CN103759282B - A kind of anticorrosion method for interior of metal flue - Google Patents
A kind of anticorrosion method for interior of metal flue Download PDFInfo
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- CN103759282B CN103759282B CN201410037285.6A CN201410037285A CN103759282B CN 103759282 B CN103759282 B CN 103759282B CN 201410037285 A CN201410037285 A CN 201410037285A CN 103759282 B CN103759282 B CN 103759282B
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Abstract
The present invention relates to a kind of anticorrosion method for interior of metal flue, is anti-corrosion material with flexible graphite plate, and the flexible graphite plate scribbling adhesive is mounted on the metal flue inner surface scribbling adhesive by the adhesive normal temperature cure of selecting; Fill graphite cement; Graphite spraying slurry.The method is mated formation quick and convenient, and construction is simple, can resistance to 250 DEG C of high temperature, can acid corrosion-resistant, is applicable to various neutrality, sour gas or fluid pipeline, as various metal chimney, oil, sewage conduct etc., is used in flue inside anticorrosion.
Description
Technical field
The present invention is a kind of metal flue anti-corrosion method, belongs to technical field of metal anti-corrosion, is applicable to flue inner wall high temperature and diluted acid corrosive atmosphere.
Background technology
The high-temperature flue gas (150 DEG C-200 DEG C) produced in Refuse Incineration Process need be discharged by metal flue, and high-temperature flue gas mainly consists of HCl, HF, SO
2, NO
x, CO etc., meet with some chemical mediator, produce dilute sulfuric acid, sulfate or other compound, there is extremely strong corrosivity, bring dew point corrosion problem to metal flue.Therefore, how to prevent above-mentioned high-temperature acidic flue gas from having become a guardian technique difficult problem to metal flue corrosion.
Metal current is anticorrosion mainly contains electrochemical anti-corrosive and coating antiseptic.Electrochemical anti-corrosive principle changes protected metal current potential with direct current, thus corrosion is slowed down or stops.Mainly contain external power cathode protection method, galvanic anode protection method at present, the former is due to the long-term galvanization of needs, and its equipment comparatively bothers, and the latter needs to sacrifice other metal, and needs to change in time.Corrosion-inhibiting coating can be divided into polyethylene anticorrosion coating, polyurethane anticorrosion coating, flake mortar coating coating etc., polyethylene anticorrosion coating is generally made up of bottom epoxy powder, middle level adhesive and surface layer polyethylene, its serviceability temperature is generally no more than 55 DEG C, if during spraying operation technical arrangement plan improper or coating time air enter, then very easily there is lamination, cause splitting.Before inwall coating polyurethane need metallic conduit to be preheating to 60-80 DEG C, this constructs difficult for large scale pipeline, and in addition, the serviceability temperature of polyurethane anticorrosion coating is 109 DEG C, lower than high-temperature flue-gas.At present in high-temperature flue gas is anticorrosion, flake mortar coatings applications is the most extensive, different according to resin matrix base material, flake mortar separable ring epoxy resins flake mortar and alicyclic vinyl flake mortar, comparatively speaking, the combination property of alicyclic vinyl flake mortar comprises decay resistance and heat resistance is all better than epoxy resin flake mortar.Flake mortar coating generally forms by five layers, i.e. bottom, clay layer, fiberglass reinforced layer, clay layer and finishing coat.Flake mortar contains the glass flake that 10% ~ 40% footpath is not waited, clay is after construction, the glass flake of platypelloid type is parallel overlapping arrangement in resin continuous phase, thus form fine and close impermeable structure, infiltration in corrosive medium clay after hardening has to pass through the approach without several complications, therefore, in certain thickness anti-corrosion layer, corrosion penetration distance extends greatly, is equivalent to the thickness effectively increasing corrosion-resistant coating.Generally speaking, flake mortar work progress is complicated, and difficulty is comparatively large, is difficult to avoid pin hole, air blister defect to produce, and when high-temperature flue gas passes at a high speed flue with the speed of 10 ~ 20m/s, flake mortar coating is easily peeled off.
The problems such as above-mentioned corrosion-inhibiting coating heat resistance is not good in order to overcome, complicated construction technique, the present invention proposes a kind of metal flue anti-corrosion method, and it has good high temperature resistant, acid-fast ability, simple, normal temperature (25 DEG C) solidification of simultaneously constructing.
