JP5519270B2 - Repair method for glass lining equipment - Google Patents

Description

  The present invention relates to a method for repairing a glass-lined device and a base material that has been thinned due to the occurrence of the defect in a glass-lined device for imparting corrosion resistance or preventing adhesion (dirt).

  Conventionally, in reactors, storage tanks, pipes, etc. that come in contact with corrosive chemicals such as acids and alkalis, or in contact with adhesive chemicals such as synthetic rubber, the contact surface is a glass lining layer. Therefore, corrosion prevention or adhesion (dirt) prevention is achieved.

  However, the glass lining surface is cracked or chipped due to the difference in expansion coefficient between the glass lining and the base material, or because the glass lining surface is scratched during cleaning. A chemical substance penetrates from the cracks and defects, and erodes the base material that does not have corrosion resistance. As a result, metal contamination into chemical substances and thinning of the base material that should maintain mechanical strength proceed, and the equipment itself must be renewed. In addition, synthetic rubber or the like adheres to cracks or chipped portions and becomes dirty, causing problems such as a decrease in thermal conductivity and clogging of piping.

  For this reason, as a method for repairing the defective portion of the glass lining, a method of forming a protective layer using a fluorine-based resin or an epoxy resin (Japanese Patent Laid-Open Nos. 63-262481 and 63-265845). ), A method of applying and curing a metal compound or a gel sol repair material comprising an inorganic powder and a photoexcitation catalyst (JP-A-3-274289 (Patent Document 3), JP-A-5-9753 (Patent Document 4), JP-A-5-117877) (Patent Document 5), JP-A-6-87616 (Patent Document 6), JP-A-7-48144 (Patent Document 7)), a method of fusing glass (JP-A-6-264266 (Patent Document 8), JP2002-2002). -69670 (Patent Document 9), a method in which a metal layer is formed by electroless plating spraying after metal sputtering in a damaged portion (Japanese Patent Laid-Open No. 11-12764 (Patent Document 10). ) It has been proposed.

  In the above-described resin protective layer formation, gel sol repair method, and glass fusing method, there is a problem that sufficient adhesion between the base material and the repair portion cannot be obtained, and the repair portion peels off over time. A repair method such as plating or spraying a metal layer after sputtering a noble metal such as gold is inferior in workability in the field such as in a reaction tank or a storage tank. In addition, there is a problem that a crack expands from the damaged part to the peripheral part during the work.

  These methods are repair methods for a broken or missing glass lining layer, and can be applied to a portion where the base material is thinned. However, there is a problem that it cannot be performed until recovery of the decrease in mechanical strength due to the thinning of the base material. And, as a method of repairing the thinned portion of the base material, it is conceivable to perform metal spraying or welding, but due to the heat generated during the thermal spraying or welding of the portion of the normal glass lining layer around the thinned portion, There is a problem of being damaged. It is possible to suppress damage to the glass lining layer by reducing the temperature during metal spraying or welding due to the above-mentioned problems, but low temperature cracking occurs in the sprayed or welded part, and the mechanical strength of the base metal is sufficient There is a problem that cannot be recovered.

JP-A-63-262481

JP-A 63-265845

JP-A-3-274289

Japanese Patent Laid-Open No. 5-9753

Japanese Patent Laid-Open No. 5-117877

JP-A-6-87616

JP 7-48144 A

JP-A-6-264266

JP 2002-69670 A

Japanese Patent Application Laid-Open No. 11-12764

  When repairing the glass lining layer of glass lining equipment, the adhesiveness of the repaired part is excellent, and when repairing the part where the base material has been thinned due to a defect in the glass lining layer, It is an object of the present invention to provide a repair method that restores mechanical strength and does not cause cracks in the glass lining layer around the thinned portion of the base material during repair.

  The present inventor has achieved excellent glass lining adhesion to the base material while damaging the surrounding glass lining layer as much as possible and recovering the mechanical strength of the portion where the base material has been thinned. As a result of diligent research on the method of repairing the layer, while installing a heat insulating material around the damaged part of the glass lining, and controlling the temperature of the glass lining layer on the outer peripheral part of the heat insulating material, the damaged part is resistant to corrosion. The inventors have found a method for repairing a glass lining around the damaged part by spraying or welding a metal having excellent resistance without causing new damage, and the present invention has been achieved.

