JP5601689B2 - Slag treatment equipment in waste melting treatment equipment - Google Patents

Description

  The present invention relates to a slag processing facility for slurrying and transporting slag selected by wet magnetic separation from a pulverized material of a melt in a waste melting furnace of a waste melting processing facility. The present invention relates to a slag treatment facility capable of controlling the liquid level of equipment in the facility.

  When melting waste such as municipal waste and various industrial wastes in a waste melting furnace, the melt is discharged into a granulated water tank as a treatment method for the melt discharged from the waste melting furnace. In addition, there is known a method in which a metal component is subjected to a water granulation treatment, the water granulated slag and a metal are separated, and the slag is slurried and conveyed to a post-treatment process (see Patent Document 1).

  In Patent Document 1, as shown in FIG. 2, the melt 1 discharged from the waste melting furnace flows down into the granulated water tank 2 and is subjected to a water granulation treatment. 3 is picked up by the conveyor 4 and supplied to the vibrating screen 5.

  Since the slag, metal, and large lumps are mixed in the granulated product 3 supplied to the vibration sieve 5, the large lumps are separated by the vibration sieve 5, and the granulated material obtained by separating the large lumps is wet magnetic separation. It is sent to the machine 6 and separated into slag and metal.

  The slag separated by the wet magnetic separator 6 is sent to the vibrating sieve 7 to screen out slag having a slag particle size of 5 mm or less suitable for slurry conveyance.

  The slag of 5 mm or less separated by the vibration sieve 7 is supplied to the slurry supply tank 8 and stirred with stirring water. In the slurry supply tank 8, water for slurrying is returned from the slag draining conveyor 12 in the subsequent process to the wet magnetic separator 6 by the circulation pump 19 through the water return pipe 13 as magnetic selective water for wet magnetic separation, and through the vibrating sieve 7. (In normal operation, the water return pipe 13 is branched into a pipe to the wet magnetic separator 6 and a pipe to the slurry supply tank 8, but the pipe to the slurry supply tank 8 is connected to the slurry supply tank 8. After the branching, an open / close valve is provided and always closed.)

  A plurality of stirring nozzles 9 are arranged at intervals in the lower part of the slurry supply tank 8, and the supernatant liquid extracted from the drain outlet 14 at the upper part of the slurry supply tank 8 by the stirring pump 10 is stirred water. As a result, the slurry is jetted through the stirring water circulation pipe 11 and the slurry is stirred. In addition, the partition wall 15 is installed in the vicinity of the drain port 14 so that the supernatant liquid is drained to prevent the slurry from flowing into the stirring pump 10 and to prevent the stirring pump 10 from being damaged.

  In the slurry supply tank 8, a slurry suction port 16 is disposed, the slurry is sucked by the slurry pump 17, and the slurry is sent to the slag draining conveyor 12 through the slurry transport pipe 18. The slurry of the slag draining conveyor 12 is drained by a scraper type or screw type draining conveyor 12, and the drained slag is sent to a slag yard. Since the draining conveyor 12 is also used as a slurry water tank for sending slurry water to the slurry supply tank 8 and the wet magnetic separator 6, a circulation pump 19 connected to the water return pipe 13 is provided in the draining conveyor 12. Has been placed.

  In the slag processing facility described in Patent Document 1, when slurry is transferred from the slurry supply tank 8 to the slag draining conveyor 12 via the slurry transfer pipe 18 by the slurry pump 17, as shown in FIG. 3, a flow meter (FT), The flow rate of the slurry is made constant by controlling the number of revolutions of the slurry pump 17 using a flow rate indicating controller (FIC) and an inverter (INV.).

  Slurry water is returned from the slag draining conveyor 12 to the wet magnetic separator 6 via the water return pipe 13 by the circulation pump 19 as magnetically selected water and merged with the crushed material. The magnetic separation water of the wet magnetic separator 6 is sent to the slurry supply tank 8. The liquid level in the slurry supply tank 8 is measured by a level meter (LT), monitored by a level indicating alarm meter (LIA), and the discharge flow rate of the circulation pump 19 is adjusted with respect to the liquid level fluctuation in the slurry supply tank 8.

