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Method for reducing NOX concentration in tail gas of waste acid cracking device

An acid cracking and tail gas technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve problems such as loss, and achieve the effects of high operating flexibility, easy maintenance, and high denitrification rate.

Inactive Publication Date: 2017-05-31
JIANGSU KERUI ENG DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the waste acid cracker has not yet targeted nitrogen oxides (NO x ) emission concentration to formulate specific standards, and because conventional denitrification devices remove nitrogen oxides, they will also treat SO 2 How to reduce the loss of sulfur and control the amount of ammonia escape in the denitrification process is also the difficulty of the denitrification process on the waste acid cracking device. The completed waste acid cracking device does not have a process flow for the denitrification device

Method used

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Effect test

Embodiment 1

[0032] A method for reducing NO in tail gas of waste acid cracking unit X Concentration process, the converted flue gas of the waste acid cracking acid plant is converted from the fifth stage of the converter, and after heat exchange through the waste heat recovery device (1), the flue gas temperature is 390 °C and the pressure is 9KPa (table), which is detected by the flue gas online System (2), analyzing NO X Content 394mg / m 3 , into the SCR reactor (3), the liquid ammonia storage tank (4) provides the reducing agent NH 3 , in the liquid ammonia evaporator (5), it is heated by low-pressure steam to produce ammonia gas, which passes through the ammonia buffer tank (6), fully mixes with compressed air in the ammonia-air mixer (7), and enters the SCR reactor installed The spray grid (8) in the front section enters the catalyst bed together with the flue gas entering the reactor to undergo a catalytic reduction reaction. The catalyst bed has two layers to generate non-toxic an...

Embodiment 2

[0034] A method for reducing NO in tail gas of waste acid cracking unit X Concentration process, the converted flue gas of the waste acid cracking acid plant is converted from the fifth-stage conversion outlet of the converter, and after heat exchange through the economizer (1), the flue gas temperature is 385°C and the pressure is 9KPa (table), which is detected by the flue gas on-line System (2), analysis of NO X Content 410mg / m3 , into the SCR reactor (3), the liquid ammonia storage tank (4) provides the reducing agent NH 3 , in the liquid ammonia evaporator (5), it is heated by low-pressure steam to produce ammonia gas, which passes through the ammonia buffer tank (6), fully mixes with compressed air in the ammonia-air mixer (7), and enters the SCR reactor installed The spray grid (8) in the front section enters the catalyst bed together with the flue gas entering the reactor to undergo a catalytic reduction reaction. The catalyst bed has 3 layers to generate non-toxic an...

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Abstract

The invention relates to a method for reducing NOX concentration in a tail gas of a waste acid cracking device. After the exhaust gas at an outlet of a fifth section of an acid-making converter is adjusted by a heat exchanger or a waste heat recovery device, a SCR selective catalytic reduction reactor is introduced, a reducing agent (such as NH3 and ammonium hydroxide) and a catalyst are utilized to selectively react with NOx in the tail gas and generate non-toxic and pollution-free N2 and H2O, and then the reducing agent NH3 is oxidized into N2 and H2O through an oxidation catalyst layer at the tail end of the SCR reactor and the N2 and H2O are discharged together with the tail gas of a tail absorbing tower. A selective catalytic reduction system is composed of a catalyst reactor, an ammonia supplying device, an ammonia jetting device and related detection equipment and instrument control instruments. The selective catalytic reduction system has the advantages of compact structure, less occupied space, convenience in maintenance and low investment cost.

Description

technical field [0001] The invention belongs to the technical field of chemical environmental protection, and in particular relates to an effective control of NO in the tail gas of acid production in a waste acid cracking acid production device x Emission concentration process. Background technique [0002] The invention relates to an effective control of NO in the tail gas of acid production in a waste acid cracking acid production device x Emission concentration process. The alkylation waste acid cracking process includes a waste acid cracking unit, a purification unit, a dry absorption unit and a conversion unit. In the regenerated flue gas from the outlet of the five-stage conversion of the conversion unit, except for the relatively high content of SO 3 , a lower content of SO 2 , and NO produced at high temperature x , NO x It will not affect the acid production in the subsequent reaction process, but if it is directly discharged into the atmosphere in the tail ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56B01D53/86B01D53/58
CPCB01D53/90B01D53/8628B01D53/8634B01D53/869B01D2251/2062B01D2255/20723B01D2255/20769B01D2255/20776B01D2255/30B01D2258/0283
Inventor 李颖魏兰江碧清徐晓燕吴英来罗娟李皓瑜张雪杰张成昆赵建鑫孟建
Owner JIANGSU KERUI ENG DESIGN CO LTD
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