Acid pickling regenerating liquid for denitration catalyst and regenerating method

Abstract

The invention provides an acid pickling regenerating liquid for a denitration catalyst and a regenerating method. The acid pickling regenerating liquid comprises 0.1-1.0% of a surfactant and the balance being an acid solution, wherein the surfactant comprises one or more of JFC type fatty alcohol-polyoxyethylene ether, JFC-1 type fatty alcohol-polyoxyethylene ether, and JFC-2 type fatty alcohol-polyoxyethylene ether. Compared with the prior art, the acid pickling regenerating liquid has good effect of regenerating the toxic denitration catalyst in metallic elements, and the regenerated denitration catalyst has high denitration efficiency. Experiment results prove that in the regenerated denitration catalyst, the content of the metallic elements causing the denitration catalyst to be toxic is effectively controlled, and the denitration efficiency of the denitration catalyst is above 90%.

Description

technical field [0001] The invention relates to the technical field of catalyst regeneration, and more specifically relates to a pickling regeneration solution and a regeneration method for a denitration catalyst. Background technique [0002] my country is a country with coal as the main energy source, and nitrogen oxides emitted after coal combustion is one of the main pollutants in the atmosphere, which is extremely harmful to the environment. Therefore, my country has strictly controlled the emission of nitrogen oxides. [0003] Selective Catalytic Reduction (hereinafter referred to as SCR) denitrification technology has a remarkable effect on the removal of nitrogen oxides, and is currently the most widely used flue gas denitrification technology. In the entire SCR denitrification system, the denitrification catalyst is the core component and accounts for a relatively large proportion of equipment investment. However, the denitrification performance of the denitrificat...

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Problems solved by technology

In the prior art, the deactivated catalyst is generally cleaned with water or acid solution to remove the alkali metal and alkaline earth metal on the surface of the denitrification catalyst, so as to realize the regeneration of the deactivated denitrification catalyst. However, in actual coal-fired power plants, the chemical Poisoning is not only alkali metal and alkaline earth metal poisoning, but also more complex conditions, such as aluminum poisoning, iron poisoning, etc.

Among them, iron poisoning is more harmful to the denitrification catalyst. The iron compound in the flue gas is deposited on the denitrification catalyst. On the one hand, it will cause SO 3 On the other hand, the iron compound can react with the active components in the denitration catalyst, resulting in a decrease in the activity of the denitration catalyst

In view of the complex metal element poisoning of the denitration catalyst, the deactivated denitration catalyst is regenerated with water or acid solution. The denitration activity of the regenerated denitration catalyst is less than 80%, and the regeneration effect is not ideal.