epoxy coating construction:
China national electric Yuanbaoshan Electricity generation limited liability company 2 machine set denitration SCR inlet gas flue Ammonia Injection Grid
wainscot from machine set putting into operation until now,it has already continuously ran for about 7 years,this part often takes place abrasion and leakage,
the direct result causes abrasion of spraying ammonia flow equalizing plate,air pre-heater blocking intensify,power consumption of induced draft fan increasing
and ammonia consumption quantity increasing,in order to avoiding reentrainment of dust to pollute field environment,must do the abrasion resistant treatment
for SCR inlet gas flue Ammonia Injection Grid wainscot to eliminate leakage,it can ensure SCR gas flue long period stable operation.
This part operation environment temperature is 0-450 degree,the dust concentration of gas flue is about 60g/Nm3,gas flue flow rate is 15m/s,
the wear resistant layer can ensure at least more than 5 years’ working life,denitration system SCR inlet gas flue Ammonia Injection Grid wainscot
abrasion protective project,should do the deposition cleaning before blowing out,the wear protective surface is smooth after construction,abrasion
resistant coating thickness has no obvious influence for operating,it won’t fall off for long-terms using, the highest flue gas temperature from the parts
of economizer outlet to SCR inlet gas flue elbow is about 376 deg C,so we choose BD766 boiler gas flue high temperature anti wear abrasion resistant
coating to ensure construction quality,we could make sure that the service life of abrasion resistant coating is more than 5 years after delivery,during the
working life,it won’t appear coating falling off conditions.
The features of BD766 high temperature wear abrasion resistant coating:
BD766 high temperature anti wear abrasion resistant coating is based on many years’R&D and production experience in the filed of inorganic high
temperature resistant adhesive by Xiangyang City hundred Shield Coating,take advantage of inorganic materials for production,break through the temperature
limit of organic coating,this coating is two components,fine particle,room temperature curing,abrasion wear resistant,the highest temperature resistant can reach
to 600 deg C,it is exclusively used in gas flue abrasion resistant repairing.
1.With excellent performance of wear resistant and corrosion resistant,with high bonding strength to metal substrates.
2.Construction is convenient,without very high technical requirements for the constructors
3.It is suitable for the protection of high temperature wear abrasion working conditions.
4.Facade and ceiling can both be blade coating directly,don’t flow and slip,don’t need supporting.
How to use:
1.Surface treatment: Do coarsening treatment on the pending-repair part,grinding with angle grinder or sand blasting etc,the surface after coarsening
treatment should be cleaned,the surface after this treatment should be the one coarsening,dry and fresh substrates,should be no greasy dirt and dust.
2.Preparation: According to mixing weight ratio A:B=4:1,make A and B two components mix uniformly,and use it up within 40 min.Generally it’s while
construction and configuration.Every time the largest preparation quantity is not more than 2Kg,too much adhesive is solidified too fast,hasn’t been used up
until the adhesive has partial solidified and can’t be used.According to the actual temperature,configuration can be properly a little more in winter and proper
less in summer.
3.Coating: The suitable coating thickness of BD766 is 1-10mm.Should make the well mixed material be coating on the pending-repair part layer by layer,
the first layer should be compacted,make it infiltrates fully with the substrates.The thickness of each layer should be controlled under 0.5£1mm,spread
coating the next layer after the upper layer drying,the application time of coating for two successive is depend on the construction temperature and coating thickness,it's more than 10 hours in winter based on 0.5mm coating thickness,but more than 4 hours in summer.The principle which we should grasp is that
coating on the next layer after the upper layer drying.
4.Curing:After the coating is coated in the specified size,generally we need to place it for 2-3 days before putting into use.Every time the coating increases
thickness for 1mm,the curing time should be prolonged for a day.