Summary of the invention
The invention provides a kind of metal flue anti-corrosion method, utilize flexible graphite plate high temperature resistant (450 DEG C of high temperature can be born), acid and alkali-resistance, to gas, liquid medium, there is the characteristics such as excellent impermeability, it is mounted in metal flue fast, and with gap at joint between graphite cement filling flexible graphite cake, at the certain thickness graphite slurry of its surface spraying, ensure that whole corrosion-inhibiting coating has good air-tightness and high temperature resistance sweep of gases ability.
Particular content of the present invention comprises:
(1) metal flue inner surface treatment: cleaning corrosion and attachment, keeps clean, dry, without oil.The mode taking manual polishing and mechanical spray sand facies to combine removes iron rust in metal flue, alkaline cleaner is ejected into metal flue inner surface and removes grease on it, naturally dry, alkaline cleaner comprise NaOH, tertiary sodium phosphate, sodium metasilicate, sodium carbonate, sodium sulphate one or more.
(2) flexible graphite plate is mounted:
(3) respectively at metal flue inner surface and flexible graphite plate brushing one deck adhesive, again the flexible graphite plate scribbling adhesive is pasted onto metal flue inner surface, 25 DEG C of solidification 0.5-1h, between flexible graphite plate, the gap of 1-2mm is left in junction, is convenient to fill graphite cement;
Described adhesive is one or more in epoxy resin, polyurethane, polyvinyl chloride, APEO.
Described flexible graphite plate is suppressed by the expanded graphite of sulfur content <800ppm, chlorinity <20ppm to form, and described soft graphite board size is no more than 1m × 1m, density >1.6g/cm
3, thickness <3mm.
(4) prepare graphite cement with Kai Muluoke adhesive and 100 ~ 300 object crystalline graphite powders with the ratio of 1:1 ~ 1:3, then with scraper, graphite cement is filled in flexible graphite plate bonded joint place, notice that clay is concordant with flexible graphite plate, 25 DEG C of solidification 0.5-1h.
(5) the proportions graphite slurry of 3:1 ~ 5:1 is pressed with epoxy modified silicone resin and 100 ~ 300 object crystalline graphite powders, then high-pressure airless mode is adopted by graphite slurry to be sprayed on flexible graphite plate surface, air pressure is used to be 0.3 ~ 2MPa in airless spraying mode, jet length is 300mm ~ 400mm, and nozzle diameter is 0.15mm ~ 0.22mm.Coating thickness is not more than 0.025mm, places 1-2h at 25 DEG C, makes it solidify.
(6) as required, repeat above-mentioned (2), (3), (4) n time, attachment n layer flexible graphite plate, successively increase graphite slurry thickness simultaneously, every layer thickness <0.0001mm, upper and lower two layers of flexible graphite plate connector staggers mutually, and lower one deck flexible graphite plate seals last layer joint.
The invention provides a kind of metallic conduit anticorrosion method for interior, have the following advantages:
1. high temperature resistant: resistance to 220 DEG C of high temperature for a long time, use in the environment temperature that short-term is 250 DEG C;
2. heat insulation: large 28 times of the thermal conductivity ratio thickness direction in plane layer direction, less in thickness direction heat transfer, decrease the heat trnasfer to metal tube, can be effectively heat insulation, weaken adhesive aging, thus extend the service life of adhesive;
3. anti-permeability: the flexible graphite plate of large density has excellent impermeability to gas, liquid medium, and every layer of graphite cement can play insulating effect;
4. acid resistance: protective layer can stand HCl, HF, SO
2, NO
x, the gas long-term corrosion at high temperature such as CO;
5. anti-sweep of gases: top layer graphite slurry ability high velocity smoke washes away;
6. manufacturability is better: fast attachment, normal temperature cure, construction are simple.
Accompanying drawing explanation
Fig. 1 is interior of metal flue structural representation, wherein, and 1. metal flue inner surface, 2. soft graphite, 3. adhesive, 4. graphite slurry.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.In Fig. 1,1. metal flue inner surface, 2. soft graphite, 3. adhesive, 4. graphite slurry.
embodiment 1
1. clear up on metal flue inner surface before construction, make it to keep clean, dry, without oil.The mode taking manual polishing and mechanical spray sand facies to combine removes iron rust in metal flue, and alkaline cleaner is ejected into metal flue inner surface and removes grease on it, comprising NaOH, tertiary sodium phosphate with mass ratio from alkaline cleaner is that 1:1 mixes.Expulsion pressure is 0.1 ~ 0.2Mpa, and the time is 1.5 ~ 3 minutes, naturally dries.
2. thickness of slab is 2mm, density is 1.6g/cm to utilize the expanded graphite of sulfur content 500ppm, chlorinity 15ppm to be prepared by rolling forming
3flexible graphite plate, be cut into the size of 1m × 1m.