  The liquid level of the slag draining conveyor 12 is measured by a level meter (LT). When the liquid level is lowered, the on-off valve 20 is opened by the level indicating alarm meter (LIA) and industrial water (PS) is supplied.

  As described above, the slurry water for slurrying slag in the slurry supply tank 8 is circulated between the slurry supply tank 8, the slag draining conveyor 12, the wet magnetic separator 6, and the slurry supply tank 8.

JP 2008-178802 A

  The slag treatment facility described in Patent Document 1 has the following problems in terms of operation stability and functions.

(1) Due to the configuration of the equipment of the treatment facility, the flow rate of the granulated material 3 flowing from the granulation tank 2 to the wet magnetic separator 6 varies depending on the interval between the hot water and the amount of hot water, so that the wet magnetic separator 6 moves to the slurry supply tank 8. The slurry concentration sent also varies. On the other hand, the flow rate of the slurry conveyed from the slurry supply tank 8 to the slag draining conveyor 12 is controlled to be constant by controlling the number of revolutions of the slurry pump 17.

  The liquid level in the slurry supply tank 8 is measured by the level meter LT, and the discharge flow rate of the circulation pump 19 of the slag draining conveyor 12 is adjusted for the liquid level fluctuation in the slurry supply tank 8, but to the slurry supply tank 8. The slurry water to be supplied is returned from the draining conveyor 12 to the wet magnetic separator 6 by the circulation pump 19 via the water return pipe 13 and then returned to the wet magnetic separator 6 and further returned to the slurry supply tank 8 via the vibrating sieve 7. After adjusting the discharge flow rate, a large time delay occurs until the flow rate of the slurrying water flowing into the slurry supply tank 8 is adjusted. On the other hand, since the control of the slurry concentration is impossible, when the slurry has a high concentration, the amount of slag in the slurry sent from the slurry supply tank 8 to the slag draining conveyor 12 by the slurry pump 17 is large, and the amount of water is reduced. Therefore, the amount of water withdrawn from the slurry supply tank 8 by the slurry pump 17 is reduced, and the supply of water for slurrying to the slurry supply tank 8 is adjusted with a time delay from the slag draining conveyor 12 via the wet magnetic separator 6 and the vibrating sieve 7. Until it is done, the liquid level of the slurry supply tank 8 increases.

  On the contrary, when the slurry has a low concentration, the amount of slag in the slurry sent from the slurry supply tank 8 to the slag draining conveyor 12 by the slurry pump 17 is small, the amount of water is large, and the amount of water drawn from the slurry supply tank 8 is large. The liquid level of the slurry supply tank 8 is lowered.

  Thus, when the slurry concentration varies, the liquid level in the slurry supply tank 8 varies.

  For example, when the liquid level in the slurry supply tank 8 fluctuates and the liquid level is lowered, the interlock of the slurry pump 17 is stopped due to insufficient water supply when the liquid level is lowered for the purpose of machine protection. The automatic operation of the processing system is interrupted and the stability of the operation is impaired.

(2) The slurry supply tank 8 is connected by a slag draining conveyor 12 and a water return pipe 13 for slurrying water, and the liquid level control of the slurry supply tank 8 is provided in the slag draining conveyor 12. This is performed by increasing or decreasing the discharge flow rate of the circulation pump 19 of the pipe 13.

  However, the slag draining conveyor 12 is usually installed on the upper floor of the wet magnetic separator 6 and the slurry supply tank 8 in terms of the arrangement of the waste melting treatment equipment. In this case, regardless of whether the circulation pump 19 of the slag draining conveyor 12 on the upper floor is stopped, the slurrying water flows into the slurry supply tank 8 due to the siphon effect of the water return pipe 13, or the flow resistance due to the gas-liquid mixed phase flow acts. In some cases, the flow rate of water returned to the slurry supply tank 8 is not stable, and the slurry supply tank liquid level is not stable due to the change in the slurry concentration described in (1) above, and cannot be controlled constantly.

