JP5355142B2 - Coal ash transport method and transport apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conveying method and a conveying device for coal ash, easily conveying the coal ash to a coal disposal area on water, apart from a land without using a vessel. <P>SOLUTION: The coal ash C is charged in an ash pit 11, the coal ash C charged in the ash pit 11 is swept away into a pump pit 12 by the flow of water in the coal disposal area S2 supplied from an underwater pump 16, the coal ash C flowing into the pump pit 12 is sucked by a side pump 19, and the coal ash C discharged from the side pump 19 is supplied to a prescribed position in the coal disposal area S2 through an ash conveying pipe 21 arranged along a water surface in the coal disposal area S2. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a transport method and a transport apparatus for transporting coal ash discharged from a thermal power plant to a water ash disposal site.

  Coal ash discharged from thermal power plants is used for landfills such as public water surfaces. Conventionally, a technique for reclaiming coal ash from the revetment side is known (see, for example, Patent Document 1). When coal ash discharged from other thermal power plants is used for landfill, the coal ash is transported by sea to the vicinity of another thermal power plant by ship, and the coal ash is put on a truck with the ship fixed on the pier. After being transferred, the truck is transported to a predetermined location adjacent to the land by truck.

JP 2006-249794 A

  However, when landfilling the coal ash from the land side, the place where the coal ash is put is limited, and the coal ash cannot be thrown all around. In addition, as described above, coal ash discharged from other thermal power plants is transported by ship to a specific landfill site. In this case, if coal ash is introduced from offshore, a wide range is provided. However, it is difficult and difficult to put coal ash from the ship into the ash dump with the ship close to the coast. Therefore, it is desired to develop a technology capable of easily transporting coal ash into an ash disposal site away from land without using a ship.

  Therefore, an object of the present invention is to provide a coal ash transport method and a transport device that can easily transport coal ash into a water ash disposal site away from the land without using a ship.

In order to achieve the above object, the invention according to claim 1 is characterized in that dry coal ash from a thermal power plant is introduced into a descending inclined surface of an ash pit, and the coal ash introduced into the ash pit is A mud is formed by a flow of water that is connected to one pump and is sprayed toward the descending inclined surface from a water supply nozzle that is attached at a predetermined interval in the axial direction of a water supply pipe that extends along the outer edge of the descending inclined surface. The mushroomed coal ash mixed with the water flowing into the pump pit is sucked up by a second pump and discharged from the second pump. The coal ash mixed with the water to be supplied is supplied to a predetermined position in the ash disposal site through an ash transport pipe disposed along the water surface in the ash disposal site. This is an ash transport method.

  According to this invention, the coal ash thrown into the ash pit is pushed into the pump pit by the flow of water, thereby mixing with water and forming a mud and flowing into the pump pit. After that, the muddy coal ash that has flowed into the pump pit is sucked up by the second pump and supplied to a predetermined position in the ash disposal site through an ash transport pipe arranged along the water surface in the ash disposal site. The

  The invention according to claim 2 is the method for transporting coal ash according to claim 1, wherein the water that pushes the coal ash into the pump pit is water in the ash disposal site that is pumped up by the first pump. It is characterized by that.

  A third aspect of the present invention is characterized in that, in the method for conveying coal ash according to the first or second aspect, the ash disposal site is partitioned from the open sea.

The invention according to claim 4 is an ash pit having a downward inclined surface into which dried coal ash from a thermal power plant is charged, and a first pump for supplying water for flushing the coal ash into the ash pit And a water supply nozzle connected to the first pump, attached at a predetermined interval in the axial direction of a water supply pipe extending along the outer edge of the descending inclined surface, and jetting the water toward the descending inclined surface, A pump pit that is formed at the downstream end of the ash pit and in which the coal ash in the form of mud mixed with the water swept in the form of mud by the flow of water gathers; the water that has flowed into the pump pit ; A second pump for sucking up the mixed mud coal ash, and the mud coal ash mixed with the water discharged from the second pump in the ash dump along the water surface in the ash dump Ash transport to be supplied to the specified position A tube, a conveying device coal ash comprising the.

  The invention according to claim 5 is the coal ash transport device according to claim 4, wherein the ash transport pipe is supported by a float floating on a water surface in the ash disposal site.

  The invention according to claim 6 is the coal ash transport device according to claim 4 or 5, wherein the downstream end side of the ash transport pipe is movable in the horizontal direction.

