Method for treating waste gas by using ion exchange resin

Abstract

The invention relates to a method for treating waste gas by using ion exchange resin, wherein the method comprises the steps of pretreating flue gas, oxidizing resin, desulfurizing and denitrifying, and recycling an oxidizing agent solution; common ion exchange resin is converted into a form with an oxidizing group by using an oxidizing agent, and the common ion exchange resin has the ion exchange function and the strong oxidizing property; through the intermittent regenerant spraying manner, the non-shutdown and non-production-shutdown can be achieved, the oxidation, the exchange and the partial regeneration of the exchange resin can be simultaneously achieved, and the efficient desulfurization and denitrification performance can be provided.

Description

technical field [0001] The application relates to the technical field of flue gas desulfurization and denitrification, and relates to a method for treating waste gas with ion exchange resins, in particular to a method for ion exchange resins to purify flue gas, desulfurize and denitrate while partially regenerating them. Background technique [0002] Industrial flue gas refers to the flue gas and dust produced by the combustion of industrial boilers. The main pollution factor in industrial boiler flue gas: sulfur dioxide (SO 2 ), nitrogen oxides (NO x ) and particulate matter, etc., are one of the main factors affecting the atmospheric environment. SO in flue gas 2 , NO x The main problems in the industry are the effective control of sulfur dioxide and nitrogen oxides in industrial flue gas. [0003] At present, most small coal-fired boilers adopt simple wet desulfurization and dust removal integrated technology, with dust removal efficiency of about 90%, desulfurization...

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Problems solved by technology

[0003] At present, most of the small coal-fired boilers adopt the integrated technology of simple wet desulfurization and dust removal. The dust removal efficiency is about 90%, the desulfurization efficiency is about 50% (all use low-sulfur fuel), and the denitrification efficiency is less than 10%.

The dust removal efficiency of the bag filter is high, up to 99.8%; the desulfurization device automatically adds desulfurizer, and the desulfurization efficiency reaches over 90%; the denitration efficiency of the SCR denitrification device is over 50%, but due to the problem of the temperature window of the catalyst, it cannot be guaranteed higher operating rate

[0004] Another problem is the ion exchange resin regeneration process. After the ion exchange resin has been used for a period of time, the adsorbed impurities are close to saturation, and regeneration treatment is required. At present, the commonly used method is to use chemicals to remove the ions and other impurities adsorbed by the resin. Eluted and removed to restore its original composition and performance

However, during the regeneration process, it is necessary to stop production and elute the ion exchange resin separately for regeneration. The construction period is long, and one backup and one use are required.

At the same time, in the entire desulfurization and denitrification process, the entire process needs to be shut down, and the ion exchange resin is eluted and regenerated with chemical reagents alone. Production safety, reduction of process progress, resulting in varying degrees of economic losses and negative impacts on environmental protection

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