JP3328631B2 - Slurry submerged casting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention slurries fly ash (coal ash) generated from a coal-fired boiler such as a coal-fired power plant and transports the slurry to a predetermined landfill site by a slurry transport pipe. The present invention relates to an apparatus for placing underwater in a slurry transport pipe with a slurry transport pipe to be discarded, and a recovery apparatus for a cleaning pig for cleaning the inner surface of the slurry transport pipe.

[0002]

2. Description of the Related Art At present, coal ash generated from coal-fired boilers such as coal-fired power plants in Japan is an enormous amount of about 7.3 million tons (ton) / year. Approximately 5 million tons are effectively used as raw materials for cement.
300,000 tons are disposed of as landfill at landfill sites.
Conventionally, among coal ash, especially coal ash discharged from a boiler is discarded to a landfill site by using about 20 coal ash.
% And humidified with water to make it in a dry state, transported to a predetermined landfill site by a dump truck or a belt conveyor, and then dumped. In this case, the discarded coal ash becomes bulky. When the coal ash reaches a certain height, the coal ash is compacted by a bulltozer or the like, and is laid as landfill on the disposal site.
As another method, about 50% seawater is mixed with coal ash,
There is also a method in which the slurry is formed by kneading with a mixer, transported to a predetermined landfill site using a pipe or a hose, and discarded. When the quay has a slope (the surface where the quay has a relatively gentle slope) when dumping to a landfill in this way, use a pipe or hose from above the slope as shown in FIG. If the slope is not on the quay, the pipe or hose is plunged from the quay into the water at the landfill site and dumped near the water, as shown in FIG.

[0003]

However, in the former of the above prior arts, since the water content in the transportation of coal ash is as low as about 20%, the landfill density is 0.9 to 1 t / cubic meter. Therefore, there is a problem that the utilization rate of the dumping land area is poor and that a small amount of landfill cannot be used effectively. In the method using the slope of the quay, there is no problem because the slurry flows into the water along the slope, but if there is no slope, the slurry is released near the water surface, so the slurry was released. The slurry diffuses on the water surface or in the water, increasing the distance between the ash particles, thereby decreasing the landfill density and reducing the amount discarded per a certain area, resulting in poor utilization efficiency of the dump site. In the latter case of the prior art, slurry coal ash is transported by pipes or hoses, and its leading end is set near the water bottom from the quay (approximately 1 m above the water bottom in the practice) and released. Therefore, it does not diffuse in water and accumulates on the bottom as a fluid. Therefore, the landfill density is high, and the utilization efficiency of the dump site is good. However, as the slurry accumulates on the water floor, the tip end of the pipe or hose is immediately blocked by the slurry, and as a result, the slurry cannot be discharged smoothly. In such a case, the crane is carried to the site and the pipe or hose hanging underwater is moved horizontally and vertically or simultaneously in both directions by using the crane, but the working environment at the work site is not good. ,
In addition, there is a problem that the work efficiency is extremely poor because a large amount of time is required for the work preparation by the crane. In addition, since the slurry is transported to the landfill site by a pipe or a hose as described above, the slurry adheres to the inner wall surface of the pipe or the hose and causes clogging. It is necessary to clean the inside of the hose. For this purpose, an expensive pig such as sponge material is pushed into the pipe to perform the above-described washing. When the pig reaches the tip of the pipe or hose, the pig is discharged together with the slurry from the tip end and the water bottom. Sunk in the slurry and cannot be collected because it is buried in the deposited slurry, which is uneconomical.

SUMMARY OF THE INVENTION The present invention solves such a problem, and an object of the present invention is to make it possible to easily move the tip end of a slurry transport tube for transporting slurry, which discharges slurry, in a horizontal or vertical direction. Another object of the present invention is to make it possible to easily and easily recover a pig for cleaning the inner surface of a used slurry transport pipe before dropping into a water bottom or deposited slurry.

[0005]

The means taken to solve the above-mentioned problem is based on the premise of a slurry submerged casting apparatus for converting coal ash into a slurry with seawater or the like and transporting it to a predetermined landfill site by a slurry transport pipe. Is constituted by the following (a) to (e). (B) Connect a trough to the tip of the slurry transport pipe,
To attachment slurry discharge tube to the tip of the trough, (b) providing the turning device for horizontal pivoting on the support base, inclined tilting the trough in the vertical direction (c) the pivoting device
Providing the braking system, the troughs (d) the pivoting device and the tilting device supporting
It was lifting, the three-way valve to the slurry discharge pipe side of (e) above trough
Provided at the lower part of the three-way valve to collect the pig after washing.
A pig collection device equipped with a grid-like mesh body .

