JP2009068727A - Device for preventing scattering of heavy oil ash - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for preventing scattering of heavy oil ash while keeping the quality of heavy oil ash. <P>SOLUTION: The device includes a water supply pipe 21 disposed at an outer periphery of a discharge chute for discharging heavy oil ash J to the external, and a plurality of spray nozzles 25 connected with the water supply pipe 21 and spraying the atomized water W toward the scattering particles R of heavy ash J discharged from the discharge chute 10. As the scattering of heavy ash J is prevented, the circumferential environment can be improved. Further as the quality of heavy oil ash J can be properly kept by spraying of the atomized water W, the utility value of the heavy oil ash J can be improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus for suppressing scattering of heavy oil ash generated by combustion of heavy oil, and more particularly to an apparatus for suppressing scattering of heavy oil ash capable of suppressing the scattering of heavy oil ash while maintaining the quality of heavy oil ash.

  In a thermal power plant using heavy oil as fuel, heavy oil ash is generated by combustion of heavy oil in a boiler. The heavy oil ash becomes fine particles and is discharged from the boiler together with the flue gas, and the heavy oil ash in the flue gas is collected by an electric dust collector. The collected heavy oil ash is sent to a dustless unloader via an ash bin and a rotary feeder. In this dustless unloader, heavy oil ash is appropriately humidified by a spray device. Thereafter, heavy oil ash is discharged from the dispensing chute via the ash loading conveyor and loaded onto the truck. This heavy oil ash is transported to another factory by truck and used as a raw material for other products.

Patent document 1 is known as an example of the prior art regarding powder scattering suppression. The scattering suppression method of Patent Document 1 is to suppress the scattering of cement by forming water curtains radially.
JP-A-7-150547

  However, when loading heavy oil ash onto the truck, the heavy oil ash drops from the discharge chute to the truck bed, causing heavy problems that the heavy oil ash rises and scatters to the surroundings, adversely affecting people and equipment. . In order to prevent heavy oil ash from splashing, it is sufficient to sufficiently humidify the heavy oil ash, but the heavy oil ash loaded on the truck is used as a raw material, so the moisture content is limited and the heavy oil ash is not scattered. Can not be humidified before. In addition, in the method of suppressing scattering by a water curtain as in Patent Document 1, since the film-like water is continuously supplied to a specific place, the moisture content is locally excessive and the powder is mud. When applied to heavy oil ash, there is a problem in quality.

  Then, this invention aims at providing the heavy oil ash scattering suppression apparatus which can suppress scattering of heavy oil ash, maintaining the quality of heavy oil ash.

  In order to achieve the above-mentioned object, the invention according to claim 1 is directed to a water supply pipe provided on an outer periphery of a discharge chute for discharging heavy oil ash to the outside, and a heavy oil connected to the water supply pipe and discharged from the discharge chute. A heavy oil ash scattering suppression device comprising: a plurality of spray nozzles that spray mist-like water toward ash scattering particles.

  According to this invention, the scattered particles of heavy oil ash discharged from the dispensing chute are surrounded by the water sprayed from the plurality of spray nozzles, and the scattered heavy oil ash is suppressed. Further, since the water from the spray nozzle is in the form of mist, the water falls almost uniformly on the discharged heavy oil ash, and the heavy oil ash does not have excessive moisture.

  The invention according to claim 2 is the heavy oil ash scattering suppression device according to claim 1, wherein the spray nozzle is connected to the water supply pipe via a flexible tube that can be bent in all directions. Yes.

  According to a third aspect of the present invention, in the heavy oil ash scattering suppression device according to the first aspect, the flow rate of water sprayed from the plurality of spray nozzles is such that the water content of the heavy oil ash discharged from the dispensing chute is It is characterized in that it is set to be less than the allowable value.

  According to invention of Claim 1, since scattering of heavy oil ash is suppressed, the surrounding environment improvement can be aimed at. Moreover, the quality of heavy oil ash will be maintained moderately by injection of mist-like water, and the utility value of heavy oil ash can be raised. Furthermore, since the scattering of heavy oil ash can be suppressed only by supplying water, it is not necessary to modify the truck that loads heavy oil ash or the surrounding buildings.

