The application effect of lightweight castable in hot air pipeline is remarkable, which is mainly reflected in the following aspects:

I. Thermal insulation performance

Lightweight castable has the characteristics of low thermal conductivity and low density, which can effectively reduce the heat loss of hot air pipeline and improve the transmission efficiency of hot air. For example, the hot air pipeline mentioned in a patent uses light heat insulation castable as the lining, and the temperature difference between the hot air temperature at the outlet of the air preheater and the inlet of the reactor can be controlled at about 30℃. Compared with the pipeline without light castable, the temperature difference is significantly reduced, and the consumption of fuel oil is reduced by 15%~20%.

II. Convenient construction

Lightweight castable has good fluidity and construction performance. It can be molded by pouring, vibrating or ramming only by adding a proper amount of water or liquid during construction, and the construction process is simple and fast. For example, in the construction of blast furnace hot air pipeline, light castable can be quickly filled into the inner wall of the pipeline to form a uniform thermal insulation layer.

III. Strength and wear resistance

Although the density of lightweight castable is low, its strength and wear resistance are high, and it can withstand the erosion and wear of hot air. Its high temperature performance is excellent, and it is suitable for lining of hot air pipeline. For example, mullite lightweight castable has high refractoriness and low thermal conductivity, which is suitable for thermal insulation of hot air pipeline.

IV. Long service life

The service life of lightweight castable is long, which can reach about 20 years under normal use, and the maintenance cost is low. In hot air pipeline, lightweight castable can effectively resist high temperature and chemical erosion and reduce material loss.

V. Significant energy-saving effect

The hot air pipeline using light castable can significantly reduce heat loss and fuel consumption. For example, in the hot air pipeline system of a blast furnace, the temperature stability of the pipeline is better and the energy saving effect is obvious after using light castable.

VI. Adapting to complex working conditions

Lightweight castable can adapt to complex pipeline shapes and working conditions, such as elbows and forks of hot air pipelines. For example, the temperature control is more stable and the service life is longer when light castable is used in the sancha area of hot air pipeline.

VII. Summary

The application effect of lightweight castable in hot air pipeline is remarkable, which can effectively improve thermal insulation performance, reduce heat loss and fuel consumption, and at the same time, it is convenient to construct, has a long service life and adapts to complex working conditions. It is an ideal thermal insulation material.