not shown.
In order to have a so-called "water seal" configuration, the lower end of the wall surface 9 is located below a predetermined water level of the water stored in the cooling tank 2 .

The scraper 4 is a device that pushes out the cooled incineration ash toward the discharge port 7 side. The scraper 4 includes an upper plate 4a facing upward, an extrusion plate 4b facing the discharge port 7, and both side plates connected to the upper plate 4a and the extrusion plate 4b. (One side plate 4c is shown). Since the lower surface corresponding to the upper plate 4a is not arranged, the scraper 4 has a box-like shape open to the bottom plate 8 side of the cooling tank 2.
The scraper 4 is connected to an arm 5b, which will be described later, and moves forward and backward along the bottom plate 8 of the cooling tank 2 while the lower end of the extrusion plate 4b (i.e., the tip 4d of the scraper 4) is in contact with the entire width of the bottom plate 8. . Note that the rear end 4e of the scraper 4 is the end of the upper plate 4a closest to the +X axis, and is a portion that serves as an index of the "rear end position of the scraper." Here, the "rear end position of the scraper" (dotted chain line in the vertical direction in FIG. 1) is the position of the rear end 4e of the upper plate 4a of the scraper 4 when the scraper 4 is in the most backward state.
Note that "forward" of the scraper 4 means that the scraper 4 moves in a direction (-X axis direction, forward direction Df in FIG. 1) that pushes out the incinerated ash toward the discharge port 7 side. Moreover, "reverse movement" of the scraper 4 means that the scraper 4 moves in the opposite direction of "forward movement" (+X-axis direction, backward movement direction Dr in FIG. 1). Furthermore, the "total width" of the bottom plate 8 of the cooling tank 2 means the dimension in the width direction of the inside of the cooling tank 2 (the direction perpendicular to the paper surface of FIG. 1, that is, the Y-axis direction).

The drive device 5 is a device that drives the scraper 4 , and is arranged in a drive chamber 12 located on the opposite side of the discharge port 7 from the inlet port 6 . The drive chamber 12 is partitioned from the outside by a wall surface furthest in the +X-axis direction among the side walls of the inlet 6, a second inclined surface 8b extending in the +X-axis direction from the wall surface, and a ceiling plate 12a. .
The drive device 5 includes a drive shaft 5a that can rotate in two directions, and an arm 5b that connects the scraper 4 and the drive shaft 5a. The drive device 5 drives the arm 5b by rotating the drive shaft 5a, and as a result causes the scraper 4 connected to the arm 5b to reciprocate forward and backward. The drive device 5, excluding the arm 5b, is arranged above a second inclined surface 8b, which will be described later, at a position where it is not immersed in the stored water (above the "predetermined water level").

The bottom plate 8 of the cooling tank 2 has a first slope that slopes upward from directly below the inlet 6 toward the outlet 7 (specifically, the vertically lower end (open end) of the outlet 7). It includes a surface 8a and a second slope 8b that slopes upward from directly below the inlet 6 toward the opposite side of the first slope 8a.
That is, the first inclined surface 8a is formed to become gradually higher in the forward direction Df. Further, the second inclined surface 8b is formed so as to become gradually higher toward the reverse direction Dr.
In the cooling tank 2, the bottom plate portion directly below the inlet 6 is the lowest, and the bottom plate 8 has a downwardly convex curved surface. The cross-sectional shape of the cooling tank 2 is uniform in the width direction, and each width dimension of the first inclined surface 8a and the second inclined surface 8b (the dimension in the direction perpendicular to the plane of the paper in FIG. 1, that is, the dimension in the Y-axis direction) are all the same.

The ash extrusion device 1 has a water injection pipe 11 "rearly placed" that increases the water stored in the cooling tank 2 based on the water level detected by a water level gauge 10, which will be described in detail later with reference to FIG. 2 or 3. Be prepared. "Rearward arrangement" refers to arrangement on the backward side of the "scraper rearmost position" (dotted chain line in FIG. 1), that is, on the +X-axis direction side of the "scraper rearmost position". Note that at least a part of the rod-shaped sensor section of the water level gauge 10, which will be described later, is "disposed at the front", specifically, the lower end of the sensor section, but "front arrangement" means "the scraper rearmost position" (see Figure 1) on the forward direction side, that is, on the -X-axis direction side of the "scraper rear end position".
The water injection pipe 11 is disposed rearwardly through a ceiling plate 12a disposed above the second inclined surface 8b and above the drive device 5, and is fixed to the ceiling plate 12a.
The water injection pipe 11 is connected to a water source (not shown), such as a water storage tank, and has a wide-angle nozzle 11a at its tip. The wide-angle nozzle 11a is a nozzle, such as a full conical nozzle, an empty conical nozzle, or a fan-shaped nozzle, in which the spray pattern spreads over a wide range as it moves away from the injection port.

