JPS6038674Y2 - Pickling tank - Google Patents

Description

[Detailed description of the invention] This invention relates to a pickling tank used for pickling work such as pickling of steel materials.It eliminates troubles such as acid leakage and also makes the lining as thin as possible. This relates to a pickling tank.

Traditionally, pickling tanks were made of iron plates with rubber lining or FRP.
Line it with acid-resistant and heat-resistant bricks.
However, in recent years, strong acid bath work at high temperatures of about 100'C has become necessary, and these acid-resistant and heat-resistant bricks alone have poor insulation properties, and rubber linings and FRP linings have been used to protect the gaps between the bricks and joints, and the joint mortar. The problem was that the high temperature acid passing through the tank corroded the tank, causing the acid inside the tank to leak to the outside.

Therefore, in order to cut off this high temperature acid,
As seen in No. 16, hard floating stone mica trachyte (fire-resistant stone) is cut into bricks of appropriate size, bonded and laminated with a joint material such as heat-resistant and acid-resistant cement, and the outer periphery of this is covered with concrete. It is known to have a structure in which the hard stone is surrounded by coating with acid- and alkali-resistant mortar, but this hard rock has a high thermal conductivity of 0.53 kcal/m-H・℃, and its internal structure is vertical and horizontal. It is a spongy igneous rock composed of lurid fibers, and most of the pores are continuous, so it is not only impossible to block out the acid in the tank, but also allows the acid to enter the pores. , and the thermal conductivity becomes even higher.

This invention eliminates these drawbacks of the lining of conventional pickling tanks, permanently eliminates any liquid leakage, has excellent insulation and heat retention, and makes the lining as thin as possible to increase the internal volume of the tank. It is something.

The details of the present invention will be described based on the drawings.

FIG. 1 shows the internal structure of the pickling tank of the present invention.

Reference numeral 1 denotes an iron plate constituting the outer wall of the tank. A fiber-reinforced plastic layer 2 is formed on the inner surface of this iron plate tank, and a ceramic foam 3 is laminated and fixed inside this with an acid-resistant joint material 4.

This ceramic foam 3 has a porosity and a water absorption rate of 2.
．． Extremely small, less than 0%, with a thermal conductivity of 0.35kca
It is an inorganic foam with closed pores of 1/m・H・℃ or less, and not only does it not allow acid to penetrate at all, but it also has excellent insulation and heat retention properties, and this excellence is different from other general insulation materials.
It can be maintained even when immersed in liquid.

The inner surface of this ceramic foam 3 is further 200 x 50
Acid-resistant and heat-resistant porcelain bricks 5 of x100 m/m are laminated and fixed using acid-resistant mortar 6.

Next, the temperature gradient of the tank wall in an embodiment of the present invention and the temperature gradient in a tank using hard flint-resistant stone are shown.

The structure of the tank using ceramic foam is as follows.

On the other hand, if a hard flint rock was used instead of the ceramic foam of the present invention, the internal temperature of the FRP would be 54.1°C, but if the liquid penetrated the flint surface, the liquid would flow inside the flint rock. gradually enters, and the thermal conductivity is at least 2.0kCa1/m.
-H1C or higher and the internal temperature of FRP is 61.2.
°C, the liquid that has entered the -bearing flint is not drained out and eventually causes thermal fatigue on the FRP surface, causing cracks and liquid leakage.

As described above, this invention uses FRP for the outer wall of the tank, which has excellent corrosion resistance and can be used as a structural material that can be formed even during dry-up.
Because it uses a steel plate lined with FRP, there is no possibility of liquid leakage, and the inner surface of this FRP layer is laminated with ceramic foam that has extremely low thermal conductivity and almost no liquid permeability. Therefore, it can permanently insulate and retain heat, protect the FRP layer, which has slightly poor heat resistance, from high-temperature strong acids, fully exhibit the characteristics of FRP, and prevent a drop in liquid temperature.

In addition, this ceramic foam has no liquid permeability and has excellent heat insulation properties, so in order to achieve the desired purpose, the thickness of the laminated layer can be reduced, resulting in an increase in the effective volume within the tank.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the present invention. 1... Steel plate, 2... Fiber reinforced plastic, 3... Ceramic foam, 4...
・Acid-resistant joint material.

Claims (1)

[Scope of utility model registration request] The inner surface of the tank, which is made of fiber-reinforced plastic (FRP) running on an iron plate, has a water absorption rate of 2.0% or less and a porosity of 2.0%.
Thermal conductivity is 0.35kcal/m・H・℃ below 0%
A pickling tank characterized in that it is lined with a ceramic foam having closed pores and further lined with acid-resistant and heat-resistant bricks.