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Selection of Fertilizer Drying Machine: Rotary Drum Dryer

Drying is an indispensable procedure in the fertilizer production process that directly affects quality, energy consumption, and yield. With the help of a rotary drum dryer, Fertilizers can be dried with a moisture content of approximately 80% to 13%, which is a perfect machine for drying chemical fertilizers.

Which fertilizers need to be dried?

In the fertilizer manufacturing process, all sorts of chemical fertilizers want to be dried, such as nitrogen fertilizer, phosphate fertilizer, potash fertilizer, compound (NPK) fertilizer, compost fertilizer, natural fertilizer, etc.

What is the manufacturing method of fertilizer?

  1. Fertilizer crushing and granulation: The uncooked substances are stirred and crushed, then fed into the disc granulator for granulation.
  2. Granule drying: Feed the particles into the rotary drum dryer.
  3. Granule cooling: The temperature of dried fertilizer granules is too excessive and convenient for caking. After cooling, it is handy for bag storage and transportation.
  4. Particle grading: The cooled particles are graded so that unqualified particles can be overwhelmed and re-granulated, whilst the certified merchandise can be screened out.
  5. Coating and packaging of prepared products: The certified merchandise is covered and saved in bags.

Why dry fertilizers?

The granulated fertilizer granules have excessive moisture content material and are pretty humid. Moreover, the particles are without difficulty overwhelmed by using hands with low strength, which does now not meet the necessities of packaging and transportation. Therefore, the fertilizer wants to be dried after granulation for water content material discount and 2nd granulation.

Water Content Material Reduction

The exceptional index of fertilizer requires that its water content material must be decreased by 14%, however, the water content material of the granules after granulation normally exceeds the index, so a rotary drum dryer is required for drying. The dryer can dry the fertilizer with a moisture content material of 70% – 80% to 13%, which meets the necessities of fertilizer exceptional indicators.

Second Granulation

The dryer no longer solely has the feature of drying, however, additionally has secondary granulation. Dryers can enhance the authentic moisture solubility of natural fertilizer by growing the temperature. With this liquid phase, natural fertilizers are effortless to be pelleted with precise viscosity, so the pellet formation price is excessive with uniform particle size and low water content, which improves manufacturing yield.

Advantages Of Fote Rotary Drum Dryers

High Drying Rate

The heat and mass switch of the moist film on the cylinder wall is from the interior to the outdoor with a steady path and massive temperature gradient, so the floor of natural fertilizer keeps an excessive evaporation intensity, commonly up to 30-70 kg/(m2.h).

High Heat Utilization

As the rotary drum dryer is a heat conduction machine and the heat-transfer direction is essentially regular throughout the heat-transfer cycle, so, most of the heat provided in the rotary drum is used for the moisture vaporization of substances and the thermal effectivity is up to 80% – 90%.

Stable Quality of Fertilizer

Because the heating mode is handy to control, the temperature interior of the cylinder and the warmth switch charge of the partition can be stored exceedingly stable. As the fabric is dried underneath the warmth switch state, the best fertilizer can be guaranteed.

Strong Thermal Insulation of Barrel

Cylinder insulation substances consist of the composite silicate insulation coating, silicate fiberboard, mineral wool board, and so on. We additionally use wire mesh to improve the insulation layer. After the heat upkeep of the cylinder physique is implemented, due to the discount of physique heat dissipation, the temperature of the internal wall rises, and the temperature drop of the warm air slows down, thereby accelerating the heat switch pace and enhancing the warmth switch efficiency.

4 Issues Need to be Paid Attention to in The Manner Of Drying Fertilizer

The Dwelling Time of Fertilizer in The Rotary Dryer

The dwelling time of natural fertilizer in a rotary dryer is typical> 22 min. Under equal conditions, the longer the dryer barrel is, the longer the fabric stays, and the greater the thermal strength utilization price is. Therefore, lengthening the dryer cylinder is very really helpful to make full use of heat energy.

The Temperature Of The Rotary Dryer

In order to keep away from the demise of fine stay microorganisms due to excessive temperature all through the drying process, the drying temperature of compound fertilizers ought to no longer be greater than 60℃. The temperature of the warm air in contact with the fabric usually does now not exceed 130°C.

For example, the decomposition temperature of urea is 132°C, and its softening temperature is 80°C. When producing compound fertilizer with urea as the nitrogen source, it is safer to manipulate the head temperature of the rotary dryer beneath 160°C and the tail section to 70°C to stop the decomposition and softening of grain deformation of urea.

Air Extent Of The Dryer

The air extent without delay impacts the drying effect. It is usually calculated through the cross-sectional region of the dryer barrel, and 7000 m/h is appropriate. Wind velocity must be much less than 2m/s. A manage valve needs to be set up on the pipeline earlier than or after the fan to regulate the air volume.

For example, the blower needs to be outfitted with a valve at the air inlet, which can expand the air extent of the blower to extend the temperature in the furnace when the furnace temperature is insufficient; as nicely as decrease the air extent to decrease the temperature in the furnace if the temperature is too high.

Degree Of Warmth Changes Inside The Rotary Dryer

Organic fertilizers are convenient to soften and stick to the wall at excessive temperature, it will increase the load of the equipment, so the lifting characteristic of the plate in the rotary dryer can’t be entirely exerted and the impact of heat trade is reduced. The cloth will be difficult to be dried and round. Equipment cleansing difficulties will additionally occur. At this time, the format density of the copy board, the lifeless perspective, and the influence of the exterior vibration hammer can be reduced.

Final Words

After reading the above-written points, hope you understand how you can select the fertilizer dryer machine. Apart from this, if you want to ask something about the rotary drum dryer, you can ask us in the comment section.

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