  According to invention of Claim 1 and Claim 4, coal ash and water mix by making coal ash wash away with the water supplied from a 1st pump, and coal ash is made muddy. it can. Therefore, it becomes possible to convey coal ash using a 2nd pump and an ash conveyance pipe, and coal ash can be easily conveyed in the ash disposal place on the water far from the land. Thereby, reclamation from offshore by coal ash becomes possible, and coal ash can be supplied into the ash disposal site over a wide range. Moreover, since it is not necessary to use a ship for conveyance of coal ash, the danger of a high wave is not accompanied and the safety of a landfill operation can be ensured.

  According to invention of Claim 2, since the water in an ash disposal site is used as the water which pushes coal ash to a pump pit, compared with the case where the water of a waterworks is utilized, the reclamation cost of coal ash Can be reduced.

  According to the invention described in claim 3, since the ash disposal site is partitioned from the open sea, the water-imperviousness to the open sea is improved, and even when the weather conditions are bad, the supply of coal ash into the ash disposal site is easy. Become.

  According to the invention described in claim 5, since the ash transport pipe is supported by the float that floats on the water surface, the support structure can be significantly simplified as compared with the case where the ash transport pipe is supported from the bottom of the water. This can reduce the construction cost of the transfer device.

  According to invention of Claim 6, since the downstream end side of an ash conveyance pipe | tube can move to a horizontal direction, the supply direction of coal ash can be freely changed from the water surface.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram of the coal ash conveying apparatus concerning Embodiment 1 of this invention. FIG. 2 is an enlarged plan view of the apparatus of FIG. 1. It is an enlarged plan view of the ash pit in the apparatus of FIG. It is sectional drawing which follows the AA line of FIG. FIG. 4 is an enlarged plan view of a pump pit in FIG. 3. It is sectional drawing which shows the injection | throwing-in state to the ash pit of coal ash using the apparatus of FIG. It is a top view which shows the support state of the ash conveyance pipe | tube in the apparatus of FIG. It is sectional drawing which shows the support state of the ash conveyance pipe | tube in the apparatus of FIG. FIG. 8 is an enlarged plan view of the float of FIG. 7. It is an expanded sectional view which shows the support state of the ash conveyance pipe by the float of FIG. FIG. 11 is an exploded view showing the float holding structure of FIG. 10. It is an enlarged front view of the ash conveyance pipe of FIG. It is an enlarged front view of the flange in the ash conveyance pipe of FIG.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 13 show an embodiment of the present invention. As shown in FIG. 1, a pier 2 that extends linearly toward the open sea S1 is formed on the land 1 side. On the land 1 side, there is provided a transport device 10 for transporting the coal ash C discharged from the thermal power plant to a predetermined position in the ash disposal site S2 partitioned from the open sea S1 by the water shielding structure 3. The transport apparatus 10 mainly includes an ash pit 11, a pump pit 12, a submersible pump 16 as a first pump, a sand pump 19 as a second pump, and an ash transport pipe 21.

  The ash pit 11 protrudes from the land 1 to the outer sea S1 side, and is formed by reclaiming a part of the ash disposal site S2 that is an inland sea. The ash pit 11 has an ash pit main body 11a into which coal ash C is introduced and a stop 11e where a truck (cargo vehicle) 5 stops. As shown in FIG. 4, the ash pit main body 11a is comprised from the 1st inclination part 11b, the 2nd inclination part 11c, and the bottom part 11d. The first inclined portion 11b is formed on an inclined surface that descends toward the bottom portion 11d. The 2nd inclination part 11c is located so that the 1st inclination part 11b may be opposed, and is formed in the inclined surface which goes down toward the bottom part 11d. The bottom portion 11d is located between the first inclined portion 11b and the second inclined portion 11c, and is formed on an inclined surface that descends toward the ash disposal site S2.

  As will be described later, the ash pit body 11a is supplied with water W1 for flushing the coal ash C. As the water W1 for flushing the coal ash C, the water in the ash disposal site S2 is used. A pump pit 12 is formed at the downstream end of the bottom 11d in the ash pit body 11a. The pump pit 12 is a place for temporarily storing the coal ash C and the water W1 flowing from the bottom portion 11d, and is formed at a position lower than the bottom portion 11d. As shown in FIG. 5, the pump pit 12 has a quadrangular planar shape, and the outer peripheral wall 14 is reinforced with a steel frame. The pump pit 12 is partitioned into a first pit 12a and a second pit 12b by a partition plate 14a. A submersible pump 16 as a first pump is disposed in the first pit 12a. The submersible pump 16 has a built-in electric motor and pump driven by power supply, and has a function of supplying the pumped water W1 to a water supply pipe 17 to be described later by driving the pump with the electric motor.

