Flash dryer is a kind of high-efficiency drying equipment widely used in chemical, food, mining and other industries. Its characteristic is that it uses high-speed hot air flow to evaporate the moisture of wet materials instantly. In large-scale industrial production, a stable high-temperature heat source is crucial, and pulverized coal furnace has become an ideal supporting heat source for flash dryer due to its high calorific value, high combustion efficiency, and precise temperature control.

Xinjiang Mining Company processes kaolin (a mineral raw material used in ceramics and papermaking). It originally used a coal-fired chain furnace to provide hot air, but faced the following problems:

1. Low thermal efficiency: The traditional combustion method has high coal consumption and large fluctuations in hot air temperature (±30℃), which affects the uniformity of drying.

2. Serious pollution: Insufficient coal combustion, excessive sulfur content and dust in flue gas, and substandard environmental protection.

3. High labor cost: Frequent coal addition and slag cleaning are required, and the operation intensity is high.

Optimization solution for pulverized coal furnace

The company introduced a high-efficiency pulverized coal combustion system, which is used in conjunction with a flash dryer. Its core advantages are as follows:

1. High thermal efficiency

The pulverized coal furnace adopts suspended combustion technology, and the pulverized coal particles are fully mixed with air, with a combustion efficiency of more than 98%. The hot air temperature is stable at 600-800℃ (adjustable), which meets the needs of the flash dryer to instantly evaporate water.

2. Energy saving and environmental protection

The pulverized coal burns completely, saving 20%-30% of coal compared to traditional coal-fired furnaces, and reducing waste slag emissions. Equipped with multi-stage dust removal + desulfurization devices, the flue gas emissions meet the national ultra-low emission standards.

3. Automatic operation

Fully automatic pulverized coal conveying, ignition and combustion control, without manual intervention, reducing the number of operators by 50%.

Effects

Improved drying efficiency: The processing capacity of the flash dryer has increased from 5 tons/hour to 8 tons/hour, and the unit energy consumption has been reduced by 25%.

Product quality optimization: The qualified rate of moisture content of kaolin finished products has increased from 85% to 99%, and the market competitiveness has been enhanced.

Environmental compliance: Flue gas emissions meet the standards, and the company successfully passed the environmental inspection.

Conclusion

The pulverized coal furnace has become an ideal heat source for flash dryers due to its high thermal efficiency, low pollution, and automation. This case proves that in high-temperature drying fields such as minerals and chemicals, the use of pulverized coal combustion systems can significantly improve production efficiency, reduce operating costs, and meet stringent environmental requirements.