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Tail gas absorption process and device in melamine production process

A melamine and production process technology, applied in the field of tail gas absorption technology and devices, can solve the problems of low absorption efficiency, low ammonia concentration, waste and the like, and achieve the effects of convenient operation, high economic benefit and simple structure

Pending Publication Date: 2021-02-12
HOLITECH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional tail gas treatment process absorbs the ammonia gas with water. Because the partial pressure of the ammonia gas is too low, the absorption efficiency is very low. There will be ammonium bicarbonate crystallization, and the absorption of ammonia gas is not complete
The value of ammonia water is low, storage tanks are required for storage, and there is a certain amount of waste
The tail gas of melamine packaging also contains a large amount of ammonia. If it is not recycled, it will also cause environmental problems and waste ammonia.

Method used

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  • Tail gas absorption process and device in melamine production process

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Effect test

Embodiment 1

[0025] Such as figure 1 Shown, the used device of the tail gas absorption process in the melamine production process of the present invention comprises Roots fan 3, water absorption tower 4, cyclone separator 5 and acid absorption tower 7 connected successively; Acid absorption tower 7 consists of the following A packing section 10, a bubble cap section 9 and a mist eliminator 8 are set up in sequence; the air inlet at the lower end of the packing section 10 of the acid absorption tower 7 is connected with the gas outlet of the cyclone separator 5, and the liquid inlet at the upper end is connected with the acid absorption liquid pipeline 16 are connected; the top of the acid absorption tower 7 is connected with a tail gas discharge pipeline 6.

[0026] The Roots blower 3 is connected with the melamine packaging tail gas pipeline 1 and the urea melting tail gas pipeline 2 .

[0027] The liquid outlet at the lower end of the packing section 10 of the acid absorption tower 7 is...

Embodiment 2

[0031] Adopt the tail gas absorption device of embodiment 1 to absorb the tail gas in the melamine production process of our company, the tail gas absolute pressure is 101.3KPa, the ammonia gas content is 2-4%, and contains trace melamine and urea, the steps are as follows:

[0032] (1) Water absorption: After the exhaust gas is boosted by the Roots blower, enter the water absorption tower, use water to absorb ammonia, urea and melamine in the tail gas, control the ammonia concentration of the water absorption tower between 6-8wt%, and then enter the cyclone separator for separation;

[0033] (2) Acid absorption: the tail gas after separation enters the packing section of the acid absorption tower, and the ammonia in the tail gas is further absorbed with 5wt% nitric acid, and the acid absorption liquid is recycled through a circulating pump to control the pH value of the acid absorption liquid When the pH value of the acid absorption liquid is greater than 5, the acid absorpti...

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Abstract

The invention relates to the technical field of tail gas treatment, in particular to a tail gas absorption process and device in the melamine production process. The tail gas absorption process in themelamine production process comprises the following steps that tail gas in the melamine production process enters a water absorption tower after being boosted by a Roots blower, ammonia gas, urea andmelamine in the tail gas are absorbed by water, then the tail gas enters a cyclone separator to be separated,the separated tail gas enters a packing section of an acid absorption tower, ammonia gas in the tail gas is further absorbed by acid absorption liquid, then the tail gas enters a bubble cap section, acid mist is absorbed by desalted water, and finally the tail gas is separated by an efficient demister and is discharged after reaching the standard. According to the tail gas absorption process and device in the melamine production process, ammonia gas contained in tail gas is effectivelyabsorbed, the treated tail gas does not contain acid mist, energy is saved, environment friendliness is achieved, and consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of tail gas treatment, in particular to a tail gas absorption process and device in the production process of melamine. Background technique [0002] In the production process of melamine, solid urea is used as raw material. During the melting process of urea, urea will be decomposed to form a mixed gas of ammonia and carbon dioxide. If this part of gas diffuses into the air, it will cause air pollution. In addition, a large amount of exhaust gas is also produced during the packaging process of melamine. These two parts of the tail gas contain a large amount of ammonia, the concentration is about 4%, and also contain trace amounts of melamine and urea. [0003] The traditional tail gas treatment process absorbs the ammonia gas with water. Because the partial pressure of the ammonia gas is too low, the absorption efficiency is very low. There will be ammonium bicarbonate crystallization, and the absorption ...

Claims

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Application Information

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IPC IPC(8): B01D53/18B01D53/14C01C1/18C05C1/00
CPCB01D53/18B01D53/1418B01D53/1487C01C1/185C05C1/00B01D2257/406B01D2257/40Y02P20/10
Inventor 齐元山赵大学尹连伟
Owner HOLITECH TECH CO LTD
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