Aug. 20, 2018
The wind speed in the tertiary air duct of the rotary kiln is high, and the chlor-alkali gas carrying a large amount of dust in the cooling machine runs at high speed in the tertiary air duct, causing severe scouring of the tertiary air duct, especially at its Y-shaped parts and elbows and at the closing valve. Corrosion with chlor-alkali causes loosening and flaking of refractory materials. In this area, calcium silicate board is usually used as thermal insulation material. Due to its characteristics, high temperature calcium silicate board can reduce energy consumption and improve furnace efficiency, and the effect is remarkable.
The characteristics and effects of high temperature calcium silicate board are as follows:
1. High temperature calcium silicate board has low thermal conductivity
The porosity of the calcium silicate board is over 90%, and the thermal conductivity is small. Therefore, the heat loss on the surface of the preheater is obvious, the output is effectively improved, and energy saving is achieved.
2. High temperature calcium silicate board’s working temperature is high and density is low.
High temperature calcium silicate board’s working temperature is 1100℃。Its density is low, so its service life is long.
3. The construction process is flexible and convenient
During the construction process, workers can cut high-temperature calcium silicate boards into various shapes according to the design requirements of the kiln. The construction process is also simpler than refractory bricks and refractory castable。So it saves time.
4. Durable and safe to use
High temperature calcium silicate board contains no harmful substances. It is flame retardant under high temperature, corrosion resistant, and its thermal insulation performance is superior to other insulation products. The use of calcium silicate boards at the end of the kiln provides significant technical and economic benefits.
Construction requirement of high temperature calcium silicate board.
The applying of high temperature calcium silicate board must meet two requirements: to meet the heat insulation and prevent the entry of alkaline gas into the shell; the surface must be smooth and flat to meet the requirements of refractory brick masonry.