TONGLI 150,000-300,000 tons/year high tower compound fertilizer production line adopts urea melting prilling process and high tower granulation technology to process various raw materials (such as nitrogen, phosphorus, potassium, etc.) into compound fertilizer granules.

PRODUCTION LINE EQUIPMENT LIST

High tower fertilizer cooler

It is mainly used to cool the high-temperature particles that have just been sprayed to room temperature. The particles can be cooled in a short time by contacting with air or cooling medium to exchange heat, avoiding adhesion, softening or deformation, and ensuring stable product quality.

High tower coating machine

Used to coat the particles. By coating a layer of film (such as silicone oil, anti-caking agent, etc.), the coating machine can effectively prevent the adhesion between fertilizer particles, improve the moisture resistance and durability of the particles, increase the dissolution rate of the fertilizer, and enhance its release effect in the soil.

High tower screener

Separate particles of different specifications. Through the rotating screen, the particles are classified according to size during the screening process. Qualified products enter the cooler for cooling, and those with unqualified strength will be returned to the crusher for re-granulation.

High Tower Fertilizer Produciton Line ADVANTAGES

High-tower compound fertilizer has high output. The height of domestic high towers is generally between 120 meters and 128 meters, and the annual output can reach about 250,000 tons to 300,000 tons.

The process route is short, the high tower melting process is adopted, the number of equipment is small, the degree of automation is high, and the production efficiency is significantly high.

Rapid dissolution: The granules are easily soluble in water, which improves the efficiency of nutrient release and promotes rapid absorption by crops

The product quality is stable, and the fertilizer produced is very stable in both composition and strength, and is not easy to stratify.

The compound fertilizer produced by the urea melting process is the real compound fertilizer. After the urea is melted, it is quickly cooled and crystallized, and the granules are more uniform in composition and more beautiful in appearance.

Small investment and small land occupation. The equipment required for a high tower compound fertilizer production line (excluding raw material warehouse and finished product warehouse) occupies about 20 acres, and the investment cost is lower.

Reduce volatilization: The high tower granulation process reduces nitrogen volatilization loss and improves nitrogen fertilizer utilization.

Slow-release effect: By adjusting the particle structure, the slow release of nutrients can be achieved to prolong the fertilizer effect.

High Tower Fertilizer Granulation PROCESS

zhejiang tongli heavy machinery high tower prilling Urea ssp compound fertilizer production line solution process flow

Raw Material Processing

Raw materials such as urea, monoammonium phosphate, potassium chloride, potassium sulfate, ammonium chloride, ammonium sulfate and additives are transported manually to the feeding port in the pit, and the raw and auxiliary materials are put into the pit through the feeding port for temporary storage. The raw material metering configuration of this project adopts a computer automatic batching system. Each raw material is equipped with a metering belt as the feeding port. The feeding port is flush with the floor of the workshop feeding area for easy operation. The project has three sets of raw material batching systems, and all batching and metering are completed in the pit. For easy operation, the pit is designed to be wide enough and fully covered.

Urea Batching And Melting

The first group of raw material batching system is equipped with two metering belt scales, which are mainly used for urea metering. After being measured by the batching metering scale, urea is transported to the melting tank by the urea scraper and the urea high tower bucket elevator, and is heated to 120℃ by steam to melt into liquid, and then transported to the primary mixing tank after melting. Since urea is unstable when exposed to heat, it will deaminate into biuret at 160℃, and its condensation reaction formula is: 2(NH2)2CO=NH2CONHCONH2+NH3. Therefore, the temperature of this process is controlled at 120℃, and the material will not decompose in large quantities. Only a small amount of material will decompose to produce a small amount of NH3. Steam is provided by a natural gas steam boiler, which will produce natural gas combustion exhaust gas.