[0006]

The trough connected to the tip of the slurry transport pipe is supported by a horizontally rotating swivel device, so that when the swivel device is swiveled, the trough is swiveled horizontally and the tip of the slurry discharge pipe connected to the tip of the trough. Is moved in the horizontal direction near the bottom of the water. Therefore, even if the upper end of the slurry discharged and accumulated from the tip of the slurry discharge pipe reaches the vicinity of the tip of the slurry discharge pipe near the water bottom, the tip of the slurry discharge pipe is raised by the turning operation of the turning device. It can be easily and horizontally moved without changing its position, so that the tip port is not blocked and the slurry is almost uniformly dispersed over a wide area while avoiding splashing into water. Can be deposited at different heights.

In addition, the turning device is provided with a tilting device for tilting the trough in the vertical direction, and the trough is supported by the tilting device. The tip of the connected slurry discharge tube can be easily moved up and down easily. Therefore, even if the upper end of the slurry deposited on the water bottom reaches the tip end of the slurry discharge tube, the tip end can be easily moved upward (in the vertical direction), so that the tip end is blocked by the accumulated slurry. It is possible to deposit the slurry to a predetermined height while avoiding that the slurry is scattered in water.

From the above, when the pile height of the slurry discharged from the tip end of the slurry discharge pipe lowered to the vicinity of the water bottom reaches the tip end, the trough is swirled horizontally by the turning device. By moving the tip horizontally, the height of the tip end of the slurry discharge pipe can be adjusted by changing the vertical inclination angle of the trough by the tilting device, whereby the slurry is scattered in water. The slurry can be deposited over a wide range to a uniform predetermined height (a height of several meters) while avoiding the problem. And since such a slurry discharge operation is performed continuously without stopping the transportation of the slurry,
The operation of placing the slurry can be performed extremely efficiently.

Further, a three-way valve is provided on the side of the trough above the slurry discharge pipe, and by switching this three-way valve, the trough communicates with the slurry discharge pipe via the three-way valve or via the three-way valve. The trough can be released to the atmosphere. The pig is inserted into the slurry transport pipe, and the pig is advanced by the slurry fed under pressure, thereby removing the slurry attached to the inner surface of the slurry transport pipe and the inner surface of the trough. At this time, since the three-way valve has been switched to the open-to-atmosphere position, the pig is discharged from the three-way valve together with the slurry. Since the pig collecting device is provided below the three-way valve, the pig collecting device is always located below the three-way valve regardless of the position of the trough in the turning direction. Therefore, regardless of the position of the trough in the turning direction, the pig discharged from the three-way valve surely falls on the grid net of the pig collecting device and is captured and collected by the pig collecting device.

[0010]

An embodiment of the present invention will be described with reference to FIGS. Fig. 1 shows that coal ash collected from a coal-fired boiler is temporarily stored in a silo, and the coal ash extracted from the silo is mixed with seawater to form a slurry. 1 shows an outline of a slurry submerged casting device that is transported to the ground, dumped into the sea, and landfilled. The coal ash discharged from the coal-fired boiler is collected by a cyclone separator, an electric dust collector, or the like, and temporarily stored in the silo 1. The coal ash taken out of the silo 1 is supplied to an ash metering device 2 (in this embodiment, having a function of supplying 40 t / h). A constant amount (for example, 500 t) of ash is continuously supplied from the ash metering device 2 to the ash-water mixer 3.
And a predetermined amount (for example, about 20 t / h) of water is supplied to the ash water mixer 3 through the water supply pipe 4 by controlling the water from the water supply pump 5 with the water amount control valve 6. Water and the above coal ash are mixed to form a slurry. The slurry is pressure-fed to the slurry transport pipe 8 by the slurry pump 7, and the trough 11 connected to the tip of the slurry transport pipe 8,
Through the slurry discharge pipe 15 connected to the end of the water near the water bottom. The tip opening 9 of the slurry discharge pipe 15 is lowered to the vicinity of the water bottom at a predetermined position of the landfill, so that the slurry discharged from the tip opening 9 is immediately deposited on the water bottom, and the slurry is scattered into water. You are avoiding that.

