System and method for zero discharge of magnesium oxide method desulfurization wastewater

A technology for desulfurization wastewater and magnesium oxide, applied in chemical instruments and methods, separation methods, magnesium sulfate and other directions, can solve the problems of incomplete recovery and low product output value, etc.

Pending Publication Date: 2021-03-16
NANJING UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Some existing technologies use a dehydration system to recover crystalline salts such as magnesium sulfate, but due to the solubility of magnesium sulfate, the recovery will be incomplete;
[0004] Some desulfurization wastewater zero discharge technologies adopt the process route of "softening + membrane concentrat

Method used

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  • System and method for zero discharge of magnesium oxide method desulfurization wastewater

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Experimental program
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Embodiment 1

[0034] Taking the desulfurization wastewater treatment capacity of 2000kg / h as an example, the magnesium sulfate mass concentration therein is 10%. The temperature is 125~130℃, and the flue gas volume at 140℃ entering the thermal method reduction device is 22000m 3 / h, after concentrating, waste water reduction is 660kg / h, and flue gas is cooled to 50 ℃, when the mass concentration of magnesium sulfate solution reaches 30% in thermal method decrementing device (5), after waste water enters sedimentation tank (11), add Diatomaceous earth produces precipitation, wherein: the thermal method reduction device (5) adopts an empty tower spray structure, and the upper part of the tower is equipped with a spray device, and the nozzle adopts a spiral type, so that the atomized particle size of the wastewater is less than 500 μm; A circulating pump (17) is arranged outside the metering device (5), and the circulating pump (17) can spray the magnesium desulfurization wastewater back and f...

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Abstract

The invention discloses a system and method for zero discharge of magnesium oxide method desulfurization wastewater, and belongs to the field of environmental protection. The system comprises a magnesium oxide method desulfurization absorption tower and a hot method decrement device, flue gas generated after boiler combustion is connected with the magnesium oxide method desulfurization absorptiontower sequentially through an air preheater and a dust remover, the output end of the bottom of the magnesium oxide method desulfurization absorption tower is connected with a waste water tank, and the output end of the bottom of the waste water tank is connected with the hot method decrement device. The output end of the bottom of the thermal decrement device is connected with a sedimentation tank, the output end of the top of the sedimentation tank is connected with a spray drying tower through a clear liquid tank, and the bottom end of the spray drying tower stores a target product. The system and method have the characteristics of low system investment, high additional value of byproducts, no secondary waste and the like.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a system and method for zero discharge of desulfurization wastewater by magnesium oxide method. Background technique [0002] Magnesium desulfurization technology is a wet desulfurization process based on active magnesium oxide, which has the advantages of environmental friendliness, resource saving, and high resource utilization rate. However, most of the magnesium sulfate and magnesium sulfite slurries after desulfurization in the existing magnesium oxide desulfurization process are directly discharged, resulting in the waste of crystalline salts such as magnesium sulfate and magnesium sulfite, and the by-products cannot be effectively used. Raw material consumption is high. High one-time investment. [0003] Some existing technologies use a dehydration system to recover crystalline salts such as magnesium sulfate, but due to the solubility of magnesium sulfate, the re...

Claims

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Application Information

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IPC IPC(8): C01F5/40C01F5/42B01J2/02B01D53/78B01D53/50
CPCC01F5/40C01F5/42B01J2/02B01D2251/402B01D53/507Y02P20/129
Inventor 徐海涛宋静周长城沈凯李明波徐梦支晓欢
Owner NANJING UNIV OF TECH
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