JP5631071B2 - Pickling equipment - Google Patents

Description

  The present invention relates to pickling equipment.

  In order to remove the scale formed on the surface of the steel strip during the processing process, a continuous pickling facility is used in which the steel strip is immersed in an acidic chemical solution. For example, hydrochloric acid or sulfuric acid is used as the acidic chemical solution, and the acidic chemical solution has a high temperature of about 90 ° C. suitable for scale removal.

  Conventional pickling tanks that store acidic chemicals are laid on the inner surface of the iron-skin tank that forms the outer shape of the pickling tank, the lining material with heat resistance and acid resistance that covers the inner surface of the iron-skin tank, and the inner surface of the lining material. And bricks with heat resistance and acid resistance. The lining material prevents corrosion of the iron skin tank due to acidic chemicals. The brick blocks heat transferred from the acidic chemical solution to the lining material and the iron skin tank, and suppresses deformation and breakage of the lining material and the iron skin tank due to heat (for example, Patent Document 1).

Japanese Utility Model Publication No. 5-45071

  Acid fume such as hydrogen chloride and hydrogen sulfide is generated from the acidic chemical stored in the pickling tank. If acid fume leaks from the pickling tank, there is a high risk of corroding surrounding equipment. In addition, when a large amount of high-temperature acid fume leaks from the pickling tank, work near the pickling tank becomes difficult due to hot air. Therefore, in the past, acid fume was confined in the pickling tank by closing the gap between the pickling tanks as much as possible, or the pickling fume was stored in another building by storing the continuous pickling equipment and other equipment in another building. I try not to reach the facilities.

  However, even if the pickling tank is sealed, the pickling tank may be damaged due to deterioration over time, collision of the steel strip, and various other causes. When the pickling tank is damaged, the acidic chemical liquid leaked to the outside damages the peripheral equipment, or the acid fume generated from the acidic chemical liquid damages the peripheral equipment. As described above, when the acidic chemical solution leaks from the pickling tank, although the influence on the peripheral equipment is large, the confirmation of the leak is often delayed, and the influence on the peripheral equipment tends to be enormous. In particular, since the pickling tank is composed of an iron skin tank, a lining material, and bricks, it is difficult to grasp where the acid chemical solution leaks even if it leaks.

  An object of this invention is to provide the pickling equipment which can reduce the influence which it has on the peripheral equipment by the leakage of the acidic chemical | medical solution from a pickling tank.

  The first pickling equipment of the present invention is a pickling equipment for pickling a steel strip with an acidic chemical solution, stores the acidic chemical solution, and is made of an acid-resistant resin made of acid-resistant resin that expands and contracts by heat, and heat. In order to absorb expansion and contraction of the pickling tank, an expansion and absorption table having a support surface that slidably supports the pickling tank, and the expansion and absorption table discharges the fluid leaked from the pickling tank. It has a discharge port, and further includes a leak detection means for detecting a leak in the pickling tank by measuring the pH value of the fluid discharged from the discharge port.

  According to the first pickling facility of the present invention, since the acidic chemical solution is stored in the single-layer acid-resistant resin pickling tank, when the acidic chemical solution leaks from the pickling tank, the leakage is quickly confirmed. It becomes possible to do. By the way, as a pickling tank made of acid-resistant resin that expands and contracts by heat, for example, a pickling tank made of polypropylene corresponds. Therefore, in the first pickling facility of the present invention, in order to absorb the expansion and contraction of the pickling tank, an expansion / contraction absorption base having a support surface slidable with the pickling tank is provided. Furthermore, when the acidic chemical liquid leaks from the pickling tank, the leaked fluid can be received using this expansion / contraction absorption stand. The telescopic absorber has a discharge port for discharging fluid, and the leaked fluid is discharged from this discharge port. Since the pH value of the fluid discharged from the discharge port is automatically detected by the leakage detection means, it is possible to quickly detect leakage of the acidic chemical solution from the pickling tank. Also, in pickling equipment that employs a pickling tank made of polypropylene that easily expands and contracts by heat compared to brick and iron skin tanks, the pickling tank can be easily expanded and contracted by supporting the pickling tank by an expansion and contraction absorption stand. Therefore, the load applied to the pickling tank can be reduced as compared with the case where the pickling tank is fixed. Furthermore, since it is possible to detect the leakage of the pickling tank without processing the pickling tank by detecting the acidic chemical solution flowing out to the telescopic absorption base, there is a possibility that the pickling tank may be damaged by the leak detection means. It will disappear.

  The 2nd pickling equipment of the present invention is provided with a plurality of leak detection means in the 1st pickling equipment. Furthermore, the telescopic absorption base has a plurality of discharge ports so as to correspond to a plurality of leak detection means. Furthermore, the plurality of leakage detection means measure the pH value of the fluid discharged from different discharge ports.

  According to the second pickling facility of the present invention, it is possible to know in which discharge port a leak has occurred by referring to pH values detected by a plurality of leak detection means. That is, it becomes possible to quickly detect the leaked portion in the pickling tank.