The amount of water stored in the cooling tank 2 is adjusted by the control device 13 and the drain pipe 14 so that it is maintained at a "predetermined water level."
The drain pipe 14 is a pipe that drains the stored water when the water level of the stored water exceeds a predetermined water level. The opening at the upper end of the drain pipe 14 is arranged above and near a predetermined water level. As a result, excess stored water is automatically overflowed and discharged from the drain pipe 14 without any valve control.

Then, the control device 13 controls the water injection pipe based on measurement data (detection results) regarding the water level (for example, the actual water level that is the actual water level of the stored water stored in the cooling tank 2) received from the water level gauge 10, which will be described later. The opening and closing of a solenoid valve 15 interposed in the middle of the valve 11 is controlled. That is, when the measurement data (detection result) received from the water level meter 10 indicates that the water level of the stored water is lower than the predetermined water level, the control device 13 opens the electromagnetic valve 15 to open the wide-angle nozzle 11a of the water injection pipe 11. Water is injected into the inside of the cooling tank 2.
At this time, the design is such that the majority of the water that is injected, for example, more than 50% and less than 80% of the total amount of water, falls in the backward direction from the rearmost position of the scraper, and at least part of the remaining water The scraper is designed to fall in the forward direction from the rear end position of the scraper after it hits a rod-shaped sensor part of a water level gauge 10, which will be described later. The water flow when the majority of the water falls in the backward direction from the rear end position of the scraper pushes out the incinerated ash and returned ash that have entered the drive chamber in the forward direction of the scraper 4, and moves these incinerated ash back into the drive chamber. It can be discharged from 12 toward the inlet 6.
Then, when the measured data indicates a level of the stored water equal to or higher than a predetermined level, the control device 13 closes the electromagnetic valve 15 to stop water injection into the cooling tank 2 .

As mentioned earlier, the ash extrusion device 1 shown in FIG. Since the ash extrusion device 1 uses a gas pipe 17 to suppress the accumulation of ash, this point will also be briefly explained. Although the present invention can be applied to an ash extrusion device that does not apply the technology of Patent Document 1 or Patent Document 2, even better effects can be obtained if the technology of Patent Document 1 or Patent Document 2 is also used, so this will be described as an example. It is something.

The gas pipe 17 is arranged above the second inclined surface 8b in the +X-axis direction from the scraper rear end position, that is, at a position where it does not come into contact with the reciprocating scraper 4 and arm 5b. The gas pipe 17 is arranged linearly in the vertical direction (Z-axis direction) from one end 17a (lower end) to the other end 17b (upper end) of the gas pipe 17.
In the gas pipe 17, the shape of one end 17a disposed below the predetermined water level is substantially L-shaped with a corner bent in the horizontal direction, and this corner is connected to the second inclined surface 8b. placed in contact with. One end 17a is provided with a gas outlet 17c that opens substantially in the horizontal direction (-X-axis direction).
A compressor 17d is provided at the other end 17b located above the ceiling plate 12a. The gas ejected from the gas ejection port 17c of the gas pipe 17 is, for example, compressed air compressed by the compressor 17d.
A gas electromagnetic valve 17e is installed in the gas pipe 17, and when the control device 13 opens the gas electromagnetic valve 17e at a predetermined timing, gas is ejected from the gas outlet 17c.

The water flow and bubbles generated by the gas ejected from the gas outlet 17c in the vicinity of the second inclined surface 8b proceed in the forward direction Df (-X axis direction) between the second inclined surface 8b and the scraper 4, and eventually the scraper By gently hitting the back side of the extrusion plate 4b or the top plate 4a of No. 4 at a slow speed, it rebounds or swirls without hitting. Therefore, the return ash accumulated in the space 16 above the second inclined surface 8b (for example, on the second inclined surface 8b or the space on the back side of the scraper 4) of the cooling tank 2 is peeled off by the bubbles caused by the gas. The water flow stirs not only the peeled return ash but also the return ash that is about to accumulate in the space 16.
Then, the returned ash is pushed up to the water surface from the back side of the scraper 4 and near the second inclined surface 8b and dispersed due to the buoyancy of the bubbles. That is, a water flow is generated that is pushed up to the water surface from the back side of the scraper 4 and from the vicinity of the second inclined surface 8b.

