KR890003818B1 - Alkaline bubble collector of an electro-cleaning process for a cold rolled sheets - Google Patents

Abstract

An alkaline bubble prevention tank (18) is set up at the lower berth of the discharging pipe (4) and a bubble discharging prevention box (23) is connected with a bubble collected gas discharging box (25) and a gas discharging blower (5). At the upper part of the other side, a gas outlet (20) of solution charging tank and a bubble inlet (37) are connected, so that the alkaline bubble can be inletted due to the inner pressure of the solution charging tank (3) and the gas blower (5). A liquefied bubble filtrating tank (34) is placed at the lower berth of this structure. And an oversupply valve is operated to the inner pressure. The alkaline bubble can be collected in the liquefied form by cooling.

Description

Alkaline Foam Recovery System for Cold Rolled Steel Electrolytic Cleaning Process

1 is a schematic diagram of a conventional alkaline washing solution circulation system.

Figure 2 is an illustration of an alkaline washing solution circulation system of the present invention.

3 is an enlarged view showing the main part of the present invention.

* Explanation of symbols for main parts of the drawings

18: alkali bubble discharge prevention tank 20: solution storage tank gas pipe

21: bubble recovery gas exhaust pipe 23: bubble rain prevention box

24: bubble liquefied recovery solution discharge pipe 25: cylindrical body

26: internal bubble blocking wall 27: support for the water supply and drain pipe

28: water spray nozzle 29: high pressure water spray nozzle

30: foam prevention exhaust nozzle 31: foam cooling panel

32: gas exhaust inlet portion 33: bubble exhaust prevention plate

34: bubble liquefied filter barrel 35: bubble liquefied recovery outlet

37: bubble inlet pipe 39: pressure-sensitive plate

41: cylinder 42: connection lever for pressure resistance

43: valve handle 44: supercharged water valve

45: supercharging plate 48: side opening

The present invention relates to an apparatus for recovering alkali bubbles generated in an electrolytic cleaning process for removing the rolled oil applied to the surface of a cold rolled steel sheet. In the conventional cold rolling, a jig is applied to the upper and lower surfaces of the cold rolled steel sheet which continuously passes the alkali cleaning solution having an appropriate concentration and temperature into the alkaline washing tank in order to effectively wash the rolled oil applied to the surface of the steel sheet during rolling. It is a process of rinsing by circulating spray on the brush roll which is contacted by the jack array and rotating at high speed, and washing it physically, and washing process that removes the rolling oil using electrolytic principle while passing cold rolled steel sheet into the electrolytic tank filled with alkaline solution. Washing with warm water and drying can be roughly classified. In particular, the first process generates a large amount of alkaline bubbles in the washing process by circulation spraying alkaline solution.

The large amount of alkaline bubbles generated in this way is collected in the alkaline solution storage tank together with the circulating alkali solution, and the alkali solution storage tank and the internal pressure are increased due to the bubble generation due to the temperature of the alkali solution itself and the gas generation. Alkaline bubbles are discharged to increase the pollution of the waste water, or the gas is discharged to the outside through the gas discharge pipe by the blower, causing the surrounding area of the building to be polluted.

In order to control the adverse effects caused by the generation of alkaline bubbles, a method of separately using an antifoaming agent is added to the alkaline cleaning solution, and the flow rate of the alkaline cleaning solution is reduced and controlled, and water is poured into the alkaline bubbles discharged through the upper limit of the storage tank or the gas discharge pipe. Wastewater hydration and the like have been used. In the former case, the aging phenomenon of the cleaning solution was high and the cost of using the cleaning solution was high. In the latter case, the cleaning effect was changed rapidly due to the change in the flow rate and concentration of the alkaline cleaning solution itself as a large amount of foam was discharged. There was a problem in maintaining the concentration.

The present invention eliminates such a conventional problem to recover and liquefy the bubbles generated in the cleaning circulation system by alkaline solution and then sent to the centrifuge to reuse to prevent the cleaning effect of the alkaline cleaning solution to change or lower rapidly. At the same time, the purpose of the present invention is to reduce the discharge of the cleaning solution by reducing the discharge of the cleaning solution and to reduce the pollution of the wastewater and the surrounding environment by reducing the discharge of the cleaning solution. When described in detail according to the drawings as follows.