  According to the second aspect of the present invention, since the spray direction of water from the spray nozzle can be set freely, even if the scattering direction of heavy oil ash changes depending on the wind direction, the location where the amount of heavy oil ash scattering is large Water can be jetted toward

  According to the invention described in claim 3, since the moisture content of heavy oil ash is equal to or less than the allowable value, the heavy oil ash used as a raw material can be maintained at the quality within the standard.

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

  1 to 6 show an embodiment of the present invention. In FIG. 6, the code | symbol 1 has shown the boiler of the thermal power plant using heavy oil. The boiler 1 generates heavy oil ash (combustion ash) J by burning heavy oil, and the generated heavy oil ash J is guided to the electric dust collector 2 together with smoke. The fine powdery heavy oil ash J collected by the electric dust collector 2 is conveyed to a storage container called an ash bottle 3.

  An upper cut gate 4 is provided below the ash bin 3. The upper cut gate 4 has a gate that can be opened and closed, and allows the heavy oil ash J stored in the ash bin 3 to be supplied downward by opening the gate. A rotary feeder 5 is disposed below the upper cut gate 4. The rotary feeder 5 has a function of supplying heavy oil ash J discharged from the upper cut gate 4 downward in a certain amount. A lower cut gate 6 is provided below the rotary feeder 5. The lower cut gate 6 has a gate that can be opened and closed, and allows the heavy oil ash J supplied by the rotary feeder 5 to be supplied downward by opening the gate.

  A dustless unloader 7 is provided below the lower cut gate 6. The dustless unloader 7 is provided with a humidifying spray 8 at the top, and has a function of humidifying and kneading the heavy oil ash J and supplying it to the next process. An ash loading conveyor 9 is provided below the dustless unloader 7. The ash loading conveyor 9 is a belt conveyor that extends horizontally, and has a function of supplying the heavy oil ash J from the dustless unloader 7 to the dispensing chute 10.

  FIG. 2 shows a dispensing chute 10 that discharges heavy oil ash J to the outside. The payout chute 10 includes a movable chute 11a, a fixed chute 11b, a payout portion 11c, and an elevating drive means 11d. The fixed chute 11b is composed of a cylindrical member having a rectangular cross section, and the upper end portion is connected to the discharge end side of the ash loading conveyor 9. The movable chute 11a is disposed on the outer periphery of the fixed chute 11b and is slidable in the vertical direction with respect to the fixed chute 11b. The movable chute 11a is composed of a cylindrical member having a quadrangular cross-sectional shape, and its upper end can be engaged with the lower end of the fixed chute 11b in the vertical direction. A lifting drive means 11d is connected to the upper end of the outer periphery of the movable chute 11a. The raising / lowering drive means 11d is comprised from the manual winch, and has the function to move the movable chute | shoot 11a to an up-down direction by manual operation. A payout portion 11c is attached to the lower end portion of the movable chute 11a. The payout portion 11 c is formed by forming a plate-like rubber into a rectangular tube shape, and its upper portion is fixed to the lower end portion of the movable chute 11 a via the first fixed plate 12. Side corner portions of the payout portion 11 c are supported by the lower end portion of the movable chute 11 a via the second fixed plate 13.

  The heavy oil ash J from the ash stacking conveyor 9 is supplied into the fixed chute 11b and then discharged from the dispensing unit 11c through the movable chute 11a. When the heavy oil ash J is discharged from the discharge chute 10, the truck 16 stands by directly below the discharge portion 11c, and the heavy oil ash J discharged from the discharge portion 11c falls on the loading platform 16a of the truck 16. Yes. An open / close type dustproof cover (not shown) is attached to the loading platform 16a of the truck 16 so that the loaded heavy oil ash J is prevented from scattering.

  As shown in FIGS. 1 and 2, a heavy oil ash scattering suppression device 20 is provided in the vicinity of the lower portion of the dispensing chute 10. The heavy oil ash scattering suppression device 20 includes a water supply pipe 21, a water supply pipe 22, a flexible tube 23, and a spray nozzle 24. The water supply pipe 21 is formed in a ring shape extending in the horizontal direction, and is disposed on the outer periphery of the lower end of the movable chute 11a. The downstream end of the water supply pipe 22 is connected to the water supply pipe 21, and the upstream side is connected to a water supply source (not shown) via an on-off valve 31 and a flow rate adjusting valve 32 as shown in FIG. Yes. The water supply pipe 21 is supported by four support members 27 arranged on the outer periphery of the movable chute 11a via a fixing bracket 28. In this embodiment, the support member 27 is fixed to the member side that supports the fixed chute 11b, and the water supply pipe 21 is structured not to move in the vertical direction, but the water supply pipe 21 is moved up and down together with the movable chute 11a. It is good also as a structure which moves to.

