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Inactivated SCR (selective catalytic reduction) flue gas denitration catalyst regeneration process

A denitration catalyst and catalyst technology, applied in the field of solid waste resource utilization, can solve the problems of high environmental pollution of waste catalysts and high cost of SCR catalysts, and achieve the effects of improving pore structure and surface conditions, better catalytic activity, and strong applicability

Pending Publication Date: 2021-07-02
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a deactivated SCR flue gas denitrification catalyst regeneration process, which can effectively clean and regenerate the deactivated SCR denitrification catalyst, the regeneration process is environmentally friendly, and the cleaning solution preparation method Simple and low cost; it solves the problems of high cost of direct replacement of SCR catalyst and great environmental pollution caused by waste catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A deactivated SCR flue gas denitrification catalyst regeneration process, comprising the following steps:

[0032] 1) Take the deactivated SCR flue gas denitrification catalyst that has been running continuously for 20000 hours, cut out a 25*25*80mm square from the inside, use the pressure of 0.2MPa, and the flow rate of 0.3m 3 / s of dry oil-free compressed air blows and removes dust for 30 minutes against the direction in which the flue gas passes through the catalyst, and removes the dust on the surface and in the pores;

[0033] 2) Place the SCR flue gas denitrification catalyst obtained in step 1) in an ultrasonic device equipped with a chemical cleaning solution A at a temperature of 15°C and immerse for 1 hour. Finally, drain the water; among them, in the chemical cleaning solution A, H 2 SO 4 The molar concentration is 0.5mol / L, and the mass fraction of sodium dodecyl sulfate is 0.1%;

[0034] 3) Immerse the SCR flue gas denitrification catalyst obtained in st...

Embodiment 2

[0039] A deactivated SCR flue gas denitrification catalyst regeneration process, comprising the following steps:

[0040] 1) Take the deactivated SCR flue gas denitrification catalyst that has been running continuously for 20,000 hours, cut out a 25*25*80mm square from the inside, use the pressure of 0.5MPa, and the flow rate of 0.5m 3 / s of dry oil-free compressed air blows and removes dust for 1.5 hours against the direction that the flue gas passes through the catalyst, and removes the dust on the surface and in the pores;

[0041] 2) Place the SCR flue gas denitrification catalyst obtained in step 1) in an ultrasonic device equipped with a chemical cleaning solution A at a temperature of 50°C for 2 hours. During the immersion, ultrasonically clean it for 5 minutes every 10 minutes at an ultrasonic frequency of 100 KHz, and the immersion is completed. Finally, drain the water; among them, in the chemical cleaning solution A, H 2 SO 4 The molar concentration is 1.5mol / L, a...

Embodiment 3

[0047] A deactivated SCR flue gas denitrification catalyst regeneration process, comprising the following steps:

[0048] 1) Take the deactivated SCR flue gas denitrification catalyst that has been running continuously for 20,000 hours, cut out a 25*25*80mm square from the inside, use the pressure of 0.3MPa, and the flow rate of 0.4m 3 / s of dry oil-free compressed air blows and removes dust for 1 hour against the direction in which the flue gas passes through the catalyst, and removes the dust on the surface and in the pores;

[0049] 2) Place the SCR flue gas denitrification catalyst obtained in step 1) in an ultrasonic device equipped with a chemical cleaning solution A at a temperature of 25°C for 1 hour and immerse for 1 hour. During the immersion, ultrasonically clean it for 5 minutes every 10 minutes at an ultrasonic frequency of 50 KHz, and the immersion is completed. Finally, drain the water; among them, in the chemical cleaning solution A, H 2 SO 4 The molar concen...

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Abstract

The invention discloses an inactivated SCR (selective catalytic reduction) flue gas denitration catalyst regeneration process which comprises the following steps: firstly, carrying out blowing dust removal on an inactivated SCR flue gas denitration catalyst to remove accumulated dust on the surface and in pores; dipping the SCR flue gas denitration catalyst in a chemical cleaning solution A for ultrasonic cleaning, dipping the SCR flue gas denitration catalyst in a chemical cleaning solution B, washing and drying, and dipping the dried SCR flue gas denitration catalyst in a pore repairing solution C for repairing and drying pores of the catalyst; and placing the SCR flue gas denitration catalyst in a constant-temperature and constant-humidity mist device to be treated and then calcined and regenerated. The operation mode is simple, the applicability is high, the cost is low, and the good regeneration effect can be achieved for inactivation denitration catalysts of different structures and different types.

Description

technical field [0001] The invention relates to the technical field of resource utilization of solid waste, in particular to a regeneration process for a deactivated SCR flue gas denitrification catalyst. Background technique [0002] At present, the most mature, most and most effective flue gas denitrification process in the world is the selective catalytic reduction (SCR) process, which is widely used in the treatment of flue gas from coal-fired power plants and coking flue gas, and among them, The denitrification catalyst is the core of the process. The theoretical chemical life of commonly used vanadium-titanium catalysts is about 22,000 hours, and the mechanical life is 10 years. However, in actual production, the life of the catalyst is greatly shortened due to factors such as the quality of the catalyst itself and the operating conditions. At present, the service life of commercially available catalysts is about 3 years, and tens of thousands of tons of spent denitri...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/92B01J38/02B01J38/04B01J38/50B01J38/52B01J38/60B01J38/64
CPCB01J38/60B01J38/50B01J38/64B01J38/52B01J38/04B01J38/02B01J23/30B01J23/92
Inventor 刘瑛付本全王大春简科康凌晨张华
Owner 武汉钢铁有限公司
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