In the present invention, in the cleaning circulation system with alkaline solution, the lower end of the solution storage upper limit discharge pipe (4) connected to the upper side of the alkaline solution storage tank (3) is locked in the life of the end of the pipe to enable the water level control The gas exhaust pipe (6) is installed in the bubble inlet pipe (37) on the foam inlet pipe (37) installed at the upper side of the cylindrical body (25) of the alkaline foam recovery device by installing an alkaline bubble discharge preventing tank (18). Foam liquid recovery pipe discharge tube 24 to the centrifuge solution ball gong 13 to the foam exhaust prevention box 23 formed with the foam exhaust prevention nozzle 30 and the foam exhaust prevention plate 33 disposed on the upper portion of the exhaust pipe 21. It is installed at the upper position of the alkaline solution reservoir (3) connected to each.

형 클램프(46)에 의해 체결된 상부개폐부(47)와 측면개폐부(48)가 있으며 이 측면 개폐부(48)의 하면에는 상하작동실린더(41)에 스프링(40)이 장착된 내압감지판(39)과 과급수방지판(45)이 각각설치되과 이 내압감지판(39)의 실린더(41) 하단과 과급수밸브(44)의 손잡이(43)사이에 연결레버(42)로 축착하여 연결된것이다.On the upper side of the cylindrical main body 25, the inlet portion of the gas exhaust pipe 21 where the bubbles are recovered is penetrated, and on the side

There is an upper opening and closing portion 47 and a side opening and closing portion 48 fastened by the type clamp 46, and the pressure-sensitive sensing plate 39 with a spring 40 mounted on the upper and lower operating cylinders 41 on the lower surface of the side opening and closing portion 48. ) And the supercharged water prevention plate 45 are respectively installed and connected between the lower end of the cylinder 41 and the handle 43 of the supercharged water valve 44 by the connection lever 42. .

형의 거품인입관(37)이 상부의 중앙부까지 관통연결설치되며 하부의 경사면 최하단에는 거품액와 회수용액배출구(35)가 원통형 본체(25)를 관통하여 용액수위초과배출구(36)가 형성된 거품액화 걸름통(34)과 연결되고, 거품액화 회수용액배출관(24)을 통해 원신분리기용액공급관(13)에 연장설치된 것이다.A foam barrier wall 26 formed of a plurality of gas exhaust holes 57 is mounted on the entire surface of the cylindrical body 25 and has a removable shape on the side.

Foam inlet pipe 37 is installed through the central portion of the upper through the foam in the bottom of the inclined surface of the foam liquid and the recovery solution discharge port 35 penetrates the cylindrical body 25 to form a liquid level excess outlet 36 formed It is connected to the strainer 34, and is installed in the centrifuge solution supply pipe 13 through the foam liquefaction recovery solution discharge pipe 24.

In addition, inside the foam block wall 26, the water spray nozzle frame 28 and the foam cooling panel 31 are fixed to the upper part in turn by the support 27, which serves as the water supply and drain pipe 56, and the water spray nozzle frame In the 28, several high-pressure water jet nozzles 29 having a circular array are installed so that water can be sprayed in a downward diagonal direction, and the foam cooling panel 31 has a copper tube in a circular plate shape, and the water supply connection part 49 and the drainage water. Connected to the connecting portion 50 is configured to allow the cooling water to flow into the inner tube. Reference numeral 5 is a gas exhaust brush, 7 is a centrifuge, and 14 is a centrifuge solution recovery tube.

The present invention configured as described above allows the lower end of the solution storage upper limit discharge pipe (4) of the alkaline solution storage tank (3) to be submerged in water and to install an alkaline foam discharge prevention tank (18) capable of adjusting the water level. Alkaline bubbles collected therein are bubble inlet pipes (37) connected to the solution storage tank gas exhaust pipe (20) connected vertically due to the influence of the internal pressure in the solution storage tank (3) and the gas exhaust blower (5) due to the solution temperature. After passing through), it enters the upper center in the inner foam blocking wall 26 and stays on the foam cooling panel 31. As the cooling is performed, the bubble surface of the foam is partially destroyed by cooling and liquefied. The foam is liquefied by crushing or diluting the bubbles of the foam by very small droplets sprayed from the high pressure water spray nozzle 29 of the nozzle frame 28 and overflowing to the edge. The foam is liquefied by the repetition of the same action as that caused by the high pressure water spray nozzle 29 and the foam cooling plate 31 located in the lower part of the back and gathered on the bottom of the cylindrical body 25 to form the foam liquid recovery liquid outlet 35 and the foam. The solution filtered by the centrifuge (7) through the liquefied filter barrel (34) and the foam liquid recovery liquid discharge tube (24) is sent back to the alkaline solution storage tank (3) through the centrifuge solution recovery tube (14) to the alkaline cleaning liquid. It is used continuously.