  A plurality of spray nozzles (full cone nozzles) 25 that inject mist-like water W toward the scattered particles R of the heavy oil ash J discharged from the dispensing chute 10 are attached to the lower surface side of the water supply pipe 21. Each spray nozzle 25 has a characteristic of spraying mist-like water W in a conical shape, and is attached to the water supply pipe 21 via the flexible tube 23. Each spray nozzle 25 is arranged at a predetermined interval in the horizontal direction. The flexible tube 23 is connected to the water supply pipe 21 via a connection fitting 24 provided on the lower surface side of the water supply pipe 21 at the upstream end, and can be bent in all directions. The flexible tube 23 is made of, for example, a thin bellows-like metal tube, and the posture of the spray nozzle 25 can be changed in all directions. In this embodiment, four spray nozzles 25 are attached to the water supply pipe 21 via the flexible tube 23, and the water W from the play nozzle 25 flows over the entire circumference in the circumferential direction of the dispensing portion 11c of the dispensing chute 10. Injection is possible. The flow rate of the water W sprayed from the plurality of spray nozzles 25 is set by the flow rate adjusting valve 32 so that the moisture content of the heavy oil ash J discharged from the dispensing chute 10 is less than an allowable value (for example, 0.18% or less). Has been.

  4 and 5 show details of the spray nozzle 25. The spray nozzle 25 is made of, for example, a synthetic resin. As shown in FIG. 4, a diffusion plate 25 a that disperses water W from the water supply pipe 21 in the radial direction is formed in the internal passage of the spray nozzle 25. The diffusion plate 25a is supported by the nozzle body 25b. A taper screw 25c is formed on the upstream side of the outer peripheral surface of the nozzle body 25b. The taper screw 25 c is screwed to the downstream end portion of the flexible tube 23. The downstream side of the outer peripheral surface of the nozzle body 25b is formed on a hexagonal surface 25e for engaging a tool (not shown) such as a spanner. A spray port 25d is formed at the downstream end of the internal passage of the spray nozzle 25, and mist-like water W is sprayed radially from the spray port 25d. As shown in FIG. 2, since the generation position of the scattered particles R when the heavy oil ash J is discharged from the discharge chute 10 to the loading platform 16a of the truck 16 has been conventionally known, it is directed toward the generation position of the scattered particles R. The posture of the spray nozzle 25 is set so that the water W is jetted.

  Next, the operation in this embodiment will be described. As shown in FIG. 6, the heavy oil ash J generated by the combustion of heavy oil in the boiler 1 of the thermal power plant is then collected by the electric dust collector 2. The heavy oil ash J collected by the electric dust collector 2 is then conveyed to the ash bin 3. The heavy oil ash J stored in the ash bin 3 is periodically supplied to the dustless unloader 7 by the operations of the upper cut gate 4, the rotary feeder 5, and the lower cut gate 6. In the dustless unloader 7, the heavy oil ash J is humidified and kneaded by the moisture supplied from the humidifying spray 8. Thereafter, the heavy oil ash J is discharged from the dustless unloader 7 to the ash loading conveyor 9 side.

