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Method for reproducing medium pressure steam by flare gas generated in synthesis ammonia production process

A technology for synthesizing ammonia and torches, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve problems such as human and environmental impact, and achieve the effects of low device construction cost, realization of waste utilization, and improvement of decyanation devices.

Active Publication Date: 2013-04-24
营口德瑞化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if there is even a small amount of leakage of sodium cyanide tail gas in the process, hydrogen cyanide will cause very harmful effects on people and the environment

Method used

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  • Method for reproducing medium pressure steam by flare gas generated in synthesis ammonia production process

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Experimental program
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Effect test

Embodiment 1

[0023] The tail gas discharged from the sodium cyanide production unit is sent to the cooler, the imported hydrogen cyanide content is 50ppm, cooled to below 30°C by the cooler, and then pumped to the decyanation device by a water ring vacuum pump. The decyanation device adopts an alkali mist spray purification tower , and is equipped with a defoaming separator at the outlet. The supporting lye circulation system adopts a layer of bubbling, top spray purification, and four-stage absorption. The alkali used becomes sodium cyanide after absorbing cyanide, which can be supplied to sodium cyanide The workshop is used as raw material for products. The content of hydrogen cyanide in the outlet is ≦0.2ppm, and the purification efficiency can reach 97.8%; the ammonia is sent to the deammonization device to make the ammonia content ≦5ppm; the trace sulfur is sent to the desulfurization device to make the sulfur content≦0.2ppm; the cyanide The tail gas discharged from the sodium chl...

Embodiment 2

[0026]Cool the tail gas discharged from the sodium cyanide production unit to below 30°C through the cooler, and pump it to the decyanation device to remove hydrogen cyanide with a water ring vacuum pump, so that the hydrogen cyanide content is ≦0.2ppm. The decyanation device is purified by alkali mist spraying The tower is equipped with a defoaming separator at the outlet. The supporting lye circulation system adopts a layer of bubbling, top spray purification, and four-stage absorption. The purification efficiency can reach 95%-98%; the deammonization device removes the ammonia, so that the ammonia content is ≦5ppm; the tail gas from decyanation and deamination is pumped to the desulfurization device to remove trace sulfur, so that the sulfur content is ≦0.2ppm; The exhaust gas is mixed, and the mixing ratio is 4:1. After mixing the tail gas of sodium cyanide and chlor-alkali, it is sent to the deoxygenation device to remove the oxygen. The deoxygenation tower of the deoxida...

Embodiment 3

[0031] Cool the tail gas discharged from the sodium cyanide production unit to below 30°C through the cooler, and pump it to the decyanation device to remove hydrogen cyanide with a water ring vacuum pump, so that the hydrogen cyanide content is ≦0.2ppm. The decyanation device is purified by alkali mist spraying The tower is equipped with a defoaming separator at the outlet. The supporting lye circulation system adopts a layer of bubbling, top spray purification, and four-stage absorption. The purification efficiency can reach 95%-98%; the deammonization device removes the ammonia, so that the ammonia content is less than or equal to 5ppm; use a vacuum pump to pump the tail gas of decyanation and deamination to the desulfurization device to remove the trace sulfur. The desulfurization device uses activated carbon fine desulfurizer, the model is WT102 type activated carbon fine desulfurizer, the manufacturer is Ruian Yaoxing Gas Purifier Co., Ltd., so that the sulfur content...

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Abstract

A method for reproducing medium pressure steam by flare gas in the synthesis ammonia production process belongs to the field of petrochemical engineering utilization. The medium pressure steam is produced by desorbed gas, discharged gas and unacceptable raw material gas produced during the process that sodium cyanide or chlor-alkali tail gas are used for producing synthesis ammonia, and is produced through the following steps: sodium cyanide tail gas is subjected to hydrogen cyanide removal by a decyanation device after being cooled, so that the content of hydrogen cyanide is less than or equal to 0.2 ppm; ammonia in the sodium cyanide tail gas is removed by a deamination device, so that the content of ammonia is less than or equal to 5 ppm; trace sulfur of the sodium cyanide tail gas is removed by a desulfurization device, so that the content of sulfur is less than or equal to 0.2 ppm; the sodium cyanide tail gas subjected to hydrogen cyanide removal, ammonia removal and sulfur removal is mixed with chlor-alkali tail gas to obtain a mixture, the mixture is sent to a deoxidation device for deoxidation, so that the content of oxygen is less than or equal to 10 ppm; the mixture is sent to a PSA (Pressure Swing Adsorption) device for purifying hydrogen; and desorbed gas in PSA dehydrogenation as well as discharged gas and unacceptable raw material gas is sent to a gas buffer to be mixed and then is sent to a boiler to produce the medium pressure steam. The medium pressure steam can provide steam for the synthesis ammonia production process and a heater.

Description

technical field [0001] The present invention relates to the utilization method of the tail gas of chemical enterprises producing sodium cyanide or chlor-alkali, in particular to the use of desorption gas, air release and unqualified raw material gas produced in the process of producing synthetic ammonia with sodium cyanide or chlor-alkali tail gas to reproduce medium-pressure steam Methods. Background technique [0002] Chemical enterprises that produce sodium cyanide or chlor-alkali produce a large amount of tail gas. The traditional method is to discharge the tail gas into the atmosphere, which wastes resources and causes environmental pollution. In order to utilize the tail gas produced by the production of sodium cyanide or chlor-alkali, the applicant disclosed a patent No. ZL200710010222.1 "A method for producing synthetic ammonia by purifying hydrogen from the tail gas of sodium cyanide and chlor-alkali". And / or chlor-alkali tail gas is subjected to boosting, heating,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/50B01D53/00B01D53/78
Inventor 刘庆晨安宝均刘至柔于希华朱维国安东亮
Owner 营口德瑞化工有限公司