What are the different ways of gunning refractory

1. Wet gunning is a method of mixing refractory aggregate, binder and additive with water to make slurry with certain consistency, and then spray the slurry onto the gunning surface with compressed air through gunning machine. It is characterized by simple operation, high adhesion and rapid sintering. However, due to the large water content and fine grain size, the shrinkage is also large. At the same time, due to the thin gunning layer, the durability is not very good.

2. Semi dry gunning is a method of mixing refractory aggregates, binders, additives, etc. with water through the water ring hole at the atomizing end of the spray gun, and the compressed air is sprayed onto the gunning surface. The amount of water can be adjusted at any time according to the gunning condition, and generally fluctuates between 10? 20%, which is much lower than that of wet gunning. Therefore, the gunning layer has large bulk density and small shrinkage, and can obtain thick gunning layer with good durability, but the rebound is slightly higher than that of wet method, so this gunning method is widely used.

Three Flame gunning is a repair method in which the mixture of refractory aggregate, flux or heating agent is transported to the nozzle by compressed oxygen, mixed with high calorific value fuel, and the surface of refractory aggregate particles is instantly heated to molten or semi molten state, and then sprayed and adhered to the furnace lining. The gunning layer obtained by this construction method has compact structure, high strength, strong corrosion resistance and erosion resistance, Solid and durable. However, the cost of flame gunning device is high, the technology is complex, and the construction energy consumption is also large.

What are the different ways of gunning refractory

1. Wet gunning is a method of mixing refractory aggregate, binder and additive with water to make slurry with certain consistency, and then spray the slurry onto the gunning surface with compressed air through gunning machine. It is characterized by simple operation, high adhesion and rapid sintering. However, due to the large water content and fine grain size, the shrinkage is also large. At the same time, due to the thin gunning layer, the durability is not very good.

2. Semi dry gunning is a method of mixing refractory aggregates, binders, additives, etc. with water through the water ring hole at the atomizing end of the spray gun, and the compressed air is sprayed onto the gunning surface. The amount of water can be adjusted at any time according to the gunning condition, and generally fluctuates between 10? 20%, which is much lower than that of wet gunning. Therefore, the gunning layer has large bulk density and small shrinkage, and can obtain thick gunning layer with good durability, but the rebound is slightly higher than that of wet method, so this gunning method is widely used.

Three Flame gunning is a repair method in which the mixture of refractory aggregate, flux or heating agent is transported to the nozzle by compressed oxygen, mixed with high calorific value fuel, and the surface of refractory aggregate particles is instantly heated to molten or semi molten state, and then sprayed and adhered to the furnace lining. The gunning layer obtained by this construction method has compact structure, high strength, strong corrosion resistance and erosion resistance, Solid and durable. However, the cost of flame gunning device is high, the technology is complex, and the construction energy consumption is also large.