How to prevent scarring on the inner wall of a urine-based high tower
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A few days ago, our plant used a high tower to produce 26-14-10 urea-based compound fertilizer. The temperatures in the first and second stages were in the high 100s degrees, while the temperatures on the inner and outer circles of the nozzles were between 32 and 37 degrees. The production rate was around 25 units per shift. Severe scarring on the inner walls occurred, with the scarring reaching a height of about 50 meters; our spraying height was 80 meters. In the past two days, the scarring on the tower walls has started to fall off, damaging the receiving disk at the bottom of the tower. How can I avoid material buildup on the tower walls? What should be done if material accumulates on the tower wall?
The appropriate granulation temperature should be determined, and then the suitable rotation speeds for the nozzles, both inside and outside the tower, should be adjusted based on the inner diameter of the tower; on-site measurements are required
Oh, have you encountered material buildup on the tower walls? How do you deal with it? We moisten it with water now to let it fall off on its own; we don’t dare wash it directly with water, otherwise we can’t control the flow of water, and it’s too slow – not much has fallen off after several days.
Too rapid outward rotation causes sticking to the wall; to address this, the only solution is to hang a basket at the granulation nozzle, with a person standing in the basket and using water to spray the wall of the tower so that the substance can gradually fall off
I fully agree with the expert’s opinion on the second floor. Apart from controlling the appropriate granulation temperature, the material buildup on the inner wall is mainly caused by an excessive nozzle speed. Therefore, it is essential to strengthen the control of the nozzle speed to prevent the slurry from coming into contact with the inner wall.
Excessive external rotation leads to sticking to the wall; depending on the distribution of materials at the bottom of the tower, reducing the external rotation appropriately can compensate for the effects of this reduction by increasing the speed of internal rotation； The humidity here is high; if the equipment is shut down for maintenance for two days, the material stuck to the tower walls will gradually fall off.
Material properties such as particle size, viscosity, and flow rate all have an impact.