阅读说明：本技术 热电厂脱硫装置玻璃鳞片防腐检修施工方法 (Thermal power plant desulphurization device glass scale anti-corrosion maintenance construction method ) 是由 刘永平 刘守田 于 2019-11-20 设计创作，主要内容包括：本发明涉及一种热电厂脱硫装置玻璃鳞片防腐检修施工方法,包括以下步骤：防腐层检查、破损处打磨处理、底漆涂刷、胶泥涂抹、质量检测及修补、耐磨层涂刷、面漆涂刷以及检查验收。该热电厂脱硫装置玻璃鳞片防腐检修施工方法,能够全面性的对受损防腐层进行高效、高质量的维修,维修后的防腐层抗腐蚀能力强,附着稳定,不容易脱落,玻璃鳞片衬里的附着力强,衬层的使用寿命长,施工方便的防腐施工方法,也可用于定期的检修过程中。(The invention relates to a thermal power plant desulphurization device glass scale anticorrosion maintenance construction method, which comprises the following steps: inspection of an anticorrosive layer, polishing treatment of a damaged part, painting of a primer, painting of daub, quality detection and repair, painting of a wear-resistant layer, painting of a finish paint and inspection and acceptance. The thermal power plant desulphurization unit glass flake anti-corrosion maintenance construction method can comprehensively maintain the damaged anticorrosive coating with high efficiency and high quality, the maintained anticorrosive coating has strong anti-corrosion capability, stable adhesion and difficult shedding, the glass flake lining has strong adhesive force, the lining has long service life, and the anti-corrosion construction method with convenient construction can also be used in the regular maintenance process.)

1. The anticorrosive maintenance construction method for the glass flakes of the desulfurization device of the thermal power plant is characterized by comprising the following steps of:

step S1, anticorrosive layer inspection:

1) firstly, visually inspecting the surface of the anticorrosive layer, and marking the uneven part and the damaged part of the surface layer by using a marking pen;

2) then, performing thickness detection on the original anticorrosive coating through an electromagnetic thickness gauge, testing at least three point positions in each square meter area on the anticorrosive coating, and marking by using a marker when the thickness of the original anticorrosive coating is tested to be lower than 2 mm;

3) finally, the original anticorrosive coating is comprehensively detected through an electric spark detector, and when a pinhole and a damaged part are found, a marking pen is used for marking;

step S2, grinding the damaged part: polishing the damaged part of the original anticorrosive layer until the surface of the steel is exposed, treating the surface of the steel, and polishing a groove on the original anticorrosive layer, wherein the slope of the groove is at least 30 degrees;

step S3, priming paint brushing: cleaning and polishing foreign matters on the surface to ensure no dust and impurities, adding a matched curing agent in a certain proportion into a pre-prepared primer, stirring for at least 3min, brushing the prepared primer on the surface to be lined after treatment by using a brush after stirring uniformly, wherein the using amount is 0.20kg/m²Coating a second primer in 12 hours after the first primer is coated, wherein the coating directions of the second primer are mutually perpendicular and the surface thickness is kept consistent, and inspecting the quality of the primer and ensuring that no coating missing part exists after the second primer is coated;

step S4, daubing: after the primer paint is completely hard dried, taking the flake daub premix, adding a matched curing agent in a certain proportion into the flake daub premix, uniformly stirring the flake daub premix for use, and applying the flake daub by adopting a coating roller pressing method until the daub thickness reaches 2 mm;

step S5, quality inspection and repair: performing appearance inspection, pinhole inspection and thickness inspection on the whole daub coating, simultaneously tapping the whole anticorrosive coating by using a small mallet for detection, and performing scale repair on unqualified points found by detection;

step S6, brushing the wear-resistant layer: smearing wear-resistant layer mucilage on a part with high wear resistance requirement in the desulfurization device, wherein the thickness of the wear-resistant layer mucilage is at least 0.5mm, and polishing and repairing the surface of the wear-resistant layer mucilage until the surface is uniform and smooth;

step S7, painting finish: when all the anticorrosive coatings are qualified, coating a layer of blended finish on the surface of the lining layer, wherein the coating directions of the finish are mutually vertical for 2 times, and the coating time interval of the two finishes is 12 hours;

step S8, checking and accepting: and (3) carrying out appearance defect inspection on the scale coating, inspecting through an electric spark leak detector, testing the thickness of the coating, finally carrying out hammering inspection, and checking and accepting after all indexes reach the standard.

