Introduction to Petroleum Proppant Process (II)

calcination

The pellets enter the rotary kiln with a certain slope for calcination. With the rotation of the rotary kiln, the pellets roll towards the kiln head. At the same time, the pulverized coal is sprayed into the kiln from the kiln head for combustion. The pellets are calcined into ceramsite sand with high strength in the rotary kiln.

The pulverized coal burner can adopt single duct coal injection pipe, which is simple and reliable and has high primary air volume; Multi duct burners can also be used. The primary air volume can be reduced to 8% of the air volume required for pulverized coal combustion, which increases the secondary air volume into the kiln and has significant energy saving effect. The multi duct burner is divided into external axial flow air, coal air, internal axial flow air, etc. The flame shape is very easy to adjust.

The measurement of pulverized coal can adopt rotor type measuring scale or Coriolis force scale to accurately control the coal quantity and stabilize the thermal system in the kiln.

Pulverized coal preparation

Pulverized coal can be prepared by ball mill or vertical mill, and hot air can be drawn from the kiln hood to dry pulverized coal. The dynamic powder concentrator can adjust the fineness of pulverized coal at will, providing conditions for full combustion of pulverized coal.

Finished product cooling

Rotary cooler is generally used for the cooling of ceramsite sand, which is simple and reliable. The secondary air of the cooler is completely fed into the kiln. The use of multi-channel burner can save a lot of energy consumption. The temperature of ceramsite sand out of the cooler is very low, which can be grasped by hand.

screening

The ceramsite sand discharged from the cooler can be directly transported to the multi-stage vibrating screen, which can be divided into multiple particle size grades as required.

Specifications of ceramsite sand products

Type I 0.45-0.9mm (20 mesh - 40 mesh) high strength medium density

Type II 0.9 － 1.25 mm (16 － 20 mesh) high strength medium density

Type III 1.0-1.70mm (12-18 mesh) high strength medium density

Type IV 0.224-0.65mm (40 mesh - 60 mesh) high strength medium density

Large pieces are returned to the raw material crushing process.