3. be the TH896W-30 type epoxy resin high-temperature Resistance Adhesives of 0.05mm at metal flue inwall and flexible graphite plate external coating a layer thickness, use front hot-water soak, increase adhesive mobility; The flexible graphite plate scribbling adhesive is mounted on metal flue inner surface equably, and beats pressurization with rubber hammer, then at 25 DEG C, solidify 1h.Soft graphite plate connector vacates the wide gap of 2mm, is convenient to be coated with envelope graphite cement.
4. Kai Muluoke 205 and 300 object crystalline graphite powders are mixed with the ratio of 1:2 and be mixed with graphite cement, then in the mode of blade coating, graphite cement is filled in soft graphite plate connector gap, seals concordant with flexible graphite plate, 25 DEG C of solidification 1h.
5. modified organic silicon epoxy resin and crystalline graphite powder are mixed in the ratio of 3:1 and be mixed with graphite slurry, then adopt high-pressure airless mode that graphite slurry is sprayed on flexible graphite plate surface, wherein air pressure is 0.5MPa, jet length is 200mm, nozzle diameter is 0.10mm, coating thickness is 20 μm, 25 DEG C of dry solidification 2h.
6 repetitions, 5 steps 3,4,5, every layer increases graphite slurry thickness <0.0004mm.
embodiment 2
1. clear up on metal flue inner surface before construction, make it to keep clean, dry, without oil.The mode taking manual polishing and mechanical spray sand facies to combine removes iron rust in metal flue, and alkaline cleaner is ejected into metal flue inner surface and removes grease on it, comprising NaOH, sodium carbonate, sodium sulphate with mass ratio from alkaline cleaner is that 1:2:1 mixes.Expulsion pressure is 0.1 ~ 0.2Mpa, and the time is 1.5 ~ 3 minutes, naturally dries.
2. thickness of slab is 2mm, density is 1.6g/cm to utilize the expanded graphite of sulfur content 500ppm, chlorinity 15ppm to be prepared by rolling forming
3flexible graphite plate, be cut into the size of 1m × 1m.
3. be the Aqueous Polyurethane Adhesives of 0.05mm at metal flue inwall and flexible graphite plate external coating a layer thickness, use front hot-water soak, increase adhesive mobility; The flexible graphite plate scribbling adhesive is mounted on metal flue inner surface equably, and beats pressurization with rubber hammer, then at 25 DEG C, solidify 1h.Soft graphite plate connector vacates the wide gap of 2mm, is convenient to be coated with envelope graphite cement.
4. Kai Muluoke 213 and 300 object crystalline graphite powders are mixed with the ratio of 1:2 and be mixed with graphite cement, then in the mode of blade coating, graphite cement is filled in soft graphite plate connector gap, seals concordant with flexible graphite plate, 25 DEG C of solidification 1h.
5. modified organic silicon epoxy resin and crystalline graphite powder are mixed in the ratio of 3:1 and be mixed with graphite slurry, then adopt high-pressure airless mode that graphite slurry is sprayed on flexible graphite plate surface, wherein air pressure is 0.5MPa, jet length is 200mm, nozzle diameter is 0.10mm, coating thickness is 20 μm, 25 DEG C of dry solidification 2h.
6. repetition 8 steps 3,4,5, every layer increases graphite slurry thickness <0.0005mm.
embodiment 3
1. clear up on metal flue inner surface before construction, make it to keep clean, dry, without oil.The mode taking manual polishing and mechanical spray sand facies to combine removes iron rust in metal flue, alkaline cleaner is ejected into metal flue inner surface and removes grease on it, comprises sodium metasilicate, sodium carbonate, sodium sulphate mixes with the mass ratio of 3:2:1 from alkaline cleaner.Expulsion pressure is 0.1 ~ 0.2Mpa, and the time is 1.5 ~ 3 minutes, naturally dries.
2. thickness of slab is 2mm, density is 1.6g/cm to utilize the expanded graphite of sulfur content 500ppm, chlorinity 15ppm to be prepared by rolling forming
3flexible graphite plate, be cut into the size of 1m × 1m.
3. be the APEO high-temperature Resistance Adhesives of 0.05mm at metal flue inwall and flexible graphite plate external coating a layer thickness, use front hot-water soak, increase adhesive mobility; The flexible graphite plate scribbling adhesive is mounted on metal flue inner surface equably, and beats pressurization with rubber hammer, then at 25 DEG C, solidify 1h.Soft graphite plate connector vacates the wide gap of 2mm, is convenient to be coated with envelope graphite cement.