2. The thermal power plant desulphurization device glass scale anti-corrosion overhaul construction method according to claim 1, characterized in that: the mass ratio of the primer to the matched curing agent is 100: 15-20, the mass ratio of the glass flake daub to the matched curing agent is 100: 10-15, and the mass ratio of the finish to the matched curing agent is 100: 15-20.

3. The thermal power plant desulphurization device glass flake anti-corrosion maintenance construction method as claimed in claim 1, wherein the smearing roller pressing method comprises the following steps:

1) daubing the daub on the protected surface according to a certain thickness requirement and a certain daubing direction by using tools such as a trowel, a plaster knife and the like, and then performing calendering, compacting and flattening in a uniform direction to enable the scales to be stacked and arranged according to a specified direction and then cured and formed, wherein the construction is completed in two times;

2) and immediately dipping a small amount of rolling liquid by a wool roller after each smearing, constructing the first layer with the thickness of 0.9-1.1mm, and constructing the second layer after the first layer is solidified, so that the thickness of the daub layer reaches 2 mm.

4. The thermal power plant desulphurization device glass scale anti-corrosion overhaul construction method according to claim 1, characterized in that: before the abrasion-resistant layer is coated, an FRP reinforcing layer is lined at a position where the structural stress on the equipment is relatively concentrated, a hand pasting method is adopted when the FRP reinforcing layer is lined, and the lining is sequentially vertical surface to plane, upper to lower, inner to outer, wall to bottom.

5. The thermal power plant desulphurization device glass scale anti-corrosion overhaul construction method according to claim 4, characterized in that: the FRP reinforcing layer is constructed by adopting a discontinuous method when being adhered with a lining, firstly, the lining cloth is coated with the sizing material, no air bubbles exist between the cloth and the sizing material and is adhered tightly, then the sizing material is coated on the cloth until the cloth is completely soaked, the lap joint between the cloth and the cloth is larger than 100mm, the adhesion is ensured to be smooth and free of defects such as air bubbles and sundries, the comprehensive quality inspection is carried out after the solidification, and the repairing is carried out after the defects are found.

Technical Field

The invention belongs to the technical field of corrosion prevention of glass flakes of a desulfurization device of a thermal power plant, and particularly relates to a construction method for corrosion prevention maintenance of the glass flakes of the desulfurization device of the thermal power plant.

Background

The vinyl ester glass flake daub has unique permeation-resistant barrier, good corrosion resistance, small hardening shrinkage, strong cohesiveness, easy local repair, high toughness, good mechanical property and surface hardness, and is suitable for steel structure linings under harsh environment conditions of various flue gases; protecting the inner and outer surfaces of liquid medium equipment, pipelines and storage tanks with the corrosion strength below the medium level; the acid making and desulfurizing environmental equipment of thermal power plants, smelting plants, chemical fertilizer plants and the like.

Because the inner wall of the tower is corroded by chemical media such as sulfurous acid, micro-heating steam, ammonium bisulfate, ammonium bisulfite and the like for a long time and by condensed acid when the device stops; water molecules and other chemical media penetrate the lining; the spraying liquid erodes and wears the absorption tower surface, and the damage position can appear after the contact corrosive substance of the former glass scale anticorrosive coating of tower inner wall is long-time, causes irreversible damage to the device body easily and leads to the life-span of whole device to shorten.

Disclosure of Invention

The invention aims to solve the problems and provide a heat power plant desulphurization device glass scale anti-corrosion maintenance construction method which is simple in structure and reasonable in design.

The invention realizes the purpose through the following technical scheme:

the anticorrosive maintenance construction method of the glass flakes of the desulfurization device of the thermal power plant comprises the following steps:

step S1, anticorrosive layer inspection:

1) firstly, visually inspecting the surface of the anticorrosive layer, and marking the uneven part and the damaged part of the surface layer by using a marking pen;

2) then, performing thickness detection on the original anticorrosive coating through an electromagnetic thickness gauge, testing at least three point positions in each square meter area on the anticorrosive coating, and marking by using a marker when the thickness of the original anticorrosive coating is tested to be lower than 2 mm;

