JPH06257957A - Ceramic fiber module provided with iron skin corrosion inhibitor - Google Patents

Abstract

PURPOSE:To permit highly efficient mounting work by a method wherein corrosion preventing treatment can be applied on an iron skin simultaneously with the mounting of a ceramic fiber module onto the iron skin. CONSTITUTION:In a ceramic fiber module, formed so as to be a block type by laminating ceramic fiber brackets and accommodating a mounting metal, mounted to an iron skin, therein, a welding tip 9 is provided integrally with a stud bolt 4, penetratingly, supported by the mounting seat 3 of the mounting metal 2, while an iron skin corrosion inhibitor 11 received in a small vessel, enclosing the iron skin corrosion inhibitor and capable of developing the corrosion inhibitor on the surface of the iron skin upon working, is interposed between glass 10, surrounding the welding tip 9, and the mounting seat 3. The iron skin corrosion inhibitor 11, received in the small vessel, is developed on the iron skin 5 upon welding the welding tip whereby crossion preventing treatment can be applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic fiber module provided with an iron skin corrosion inhibitor capable of preventing corrosion of the iron shell after the ceramic fiber module is attached to the iron shell of a furnace.

[0002]

2. Description of the Related Art When lining a highly heat-insulating ceramic fiber in an industrial heating furnace using heavy oil as a fuel or in various heat treatment equipment in a petrochemical plant, the temperature on the shell side falls below the dew point and the water content adheres to it. It is known that sulfur and the like in the fuel react with each other to form sulfuric acid and promote the progress of corrosion of the iron skin.

[0003] Therefore, generally, a measure is taken to prevent oxidation by applying an acid resistant paint or castable on the surface of the iron shell before lining with ceramic fiber.

[0004]

However, as shown in FIG. 4, ceramic fiber blankets are laminated in blocks to form a ceramic fiber module 1, and a stud bolt is inserted into the mounting seat 3 of the mounting bracket 2 embedded therein. 4 is electrically welded and fixed to the iron shell 5, and the ceramic fiber module 1 is attached to the iron shell 5 by fixing the mounting seat 3 with a nut 6 screwed to the bolt 4. If the skin 5 is subjected to anticorrosion treatment in advance, the electrical conductivity at the time of welding will be lost and the welding will become difficult and the workability will deteriorate.

Therefore, when mounting using the ceramic fiber module 1 as described above, the steel shell 5 is previously prepared.
The stud bolts 4 are welded to the stud bolts 4 and then subjected to anticorrosion treatment, and then the mounting seats 3 of the mounting brackets 2 in the ceramic fiber module 1 are passed through the stud bolts 4 and the nuts 6 are tightened. There is a problem that it is not easy to align the position of and the mounting seat 3, the mounting work is troublesome, and the work efficiency is significantly lower than the mounting work by electric welding using a dedicated gun.

In view of this, the present invention has a ceramic fiber module provided with an iron skin corrosion inhibitor capable of simultaneously performing a corrosion prevention treatment on the iron skin when the ceramic fiber module is attached to the iron skin and enabling highly efficient installation work. It is intended to provide.

[0007]

As a means for solving the problems of the above-mentioned prior art, the present invention is to mount a ceramic fiber blanket in a block shape to internally mount a metal fitting to a steel shell. In the built-in ceramic fiber module, a welding tip is integrally provided at the tip of a stud bolt that is inserted into and supported by the mounting seat of the mounting bracket, and a steel shell corrosion is provided between the insulator surrounding the welding tip and the mounting seat. An iron shell corrosion inhibitor containing a small container that contains an anti-corrosion agent and can spread on the iron skin surface at the time of construction. It is characterized in that it is developed on the surface to be subjected to anticorrosion treatment.

[0008]

When the welding gun is inserted toward the stud bolt supported by the mounting seat of the mounting bracket and electric welding is performed, the welding tip is melted and the stud bolt is welded to the iron shell. Due to the heat generated during this welding, the iron shell corrosion inhibitor contained in the small container spreads on the surface of the iron shell to perform the corrosion prevention treatment. Therefore, the periphery of the stud bolt including the welded portion is in the same corrosion protection state as when the iron skin corrosion inhibitor is applied, and the structure has excellent acid resistance.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 is an exploded view of a necessary member in the present invention, FIG. 2 is a sectional view when welding, FIG. 3 is a sectional view when tightening a nut, and FIG. 4 is a ceramic fiber module 1 (hereinafter simply referred to as a module). The conventional example is used as an example of the construction form.

The mounting member 2 built in this module is formed into a substantially U-shape by bending a metal rod, and a mounting seat 3 made of a flat plate is integrally provided on one side of an intermediate portion of the mounting member 2 by welding or the like. The mounting seat 3 is provided with a hole 3a for inserting and supporting the stud bolt 4.

Also, the leg portions 2a, 2 on both ends of the mounting member 2
In a, adjacent modules 1, 1 ... As shown in FIG.
The guide pipes 8, 8 of the rod 7 which is inserted through the guide pipe 8 are set, and both ends of the guide pipe 8 are opened at the side surfaces of the module 1, respectively.

A welding tip 9 serving as a welding rod is integrally provided at the tip of the stud bolt 4 inserted through the hole 3a of the mounting seat 3, and a cylindrical insulator 10 is provided around the welding tip 9. An iron skin corrosion inhibitor 11 in a small container is interposed between the insulator 10 and the mounting seat 3.