Potash & Ammonium Treatment

The second group of raw material batching system is equipped with four metering belt scales, which are mainly used for the batching of potash and ammonium fertilizers (potassium sulfate, potassium chloride, ammonium chloride, ammonium sulfate). The agglomerated potash and ammonium fertilizers are first crushed by bulk crushers or chain crushers, and sometimes by cage crushers, and then measured by metering belts, and then transported to the first mixing tank by scraper conveyors and high tower elevators for mixing, and then transported to the second mixing tank.

Monoammonium Phosphate Treatment

The third group of raw material batching system is equipped with two weighing scales, which are mainly used for the batching of phosphate fertilizer (monoammonium phosphate). The agglomerated phosphate fertilizer is first crushed by a cage crusher or a ton bag crusher, weighed by a weighing belt, and then transported to the secondary mixing tank by a scraper conveyor and a high tower elevator.

Emulsification

The mixed raw materials enter the emulsifier for emulsification. During the emulsification process, an appropriate amount of water is added to make the materials melt into liquid faster. No chemical reaction will occur during the emulsification of raw materials. The temperature is controlled at 120℃ when the materials are heated and mixed. According to the physical and chemical properties of the raw and auxiliary materials of the process, urea will deaminate and become biuret at 160℃, and its condensation reaction formula is: 2(NH2)2CO=NH2CONHCONH2+NH3; monoammonium phosphate will decompose at 190℃, lose ammonia and water, and generate a mixture of ammonium metaphosphate and phosphoric acid. The reaction formula is: 2NH4H2PO4=NH4PO3.H3PO4+NH3+H2O. At 100℃, only a very small part will be decomposed by heat (in actual production control, after monoammonium phosphate is added to the second mixing tank, the residence time does not exceed 2 minutes, the purpose is to shorten the contact time with urea and reduce the decomposition to produce NH3). When the temperature of this process is controlled at 120℃, the material will not decompose in large quantities. Only a very small amount of urea and monoammonium phosphate will decompose and produce a small amount of NH3 during the heating, melting and mixing process. The emulsification heat source comes from the natural gas steam boiler, which produces natural gas combustion exhaust.

High Tower Granulation

The working principle of high tower granulation is to liquefy the mixed materials and then enter the high-pressure spray granulator for granulation. The mixed slurry with certain fluidity and viscosity is sprayed into fine liquid particles through the nozzle at the top of the 117-meter-high tower. Due to the effect of surface tension, it becomes spherical small liquid particles after dispersion. During the descent of the liquid particles in the high tower, they are subjected to the resistance of the cold air entering from the bottom of the tower and undergo heat exchange, so that the liquid particles are cooled and solidified to form compound fertilizer particles with a certain strength. The particles collide with each other and fall into the disc collector at the bottom of the tower under the action of gravity. The finished products out of the tower are collected by a belt. The semi-finished compound fertilizer is first sent to the rotary cooler and then lifted to the powder flow cooler. After the particle temperature is cooled, the finished product enters the rotary coating machine for surface coating, and then the packaging process is carried out. High tower granulation is mainly a process of cooling liquid materials into solid granular materials using gravity and cold air. The production process does not involve chemical reactions. The high tower granulator is located inside the granulation tower. The granulation tower is a closed working tower. The exhaust gas is discharged from the exhaust port of the granulation tower equipment to the No. 2 cyclone dust collector, No. 2 bag dust collector, No. 2 washing tower water washing and demister treatment, and then discharged through the tower top exhaust pipe DA003 to meet the standards.

High Tower Screening

After the materials are collected from the disc collector of the high tower compound fertilizer, they are transported to the drum screening machine through a long-distance belt conveyor and a bucket elevator. High tower compound fertilizer usually uses a drum screening machine because the vibrating screen has a large dust emission and is not suitable for high tower compound fertilizer. Two screenings are performed during the screening process: primary screening and fine screening. Unqualified materials will be returned to the chain crusher for re-crushing and then lifted to the top of the tower for re-granulation. Finished products with qualified sizes enter the next cooling process to ensure product quality and uniform particle size. This process optimizes production efficiency, reduces dust emissions, and improves the quality of finished products.

