JP6299346B2 - Rotating sintered ore cooling device with water seal type sealing device - Google Patents

Description

  The present invention relates to a sintered ore cooling device, and more particularly, in a rotary sintered ore cooling device having a water seal type sealing device, enabling stable operation by suppressing dust intrusion into the water ring type seal device. The present invention relates to a rotary sinter cooling device.

  Sinter is used in the blast furnace. Sinter ore is manufactured by refining and agglomerating raw iron ore powder ore, sintering it with a sintering machine, and then cooling it to a temperature at which it can be handled with a sinter cooler. The sinter discharged from the sintering machine generally has a sensible heat of 500 ° C. to 700 ° C., and is cooled to 150 ° C. to 100 ° C. or lower by a sinter cooler. Since the sensible heat discarded during cooling is enormous, in the sinter ore cooling device, exhaust heat is recovered from the cooling gas that exchanges heat with the sinter ore. As a sintered ore cooling device capable of recovering exhaust heat, a rotary sintered ore cooling device is known (see, for example, Patent Documents 1 to 3).

  The rotary sinter cooler is a doughnut-shaped circular chiller with a hopper with a cross-sectional shape that is inverted in trapezoid, and the hot sinter discharged from the sinter is continuously passed through a chute. The cooling air is supplied from above the hopper, and the cooling air is sucked or supplied from the lower part of the hopper while rotating the cooling device. After the cooling air supplied into the hopper exchanges heat with the sintered ore in the hopper, it passes through the hood at the top of the hopper and is sent to a dust remover and a heat recovery boiler for heat recovery. The cooled ore is inserted into a scraper that continuously scrapes out the sintered ore at the lower part of the hopper, so that the sintered ore flows out along the scraper and is discharged onto the belt conveyor.

  A water seal type sealing device having a water seal plate (fixed plate) and a sliding contact seal plate (movable plate) for sealing between the rotating hopper and the upper fixed hood with a water seal is provided. Air leakage into the apparatus is eliminated, and as a result, cooling with a small air volume is possible.

  However, in the rotary sinter ore cooling device, the cooling gas (cooling air) that has passed through the sinter in the hopper contains sinter ore dust, and this dust is water-sealed seal device. The problem of depositing in the water of the inside arises.

  Dust (dust) accumulates in the water in the water seal type seal device, and if the amount increases, the movement of the sliding seal plate of the water seal type seal device will be hindered by friction, hindering the rotation of the cooling device (cooler) Trip) will occur. In addition, dust entering the tank accumulates at the bottom of the tank and overflows from the tank, but since the dust component is calcium and dissolves in the water, if it overflows from the tank, The calcium component and the like are gradually hardened to form a solid lump deposit, and the apparatus may be worn and eventually damaged.

  Therefore, in the operation of the rotary sinter cooling device, if dust accumulates in the water seal type sealing device, the operation of the cooling device must be stopped and the dust removed to remove the accumulated dust. There is a problem that the work efficiency is lowered and the stable operation cannot be performed.

JP 2008-232519 A JP 2000-310489 A JP-A-6-257955

  The present invention has been made in view of the above problems, and suppresses dust accumulation in the water seal type seal device of the rotary sinter cooling device having the water seal type seal device, and prevents cooler trip and equipment wear damage. It is an object of the present invention to provide a rotary sinter cooling device having a water seal type sealing device.

  The present inventor has intensively studied to solve the above problems. As a result, with regard to dust accumulated in the water seal type sealing device, it is fundamental to prevent dust from accumulating in the water seal type sealing device rather than discharging the dust accumulated in the water ring type sealing device. The idea is to provide a sealing device between both partition plates of a water seal type sealing device having a structure of a movable side partition plate (sliding contact seal plate) and a fixed side partition plate (water seal seal plate). As a result, it was found that the accumulation of dust from the cooling gas in the water-sealed sealing device can be suppressed, and the present invention has been completed.

  The gist of the present invention is as follows.