The iron-corrosion inhibitor 11 contained in the small container is made of a material such as polyethylene, polypropylene, vinyl chloride or polyvinylidene chloride which is contacted by heat during welding as shown in FIG. A doughnut-shaped or perforated rectangular film made of synthetic resin film (preferably a resin that does not contain chlorine) is welded to the inside and outside of the film, and a steel skin corrosion inhibitor is sealed inside, or large or small. Two types of tube-shaped material are cut into thin slices, and a steel-corrosion inhibitor is put between them to form a seal, and the top and bottom are sealed with a film, such as the mounting seat 3 and the insulator 10. Any form that can be intervened between

As the insulator 10, one having a strength such that it can be crushed between the iron skin 5 and the mounting seat 3 by tightening a nut 11 screwed to the stud bolt 4 is used.

In the figure, reference numeral 12 denotes an aluminum pipe for inserting a welding gun, which is a pipe for automatically rotating after welding and for tightening a nut by turning it with a constant torque.

In order to install the module 1 on the iron skin 5, a welding gun is inserted through the aluminum pipe 12 toward the stud bolt 4 inserted and supported in the hole 3a of the mounting seat 3 of the mounting bracket 2, When electric welding is performed, the welding tip 9
Melts and the stud bolt 4 is welded to the steel shell 5. At this time, due to the heat of welding, the small container of the iron skin corrosion inhibitor 11 contained in the small container is melted to develop the iron skin corrosion inhibitor, and the iron skin corrosion inhibitor is applied to the welded portion of the stud bolt 4 and its periphery. It will be in a state of being.

A nut 6 screwed into the stud bolt 4
When the aluminum pipe 12 is rotated and tightened, the insulator 10 interposed between the iron skin 5 and the mounting seat 3 is crushed by the applied pressure, shattered and shattered downward. In this way, the mounting seat 3 comes into close contact with the iron skin 5 and is fixed.

As a concrete work procedure of the above work, it is preferable to carry out in the following order. Blacking is performed on the basis of the layout for constructing the module 1 on the iron skin 5. Mark a position corresponding to the welding position of the rod 7 of the module 1 for each one, and 30 to 60φ with this mark as the center
Masking. The surface of the iron skin 5 is sprayed with a corrosion inhibitor, and the masking is removed after a lapse of time. The stud bolt 4 is welded to the mark after the masking has been peeled off according to the procedure described above, and the module 1 is mounted.

As the iron skin corrosion inhibitor, for example, one containing alumina, graphite, magnesia, ferric oxide or zirconia as a main component can be used.

Next, experimental results will be described. A polypropylene 4φ tube with a donut-shaped small container filled with an iron skin corrosion inhibitor was used. One side with two polyethylene films stacked
Make a square shape of mm, make a hole through which the stud bolt 4 passes in the center, seal the outer circumference and the periphery of the hole with a high frequency sewing machine with a high frequency sewing machine to form a bag, and fill the inside with a steel skin corrosion inhibitor. The one with the mouth closed was used. As a comparative example, a material containing no iron corrosion inhibitor 11 in a small container was prepared.

A test was carried out in which the above materials were attached to the side walls of a test kiln, and C heavy oil was repeatedly heated and cooled by air heating.

When the welded portion was visually inspected after being disassembled after being repeatedly heated and cooled 50 times, a considerable amount of rust was observed in the welded portion of the comparative product, whereas in the product of the present invention, The corrosion inhibitor is spread around the area and applied, and rust was observed on the uncoated part on the outer side, but there was no rust at the developed part of the corrosion inhibitor,
It was confirmed that it was well protected.

[0024]

As described above, according to the present invention, when the stud bolt is welded, the steel skin corrosion inhibitor is spread in the peripheral region including the welded portion of the stud bolt, so that the corrosion inhibitor can be applied before the construction. Even if it is not applied, it has a structure that is anticorrosion treated, ensuring the corrosion resistance of the iron shell even in heating furnaces and heat treatment equipment that use heavy oil such that highly corrosive gas is concentrated on the iron shell side. Further, since the corrosion inhibitor is automatically spread, no extra work is required and the construction advantages of the welding gun can be maximized.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of components of the present invention.

FIG. 2 is a sectional view of a stud bolt when welding.

FIG. 3 is a sectional view showing a state in which a nut is tightened after welding.

FIG. 4 is a perspective view showing a construction example of a ceramic fiber module.

[Explanation of symbols]

 1 Ceramic Fiber Module 2 Mounting Bracket 3 Mounting Seat 4 Stud Bolt 5 Iron Skin 6 Nut 9 Welding Tip 10 Insulator 11 Iron Skin Corrosion Inhibitor

Claims (1)

[Claims] 1. A ceramic fiber module in which ceramic fiber blankets are laminated in a block shape and a fitting for attaching to an iron skin is built in the ceramic fiber module. Welding to the tip of a stud bolt inserted into and supported by a mounting seat of the fitting. The tip is integrally provided, and a steel container corrosion inhibitor is included between the insulator surrounding the welding tip and the mounting seat, and the corrosion inhibitor can be spread on the steel surface during construction. An iron skin corrosion inhibitor characterized by interposing an inhibitor, wherein the iron skin corrosion inhibitor contained in the small container is spread on the iron skin surface to perform anticorrosion treatment during welding of the welding tip. Ceramic fiber module.