Therefore, when the control device 13 executes control for injecting water from the wide-angle nozzle 11a of the water injection pipe 11, if it also executes control for ejecting gas from the gas outlet 17c, compared to a case where the gas is not ejected, The water flow generated by water injection toward the inlet 6 side and the rising water flow generated by the gas in the rear region and directed toward the inlet side are combined, and the wall surface in the + The incinerated ash can be more smoothly discharged from the above-mentioned gap created between the ash and the incineration port 6 to the inlet 6 side.

Now, the water level gauge 10 will be explained in detail using FIG. 2. FIG. 2 is an enlarged schematic diagram of the vicinity of the water level gauge 10 and water injection pipe 11 shown in FIG. Since FIG. 2 is a schematic diagram, not all of the configurations in the vicinity shown in FIG. 1 are necessarily shown in FIG. 2.
The water level gauge 10 includes at least a base portion 10e and a rod-shaped sensor portion. A circuit for generating the above-mentioned measurement data (detection results) and the like are stored in the base 10e.
Here, as shown in FIG. 2, the water level gauge 10 includes a plurality of rod-shaped sensors as a rod-shaped sensor section, for example, four rod-shaped electrodes 10a to 10d (a plurality of electrodes) are arranged as sensors. Give an example.

A flanged inclined pipe 19 is fixed to the ceiling plate 12a of the drive chamber 12 and arranged rearward near the rearmost position of the scraper. The flanged inclined pipe 19 is inclined from about 30° to about 60° from the Z axis (vertical direction) to the +X axis direction (reverse direction Dr).
A flange provided on the base portion 10e and a flange provided on the flanged inclined pipe 19 are fixed with bolts and nuts via a gasket or an O-ring. The upper end of each electrode 10a to 10d, which is a rod-shaped sensor of the water level gauge 10, is inserted into a through hole formed in the ceiling plate 12a and attached to the base 10e.
Since the flanged inclined tube 19 is inclined as described above, the lower ends of the electrodes 10a to 10d, which are rod-shaped sensors, can be placed forward while the base portion 10e is placed at the rear. That is, the rod-shaped electrodes 10a to 10d are arranged obliquely, with their upper ends disposed at the rear and their lower ends disposed at the front.

As mentioned above, when the scraper 4 is moved back the most, the rear end of the upper plate 4a of the scraper 4 comes out above the water surface of the stored water and temporarily dams up the stored water on the reverse side of the rear end. There is a possibility that it will be stored away. However, since the lower end of each of the electrodes 10a to 10d is located forward, the water level measured by the water level gauge 10 is the same as the water level in most of the cooling tank 2. That is, it becomes possible to measure the water level appropriately using the water level gauge 10.
Moreover, since both the base 10e of the water level gauge 10 and the water injection pipe 11 are arranged at the rear, they are arranged near the walkway. Therefore, it is also excellent in that maintenance is easy for operators.

Furthermore, as described above, when water is injected from the wide-angle nozzle 11a of the water injection pipe 11, the majority of the injected water falls in the backward direction from the rearmost position of the scraper, and at least part of the remaining water A wide-angle nozzle 11a is arranged so as to hit each of the diagonally arranged electrodes 10a to 10d. Therefore, it is desirable that the wide-angle nozzle 11a be arranged at an angle from the water injection pipe 11.
In this way, each of the electrodes 10a to 10d, which are the rod-shaped sensor portions of the water level gauge 10, are automatically cleaned with water sprayed from the wide-angle nozzle 11a when water is injected through the water injection pipe 11. Therefore, the automatic cleaning prevents the water level gauge 10 from malfunctioning while the ash extrusion device 1 is in operation, and allows the water level gauge 10 to accurately measure or detect the water level.
In FIG. 2, the wide-angle nozzle 11a is arranged so that the injection direction is diagonally downward in the -X axis direction (advance direction Df) with respect to the water injection pipe 11 arranged in the vertical direction. The water hitting each of the electrodes 10a to 10d flows downward through each electrode, cleansing the bottom ends of those electrodes, and falls into the stored water in the -X axis direction (advance direction Df) from the scraper rearmost position.

