Magnetic separation device and method for sulfur dioxide in flue gas

Abstract

The invention discloses a magnetic separation device for sulfur dioxide in smoke. The magnetic separation device comprises a smoke washing cooling tower and a plurality of sets of magnetic desulfurization device units, wherein each set of the magnetic desulfurization device unit comprises a pressurizing pump, an agitating machine, a magnetic separation pipe and a centrifugal machine which are connected in sequence; the magnetic desulfurization device units are divided into various separation grades and various concentration grades. Smoke including oxysulfide or other industrial waste gas is discharged into the smoke washing cooling tower to be washed to cool the washing water to 48-52 DEG C; the washing water passes through the pressurizing pumps and the agitating machines and enters the magnetic separation pipes; under the diffusion effect of opposite magnetic fields of the magnetic separation pipes, sulfuric acid and the water are separated to be close to pipe walls of the magnetic separation pipes, are enriched and then enter the centrifugal machines. Low-concentration industrial sulfuric acid is obtained by a plurality of grades of separation and concentration. The magnetic separation device has the good desulfurization effect; the whole technological process does not use a desulfurization agent; phenomena of scaling, blocking, corroding, abrading equipment and the like do not occur, and the emission and pollution problems of desulfurization byproducts are avoided; meanwhile, the emission amount of CO2 is not increased.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a device and method for separating sulfur oxides such as sulfur dioxide in flue gas or other industrial waste gases. Background technique [0002] Sulfur dioxide and other sulfur oxides in combustion exhaust gas or other industrial waste gas are the most important factors for the formation of acid rain, and acid rain has seriously endangered buildings, soil and human living environment; This process is referred to as flue gas desulfurization; currently there are dozens of flue gas desulfurization technologies, but the most mature one is the wet flue gas desulfurization process, the form and mechanism are similar, mainly using limestone (CaCO 3 ), lime (CaO) or sodium carbonate (Na 2 CO 3 ) and other slurries are used as desulfurizers, and the flue gas is washed in the reaction tower to remove SO in the flue gas 2 ; This process has a history of 50 years. After...

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Problems solved by technology

[0002] Sulfur dioxide and other sulfur oxides in combustion exhaust gas or other industrial waste gas are the most important factors for the formation of acid rain, and acid rain has seriously endangered buildings, soil and human living environment; This process is referred to as flue gas desulfurization; currently there are dozens of flue gas desulfurization technologies, but the most mature one is the wet flue gas desulfurization process, the form and mechanism are similar, mainly using limestone (CaCO 3 ), lime (CaO) or sodium carbonate (Na 2 CO 3 ) and other slurries are used as desulfurizers, and the flue gas is washed in the reaction tower to remove SO in the flue gas 2 ; This process has a history of 50 years. After continuous improvement and perfection, the technology is relatively mature, with high desulfurization efficiency (90% to 98%), large unit capacity, strong adaptability to coal types, low operating costs and The by-products are easy to recycle and other advantages; more than 90% of the large thermal power plants in the world (such as China, the United States, Germany, Japan, etc.) adopt the wet lime / limestone-gypsum flue gas desulfurization process, but the lime / limestone process has its potential Defects, mainly manifested as fouling, blockage, corrosion and wear of equipment, and increased CO 2 Emissions, desulfurization by-products - desulfurization gypsum needs to be comprehensively utilized, otherwise it will pollute the environment; therefore, it is necessary to innovate the existing flue gas desulfurization technology to provide efficient separation of flue gas or other Process and device for sulfur oxides such as sulfur dioxide in industrial waste gas

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