KR20020046332A - Quicklime melting apparatus - Google Patents

Abstract

The present invention prevents the occurrence of dust during the hydrated lime melting operation, prevents the accumulation of hydrated lime in the hydrated lime dissolution tank, prevents the hydrated lime is fixed in the hydrated lime inlet and at the same time stable hydrated lime can be produced To provide a dissolution apparatus.

The slaked lime dissolving apparatus of the present invention is installed so as to be rotatably connected to the rotary shaft of the rotary motor fixed to the dissolution tank in communication with the bearing between the conveying conveyor, the end rod is fixed to the dissolution tank An inlet part in close contact with an inner surface of the inlet tube; A plurality of rotary rods are hinged to the rotary shaft of the drive motor, and the slide tube inserted into the rotary shaft is connected to the rotary rod and connected to the rod of the elevating cylinder installed in the dissolution tank. It includes a rotating unit is provided with a plurality of stirring blades.

Description

Quicklime melting apparatus

The present invention relates to a wastewater treatment plant, and more particularly, to a limestone dissolving apparatus for dissolving slaked lime used in the neutralization treatment of various wastewater generated in an ironworks by chemical method to produce a solution.

In general, many types of wastewater (acid wastewater, alkaline wastewater, oil wastewater and general wastewater) are produced in steel making in steel mills.

These wastewaters contain sulfuric acid, nitric acid, hydrofluoric acid, hydrochloric acid, and various heavy metals. To neutralize and precipitate these wastewaters, limestone solution is used. To control the input of slaked lime.

Such a lime solution is prepared by dissolving lime in water so as to have an appropriate amount of ph.

In Fig. 4, a conventional slaked lime dissolving device is shown in a perspective view.

The stirrer 4 is installed and operated at the top of the slaked lime dissolution tank 2 and the slaked lime solution is sent to the neutralization tank by the feed pump 6.

When the level sensor 8 detects a low level while supplying the slaked lime solution to the neutralization tank, the water supply automatic valve 10 opens to supply water to the slaked lime dissolution tank.

At the same time, the screw conveyor 12 for supplying the slaked lime is operated, and the powdered slaked lime stored in the slaked lime tank 14 is added to the slaked lime dissolution tank 2 for a time set to match the concentration of the slaked lime solution, and then the operation is stopped.

In this way, when the level sensor 8 detects a high level, the water supply automatic valve 10 closes and one cycle of a slaked lime dissolution operation is complete | finished.

However, as the level of the slaked lime solution increases during this operation, the air inside the slaked lime dissolution tank escapes into the gaps in the upper part of the slaked lime dissolved tank, and at the same time, the slaked lime dust is blown out together with the air into the atmosphere, thereby causing environmental pollution. Promotes corrosion

In addition, when the slaked lime reacts with water, the exothermic reaction causes water vapor. The steam also flows back into the screw conveyor as the level of the slaked lime solution increases, and the slaked lime adheres to the slaked lime inlet.

Accordingly, when the slaked lime inlet is blocked and the screw conveyor is operated, the slaked lime does not enter the slaked lime dissolution tank and is fixed in the screw conveyor, causing a load on the screw conveyor driving motor to cause a trip.

In this case, the operator opens the manhole on the top of the screw conveyor, removes the fixed slaked lime using a stick, and restarts the device. At this time, there is a high risk of a safety accident due to the malfunction of the screw conveyor.

In order to solve these problems, the object of the present invention is to prevent the generation of dust during the hydrated lime melting operation, to prevent the accumulation of hydrated lime in the hydrated lime melting tank, and to prevent the fixed lime in the hydrated lime inlet At the same time to provide a slaked lime dissolving device capable of stably preparing a slaked lime solution.

1 is a perspective view showing a partial cutaway of the slaked lime dissolving device according to the present invention.

Figure 2 is a perspective view showing the operation of the lifting cylinder according to the present invention.

3 is a plan view showing an installation state of the rotary blade according to the present invention.

Figure 4 is a perspective view showing a conventional slaked lime dissolving device.

<< Explanation of symbols for main part of drawing >>

QL ... lime lime tank SC ... feed conveyor

20 Melting tank 40

42 Bearing 44 Insertion tube

46 ... rotary motor 48 ... removal rod

60.Rotating part 62 ... Drive motor

64 ... rotating rod 70 ... slide tube

72 connection bar 74 lowering cylinder

76 ... connection rod 78a, 78b ... upper and lower detection sensors

80 ... Fixed bar 82 ... Sense bar

100 ... injection

Smelting lime dissolving apparatus of the present invention proposed to achieve the above object is installed in a rotatable connection with the rotating shaft of the rotary motor fixed to the dissolution tank is connected to the feed tube communicating with the conveying conveyor bearing. An input unit for closely contacting a removal rod fixed to the dissolution tank to an inner surface of the injection tube; A plurality of rotary rods are hinged to the rotary shaft of the drive motor, and the slide tube inserted into the rotary shaft is connected to the rotary rod and connected to the rod of the elevating cylinder installed in the dissolution tank. It includes a rotating unit is provided with a plurality of stirring blades.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a perspective view showing a partial cutaway of the slaked lime dissolving device according to the present invention.