High Tower Cooling

The temperature of the compound fertilizer particles produced by high tower granulation is about 70~80℃. After being screened by the drum screening machine, they enter the drum compound fertilizer cooler. The main function of the cooler is to cool the compound fertilizer particles, because too high a temperature will affect the quality of the particle coating, thereby affecting the appearance and preservation performance of the compound fertilizer. The cooler adopts a convection design, with air supplied by the tail centrifugal fan, and the material contacts the opposite direction of the air supply airflow, which significantly improves the cooling effect. A heavy hammer device is also installed at the tail to reduce the material sticking to the wall.

Coating

Coating is a key process in compound fertilizer production. Its function is to introduce the finished product after being treated by the rotary screening machine and the cooler into the coating machine for surface treatment. The coating process of organic fertilizer is slightly different from that of inorganic fertilizer. The color of inorganic fertilizer can be freely adjusted, usually pure white, and finished products of various colors can be made by coating. However, due to the addition of organic matter (such as cow dung and sheep dung), the color of organic fertilizer is brown, and the color of the finished product can only be brown, not bright colors. This is the main difference between organic fertilizer and inorganic fertilizer in the coating stage.The coating machine system is relatively complex. In addition to the coating machine itself, it also includes a coating oil tank that provides coating oil, and an automatic batching scale that controls the amount of compound fertilizer entering the coating machine. The amount of coating oil needs to match the finished product batching ratio, so a DCS control system is required to adjust the speed of automatic batching and the amount of coating oil. An anti-caking agent screw conveyor is also provided in the coating process to prevent organic compound fertilizer particles from agglomerating or flying. The anti-caking agent is quantitatively supplied to the coating machine through DCS control to ensure that the anti-caking agent and coating oil are evenly distributed in the finished product to prevent particles from agglomerating or flying. The strength of organic compound fertilizer particles after coating can usually reach about 15 Newtons.

Packaging

Regarding the packaging machine for finished compound fertilizers, two solutions are provided: one is a semi-automatic packaging system and the other is a fully automatic packaging system. The traditional double-cylinder packaging scale has been eliminated, and now the main automatic quantitative packaging scale with a servo motor is used. This servo motor packaging scale is faster and more accurate, and the packaging speed can reach 800 to 1000 bags per hour. The packaging scale body is made of S304 stainless steel, with a thickness ranging from four to eight millimeters. The main electronic components are Schneider, and the pneumatic components are imported from Japan. After the material comes out of the fertilizer coating machine, it first enters the buffer silo of the finished product packaging scale, and then passes through the automatic quantitative packaging below. The system is also equipped with automatic folding and automatic sewing systems to achieve semi-automatic packaging. If the automation requirements are high, the fully automatic packaging system can better meet the needs. The difference lies in whether the automatic bagging machine is used in the bagging process. The automatic bagging machine can improve efficiency and save labor, but the investment cost is relatively high.

Automatic Palletizing

After the finished compound fertilizer is weighed and bagged on the packaging scale, it enters the palletizing system. The system is mainly composed of an all-stainless steel SS304 conveying system and support legs. After the fertilizer bags are packaged, they are transported one by one by the conveyor belt to the bottom of the palletizing robot for palletizing. ABB or Fanuc robotic arms are usually used, the steel truss is reliable, and the speed can reach 1000 to 1200 bags/hour. There are three types of palletizers: one machine with one rudder (the most common form); one machine with two rudders (suitable for high-production production lines); and a single-grip palletizer system (although dual grippers are less common). In addition, the system is also equipped with a conveying system and an automatic rewinding system.

VIDEO

WHY CHOOSE US

The cement production line is efficient, reliable, and provides consistent quality. Customer service and support are excellent. We're highly satisfied and would recommend it.