  According to the pickling equipment of the present invention, it is possible to reduce the influence on peripheral equipment due to leakage of the acidic chemical liquid from the pickling tank.

FIG. 1 is a schematic configuration diagram of a continuous pickling facility according to an embodiment.

  Drawing 1 is a schematic structure figure of continuous pickling equipment 1 concerning one embodiment. As shown in FIG. 1, the continuous pickling facility 1 includes a pickling tank 10, a telescopic absorption base 11, a first discharge duct 12 a, a second discharge duct 12 b, a waste liquid pit 13, a first leak detection unit 14 a, The second leak detection unit 14 b and the operation chamber 15 are configured.

  The pickling tank 10 of this embodiment is formed in a substantially rectangular parallelepiped shape using polypropylene (PP) as a material. The pickling tank 10 is not formed by laminating bricks, lining materials, and iron skin tanks as in the prior art, but is formed by a single layer of polypropylene. Four wall portions 21 are erected substantially vertically from the four straight edge portions of the bottom portion 20 of the pickling tank 10. An opening 22 in the upper part of the pickling tank 10 surrounded by a rectangular shape by all upper ends of the four wall portions 21 is covered with a lid portion 23 so as to be opened and closed.

  When the steel strip is pickled, an acidic chemical solution is stored inside the pickling tank 10. When the steel strip moves in the acidic chemical solution, the scale formed on the surface of the steel strip in the processing process is removed. For example, hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid (hydrofluoric acid) is used as the acidic chemical solution, and the acidic chemical solution has a high temperature of about 90 ° C. suitable for scale removal. However, the temperature of the acidic chemical solution is preferably about 90 ° C., but it may be at least 70 ° C. or higher.

  The telescopic absorption base 11 is fixed to the ground, and has a support surface 30 formed substantially horizontally so as to face vertically upward. The support surface 30 can place the pickling tank 10, and when the acidic chemical liquid leaks from the pickling tank 10, the acid surface so that the leaked acidic chemical liquid can be received by the support surface 30. The bottom of the washing tub 10 is formed so as to cover the bottom 20 along the horizontal plane (that is, wider than the area of the bottom 20). Moreover, the flange which stands up upwards is formed in the edge part of the expansion-contraction absorption stand 11, Thereby, it can prevent that the acidic chemical | medical solution leaked from the pickling tank 10 flows out of the expansion-contraction absorption stand 11. . In addition, the pickling tank 10 slides on the support surface 30 when it expands and contracts by heat. Moreover, since the expansion / contraction absorption base 11 is comprised with acid-resistant resin (for example, polypropylene), even if an acidic chemical | medical solution leaks from the pickling tank 10, corrosion of the expansion / contraction absorption base 11 can be prevented.

  The telescopic absorption base 11 further has a first discharge port 31 a and a second discharge port 31 b opened on the support surface 30. When the acidic chemical liquid leaks from the pickling tank 10 and reaches the support surface 30, it flows out from the first discharge port 31a or the second discharge port 31b. The acidic chemical liquid flowing out from the first discharge port 31a is discharged to the waste liquid pit 13 through the first discharge duct 12a. The acidic chemical liquid flowing out from the second discharge port 31b is discharged to the waste liquid pit 13 through the second discharge duct 12b.

  A first leakage detection unit 14a is disposed in the middle of the first discharge duct 12a. The first leakage detection unit 14a includes a branch pipe 40 for diverting a part of the fluid from the pickling tank 10 toward the waste pit 13, a measurement tank 41 for temporarily storing the fluid diverted by the branch pipe 40, It comprises a pH meter 42 that measures the pH value of the fluid stored in the measuring tank 41. The pH value measured by the pH meter 42 is transmitted to the operation room 15. The fluid that has flowed into the measurement tank 41 is finally discharged to the waste liquid pit 13.

  The second leak detection unit 14b is structurally the same as the first leak detection unit 14a in that it includes a branch pipe 40, a measurement tank 41, and a pH meter 42. However, the first leak detection unit 14a detects the pH value of the fluid flowing through the first discharge duct 12a, whereas the second leak detection unit 14b is the pH of the fluid flowing through the second discharge duct 12b. Detect value.

  When the acidic chemical liquid leaks from the pickling tank 10 in the vicinity of the first discharge port 31a, the acidic chemical liquid flows into the first discharge duct 12a, and the pH value indicated by the pH meter 42 of the first leak detection unit 14a is acidic. It becomes equal to the pH value of the chemical solution. On the other hand, when the acidic chemical liquid leaks from the pickling tank 10 in the vicinity of the second discharge port 31b, the acidic chemical liquid flows into the second discharge duct 12b, and the pH value indicated by the pH meter 42 of the second leakage detection unit 14b. Becomes equal to the pH value of the acidic chemical solution.