(3) The supply of magnetically separated water to the wet magnetic separator 6 is such that the water for slurrying is sent from the slag draining conveyor 12 through the water return pipe 13 by the circulation pump 19, but the flow rate is relative to the liquid level fluctuation in the slurry supply tank 8. Therefore, the flow rate of the slurrying water cannot follow the fluctuation of the amount of the crushed material flowing into the wet magnetic separator 6 and the stagnation of the crushed material at the inlet of the wet magnetic separator 6 A decrease in magnetic separation efficiency may occur and the function of the wet magnetic separator 6 may be impaired.

  Accordingly, the present invention provides a slag treatment facility for waste melting treatment equipment that circulates slurry water between wet magnetic separators, slurry supply tanks, and slag draining conveyors, and circulates slurry water against slurry concentration fluctuations. The present invention provides a slag treatment facility that can stably operate by controlling the flow rate and the liquid level of each device.

  The present invention relates to a wet magnetic separator that separates slag and metal that have been sieved from a granulated product obtained by subjecting a melt discharged from a waste melting furnace of a waste melting processing facility that melts waste to a granulated product. And a vibration sieve for sieving a large mass from the slag separated by the wet magnetic separator, a slurry supply tank for slurrying the slag separated by the vibration sieve, and a slurry pump conveyed from the slurry supply tank In a slag treatment facility in a waste melting treatment facility equipped with a draining conveyor for draining slurry, the slag draining conveyor is installed at a level at which water for slurrying can be fed to the slurry supply tank by gravity of the slurrying water, Slurry water overflowed from the slurry water overflow port provided in the slag drainer conveyer is supplied to the slurry supply tank. I have a pipe for water supply by gravity of slurrying water, characterized by comprising a water pump for sending the slurry of water into the wet magnetic separator from the slurry supply vessel.

  In the above configuration, a partition wall having a water passage may be provided in the vicinity of the slag dropping position of the slurry supply tank, or a partition wall having a water passage may be provided in the vicinity of the overflow port of the slag draining conveyor. In addition, a plurality of partition walls may be provided in parallel in the vertical direction, and water channels that meander in the vertical direction may be formed by alternately arranging the water flow paths of the partition walls in the vertical direction. In addition, a detector for detecting the liquid level of the slurry supply tank and draining conveyor, a calculator for monitoring and summing each of the detected liquid levels, and a decrease in the total amount of slurry water in the system. An on-off valve for industrial water that replenishes water can be provided.

  In the present invention, the slurrying water overflowing from the draining conveyor flows down through the gravity return pipe, and the slurry flowing into the draining conveyor is returned to the slurry supply tank according to the change in the amount of the slurry. The Therefore, the liquid level of the draining conveyor and the slurry supply tank is only reduced by the reduction in take-out due to slag adhesion from the drainage conveyor. Since it is stable because it is replenished, the stability of the operation can be ensured.

  In the present invention, since the slag draining conveyor is installed at a level at which slurry water can be fed to the slurry supply tank by gravity, the slurry water from the draining conveyor to the slurry supply tank can be removed by gravity without the circulation pump. By returning the water, the flow rate of water returned to the slurry supply tank is stabilized and the fluctuation of the slurry supply tank liquid level can be controlled stably and constantly. It is possible to prevent the interlock from working and stop, and stable operation becomes possible.

  The present invention provides a slurry supply tank with a circulation pump that constantly supplies water for slurrying to a wet magnetic separator at a flow rate corresponding to the maximum amount of fluctuation of the inflow of the melt. Since it is possible to prevent the stagnation of the melt and the decrease in magnetic separation efficiency, it is possible to ensure a good wet magnetic separator function.

  According to the present invention, a clear supernatant liquid can be obtained by providing a partition wall having a water passage in the vicinity of the slag dropping position of the slurry supply tank and in the vicinity of the overflow port of the slag draining conveyor.

It is a figure which shows the flow of the water for slurrying of the slag processing equipment of this invention. It is a general view of the conventional slag processing equipment. It is a figure which shows the flow of the water for slurrying of the conventional slag processing equipment.

  An embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a slag treatment facility of the present invention, and the same members as those in the conventional slag treatment facility shown in FIGS. 2 and 3 are denoted by the same reference numerals. In FIG. 1, the slag processing facility of the present invention includes a wet magnetic separator 6, a slurry supply tank 8, and a slag draining conveyor 12 as in the slag processing facility of FIG. The slag draining conveyor 12 is installed at a level at which slurry water can be fed to the slurry supply tank 8 by the gravity of the slurry water, such as the upper floor of the slurry supply tank 8.

