Secret of hot air in three return sludge drying machine

Friends who have a certain understanding of the thermal drying technology all know that the normal operation of the sludge drying machine can not be separated from the supply of heat source. Its basic principle is to evaporate the moisture in the sludge by contacting the hot air provided by the fuel energy with the sludge. So what little knowledge about the hot air of drying machine, please continue to look down.

1. Contact mode between sludge and hot air

According to the different contact modes of hot air and sludge, it can be divided into direct contact heating and indirect contact heating. The paddle dryer is a typical indirect heating type. The hot air is transferred to the drying materials through the metal wall, which is suitable for drying materials with small output and low viscosity. The direct heating equipment can increase the drying speed and heat utilization rate by the method of direct contact between materials and hot air. For example, the "rotary harrow three cylinders multiple-loop" sludge dryer is a typical direct heating equipment, which has the characteristics of large output, small heat loss and stable performance. It can be used for drying high humidity and high viscosity sludge, solid waste and hazardous waste sludge.

2. Flow direction of sludge and hot air

According to the different direction of hot air and sludge, it can be divided into the following two ways: forward flow drying and counter current drying. Downstream drying means that sludge and hot air go in the same direction, which can quickly evaporate a large amount of water in sludge. Countercurrent drying means that sludge and hot air go against each other, which can increase the disorder and evaporate the internal moisture in the sludge. For now. The traditional single drum drying machine generally adopts the way of forward flow drying, while the more popular three return way sludge drying machine adopts the "forward flow" + "counter current" + "reciprocating" drying mode, which has more advantages in drying effect.

In addition, we would like to remind you that when selecting heat sources, we should consider the characteristics of their own materials, the convenience, cleanliness and economy of fuels. At present, our company has launched a variety of heat sources, such as natural gas, coal-fired, fuel oil, boiler exhaust, steam, biomass fuel and other combustible gases. Welcome consultation by call.