Ozone and urea integrated desulfurization and denitrification device and desulfurization and denitrification method

Abstract

The invention discloses an ozone and urea integrated desulfurization and denitrification device and a desulfurization and denitrification method. Cost of current ozone denitrification is high and secondary pollution is easily caused. The ozone and urea integrated desulfurization and denitrification device comprises a smoke conveying pipe, a urea storage tank, an air pre-heater, an electrostatic deduster, an ozone jet device, an ozone generator, a desulfurization and denitrification tower, a slurry storage tank, a circulating pump and a tail smoke channel. A tower body is internally provided with a spraying area and a depositing area. The depositing area is positioned below the spraying area. The bottom of the spraying area in the tower body is provided with an oxygen inlet and a circulating outlet, the middle is provided with a smoke inlet, and the top is provided with a sprayer. The circulating outlet of the denitrification tower is connected with a circulating liquid inlet of the slurry storage tank. A liquid inlet of the sprayer is connected with a liquid outlet of the slurry storage tank through the circulating pump. The ozone and urea integrated desulfurization and denitrification device provided by the invention is less in ozone additive amount, and capable of enabling ozone to be reacted completely, and preventing the residual ozone from causing the secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of coal-fired flue gas treatment, and in particular relates to an ozone-combined urea integrated desulfurization and denitrification device and a desulfurization and denitrification method thereof. Background technique [0002] With the rapid development of my country's economy and the steady improvement of people's living standards, my country's energy and electricity consumption and demand are increasing year by year. Due to the characteristics of China's energy resources rich in coal, poor in oil and little in gas, the supply of electricity in my country is mainly coal-fired thermal power generation, and in the process of coal combustion, smoke and dust, sulfur dioxide (SO 2 ), nitrogen oxides (NO x ), carbon oxides (CO / CO 2 ), toxic heavy metals such as mercury (Hg), and pollutants such as volatile organic compounds (VOCs). Coal-burning pollutants have caused extremely serious pollution and damage to ...

AI Technical Summary

Problems solved by technology

SCR technology has high denitrification efficiency and stable operation. The existing problems are secondary pollution caused by catalyst deactivation and leakage of reducing substances (such as ammonia water, etc.). Problems such as wear, clogging, operation and investment costs are very expensive

However, due to the very short survival time of free radicals, it is necessary to combine the generation of free radicals with the flue gas reactor to discharge the entire flue, and the boiler flue gas contains a large amount of N 2 , CO 2 、H 2 O, dust and other substances, the discharge conditions are bad, and N 2 , CO 2 Consumes a lot of input energy, resulting in low energy utilization rate and high overall operating costs. In addition, the desulfurization and denitrification products are mixtures of sulfur and nitrogen, which are not easy to separate and have low value.

In addition, there is also a method of ozone denitrification, but in the existing ozone denitrification, it is necessary to make an excessive amount of ozone to ensure the denitrification effect

The use of a large amount of ozone will greatly increase the cost of denitrification, and the reaction of excessive ozone will easily produce secondary pollutants

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