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Improved method of purifying gas containing urea dust

A urea and dust technology is applied in the field of improved purification of urea-containing dust gas to achieve the effect of reducing ammonia emissions, low energy consumption and small emissions

Inactive Publication Date: 2005-04-27
顾大地
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of washing method is effective under the condition that the prilling tower has excess capacity and the environment can accept the discharge of conventional prilling towers (about 100 mg of urea dust per cubic meter of gas). However, with the increasing social requirements for environmental quality, Many areas can no longer accept the impact of prilling tower discharge on the environment, and the above schemes need to be improved

Method used

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  • Improved method of purifying gas containing urea dust
  • Improved method of purifying gas containing urea dust
  • Improved method of purifying gas containing urea dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] figure 1 The middle is the flow chart of the principle of using the scrubber to purify all the tail gas. 97-85% of the raw material urea melt is sent to the large-grain urea unit 1 through the urea melt pump 4 at a temperature of about 134-138°C, and 3-15% is sent to the urea prilling tower 3 . The small granular urea with a temperature of about 45-60°C at the bottom of the prilling tower 3 is sent to the large granular urea plant 1 as a crystal seed, and after contacting with the urea melt sent by the urea melting pump 4, the large granular urea product is produced. The washing tower 2 receives the tail gas containing urea dust from the prilling tower 3 and the large-grain urea plant 1, and discharges it to the atmosphere after being washed. The tail gas 6 containing hydrogen and ammonia from the urea plant can also be sent to the washing tower for washing and then discharged. Since the large-grain urea plant adopted in the present invention is a double-drum fluidiz...

Embodiment 2

[0033] figure 2 It adopts scrubber to purify all the tail gas, and the product contains both large and small particle urea. The difference from Example 1 is that the quantity of urea melt that enters the prilling tower from the raw material urea melt pump 4 is relatively large, and the quantity of small granular urea produced is greater than the number of seed crystals required by the large granular urea plant. Small granular urea leaves the factory as a product.

Embodiment 3

[0035] image 3 It is a process in which a scrubber is used to purify part of the tail gas, and all products are large-grained urea. The difference from Example 1 is that the gas in the prilling tower 3 is directly emptied and no longer enters the washing tower 2.

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Abstract

The present invention provides one improved method of purifying air containing urea dust through reducing total tail gas exhaust greatly to raise the environment quality around urea plant. The present invention includes the following steps: pelletizing urea of molten urea in double-cylinder fluidized bed large grain urea apparatus; and washing air connecting urea dust in tail gas washing tower or absorbing with molten urea drops moving inversely in the pelletizing tower before exhausting.

Description

technical field [0001] The invention relates to a production method of urea or urea compound fertilizer, in particular to a method for purifying urea-containing dust gas in the production process. The method can help improve the environmental quality around urea factories. Background technique [0002] The present invention is an improvement application for the application number 99121906.6 titled "a method of purifying urea dust-containing gas". In the content of the invention of the 99121906.6 patent application, the gas containing urea dust is directly sent into the prilling tower, The nozzle at the top of the original prilling tower sprays the urea melt into droplets, which move from top to bottom in the prilling tower. The urea-containing dust and urea melt droplets move in reverse, contact with the melt droplets and be absorbed, and the purification of urea dust gas is achieved through absorption. This washing method has excess capacity in the prilling tower, and the e...

Claims

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Application Information

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IPC IPC(8): B01J2/04C05C9/00C07C273/00
Inventor 顾大地
Owner 顾大地
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