Method and device for recovering dust of urea granulation

A technology of dust recovery and urea granulation, which is applied in the chemical industry to achieve the effects of small impact, low resistance and obvious recovery benefits

Inactive Publication Date: 2011-05-18
HARBIN HUIZHONG ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing recovery methods are single-item, that is, they are recovered separately in the prilling tower or fluidized bed.

Method used

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  • Method and device for recovering dust of urea granulation
  • Method and device for recovering dust of urea granulation
  • Method and device for recovering dust of urea granulation

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Embodiment Construction

[0028] Taking the hydrolysis wastewater as the absorption liquid in parallel closed-circuit circulation in the devices (I) and (II) as an example, in conjunction with the drawings, non-limiting embodiments are described as follows:

[0029] 1. Device (I): As shown in Figure 1, figure 2 As shown, the absorption cylinder 2 is fixed at the top of the prilling tower 1, and the gas distribution device 3 and the sump 4 are fixedly connected below it. The sump 4 is connected to the liquid storage tank 5 through a pipe, and the liquid storage tank 5 is fixed at On the urea granulation rack 17.

[0030] In the absorption cylinder 2, there are three-stage atomization and dust absorption spiral type non-blocking atomization nozzles 6a, 6b and 6c, of which 6b and 6c spray up and down; below the nozzle 6a is set a blade type defogging nozzle as shown in Figure 5 The plate 7 is provided with a vertical honeycomb grid filler 8 as shown in FIG. 6 between the nozzles 6b and 6c.

[0031] The outlet o...

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Abstract

The present invention provides a dust recycling method and apparatus of urea prilling, the recovery method is synchronous recycling prilling dust and cooling dust when a water absorption liquid processes closed-circuit in multiple system or series connected system set in the prilling tower top device (I) and the flooring device (II). A multilevel nozzle is set in the device I and the device II, dust is absorbed respectively by atomizing water, the absorption liquid absorbs prilling dust and then returns to the fluid storage tank (5) in the device I, and cycled to the device I after absorbing cooling dust by potential difference in the device II. A gas distributed device and a gas-liquid separating device, pumps (15, 11) are respectively set in the device I and the device II to cycle, whenthe concentration of urea in absorption fluid is > / = 25%, the absorption fluid is transferred to the steam evaporating system to recycling urea. The method and device recycle the prilling dust and the cooling dust at the same time, not only improve the super quality efficiency of the product, but also the discharging tail gas keep with the national environmental protection standards.

Description

1. Technical Field [0001] The invention relates to a dust recovery method and device in the chemical industry, in particular to a urea granulation dust recovery method and device. 2. Background technology [0002] Urea granulation means that molten urea is cooled and granulated in a prilling tower, that is, it is heat exchanged with cold air sent from the bottom of the tower to solidify into granules. The so-called cold air is relative to the molten urea. The airflow gradually heats up during the ascent process and entrains the dust to be discharged from the top of the tower. The temperature gradient between the bottom and the top of the tower forms a thermal head which has a natural ventilation effect and promotes the rise of the airflow. The formed particles are sent to a fluidized bed to cool down and then are classified and packaged by a vibrating screen. The so-called urea granulation dust refers to the dust formed during the granulation of the prilling tower and the dust f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14B01D53/18
Inventor 李洪林
Owner HARBIN HUIZHONG ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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