(1) A rotary sinter cooling device having a water-sealed sealing device having a water-sealed box provided with a movable-side partition plate and a fixed-side partition plate, further inside than the inner movable-side partition plate A fixed-side partition plate , having a shape flexibility for sealing between the movable-side partition plate and the fixed-side partition plate of the water-sealed box from the sintered ore cooling gas, and made of stainless steel . A rotary sinter cooling device having a water seal type sealing device, characterized in that a seal member, which is a wire plate seal , is provided above the movable partition plate on the passage side of the sintered ore cooling gas.

( 2 ) A circulating water purification apparatus comprising a drainage system apparatus that drains dust accumulated in a water-sealed box together with water, a precipitation tank that purifies wastewater, and a water supply system apparatus that supplies purified water into the water-sealed box. A rotary sinter cooling device having the water seal type sealing device according to (1 ) above, wherein the cooling sinter cooling device is provided.

  According to the present invention, the accumulation of dust on the water-sealed sealing device is suppressed, so that the operation stop of the rotary sinter cooling device due to the cooler trip and the equipment wear damage is eliminated, and the sintering operation rate and productivity are improved. While improving, the maintenance load was reduced. By using a heat- and corrosion-resistant seal member (for example, a wire plate seal) having shape flexibility for sealing between the movable part and the fixed part, it was possible to avoid thermal wear and thermal deformation of the seal member. As a further dust suppression measure, a circulating water purification device equipped with a plurality of sedimentation tanks was installed, which prevented the drainage system from being clogged with the pump.

  Therefore, in the present invention, the sealing performance from the cooling gas, which is the greatest feature of the rotary sinter cooling device provided with the water seal type seal device, is maintained, and the water seal type seal device is affected by wear and aging. The rotary sinter cooling device has become a facility that can withstand harsh operating environments.

It is a figure which shows the outline | summary of the rotary sinter cooling device of the conventional sintered ore. It is a figure which shows the outline | summary of the water seal type sealing device provided in the rotary sinter cooling device of the conventional sintered ore. It is a figure which shows the outline | summary of the water seal type | mold sealing apparatus provided in the rotary sinter cooling device of the sintered ore of this invention. It is a figure which shows a wire plate seal, (a) is sectional drawing of a longitudinal direction, (b) is sectional drawing of the width direction. It is a figure which shows the outline | summary of the circulation type water purification apparatus which removes the dust in waste_water | drain.

  Hereinafter, the present invention will be described in detail.

  First, an outline of a rotary sinter cooling device for sintered ore will be described. A rotary sinter cooling device for sintered ore (hereinafter sometimes simply referred to as “sinter ore cooling device”) is known, for example, as disclosed in Patent Documents 1 to 3, and the sintering shown in FIG. The outline of the rotary sinter cooling apparatus for ore and the outline of the water seal type sealing apparatus shown in FIG. 2 will be described. There are two types of rotary sinter cooling devices: a cooling air induction type as shown in Patent Document 1 and a cooling air push-in type as shown in Patent Documents 2 and 3. Although the ore cooling device will be described as an example, the structure of the water seal type sealing device, the problem, and the solution to the problem are the same in the indentation type sintered ore cooling device.

  The sintered ore cooling apparatus 1 includes a circular rotary table 2 and an annular hopper 4 that is installed on the periphery of the table and has a space with an inverted trapezoidal cross section for depositing the sintered ore 3. The hot sintered ore discharged from the ore sintering machine is continuously supplied to the upper part of the cooling hopper via the cooling machine inlet chute 5.

  An annular hood 6 is provided at the top of the hopper 4 so as to cover the top of the hopper 4, and an exhaust gas duct is connected to the hood 6 so as to communicate with the hood 6. By sucking air in the hood 6 with a suction fan, the external air taken in is passed through the sintered ore 3 in the hopper 4 to cool the sintered ore 3.

