Improved large granule urea combined drum granulating method and equipment

A large-grain urea and drum granulation technology, which is applied to urea compound fertilizers, fertilizer mixtures, nitrogen fertilizers, etc., can solve the problems of high cost, energy consumption, and low efficiency, and achieve the goals of reducing energy consumption, reducing costs, and simplifying the process. Effect

Active Publication Date: 2013-03-13
北京达立科科技有限公司
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Problems solved by technology

[0003] The present invention aims at the problems of low efficiency, high cost and high energy consumption caused by the use of a combined cooling drum in the existing large-grain urea combined drum granulation process, and provides an improved large-grain urea combined drum granulation method. The method adopts the moving bed cooler, saves the combined cooling drum parts, simplifies the combined drum granulation process of large particle urea, improves the production efficiency and reduces the cost

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  • Improved large granule urea combined drum granulating method and equipment
  • Improved large granule urea combined drum granulating method and equipment
  • Improved large granule urea combined drum granulating method and equipment

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Embodiment Construction

[0030] The present invention will be described below in conjunction with the accompanying drawings.

[0031] The present invention relates to an improved method for granulating large-grained urea in a combined drum. In the method, urea granules are generated and discharged in the fluidized bed of the combined granulation drum, and the discharged urea granules enter a moving bed cooler for cooling. After sifting through a sieving machine, the finished product is obtained, such as figure 1The flowchart shown. Both molten urea 1 and fluidizing air 2 are introduced into the combined granulation drum through pipelines, and in the fluidized bed of the combined granulation drum, the droplets of molten urea 1 are evenly sprayed on the surface of the urea crystal nucleus particles in the fluidized bed, Under the action of the fluidizing air 2 from bottom to top, the urea crystal nuclei particles are continuously increasing in the boiling state, and urea particles of different sizes ar...

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Abstract

The invention relates to improved large granule urea combined drum granulating method and equipment. The method comprises the steps of: generating urea granules in a fluidized bed of a combined granulating drum, then discharging the urea granules from the combined granulating drum, enabling the urea granules discharged from the combined granulating drum to enter a moving bed cooler from an inlet at the upper part of the moving bed cooler, forming a dynamic bed layer in the moving bed cooler, enabling cooling air to enter the moving bed cooler via a variable-passage area baseplate arranged on the moving bed cooler, taking away heat of the urea granules through the inverse motion of the dynamic bed layer composed by the urea granules, and discharging and screening the cooled urea granules from the variable-passage area baseplate so as to obtain finished products. According to the method, a combined cooling drum part is saved by adopting the moving bed cooler, so that the large granule urea combined drum granulating process is simplified, energy sources are saved and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of urea production, in particular to an improved large-grain urea combined drum granulation method and equipment. Background technique [0002] The present invention is an improvement application for the invention patent No. ZL 99122286.5, titled "Large-grain urea combined drum granulation process and equipment". The urea should be cooled in the combined cooling drum. The combined cooling drum is composed of a drum and a built-in wave plate cooler. The wave plate cooler needs to be made by pressing the thin steel plate into waves, and spot welding is required between the waves. The process is complex, so the cost and energy consumption of the combined cooling drum are relatively high, and the cooling efficiency of the wave plate and drum technology needs to be improved, so a more advanced and simple method is needed to improve it. Contents of the invention [0003] The present invention aims at the proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C9/00C05G5/00
Inventor 李思斌顾大地
Owner 北京达立科科技有限公司
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