  When the pH value of the acidic chemical solution is detected by the pH meter 42 of the first leak detection unit 14a, the control unit 50 of the operation chamber 15 operates the alarm device 51 to make it near the first discharge port 31a. It is notified that the acidic chemical liquid is leaking from the pickling tank 10. Further, when the pH value of the acidic chemical solution is detected by the pH meter 42 of the second leakage detection unit 14b, the control unit 50 operates the alarm device 51 to pickle the acid solution near the second discharge port 31b. It is notified that the acidic chemical liquid is leaking from the tank 10. Examples of the notification method by the alarm device 51 include lighting a lamp, displaying characters on an electric bulletin board, and voice from a speaker.

  FIG. 1 shows an example when a crack 60 occurs in the pickling tank 10. Since the crack 60 is closer to the second discharge port 31b than the first discharge port 31a, the acidic chemical liquid flowing out from the crack 60 flows from the support surface 30 to the second discharge port 31b. Further, the acidic chemical liquid flowing out from the crack 60 flows into the second leakage detection unit 14b through the second discharge duct 12b. Further, the control unit 50 is notified that the pH value of the acidic chemical solution has been detected by the pH meter 42 of the second leak detection unit 14b. The control unit 50 operates the alarm device 51 to notify that the acidic chemical liquid has leaked from the pickling tank 10 in the vicinity of the second discharge port 31b.

  In addition, the expansion / contraction absorption table 11 is not limited to the first discharge port 31a and the second discharge port 31b, but along the longitudinal direction of the expansion / contraction absorption table 11 (and thus the longitudinal direction of the pickling tank 10), A plurality of discharge ports may be formed regularly (for example, at substantially equal intervals).

  The continuous pickling facility 1 of the present embodiment relates to the continuous pickling facility 1 for pickling a steel strip with an acidic chemical solution of 70 ° C. or higher, and stores the acidic chemical solution, and the pickling tank 10 made of polypropylene that expands and contracts by heat, In order to absorb expansion and contraction of the pickling tank 10 due to heat, the expansion / contraction absorption base 11 having a support surface 30 that slidably supports the pickling tank is provided. And the expansion / contraction absorption base 11 receives the fluid leaked from the pickling tank 10 under the idea that the leakage of the acidic chemical solution from the pickling tank can be quickly confirmed by using the expansion / contraction absorption base 11. In addition to being arranged in a form that covers the bottom 20 of the pickling tank 10 below the pickling tank 10, the fluid leaked from the pickling tank 10 (drain containing acid chemical solution) is discharged. It has discharge ports 31a and 31b. And the leak of the acidic chemical | medical solution from the pickling tank 10 is detectable by measuring the pH value of the fluid discharged | emitted from this discharge port 31a, 31b by leak detection unit 14a, 14b. In this way, even if the acidic chemical liquid leaks from the pickling tank 10, it is possible to grasp the leakage of the acidic chemical liquid quickly and reliably as compared with the visual inspection by the operator.

  Furthermore, according to the continuous pickling facility 1 of the present embodiment, the first leak detection unit 14a detects the leak location of the pickling tank 10 in the vicinity of the first discharge port 31a, and the second leak detection unit 14b. By detecting the leak location of the pickling tank 10 in the vicinity of the second discharge port 31b, the leak location of the pickling tank 10 can be specified in detail. In particular, a plurality of discharge ports are regularly formed (for example, at substantially equal intervals) in the expansion / contraction absorption table 11 along the longitudinal direction of the expansion / contraction absorption table 11 (and thus the longitudinal direction of the pickling tank 10). You may enable it to specify the leak location of the pickling tank 10 in detail by comprising so that the acidic chemical | medical solution which flows in may be detected by a different leak detection unit.

  The present invention can be applied to various continuous pickling facilities without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Continuous pickling equipment 10 Pickling tank 11 Telescopic absorption stand 12a 1st discharge duct 12b 2nd discharge duct 13 Waste liquid pit 14a 1st leak detection unit 14b 2nd leak detection unit 15 Operation room 20 Bottom part 21 Wall part 22 Opening 23 Lid 30 Support surface 31a 1st discharge port 31b 2nd discharge port 40 Branch pipe 41 Measurement tank 42 pH meter 50 Control part 51 Alarm device 60 Crack

Claims (2)

Pickling equipment for pickling steel strips with acidic chemicals,
An acid-resistant resin pickling tank that stores the acidic chemical and expands and contracts by heat;
In order to absorb the expansion and contraction of the pickling tank due to heat, an expansion and contraction absorption base having a support surface that slidably supports the pickling tank;
With
The telescopic absorber has a discharge port for discharging a fluid,
further,
Pickling equipment provided with leak detection means for detecting leakage of the pickling tank by measuring the pH value of the fluid discharged from the discharge port. Together provided with a plurality of pre-Liver mode detecting means,
The expansion / contraction absorber has a plurality of the outlets so as to correspond to the plurality of leakage detection means,
The pickling facility according to claim 1, wherein the plurality of leakage detection units measure pH values of fluids discharged from different discharge ports.