4. Kai Muluoke 219 and 300 object crystalline graphite powders are mixed with the ratio of 1:2 and be mixed with graphite cement, then in the mode of blade coating, graphite cement is filled in soft graphite plate connector gap, seals concordant with flexible graphite plate, 25 DEG C of solidification 1h.
5. modified organic silicon epoxy resin and crystalline graphite powder are mixed in the ratio of 3:1 and be mixed with graphite slurry, then adopt high-pressure airless mode that graphite slurry is sprayed on flexible graphite plate surface, wherein air pressure is 0.5MPa, jet length is 200mm, nozzle diameter is 0.10mm, coating thickness is 20 μm, 25 DEG C of dry solidification 2h.
6. repetition 10 steps 3,4,5, every layer increases graphite slurry thickness <0.0001mm.
embodiment 4
1. clear up on metal flue inner surface before construction, make it to keep clean, dry, without oil.The mode taking manual polishing and mechanical spray sand facies to combine removes iron rust in metal flue, and alkaline cleaner is ejected into metal flue inner surface and removes grease on it, comprising tertiary sodium phosphate, sodium metasilicate, sodium sulphate with mass ratio from alkaline cleaner is that 5:1:0.5 mixes.Expulsion pressure is 0.1 ~ 0.2Mpa, and the time is 1.5 ~ 3 minutes, naturally dries.
2. thickness of slab is 2mm, density is 1.6g/cm to utilize the expanded graphite of sulfur content 500ppm, chlorinity 15ppm to be prepared by rolling forming
3flexible graphite plate, be cut into the size of 1m × 1m.
3. be epoxy resin and the APEO of 0.05mm at metal flue inwall and flexible graphite plate external coating a layer thickness be that 2.3:3.5 mixes obtained high-temperature Resistance Adhesives with mass ratio, use front hot-water soak, increase adhesive mobility; The flexible graphite plate scribbling adhesive is mounted on metal flue inner surface equably, and beats pressurization with rubber hammer, then at 25 DEG C, solidify 1h.Soft graphite plate connector vacates the wide gap of 2mm, is convenient to be coated with envelope graphite cement.
4. Kai Muluoke 220 and 300 object crystalline graphite powders are mixed with the ratio of 1:2 and be mixed with graphite cement, then in the mode of blade coating, graphite cement is filled in soft graphite plate connector gap, seals concordant with flexible graphite plate, 25 DEG C of solidification 1h.
5. modified organic silicon epoxy resin and crystalline graphite powder are mixed in the ratio of 3:1 and be mixed with graphite slurry, then adopt high-pressure airless mode that graphite slurry is sprayed on flexible graphite plate surface, wherein air pressure is 0.5MPa, jet length is 200mm, nozzle diameter is 0.10mm, coating thickness is 20 μm, 25 DEG C of dry solidification 2h.
6. repetition 12 steps 3,4,5, every layer increases graphite slurry thickness <0.0002mm.
embodiment 5
1. clear up on metal flue inner surface before construction, make it to keep clean, dry, without oil.The mode taking manual polishing and mechanical spray sand facies to combine removes iron rust in metal flue, and alkaline cleaner is ejected into metal flue inner surface and removes grease on it, comprising sodium metasilicate, sodium sulphate with mass ratio from alkaline cleaner is that 4:1 mixes.Expulsion pressure is 0.1 ~ 0.2Mpa, and the time is 1.5 ~ 3 minutes, naturally dries.
2. thickness of slab is 2mm, density is 1.6g/cm to utilize the expanded graphite of sulfur content 500ppm, chlorinity 15ppm to be prepared by rolling forming
3flexible graphite plate, be cut into the size of 1m × 1m.
3. be epoxy resin and the polyurethane of 0.05mm at metal flue inwall and flexible graphite plate external coating a layer thickness be that 4.7:1.8 mixes obtained high-temperature Resistance Adhesives with mass ratio, use front hot-water soak, increase adhesive mobility; The flexible graphite plate scribbling adhesive is mounted on metal flue inner surface equably, and beats pressurization with rubber hammer, then at 25 DEG C, solidify 1h.Soft graphite plate connector vacates the wide gap of 2mm, is convenient to be coated with envelope graphite cement.
4. Kai Muluoke 205 and 300 object crystalline graphite powders are mixed with the ratio of 1:2 and be mixed with graphite cement, then in the mode of blade coating, graphite cement is filled in soft graphite plate connector gap, seals concordant with flexible graphite plate, 25 DEG C of solidification 1h.
