
High-strength wear-resistant refractory coating is a new type of high-strength wear-resistant refractory functional new material developed by digesting and absorbing the technologies of Foster-WHEELER Company of the United States and Kurosaki Company of Japan and combining the wear characteristics of circulating fluidized bed boilers. It is mainly used for brushing the lining of circulating fluidized bed boilers. It has high temperature resistance, good adhesion, good anti-stripping, good sealing, high strength erosion resistance and wear resistance, and is easy to construct. It adopts modified inorganic composite binder, and is matched with silicon carbide, fused corundum fine powder or high-quality high-alumina vanadium fine powder, composite micropowder, ultrafine powder, high-temperature resistant oxide and other chemical admixtures to form a viscous paste material. Due to the high-temperature erosion and wear of the combustion chamber, furnace outlet, flue, cyclone separator, and mixing chamber of the circulating fluidized bed boiler, the conventional treatment method is to use micro-expandable plastic ramming lining, but it must be strictly baked in the furnace, and the stability is poor, resulting in a significant decrease in strength and wear resistance.
According to the operating conditions and operating characteristics of the circulating fluidized bed boiler, our company uses high-strength wear-resistant and refractory coatings for maintenance and repair at the worn parts. After being used in more than 100 power plants across the country, good results have been achieved. The coating thickness can be 2-3mm during construction, and no baking is required. After high-temperature sintering, a glaze-like protective layer is formed, thereby improving the sealing and wear resistance of the furnace lining.

Its physical and chemical indicators are as follows:
|
Brand/Projects and indicators |
HXNT-1 |
HXNT-2 |
|
|
chemical composition(%) |
AL2O3 |
≥80 |
≥75 |
|
Bulk density (g/cm3) |
110℃×24h |
≥2.75 |
≥2.70 |
|
1000℃×3h |
≥2.75 |
≥2.70 |
|
|
Line change rate after burning (%) |
1000℃×3h |
-0.30 |
-0.30 |
|
Wear resistance cm3 [According to SATM (C-704 standard] |
≤2.0 |
≤4.0 |
|
|
Thermal Conductivity w/m·k |
1.5 |
1.5 |
|
|
Thermal vibration stability (times) (1000℃×water cooling) |
≥30 |
≥25 |
|
|
Refractoriness (℃) |
≥1790 |
≥1750 |
|
|
Maximum operating temperature (℃) |
≥1550 |
≥1500 |
|
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