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 saving investment, improving the rate of high-quality finished products, and achieving obvious recycling benefits

Inactive Publication Date: 2008-08-13
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

Examples

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Embodiment Construction

[0028] Now take the hydrolyzed wastewater as an example of the parallel closed-circuit circulation in the devices (I) and (II) as the absorption liquid, in conjunction with the accompanying drawings, the non-limiting examples are described as follows:

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

[0030] The spiral non-blocking atomizing nozzles 6a, 6b and 6c for three-stage atomization and dust absorption are arranged in the absorption cylinder 2, wherein 6b and 6c are sprayed up and down; below the nozzle 6a, a blade type defogging as shown in Figure 5 is arranged Plate 7, between nozzles 6b and 6c, a ve...

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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, when the 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 is the cooling and granulation of molten urea in the prilling tower, that is, heat exchange with the 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 rising process and discharges from the top of the tower with the dust entrained. The temperature gradient between the bottom of the tower and the top of the tower forms a hot pressure head, which has a natural draft effect and promotes the rising of the airflow. The formed granules are sent to the fluidized bed for cooling and then classified and packaged by vibrating sieves. The so-called urea granulation dust refers to the dust formed during granulation in the prilling tower and the...

Claims

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Application Information

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