That is, according to the present invention, in repairing a defective portion of the glass lining of the glass lining apparatus, a heat insulating material is provided around the repaired portion, and the temperature of the glass lining in the outer peripheral portion of the heat insulating material is maintained at 60 ° C. or lower. A repair method for spraying or welding stainless steel to the repair portion is provided.

  By repairing the glass lining equipment with the repair method specified in the present invention, not only is the repair part excellent in adhesive strength, but it can withstand long-term use, and the base metal has been thinned However, it is possible to recover the mechanical strength and to prevent the glass lining from expanding around the damaged part during repair.

It is sectional drawing before repair of a test plate. It is sectional drawing during repair of a test plate. It is sectional drawing after repair of a test plate.

Hereinafter, the present invention will be described in detail. The glass lining device targeted by the present invention is on the surface of a base material that is inferior in corrosion resistance or may come into contact with an adhesive chemical substance such as synthetic rubber. These include reaction tanks, pipes, and storage tanks where glass is fused. The thickness of the glass lining varies depending on the size of the main body of the device, the use, etc., but is approximately 1.0 to 3.0 mm and is formed by repeated operations of applying and firing the glass particles.

  In the present invention, a heat insulating material is installed in order to prevent the heat generated when the portion to be repaired is subjected to metal spraying or welding to the glass other than the vicinity of the portion to be repaired or to block heat conduction. The heat insulating material has a function of blocking or reducing heat so that heat generated by metal spraying or welding is not transmitted to the peripheral portion outside the repair. A specific heat insulating material is a substance mainly composed of silicon dioxide. For example, a substance in which silicon dioxide is the main component and an organic or inorganic substance is blended and kneaded. Although there is no restriction | limiting in the form (liquid, powder, cream form, etc.), since it apply | coats to the vicinity of the repair object part, cream form is optimal. The vicinity of the repair target part means the boundary between the damaged part and the non-damaged part of the glass lining.

  The amount of the heat insulating material used can be appropriately adjusted according to the size of the portion to be repaired, the time of the thermal spraying / welding operation, and the temperature to be managed around the outside where the heat insulating material is installed.

  In the repair method of the present invention, it is important to apply a heat insulating material in the vicinity of the portion to be repaired and control the surface temperature of the glass lining in the outer peripheral portion of the heat insulating material to be 60 ° C. or lower. Examples of the method for controlling the surface temperature of the glass lining to 60 ° C. or less include adjustment of the location and amount of the heat insulating material and thermal spraying or welding time. Preferably it is 55 degrees C or less, More preferably, it is 50 degrees C or less. The temperature of the glass lining surface can be measured and managed with a known temperature measuring device. In addition, the surface temperature of the glass lining needs to be measured within 5cm from the outer part of the heat insulating material, but considering that it is better not to apply heat to the glass lining as much as possible, it should be within 2cm. Is more preferable.

  Glass lining is created by spraying or welding a corrosion-resistant metal to restore at least the original thickness of the base metal that has been damaged by chemicals due to a lack of glass lining. The strength of the device itself can be restored. Even if the glass lining is cracked and the metal base metal is not thinned, if it is left as it is, the corrosive substance will erode the base metal along the crack and cause glass thinning. After the lining is peeled off and the base material is exposed, it is possible to prevent the base material from being thinned by spraying or welding a metal having corrosion resistance. An example of the corrosion-resistant metal is stainless steel.

  As a thermal spraying or welding method for a metal having corrosion resistance, a conventionally known thermal spraying or welding method can be applied.

  Even when repairing is performed by building up, there is a slight gap between the glass lining and the building up. As a method for eliminating such a gap, there is a repair using a known resin or the like. By performing the above-described repair, there is no gap between the glass lining and the repaired portion, and the reaction tank and the like can withstand longer use.