William

CFO

The cement production line is efficient, reliable, and provides consistent quality. Customer service and support are excellent. We're highly satisfied and would recommend it.

Alexander

CEO

The cement production line is efficient, reliable, and provides consistent quality. Customer service and support are excellent. We're highly satisfied and would recommend it.

Ethan

CEO

The cement production line is efficient, reliable, and provides consistent quality. Customer service and support are excellent. We're highly satisfied and would recommend it.

Ethan

CEO

FAQ

1. What are the main advantages of the high tower compound fertilizer production line?

1) The high tower compound fertilizer production line adopts high tower spray granulation technology, which simplifies the process flow and improves production efficiency. Through the gravitational potential energy and spray technology of the high tower, continuous and efficient fertilizer production can be achieved.

2) Because the gravitational potential energy and heat of the material itself are utilized, energy consumption is significantly reduced. Due to the heat and gravity in the production process, energy consumption is greatly reduced and production costs are reduced.

3) The dust and waste gas emissions during the production process are low, and the environmental protection effect is significant. The high tower granulation process enables waste gas and dust to be centrally treated, reducing pollution to the environment.

4) The produced compound fertilizer particles are uniform, high in strength, not easy to pulverize, and suitable for mechanized fertilization. These advantages make the high tower compound fertilizer production line have broad application prospects and market potential in modern agriculture.

2. What are the raw materials of the high tower compound fertilizer production line?

The raw materials commonly used in the high tower compound fertilizer production line include urea, monoammonium phosphate, potassium chloride, potassium sulfate, ammonium chloride, ammonium sulfate and various additives. These raw materials are transported manually to the feeding port in the pit and temporarily stored.

Each raw material is accurately measured and proportioned by a computer automatic batching system to ensure that the composition ratio of each batch of products is accurate. Through different batching systems, compound fertilizers of various proportions can be produced according to demand to meet the nutritional needs of various crops.

Some trace elements and biostimulants can also be added as needed to further improve the nutritional value and efficacy of compound fertilizers. These raw materials are finally produced into high-quality compound fertilizer products through a series of complex process flows to meet the diverse needs of the market.

3. What is the process flow of the high tower compound fertilizer production line?

The process flow of the high tower compound fertilizer production line includes steps such as raw material storage and batching, solution preparation, spraying, granulation, cooling, screening and packaging. After the raw materials are metered and mixed by the automatic batching system, they enter the solution preparation system to prepare nutrient solution.

The nutrient solution is sprayed to the top of the high tower through the spraying system, and the droplets cool and solidify during the falling process in the tower to form granular compound fertilizer. After cooling and screening, the particles enter the packaging system to complete the production.

The entire process is highly automated and can achieve efficient and stable production. In each key process, advanced monitoring and control equipment are used to ensure the precise control of production process parameters. Through a strict quality control system, the quality of each batch of products is ensured to be stable and meet the standards.

4. What are the environmental advantages of the high-tower compound fertilizer production line?

1) The high-tower compound fertilizer production line has significant advantages in environmental protection. First of all, the dust and waste gas emissions during the production process are low, which reduces pollution to the environment. The high-tower granulation process enables waste gas and dust to be centrally treated, and the use of multi-stage dust removal devices and tail gas treatment systems minimizes emissions.

2) The closed production process effectively controls the escape of pollutants, and the entire production process minimizes the impact on the environment.

3) The waste gas is discharged in compliance with the standards through a multi-stage treatment system, such as a cyclone dust collector, bag dust collector and washing tower, which further reduces pollution. In addition, the wastewater generated during the production process can be recycled after scientific treatment, reducing water resource consumption.

5. What are the main equipment of the high tower compound fertilizer production line?

The main equipment of the high tower compound fertilizer production line includes raw material storage and batching system, solution preparation system, spraying system, high tower reactor, cooling and screening system, product packaging system, etc.