  The flow of slag in the slag treatment facility of the present invention is the same as that of the conventional slag treatment facility. In FIG. 1, the melt discharged from the waste melting furnace flows down into a granulated water tank and is subjected to a water granulation process. The granulated product obtained by separating a large mass by a vibrating sieve is sent to a wet magnetic separator 6 and slag. Metal is separated. The separated slag is sent to the vibrating sieve 7 to remove large lumps, and slag having a particle size suitable for slurry conveyance is selected, and the selected slag is sent to the slurry supply tank 8. In addition, the slurry supply tank 8 may be provided with slurry stirring means by ejecting stirring water, similarly to the slurry supply tank 8 shown in FIG.

  The slurry in the slurry supply tank 8 is sucked in by the slurry pump 17 from the slurry suction port 16 in the slurry supply tank 8 and sent to the slag draining conveyor 12.

  In the slag draining conveyor 12, the slurry is scraped up and drained by a scraper type or screw type draining conveyor, and the drained slag is sent to a slag yard.

  Next, the water for slurry which flows between each apparatus in the slag processing equipment of this invention, and the liquid level of each apparatus are demonstrated.

  The water for magnetic separation of the wet magnetic separator 6 is supplied and circulated from the slurry supply tank 8 by using the water pump 20 to draw up the slurry water. The storage volume of the slurry supply tank 8 is set to a volume necessary and sufficient for installing the water pump 20.

  In the slurry supply tank 8, a partition wall 15 having a water passage at the lower part is installed in the vicinity of the drop position of the slag separated by the vibrating sieve 7 to suppress mixing of the slag to the water pump 20 side and drain the supernatant liquid. In this way, slurry inflow is prevented and damage to the water pump 20 is prevented. The upper end of the partition wall 15 is extended to the ceiling of the slurry supply tank 8 so that the splash of the slurry on the water surface does not enter.

  A plurality of partition walls 15 are provided in parallel in the vertical direction instead of a single partition wall, and the water passages of the partition walls 15 are alternately arranged in the vertical direction so that a water channel meandering in the vertical direction is formed. The partition wall 15 having a water passage can extend a lower end to the bottom of the tank to prevent entry of slurry, thereby obtaining a clear supernatant liquid.

  Since the water for magnetic separation of the wet magnetic separator 6 is supplied from the slurry supply tank 8 by the water pump 20, the conventional technique shown in FIG. 2 is used to increase or decrease the discharge flow rate of the circulation pump 19 with respect to the liquid level fluctuation in the slurry supply tank 8. Compared with the supply by the magnetic field, in the present invention, the magnetic separation water having the required maximum flow rate can be constantly supplied regardless of the fluctuation of the inflow amount of the melt. It is possible to prevent the inflowing melt from staying at the inlet and to prevent the magnetic separation efficiency from decreasing.

  Slurry water for slurrying slag in the slurry supply tank 8 is supplied from a slag draining conveyor 12 installed on the upper floor of the slurry supply tank 8. The slag draining conveyor 12 is formed with an overflow port 21 at the top thereof where the slurry water overflows.

  In the slag draining conveyor 12, a partition wall 15 having a water passage in the lower part is installed in the vicinity of the overflow port 21 to suppress the mixing of slag to the overflow port 21 side so that the supernatant liquid flows out. To prevent. The upper end of the partition wall 15 is extended to the ceiling of the slag draining conveyor 12 so that the splash of the slurry on the water surface does not enter.

  Similar to the slurry supply tank 8, the partition walls 15 are not provided alone, but a plurality of partition walls 15 are provided in parallel in the vertical direction, and the water passages of the partition walls 15 are alternately arranged in the vertical direction and meander in the vertical direction. A water channel can be formed so that a clear supernatant is obtained. The partition wall 15 having a water passage at the upper part extends the lower end to the bottom of the tank to prevent entry of slurry.

