I. Overview
Most enterprises in China use the spray tower granulation technology to produce urea granules. The urea droplets that are discharged through the nozzles are cooled and solidified during the falling process. The shell is cooled after the shell is formed. The internal stress of the particles is caused by the density change before and after the urea cooling. In the process of falling and storage, loading, transportation, application, etc., it is easy to be broken; the fertilizer efficiency utilization rate is less than 35%; in the process of fertilization, the fine powder adheres to the leaves, which is easy to cause burning, lacks market competitiveness, and is produced by mechanical granulation technology. Large granular urea, 10% higher than ordinary granular urea, good quality, high strength, has a significant market competitive advantage.
Tsinghua University's large-particle urea preparation technology has been successfully industrialized. The product is round and white, beautiful in appearance, high in strength, and does not produce biuret in the granulation process. The products and technical indicators have reached and exceeded the foreign introduction technology. The mechanical granulation The technology not only produces large-grain urea with a particle size of 3~5mm which is currently sold in the market, but also produces high-quality slow-release large-grain urea with a uniform particle size of 6~8mm, and can also produce urea for super-large grain forest farm with a diameter of 10~15mm. The shape of large granular urea is spherical, and its sphericity is higher than that of foreign imported technology. For the same production capacity, the construction cost of the granulation technology is much lower than that of foreign imported technology, and the operation process is easy.
Second, the characteristics
The low-pressure fan is used to provide fluidized air, and the fluidized bed has high heat transfer efficiency, low equipment cost and low energy consumption.
The unique exhaust gas treatment method eliminates the huge and complicated exhaust gas washing system.
The product has a uniform particle size and eliminates the oversized particle crushing system.
The particle size of the product can be adjusted arbitrarily according to market demand. It can produce spherical particles larger than 10mm. It can be used for multi-layer and multi-component coating to produce slow release and controlled release of large granular urea or compound fertilizer.
The fine urea droplets are continuously coated and grown on the surface of the dynamic particles, and are cooled layer by layer from the inside to the outside. The particle strength is high and the sphericity is high.
(6) It can be used together with the granulation tower. It can also be used in new systems. The process is simple, the operation flexibility is large, and all equipment is localized.
Tsinghua University is researching and developing technology upgrade technology, long-acting slow release and high-efficiency control of large-particle urea and compound fertilizer production technology. For enterprises that have used this technology to produce large-grain urea, they will be upgraded on the basis of the original technology.
Third, technical indicators
According to the requirements of the enterprise, determine the particle size of large granular urea products (3~5mm; 6~8mm or other), 3~5mm, strength>30N, 6~8mm, strength>80N.
Exhaust emissions meet environmental indicators.
The granulation process does not produce biuret.
Fourth, application notes and market prospects
The raw material is made of urea or 96% urea solution; it needs to be equipped with power, steam and cooling water. The main equipment of the large particle urea production system is granulator, cooler, sieve, blower, induced draft fan, heat exchanger, belt. Conveyor, packaging machine.
The large granular urea produced by this technology has good quality, high fertilizer efficiency and strong market competitiveness.
V. Analysis of economic benefits
The design capacity is 50,000-200,000 tons/year. The greater capacity can be developed and scaled up through negotiation between the two parties. The cost of the granulation process is about 20 yuan/ton of large-grain urea. The initial estimate is that the profit increases by about 80-180 yuan/ton.
The large granular urea produced by this technology has good quality, high fertilizer efficiency and strong market competitiveness.
Six, the way of cooperation
Tsinghua University provides basic design, non-standard equipment design or equipment, guides commissioning, personnel training, or other means of consensus. For materials with similar characteristics, the granulation technology design for the material can be undertaken according to the negotiation between the two parties. Or joint development. Funds are determined by both parties based on specific scale, basic conditions, tasks, etc.
Most enterprises in China use the spray tower granulation technology to produce urea granules. The urea droplets that are discharged through the nozzles are cooled and solidified during the falling process. The shell is cooled after the shell is formed. The internal stress of the particles is caused by the density change before and after the urea cooling. In the process of falling and storage, loading, transportation, application, etc., it is easy to be broken; the fertilizer efficiency utilization rate is less than 35%; in the process of fertilization, the fine powder adheres to the leaves, which is easy to cause burning, lacks market competitiveness, and is produced by mechanical granulation technology. Large granular urea, 10% higher than ordinary granular urea, good quality, high strength, has a significant market competitive advantage.
Tsinghua University's large-particle urea preparation technology has been successfully industrialized. The product is round and white, beautiful in appearance, high in strength, and does not produce biuret in the granulation process. The products and technical indicators have reached and exceeded the foreign introduction technology. The mechanical granulation The technology not only produces large-grain urea with a particle size of 3~5mm which is currently sold in the market, but also produces high-quality slow-release large-grain urea with a uniform particle size of 6~8mm, and can also produce urea for super-large grain forest farm with a diameter of 10~15mm. The shape of large granular urea is spherical, and its sphericity is higher than that of foreign imported technology. For the same production capacity, the construction cost of the granulation technology is much lower than that of foreign imported technology, and the operation process is easy.
Second, the characteristics
The low-pressure fan is used to provide fluidized air, and the fluidized bed has high heat transfer efficiency, low equipment cost and low energy consumption.
The unique exhaust gas treatment method eliminates the huge and complicated exhaust gas washing system.
The product has a uniform particle size and eliminates the oversized particle crushing system.
The particle size of the product can be adjusted arbitrarily according to market demand. It can produce spherical particles larger than 10mm. It can be used for multi-layer and multi-component coating to produce slow release and controlled release of large granular urea or compound fertilizer.
The fine urea droplets are continuously coated and grown on the surface of the dynamic particles, and are cooled layer by layer from the inside to the outside. The particle strength is high and the sphericity is high.
(6) It can be used together with the granulation tower. It can also be used in new systems. The process is simple, the operation flexibility is large, and all equipment is localized.
Tsinghua University is researching and developing technology upgrade technology, long-acting slow release and high-efficiency control of large-particle urea and compound fertilizer production technology. For enterprises that have used this technology to produce large-grain urea, they will be upgraded on the basis of the original technology.
Third, technical indicators
According to the requirements of the enterprise, determine the particle size of large granular urea products (3~5mm; 6~8mm or other), 3~5mm, strength>30N, 6~8mm, strength>80N.
Exhaust emissions meet environmental indicators.
The granulation process does not produce biuret.
Fourth, application notes and market prospects
The raw material is made of urea or 96% urea solution; it needs to be equipped with power, steam and cooling water. The main equipment of the large particle urea production system is granulator, cooler, sieve, blower, induced draft fan, heat exchanger, belt. Conveyor, packaging machine.
The large granular urea produced by this technology has good quality, high fertilizer efficiency and strong market competitiveness.
V. Analysis of economic benefits
The design capacity is 50,000-200,000 tons/year. The greater capacity can be developed and scaled up through negotiation between the two parties. The cost of the granulation process is about 20 yuan/ton of large-grain urea. The initial estimate is that the profit increases by about 80-180 yuan/ton.
The large granular urea produced by this technology has good quality, high fertilizer efficiency and strong market competitiveness.
Six, the way of cooperation
Tsinghua University provides basic design, non-standard equipment design or equipment, guides commissioning, personnel training, or other means of consensus. For materials with similar characteristics, the granulation technology design for the material can be undertaken according to the negotiation between the two parties. Or joint development. Funds are determined by both parties based on specific scale, basic conditions, tasks, etc.
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