Device and method for magnesium process flue gas desulfurization

Abstract

The invention discloses a device and method for magnesium process flue gas desulfurization. The device comprises a multi-stage cross flow-reverse flow rotating filling bed absorption device, wherein an exhaust pipe is arranged on the top of the rotating filling bed absorption device; a liquid discharge pipe is arranged at the bottom; a liquid inlet pipe is connected with the side surface of the upper side; an air inlet pipe is connected with the side surface of the lower side; a rotating shaft is arranged inside the rotating filling bed absorption device; two filling material rotors or more are arranged on the rotating shaft; a filling material stator is arranged between the two adjacent rotors; a liquid distributor is arranged in the center of the filling material rotor and is connected with the liquid inlet pipe; the lower end of the rotating shaft extends to the outside of an absorption device to be connected with a frequency modulation motor; the gas inlet pipe of the rotating filling bed absorption device is connected with a SO2-containing smoke gas pipeline; a liquid inlet pipe of the rotating filling bed absorption device is connected with a magnesium hydrate storage groove;the liquid discharge pipe is connected with a magnesium bisulfite storage groove. The method has the advantages that a magnesium hydroxide desulfurizer is used for wet process desulfurization; the purification degree, and the speed in the desulfurization process and the desulfurization efficiency are improved; the smoke gas ultra-low discharge standard can be reached by single piece of equipment.

Description

technical field [0001] The invention relates to a device and method for flue gas desulfurization by magnesium method, belonging to the technical field of flue gas desulfurization. Background technique [0002] SO 2 It is the main component of air pollution, and flue gas desulfurization is to control SO 2 main means of emissions. At present, more than 200 flue gas desulfurization technologies have been researched, developed and used in various countries, of which more than 20 have been industrialized, mainly wet desulfurization with the advantages of large processing capacity and high efficiency. Alkaline absorbent absorbs SO in flue gas 2 , such as lime / limestone / gypsum method, ammonia method, double alkali method, etc., but the desulfurization products of these methods have complex components and low utilization rate. If they are separated and reprocessed, a series of post-processing procedures are required, and the investment and cost High, resulting in most of the des...

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Problems solved by technology

However, due to the high viscosity of magnesium hydroxide slurry, it is not easy to effectively disperse in traditional tower equipment, which affects the desulfurization rate and utilization rate; the generated MgSO 3 It is slightly soluble in (0.646g / 100g) water at 25°C, and is prone to problems such as scaling and clogging; and the equipment used in this method is still a traditional tower equipment, which has a large equipment volume and floor space, and an investment and High operating costs limit its promotion and application

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