A deactivated scr denitrification catalyst regeneration liquid and a regeneration method of deactivated scr denitrification catalyst

Abstract

The invention provides a regeneration liquid of an inactive SCR (Selective Catalytic Reduction) denitration catalyst. The regeneration liquid comprises a washing liquid, a pore diameter restoration liquid and an active component replenishing liquid, wherein the washing liquid comprises vitriol and lauryl sodium sulfate; the pore diameter restoration liquid comprises a pore diameter restoration agent and a dispersant; the pore diameter restoration agent comprises arbitrary one or multiple components in ethyl alcohol, urea, ammonium carbonate and ammonium bicarbonate; the dispersant is polyethylene glycol; the active component replenishing liquid comprises ammonium metavanadate, ammonium tungstate, a PH regulating agent and an additive; the additive comprises lauryl sodium sulfate and polyethylene glycol; the PH regulating agent is arbitrary one or more of oxalic acid and ammonium hydroxide. The regeneration liquid of the inactive SCR denitration catalyst provided by the invention is capable of simultaneously washing, recovering the pore diameter and replenishing the active components of the SCR denitration catalyst; after the catalyst is subjected to the processing of the regeneration liquid, the pore diameter structure of the catalyst is effectively improved and the catalytic activity is recovered to 90% and above of that before inactivation.

Description

technical field [0001] The invention relates to the technical field of flue gas selective catalytic reduction and denitrification, in particular to a deactivated SCR denitrification catalyst regeneration solution and a deactivated SCR denitration catalyst regeneration method. Background technique [0002] In recent years, with the excessive exploitation and consumption of fuel resources such as coal, the emission of nitrogen oxides (NOx) has increased significantly, and the emission control standards for NOx have become increasingly stringent. This requires denitrification and purification of the emitted NOx. At present, selective catalytic reduction (SCR) technology is the most widely used denitrification technology, and the catalyst is the core of SCR flue gas denitrification technology. Commercial catalysts widely used in SCR technology are currently mainly is V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 catalyst. [0003] In my country, the SCR denitrification device is mainly ins...

AI Technical Summary

Problems solved by technology

[0004] In Chinese patent CN 101574671A, surfactant OP~10 is used as one of the components of the regeneration solution to regenerate the deactivated catalyst. However, as the main component of OP~10, alkylphenol polyoxyethylene ether is an environmental hormone and has been Prohibited in some industries

Both Chinese patents CN 102059156A and CN 102974405 relate to the preparation and regeneration method of the regeneration solution of the deactivated catalyst, and the regeneration solution includes cleaning components and active supplementary components, however, the active supplementary components only contain V 2 o 5 and WO 3 Precursor liquid without other additives, it is difficult to ensure sufficient and uniform loading of active components

Chinese patent CN 103418446A discloses a double-pore agent used in the regeneration process of SCR denitration catalyst and its preparation method. However, the composition is various, and an OP emulsifier containing environmental hormones is also used, and the activity of the catalyst before and after regeneration is not checked. Evaluation