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Sulfur trioxide removal apparatus and method for flue gas purification facility comprising SCR denitration system

A sulfur trioxide and flue gas purification technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve problems such as air preheater blockage, low load forced retreat, catalyst failure, etc.

Pending Publication Date: 2021-12-21
CPI YUANDA ENVIRONMENTAL PROTECTION ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent application CN104474897A proposes that in the SCR denitrification system, SO 3 May interact with water vapor, NH 3 The reaction produces H 2 SO 4 and NH 4 HSO 4 , deposited on the SCR catalyst reactor and the air preheater, causing catalyst failure and air preheater blockage, resulting in forced retreat at low load, catalyst deactivation, air preheater blockage, etc. Problems that affect the denitrification efficiency of coal-fired power plants and the normal operation of units
[0004] However, in the above method, although the amount of chemical agent is very high, the removal effect is not ideal

Method used

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  • Sulfur trioxide removal apparatus and method for flue gas purification facility comprising SCR denitration system
  • Sulfur trioxide removal apparatus and method for flue gas purification facility comprising SCR denitration system
  • Sulfur trioxide removal apparatus and method for flue gas purification facility comprising SCR denitration system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] use figure 2 The shown sulfur trioxide removal equipment removes sulfur trioxide from the flue gas of the flue gas purification facility including the selective catalytic reduction SCR denitrification system.

[0087] The injection grid is located at the straight pipe section of the SCR outlet of the flue gas purification facility. The measured flue gas temperature upstream of this position is 340 °C, where SO 3 The content is 131mg / Nm 3 . The flue gas is standard, containing 6% O 2 of dry smoke. Furthermore, here the flow field in the flue is uniform.

[0088] Choose sodium carbonate (Na 2 CO 3 ) is the absorbent, which is finely ground to a particle size of 20mm or less, filled into the absorbent dissolution tank, and at the same time, desalted water is passed into the absorbent dissolution tank, and heated to 40°C to form an absorbent with a mass concentration of 18% solution. Absorbent solution at 1.8m 3 / h flow to the atomizing nozzle. Compressed air pr...

Embodiment 2

[0095] use image 3 The shown sulfur trioxide removal equipment removes sulfur trioxide from the flue gas of the flue gas purification facility including the selective catalytic reduction SCR denitrification system. Wherein, a plurality of spray guns are arranged in the flue.

[0096] The position of the spray gun is at the straight pipe section of the SCR outlet of the flue gas purification facility. At this position, the measured flue gas temperature is 330°C, where SO 3 The content is 88mg / Nm 3 . Furthermore, the flow field in the flue is uniform.

[0097] Choose sodium carbonate as the absorbent, grind it finely until the particle size is less than 20mm, fill it into the absorbent dissolution tank, and at the same time pass desalted water into the absorbent dissolution tank, and heat it to 40°C to form a 20% mass concentration absorbent solution. Absorbent solution in 1.5m 3 / h flow to the spray gun. Compressed air pressure is 3.2bar, at 250m 3 / h flow to the spra...

Embodiment 3

[0104] Similar to Example 2, using image 3 The shown sulfur trioxide removal equipment removes sulfur trioxide from the flue gas of the flue gas purification facility including the selective catalytic reduction SCR denitrification system. The difference is that the spray gun is arranged upstream of the ammonia injection device of the SCR system. In addition, a bag filter is installed in front of the SCR reactor. The experimental results show that the flue gas entering the SCR system is fully desulfurized, and the problem of catalyst deactivation due to sulfur trioxide in the SCR reactor is completely avoided. At the same time, the flue gas temperature does not decrease significantly, and the SCR reaction can proceed normally.

[0105] The equipment and method of the present invention achieve excellent sulfur trioxide removal effect with a lower amount of absorbent by atomizing and spraying the absorbent solution.

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Abstract

The invention provides a sulfur trioxide removal apparatus for a flue gas purification facility and a corresponding method. The flue gas purification facility comprises a selective catalytic reduction (SCR) denitration system, the equipment comprises an absorbent dissolving tank, a compressed gas source and an atomizing and spraying unit, and the atomizing and spraying unit atomizes an absorbent solution through compressed gas and sprays the absorbent solution into a flue located on the upstream and / or downstream of the SCR denitration system. According to the equipment and the method disclosed by the invention, the absorbent solution is atomized and sprayed, so that an excellent desulfurization effect is achieved on the flue gas in the SCR denitration system at a relatively low absorbent dosage.

Description

technical field [0001] The invention relates to the field of flue gas desulfurization, in particular to a sulfur trioxide removal device and method for a flue gas purification facility including a selective catalytic reduction (SCR) denitrification system. Background technique [0002] Selective catalytic reduction (SCR) system has been widely used in coal-fired units containing nitrogen oxides (NO x ) in flue gas purification treatment. The SCR denitrification system converts the nitrogen oxides in the flue gas into nitrogen through a catalyst, so as to achieve efficient flue gas denitrification. [0003] However, with the popularization of SCR denitrification system, sulfur trioxide (SO 3 ) related to new issues. On this issue, preliminary explorations have been carried out. For example, Chinese patent application CN103055684A proposes that the sulfur trioxide content in the flue gas discharged from the SCR denitrification system increases, and causes corrosion and blo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56B01D53/18B01D53/14
CPCB01D53/8628B01D53/18B01D53/1481B01D2258/0283
Inventor 王济平陈建宏
Owner CPI YUANDA ENVIRONMENTAL PROTECTION ENG