  The overflow port 21 is connected to the slurry supply tank 8 by a water return pipe 13. Gravity-type water return piping shall have a diameter sufficient to allow the overflow flow to flow without restriction. Slurry draining conveyor 12 is installed at a level at which slurry water on the upper floor of slurry supply tank 8 and the like can be fed to slurry supply tank 8 by gravity, and the slurry water overflowed from overflow port 21 is utilized. Is returned to the slurry supply tank 8 through a water return pipe 13 that feeds water by gravity.

  Even if the slurry is sent from the slurry supply tank 8 to the slag draining conveyor 12 and the liquid level of the slurry supply tank 8 is lowered, the liquid level of the slag draining conveyor 12 is raised correspondingly, and the water for slurry overflows from the overflow port 21. Since the water is returned to the slurry supply tank 8 through the water return pipe 13 by gravity, the liquid level of the slurry supply tank 8 is not rapidly lowered by the slurry conveyance.

  The liquid level of the slurry supply tank 8 and the draining conveyor 12 is individually and collectively monitored, and an opening / closing valve 22 is opened on the draining conveyor for the decrease in the total storage amount in the system (the amount taken out from the draining conveyor 12 to the slag). Supply industrial water (PW). For example, the liquid level of the slurry supply tank 8 and the slag draining conveyor 12 is detected by a level meter (LT), calculated by a level calculator (LY), and a level indicator / alarm unit (LIA) for opening the opening / closing valve 22. Since it is opened and industrial water (PW) is supplied and overflows and flows down to the slurry supply tank 8, the liquid levels of the slag draining conveyor 12 and the slurry supply tank 8 are kept constant.

  Therefore, the fluctuation of the liquid level in the slurry supply tank 8 is small, and the slurry pump 17 is prevented from being stopped by the interlock due to the insufficient amount of water supplied when the liquid level is lowered, and automatic operation can be continued.

1: Melt 2: Granulated water tank 3: Granulated material 4: Conveyor 5: Vibrating sieve 6: Wet magnetic separator 7: Vibrating sieve 8: Slurry supply tank 9: Stirring nozzle 10: Pump for stirring 11: Circulation of stirring water Pipe 12: Slag draining conveyor 13: Water return pipe 14: Stirring water drain 15: Partition wall 16: Slurry suction port 17: Slurry pump 18: Slurry transport pipe 19: Circulation pump 20: Water pump 21: Overflow port 22: On-off valve

Claims (5)

A wet magnetic separator that separates slag and metal sieved from a granulated product obtained by subjecting a melt discharged from a waste melting furnace of a waste melting processing facility to melt the waste;
A vibrating sieve for sieving a large mass from the slag separated by the wet magnetic separator;
A slurry supply tank for slurrying the slag separated by the vibrating sieve;
In the slag treatment facility in the waste melting treatment facility equipped with a draining conveyor for draining the slurry conveyed by the slurry pump from the slurry supply tank,
The slag draining conveyor is installed at a level at which water for slurrying can be fed to the slurry supply tank by gravity of water for slurrying,
A pipe for feeding the slurrying water overflowed from the slurrying water overflow port provided in the slag draining conveyor to the slurry supply tank by gravity of the slurrying water;
A slag treatment facility in a waste melting treatment facility, comprising a water supply pump for sending water for slurrying from the slurry supply tank to the wet magnetic separator.   The slag treatment facility in the waste melting treatment facility according to claim 1, wherein a partition wall having a water passage is provided in the vertical direction in the vicinity of the slag drop position of the slurry supply tank.   The slag treatment facility in the waste melting treatment facility according to claim 1 or 2, wherein a partition wall having a water passage is provided in the vertical direction in the vicinity of the overflow port of the slag draining conveyor.   The plurality of partition walls are provided in parallel in the vertical direction, and water channels that meander in the vertical direction are formed by alternately arranging the water passages of the partition walls in the vertical direction. The slag processing facility in the waste melting processing facility according to any one of the above.   A detector that detects the liquid level of the slurry supply tank and draining conveyor, an arithmetic unit that monitors and sums each detected liquid level individually, and supplies a decrease in the total amount of slurry water in the system. A slag treatment facility in a waste melting treatment facility according to any one of claims 1 to 4, further comprising an on-off valve for industrial water.

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