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Method for regenerating flue gas denitration catalyst with high phosphorus and high alkali metal content

A denitrification catalyst and flue gas technology, applied in the direction of catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of inability to clean catalyst pores, ineffective effects, limited effects, etc.

Inactive Publication Date: 2014-12-24
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The Chinese invention patent with the application publication number of CN 102909104A discloses a heat treatment regeneration method and device for SCR denitrification catalysts. The regeneration method includes a soot blowing process of the deactivated catalyst and a heat treatment regeneration process of the catalyst, wherein the heat treatment regeneration process is to process the soot blowing The final catalyst is loaded into the regenerative reactor and fed with NH 3 and N 2 The mixed gas is heat-treated at a furnace temperature of 360°C to 420°C for 3h to 5h. Thermophysics can recover part of the activity, but the effect is limited and the blocked catalyst channels cannot be removed.
[0004] The Chinese invention patent with the application publication number CN 102658170A discloses a vanadium-titanium-based honeycomb SCR denitration catalyst regeneration process and device. The catalyst is subjected to pressurized water spraying, ultrasonic cleaning, secondary pressurized water spraying, pickling, Blast drying, active component supplementation, secondary blast drying, distributed calcination and other steps for regeneration, this process can restore the activity of the deactivated catalyst and maintain the structural strength, but this method is mainly for alkali metal and alkaline earth metal poisoning, for Phosphorus poisoning water washing and pickling methods have no obvious effect
[0005] The Chinese invention patent with the application publication number of CN 102026721A discloses a regeneration method of an SCR catalyst poisoned by phosphorus in flue gas, using alkali metal hydroxides such as sodium hydroxide and potassium hydroxide to clean the catalyst and replace the Phosphorus, and then use acid to neutralize excess hydroxide. This method can be used to dispose of phosphorus poisoned catalysts, because the causes of catalyst poisoning are complex, usually both alkali metals, alkaline earth metals, and other elements such as phosphorus poisoning, but this method Does not involve alkali metal and alkaline earth metal poisoning regeneration method

Method used

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  • Method for regenerating flue gas denitration catalyst with high phosphorus and high alkali metal content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Extract a deactivated honeycomb catalyst monomer from a power plant, with a size of 150×150×1200mm. The coal quality of the power plant has a high content of phosphorus and potassium elements. The denitrification efficiency of the catalyst was tested in the test conditions: the flue gas temperature was 375°C, the space velocity was 4000L / h, the ammonia nitrogen ratio was 1.0, and the denitrification efficiency of the catalyst before cleaning was 55%.

[0020] Add deionized water into the air bubbling water washing tank, configure lye in the ultrasonic lye cleaning tank, the lye is potassium hydroxide aqueous solution with a concentration of 0.01mol / L, and add penetration enhancer JFC accounting for 1‰ of the total mass of lye , The temperature of the lye is 25°C. The acid solution is prepared in the ultrasonic pickling tank, the concentration of dilute sulfuric acid is 0.5mol / L, the penetration enhancer JFC accounting for 1‰ of the total mass of the acid solution is add...

Embodiment 2

[0023] Another catalyst monomer was taken as a test module, and its denitration efficiency was tested in a denitration activity evaluation device. The test conditions were the same as in Example 1, and the denitration efficiency of the catalyst before cleaning was measured to be 57%.

[0024] Add deionized water into the air bubbling water washing tank, configure lye in the ultrasonic lye cleaning tank, the lye is potassium hydroxide aqueous solution with a concentration of 0.05mol / L, and add penetration enhancer JFC accounting for 1‰ of the total mass of lye , the temperature of the lye is 50°C. Acid solution is prepared in the ultrasonic pickling tank, the concentration of dilute sulfuric acid is 0.5mol / L, the penetration enhancer JFC accounting for 1‰ of the total mass of the acid solution is added, and the temperature of the acid solution is 50°C. Add deionized water to the air-bubble rinse tank.

[0025] Put the catalyst monomer in the air bubbling pool, open the ball va...

Embodiment 3

[0027] A single catalyst was taken as a test module, and its denitration efficiency was tested in a denitration activity evaluation device. The test conditions were the same as in Example 1, and the denitration efficiency of the catalyst before cleaning was measured to be 5%.

[0028] Add deionized water into the air bubbling water washing tank, configure lye in the ultrasonic lye cleaning tank, the lye is an aqueous solution of sodium hydroxide with a concentration of 0.5mol / L, and add a penetration enhancer JFC accounting for 3‰ of the total mass of lye , The temperature of the lye is 25°C. Acid solution is prepared in the ultrasonic pickling tank, the concentration of dilute sulfuric acid is 0.5mol / L, the penetration enhancer JFC accounting for 3‰ of the total mass of the acid solution is added, and the temperature of the acid solution is 25°C. Add deionized water to the air-bubble rinse tank.

[0029] Put the catalyst monomer in the air bubbling pool, open the ball valve ...

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Abstract

The invention belongs to the technical field of methods for regenerating a deactivated denitration catalyst, and particularly relates to a method for regenerating a flue gas denitration catalyst with high phosphorus and high alkali metal content. The method comprises the following steps: sequentially carrying out air bubble washing, ultrasonic alkali cleaning, ultrasonic acid cleaning, air bubble rinsing and drying for the deactivated catalyst for catalyst regeneration. The given regeneration process parameters comprise the time of air bubble washing, the ingredients of alkali cleaning liquor and acid cleaning liquor, drying temperature and drying time. Compared with the current SCR denitrification catalyst regeneration process, the method can simultaneously remove poisoning elements such as phosphorus and alkali metal in the catalyst.

Description

technical field [0001] The invention belongs to the technical field of regeneration methods for deactivated denitrification catalysts, in particular to a regeneration method for flue gas denitrification catalysts with high phosphorus and high alkali metal content. Background technique [0002] Selective catalytic reduction (SCR) is the most important denitrification technology for coal-fired power plants in my country at present. The catalyst is an important component of the SCR system, and its performance directly affects the denitrification efficiency of the SCR system. At present, SCR catalysts are mainly honeycomb type, flat type and corrugated plate type, and the main components are TiO 2 , V 2 o 5 、WO 3 、MoO 3 . At present, the flue gas denitrification projects of coal-fired power plants in my country adopt high-temperature and high-dust layouts. The catalysts operate under harsh flue gas conditions for a long time. Elements such as potassium and phosphorus in the...

Claims

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Application Information

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IPC IPC(8): B01J38/48B01J38/60B01J38/64B01J38/02
Inventor 宋蔷姚强崔一尘郑娜
Owner TSINGHUA UNIV