How double roller press granulator parameters affect granule strength?

The double roller press granulator is key equipment in modern fertilizer production. Its operating parameters directly impact the final granule strength of the product. Understanding how these parameters influence strength is crucial for optimizing the production process and improving product quality.

1.Roller Pressure

Roller pressure is the most direct factor affecting granule strength. Pressure in double roller press granulators is typically controlled between 20-50 MPa. If pressure is too low (<20 MPa), granules become loose and their strength drops by 30-50%. Conversely, excessive pressure (>50 MPa) can cause accelerated equipment wear.

2.Roller Speed  

Speed affects how long the material is under pressure. The recommended speed range is 8-15 rpm. Speeds below 8 rpm can lead to reduced output. Speeds above 15 rpm shorten the compression time, lowering strength by 20-30%.

3.Roller Gap

The gap size directly affects the forming density. The standard gap is usually 1-3 mm. A gap that's too large leads to insufficient forming, while a gap that's too small can cause material blockage. For every 0.5 mm increase in gap size, granule strength decreases by about 15%.

4.Material Properties  

The optimal moisture content range for the material is 8-12%. The recommended binder addition level is generally 1-3%.

5.Die Parameters  

For the die holes in double roller press granulators, round holes produce stronger granules than irregularly shaped holes. The optimal die hole diameter range is 3-5 mm. A die hole length-to-diameter ratio of 1.5-2.0 yields the best strength.

In summary,scientifically adjusting the parameters of the double roller press granulator can increase granule strength by over 30% while reducing energy consumption by 15%. Regular equipment performance checks are essential to ensure optimal production results.