The slurry discharged from the tip opening 9 of the slurry discharge pipe 15 to the water bottom gradually accumulates on the water bottom, and the apex of the volume of the slurry is changed to the tip port 9 of the slurry discharge pipe 15.
Is reached, the tip end port 9 is closed with the accumulated slurry, and further discharge cannot be performed. However, a trough (pipe) 11 is connected to the tip 9 of the slurry transport pipe 8,
The trough 11 is supported by a support mechanism that can be turned horizontally and tilted up and down, and the tip end of the slurry discharge pipe 15 is not blocked by turning the trough 11 horizontally and tilting it vertically. In addition, the slurry can be deposited to a predetermined height over a wide range while preventing the slurry from scattering into water.

Next, referring to FIG. 2 and FIG.
A support mechanism for supporting the device so as to be able to turn horizontally will be described. However, this is a basic part of the embodiment of the present invention, and is not an example itself. A cylindrical casing 20 is rotatably mounted on a pivot shaft 17 of a support base 19 that is appropriately moved via a bearing, and thereby the swivel base 12 is configured. The support plate 14 is fixed to the upper end of the casing 20, and the support plate 1
4 and the trough 11 is attached to the turntable 12.
It is supported so that it can turn horizontally. A three-way valve 16 is provided on the side of the slurry discharge pipe 15 of the trough 11, and a pig collecting device 21 disposed below the three-way valve is attached to the support plate 14. Since a relatively large load is applied to the front end of the support plate 14, a balance weight 13 is provided at the rear end of the support plate 14 to balance the load. When the housing 20 of the turntable 12 is turned, the trough is horizontally turned together with the support plate 14, and the tip of the slurry discharge pipe 15 connected to the tip is turned in the horizontal direction.

Next, with reference to FIG. 4, an embodiment of the present invention, that is, a support mechanism for supporting the trough 11 so as to be freely rotatable horizontally and tiltable in the vertical direction will be described. A hinge device 18 using a horizontal pin 18a is provided at an upper end of a casing 20 of the swivel table 12 shown in FIG.
8, the support plate 14 to which the trough 11 is attached is supported so as to be tiltable in the vertical direction. Further, an arm 23 protrudes laterally from the side surface of the casing 20, and a lower end of the angle adjusting plate 25 is fixed to a tip of the arm 23. The upper portion of the angle adjusting plate 25 has an arc shape centered on the horizontal pin 18a of the hinge device 18, and a large number of inclination angle adjusting holes 24 are provided in the arc shape portion. The connecting plate 24 a is connected to the angle adjusting plate 25 by inserting a connecting pin 24 a into the inclination angle adjusting hole 24 and the hole of the supporting plate 14. A screw jack 26 driven by a manual handle is interposed between the support plate 14 and the arm 23. By removing the horizontal pin 18a and expanding and contracting the screw jack 26, the screw Tilt up and down to adjust the angle of inclination. At the adjusted tilt angle position, the horizontal pin 18a is inserted into the tilt angle adjusting hole 24 corresponding to the hole of the support plate 14, and
The support plate 14 is fixed at the inclination angle. Casing 20
Is pivoted so that the support plate 14 and the arm 2
3. Since the angle adjusting plate 25 and the screw jack 26 rotate integrally, the support plate 14 horizontally rotates without any trouble at the adjusted angle.

Next, the three-way valve 16 provided on the trough 11 and its use will be described with reference to FIGS. The three-way valve 16 is a valve provided with a rotatable plug. The plug is rotatably operated by a valve driving mechanism (not shown), and the inlet I and the slurry discharge port E are provided.
1 and the communication between the inlet I and the pig outlet E2 are selectively switched. Inlet I is slurry outlet E1
5 (FIG. 5), the slurry sent from the slurry transport pipe 8 is sent out to the slurry discharge pipe 15 via the three-way valve 16. FIG. 6 shows the use state of the three-way valve 16 when the slurry transport pipe 8 is cleaned by the pig, and the inlet I of the three-way valve 16 communicates with the pig outlet E2. The pig is discharged from the pig outlet E2 of the three-way valve 16 to the atmosphere, fixed to the support plate 14, and placed on the grid-like net 22 of the pig collection device 21 located below the three-way valve 16, and the slurry transport pipe. The pigs fall together with the slurry attached to the inner surface of 8, and only the pigs are captured by the pig collecting device 21 and collected.