As shown in FIG. 1, the apparatus for dissolving lime, according to the present invention, is a device for dissolving powder slaked lime stored in the lime lime tank into a dissolution tank using a conveying conveyor and dissolving water.

On the side of the dissolution tank 20 is a viewing window 22 and an internal inspection manhole 24 installed therein, and a discharge pipe 28 connected to the discharge pump 26 is installed at the lower side.

And the supply pipe 30 for supplying water is installed on the upper side of the dissolution tank 20, the control valve 30a is installed to adjust the amount of water supplied.

In addition, the level sensor 32 is installed on the upper ridge of the dissolution tank 20 to sense the surface height of the solution.

In addition, the dust collection case 34 is fixed to the upper edge of the dissolution tank 20, the nozzle is connected to the water pipe 36 for injection to the center of the dust collection case 34, the water pipe for injection ( 36, the automatic water supply valve 38 is installed to regulate the water supply.

Accordingly, it is possible to sink the dust generated when the lime is dissolved.

Dissolution tank 20 is an injection unit 40 for introducing the hydrated lime from the hydrated lime tank (QL) into the dissolution tank 20 in accordance with a feature of the present invention, and the rotating portion 60 to stir so that the injected hydrated lime and water are well mixed. ).

The inlet 40 is connected to the rotating shaft of the rotary motor 46 is fixed to the dissolution tank 20, the inlet pipe 44 communicates with the bearing 42 between the conveying conveyor (SC) to be rotatable. Is installed, one end of the removal rod 48 is fixed to the dissolution tank 20 is in close contact with the inner surface of the inlet pipe (44).

The conveying conveyor SC rotates the screw 52 provided in the inside of the conveying pipe 50 with the motor 54.

The injection pipe 44 is provided with an automatic valve for supplying slaked lime which is opened and closed in accordance with the operation of the motor 54, the outer motor of the injection pipe 44 is a rotary motor 46 fixed to the dissolution tank 20 It is engaged with the rotating shaft of the gear is rotated in accordance with the rotation of the rotary motor 46.

At this time, when the injection pipe 44 is rotated, the slaked lime fixed to the inner surface of the injection pipe 44 is removed by the removal rod 48.

The rotating unit 60 is stirred by the water and the slaked lime by the rotational force of the drive motor 62 is installed in the upper center of the dissolution tank (20).

At the end of the rotation shaft 62a of the drive motor 62, a hub 66 hinged to the plurality of rotation rods 64 is fixed, while a slide tube 70 supported by a spring 68 is attached to the rotation shaft 62a. Insert it.

And by connecting the slide tube 70 and the plurality of rotating rods 64 hinged by the connecting bar 72, the plurality of rotating rods 64 are also raised and lowered when the slide tube 70 is raised and lowered.

In addition, in order to raise and lower the slide tube 70, as shown in FIG. 2, the several lifting cylinder 74 is provided in the upper part of the melting tank 20, and the rod end of these several lifting cylinder 74 is carried out. Is connected to the slide tube (70) through a connecting rod (76).

In order to limit the upper limit and the lower limit during vertical movement of the connecting rod 76 by the elevating cylinder 74, the fixing bar 80 to which the upper limit sensor 78a and the lower limit sensor 78b are attached is dissolved in the tank 20. The inner side of the upper surface of the fixed and the detection bar 82 corresponding to the two detection sensors (78a, 78b) is fixed to the slide tube (70).

A plurality of stirring blades 64a are installed on the lower surface of the rotating rod 64 as described above, and as shown in FIG. 3, the stirring rods are inclined with respect to the rotating rod 64 to rotate the rotating rod 64. Agitation is better by allowing turbulence to form within the solution by 64a.

And in order to prevent the slaked lime is fixed to the inner circumference of the dissolution tank 20 during stirring is provided with an injection unit 100 for injecting air or steam from the dissolution tank 20.

The injection unit 100 is provided with a nozzle tube 102 having a plurality of nozzles attached along the lower circumference of the dissolution tank 20, the air supply pipe in a position opposite to the dissolution tank 20 in the nozzle tube 102 An air supply valve 104a and a steam supply valve 104b are installed in each of the pipes 104 and 106 to control the supply amount of air and steam.

In order to remotely control the slaked lime dissolving device as described above, a control panel 110 in which a timer 108 is installed is installed. The control panel 110 has an upper limit sensor 78a and a lower limit sensor 78b. , All motors 26, 46, 54, 62 and all valves 30a, 38, 44a, 104a, 104b are connected.

