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Magnesium oxide desulfurization should be broken by breaking industry barriers

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Magnesium oxide desulfurization should be broken by breaking industry barriers

Date:2016-08-31 Author: Click:

  

China has become the largest importer of sulfur, importing 11.93 million tons last year, an increase of 16.53% compared with 2014. Take a 1000MW thermal power plant as an example. 120 tons of sulfur will be discarded every day with desulfurized gypsum.


    After more than 30 years of efforts, the sulfur dioxide emitted by thermal power plants in China has been effectively controlled, and the contribution rate of thermal power plants to atmospheric pollutants has been greatly reduced. However, reviewing the history of desulfurization technology in thermal power plants in China, there is a problem worthy of discussion.


As we all know, the mainstream technology of flue gas desulfurization in thermal power plants in China is limestone gypsum wet method. This technology has high desulfurization efficiency, stable operation, large operation flexibility and wide adaptability. However, it also has some disadvantages: for example, a large amount of CO2 is emitted while desulfurizing. According to estimates, for every 1 ton of SO2 removed, 687.5 kilograms of CO2 will be produced. Secondly, desulfurization of magnesium oxide has not been found to be suitable for use. In some power plants, mountains are piled up, and some are directly discharged into the ash yard for landfill, which increases the burden on the ash yard. Third, the desulfurizer has a large amount of limestone and cannot be recycled, which destroys the natural landscape to some extent.


In fact, there are many desulfurization technology routes, in which the principle of magnesium oxide desulfurization is the same as that of the limestone-gypsum method, and the desulfurization efficiency is high. The process route is: magnesium oxide reacts with SO2 in the flue gas to form MgSO3, and the generated MgSO3 is calcined to produce SO2 and MgO, and the generated SO2 can be used to produce sulfuric acid, and the generated MgO can be recycled and used as a desulfurizing agent.


Since magnesium oxide desulfurization has so many obvious advantages, why is it not promoted in desulfurization in thermal power plants? There are two reasons for this: First, in the process of desulfurization of magnesium oxide, it is necessary to control the oxidation of MgSO3, because once MgSO4 is oxidized, it is impossible to roast to obtain SO2 and MgO; secondly, the power plant needs to have a chemical plant for producing sulfuric acid.


It stands to reason that controlling the oxidation of MgSO3 is not a problem for the chemical industry. The problem is that most of the leading desulfurization technologies in thermal power plants are not chemical technicians, which is a bit difficult for them. Secondly, the problem of SO2 acid production requires the establishment of a chemical plant outside the power plant, which is also a problem for the power industry.


Desulfurized magnesium oxide


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