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Method for producing compound fertilizer by high tower tubular reactor

A technology of tubular reaction and tubular reactor, applied in application, fertilization equipment, fertilizer mixture, etc., can solve the problems of inability to produce low-nitrogen and high-phosphorus compound fertilizers, product specification restrictions, high energy consumption, etc., and achieve small fluctuations in product nutrients , granulation fluctuation is small, and the effect of optimizing the environment

Active Publication Date: 2012-07-25
SHENZHEN BATIAN ECOTYPIC ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for producing compound fertilizer by high-tower tubular reaction, which overcomes the shortcomings of the current high-tower granulation technology that cannot produce low-nitrogen and high-phosphorus compound fertilizer, high energy consumption, and limited product specifications.

Method used

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  • Method for producing compound fertilizer by high tower tubular reactor
  • Method for producing compound fertilizer by high tower tubular reactor
  • Method for producing compound fertilizer by high tower tubular reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: 15-15-15 compound fertilizer

[0037] Step (1): Set the mass concentration to 52% (in P 2 o 5 Wet-process phosphoric acid and ammonia gas are fed into the tubular reactor at the same time, and phosphoric acid reacts with ammonia rapidly in the tubular reactor to obtain ammonium phosphate slurry, and the heat released by the reaction turns water into steam.

[0038] Step (2): Pass the slurry and steam obtained in step (1) into a steam separator to separate the slurry and steam.

[0039] Step (3): Pass the separated slurry into the melt mixer, and add solid raw materials into the melt mixer: urea, potassium chloride, filler, part of the solid raw materials are melted by the heat of the ammonium phosphate slurry itself, and the other A part is melted by the heat of steam to obtain a eutectic slurry.

[0040] Step (4): The eutectic slurry obtained in step (3) is sprayed into the granulation tower through the rotary granulation nozzle on the top of the tower...

Embodiment 2

[0042] Embodiment two: 15-15-15 compound fertilizer

[0043] Identical with embodiment one step, wherein, the mass concentration of phosphoric acid is 52% (in P 2 o 5 Wet-process phosphoric acid in total), and the solid raw materials in step (4) are ammonium nitrate, potassium sulfate and filler.

[0044] The ratio (mass ratio) of phosphoric acid, ammonia gas, ammonium nitrate, potassium sulfate and filler is 0.700:0.087:1.000:0.784:0.194.

Embodiment 3

[0045]Example three: 10-20-20 compound fertilizer

[0046] Identical with embodiment one step, wherein, the mass concentration of phosphoric acid is 47%-54% (in P 2 o 5 In terms of wet-process phosphoric acid), the solid raw materials in step (4) are urea, potassium chloride and filler.

[0047] The ratio (mass ratio) of phosphoric acid, ammonia, urea, potassium chloride and filler is 1.000:0.151:0.290:0.867:0.589.

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Abstract

The invention relates to a method for producing a compound fertilizer by a high tower tubular reactor, which comprise the following steps of: adding acid and ammonia which are used as raw materials into the tubular reactor to perform the mixing reaction to prepare mixed slurry; separating the mixed slurry from steam by a steam separator; and filling the slurry obtained by separating into a slurry tank, spraying the slurry into a granulation tower by a granulation spray nozzle at the top of a tower, cooling granulation materials by the cold air in the tower to ensure that the granulation materials fall onto the bottom of the tower and sieving to obtain the compound fertilizer. The molten slurry is obtained by utilizing the reaction heat of the acid and the ammonia and a part of solid raw materials can also be molten down, so that energy is saved and the consumption is reduced; the acid and the ammonia which are used as the raw materials are fluid and are more beneficial to mechanical operation, labor is saved, the dust quantity is reduced and the environment is optimized; and the slurry is in a molten state, so that a low-nitrogen high-phosphorus compound fertilizer can be produced by the high-tower granulation.

Description

technical field [0001] The invention relates to a method for producing compound fertilizer by high-tower granulation, in particular to a method for producing compound fertilizer by high-tower tubular reaction. [0002] Background technique [0003] The method of high-tower granulation to produce compound fertilizer has become a relatively mature process. The process principle is that solid urea or ammonium nitrate (ammonium phosphorus nitrate, etc.) is heated and melted to become a molten liquid, and the evaporated and concentrated molten liquid can also be used directly. Add corresponding phosphate fertilizer, potash fertilizer, filler and additives to the molten liquid to make mixed slurry. The mixed slurry is sent to the high-tower granulator for spraying and granulation. The granulated material sprayed into the granulation tower through the granulator interacts with the gas resistance rising from the bottom of the tower during the process of descending from the high-to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00
Inventor 黄培钊张运森褚红艳
Owner SHENZHEN BATIAN ECOTYPIC ENG
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