Desulfurization and denitration technology and system by ozone oxidation double-tower ammonia method

Abstract

The invention relates to a desulfurization and denitration system by an ozone oxidation double-tower ammonia method. The desulfurization and denitration system sequentially comprises a hydrogen peroxide spraying device, a draught fan, an ozone spraying device, a flue gas mixing device, a front adsorption tower, a rear adsorption tower, a cyclone separator, a centrifugal separator and a drier, wherein the hydrogen peroxide spraying device is arranged at an outlet of a boiler coal economizer, the outlet of the boiler coal economizer is connected to the draught fan through an air preheater and a dust remover and is connected to the front adsorption tower; the ozone spraying device is mounted in front of an inlet flue of the front adsorption tower; and the flue gas mixing device is arranged between the ozone spraying device and the inlet flue of the front adsorption tower. The desulfurization and denitration system disclosed by the invention has the beneficial effects that the integration degree of a technology is high, the desulfurization and the denitration are integrated, the double-tower structure are stable in properties, the desulfurization efficiency and the denitration efficiency are high, the source of an adsorption tower machine is reliable, the added value of by-products is high, little secondary pollution exists, and the operation cost is low.

Description

technical field [0001] The invention relates to a desulfurization and denitration process and a system thereof, in particular to an ozone oxidation double-tower ammonia desulfurization and denitrification process and a system thereof. Background technique [0002] Sulfur dioxide (SO 2 ) and nitrogen oxides (NOx) are recognized worldwide as one of the air pollutants, and are another major cause of acid rain, photochemical smog, and impact on the ecological environment. With the development of my country's electric power industry, SO 2 The emissions of NOx and NOx are increasing year by year, which has aroused great attention both at home and abroad. Controlling both emissions has become the focus of energy conservation and emission reduction. [0003] For flue gas desulfurization technology, the limestone-gypsum wet desulfurization process is the most widely used. Although the desulfurization efficiency of this method is high, the by-product gypsum is very easy to harden, ...

AI Technical Summary

Problems solved by technology

Although the SCR method can achieve high denitrification efficiency, it needs to install expensive catalysts to complete the denitrification, and has strict requirements on the temperature range of the denitrification reaction. When the flue gas temperature exceeds this temperature range, the denitrification cannot be achieved.

At the same time, the process will also produce more SO 3 and ammonia escape, the sulfate generated by the two will block the air preheater and corrode the downstream equipment; in addition, the SCR method also has the disadvantages of occupying a large area and high energy consumption.

Discarded denitrification catalysts are dangerous solid wastes, which are difficult to deal with at present, and are likely to cause secondary pollution to the soil, resulting in high environmental risks.

[0005] The above two desulfurization and denitrification processes are independent of each other and can only remove one pollutant. 2 When both NOx and NOx control requirements are put forward, two systems need to be installed at the same time, which makes the investment of desulfurization and denitrification equipment become huge, the area is larger, and the operating cost is also higher. complex

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