3) finally, the original anticorrosive coating is comprehensively detected through an electric spark detector, and when a pinhole and a damaged part are found, a marking pen is used for marking;

step S2, grinding the damaged part: polishing the damaged part of the original anticorrosive layer until the surface of the steel is exposed, treating the surface of the steel, and polishing a groove on the original anticorrosive layer, wherein the slope of the groove is at least 30 degrees;

step S3, priming paint brushing: cleaning and polishing foreign matters on the surface to ensure no dust and impurities, adding a matched curing agent in a certain proportion into a pre-prepared primer, stirring for at least 3min, brushing the prepared primer on the surface to be lined after treatment by using a brush after uniform stirring, wherein the using amount is 0.20kg/m2, brushing a second primer in 12h after brushing the first primer, wherein the brushing directions of the second primer are mutually perpendicular and the surface thickness is kept consistent, and inspecting the quality of the primer and ensuring no missing coating position after finishing brushing;

step S4, daubing: after the primer paint is completely hard dried, taking the flake daub premix, adding a matched curing agent in a certain proportion into the flake daub premix, uniformly stirring the flake daub premix for use, and applying the flake daub by adopting a coating roller pressing method until the daub thickness reaches 2 mm;

step S5, quality inspection and repair: performing appearance inspection, pinhole inspection and thickness inspection on the whole daub coating, simultaneously tapping the whole anticorrosive coating by using a small mallet for detection, and performing scale repair on unqualified points found by detection;

step S6, brushing the wear-resistant layer: smearing wear-resistant layer mucilage on a part with high wear resistance requirement in the desulfurization device, wherein the thickness of the wear-resistant layer mucilage is at least 0.5mm, and polishing and repairing the surface of the wear-resistant layer mucilage until the surface is uniform and smooth;

step S7, painting finish: when all the anticorrosive coatings are qualified, coating a layer of blended finish on the surface of the lining layer, wherein the coating directions of the finish are mutually vertical for 2 times, and the coating time interval of the two finishes is 12 hours;

step S8, checking and accepting: and (3) carrying out appearance defect inspection on the scale coating, inspecting through an electric spark leak detector, testing the thickness of the coating, finally carrying out hammering inspection, and checking and accepting after all indexes reach the standard.

As a further optimization scheme of the invention, the mass ratio of the primer to the matched curing agent is 100: 15-20, the mass ratio of the glass flake daub to the matched curing agent is 100: 10-15, and the mass ratio of the finish to the matched curing agent is 100: 15-20.

As a further preferable aspect of the present invention, the painting roller pressing method includes the steps of:

1) daubing the daub on the protected surface according to a certain thickness requirement and a certain daubing direction by using tools such as a trowel, a plaster knife and the like, and then performing calendering, compacting and flattening in a uniform direction to enable the scales to be stacked and arranged according to a specified direction and then cured and formed, wherein the construction is completed in two times;

2) and immediately dipping a small amount of rolling liquid by a wool roller after each smearing, constructing the first layer with the thickness of 0.9-1.1mm, and constructing the second layer after the first layer is solidified, so that the thickness of the daub layer reaches 2 mm.

As a further optimization scheme of the invention, before the abrasion-resistant layer is coated, an FRP reinforcing layer is lined at a position with concentrated structural stress on equipment, a hand pasting method is adopted when the FRP reinforcing layer is lined, and the lining sequence is vertical surface first and plane surface first, up and down first, inner and outer first, wall first and bottom second.

As a further optimization scheme of the invention, the FRP reinforcement layer is constructed by adopting a discontinuous method when being lined, firstly, a sizing material is coated and then a lining cloth is lined, no air bubbles exist between the cloth and the sizing material and the cloth is tightly pasted, then the sizing material is coated and brushed on the cloth until the cloth is completely soaked, the lap joint between the cloth and the cloth is more than 100mm, the pasting is ensured to be flat and free from defects of air bubbles, sundries and the like, the comprehensive quality inspection is carried out after the solidification, and the repair is carried out after the defects are found.

The invention has the beneficial effects that: the invention can comprehensively maintain the damaged anticorrosive coating with high efficiency and high quality, the maintained anticorrosive coating has strong corrosion resistance, stable adhesion and difficult shedding, the glass scale lining has strong adhesion, the service life of the lining is long, the construction is convenient, and the invention can also be used in the regular maintenance process.

Drawings

FIG. 1 is a flow chart of the construction process of the present invention.

Detailed Description

The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.