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Nitrophosphate tail gas deamination device and nitrophosphate tail gas deamination process

A nitrophosphate fertilizer and tail gas technology, applied in the chemical industry, can solve the problems of great difficulty in deamination, achieve the effects of overcoming adverse effects, low fan power consumption, and stable and reliable operation

Inactive Publication Date: 2013-12-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These properties of nitrophosphate tail gas make deamination very difficult

Method used

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  • Nitrophosphate tail gas deamination device and nitrophosphate tail gas deamination process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Under normal temperature conditions, nitric acid solution is used as the absorbent, adjust the pH of the absorption solution to 3, the absorption solution is pumped and circulated, and dispersed into droplets through the spray device on the top of the tower. The measured droplet diameter is about 2.8mm, which is the same as that entering The ammonia-containing tail gas is subjected to countercurrent contact, and the spray density is controlled to be 89m 3 / (m 2 ﹒ h), the superficial gas velocity is 1.95m / s, the NH in the tail gas 3 It is removed by chemical reaction with nitric acid in the absorption liquid. After the purified tail gas passes through the mist eliminator to remove the entrained fine droplets, it is emptied by the induced draft fan, and the absorption liquid is discharged from the tower kettle. Absorption tower inlet NH 3 The content is 3000mg / m 3 , the export content is 419mg / m 3 , The deamination efficiency is 86%.

Embodiment 2

[0022] At room temperature, the nitric acid solution is used as the absorbent, adjust the pH of the absorption solution to 3, and the absorption solution is pumped to the spray device with a circulating pump, dispersed into droplets with a diameter of about 2.8mm, and countercurrently contacted with the ammonia-containing tail gas entering from the bottom of the tower to control The spray density is 140m 3 / (m 2 ﹒ h), the superficial gas velocity is 1.95m / s, the NH in the tail gas 3 Chemical reaction with nitric acid, NH 3 was removed. The tail gas after deamination is removed by the mist eliminator to remove the entrained liquid droplets, and then is drawn out by the induced draft fan to be emptied, and the kettle liquid is discharged out of the absorption system. Absorption tower inlet NH 3 The content is 3000mg / m 3 , the measured outlet ammonia content was 187 mg / m 3 , The deamination efficiency is 93.8%.

Embodiment 3

[0024]Control the inlet ammonia-containing tail gas temperature at 70°C, absorbing liquid temperature at 45°C, use nitric acid solution as the absorbent, adjust the absorbing liquid pH=3, and circulate the pump to transport the absorbing liquid to the spray device for dispersion. The droplet diameter is about 2.8mm, which is the same as that from The ammonia-containing tail gas entering the bottom of the tower is contacted in countercurrent, and the spray density is controlled to be 140m 3 / (m 2 ﹒ h), the superficial gas velocity is 1.95m / s, the NH in the tail gas 3 Chemically reacts with nitric acid and is removed. After the purified exhaust gas is demistered by the demister, it is discharged by the induced draft fan, and the absorption liquid in the tower kettle is led out of the absorption system. Absorption tower inlet NH 3 The content is 3000mg / m 3 , the export content is 232 mg / m 3 , The deamination efficiency is 92.3%.

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Abstract

The invention discloses a nitrophosphate tail gas deamination device and a nitrophosphate tail gas deamination process. The device mainly comprises a spray tower, an absorption liquid circulation pump, a nitric (phosphoric) acid solution storage tank, a nitric (phosphoric) acid solution charge pump, a static mixer, an absorption liquid cooler, a multi-gear demister and an induced draft fan, wherein the bottom of the spray tower is an absorption liquid pool, and a spray layer is arranged on the upper part of the spray tower; the absorption liquid pool is connected with the spray layer via the circulation pump, the mixer and the cooler; the mixer is connected with the nitric (phosphoric) acid solution storage tank; the demister and the induced draft fan are arranged at the outlet of the tower; and the absorption liquid pool is connected with a main production line for nitrophosphate. The process disclosed by the invention is as follows: tail gas enters from the lower part of the tower, and flows through spray sections from bottom to top to be absorbed, a gas leaving from the top of the tower is demisted by the demister, and emptied by the induced draft fan; an absorption liquid is conveyed by the circulation pump and conveyed to the spray layer after through the cooler; fresh nitric (phosphoric) acid solution is pumped in the mixer from a storage groove by a pump, and mixed in the absorption liquid; the generated ammonium nitrate (phosphate) is absorbed, and conveyed to the main production line to produce nitrophosphate.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a nitric (phosphoric) acid phosphate fertilizer tail gas deammonization device and process. Background technique [0002] Nitrophosphate fertilizer is a high-efficiency compound fertilizer rich in nitrogen and phosphorus. In the production process of nitrophosphate fertilizer, the neutralization tail gas containing ammonia is produced in the neutralization section, and the conversion tail gas containing ammonia is produced in the transformation section. These two streams of ammonia-containing tail gas are processed by the ammonia absorption tower and then enter the tail gas main pipe to be discharged into the atmosphere. At present, the ammonia absorption tower used in the factory is a packed tower, which uses the process waste liquid as the absorbent to scrub the ammonia-containing tail gas. Since the hydrogen fluoride gas in the tail gas dissolves into the absorption liquid to...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/58
Inventor 叶世超祝杰吴振元
Owner SICHUAN UNIV