The raw material storage and batching system is responsible for storage and precise batching, the solution preparation system dissolves the solid raw materials into nutrient solution, the spraying system sprays the nutrient solution into the top of the high tower, granulation is carried out in the high tower reactor, the cooling and screening system cools and screens the particles, and the product packaging system is responsible for the packaging and storage of the finished product.

The equipment in each process has been carefully designed after years of experience summary to ensure the efficiency and stability of the production process and the excellent product quality. In addition, necessary testing and control equipment should be equipped to ensure real-time monitoring and control of the production process.

6. What are the quality control methods for high-tower compound fertilizer production lines?

The quality control methods for high-tower compound fertilizer production lines mainly include three aspects: raw material testing, process control and finished product testing.

1) Raw material testing includes testing the physical and chemical properties of incoming raw materials to ensure that the quality of raw materials meets the standards.

2) Process control uses online monitoring and control systems to monitor key parameters in the production process in real time, such as temperature, pressure, flow, etc., to ensure the stability and consistency of the production process.

3) Finished product testing is to test the physical and chemical properties of the outgoing products, such as particle size, strength, nutrient content, etc., to ensure that the product quality meets national and industry standards. In addition, a sound quality management system should be established, and regular internal audits and external certifications should be conducted to ensure continuous improvement and enhancement of the production process and product quality.

7. What is the principle of high tower granulation?

The high tower granulation tower is a highly efficient fertilizer granulation equipment, mainly used for granulation of solid fertilizer melt. The main equipment includes three parts:

1) Tower body itself: The granulation tower is the main equipment for high tower granulation to produce granular compound fertilizer. Its main function is to crystallize the compound fertilizer and cool and heat exchange it in the tower. The diameter and height of the granulation tower are the main indicators of the equipment, which are closely related to the production capacity and quality of the product.

2) Granulator equipment: The granulator can meet the requirements of various slurry compound fertilizer granulation as needed, especially in the granulation of medium and low nitrogen compound fertilizers.

3) Mixing tank: The main function of the mixing tank is to fully stir and mix the materials in the equipment to prepare a mixed slurry with good flow properties.
4) The working principle of the high tower granulator is to emulsify the material first, and then spray the mixed slurry with a certain fluidity and viscosity on the top of the 117-meter-high tower through a nozzle. Due to the effect of surface tension, mixed spherical liquid particles are formed during dispersion.

5) As the liquid particles fall in the high tower, they interact with the resistance of the rising cold air entering from the bottom of the tower and exchange heat with it, causing the liquid particles to cool and solidify to form compound fertilizer particles with a certain strength. The particles collide with each other and fall into the disc collector at the bottom of the tower under the action of gravity.

HIGH TOWER FERTILIZER PLANT TECHNICAL PARAMETERS

Equipment NameCapacityDimensionsQuantityPower (kW)
Measuring Belt Scale20 tons/hourB650, Length = 2200 mm81.5 + 1.5
Buffer Bin1.72 cubic meters1200 x 1200 x 1200 mm8Not applicable
Chain Grinder/Bulk Crusher50 tons/hourFS800322 kW
Bucket Elevator50 tons/hourTGD500 × 108 m335 kW
Urea Melting Tank30 tons/hour2200 x 2000 x 2000 mm15 kW
Fluid Mixing Tank50 tons/hour1800 x 2000 mm23 kW
Emulsifier80 tons/hourTL-80023 kW
High Tower Granulator80 tons/hourHeight: 108 m, Depth: 20 m222 kW
High Tower Rotary Cooler150 tons/hour2.0 x 24 m1132 kW
Screening Machine150 tons/hour2.2 x 8 m122 kW
Powder Flow Cooler150 tons/hour2000 x 1500 x 8000 mm115 kW
Coater150 tons/hour2.2 x 8 m145 kW
Automatic Packaging System75 tons/hourLCS-5027.5 kW
Bagging Machine75 tons/hourTL-500210 kW
Stacking Robot75 tons/hourZJ-75222 kW