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System for desulfurization and magnesium sulfate heptahydrate co-production by using magnesium oxide

A technology of magnesium sulfate heptahydrate and magnesium oxide, applied in magnesium sulfate, chemical instruments and methods, gas treatment, etc., can solve the problems of desulfurization gypsum purity, compressive tensile strength, moisture content, natural gypsum competition, climate, soil, plants and other fields. Human health hazards, secondary pollution of desulfurized gypsum, etc., to achieve the effects of high product quality, easy separation, and low equipment load

Pending Publication Date: 2017-05-31
北京金投清蓝环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the consequence of the limestone-gypsum wet desulfurization process is that a large amount of desulfurized gypsum is piled up and decomposed to cause secondary pollution, which is harmful to the climate, soil, plants and human health.
In addition, the by-product gypsum in the production process of many chemical companies has long been a problem
Moreover, these desulfurized gypsums cannot compete with natural gypsum in terms of purity, compressive and tensile strength, and moisture content, and have to occupy a large amount of current land as waste disposal

Method used

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  • System for desulfurization and magnesium sulfate heptahydrate co-production by using magnesium oxide
  • System for desulfurization and magnesium sulfate heptahydrate co-production by using magnesium oxide
  • System for desulfurization and magnesium sulfate heptahydrate co-production by using magnesium oxide

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Embodiment 1

[0049] A kind of method of magnesium oxide desulfurization co-production magnesium sulfate heptahydrate of the present invention comprises the following steps:

[0050] Step 1), the sulfur-containing flue gas enters from the lower part of the absorption tower, and is discharged from the flue gas outlet at the top of the absorption tower through the spray area of ​​the absorption tower and the demisting area of ​​the absorption tower in turn; the slurry sprayed by the spray head and the countercurrent flue gas Gas contact, the sulfur dioxide in the flue gas is absorbed by the slurry to form an absorption slurry;

[0051] Step 2), when the density of the absorbed slurry reaches 1150kg / m 3 Part of the slurry is discharged from time to time, and the discharged slurry is processed by a plate and frame filter press. After the filtered clear liquid enters the evaporator, the evaporated liquid is obtained, and then the evaporated liquid is pumped into the cooling crystallizer; the eva...

Embodiment 2

[0054] A kind of method of magnesium oxide desulfurization co-production magnesium sulfate heptahydrate of the present invention comprises the following steps:

[0055] Step 1), the sulfur-containing flue gas enters from the lower part of the absorption tower, and is discharged from the flue gas outlet at the top of the absorption tower through the spray area of ​​the absorption tower and the demisting area of ​​the absorption tower in turn; the slurry sprayed by the spray head and the countercurrent flue gas Gas contact, the sulfur dioxide in the flue gas is absorbed by the slurry to form an absorption slurry;

[0056] Step 2), when the density of the absorbed slurry reaches 1200kg / m 3 Part of the slurry is discharged from time to time, and the discharged slurry is processed by a plate and frame filter press. After the filtered clear liquid enters the evaporator, the evaporated liquid is obtained, and then the evaporated liquid is pumped into the cooling crystallizer; the eva...

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Abstract

The invention relates to a system and a method for desulfurization and magnesium sulfate heptahydrate co-production by using magnesium oxide. The system comprises an absorption tower, a slurry preparation device used for preparing magnesium hydroxide slurry, an oxidization device, a filter-press device used for filtering the slurry obtained after a reaction is finished, and a by-product preparation device, wherein a flue gas outlet is formed in the top of the absorption tower, an absorption tower flue gas inlet is formed in one side of the lower part of the absorption tower, and an absorbed slurry outlet is formed in the bottom of the absorption tower; a tower top chimney, an absorption tower demisting area, an absorption tower spray reaction area and an absorption tower slurry area are sequentially arranged in the absorption tower from top to bottom; the absorption tower demisting area is provided with a demister, and the absorption tower spray reaction area is provided with a spray head; the slurry preparation device is communicated with the absorption tower slurry area by a pipeline; the oxidization device is communicated with the absorption tower; the filter-press device is communicated with the absorbed slurry outlet; an inlet of the by-product preparation device is communicated with the filter-press device. A cooling crystallizer is adopted by the by-product preparation device, so that the system has the advantages of being large in particles of a prepared product, easy in separation of the product, high in product quality, low in load of separation and drying unit equipment, easy to operate, and the like.

Description

technical field [0001] The invention relates to the field of flue gas pollutant treatment, in particular to a device and method for removing sulfur dioxide in flue gas and generating magnesium sulfate heptahydrate as a by-product by using a magnesium oxide wet absorption process. Background technique [0002] Since the late 1970s, my country has introduced and assimilated foreign desulfurization technologies, and put them into experimental operation in a number of large and medium-sized power plants. The result of various comparisons is that the limestone-gypsum method has high efficiency, the desulfurizer is cheap and easy to obtain, the operation is relatively easy, and the supporting equipment has been industrialized, which has the conditions for vigorous promotion in the whole country. Up to now, the wet desulfurization industry in my country is mainly based on the limestone-gypsum method. [0003] However, the consequence of the limestone-gypsum wet desulfurization pro...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50C01F5/40
CPCB01D53/502B01D53/80C01F5/40B01D2251/402B01D2251/604B01D2258/0283
Inventor 洪显明任陈陈董春玲
Owner 北京金投清蓝环境科技有限公司
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