Double-treatment cleaning and regenerating method for vanadium-titanium based denitration catalyst

Abstract

The invention discloses a double-treatment cleaning and regenerating method for a vanadium-titanium based denitration catalyst and aims to solve the technical problem that the regenerating effect of the traditional vanadium-titanium based denitration catalyst is not so good. According to the technical scheme, the double-treatment cleaning and regenerating method comprises the following steps of: introducing air-ozone mixed gas into a catalyst regenerating reactor, and carrying out oxidation treatment to obtain a regenerated vanadium-titanium based denitration catalyst; then, placing the regenerated vanadium-titanium based denitration catalyst into a catalyst activity liquid, dipping the regenerated vanadium-titanium based denitration catalyst for 4-6h, then, taking out the regenerated vanadium-titanium based denitration catalyst, drying the regenerated vanadium-titanium based denitration catalyst in dry air at 50-60 DEG C for 1-3h, and then, repeating the operation once; and then, roasting the regenerated vanadium-titanium based denitration catalyst at the temperature of 160-200 DEG C for 1-3h, and then, roasting the regenerated vanadium-titanium based denitration catalyst at the temperature of 300-400 DEG C for 1-3h to obtain the cleaned and regenerated vanadium-titanium based denitration catalyst. The double-treatment cleaning and regenerating method has the beneficial effects that the denitration ratio of the regenerated vanadium-titanium based denitration catalyst can be up to 87%, so that efficient regeneration is realized, meanwhile, the conversion ratio of SO2 / SO3 is effectively reduced, and the denitration cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of denitration catalysts, and relates to a regeneration method of a denitration catalyst, in particular to a dual-treatment cleaning regeneration method of a vanadium-titanium-based denitration catalyst. Background technique [0002] Nitrogen oxide control is an important aspect of air pollution control technology. SCR (Selective Catalytic Reduction) 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 whole SCR denitrification system, the catalyst is the core component, V 2 o 5 -WO 3 / TIO 2 It is a mainstream flue gas denitrification catalyst with a relatively large amount. However, it was found during use that due to the generally high content of fly ash in the flue gas of coal-fired power plants, after the flue gas enters the SCR reactor, the Different degrees of carbon deposits will be fo...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that the regeneration effect of the existing vanadium-titanium-based denitrification catalyst is not very good. High-efficiency regeneration of the vanadium-titanium-based denitration catalyst, the denitration rate of the regenerated vanadium-titanium-based denitration catalyst can reach 87%, and at the same time effectively reduce the SO 2 / SO 3 conversion rate, greatly saving the cost of denitrification

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