  The sinter continuously supplied to the upper part of the hopper is inserted into the scraper 7 for continuously scraping the cooled sinter after being cooled. Heat is exchanged with the gas to descend while being cooled, and finally scraped off by the scraper 7 and discharged onto the belt conveyor.

  When cooling air that exchanges heat with sintered ore is sucked into the sintered ore cooling apparatus 1, it is necessary to prevent air leakage from the outside. For this reason, a water seal type sealing device 8 for sealing between the upper portion of the hopper 4 and the hood 6 is provided.

  FIG. 2 is a view showing an outline of the water seal type sealing device. As shown in FIG. 2, the water-sealed sealing device 8 has a water-sealed box (groove) 11 constituted by a movable partition plate 10 along the entire circumference on a plate 9 at the upper peripheral edge of the hopper 4. is set up. A predetermined amount of water 14 is always supplied to the box by a water supply pipe 12 and a drain pipe 13. A water partition sealing plate (fixed side partition plate) 15 is provided at the lower portion of the hood so as to sink into the water 14 in the water sealed box 10. In other words, the space between the upper portion of the hopper 4 and the hood 6 can be sealed with the water 14 by sinking the sealing plate (fixed side partition plate) 15 in the water 14 of the water seal box (groove portion) 11. The water-sealed box (movable side partition plate) can also be rotated and moved in accordance with the rotational movement of the hopper.

  However, the inventor found that the cooling gas that passed through the sinter in the hopper contained dust from the sinter, and if this dust accumulates in the water in the water-sealed seal device, it is movable. The movement of the side partition plate 10 is hindered by friction with the accumulated dust, which causes a trouble in the rotation of the cooling device (cooler trip), and causes problems such as equipment wear damage due to dust accumulation. As a result, the present inventors have studied a water-sealed sealing device that can suppress dust accumulation in the water-sealed box (groove) 11.

  First, the present inventor investigated the cause of dust accumulation in the water-sealed box (groove) 11 by analyzing the dust flow in the cooling gas (cooling air) flowing through the cooling device by numerical flow analysis. As a result, an attempt was made to install a baffle plate to prevent dust from flowing into the water-sealed seal device, but it was thermally deformed and worn, although it had the effect of suppressing the inflow of dust into the water-sealed seal device. It was still insufficient. Therefore, in the sintered ore cooling device, the space between the fixed and movable partition plates of the water seal type sealing device having the structure of the movable side partition plate and the fixed side partition plate is sealed, and the fixed side is used as the seal. When a sealing member provided with a brush having shape flexibility was provided on the upper part of the partition plate, it was found that dust inflow into the water seal type sealing device can be effectively suppressed.

  FIG. 3 is a view showing a water seal type sealing device according to the present invention in which a seal member provided with a brush having shape flexibility is provided between a movable side partition plate and a fixed side partition plate of the water seal type sealing device. is there.

  As shown in FIG. 3, the water seal type sealing device 8 according to the present invention is provided with a water seal box (groove portion) 11 along the entire circumference on the plate of the upper peripheral portion of the hopper 4. The box 11 has a movable side partition plate and a fixed side partition plate, and a predetermined amount of water 14 is always supplied by a water supply pipe 12 and a drain pipe 13. The fixed-side partition plate 15 has a structure that is provided below the hood 6 so as to sink into the water 14 of the box 11. Such a structure itself is the same as the structure of the conventional water seal type sealing device shown in FIG.

In CAES sealing apparatus of the present invention, the seal at the top of the movable partition plate 10 of the water seal box and a fixed side partition plate 15 and the movable-side partition plate 10 (shown as B ₂ in FIG. 3) A wire plate seal (referred to as a wiper seal) 16 is provided as a member to seal between the movable side partition plate 10 and the fixed side partition plate 15 so that cooling gas with dust does not flow into the water seal box. I made it. It is effective to provide the seal member so as to partition the upper part of the movable side partition plate and the hood (the horizontal part of the fixed side partition plate), but the movable side partition plate also moves according to the rotation of the cooling device. To do. Therefore, the seal member installed on the upper part of the movable partition plate slides with the lower part of the horizontal part of the fixed partition plate. For this reason, as a sealing member, it is necessary to make it the member which has the shape flexibility which is not thermally deformed but has abrasion resistance. In the present invention, it is preferable to use a wire plate seal as the sealing member having shape flexibility.

