Method for lowering biuret content in high-tower granulated compound fertilizer and production facility thereof

A high-tower granulation and compound fertilizer technology, which is applied in the direction of fertilization equipment, fertilizer mixture, application, etc., to achieve the effects of reducing evaporated water, saving energy consumption, and reducing production

Active Publication Date: 2014-12-10
SHENZHEN BATIAN ECOTYPIC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the urea plant produces urea and directly inputs the urine into the granulator for granulation, there is also the problem of biuret due to long pipelines and high temperature

Method used

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  • Method for lowering biuret content in high-tower granulated compound fertilizer and production facility thereof
  • Method for lowering biuret content in high-tower granulated compound fertilizer and production facility thereof
  • Method for lowering biuret content in high-tower granulated compound fertilizer and production facility thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] see image 3 , a method for reducing the content of biuret in high-tower granulated compound fertilizers. The dilute urine with a temperature of 80-90°C and a concentration of 70-80wt% from the urea workshop is pumped to the urea on the granulation tower with the pump body 8 Evaporation device, through evaporation and concentration, reaches the concentration of urine moisture required (95-99.75wt%) for urine-based compound fertilizer; the concentrated urine that reaches the standard enters the first-level mixing tank and the second-level mixing tank of the pulping device on the tower, Pre-mix with potassium fertilizer, phosphate fertilizer and auxiliary materials; after mixing, flow into the emulsifier of the pulping device on the tower to emulsify to obtain slurry; pass the slurry to the granulator on the tower for granulation to obtain urea-based compound fertilizer granules.

[0031] Firstly, use dilute urine with a temperature of 80-90°C and a concentration of 70-80...

Embodiment 2

[0034] see Figure 4 , a production equipment for reducing the biuret content of high-tower granulation compound fertilizer, including the tower body of the granulation tower, and the delivery device for conveying urine. In this example, the pump body 9 is used. Evaporation unit 1, pulping unit and granulator 5 for evaporative concentration. The pulping device includes a primary mixing tank 2 , a secondary mixing tank 3 and an emulsifier 4 . The evaporating device 1, the pulping device and the granulator 5 are all arranged on the tower, and are sequentially connected through conduits. The pump body 8 is connected with the pipeline of the tower to provide power to transport the urine to the evaporation device 1 on the tower through the pipeline.

Embodiment 3

[0036] The difference between this embodiment and Embodiment 2 is that the evaporation device 1 is arranged above the pulping device on the tower.

[0037] In addition, after the granulator 5, a screening device 6, a cooling device 7 and a packaging device 8 are sequentially connected, which are respectively used for subsequent screening, cooling and packaging processes.

[0038]In this way, the pump body 9 directly pumps the dilute urine from the urea plant to the evaporation device 1 on the tower for evaporation and concentration, and then transports it to the primary mixing tank 2 and the secondary mixing tank 3 for mixing, and then enters the emulsifier 4 and the production process. The granulator 5 performs emulsification and granulation. This process eliminates the severe condensation reaction due to the long residence time and high temperature during the transportation process when the concentrated urine is directly used, thereby reducing the generation of biuret during...

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Abstract

The invention relates to a method for lowering biuret content in a high-tower granulated compound fertilizer, which comprises the following steps: controlling dilute urine in an upper tower pipeline at the 80-90 of DEG C and the concentration of 70-80 wt%, sending the dilute urine to an urea evaporator on a granulation tower by a pump body, and concentrating by evaporation to reduce the excessive biuret content due to overhigh concentration and temperature when the evaporation urine is in the upper tower pipeline; and sending into a pulping device on the tower, mixing and pulping with a potassium fertilizer, a phosphate fertilizer and adjuvants, and granulating by a granulator on the tower to obtain urea-based compound fertilizer granules. The mass percent of the biuret is lower than 0.5%, and is much lower than the content of biuret generated by the existing method. The invention also discloses a production facility of the method. According to the production facility, the urine evaporator, which is installed under the tower in the existing production facility, is installed on the tower, thereby reducing the melting link and controlling the generation of the biuret in the tower urine pipeline transmission link.

Description

technical field [0001] The invention relates to a method for reducing the content of biuret in high-tower granulated compound fertilizer and its production equipment. Background technique [0002] Generally, the melting temperature of agricultural urea is 130°C. During the melting and mixing process of urea, urea itself will undergo a condensation reaction, and two urea molecules will condense into one molecule of harmful substance biuret, which is toxic to crops. , There are often reports of damage to crops due to excessive biuret. The law of biuret formation: it is related to the temperature of urea. The higher the temperature of urea, the more intense the condensation reaction will be, and the reaction will be slower below 100°C; it is related to the reaction time, and the biuret formed with the extension of the residence time content increased. Currently, urea-based compound fertilizers are produced through high-tower technology. Generally, solid urea is melted in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00
Inventor 范素民陆彥平
Owner SHENZHEN BATIAN ECOTYPIC ENG
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