Denitrification catalyst regeneration method

A denitrification catalyst and catalyst technology, applied in the direction of catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of large catalyst hardness damage, catalyst breakage and cracks, insufficient ultrasonic power, etc., to achieve Improved pore structure and surface area, high cleaning efficiency, and easy operation

Inactive Publication Date: 2013-03-20
CECEP L&T ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current research on cleaning and regeneration technology is by means of ultrasonic waves, mechanical cleaning or chemical agents (surface penetrating agents, pore expanders, etc.), such as Chinese patents 200910031207.4 and 201110235622.9, which use mechanical cleaning devices to remove catalyst ash and deposits, but mechanical

Method used

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  • Denitrification catalyst regeneration method

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Experimental program
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Effect test

Embodiment 1

[0019] 1. Take the test module (53mm×53mm×300mm) of waste denitration catalyst from the power plant and test the denitration efficiency of the denitration catalyst under simulated flue gas conditions, which is 47%.

[0020] 2. Completely immerse the denitrification catalyst test module in the cleaning pool containing 0.5% dilute sulfuric acid, turn on the ultrasonic generator, take out the catalyst module after immersion for 30 minutes, and soak it in deionized water for 30 minutes.

[0021] 3. Dry the obtained catalyst in an oven at 260° C. for 3 hours, and ensure that the moisture in the oven is removed in time, and complete the catalyst regeneration process after cooling.

[0022] 4. The denitrification efficiency of the catalyst was tested under simulated flue gas conditions to be 57.6%.

[0023] Catalyst activity test conditions: set up an experimental platform, put the catalyst in a fixed tubular heater, and inject simulated flue gas (SO 2 =800ppm, NOx=NH 3 =600ppm, O ...

Embodiment 2

[0028] 1. Prepare an ammonium carbonate cleaning solution with a mass fraction of 1%.

[0029] 2. The test module (53mm×53mm×300mm) of the waste denitrification catalyst of the power plant was intercepted, and the denitrification efficiency of the denitrification catalyst was tested under the simulated flue gas condition to be 47%.

[0030] 3. Completely immerse the denitrification catalyst test module in the cleaning tank containing 1% ammonium carbonate cleaning solution by mass fraction, stagnate for 30 minutes, transfer to the cleaning tank containing deionized water and immerse for 30 minutes.

[0031] 4. Dry the obtained catalyst in an oven at 260° C. for 3 hours, and ensure that the moisture in the oven is removed in time, and complete the catalyst regeneration process after cooling.

[0032] 5. The denitrification efficiency of the catalyst was tested under simulated flue gas conditions to be 68%.

[0033] Catalyst activity test condition is the same as embodiment 1. ...

Embodiment 3

[0035] 1. Prepare an ammonium carbonate cleaning solution with a mass fraction of 2%.

[0036] 2. The test module (53mm×53mm×300mm) of the waste denitrification catalyst of the power plant was intercepted, and the denitrification efficiency of the denitrification catalyst was tested under the simulated flue gas condition to be 47%.

[0037] 3. Completely immerse the denitrification catalyst test module in the cleaning tank containing 2% ammonium carbonate cleaning solution by mass fraction, stagnate for 30 minutes, transfer to the cleaning tank containing deionized water and immerse for 30 minutes.

[0038] 4. Dry the obtained catalyst in an oven at 240-320°C for 3 hours, and ensure that the moisture in the oven is removed in time, and complete the catalyst regeneration process after cooling.

[0039] 5. The catalyst denitrification efficiency is 71.3% under simulated flue gas conditions.

[0040] Catalyst activity test condition is the same as embodiment 1.

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Abstract

The invention relates to a denitrification catalyst regeneration method. The denitrification catalyst regeneration method comprises the following steps of: cleaning solution soaking, deionized water soaking, active steeping liquor soaking, and drying to obtain a regenerated catalyst. The technological process of the denitrification catalyst regeneration method is technically characterized by comprising the following steps: (1) preparing a cleaning solution of certain concentration; (2) still steeping the catalyst in a washing pool for 30 to 60 minutes, and transferring the catalyst into a rinsing pool; (3) washing the catalyst with deionized water or a sulfuric acid solution (lower than 1%), and steeping for 30 to 60 minutes; (4) preparing an active steeping liquor of certain concentration, transferring the catalyst into an active steeping pool and steeping for 30 to 60 minutes; (5) and transferring the catalyst into an oven, drying for 1-3 hours at the temperature of 240-320 DEGC, and cooling the catalyst to obtain a regenerated catalyst, wherein the cleaning solution contains one or more of ammonium carbonate, ammonium bicarbonate, ammonium phosphate or ammonium hydrogen phosphate of certain concentration, and the active steeping liquor comprises the following main components: ammonium metavanadate, ammonium paratungstate and oxalate. The denitrification catalyst regeneration method has the characteristics that the washing process adopts chemical process standing operation, so that the loss of effective components in the catalyst can not be caused, and the hardness of the catalyst and the service life of the catalyst can be ensured to the maximum extent.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a method for regenerating an SCR denitrification catalyst, in particular to the catalyst regeneration of an SCR denitrification system for boilers burning high-sulfur and high-calcium coal. Background technique [0002] SCR denitrification technology has become the mainstream technology for power plant denitrification. The most critical component in the SCR denitrification system is the catalyst, which usually accounts for 30% to 50% of the total investment of the denitrification device. As the core part of the SCR technology, the catalyst has a designed operating life of 24,000 hours, but it is often caused by dust and other harmful substances in actual operation. The catalyst loses part of its activity, the NOx at the flue gas outlet does not meet the emission standard, and the ammonia escape exceeds the standard, so the catalyst needs to be replaced. [0003] There are m...

Claims

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Application Information

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IPC IPC(8): B01J38/68B01D53/90B01D53/56
Inventor 宋宝华王中原王俩林德海朱彤王昕竑
Owner CECEP L&T ENVIRONMENTAL TECH
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