JPH0841665A - How to prevent heat radiation from the bath surface of a high-temperature liquid tank - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent heat dissipation and mist scattering from the chemical liquid without being taken out of the tank and without hindering charging and extracting. [Structure] In a method of preventing heat radiation from the bath surface of a high temperature liquid tank 1 in which a chemical solution treatment or a hot water washing process is performed, the entire bath surface of the high temperature liquid tank 1 is covered with a rod-shaped float 4. [Effect] It is possible to greatly contribute to cost reduction by energy saving and prevent deterioration of working environment due to mist scattering when using harmful chemicals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing heat radiation from a bath surface of a high temperature liquid tank, which is subjected to chemical solution treatment such as pickling treatment, alkali treatment or hot water washing treatment.

[0002]

2. Description of the Related Art Conventionally, when performing chemical cleaning or warm water cleaning at a relatively high temperature, heat loss from high temperature chemicals or hot water, particularly energy loss due to latent heat of vaporization, has been a serious problem. For example, in the pickling, degreasing or rust-prevention process of a pipe manufacturing plant, the pipe material is immersed in a chemical solution kept at a temperature of about 70 to 100 ° C. to be treated, but at this time, heat radiation from the chemical solution, that is, energy loss does not occur. It was a huge and serious problem. Further, when the chemical liquid is a harmful substance, mist scattering is also a serious problem in the working environment.

As a method of preventing heat radiation from the bath surface of the high temperature liquid tank as described above, conventionally, as shown in FIG. 2, a synthetic resin sphere 23 is suspended on the surface of the processing liquid 22 of the processing tank 21 to form the processing liquid 22. Insulation of heat insulation and a method to prevent mist scattering, Fig. 3
As shown in, the flexible lid 32 of the treatment tank 31 is
The lid 32 is suspended and supported by a plurality of wire ropes 33 that are integrally arranged in the longitudinal direction of the upper surface of the lid 32. Both ends of each wire rope 33 are integrally coupled to guide rollers running on the guide rails of the gantry so that the treatment tank 31 has a A system in which a lid 32 is provided so as to be movable along the outer surface of the tank to prevent mist scattering (Japanese Patent Publication No. 52-19).
No. 171), a system in which a foaming additive is added to a chemical liquid to form bubbles on the bath surface to suppress mist scattering is implemented.

In the system shown in FIG. 2, the spheres are taken out of the bath with the tubing or steel strip surface still attached, and therefore work is required to recover the taken spheres and return them to the processing bath. Become. Further, the method disclosed in Japanese Patent Publication No. 52-19171 shown in FIG. 3 not only requires the opening and closing of the lid each time the tube material is loaded into or removed from the processing tank, but also requires high equipment costs. Further, the method of forming bubbles on the bath surface has drawbacks such as being uneconomical because it requires additives for forming bubbles in addition to the chemical liquid.

As a method of solving the above-mentioned drawbacks, a large number of small-diameter balls are floated over the entire surface of the acid solution of each pickling tank of the continuous pickling apparatus, and the strip surface of each pickling tank faces the strip surface. A method for preventing the ball from moving following the strip by a blocking member made of a plate-like elastic body (Japanese Patent Laid-Open No. 58-185782), in which a protruding portion protruding at a uniform height is provided around the periphery. Two fiber-reinforced thermosetting resin rectangular panels, each of which has an installation portion surrounded by the ridgeline of the root of the protrusion, are symmetrically positioned, and the outer surface of the frame is formed on the inner surface of the protrusion. There has been proposed a float (a Japanese Utility Model Publication No. 59-38445) in which the resin foam is abutted against the inside of the frame and the ends of the protrusions are fixed to each other.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The method disclosed in Japanese Patent No. 5782 is effective when the object to be processed is a strip, but has no effect when the object to be processed is a pipe material. In addition, the actual public Sho 59-38445
The float disclosed in the publication is effective when the object to be treated is a strip, but when the object to be treated is a pipe material, the float lid is opened and closed each time the pipe material is loaded into or removed from the processing tank. Has the drawback of being required.

An object of the present invention is to solve the above problems,
Without sticking to the surface of the pipe material and being taken out of the tank,
Moreover, it is an object of the present invention to provide a method for preventing heat radiation from a bath surface of a high temperature liquid tank, which can suppress heat radiation from a chemical solution and mist scattering without impeding loading / extraction of a pipe material into a treatment tank.

[0008]

Means for Solving the Problems The present inventors have conducted various tests and studies to achieve the above object. As a result, the reason why the spheres that have been conventionally floated over the entire surface of the chemical solution are taken out of the bath while being attached to the surface of the pipe material is that the spheres are small and lightweight, and the rod-like shape that can cover the entire length of the treatment bath. By floating the chemical liquid over the entire surface of the float in parallel with the pipe material, it is possible to prevent the float from being taken out of the tank without hindering the loading and extraction of the pipe material, and to suppress the evaporation and heat dissipation of the chemical liquid. The present invention has been reached by investigating what can be done.

That is, according to the present invention, in a method of preventing heat radiation from the bath surface of a high temperature liquid tank for performing a chemical solution treatment or a hot water washing treatment, the entire bath surface of the high temperature liquid tank is covered with a rod-shaped float. This is a method of preventing heat radiation from the bath surface.