At this time, the gas separated by bubbles of bubbles is passed through the gas exhaust hole 57 of the internal bubble blocking wall, and the gas is discharged through the gas exhaust inlet part 33, the foam recovery gas exhaust pipe 21, and the foam exhaust prevention box 23. When the generation of bubbles temporarily increases, the internal pressure inside the apparatus increases, so that the pressure sensing plate 39 presses downward, and this force is connected to the connecting lever 42. By opening the supercharged water valve 44 connected by), a large amount of water is temporarily ejected through the supercharged water outlet 56 to collect a large amount of bubbles to liquefy, and the internal pressure is reduced and recovered due to the liquid liquefaction of the foam. The sensing plate 39 is lifted by the elasticity of the pressure-sensing plate support spring 40 mounted outside the vertically actuated cylinder 41 to block the supercharged water valve 44 and the supply of supercharged water is stopped to return to its original state. Being The.

In addition, when the solution level in the apparatus is rapidly increased, a large amount in the alkaline cleaning solution is prevented by the lowering operation of the pressure-sensitive sensing plate 39 by interference due to the buoyancy of the water level of the supercharge water preventing plate 45. To prevent the dilution of water and the excessively generated solution in the device is discharged to the outside through the solution level excess outlet 36 due to the high water level to prevent the rapid concentration change of the alkaline cleaning solution.

In the determination and adjustment of the amount of water-disperse stone in water for the destruction of bubbles in the apparatus of the present invention, the solution is consumed by being continuously buried in the amount of water evaporated and the surface of the steel sheet being washed, depending on the temperature of the liquid solution. It is based on the decrease in the amount of supplement, and the supplementary dosage of the cleaning agent and the quantity for the increase and decrease of the total washing solution and the maintenance of the proper concentration can be controlled within a smaller range than before.

As described above, the present invention enables the generated alkaline bubbles to be liquefied and reused by water spray dilution and cooling, thereby reducing the replenishment amount of the cleaning agent. As a result, the cleaning effect is uniformly improved, and the cost of using the cleaning solution and waste water treatment is reduced by recovering and reusing the alkaline bubbles discharged from the inside and the outside, and it is also effective in preventing the environmental pollution caused by the discharge of the alkaline bubbles.

Claims (1)

An alkaline bubble preventing water tank (18) is installed at the lower end of the upper end of the solution storage upper discharge pipe (4), and an antifoaming box is provided with an antifoaming plate 33 and an antifoaming nozzle 30 on one side of the cylindrical body 25. 23 is connected to the bubble recovery gas exhaust pipe 21 and the gas exhaust blower (5), the other side is connected to the solution storage tank gas exhaust pipe 20 and the bubble inlet pipe (37) in the solution storage tank (3) It is installed so that alkali bubbles are introduced into the device under the influence of the internal pressure and the gas exhaust blower (5), and the bubble liquefied filter barrel (34) having a solution level exceeding outlet (36) formed at the bottom thereof is connected to the foam liquid recovery outlet (35). The liquefied recovery solution discharge pipe 24 is installed in the centrifuge solution supply pipe 13, and the side opening / closing part 48 is provided between the supercharged water valve handle 43 at the lower end of the cylinder 41 of the pressure-sensing plate 39, which is operated. Is connected by the contact lever 42 to the pressure The high pressure water spray nozzle 29 is installed on the support 27 which serves as the water supply and drain pipe 56 in the bubble blocking wall 26 in which the water valve 44 is configured to be opened and closed and operated. An alkaline foam recovery device, characterized in that the water spray nozzle frame (28) and the foam cooling panel (31) are arranged in sequence to liquefy and recover the alkaline foam by cooling and water spraying.

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