The electrically insulating separator 18 has openings corresponding to the thickness and position on the XZ plane of each of the electrodes 10a to 10d. Then, by inserting each electrode 10a to 10d into each opening of the insulating separator 18, the electrodes 10a to 10d are prevented from coming into contact with each other. The separator 18 is placed above the separator 18 to the extent that water sprayed from the wide-angle nozzle 11a of the water injection pipe 11 does not hit the separator 18.
Note that the electrodes 10a to 10d, which are fixed by the separator 18 so as not to come into contact with each other, are arranged at slightly different positions in the Y-axis direction so that their positions in the Y-axis direction do not overlap, so that the water sprayed by the wide-angle nozzle 11a can easily hit the electrodes. will be placed.
Although not shown, in order to prevent the rod-shaped electrodes 10a to 10d, which are arranged obliquely, from bending, the separators are connected to each other by, for example, an L-shaped insulating support member whose one end is fixed to the ceiling plate 12a. It is preferable to support these electrodes above 18.

Among the electrodes 10a to 10d, the first electrode 10a, the second electrode 10b, and the third electrode 10c are sensing electrodes. The lower end of the first electrode 10a is placed at a predetermined water level. The second electrode 10b has its lower end placed at a height below the predetermined water level. The third electrode 10c has its lower end placed at a height above the predetermined water level. The lower end of the common electrode 10d is arranged below the lower end of the second electrode 10b.
The water (reserved water) stored in the cooling tank 2 of the ash extrusion device 1 is a conductor. Therefore, in the water level meter 10, when the common electrode 10d does not conduct electricity to any of the first electrode 10a, the second electrode 10b, and the third electrode 10c, the water level of the stored water is lower than the lower end of the second electrode 10b. It is determined that there is, and measurement data (detection results) is generated.
When the common electrode 10d conducts electricity only with the second electrode 10b, the water level meter 10 determines that the water level of the stored water is equal to or higher than the lower end of the second electrode 10b and lower than the lower end of the first electrode 10a, and transmits the measured data. generate.
In the water level gauge 10, when the common electrode 10d is energized only with the second electrode 10b and the first electrode 10a, the water level of the stored water is equal to or higher than the lower end (predetermined water level) of the first electrode 10a and the third electrode 10c. It is determined that the value is less than the lower limit of , and measurement data is generated.
The water level gauge 10 determines that the water level of the stored water is equal to or higher than the lower end of the third electrode 10c when the common electrode 10d conducts electricity with all of the second electrode 10b, the first electrode 10a, and the third electrode 10c, Generate measurement data.

Here, an example is given in which four electrodes are provided as the plurality of rod-shaped sensors, but depending on the design, the number of sensors may be three or less or five or more.
In addition, if, for example, a detection method using capacitance or a detection method based on reflection of a pulse wave is adopted instead of the detection method based on energization between the common electrode and the detection electrode, the difference is that only a single rod-shaped sensor is used. It is also possible to configure a water level gauge 10 that can measure the water level. That is, the water level gauge 10 may have a plurality of rod-shaped sensors or a single rod-shaped sensor.

By the way, as described above, when the scraper 4 is moved back the most, the rear end 4e of the upper plate 4a of the scraper 4 and a part of its vicinity may come out above the water surface of the stored water. Each of the electrodes 10a to 10d of the water level gauge 10, which is arranged obliquely in FIG. must be precisely designed to avoid contact with
Therefore, as shown in FIG. 3, the entire water level gauge 10 is placed in the vicinity of the scraper rear end position, for example, at a distance of approximately 10 cm to 50 cm in front of the scraper rear end position in the -X axis direction (advance direction Df). It also avoids elaborate designs, which can be expensive.

FIG. 3 shows a modification of the installation state of the water level gauge 10 shown in FIG. 2. 3 differs from the configuration shown in FIG. 2 only in that there is no flanged inclined pipe 19, the entire water level gauge 10 is placed forward near the rearmost position of the scraper, and is fixed in the vertical direction. are the same. Therefore, a description of the same configuration will be omitted.
In the water level gauge 10 of FIG. 3, a flange provided on the base 10e is fixed to the ceiling plate 12a with bolts and nuts. Therefore, each rod-shaped electrode 10a to 10d, which is a rod-shaped sensor portion, is arranged so that its length direction is in the vertical direction.
Even with this configuration, when water is injected from the wide-angle nozzle 11a of the water injection pipe 11, the majority of the injected water falls in the backward direction from the scraper rear end position, and at least part of the remaining water is By applying it to each of the electrodes 10a to 10d arranged in front, these electrodes can be automatically cleaned.

