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Method and device for regenerating desulfurizing agents and sulfur serving as by-product in magnesium desulfurization

The technology of magnesium-based desulfurization and desulfurization agent is applied in the field of desulfurization agent regeneration and sulfur by-product in magnesium-based desulfurization.

Pending Publication Date: 2019-01-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SO generated after calcination 2 It is used to prepare sulfuric acid. However, sulfuric acid cannot be used in coal-fired power plants. If there are no acid-consuming enterprises nearby, it is difficult to store and transport the produced sulfuric acid.

Method used

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  • Method and device for regenerating desulfurizing agents and sulfur serving as by-product in magnesium desulfurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A device for regenerating desulfurizing agent and producing sulfur by-product in magnesium desulfurization, comprising a magnesium sulfite storage bin 1, a fluidized bed calcination unit, a fluidized bed carbothermal reduction unit and a sulfur recovery unit, the fluidized bed calcination unit includes Fluidized bed calciner 3, calciner high-temperature separator 4 and incinerator 2, magnesium sulfite storage bin 1 is connected with the lower part of fluidized bed calciner 3, the bottom of fluidized bed calciner 3 is connected with incinerator 2, fluidized The top decomposition gas outlet of the bed calciner 3 is connected to the calciner high temperature separator 4, and the fluidized bed carbothermal reduction unit includes a fluidized bed carbothermal reduction tower 6 and a reduction tower high temperature separator 7, and the top of the calciner high temperature separator 7 is The demagnesium removal decomposition gas outlet is connected to the bottom of the fluidiz...

Embodiment 2

[0056] Utilize the device of embodiment 1 to carry out the method for desulfurizing agent regeneration while by-product sulfur, concrete steps are:

[0057] 1) Magnesium sulfite, a by-product of desulfurization, enters the fluidized bed calciner 3 for fluidized calcination, and the magnesium sulfite is heated to 750°C in the flue gas of the incinerator 2 for pyrolysis, and the decomposition gas is separated by the high temperature separator 4 of the calciner The obtained MgO is cooled in the air preheater to 520°C and returned to the desulfurization system for recycling, and the obtained demagnesium decomposition gas enters the fluidized bed carbothermal reduction tower 6 at 750°C, and the demagnesium decomposition gas is N 2 , SO 2 , CO 2 、H 2 O, O 2 etc. mixed gas;

[0058] 2) Demagnesium decomposed gas and carbon powder undergo a fluidized reaction in the fluidized bed carbothermal reduction tower 6, the reaction time is 4s, the reaction temperature is 850°C, and C / SO ...

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Abstract

The invention belongs to the field of industrial waste treatment, and relates to a method and a device for regenerating desulfurizing agents and sulfur serving as a by-product in magnesium desulfurization. The device comprises a magnesium sulfite storage bin, a fluidized bed calcining unit, a fluidized bed carbon thermal reduction unit and a sulfur recovery unit, the fluidized bed calcining unit comprises a fluidized bed calcining furnace, a calcining furnace high-temperature separator and an incinerator, the magnesium sulfite storage bin is connected with the lower portion of the fluidized bed calcining furnace, the bottom of the fluidized bed calcining furnace is connected with the incinerator, a top decomposition gas outlet of the fluidized bed calcining furnace is connected with the calcining furnace high-temperature separator, the fluidized bed carbon thermal reduction unit comprises a fluidized bed carbon thermal reduction tower and a reduction tower high-temperature separator, atop magnesium removal decomposition gas outlet of the calcining furnace high-temperature separator is connected with the bottom of the fluidized bed carbon thermal reduction tower, a top reduction gas outlet of the fluidized bed carbon thermal reduction tower is connected with the reduction tower high-temperature separator, and the reduction tower high-temperature separator is connected with themagnesium sulfite storage bin. Magnesium sulfite decomposition rate is higher than 99%, and the purity of recovered sulfur reaches 99.7% or more.

Description

technical field [0001] The invention belongs to the field of industrial waste treatment, and in particular relates to a method and a device for regenerating a desulfurizing agent and simultaneously producing sulfur by-product in magnesium desulfurization. Background technique [0002] Magnesium oxide desulfurization technology is a desulfurization process second only to the calcium method in maturity and is widely used. The by-product of magnesium desulfurization is magnesium sulfite. At present, the main methods of recycling the by-product are oxidation into magnesium sulfate and calcination into magnesium oxide for recycling. The calcination method is an ideal method. Through the recycling of the desulfurizer, the mining of magnesium oxide can be reduced and the damage to the natural environment can be reduced. SO generated after calcination 2 It is used to prepare sulfuric acid. However, sulfuric acid cannot be used in coal-fired power plants. If there are no acid-consu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/06C01B17/04B01D53/96B01D53/50B01D53/80
CPCB01D53/502B01D53/96C01B17/0482C01F5/06B01D2251/402B01D2251/604B01D2251/602
Inventor 马春元冯太赵希强李军夏霄张世珍
Owner SHANDONG UNIV
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