desulfurization absorption tower and slurry pipeline special anti wear corrosion resistant protective coatings
Power plant desulphurization system wear resistant anti corrosion construction scheme:
With the development of national economy and the improvement of national environmental protection consciousness,people has higher requirements for the quality of the atmosphere.Thermal power plant acts as one of the main SO2 emission sources,faced the pressure of environmental protection is becoming larger and larger,the implementation of power plant flue gas desulfurization is imperative.The mainly flue gas desulfurization technology has dry process desulphurization, half dry method desulphurization and wet desulphurization in the world at present.And wet desulphurization based on its high desulfurization efficiency,reliable & stable operation and without secondary pollution has been widely applied.In developed countries,more than 90% of the flue gas desulfurization uses the wet desulphurization technology,most of the flue gas desulfurization based on Chinese coal-fired power plant uses the wet desulphurization technology.
In wet desulphurization system,the abrasion and corrosion of the chimney has a great influence on the desulfurization system and the reliability and security of the unit.Currently widely used wear resistant anti corrosive construction scheme based on the material itself quality,construction quality and other reasons caused the crack,bulge,erosive wear,fall off and acid liquor leakage etc. problems.
1.In the whole wet desulphurization system,the flue gas and slurry both have certain corrosivity,so the lining material should have excellent corrosion resistant performance.
2.in the desulfurization system,when the equipment stops operating,the highest temperature can reach to 120 -150 ℃,so the equipment lining material should have excellent temperature resistance and water resistance.
3.Due to the impurities particle etc. in the slurry circulation systems,the medium flows in a high speed,scour the equipment,cause the abrasion and cavitation etc.to the equipment, so we usually make a layer of wear resistant coating on the inner wall of the pipeline.
4.Due to the medium of high speed flowing, cause the great shearing force and pressure to the materials,so the material should have a very high ontology strength,and have good bonding strength to the substrates.
Composite these conditions together,few product can satisfy at the same time at present.Xiangyang Hundred Shield Coating Material Co.,Ltd is based on the customers' feedback information,trial and error,summed up a set of effective construction technology.
First:Surface treatment
First clean up the rusting,dirt and other impurities on the surface of the substrate,and do the sand blasting,grinding and other coarsening processing.Make the construction part be clean,dry and without pollution,in order to achieve the ideal bonding effect.
Second: The preparation of the undercoat of high temperature resistant corrosion resistant coatings
According to the mass ratio 4:1,make the BD427 high temperature anti corrosive coatings mix uniformly,smear it on the pending-repair part,according to the criss cross method,smear for two times,the most suitable coating thickness is 0.3mm.And then paste a layer of glass fiber cloth on the surface of the coatings.Smear two layers of the BD427 high temperature corrosion resistant coatings on the surface of the glass fiber cloth according to the criss cross method.And then paste a layer of the glass fiber cloth on the surface of the BD427 coatings.Smear 2 layers of the BD427 high temperature anti corrosion coatings on the surface of the glass fiber cloth again.(The thickness of three layers coatings and two layers the glass fiber cloth is about 2 mm)
1.Every time the most quantity of configuring adhesives is not more than 2Kg,and use it up within 30 min,in order to avoid the adhesives curing to cause the waste.
2.Should mix it uniformly during mixing,the coatings should be compacted during smearing,avoid appearing bubbles,cause the adhesives to appear the holes after curing.
3.When the temperature is low,the viscosity of the BD427 coatings is high,can heat the A component in water bath separately first to reduce the viscosity.
4.The BD427 high temperature corrosion resistant coatings both have the excellent bonding strength and good high-temperature & corrosion resistance.The glass fiber cloth can enhance the cracking resistant performance of the coatings,for some parts of the ligher abrasion corrosion and lower temperature resistant requirements,we also don't have to paste the glass fiber cloth.
Third: The preparation of high temperature resistant flakes corrosion resistant coatings:
After the second layer of the BD427 high temperature corrosion resistant initial curing,(must before the BD427 coatings complete curing),according to the mass ratio 4:1,make the BD428 high temperature flakes corrosion resistant coating mix uniformly,smear it on the surface of the BD427 coatings,the coating should be compacted along one direction to avoid appearing holes.(the thickness of the coatings is about 3mm)
1.Every time the most quantity of configuring adhesives is not more than 2Kg,and use it up within 30 min,in order to avoid the adhesives curing to cause the waste.