5. modified organic silicon epoxy resin and crystalline graphite powder are mixed in the ratio of 3:1 and be mixed with graphite slurry, then adopt high-pressure airless mode that graphite slurry is sprayed on flexible graphite plate surface, wherein air pressure is 0.5MPa, jet length is 200mm, nozzle diameter is 0.10mm, coating thickness is 20 μm, 25 DEG C of dry solidification 2h.
6. repetition 2 steps 3,4,5, every layer increases graphite slurry thickness <0.0007mm.
Claims (10)
1. a metal flue anti-corrosion method, is characterized in that, comprises following processing step:
1) metal flue inner surface treatment, the mode taking manual polishing and mechanical spray sand facies to combine removes metal flue inner surface iron rust, alkaline cleaner is ejected into metal flue inner surface and removes grease on it, naturally dry;
2) flexible graphite plate is mounted, respectively at metal flue inner surface and flexible graphite plate brushing one deck adhesive, again the flexible graphite plate scribbling adhesive is pasted onto metal flue inner surface, 25 DEG C of solidification 0.5-1h, between flexible graphite plate, the gap of 1-2mm is left in junction;
3) fill graphite cement, graphite cement is filled in the gap of soft graphite plate connector, 25 DEG C of solidification 0.5-1h;
4) graphite spraying slurry, takes airless spraying mode at flexible graphite plate surface spraying one deck graphite slurry, 25 DEG C of solidification 1-2h;
5) repeat step 2), 3), 4) n time, attachment n layer flexible graphite plate, simultaneously successively increase graphite slurry thickness.
2. a kind of metal flue anti-corrosion method according to claim 1, is characterized in that, step 1) alkaline cleaner comprise NaOH, tertiary sodium phosphate, sodium metasilicate, sodium carbonate, sodium sulphate one or more.
3. a kind of metal flue anti-corrosion method according to claim 1, is characterized in that, step 2) in adhesive be one or more in epoxy resin, aqueous polyurethane, polyvinyl chloride, APEO.
4. a kind of metal flue anti-corrosion method according to claim 1, is characterized in that, step 2) the adhesive bondline thickness of metal flue inner surface and flexible graphite plate brushing is 0.05mm ~ 0.10mm.
5. a kind of metal flue anti-corrosion method according to claim 1, it is characterized in that, step 2) described in flexible graphite plate be by sulfur content <800ppm, chlorinity <20ppm expanded graphite suppress form, described soft graphite board size is no more than 1m × 1m, density >1.6g/cm
3, thickness <3mm.
6. a kind of metal flue anti-corrosion method according to claim 1, is characterized in that, the graphite cement described in step 3) is that Kai Muluoke adhesive and crystalline graphite powder form in the ratio mixed preparing of 1:1 ~ 1:3.
7. a kind of metal flue anti-corrosion method according to claim 1, it is characterized in that, graphite slurry described in step 4) is that modified organic silicon epoxy resin and crystalline graphite powder form by the proportions of 3:1 ~ 5:1, the thickness <0.025mm of graphite slurry, described crystalline graphite powder is 100 ~ 300 orders.
8. a kind of metal flue anti-corrosion method according to claim 1, is characterized in that, the air pressure of step 4) airless spraying is 0.3 ~ 2MPa, and jet length is 300mm ~ 400mm, and nozzle diameter is 0.15mm ~ 0.22mm.
9. a kind of metal flue anti-corrosion method according to claim 1, is characterized in that, n >=2 in step 5), successively increases graphite slurry thickness, every layer of thickness <0.0001mm increased.
10. a kind of metal flue anti-corrosion method according to claim 1, is characterized in that, when mounting two-layer or two-layer above flexible graphite plate, upper and lower two layers of flexible graphite plate connector staggers mutually, and lower one deck flexible graphite plate seals last layer joint.
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| CN105928256A (en) * | 2016-05-12 | 2016-09-07 | 太仓市顺邦防腐设备有限公司 | Concentric-circle sleeve type perpendicular falling film absorber for refrigeration |
| CN106731820A (en) * | 2016-12-30 | 2017-05-31 | 海宁英和金属制品有限公司 | A kind of oxidation-resistant corrosion-resistant sheet metal inside casing |
| CN106853338A (en) * | 2016-12-30 | 2017-06-16 | 海宁英和金属制品有限公司 | A kind of high-strength anti-corrosion sheet metal |
| CN107599533A (en) * | 2017-09-29 | 2018-01-19 | 江苏天时新材料科技有限公司 | Graphite Lining Corrosion Resistant Equipment |
| CN113913079B (en) * | 2021-09-09 | 2022-06-21 | 广州协堡建材有限公司 | Anti-corrosion protective layer for metal plate and preparation process thereof |
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