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Method for belt pre-conditioning, method for pelletizing urea and pelletizing plant

A technology of granulation and pretreatment, which is applied to urea compound fertilizer, granulation on endless conveyor belts, nitrogen fertilizer, etc. It can solve the problems of high equipment and energy costs, and achieve the effect of good washing effect.

Inactive Publication Date: 2007-05-16
SANTRADE LTD
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Problems solved by technology

It is obvious that such measures require high equipment and energy costs

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  • Method for belt pre-conditioning, method for pelletizing urea and pelletizing plant
  • Method for belt pre-conditioning, method for pelletizing urea and pelletizing plant

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Embodiment Construction

[0040] In the schematic diagram of FIG. 1 a pelletizing plant 10 for pelletizing urea is shown. Urea is a meltable product, but has hygroscopic properties not only in the solidified state but also in the molten form. Urea pellets are used, for example, in the manufacture of fertilizers.

[0041] On conventional granulation plants with a surrounding steel belt, due to the hygroscopic properties of urea there is the danger that the molten urea dripping on the steel belt in the form of droplets absorbs moisture and the droplets will become flat. As a result, large cake-shaped granules are formed after solidification, which in extreme cases can even be displaced with adjacent droplets. Large cake-shaped droplets are very unfavorable for storage and reprocessing of urea.

[0042] A urea melt is fed to a granulation plant 10 in a known manner via a supply line 12 to a so-called rotary shaper 14 . The rotary shaper 14 consists of a fixed heated inner shell and an outer tube equip...

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Abstract

Method for belt conditioning in pelletizing plants, method for pelletizing urea and pelletizing plant. The invention relates to a method for belt conditioning in pelletizing plants with a rotating steel belt to which is applied in drop-like manner a melt of a product to be pelletized which is then solidified on the steel belt. According to the invention there are steps of washing off product residues left on the steel belt after removing the solidified pellets using a washing liquid containing at least the dissolved product and drying the washing liquid adhering to the steel belt for forming a dry product film thereon prior to the renewed application of a melt of a product to be pelletized. Use e.g. for pelletizing urea.

Description

technical field [0001] The invention relates to a method for the pretreatment of steel strips in a pelletizing plant with a circulating steel belt, in which a melt of a product to be pelletized is applied in the form of droplets to the on the steel belt and then solidified on the steel belt. The invention also relates to a method for pelletizing urea and a pelletizing plant for carrying out the method according to the invention. Background technique [0002] In the disclosed pelletizing process, a melt of a product to be pelletized is injected into a heated inner shell and an outer tube equipped with a large number of perforations, which surrounds the fixed inner shell concentrically. Rotates and in the process deposits product droplets over the entire width of a circulating steel belt. Here, water is sprayed on the lower side of the steel strip in order to dissipate the heat released during the solidification of the melt and the subsequent cooling of the pellets formed. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J2/26
CPCB01J2/26C05C9/005B29B9/10
Inventor K·舍穆特兹基H·-K·施罗姆
Owner SANTRADE LTD
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