Brief introduction of compound fertilizer double roller granulation production line
Common fertilizer granulation processes are: drum granulation, disc granulation, roller granulation, high tower granulation. Each granulation process has certain advantages, but the drum granulation production process is limited by its formula The advantages of relatively small size, high output, low investment, short construction period, etc., are favored by many compound fertilizer manufacturers and adopted by more and more compound fertilizer manufacturers. Next, Zhengzhou Huaqiang Machinery will analyze the advantages of the drum granulation production process of compound fertilizer over disc granulation, spray granulation and tower granulation.
1. Rotary drum granulation is also called drum granulation. Rotary drum granulator is a kind of equipment widely used in compound fertilizer production equipment. The formula limit is relatively small. It can also use partial shotcrete, partial ammoniation, more equipment types, 2-3 million can make a production line, the daily output can reach more than 280-400 tons, and the good formula can reach more than 500 tons. The fertilizer granulator is a rotary drum granulator
The ratio of the above two nitrogen fertilizers should not be too high. If the nitrogen is higher than 22, and the concentration is higher than 40, it is difficult to do, because the material is out of water and the drying conditions are difficult to meet the standard at the same time.
2. Basic disc granulation
The process principle of disc granulation is that all raw materials are mixed and then enter the disc for granulation, and the disc rotates to agglomerate the materials into balls. Disc granulation is characterized by simple equipment, low investment and quick start-up. The disadvantage of disc granulation is that it is only suitable for small-scale production, with low efficiency. The daily output is only tens of tons, and the formula is limited, requiring viscous materials, and it is only suitable for low concentration. Different materials can choose different fertilizer granulator machine
3. Shotcrete granulation.
Shotcrete mostly refers to urea shotcrete, which is to spray urea into the compound fertilizer granulation device after melting, reducing the urea crushing link, and connecting the urine pipeline with the urea plant will save costs. Fertilizers dissolve quickly, but most of them are high-nitrogen formulas with a nitrogen content greater than 20. There is no need to use urea from the perspective of cost saving for low nitrogen. The process conditions should also be attributed to the roller, the formula with high nitrogen has low cost and the particle shape is good.
4. High tower granulation
The high tower is to melt the raw materials into a high-temperature molten slurry or into a molten slurry mixture, which is thrown from high altitude, and the surface tension becomes spherical when scattered. Screen again. The particles are less likely to agglomerate because they have less moisture when subjected to high temperature processes. The materials are fully mixed and reflected, and the particles are crystal clear. It looks good. However, it reflects that the material also needs high purity, so the proportion of urea is relatively high for the high concentration formula. In addition: the high tower cost is not suitable for frequent replacement of the formula. There are many materials in a production line process, and frequent replacement of the formula will cause higher costs. It's hard to see practical production technology.
The powder material is continuously and evenly added to the top of the two rolls from the hopper. Under the continuous rotation of the squeeze roll, the powder material is bitten into the two rolls and squeezed into a sheet. Then, it falls off under the action of centrifugal action and the gravity of the sheet material, until the shaping wheel with toothed claws is struck and separated into particles, and then enters the material screen. The powder under the sieve is sent back to the return material, and the particles on the sieve are rolled by the roller to remove the acute angle of the particles, and flow out from the outlet on the sieve into the packaging. The bearing support on the moving side of the roll is equipped with a spring, and the spring is deformed to make the support move in a balanced manner and adjust the distance between the two rolls to maintain the required squeezing pressure.