[0015]

As described above, according to the present invention, coal ash discharged from a coal-fired boiler of a thermal power plant is collected by a cyclone separator or an electric dust collector, and the coal ash is collected by seawater or the like by an ash-water mixer. To make a slurry, and transport the slurry to a predetermined landfill site by a slurry transport pipe, transport it to a location near the bottom of the landfill by a slurry discharge pipe, and dump it. Is connected to the tip of the slurry transport pipe, and the slurry discharge pipe is connected to the tip of the trough, so that the tip end of the slurry discharge pipe can be easily and easily moved in the horizontal and vertical directions. Depending on the height of the pile,
While avoiding that the released slurry is scattered in the water and avoiding that the tip end of the slurry discharge pipe is blocked by the slurry, the slurry is deposited almost uniformly to an arbitrary height over a wide range of the water bottom. be able to. Since the horizontal turning operation and the vertical tilting operation of the trough can be performed without interrupting the slurry discharging operation, the slurry discharging operation can be continuously performed for a long time. Therefore, the efficiency of the underwater slurry landfill operation can be significantly improved.

A three-way valve is provided on the trough side of the slurry discharge pipe, and a pig collecting device provided with a grid-like net for collecting the washed pig is provided below the three-way valve. Thus, regardless of the position of the trough in the horizontal direction and the vertical inclination angle, the pig collection device is always located below the three-way valve, so that the cleaning pig fed into the slurry transport pipe is transferred to the trough. , And can be reliably collected by the pig collection device. Therefore, expensive pigs can be collected easily and reliably, and the washing cost of the slurry transport pipe can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view of a slurry underwater casting apparatus according to the present invention.

FIG. 2 is a side view schematically showing a basic part of a trough support mechanism of the underwater slurry pouring device of the present invention.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a side view of an embodiment of a trough support mechanism in the underwater slurry pouring device of the present invention.

FIG. 5 is a cross-sectional view of a three-way valve in a slurry submerged casting device of the present invention in a normal state.

FIG. 6 is a cross-sectional view of the three-way valve during a cleaning operation of the slurry transport pipe of the three-way valve in the underwater slurry pouring device of the present invention.

FIG. 7 is a schematic side view of a conventional slurry casting state in a landfill site having a slope.

FIG. 8 is a schematic side view of a conventional slurry casting state at a quay landfill without slopes.

[Explanation of symbols]

 1: Silo 2: Ash quantitative feeder 3: Ash water mixer 4: Water supply pipe 5: Pump 6: Water flow control valve 7: Slurry pump 8: Slurry transport pipe 9: Tip end of slurry transport pipe 10: Submerged casting Apparatus 11: Trough 12: Swivel table 13: Balance weight 14: Support plate 15: Slurry discharge tube 16: Three-way valve 17: Rotating shaft 18: Hinge mechanism 18a: Horizontal pin 19: Support table 20: Casing 21: Pig collection device 22 : Lattice net 23: Arm 24: Angle adjusting hole 24 a: Connecting pin 25: Angle adjusting plate 26: Screw jack I: Three-way valve inlet E1: Three-way valve slurry outlet E2: Three-way valve pig outlet

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-10-311021 (JP, A) JP-A-11-106244 (JP, A) JP-A-10-220006 (JP, A) JP-A-7-107 249404 (JP, A) JP-A-9-306448 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02B 3/18 B09B 1/00 E02D 3/00 E04G 21/04

Claims (1)

(57) [Claims] Claims: 1. Coal ash is slurried with seawater or the like to form a slurry.
-Slurry water transported to a specified landfill site by transport pipe
In the casting apparatus, a trough is connected to the tip of the slurry transport pipe,
A tipping device is connected to a slurry discharge pipe, and a turning device for horizontally turning on a support table is provided , and the turning device tilts the trough up and down.
And the trough is supported by the turning device and the tilting device.
Thereby, a three-way valve provided in the trough, the lower portion of the three-way valve, washed
Pig collection with a grid mesh to collect later pigs
An underwater slurry pouring device comprising a device.