Flue gas comprehensive denitration treatment system and treatment technology

Abstract

The invention discloses a comprehensive treatment system for flue gas, which comprises: an SNCR reactor, an SCR reactor, a dust remover and a desulfurization tower connected in sequence, wherein an oxidation treatment is also arranged between the dust remover and the desulfurization tower The oxidation treatment unit includes an oxidant tank storing oxidant, and an oxidation spray gun connected to the oxidant tank, which is arranged in the flue between the dust remover and the desulfurization tower. The treatment steps of the treatment system include: a. reducing the flue gas with a reducing agent; b. removing nitrogen oxides in the flue gas under the action of a catalyst, and entering the dust collector to remove particulate pollutants in the flue gas ; c, oxidizing and dissolving the water-insoluble pollutants in the flue gas under the action of an oxidizing agent; d, performing desulfurization treatment on the flue gas. The treatment system and process of the present invention can improve the boiler load adaptability of the denitrification reaction, can perform denitrification from the ignition stage to full load, and realize denitrification in all working conditions.

Description

technical field [0001] The invention relates to a treatment system for boiler flue gas, in particular to a comprehensive denitration treatment system for treating boiler flue gas by combining SNCR, SCR and oxidation denitrification (Selective Oxidation / Neutralization Reaction, SONR process). In addition, the present invention also relates to a comprehensive flue gas denitration treatment process (ALLINONE, AIO process), which belongs to the field of air pollution control. Background technique [0002] During the combustion of coal, a large amount of sulfur oxides, nitrogen oxides, dust and heavy metals will be produced. Among them, some of the pollutants come from the components of the fuel itself, while most of the pollutants are produced during the combustion process. The generation of these flue gas pollutants will cause great damage to the environment. The current domestic nitrogen oxide emission standard is 200mg / m 3 up to 100mg / m 3 , 50mg / m in key areas 3 . [00...

AI Technical Summary

Problems solved by technology

However, the above-mentioned treatment technologies have different degrees of secondary pollution problems and technical shortcomings

For example, in the existing SCR technology, the operating temperature of the catalyst is 300°C-400°C, which cannot meet the temperature requirements when the boiler is started and the load is low.

However, the existing SNCR technology has an operating temperature as high as 850°C-1150°C, similar to the SCR technology, which cannot meet the temperature requirements when the boiler is started and under low load, resulting in the inability to achieve timely and effective treatment of flue gas

In addition, as environmental laws and regulations put forward stricter requirements on the control of pollutants, it is difficult for the flue gas treated by the above-mentioned single treatment technology to meet today's more stringent emission requirements.

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