JPH049480A - Method for locally repairing equipment lined with glass - Google Patents

Abstract

PURPOSE:To easily repair the damaged part of a glass layer by filling the inorganic sheet material into the damaged part of the glass layer in an equipment lined with glass and fixing it and thereafter performing surface finish for a gap part at a time of filling with a sol-gel glass repairing agent. CONSTITUTION:When a locally damaged part 3 is caused in a layer 2 lined with glass on the iron substrate 1 in an equipment lined with glass, the inorganic sheet material 4 described hereunder is filled into the damaged part 3 and stuck while utilizing a sol-gel glass aq. soln. of metallic alkoxide and metallic salts as a tackifier. This tackifier is solidified by performing air-drying and thereafter heating it at about 350 deg.C not higher than transition point of lining glass 2. Thereby the sheet material 4 being the repairing material is fixed into the damaged part 3. The inorganic sheet material 4 is allowed to coincide with the shape of the damaged part 3 and made of porous nonwoven fabric formed of glass fiber having nearly equal to the damaged part 3. The gap of the sheet 4 and the gap caused in the sol-gel glass 5 are applied with the repairing agent wherein inorganic powder such as fine alumina is mixed with the sol-gel glass aq. soln. and impregnated with this repairing agent. A surface finishing layer 6 is formed by heating and solidifying the repairing agent.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides glass-lined chemical reactors, storage tanks, piping parts, and enameled equipment used in harsh corrosive environments. The present invention relates to a method for locally repairing locally damaged parts of the lining glass layer that occur in vessels and members that have been constructed with.

(Prior Art) As an effective repair method for repairing locally damaged parts of the lining glass layer of glass-lined equipment using inorganic materials, earlier patent applications No. 1-63244 and No. 63245 of the same name have been proposed.
No. 80830 discloses various repair methods using repair agents starting from sol-gel glass aqueous solutions of organometallic compounds and metal salts represented by metal alkoxides. This repair is performed by repeating the process of applying a repair agent, drying, solization, gelation, and heating to a temperature of about 300℃ to synthesize glass, thereby creating a repair layer with approximately the same thickness as the normal lining glass layer. It is intended to form a Patent application Hei 1-6324
No. 4 discloses that a filler that is compatible with the properties required for the repair part can be selected and used by mixing it before gelling the basic repair agent, and also discloses examples of suitable fillers.

(Problems to be Solved by the Invention) Sol-gel glass aqueous solution repair agents contract significantly as they react and solidify, creating voids, so even if an inorganic sheet is mixed with the repair agent, sufficient gap-filling action cannot be achieved. The thickness of the lining glass layer is 1~
In order to form a sound, void-free glass repair layer to a thickness that is approximately the same as that of 2InI11, it is necessary to repeat repair work at least five times, which poses the problem of being uneconomical.

(Means for Solving the Problems) In order to solve the above-mentioned problems of the prior art, the present invention uses a lining instead of a powdery inorganic filler that moves following the sol-gel glass repair agent and changes its shape. Using an inorganic sheet with a shape and thickness almost equal to the shape and thickness of the damaged part of the glass layer, it is first applied to the damaged part with a sol-gel glass repair agent, and the shape changes depending on the shrinkage of the sol-gel glass repair agent. By allowing the inorganic sheet to occupy the entire area of the damaged part, the porosity filling ratio of the repair agent in the subsequent repair process is increased.

By integrating these solutions, the local repair method for glass lining equipment of the present invention has the overall structure of glass lining fa R? In order to repair the localized damage that occurred in the lining glass layer of = with an inorganic material, an inorganic sheet material formed to match the shape of the damage was applied to the damage with a sol-gel glass aqueous solution of metal alkoxides and metal salts. It is characterized in that after it is pasted and filled, it is heated to a temperature below the transition point of the lining glass to react and solidify it, fixing it to the damaged part, and then repairing it with a sol-gel glass aqueous solution.

Hereinafter, the solving means of the present invention will be specifically illustrated as follows with reference to the accompanying drawings. A damaged area (3) that was shaped to repair a localized damaged area (3) that occurred in the lining glass layer (2) on the iron material (1) of the glass-lined equipment.
Inorganic sheet material (4) that conforms to the shape of and has approximately the same thickness.
Apply to the damaged area. As the inorganic sheet material (4), glass cloth woven with long glass fibers, non-woven fabric made with short fibers of ceramic material, etc. can be used.

The sol-gel glass aqueous solution for adhesion is prepared by stirring and mixing the basic repair material with the following basic structure composition at 25°C for 1 hour.

