Advantages of disc granulator in processing agricultural straw to produce fertilizer
At present, the utilization of agricultural straw is very low whether it is returned to the field as fertilizer or as feed, causing serious waste. The development of bioengineering technology makes use of biotechnology to produce bio-organic fertilizer through the biological fermentation of straw, human and livestock manure, which can not only improve crop yield, but also reduce pollution, ecological and environmental protection, and produce green products.
Disc granulator (also known as spherical disk), the granulation disk is of integral arc structure, with high granulation rate. The granulation disk is equipped with three discharge ports, which are convenient for intermittent production operations, reduce labor intensity and improve labor efficiency. The reducer and motor are driven by flexible belt, which can start smoothly, reduce the impact force and improve the service life of the equipment. The bottom of the granulation disk is strengthened by multiple radial steel plates, which are firm and durable without deformation. The thickened, weighted and solid base design, It is an ideal equipment for granulating organic fertilizer and compound fertilizer without fixing with anchor bolts and running smoothly.
The raw meal powder is uniformly wetted by atomized water in the two-shaft mixer to form a ball core with uniform particle size, and then sent to the balling plate for balling. The moisture content of the pellets shall be controlled at 12~14%. Most of the water should be added in the twin-shaft mixer, and only a small amount of make-up water should be added in the disc granulator. The make-up water should be controlled at about 0~3%. The dry powder granulation is directly added to the pelletizing plate and sprayed with appropriate water. After entering the pelletizing plate, the raw material ball core moves along the parabola under the action of centrifugal force, friction and gravity.
Due to the cohesiveness and plasticity of the material, the ball and core bond with each other and grow up gradually in the process of movement. When the parameters of the disc granulator such as inclination angle, disc edge height, rotating speed and moisture are specific, the pellets with different particle sizes roll downward from the disc edge at different separation angles due to different gravity. In the continuous rolling process, the water in the ball is continuously drained out of the surface. Due to the cohesiveness of the material and the natural volatilization of the liquid film on the surface, the ball has strength and is discharged from the edge of the disk with the rotation of the tilting disk.