JPH0683766U - Continuous pickling tank - Google Patents

Abstract

(57) [Summary] [Purpose] The acid solution generated by dew condensation in the fume suction duct of the pickling tank is quickly removed, and the acid solution pool is not generated. [Structure] A fume suction duct 1 having a circular cross-section is separated from the pickling tank 3 and arranged above it. The bottom 2a of the fume suction duct 1 and the pickling tank 3 are connected by a pipe 2. [Effect] It is possible to prevent the generation of the acid solution in the fume suction duct and suppress the deterioration of the fume suction duct. It is possible to prevent acid solution leakage starting from the acid solution pool in the fume suction duct, and realize stable operation of the pickling tank equipment.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a continuous pickling tank in which oxides generated on the surface of a metal strip are continuously washed with a heated acidic aqueous solution.

[0002]

[Prior art]

 The pickling tank is generally used by heating the acidic aqueous solution to 80 to 90 ° C. for the purpose of improving the cleaning ability. In this case, fumes are generated from the heated acidic aqueous solution. The fume is also acidic, and if it leaks to a place other than the pickling tank, it will cause problems such as environmental degradation and rust on peripheral equipment and devices. Therefore, fume suction and post-treatment equipment are required.

[0003]

[Problems to be solved by the device]

 The problems of the conventional pickling tank structure will be described with reference to FIG.

In the conventional pickling tank, the fume suction duct 5 for sucking generated fumes and the pickling tank 3 are integrated and have a rectangular structure, and the side wall 5a of the fume suction duct 5 on the pickling tank side is provided. Fume is sucked by making holes 5b with an appropriate pitch in the. When the fume is sucked by the fume suction duct 5, the fume contacts the side wall 5a and dew so that it is liquefied, and an acid solution pool 6 is generated inside the fume suction duct 5. Generally, the condensed liquefied acid solution is condensed and has a higher concentration than the acid concentration of the acidic aqueous solution 4 before evaporation, and the generated acid solution pool 6 is used to ensure the acid resistance of the fume suction duct 5. By promoting the deterioration of the mulling, corrosion and perforation are generated in the iron shell that constitutes the fume suction duct 5, and finally the acid liquid leaks to the outside of the pickling tank 3 (B in the figure). It was provoking.

As a conventional fume suction processing device, a device shown in Japanese Utility Model Laid-Open No. 59-93718 is known, but no mention is made of elimination of acid solution pool inside the duct.

The present invention realizes stabilization of the pickling tank facility by preventing the generation of an acid liquid pool in the duct, suppressing the progress of deterioration of the duct.

[0007]

[Means for Solving the Problems]

 The gist of the present invention is that a fume suction duct having a circular cross-sectional shape is provided above the pickling tank separately from the pickling tank, and the bottom of the fume suction duct and the pickling tank are connected by piping. It is a characteristic continuous pickling tank.

[0008]

[Action]

 In the pickling tank of the present invention, the fume suction duct which is separated from the pickling tank and is arranged above the pickling tank has a circular cross section, and the pipe communicating with the pickling tank exists at the bottom. When fume is condensed in the duct and liquefied, the acid solution flows into the pickling tank by its own weight and does not generate an acid solution pool.

[0009]

【Example】

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

As shown in FIG. 1, the fume suction duct 1 is disposed above the pickling tank 3 as a structure separated from the pickling tank 3, and its cross-sectional shape is circular. At the bottom 1a of the fume suction duct 1, a pipe 2 communicating with the pickling tank 3 is provided.

The material of the fume suction duct 1 is not particularly limited, but a resin such as FRP is preferable in consideration of maintaining durability against acid fumes.

In the example shown in FIG. 1, the fume generated from the acidic aqueous solution 4 in the pickling tank 3 is sucked into the fume suction duct 1 through the pipe 2 and comes into contact with the wall surface of the fume suction duct 1 to condense and liquefy. The liquefied acid solution immediately passes through the pipe 2 by its own weight and flows down to the pickling tank 3 (A in the figure), so that no acid solution pool is generated inside the fume suction duct 1.

[0013]

[Effect of device]

 According to the present invention, it is possible to prevent the acid liquid pool from being generated in the fume suction duct and suppress the deterioration of the fume suction duct. Further, it is possible to prevent the acid liquid from leaking from the acid liquid pool in the fume suction duct, and the stable operation of the pickling tank facility is realized.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a pickling tank according to the present invention.

FIG. 2 is a sectional view showing a conventional pickling tank.

[Explanation of Codes] 1 Fume suction duct 1a Bottom part 2 Piping 3 Pickling tank 4 Acidic aqueous solution 5 Fume suction duct 5a Side wall 5b Hole 6 Acid reservoir

Claims (1)

[Scope of utility model registration request] 1. A fume suction duct having a circular cross section is separated from the pickling tank and arranged above the pickling tank, and the bottom of the fume suction duct and the pickling tank are connected by a pipe. Continuous pickling tank.