Zero discharge system for treating flue gas of boiler and method

Abstract

The invention discloses a zero discharge system for treating a flue gas of a boiler and a method. The zero discharge system comprises a boiler, an oxidation reactor and a desulfurizing tower, wherein the boiler is used for generating a flue gas; the oxidation reactor and the desulfurizing tower are sequentially connected with the boiler through a pipeline; the oxidation reactor is also connected with an ozone preparation and distribution unit; the ozone preparation and distribution unit comprises an ozone generator and at least two spray guns; the spray guns are connected with the ozone generator, and extend into the oxidation reactor; and furthermore, the ozone injection quantity in various spray guns and the positions of the various spray guns in the oxidation reactor can be adjusted by the system according to the concentration of nitric oxide and sulfur oxide in the flue gas in the oxidation reactor within the injection ranges of the spray guns. According to the zero discharge system and the method, the quantity and the distribution positions of the spray guns, and the ozone injection quantity in the spray guns can be adjusted according to the concentration differences of flue gas pollutants in various reaction regions in the flue; adjustable control on the ozone quantity within each reaction region is realized; the oxidation reaction efficiency is improved; and the treatment cost is reduced.

Description

technical field [0001] The invention relates to a flue gas treatment system and method, in particular to a zero-emission treatment system and method for denitrification, desulfurization, dust removal and mercury removal suitable for the treatment of boiler flue gas, belonging 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. During the "Twelfth Five-Year Plan" period, the state strengthened the control of coal-fired boilers, which made the emission of flue gas pollutants controlled to a certain extent. [0003] At present, the main flue gas treatment technologies in the industry include: 1) The tech...

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Problems solved by technology

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

For example, desulfurization technology has high water consumption, and it will cause secondary pollution such as sewage and dust while desulfurization; SCR technology requires the use of a large number of catalysts. With the strict environmental protection indicators, the catalyst needs to be further filled, and the subsequent Catalyst maintenance and regeneration will again cause secondary pollution such as sewage and dust

With the improvement of link requirements, environmental protection regulations put forward stricter requirements on the control of pollutants, and it is difficult for the above-mentioned treatment technologies to achieve stricter emission requirements.

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