An application method of a device for producing high-concentration SO2 gas using magnesium desulfurization products

Abstract

The invention discloses a device and method for producing high-concentration SO2 gas by using a magnesium-process desulfurization product. The wet-process magnesium oxide flue gas desulfurization product and sulfur are used as raw materials, the relative proportion of sulfur steam and air in reactors is controlled, and oxidizing and reducing atmospheres are respectively maintained in two reactors. The desulfurization product is subjected to continuous sulfur fixation reaction and desulfurization reaction in the two reactors, and is continuously circularly operated in a whole system. The desulfurization product particles play a heat carrier role when circulating in the two reactors, the heat is transferred between the reactors, autothermal operation is performed due to the regeneration of a magnesium oxide desulfurization agent, and distinct characteristics of energy saving and emission reduction are achieved. At the same time, externally addition of an air separation device is not required, the regeneration process of the desulfurizing agent can also be associated with raw gas containing the high-concentration SO2 gas. The device and method have the advantages of environmental friendliness, energy saving, consumption reduction and investment saving, and have quite broad application prospects.

Description

technical field [0001] The invention belongs to the field of energy and chemical industry, and specifically relates to a method for producing high-concentration SO2 using magnesium desulfurization products. 2 Gas device application method. Background technique [0002] In recent years, there has been a large-scale outbreak of smog weather in my country, which has reached an unprecedented level in the scope and degree of influence. The smog weather not only seriously affects the health of the people, but also leads to an increase in the probability of illness and the loss of elite talents. The sudden increase in environmental protection pressure has also had a severe impact on my country's economic growth environment. Development poses huge obstacles. Severe weather conditions can even cause serious social problems if the response measures are inappropriate. [0003] Sulfur dioxide is regarded as one of the main gas pollutants emitted by power generation, petrochemical and ...

AI Technical Summary

Problems solved by technology

However, judging from the operation of this method in my country in the past 30 years, it has the following problems: ① The desulfurization by-product desulfurization gypsum is of unstable quality and cannot be effectively used, so it is piled up in large quantities; ② The products formed during desulfurization are easily supersaturated and crystallized in the slurry , causing scaling and corrosion of equipment; ③ Excessive limestone mining has destroyed the balance of natural mineral resources, and there is a serious shortage of high-grade limestone resources. The content of calcium carbonate in limestone purchased by some factories is less than 85%.

Its disadvantage is that in actual operation, there are 20-30% MgSO in the magnesium desulfurization product 4 , but the present invention cannot combine these MgSO 4 Regeneration to MgO wastes a large part of magnesium resources; MgSO 3 Boiling and calcining with sulfur directly under air conditions, it is easy to be oxidized by O 2 Oxidized to MgSO 4 with SO 2 , so that MgSO 3 The thermal decomposition rate is low, and the desulfurization products cannot be regenerated; the entire system needs to obtain electric energy from the outside to achieve a calcination temperature of 500-1000 ° C, and the system cannot operate by self-heating

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