  Connected to the pump pit 12 is a water conduit 15 that guides the water W1 into the first pit 12a. The downstream side of the water conduit 15 is connected to the suction port of the submersible pump 16 disposed in the first pit 12a. The water conduit 15 extends from the first pit 12a toward the ash disposal site S2, and an upstream end opens toward the ash disposal site S2. A water supply pipe 17 that supplies water W1 from the water conduit 15 to the ash pit body 11a side is connected to the discharge port of the submersible pump 16. As shown in FIG. 3, the water supply pipe 17 is extended along the outer edge of the 1st inclination part 11b in the ash pit main body 11a. A plurality of water supply nozzles 17a for supplying water W1 to the ash pit main body 11a are attached to the water supply pipe 17. The water supply nozzles 17 a are attached at a predetermined interval in the axial direction of the water supply pipe 17. Each water supply nozzle 17a injects the water W1 toward the 1st inclination part 11b of the ash pit main body 11a.

  The first inclined portion 11b of the ash pit main body 11a is a portion where the coal ash C from the truck 5 falls, and the coal ash C dropped on the first inclined portion 11b moves to the bottom portion 11d. . Coal ash C remaining in the first inclined portion 11b is pushed to the bottom portion 11d by the water W1 sprayed from each water supply nozzle 17a. In the vicinity of the upper end of the first inclined portion 11b, a vehicle stop 18 for restricting the backward movement of the truck 5 stopped at the stop 11e is provided. By disposing the car stop 18 on the outer side (stop 11e side) of the water supply pipe 17, the water supply pipe 17 is prevented from being crushed by the tire of the truck 5.

  In the second pit 12 b of the pump pit 12, the coal ash C charged into the ash pit body 11 a and swept away by the water W <b> 1 gathers. The upper part of the second pit 12b is open toward the bottom part 11d, and the height of the opening part of the second pit 12b is slightly lower than the upper surface of the bottom part 11d of the ash pit body 11a. The coal ash C that has moved to the bottom 11d of the main body 11a is swept away by the water W1 and flows into the second pit 12b. A sand pump 19 as a second pump is arranged in the second pit 12b. The suction port of the sand pump 19 opens to the second pit 12b. The sand pump 19 has a built-in electric motor and pump driven by power supply, and has a function of supplying the sucked water W1 and coal ash C to an ash transport pipe 21 to be described later by driving the pump with the electric motor. ing.

  As shown in FIG. 5, one end of an ash transport pipe 21 is connected to the discharge port of the sand pump 19. As shown in FIG. 8, the ash transport pipe 21 is disposed along the water surface S2a of the ash disposal site S2, and the ash transport pipe 21 extends to the vicinity of the water shielding structure 3 that partitions the open sea S1 and the ash disposal site S2. ing. As shown in FIGS. 12 and 13, the ash transport pipe 21 is composed of a cylindrical steel pipe 21 a and a flange 21 b, and the flange 21 b is attached to both ends of the steel pipe 21 a in the axial direction. A plurality of connecting holes 21c through which fastening bolts (not shown) are inserted are formed in the flange 21b. As shown in FIG. 7, a sleeve 23 is attached to the end portion of the ash transport tube 21 to give the connecting portion of the ash transport tube 21 flexible. The sleeve 23 is composed of a cylindrical rubber member that can be bent in any direction. The transport apparatus 10 can transport the coal ash C in the second pit 12b to the offshore area in the ash disposal site S2 by connecting a plurality of ash transport pipes 21 in series in the axial direction.

  As shown in FIGS. 7 and 8, the ash transport pipe 21 is supported by a plurality of floats 22 floating on the water surface S2a of the ash disposal site S2. The float 22 has a pair of float main bodies 22a and a connecting frame 22c. The float body 22a is made of a lightweight member having a small specific gravity, such as a polystyrene foam. The float body 22a has a substantially bowl-shaped outer shape. Two metal bands 22b are wound around the outer periphery of each float body 22a. Each band 22b is connected via a connecting plate 22d. The pair of float main bodies 22a are coupled in the horizontal direction via a coupling frame 22c that can be connected to each band 22b. As shown in FIG. 11, an arc-shaped receiving groove 22c1 for receiving the ash transport pipe 21 is formed on the upper surface of the connecting frame 22c.