The slaked lime dissolving apparatus according to the present invention as described above has the following effects.

The control panel 110 operates the control valve 30a to supply water to the inside of the dissolution tank 20 through the supply pipe 30, and at the same time, the motor 54 and the automatic valve for calcined lime supply 44a operate. The slaked lime stored in the slaked lime tank QL is supplied into the dissolved tank 20.

At this time, in order to stir, the control panel 110 instructs the operation to rotate the drive motor 62 and at the same time operate the elevating cylinder 74 to raise the connecting rod (76).

Then, the connecting rod 76 is raised until the upper limit sensor 78a detects the detecting bar 82, and at this time, the connecting bar 72 connected to the slide tube 70 also moves upward, and the connecting bar ( The end of the rotary rod 64 connected to 72 is raised to the upper side, and the stirring is performed while rotating at the top of the dissolution tank 20 for the set time of the timer 108.

When the set time elapses, when the control panel 110 sends a return signal to the elevating cylinder 74, the elevating cylinder 74 returns, and the lower limit sensor 78b detects the sensing bar 82. Until the connecting rod 76 is lowered.

Accordingly, the connection bar 72 connected to the slide tube 70 is also lowered together, and the end of the rotary rod 64 is lowered to the lower side, followed by stirring at the bottom of the dissolution tank 20.

In this way, the slide tube 70 is stirred while repeating the lifting position.

After the stirring is properly performed, if the solution of the dissolution tank 20 is discharged to the neutralization tank by pumping the discharge pump 26, the level sensor 32 senses the low level, and the control valve 30a is opened to dissolve the tank 20. Replenish the water inside.

At the same time, the water supply automatic valve 38 of the water pipe 36 for injection of the injection unit 100 is opened in order to calm the slaked lime in the dust generated during stirring to spray water into the collection case 34.

In order to prevent the lime from sticking to the inner circumference of the dissolution tank 20, the air supply valve 104a is opened in the summer season and the steam supply valve 104b is opened in the winter season. And steam is injected.

At this time, the control panel 110 operates the automatic valve for calcined lime supply 44a and at the same time operates the rotary motor 46 so that the input pipe 44 is rotated. Subsequently, the motor 54 is operated to inject the slaked lime stored in the slaked lime tank QL into the dissolution tank 20 using the transfer conveyor SC.

The conveying conveyor SC is operated for a time set for adjusting the concentration of the lime lime solution, and at the same time, the motor 54 is also stopped to stop the limestone supply.

When the motor 54 stops, the automatic valve for calcined lime supply 44a is also closed in order to prevent water from flowing back to the conveying conveyor SC.

After that, when the level sensor 32 of the dissolution tank 20 detects a high level, the control valve 30a, the air supply valve 104a and the water supply automatic valve 38 of the dissolution tank 20 are closed to dissolve the slaked lime. This will end cycle one.

As described above, the welding machine according to the present invention substantially solves the conventional problems.

That is, when slaked lime is dissolved, slaked lime dust is prevented from being released into the atmosphere, thereby preventing environmental pollution.

And by installing the removal rod on the inside of the inlet pipe and by rotating the inlet pipe can be prevented that the slaked lime is fixed inside the inlet pipe.

In addition, by installing the injection portion can be prevented from being deposited due to the accumulation of lime on the inner bottom and side of the melting tank.

In addition, it is possible to supply the hydrated lime solution stably, thereby facilitating wastewater treatment to prevent water pollution and enable continuous on-site operation.

Claims (3)

In the apparatus for producing a hydrated lime solution by supplying the hydrated lime stored in the hydrated lime tank with water to the inside of the dissolution tank by using a transfer conveyor, stirring by the rotational force of the drive motor, An injection tube communicating with the conveying conveyor with a bearing is rotatably installed in contact with a rotary shaft of a rotary motor fixed to the dissolution tank, and has a removal rod having one end fixed to the dissolution tank in the input tube. An input unit in close contact with the side surface; A plurality of rotary rods are hinged to the rotary shaft of the drive motor, and the slide tube inserted into the rotary shaft is connected to the rotary rod and connected to the rod of the elevating cylinder installed in the dissolution tank. Calcined lime dissolving apparatus characterized in that it comprises a rotating portion is provided with a plurality of stirring blades. The apparatus of claim 1, further comprising a water supply pipe provided with a nozzle on an upper portion of the dissolution tank. The nozzle tube according to any one of claims 1 and 2, further comprising a nozzle tube having a plurality of nozzles attached to the inner lower periphery of the dissolution tank, the nozzle tube further communicating an air supply pipe and a steam supply pipe. Slaked lime dissolving apparatus, characterized in that.