  4A and 4B are diagrams showing a wire plate seal, in which FIG. 4A is a longitudinal sectional view and FIG. 4B is a widthwise sectional view. In the wire plate seal 16, a wire brush portion 17 made of a large number of metal wires extending toward the lower part of the fixed side partition plate and a metal sheet 18 inserted in the center in the width direction of the wire brush portion 17 are fixed to the base portion 19. The base 19 is fixed to the upper part of the movable partition plate 10. As the material of the metal wire and the metal sheet, steel having heat resistance and corrosion resistance can be used, and stainless steel (stainless wire, stainless sheet) is particularly preferable.

  By using such a wire plate seal, even if the movable side partition plate moves according to the rotation of the cooling device, the wire brush part and the metal sheet bend, respectively, and slide with the lower part of the hood to move the upper part of the movable side partition plate. It is possible to prevent a gap from being formed between the lower part and the lower part of the fixed side partition plate. The height of the wire plate seal is preferably 100 to 150 mm, although it depends on the size of the cooling device.

  Therefore, by providing the wire plate seal, it is possible to prevent the cooling gas containing dust in the cooling device from entering between the movable side partition plate and the fixed side partition plate. That is, it is possible to suppress the accumulation of dust in the water seal box of the water seal type sealing device.

  In addition, the shape-flexible sealing member may be a sealing member in which only a metal wire is erected and a narrow metal thin plate is erected in place of a wire brush shape or metal wire.

  By suppressing the accumulation of dust in the water in the water seal type sealing device, the movement of the movable side partition plate is smooth, and there is no trouble (cooler trip) in the rotation of the cooling device. Also, equipment wear damage due to dust accumulation can be prevented. For this reason, it is not necessary to stop the operation of the cooling device in order to remove dust accumulated in the water-sealed box.

  Further, since it is impossible to completely prevent dust from accumulating in the water-sealed box of the water-sealed sealing device, it is necessary to remove the dust accumulated in the water-sealed box. As shown in FIG. 2, a water supply pipe 12 and a drain pipe 13 are installed in the water seal box, and water is supplied to the water seal box 11 through the water pipe 12 and drained through the drain pipe 13. Since dust accumulated in the water-sealed box is sucked during drainage, the dust accumulated in the water-sealed box can be discharged. The water supply to the water seal box is preferably used by circulating the water drained from the drain pipe. However, since the wastewater contains dust, it is necessary to supply water from which the dust in the wastewater has been removed. In the present invention, a water purification device having a plurality of dust separation tanks is provided so that purified water from which dust has been removed is returned to the water sealing device.

  FIG. 5 is a diagram showing an outline of a circulating water purification apparatus for removing dust in waste water.

  In the circulating water purification apparatus of the present invention, as shown in FIG. 5, the water in the water-sealed box 11 is drained into the sedimentation tank 21 by the drainage pump 20 together with the dust accumulated in the water. In the settling tank 21, a plurality of dust settling tanks 21 are provided for precipitating dust (sludge) and separating the dust and the supernatant water. A plurality of dust settling tanks are used in order to slow down the flow rate of the drainage and to reliably precipitate and separate the dust in the drainage. It is preferable to arrange 3 to 6 tanks as the dust settling tanks. Since the specific gravity of dust is heavy, in the process where wastewater containing dust flows toward the downstream side, dust settles and can be easily removed to purify the water. The purified water is supplied from the final sedimentation tank to the water seal box 11 through the water supply pipe 12 by the water supply pump 22. In the first settling tank 21, a weir 23 is provided in the center so as to remove floating substances (scum) floating in water.

  Next, the effects of the present invention will be specifically described.