  An ash transport tube 21 is placed on the upper surface of the connection frame 22c. The ash transport tube 21 is pressed against the receiving groove 22c1 by a clamp 22e that is screwed to the connecting frame 22c by a bolt 22f, whereby the ash transport tube 21 is held by the connecting frame 22c. As shown in FIG. 8, the float 22 is connected to two anchor blocks 24 installed on the water bottom G in the ash disposal site S <b> 2 via two wire ropes 25. As shown in FIG. 10, the upper end of the wire rope 25 is connected to a connector 22g provided on the lower surface side of each float body 22a. The lower end of each wire rope 25 is connected to an anchor block 24 installed at a predetermined distance on the left and right with respect to the float 22. That is, each wire rope 25 extends toward the bottom G in the ash disposal site S2 so as to be separated from the float 22 in the left-right direction, whereby the float 22 extends in a direction perpendicular to the axial direction of the ash transport pipe 21. Misalignment is prevented.

  The downstream end side of the ash transport pipe 21 is movable in the horizontal direction. As described above, since each ash transport tube 21 is connected via the sleeve 23 having flexibility, several ash transports close to the downstream end with respect to the ash transport tube 21 positioned on the upstream side. The tube 21 can be moved in the horizontal direction (arrow F direction). By moving the ash transport pipe 21 on the downstream end side in the horizontal direction, the supply and discharge position of the coal ash C from the ash transport pipe 21 can be changed, and the coal ash C is supplied in a wide range into the ash disposal site S2. It becomes possible. Further, by disposing a baffle plate (not shown) that can collide with the coal ash C in the vicinity of the downstream end of the transport pipe 21, it is possible to change the supply direction of the coal ash C into the ash disposal site S2. .

  Next, a method for transporting coal ash using the transport apparatus 10 of FIG. 1 will be described.

  As shown in FIG. 1, the coal ash C transported from another thermal power plant by the ship 4 is carried out from the ship 4 in the vicinity of the pier 2 and placed on a truck 5. Thereafter, the truck 5 travels toward the ash pit 11 and arrives at the stop 11e. Then, the truck 5 injects the loaded coal ash C into the ash pit main body 11a by tilting the loading platform while stopped at the stop 11e. Since the first inclined portion 11b where the coal ash C from the truck 5 falls is formed on an inclined surface that descends toward the bottom portion 11d, the dropped coal ash C is shifted to the bottom portion 11d side by its own weight.

  When the charging of the coal ash C into the ash pit main body 11 a is completed, the submersible pump 16 is activated, and the water W1 in the ash disposal site S2 is guided to the submersible pump 16 through the water conduit 15. Since the submersible pump 16 pumps the water W1 from the water conduit 15 to the water supply pipe 17, as shown in FIG. 6, the water W1 flows from each water supply nozzle 17a of the water supply pipe 17 toward the first inclined portion 11b. The coal ash C that is injected and remains in the first inclined portion 11b is swept away toward the bottom portion 11d. And since the bottom part 11d is formed in the inclined surface which goes down as it goes to the ash disposal site S2, the coal ash C located in the bottom part 11d is directed to the pump pit 12 by the water W1 as shown in FIG. Washed away. Thereby, the coal ash C located in the bottom part 11d flows into the 2nd pit 12b with the movement of the water W1 supplied to the bottom part 11d.

  When the coal ash C flows into the second pit 12 b, the coal ash C in the second pit 12 b is supplied toward the ash transport pipe 21 by the activation of the sand pump 19. Here, since the coal ash C stored in the second pit 12b is mixed with the water W1 and is in a muddy state, the coal ash C can be conveyed by the sand pump 19. That is, the coal ash C is dry in the state discharged from the thermal power plant and cannot be transported by the pump. However, the coal ash C becomes nearly mud by mixing with the water W1, so the submersible pump 16 Can be conveyed by the sand pump 19 having the same function.

  Since the ash transport pipe 21 is disposed along the water surface S2a in the ash disposal site S2, the ash transport pipe 21 is substantially horizontal over the entire length. Therefore, the coal ash C pumped to the ash transport pipe 21 is smoothly transported to the shore of the ash disposal site S2 and supplied from the downstream end of the ash transport pipe 21 into the ash disposal site S2. Here, if the coal ash C is continuously supplied to the same position, the coal ash C concentrates and accumulates at one place. Therefore, the fixing position of the ash transport pipe 21 by the anchor block 24 can be changed periodically. Necessary. Since the downstream end side of the ash transport pipe 21 is movable in the horizontal direction, the supply position of the coal ash C from the ash transport pipe 21 can be changed, and the coal ash C can be moved within a wide range within the ash disposal site S2. It becomes possible to supply to.

