Flue gas denitrification catalyst on-line regeneration cleaning liquid and preparation method thereof

Abstract

The invention discloses a flue gas denitrification catalyst on-line regeneration cleaning liquid and a preparation method thereof. The flue gas denitrification catalyst on-line regeneration cleaning liquid comprises 1 to 10wt% of an acid, 0.1 to 2wt% of a penetrant and / or a surfactant, and the balance deionized water. The flue gas denitrification catalyst on-line regeneration cleaning liquid avoids the adverse influence produced by harmful substances on an activation process, can effectively recover porosity and a specific surface area of a spent catalyst, can further improve catalytic activity by combination with a regeneration activator liquid, can be used for flue gas denitrification catalyst on-line regeneration, and has low regeneration activator medium consumption, a low regeneration cost and short regeneration period. Only through the flue gas denitrification catalyst on-line regeneration cleaning liquid, the whole activity of a catalyst is recovered by above 60%.

Description

technical field [0001] The invention relates to the field of chemical industry, and more particularly relates to an on-line regeneration cleaning liquid for a flue gas denitrification catalyst and a preparation method thereof. Background technique [0002] The country has promulgated a more stringent emission standard for thermal power plants, GB13223-2011, which will be implemented from January 1, 2012. Among them, higher standards are set for the emission of nitrogen oxides in the air pollutants of thermal power plants. Therefore, starting from 2012, it is imperative to start the national denitrification market. [0003] The selective catalytic reduction method (SCR method for short) is the most commonly used method for flue gas denitrification of thermal power plant boilers and other power boilers at home and abroad (accounting for about 90% of the total). The process of arranging multi-layer catalysts in the flue is used for denitrification. The catalyst accounts for a...

AI Technical Summary

Problems solved by technology

[0007] The first category is that the surface or pores of the catalyst are covered with ash, ammonium bisulfate NH 4 HSO 4 , calcium sulfate CaSO 4 Covered and blocked by etc., hinder the reducing agent in the flue gas (ammonia NH 3 ) and the contact of nitrogen oxide gas with the active component vanadium pentoxide in the solid catalyst, which is equivalent to the reduction of the specific surface area of ​​the catalyst

[0008] The second type is that the active group of the catalyst active component vanadium pentoxide on the catalyst surface or in the pores is occupied by alkali metals (Na and K), alkaline earth metals (Ca and Ma), arsenic As, carbon deposits, etc. in the flue gas, reducing overall activity of the catalyst

[0009] The third type is vanadium pentoxide and MoO on the surface or pores of the catalyst 3 or WO 3 Partial loss due to various reasons reduces the overall activity of the catalyst

[0010] The fourth category is that the catalyst is agglomerated due to lattice modification caused by overheating and loses its activity

Its shortcomings are: 1. The catalyst module is removed from the flue before regeneration and hoisted to the ground. After regeneration, it is hoisted into the flue and then installed and restored. The amount of work is huge; 2. Due to the limited capacity of the regeneration device, only A single module is regenerated one by one. Each module needs to be hoisted in and out of multiple regeneration devices to complete the entire regeneration process. The process switching of each module requires a lot of cumbersome valve operations; 3. The strength of the catalyst is limited, and it is easily broken after frequent handling, resulting in The flue gas resistance is too high or even unable to run; 4. The regeneration formula is selected for the offline regeneration method, and the regeneration medicine consumption is large, and the regeneration cost is high; 5. The entire regeneration period is long, which cannot meet the requirements of timely commissioning of the boiler

It is a composite regeneration solution that performs cleaning and activation at the same time. It does not consider the different purposes of cleaning and activation, and does not consider the adverse effects of harmful substances cleaned on the activation process.

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