As described above, the ash extrusion device 1 has the simple configuration shown in FIGS. 1 to 3, promotes the discharge of incinerated ash in the drive chamber 12, automatically cleans the water level gauge 10, and measures the water level appropriately and accurately. enable.
In the ash extrusion device 1, it is desirable that the water injection pipe 11 be placed as far back as possible, but it may be adjusted in the X-axis direction as appropriate depending on the injection pressure and injection angle of the wide-angle nozzle 11a, as long as it does not go against the spirit of the present invention. It is possible. Furthermore, it is desirable that the lower end of the rod-shaped sensor section of the water level gauge 10, which is disposed forward, be disposed as close to the scraper rear end position as possible; It can be adjusted in the X-axis direction as appropriate depending on the injection pressure and injection angle.

1 Ash extrusion device 2 Cooling tank 3 Conveying device 4 Scraper 4a Top plate 4b Extrusion plate 4c Side plate 4d Tip 4e Rear end 5 Drive device 5a Drive shaft 5b Arm 6 Inlet 7 Discharge port 8 Bottom plate 8a First slope 8b Second slope Surface 9 Wall surface 10 Water level gauge 10a to 10d Rod-shaped sensor part (detection electrode, common electrode)
10e Base 11 Water injection pipe 11a Wide-angle nozzle 12 Drive chamber 12a Ceiling plate 13 Control device 14 Drain pipe 15 Solenoid valve 16 Space 17 Gas piping 17a One end of gas piping 17b Other end of gas piping 17c Gas outlet 17d Compressor 17e Gas solenoid valve 18 Separator 19 Flanged inclined pipe Df Forward direction Dr Reverse direction

Claims (5)

a cooling tank equipped with an inlet made of a cylindrical wall into which incinerated ash is introduced and an outlet which discharges the incinerated ash cooled by stored water;
a scraper disposed within the cooling tank, the tip of which contacts the entire width of the bottom plate of the cooling tank and pushes out the incinerated ash toward the discharge port;
a drive device that is disposed in a drive chamber on the opposite side of the discharge port with respect to the introduction port and drives the scraper;
The bottom plate of the cooling tank has a first inclined surface that slopes upward from directly below the inlet toward an open end where the discharge port is formed, and a first inclined surface that is the same width as the first inclined surface and that is connected to the inlet. and a second inclined surface that slopes upward from directly below the first inclined surface toward the opposite side of the first inclined surface,
The stored water is stored in the cooling tank at a predetermined water level above the lower end of the wall surface and below the discharge port,
The drive device includes a drive shaft disposed above the second inclined surface, and when the drive shaft rotates, an arm connected to the drive shaft and the scraper moves the scraper along the bottom plate. An ash extrusion device that moves forward and backward reciprocally,
In the drive chamber, a water injection pipe arranged rearward in the backward movement direction from a scraper rearmost end position that is the rearmost position of the scraper when the scraper is in the most backward movement state;
In the drive chamber, at least a lower end of the rod-shaped sensor portion has a water level gauge disposed ahead of the scraper rearmost end position in the forward movement direction;
The water injection pipe has a wide-angle nozzle at its tip,
When the water level gauge detects that the stored water is below the predetermined water level, water is injected into the cooling tank by jetting water at a wide angle from the wide-angle nozzle,
A majority of the jetted water falls in the backward direction from the scraper rearmost position, and at least a portion of the jetted water falls in the forward movement direction from the scraper rearmost position. an ash extrusion device in which the water level gauge is cleaned by; The water injection pipe and the water level gauge are arranged to penetrate a ceiling plate arranged above the second slope and above the drive device,
The ash extrusion device according to claim 1, wherein the water level gauge is arranged such that an upper side thereof is arranged at the rear side and a lower side thereof is arranged at the front side, and the water level gauge is arranged at an angle as a whole. The water injection pipe and the water level gauge are arranged to penetrate a ceiling plate arranged above the second slope and above the drive device,
The ash extrusion device according to claim 1, wherein the water level gauge is entirely disposed at the front. The sensor section is
A rod-shaped common electrode,
a rod-shaped first electrode that detects that the stored water is at the predetermined water level;
a rod-shaped second electrode that detects that the stored water is below the predetermined water level;
a rod-shaped third electrode that detects that the stored water is above the predetermined water level;
The ash extrusion device according to claim 2 or 3, further comprising a separator that prevents the respective electrodes from coming into contact with each other. further comprising a gas pipe whose one end to the other end is disposed above the second inclined surface at a position that does not contact the reciprocating scraper and the arm;
The one end of the gas pipe is disposed below the predetermined water level, and the gas pipe is configured to eject gas introduced from the other end into the one end between the second inclined surface and the scraper. Equipped with a spout,
The ash extrusion device according to claim 4, wherein return ash that is about to be deposited on the second slope side is stirred by a water flow of the stored water generated by the gas ejected from the gas outlet and bubbles caused by the gas. .

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