Device and method for removing sulfur dioxide in waste gas

Abstract

The invention belongs to the field of waste gas desulfurization, and particularly relates to a device and a method for removing sulfur dioxide contained in a waste gas. The device and the method can be used for solving the problems of the traditional waste gas desulfurization technology. The device for removing the sulfur dioxide contained in the waste gas comprises an inverse shearing rotation packed bed, a barren solution storage tank, a pregnant solution storage tank, a barren solution circulation pump and a pregnant solution circulation pump, wherein an inverse rotation packed bed absorber is in a parallel flow structure; a gas and a liquid which are positioned in the inverse shearing rotation packed bed contact in a parallel flow way. The method for removing the sulfur dioxide contained in the waste gas comprises the following step: fast transferring SO2 contained in the waste gas to a desulfurization absorbing agent by carrying out multistage parallel flow contact on the desulfurization absorbing agent and the SO2-containing waste gas through multilayer inverse rotation packings and body resistance parts. The device disclosed by the invention has the advantages of small size, width treatment tolerance range, simple structure and easiness for operation. Compared with the traditional tower, the process disclosed by the invention has the advantages of high desulfurization rate, less gas-phase pressure drop, low energy consumption, low investment and operation cost, stability in operation, convenience for start and stop, and the like.

Description

technical field [0001] The invention belongs to the field of exhaust gas desulfurization, and in particular relates to a device and method for continuously removing sulfur dioxide from exhaust gas by using ionic liquid as a desulfurizer, using a reverse shearing rotary packed bed and a rotary packed bed as an absorption reactor and a desorption reactor respectively . Background technique [0002] With the rapid development of my country's economy, the impact of industrial waste gas on the environment is becoming more and more serious, among which SO 2 Is one of the most important industrial waste gas, SO in 2008-2009 2 Emissions have accounted for more than 60% of the total industrial waste gas emissions, and the control of SO 2 Emissions become the key to reducing industrial waste gas emissions. SO in industrial waste gas 2 emissions are mainly concentrated in industries such as electricity, heat, metal smelting, non-metallic mineral products, and chemical and chemical ...

AI Technical Summary

Problems solved by technology

In 2012, a new emission standard of air pollutants for thermal power plants was implemented, SO in flue gas 2 The outlet concentration is changed from the previous (400~1200) mg / m 3 Reduced to (50-200) mg / m 3 , which makes it difficult for the existing flue gas desulfurization technology based on wet limestone / lime method to meet emission standards or to operate economically

The desulfurization efficiency is as high as 90%, and the equilibrium time is short, but the mass transfer process has not been strengthened, which limits the further improvement of desulfurization efficiency, and there is a big gap from the industrial application of this desulfurization technology

[0005] Hypergravity technology is a new process intensification technology realized by rotating packed bed (RPB), which uses the centrifugal force generated by the rotating packing to simulate the supergravity environment, so that the liquid flow speed is accelerated and the thickness of the liquid film is thinned, especially for high For viscous liquids, the interphase area and surface renewal rate are greatly increased, and the total mass transfer coefficient is increased by 1 to 3 orders of magnitude. The improvement of mass transfer coefficient and mass transfer coefficient is not obvious, and the structure of the existing rotating packed bed still has defects such as uneven liquid distribution

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