Granulation method of large particle urea

A large-granule urea and granulation technology, which is applied in the direction of urea compound fertilizer, nitrogen fertilizer, fertilizer mixture, etc., can solve the problems of poor product color, complex process flow and high operating cost, and achieve good color and luster, good cooling effect and operating cost. low effect

Inactive Publication Date: 2005-11-23
SICHUAN MEIFENG CHEM IND
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Problems solved by technology

However, this technology also has the following problems: first, the process is complex, using more than 50 sets of equipment, and the operation is cumbersome; second, the investment is large, and the device with a production capacity of 500t / d needs more than 20 million yuan; third, the operating cost is high. Increased power consumption by 50Kw.h / T.ur, and formaldehyde by 12kg / T.ur; Fourth, in order to improve the strength of urea granules, formaldehyde was added to the finished urea, and the color of the product was not good

Method used

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  • Granulation method of large particle urea
  • Granulation method of large particle urea
  • Granulation method of large particle urea

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Embodiment Construction

[0023] see Figure 2 to Figure 5 .

[0024] The invention includes three parts, namely granulation, urea granule cooling and dust removal, and recovery of urea dust. Wherein, granulation and urea particle cooling and dedusting are the core content of the present invention, and the recovery of urea dust is only a supporting technical measure.

[0025] The large particle urea granulation method comprises the following steps

[0026] (1) Use the improved granulation nozzle to spray and granulate molten urea with a temperature of 138-142°C. The particles are cooled and solidified by the prilling tower, and the temperature drops to 70-85°C to form solid urea with a particle size of 1.6-2.8mm. particles;

[0027] (2) The solid urea particles are sent to the gas-solid heat transfer and dust removal device, and the cold air is fluidized and dedusted and cooled to remove small particle size dust. The temperature of the solid urea particles is reduced to 40-50°C, and it becomes a dus...

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Abstract

A granulating process for preparing big urea particles includes such steps as using improved sprayer to spray uniform and big urea particles, cooling and solidifying in cooling tower, and fluidized cooling and dusting.

Description

technical field [0001] The present invention relates to a process for the production of urea, especially a process for granulation of urea. It is suitable for the granulation process of the granulation system of various urea production process devices that adopt tower granulation to produce large granule urea with uniform particle size and improve the external quality of the product. Background technique [0002] At present, there are more than one hundred enterprises using various urea production process devices for tower granulation. The design of the granulation section is relatively simple (the process flow is shown in Figure 1), and there are three problems. One is that the structure of the granulation nozzle of the granulator is unreasonable, the sprayed urea particles have different particle sizes, and the cooling rate is different in the subsequent cooling treatment. The cooling rate of the large particle size is low. Low, easy to pulverize; the average particle siz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05C9/00C05G5/00
Inventor 陈平黄瑞阳勾永梁杨久宜童刚
Owner SICHUAN MEIFENG CHEM IND
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