Denitrification catalyst regeneration method

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...

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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 cleaning will affect the hardness of the catalyst. The damage is relatively large, and it is easy to cause the catalyst to break and crack

201010598331.1 and 201110203212.6 adopt the ultrasonic method to clean the catalyst, which will encounter problems such as insufficient ultrasonic power and poor penetration in industrial applications

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