  Hereinafter, the repair method of the glass lining apparatus which is this invention is demonstrated along drawing.

  A test plate was produced by subjecting a flat base material 1 made of SB490B (JIS standard) to a known glass lining treatment (a thickness of the base material 1 of 30 mm and a thickness of the glass lining 2 of 2 mm). A part of the glass lining 2 of the test plate was peeled off, and the base material 1 was shaved to produce a base metal thinning portion 4 having a diameter of 60 mm and a depth of 7 mm (FIG. 1). Before welding the corrosion-resistant metal 5, a cream-like substance (trade name Courmit, manufactured by Aus Co., Ltd.) mainly composed of silicon dioxide was used as the heat insulating material 6 for protecting the glass lining 2. The heat insulating material 6 was placed in the vicinity of the broken portion 3 of the glass lining so as to have a width of 40 mm and a height of 20 mm.

  After placing the heat insulating material 6, using 23% Cr and 14% Ni stainless steel (trade name TGS-309, manufactured by Kobe Steel, Ltd.) as a corrosion-resistant metal 5 (welding rod), a known TIG welding method is used. Then, the base metal thinned portion 4 was welded until the height of the glass lining 2 was reached (FIG. 2). However, when performing welding, the surface temperature of the glass lining 2 at the temperature measurement point 7 (place 2 cm away from the outer periphery of the heat insulating material), which is the outer part of the heat insulating material 6, does not exceed 60 ° C. Monitoring was performed with a non-contact thermometer.

  After welding, the upper surface of the welded portion was polished to create a smooth surface. The space 8 between the glass lining 2 and the welded portion can be repaired with higher corrosion resistance by eliminating the space using a known repair agent 9. In this example, repair was performed to fill the space 8 using a paste (trade name Supermetal, manufactured by Verzona) specially blended with ceramic, metal, carbon and other powders and polymer resin as the repair agent 9 (FIG. 3). . By performing such repair, the repaired part and the repaired peripheral part become uniform surfaces, and the space 8 between them is eliminated, so that it can be used for a longer period of time.

  After spraying, an ultrasonic flaw detector (trade name EPOCHIV manufactured by Olympus Co., Ltd.) was used to check whether there was a defect in the sprayed portion, but no scratches that caused problems in strength were found.

  In addition, in the said Example, although the case where the base material of a glass lining apparatus was thinned was described, the base material will be eroded in the future also about the damage of the glass lining to the extent that the base material is not exposed. Since the possibility is high, it is also effective to remove the glass lining of the damaged part and repair the exposed base material part by the method of the present invention.

Comparative example

  When spraying the base metal thinned portion, repair was performed in the same manner as in the example except that the heat insulating material was not used. As a result, the glass lining around the repaired portion was damaged by the heat generated during the thermal spraying, so the object of the present invention could not be achieved.

  By performing repairs using the present invention, not only is the adhesive strength of the repaired part excellent, but it is possible to recover the mechanical strength even if the base material has been thinned, and further, breakage during repair The crack expansion of the glass lining around the part can be prevented. As a result, the glass lining device repaired by the method of the present invention can withstand long-term use even after repair.

1: Base material 2 of test plate 2: Glass lining 3: Part where glass lining is broken or missing 4: Part where base material is thinned due to lack of glass lining 5: Metal with excellent corrosion resistance 6: Heat insulation Material 7: Temperature measurement point 8: Space between glass lining and welded part 9: Repair agent

Claims (3)

In repairing the glass defects of glass lining equipment and parts where the base metal has been thinned due to glass defects, a heat insulating material is provided in the vicinity of the repaired part, and the surface temperature of the glass lining at the outer peripheral part of the heat insulating material is set. A method for repairing glass lining equipment, characterized by spraying or welding stainless steel to a repaired part while maintaining the temperature at 60 ° C. or lower. The repair method of the glass lining apparatus of Claim 1 whose heat insulating material is a cream-like substance which has silicon dioxide as a main component. Base material constituting the glass-lined equipment is characterized in medium-carbon steel der Rukoto method of repairing glass-lined apparatus according to claim 1 or 2.