  In a state in which the ash loading conveyor 9 is activated, a truck 16 on which the heavy oil ash J is loaded is waiting immediately below the dispensing chute 10. In this state, the movable chute 11a of the payout chute 10 is lowered by the raising / lowering drive means 11d, and the payout portion 11c located at the lowermost part of the payout chute 10 is approaching the loading platform 16a of the truck 16. When the heavy oil ash J from the ash loading conveyor 9 is supplied to the dispensing chute 10, the heavy oil ash J is discharged from the dispensing portion 11c to the loading platform 16a of the truck 16. Although the heavy oil ash J is humidified in the dustless unloader 7, the heavy oil ash J drops from the dispensing chute 10 to the loading platform 16 a of the truck 16, so that the scattered particles R of the heavy oil ash J rise and scatter around. Here, immediately before the heavy oil ash J is discharged from the discharge chute 10, the opening / closing valve 31 of the water supply pipe 22 is opened, and the mist-like water W is discharged from the plurality of spray nozzles 25 connected to the water supply pipe 21. Since the spray is directed toward the scattered particles R of the ash J, the scattering of the heavy oil ash J is suppressed. That is, the scattered particles R of the heavy oil ash J discharged from the dispensing chute 10 are surrounded by the mist-like water W ejected from the plurality of spray nozzles 25. Thus, since the scattering particles R are surrounded by the water W sprayed from the plurality of spray nozzles 25, the scattering particles R fall together with the mist-like water W toward the loading platform 16a of the truck 16, and the scattering particles R are discharged. Diffusion outside the chute 10 is prevented.

  Further, since the water W from the spray nozzle 25 is in the form of mist, the water W from the spray nozzle 25 falls almost uniformly on the discharged heavy oil ash J, and the water content of the heavy oil ash J is moderate. It becomes. That is, the flow rate of the water W sprayed from the plurality of spray nozzles 25 is set by the flow rate adjustment valve 32 so that the moisture content of the heavy oil ash J is equal to or less than the allowable value, and is thus discharged to the loading platform 16a of the truck 16. The water content of the heavy oil ash J is kept moderate, and the heavy oil ash J used as a raw material can be maintained at a quality within the standard.

  In addition, since the spray nozzle 25 is connected to the water supply pipe 21 via the flexible tube 23 that can be bent in all directions, the spraying direction of the water W from the spray nozzle 25 can be freely set. Even when the scattering direction of the heavy oil ash J changes due to the water W, the water W can be jetted toward a place where the heavy oil ash J is scattered. Thus, since the scattering of the heavy oil ash J can be suppressed only by the injection of the water W from the outer periphery of the dispensing chute 10, the modification of the truck 16 for preventing the scattering of the heavy oil ash J and the buildings around the dispensing chute 10 are possible. No need for remodeling.

  The embodiment of the present invention has been described in detail above, but the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, although four spray nozzles 25 are used in this embodiment, the effect of suppressing the scattering of heavy oil ash J can be enhanced by further increasing the number of spray nozzles 25. Moreover, when the heavy oil ash J discharged | emitted from the discharge chute | shoot 10 becomes large, it is good also as a structure which provides another water supply pipe | tube outside the water supply pipe | tube 21, and injects the water W over a large area.

It is a perspective view of the heavy oil ash scattering suppression apparatus concerning Embodiment 1 of this invention. It is a side view which shows the positional relationship of the apparatus of FIG. 1, and the heavy oil ash conveyance truck. It is an enlarged front view of the water supply pipe vicinity in the apparatus of FIG. It is a fragmentary sectional view of the spray nozzle in the apparatus of FIG. It is a front view of the spray nozzle of FIG. It is a conveyance process schematic diagram of the heavy oil ash in the thermal power plant provided with the apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Boiler 2 Electric dust collector 3 Ash bin 4 Rotary feeder 7 Dustless unloader 9 Ash loading conveyor 10 Discharge chute 16 Truck 20 Heavy oil ash scattering suppression device 21 Water supply pipe 22 Water supply pipe 23 Flexible tube 25 Spray nozzle 31 On-off valve 32 Flow rate adjustment valve J Heavy oil ash W Water R Scattered particles

Claims (3)

  A plurality of water supply pipes provided on the outer periphery of the discharge chute for discharging heavy oil ash to the outside, and a plurality of spraying mist-like water toward the scattered particles of heavy oil ash connected to the water supply pipe and discharged from the discharge chute A heavy oil ash scattering suppression device comprising a spray nozzle.   The heavy oil ash scattering suppression device according to claim 1, wherein the spray nozzle is connected to the water supply pipe via a flexible tube that can be bent in all directions.   2. The flow rate of water sprayed from the plurality of spray nozzles is set so that a moisture content of the heavy oil ash discharged from the dispensing chute is equal to or less than an allowable value. Heavy oil ash scattering suppression device.

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