  Thus, since the coal ash C can be made into a mud by being swept away by the water W1 supplied from the submersible pump 16, the coal ash C can be transported using the sand pump 19 and the ash transport pipe 21. It becomes possible, and the coal ash C can be easily transported offshore of the ash disposal site S2 away from the land 1. Thereby, reclamation from offshore by coal ash C becomes possible, and coal ash C can be thrown into ash disposal site S2 over a wide range. And since it is not necessary to use a ship for conveyance of coal ash C, the danger of a high wave does not accompany and the safety | security of a landfill operation can be ensured.

  Moreover, since the water in the ash disposal site S2 is used as the water W1 that pushes the coal ash C into the pump pit 12, the landfill cost of the coal ash C should be reduced as compared with the case of using water from the waterworks. Can do. Furthermore, since the ash disposal site S2 is partitioned from the open sea S1 by the water-impervious structure 3, the water shielding property with the open sea S1 is improved, and the ash disposal site S2 is maintained in a relatively calm state even under bad weather conditions. The coal ash C can be easily put into the ash disposal site S2.

  Furthermore, since the ash transport pipe 21 is supported by the float 22 floating on the water surface S2a in the ash disposal site S2, the ash transport pipe 21 is supported by a structure having a foundation on the bottom G of the ash disposal site S2. The support structure can be remarkably simplified, and the construction cost of the transfer device 1 can be reduced.

  The embodiment of the present invention has been described in detail above, but the specific configuration is not limited to the above-described embodiment, and even if there is a design change or the like without departing from the gist of the present invention, It is included in this invention. For example, the submersible pump 16 is used as the first pump and the sand pump 19 is used as the second pump, but other types of pumps are used as long as they have the required functions. It is good also as a structure.

DESCRIPTION OF SYMBOLS 1 Land 2 Pier 3 Water-impervious structure 4 Ship 5 Truck 10 Conveying device 11 Ash pit 11a Ash pit main body 12 Pump pit 15 Water conduit 16 Submersible pump (first pump)
17 Water supply pipe 19 Sand pump (second pump)
21 Ash transport pipe 22 Float 24 Anchor block 25 Wire rope C Coal ash S1 Outer sea S2 Ash disposal S2a Water surface

Claims (6)

Dried coal ash from a thermal power plant is put into the down slope of the ash pit, and the coal ash put into the ash pit is connected to a first pump , along the outer edge of the down slope To the pump pit formed at the downstream end of the ash pit in the form of mud by the flow of water sprayed from the water supply nozzle attached at a predetermined interval in the axial direction of the extending water supply pipe toward the downward inclined surface The muddy coal ash mixed with the water flowing into the pump pit is sucked up by the second pump, and the muddy coal ash mixed with the water discharged from the second pump is ash discarded. A method for transporting coal ash, comprising: supplying to a predetermined position in the ash disposal site through an ash transport pipe disposed along a water surface inside the ash.   The method for conveying coal ash according to claim 1, wherein the water that pushes the coal ash into the pump pit is water in the ash disposal site that is pumped up by the first pump.   The method for transporting coal ash according to claim 1 or 2, wherein the ash disposal place is partitioned from the open sea. An ash pit having a downwardly inclined surface into which dry coal ash from a thermal power plant is charged; and
A first pump for supplying water to flush the coal ash into the ash pit;
A water supply nozzle connected to the first pump, attached at a predetermined interval in an axial direction of a water supply pipe extending along an outer edge of the descending inclined surface, and injecting the water toward the descending inclined surface;
A pump pit in which the coal ash in the form of mud mixed with the water formed in the downstream end of the ash pit and swept into the mud by the flow of water gathers;
A second pump for sucking up the muddy coal ash mixed with the water flowing into the pump pit;
An ash transport pipe for supplying the mud coal ash mixed with the water discharged from the second pump to a predetermined position in the ash dump along the water surface in the ash dump;
A coal ash conveying apparatus comprising:   The coal ash transport device according to claim 4, wherein the ash transport pipe is supported by a float floating on a water surface in the ash disposal site.   The coal ash transport device according to claim 4 or 5, wherein a downstream end side of the ash transport pipe is movable in a horizontal direction.

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