Pan Granulation sludge

Steps of sludge biological fertilizer production process

1. The treated sludge (domestic sludge, industrial sludge, etc.), proper amount of qualified raw materials such as nitrogen, phosphorus, potassium, filler, etc. are sent to the raw material mixer in proportion to mix evenly.

2. Transfer to the disc feeder and add the evenly mixed material to the rotating disc of the pan fertilizer granulator through the continuous rotation of the disc. Go here for more details in auxiliary machine: 

3. The treated microbial strains are sprinkled on the disc material through the liquid component distributor of the pan fertilizer granulator, so that each particle is coated with microbial strains from the inside to the outside. The rotating disk and its edge have friction and centrifugal effect on the material, and the powder gradually gathers into the sphere. Due to the difference of particle mass, the gravity and centrifugation are different. When gravity and centrifugation increase enough to overcome friction between particles, they are thrown out of the disk, and smaller particles remain in the circle. Fine powder continues to accumulate in the dish.

4. The fertilizer is transported to the biological fertilizer dryer, and the initial drying of the fertilizer is completed by using the large airflow generated by the fan and the low-temperature hot air. Due to the species, the drying temperature is strictly controlled, and the drying temperature is lower than the survival temperature of the species.

5. Transport to the thermal screening separation particles and return the fine particles directly to the disc feeder as the core continues to participate in adhesion of the particles to the ball.

6. Transfer to the secondary biological fertilizer dryer to make full use of the high air volume and micro heat to dry bacterial fertilizer.

7. Transfer organic fertilizer cooler to cooling fertilizer by natural or forced cold air.

8. Transfer to finished product screening machine. The large particles are crushed by the crusher and returned to the disc homogenizer to continue to participate in the ball.

9. A small amount of microorganisms and bacteria are lost on the surface of the particles passing through the dryer, and the microbial species on the surface of the particles are supplemented by the coating machine. 

10. Transfer to automatic packing scale for weighing, packaging and storage.

11. The drying, cooling and workshop dust are treated by cyclone dust collector, dust removal room and wet washing to meet the standard and empty.

Sludge biological fertilizer production line

Advantages of Pan Granulation in fertilizer manufacturing process

The operation is intuitive and the operation of the equipment can be known at any time. If any abnormality is found, it can be adjusted in time.

The particle size depends on the inclination and rotation speed of the disc, which can be adjusted. Therefore, the pan manufacturing process has a wide range of particle size control, strong adaptability and very high granulation rate. The sludge fertilizer manufacturing process has the advantages of short production process, simple structure, less investment and convenient operation, which is suitable for small and medium-sized enterprises.

Pan Granualtion Equipment Working Principle

In the process of compound fertilizer powder processing, there are many factors that affect the granulation rate of disc granulator, but the influence of each parameter is not isolated, but interrelated and included. In NPK chemical fertilizer production line, the relationship between parameters should be adjusted according to the actual situation, so as to achieve the best spherical yield.

Ball forming principle of Pan fertilizer granulator

The disc is mounted at a certain inclination. The material in the rotating disc rolls rapidly with the rotation of the main body of the disc. When it rises to the highest position, it falls vertically under the block of the scraper. 

In the process of rotating the disk, it is squeezed and rolled by the disk wall under the action of centrifugal force. As a result of these all-round mechanical extrusion, rolling, collision, powder materials gathered together, with the help of the surface tension of the liquid phase, the "mother ball" is formed. With the increase of "mother ball", the particles are gradually spheroidized into complete particles, and the strength increases gradually from small to large. 

The granulation process is completed until the particle size of the finished product overflows from the edge of the disc. The disc granulator has a good classification function, so that the powder material grows from the bottom of the disc to the earth, forming particles overflow to the outer disk. 

With the increase of the diameter of the outer disk, the linear velocity of the particles increases suddenly. Particles are rolled and rubbed to form spherical particles. Larger particles are prevented from spilling into the hopper by the discharge plate and then sent to the next process by the belt conveyor.

Pan fertilizer granulator

The chemical fertilizer is also produced in different proportions of different chemical fertilizers. Due to the influence of different fertilizer types, in order to achieve high ball rate, the parameters of fertilizer granulator should be adjusted according to the specific situation, so as to achieve the best granulation effect and improve the production capacity.

Pan Granulation Technology

As a fertilizer granulator which has been used for a long time in chemical fertilizer plant, pan granulator has its unique advantages. In the production of fertilizer granulation, the following factors exist in the particle uniformity.

Structure of pan pan granulator

The disc granulator adopts the whole arc structure, which effectively improves the granulation rate. Combined with non power scraper equipment, it can reduce the accumulation of materials in the granulation process and maximize the use of raw materials. In order to facilitate the flexibility and flexibility of field use, the base is firmly thickened and weighted, without the need for additional anchor screws to fix, which also helps to prevent chassis deformation. The disc granulator is very suitable for field operation, reduces the tedious installation and layout procedures, saves time and improves the work efficiency.

In the granulation stage of NPK fertilizer production line, with the continuous addition of raw materials, under the action of centrifugal force, the manufactured particles fall into the lower belt conveyor through the edge of the plate.

Pan fertilizer granulator

Elements of Pan fertilizer granulator

When the plate granulator processes raw materials, many parameters affect each other. For example, the smaller the diameter of the pelletizing disk is, the lower the disk height is, the larger the inclination angle of the disk is, and the higher the rotation speed is; if the disk height is increased, the inclination angle and rotation speed are higher. The smaller the tilt, the lower the speed.

As a NPK compound fertilizer production equipment, another factor affecting the disc granulator is the tilt angle of the disc. The angle of inclination should not be less than 35 ° during granulation, otherwise the material will stick to the disc and rotate with the disc body. With the increase of inclination angle and rotation speed, the material can avoid accumulating in the lower part without falling and rolling up and down.  More info on pan granulation process, go here with the link.

However, the larger the inclination angle is, the faster the downward rolling speed is, and the smaller the overflow particles are. The most suitable slant point of the disk is related to the diameter of the disk, that is, the slope of the disk decreases with the increase of the disk diameter. 

This is because the end velocity of particles moving along the disk surface increases as the disk diameter increases. In order to avoid the impact and fracture of other particles when the particles are down, the tilt of the disk must be reduced.

Pan Pelletizer Working Principle

The main structure of disc granulator is disc. The disc designed by ShunXin fertilizer granulation plant is thicker, heavier and stronger, and the base design does not need to be fixed with anchor bolts, so the operation is stable. The granulation plate of pan granulator has three sockets, which is convenient for intermittent production and operation, greatly reduces the labor intensity and improves the labor efficiency. The reducer and motor are driven by flexible belt, which can start stably, reduce the impact force and improve the service life of the equipment.

The main motor drives the pulley and belt and drives the pinion through the reducer. The big gears fixed at the bottom of the disc mesh with each other and work in the opposite direction. The large gear is specially designed for mounting on the spindle of the housing adjusting disc to support the work of the whole granulator (in conjunction with the sprayer).

We have designed an automatic cleaning device on the top of the pan to prevent the material from sticking to the wall, thus greatly improving the service life of the pan granulator. With the continuous rotation of the motor and the continuous entry of materials, mass production can be realized.

The disc surface of the disc granulator should be flat and the disc roundness should be high. On the one hand, the CD theme affects the overall beauty of the device, on the other hand, it is also the most important. Only when the roundness and flatness meet the requirements, the equipment can run well, the bottom scraper and side scraper can play a role, fully contact the disc surface and bottom, scrape off the materials attached to the disk surface and bottom, and further form a spherical shape.