Technical principle: The traditional spray tower produces granular small particles of urea as seed crystals, and is added to the fluidized bed granulator. After coating, the small particles of urea are formed into spherical large particles of urea, which are then sieved and cooled. Particles with a particle size of 2 to 4 mm are used as products, and the remaining particles smaller than 2 mm and larger than 4 mm are pulverized and returned to the fluidized bed to regenerate the dust-containing urea tail gas from the large-particle urea granulator to be absorbed by water, and the absorption liquid reaches a certain concentration. After returning to the original evaporation system to concentrate.
Performance index: The original Toyo process reaches the index. The process achieves the index of 2~4mm. 93%wt 93%wt
Crushing strength 20～22N 24N
Biuret 0.9%wt 0.72%wt
Moisture 0.35%wt 0.3%wt
Spherical particle ratio 25% wt 75% wt
Creativity and advancement of technology: Creativity: Small particles with an average particle size of 1.65 mm are produced by using the original device granulation tower as a variety to be added to the fluidized bed to produce spherical large-grain urea, which greatly improves the appearance of the product, and at the same time The crusher load, the amount of dust entering the granulated fairy has also been reduced, and the danger of a dead bed in the bed is prevented. Improve the operating cycle. This kind of spraying causes the granular tower and fluidized bed granulator to jointly produce spherical large particle urea to fill the domestic blank. The capacity of the device has exceeded the designed 2000T/D scale, reaching 2400T/D, and NH3O4 in the exhaust gas meets environmental protection requirements. The process has been optimized, the localization rate of equipment is å–§89%; the key equipment has been modified; the interlocking system is optimized. The maturity, scope of application and safety of the technology: After the project is put into operation, it can be operated stably and safely, and it is applied to the plant that produces small granular urea by using the traditional spray granulation tower to produce small granular urea. Application and existing problems: After the project was put into operation, the sales situation was greatly improved, and no problems were found.
Performance index: The original Toyo process reaches the index. The process achieves the index of 2~4mm. 93%wt 93%wt
Crushing strength 20～22N 24N
Biuret 0.9%wt 0.72%wt
Moisture 0.35%wt 0.3%wt
Spherical particle ratio 25% wt 75% wt
Creativity and advancement of technology: Creativity: Small particles with an average particle size of 1.65 mm are produced by using the original device granulation tower as a variety to be added to the fluidized bed to produce spherical large-grain urea, which greatly improves the appearance of the product, and at the same time The crusher load, the amount of dust entering the granulated fairy has also been reduced, and the danger of a dead bed in the bed is prevented. Improve the operating cycle. This kind of spraying causes the granular tower and fluidized bed granulator to jointly produce spherical large particle urea to fill the domestic blank. The capacity of the device has exceeded the designed 2000T/D scale, reaching 2400T/D, and NH3O4 in the exhaust gas meets environmental protection requirements. The process has been optimized, the localization rate of equipment is å–§89%; the key equipment has been modified; the interlocking system is optimized. The maturity, scope of application and safety of the technology: After the project is put into operation, it can be operated stably and safely, and it is applied to the plant that produces small granular urea by using the traditional spray granulation tower to produce small granular urea. Application and existing problems: After the project was put into operation, the sales situation was greatly improved, and no problems were found.
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