Device for removing sulfur dioxide in flue gas

Abstract

The invention relates to a device for removing sulfur dioxide in flue gas, which comprises a desulfurizing tower (1) as well as an ammonium sulfite-oxidizing unit (6), a defogging mechanism, a purified gas-exhausting outlet (13) and a desulfurizing unit which are arranged at the lower part of the cavity of the desulfurizing tower (1). The device is characterized in that the cavity of the desulfurizing tower (1) is divided into a front cavity (14) and a back cavity(15) in the vertical direction by a barrier (8), the front cavity (14) is provided with a concentration region (A) of a concentration unit and a desulfurizing region (B), and an absorption liquid atomizing unit (5) is arranged in the flue gas inlet (12) of the desulfurizing tower (1). Compared with the prior art, the invention has the advantages of simple process flow and low equipment investment. By arranging the absorption liquid atomizing unit at the flue gas inlet, the device can firstly remove part of SO2, can concentrate sulphate solution by using the heat of flue gas containing sulfur dioxide and can eliminate damages to equipment caused by subsidiary reactions due to high temperature in the flue gas containing sulfur dioxide. By using the device, the removal rates of harmful gas components in waste gas are as follows: no less than 95% for SO2, no less than 99% for SO3, 10-30% for NOx, and no less than 99% for HF; and the dust removal rate is no less than 90%.

Description

technical field [0001] The invention relates to the technical field of a device for removing sulfur dioxide in flue gas and producing ammonium sulfate by-product. Background technique [0002] Usually, SO is contained in exhaust gas from mining industry, sulfuric acid industry, or coal-fired and oil-fired boilers. 2 gas. Even trace amounts of SO 2 Due to the huge amount of emissions, it will also cause serious damage to the environment and ecology. According to reports, my country has become the most severely affected area by acid rain after the Americas and Europe, and large tracts of forests and land have been destroyed. my country has clearly required that new power plants must be equipped with exhaust gas desulfurization devices, and that existing power plants with excessive emissions must install desulfurization facilities before the end of 2010. Those that have been in operation for more than 20 years or have an installed capacity of less than 100,000 kilowatts will...

AI Technical Summary

Problems solved by technology

There are also some technologies that treat ammonium sulfite as a by-product through the post-processing section, and some have an oxidation section inside or outside the tower to oxidize ammonium sulfite into ammonium sulfate, and ammonium sulfate is used as a by-product. The disadvantage of this design is that the process is more complicated and the equipment Large investment, many installation projects, and can not make good use of the heat in sulfur dioxide flue gas to improve energy utilization, so its structure needs to be improved

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