[0010]

In the present invention, by covering the entire bath surface of the high-temperature liquid tank with the rod-shaped float, the rod-shaped float is pushed or divided by the material to be treated that has been lowered from the top when charging the material to be treated, The material to be treated can be immersed in the chemical solution in a short time without the need for an opening / closing device. In addition, since the float is rod-shaped, it is possible to prevent the material from adhering to the material to be processed and being taken out of the tank when the material to be processed is extracted.

The rod-like float shape used in the present invention is preferably a cylindrical shape because corners overlap each other. Further, when coating the entire bath surface of the high temperature liquid tank with the rod-shaped float, if the material to be treated is a pipe material, the high temperature liquid tank should be coated in parallel with the pipe material to be charged into the high temperature liquid tank. If the material to be treated is a strip, a rod-shaped float with a length almost the entire width of the hot liquid tank is formed so as to cover the entire bath surface at right angles to the traveling direction of the strip. To use. When the length of the rod-shaped float is shorter than the entire length or width of the high temperature liquid tank, there is a fear that a gap is formed between the rod-shaped floats at that portion. The material of the rod-shaped float is not particularly limited as long as it can float on the bath surface of the high temperature liquid tank, but is not limited to polyethylene, polyurethane,
It is possible to use a material having a certain degree of flexibility such as polystyrene and phenol resin, but polyethylene is economical.

The amount of the rod-shaped float required to constantly cover the entire bath surface of the high temperature liquid tank is 1.5 to 2 times the amount that can uniformly cover the entire bath surface of the high temperature liquid tank. Even if a part of the rod-shaped float becomes an underlay of the material to be treated at the time of charging the material to be treated, when the material to be treated is immersed in the chemical solution, the bath surface is covered with the excess rod-shaped float. By constantly covering the entire bath surface of the high-temperature liquid tank with a rod-shaped float, heat dissipation from the bath surface is greatly suppressed, and mist scattering from the bath surface is prevented, which can prevent deterioration of the working environment. .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the method of the present invention will be described below with reference to FIG. FIG. 1 is a conceptual diagram when a bath surface of a high temperature liquid tank according to the method of the present invention is covered with a rod-shaped float. In FIG. 1, 1 is a high temperature liquid tank, 2 is a high temperature liquid tank 1.
Inside, the high temperature liquid, 3 is a pipe material which is a material to be treated which is immersed in the high temperature liquid 2 in the high temperature liquid tank 1, 4 is a rod rod made of polyethylene, and has a length substantially equal to the entire length of the high temperature liquid tank 1. Further, it is configured to float on the surface of the high-temperature liquid 2 in parallel with the pipe material 3 and cover the entire surface of the high-temperature liquid 2 in the high-temperature liquid tank 1 to prevent heat dissipation from the bath surface.

With the above construction, the pipe material 3 is immersed in the high temperature liquid 2 in the high temperature liquid tank 1. Therefore, when the pipe material 3 is suspended from the upper portion and lowered by a crane or the like, the rod-shaped float 4 on the surface of the high temperature liquid 2 becomes Although it is pressed by 3 or becomes an underlay of the pipe material 3, when the pipe material 3 is immersed in the high temperature liquid 2, the surface of the high temperature liquid 2 is again covered with the rod-shaped float 4 to prevent heat dissipation from the bath surface. At the same time, mist scattering from the bath surface is prevented. Moreover, when the pipe 3 is extracted from the high temperature liquid 2 in the high temperature liquid tank 1 after the chemical treatment of the pipe 3 is completed, if the pipe 3 is lifted while being hung by a crane or the like, the rod-shaped float 4 on the surface of the high temperature liquid 2 Has a length almost equal to that of the high-temperature liquid tank 1, and therefore, after being pushed to both sides without adhering to the pipe material 3, the pipe material 3 moves to and covers the extracted high-temperature liquid 2 surface, The heat dissipation from the bath surface is prevented and the mist scattering from the bath surface is prevented.

According to the calculation by the present inventors, when the method of the present invention is applied to the die cleaner tank, the degreasing tank, and the chromate tank in the hot water washing place of the medium diameter pipe, it is possible to save 60 to 70% of steam. there were.

[0016]

As described above, according to the method of the present invention, the heat radiation from the bath surface of the high temperature liquid tank can be greatly reduced, and the cost can be greatly contributed by the energy saving. Further, it is possible to prevent the mist from scattering when the harmful chemical liquid is used, so that the working environment can be improved.

[Brief description of drawings]

FIG. 1 is a conceptual diagram when a bath surface of a high temperature liquid tank according to the method of the present invention is covered with a rod-shaped float.

FIG. 2 is a conceptual diagram of a method of suspending synthetic resin spheres on the bath surface of a conventional high temperature liquid tank.

FIG. 3 is a conceptual diagram of a method of installing a lid on a high temperature liquid tank disclosed in Japanese Patent Publication No. 52-19171.

[Explanation of symbols]

 1 High Temperature Liquid Tank 2 High Temperature Liquid 3 Tubular Material 4 Rod Float 21, 31 Treatment Tank 22 Treatment Liquid 23 Sphere 32 Lid 33 Wire Rope

Claims (1)

[Claims] 1. A method for preventing heat radiation from the bath surface of a high temperature liquid tank for performing a chemical solution treatment or a hot water washing treatment, characterized in that the entire bath surface of the high temperature liquid tank is covered with a rod-shaped float. Heat dissipation prevention method.