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Prilling tower and process, in particular for producing urea

A granulation tower, urea technology, applied in the direction of urea compound fertilizer, liquid separation into beads and granulation, application, etc., to achieve the effect of improving final quality and production efficiency, eliminating energy consumption, and reducing total cost

Active Publication Date: 2015-08-05
SAIPEM SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Although the prior art systems are generally satisfactory, there appears to be room for improvement, especially with regard to the quality of urea produced, energy consumption and overall efficiency

Method used

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  • Prilling tower and process, in particular for producing urea
  • Prilling tower and process, in particular for producing urea
  • Prilling tower and process, in particular for producing urea

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0027] has been briefly described above figure 1 A prilling tower of the prior art shown in .

[0028] figure 2 and image 3 A prilling tower 1 according to the invention is shown in .

[0029] The prilling tower 1 of the invention comprises a housing 2 extending along and around a longitudinal vertical axis A;

[0030] The housing 2 extends between an axial top end 5 and an axial bottom end 8 provided with a cover structure 6 connected to the side wall 3 and injectors for supplying the liquid phase (molten urea) in the treatment chamber 4 The bottom end of the device 7 is provided with a transmission structure 9 .

[0031] The side wall 3 is provided with a plurality of adjustable windows 11 , for example provided with adjustable slats of the shutter type, angularly spaced from each other and arranged at the axial bottom end 8 of the housing 2 .

[0032] The conveying structure 9 is arranged below the window 11 and is configured so as to collect the solid material in gr...

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Abstract

A prilling tower (1), in particular for producing ·urea, comprises: a casing (2) extending along and about an axis (A) and provided with an inner treatment chamber (4); a sprayer device (7) arranged at a top axial end (5) of the casing (2) for supplying a liquid phase in the chamber (4); windows (11) set at a bottom axial end (8) of the casing (2) for supplying air inside the chamber (4); and a conveying structure (9) arranged at the bottom axial end (8) of the casing. (2) for collecting prills formed in the chamber (4); the conveying structure (9) is formed by a plurality of flared sectors (20), arranged in series along the axis (A) and converging downwards and towards the axis (A); the sectors (20) are partially inserted inside one another both axially and radially and have respective inner lateral surfaces. (29) slanted so as to cause the prills, deposited on the inner lateral surfaces (29), to slide for the sole effect of gravity towards the bottom outlet (12).

Description

technical field [0001] The present invention relates to a prilling tower and a prilling process especially for the production of urea. The term granulation (or pelletization) refers to a method for solidifying a substance starting from its liquid phase. The operation is usually carried out in a prilling tower: a liquid phase (usually concentrated and hot) is usually sprayed at the top of the tower, while air (usually at ambient temperature) is supplied into the bottom of the tower and countercurrent flow, countercurrent) to the liquid phase, resulting in the formation of generally spherical agglomerated particles ("prills"), usually a few millimeters in diameter. [0002] A typical prilling application is that used in urea production. Background technique [0003] It is well known that urea is produced on an industrial scale by a process based on the reaction between carbon dioxide and ammonia in the form of ammonium carbamate and the subsequent decomposition of the ammoni...

Claims

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Application Information

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IPC IPC(8): B01J2/04C05C9/00
CPCC05C9/005B01J2/04
Inventor 罗斌谢中平凌辉勋利诺·卡莱西
Owner SAIPEM SPA
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