Silicon tetraethoxide 20 g'85 X phosphoric acid 1 gr ethanol
20 g' water
20g' Apply the inorganic sheet material (4) to the repaired area (3) using this repair material, air dry for 30 minutes, and then dry the inorganic sheet material (4) at 35% below the transition point of the lining glass (2).
Heat treatment is performed at 0° C. for 10 minutes to solidify the repair material and fix it in a state that fills the damaged part. (5) is the solidified glass made from the repair agent used to form the lower layer repair portion made in this manner.

After this process, a repair agent made by mixing the above basic repair agent with inorganic fine powder with a diameter of 1 μm or less is applied to remove the cracks between the inorganic sheet material (4) and the solidified sol-gel glass (5) in the lower repair area. The process of impregnating the voids, air drying for <30 minutes, and then heat-treating at 350° C. for 10 minutes is repeated to form the surface finishing layer (6) of the repaired area.

(Function) The lining glass layer of glass-lined equipment is 1 to 2 m.
If an attempt is made to form a glass repair part of this thickness on a damaged part using only a sol-gel glass repair agent having the above-mentioned basic structure, which has a thickness of m, a crank will occur in the film due to shrinkage during drying. To avoid cracks, it is necessary to dry slowly for about a month, and it is possible to synthesize a glass thin film with a thickness of 1 μm or less without cracks. The number of construction operations will be extremely high. Although the number of repeated construction steps is reduced to some extent by using a repair agent mixed with an inorganic powder filler, it is still large.

According to the present invention, since most of the thickness can be formed using non-J sheet material, only the surface finishing step is required, and the number of steps and construction time can be reduced to a fraction of that of the conventional technology.

The inorganic sheet material that achieves this effect has excellent chemical resistance and flexibility, making it easy to apply to damaged areas, and is porous and impregnated with sol/gel glass repair agents. Something is desirable. If this point is satisfied, E glass, zirconia fiber, etc. can be used.

(Example) A sol-gel aqueous solution with the following composition was used as a basic repair agent.
It was prepared by stirring and mixing at °C for 1 hour.

Silicon tetraethoxide 20g185χ phosphoric acid
1 g'ethanol
20 g' water
20 g' Thickness 2 for repairing damaged parts
After constructing a glass lining with a thickness of IM on a 100 am square 5S41 steel plate, a diameter of approximately 40 mm is placed in the center of the glass lining.
A broken part of the lining glass layer was formed.

According to the method of the present invention, a glass cloth of the same shape and approximately the same thickness as the surrounding lining glass layer is pasted on the damaged area using the above basic repair agent, and after air drying for 30 minutes,
A repair underlayer was formed by heat treatment at 0°C for 10 minutes.

For comparison, a repair method using glass powder mixed with the basic repair agent was carried out, but it required 7 repetitions to achieve the same thickness, and the number of steps in the present invention is only a few times that of this conventional method. It becomes 1.

As a finishing layer, a repair material made by mixing alumina fine powder of 1 μm or less with the basic repair agent was applied and impregnated, and the same <30
After air drying, heat treatment was performed at 350° C. for 10 minutes, and the surface layer of the repaired area was finished with a smooth surface with little adhesion. The finishing layer may be applied a small number of times.

(Effects of the Invention) When a damaged part of the lining glass layer of a glass-lined device is repaired by the method of the present invention, a repaired part equivalent to the surrounding sound lining glass layer can be formed, and the repaired part has a good surface condition and is durable. Improves adhesion and chemical resistance, extending equipment life. Further, according to the present invention, the time required for repair work is significantly shortened, and the shutdown period of the plant including the equipment is accordingly shortened, thereby improving the operating rate.

[Brief explanation of drawings]

The attached drawing is a longitudinal sectional side view schematically showing a repaired portion of a damaged lining glass layer by the method of the present invention. (1)...Iron fabric, (2)...Lining glass layer, (3)...Damaged part, (4)...Inorganic sheet material,
(5)...Solidified glass, (6)...Surface finishing layer. Broken part of lining glass layer surface finishing layer solidified glass Inorganic sheet material Iron fabric drawing

Claims (1)

[Claims] In order to repair locally damaged parts of the lining glass layer of glass lining equipment with an inorganic material, an inorganic sheet material formed to match the shape of the damaged part is treated with a sol-gel glass aqueous solution of metal alkoxides and metal salts. A glass lining device characterized in that the glass lining equipment is repaired with a sol-gel glass aqueous solution through a process of pasting it on the broken part, filling it, heat-treating it at a temperature below the transition point of the lining glass, reacting and solidifying it, and fixing it to the damaged part. Local repair method.