  In the rotary sinter cooling device shown in FIG. 3, using the sealing device in the shape of three kinds of sealing devices of A1: steel sheet, A2: L-shaped steel sheet and A3: wire plate seal, the installation position of the sealing device As shown in the figure, B1: a sealing device is installed at the position of the inner fixed side partition plate lower part (shown in FIG. 3), B2: the movable side partition plate upper part (shown in FIG. 3), and a rotary sinter cooling device We investigated the dust accumulation state, the failure frequency of the rotary sinter cooler and the maintainability by cooling the sinter. The results are shown in Table 1.

  In Table 1, the material of the sealing device was C1: stainless steel (SUS304), C2: general steel material (SS400). In the drainage system, D1: single, D2: a plurality of precipitation tanks were used.

  Evaluation of dust accumulation state as a test result is as follows: ○: Dust accumulation is hardly observed (less than 10 cm), Δ: Dust is considerably accumulated in the water tank (10 cm or more), ×: Dust is accumulated so that the dust overflows from the water tank showed that. As the evaluation of the frequency of the cooler failure due to dust, the evaluation was as follows: ○: almost none (less than once a year), Δ: rarely (less than 5 times a year), x: frequent (more than 5 times a year). Moreover, as evaluation of maintenance property, it evaluated as (circle): repair frequency is low (less than once a year), (triangle | delta): during repair frequency (less than 3 times a year), x: repair frequency is high (more than 3 times a year).

  As shown in Table 1, in the rotary sinter cooling device of the present invention example (Z7), dust accumulation in the water in the water seal type sealing device is well suppressed, and there is no hindrance to rotation of the cooling device and maintenance. The property was also good.

  On the other hand, the comparative examples (Z1, Z2, Z4, Z5) in which a seal is provided at the lower part of the fixed partition plate are not preferable because maintenance is frequently required due to thermal deformation, wear, and dropout of the seal device. Further, in the comparative example (Z6) using the general steel material, the dust was accumulated so that the dust overflowed from the water tank due to the corrosion / deformation of the sealing device, the failure frequency was frequent, and the maintainability was inferior. Further, the comparative example (Z3) using the steel sheet did not have a sufficient dust accumulation suppressing effect.

  As described above, according to the present invention, dust accumulation on the seal device is suppressed, the failure frequency of the rotary sinter cooler due to cooler trip and equipment wear damage is reduced, and the maintenance load is reduced. For this reason, the operation stop of the rotary sinter cooling device is eliminated, and the sintering operation rate and productivity can be improved.

DESCRIPTION OF SYMBOLS 1 Sinter ore cooling device 2 Rotary table 3 Sinter ore 4 Hopper 5 Chute 6 Annular hood 7 Scraper 8 Water seal type seal device 9 Hopper upper part 10 Movable side partition plate 11 Water seal box 12 Water supply pipe 13 Drain pipe 14 Water 15 Fixed side partition plate 16 Wire plate seal 17 Metal wire brush 18 Metal sheet 19 Base of wire plate seal 20 Drain pump 21 Sedimentation tank 22 Water supply pump 23 Weir

Claims (2)

A rotary sinter cooling device having a water-sealed sealing device having a water-sealed box provided with a movable-side partition plate and a fixed-side partition plate, further inside the movable-side partition plate on the inner side, the fixed side A partition plate is further provided, having a shape flexibility for sealing between the movable side partition plate and the fixed side partition plate of the water-sealed box from the cooling gas of the sintered ore, and the material is stainless steel , A rotary sinter cooling device having a water seal type sealing device, wherein a seal member, which is a plate seal , is provided on an upper part of a movable partition plate on the cooling gas passage side of the sinter. A circulating water purification device is provided with a drainage system that drains the dust accumulated in the water-sealed box together with water, a settling tank that purifies the drainage, and a water supply system that supplies purified water into the water-sealed box. The rotary sinter cooling device having the water seal type sealing device according to claim 1 .

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