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Method for dechlorinating desulfurization slurry with ammonium sulfate-limestone method

A desulfurization slurry, limestone technology, applied in separation methods, chemical instruments and methods, gas treatment and other directions, can solve serious, environmental pollution and other problems, and achieve the effect of cost saving

Active Publication Date: 2016-04-06
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of wastewater contains heavy metals such as mercury, which is very polluting to the environment.

Method used

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  • Method for dechlorinating desulfurization slurry with ammonium sulfate-limestone method

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Embodiment 1

[0028] figure 1 Medium ammonium sulfate dissolution kettle 1, electrolytic cell 2, kettle reactor 3; process water A, ammonium sulfate B, filtrate C, chlorine gas D, dechlorination filtrate E.

[0029] When the chloride ion content in the ammonium sulfate-limestone method slurry was 5000mg / L, add the ammonium sulfate dissolving kettle 1 with supplemented ammonium sulfate B, dissolve and prepare 30% solution with process water A, take this ammonium sulfate solution as raw material, in At a temperature of 15°C, Pt is used as the anode, Pb is used as the cathode, the polytetrafluoroethylene cationic membrane is used as the diaphragm, and 0.05% ammonium polyphosphate additive is added to the anode, and ammonium persulfate is electrolyzed in the electrolytic cell 2;

[0030] In the tank reactor 3, ammonium persulfate and gypsum dehydration filtrate C are mixed and stirred at a high speed, redox reaction occurs, chlorine gas D is released, chlorine gas D is pumped out and sent to po...

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Abstract

The invention relates to a method for dechlorinating desulfurization slurry with an ammonium sulfate-limestone method and belongs to the field of treatment of coal-fired flue gas. Furthermore, according to the method provided by the invention, supplemented ammonium sulfate is electrolyzed to prepare ammonium persulfate; then the ammonium persulfate is mixed and stirred with a desulfurization gypsum dehydration filtrate to release chlorine gas; and the chlorine-free filtrate is conveyed back to an absorption tower, so that the content of chlorine in the slurry is reduced. The method provided by the invention has the beneficial effects that (1) the slurry is not directly dechlorinated and the desulfurization gypsum dehydration filtrate is dechlorinated, so that the interference on dechlorination, caused by a desulfurization intermediate product in the desulfurization slurry, is avoided; (2) the supplemented ammonium sulfate is used as a raw material and the ammonium persulfate is produced by adopting an electrolysis method; an electrolyzed product does not need to be concentrated and separated and can directly enter a reaction step, so that the cost is saved; (3) in the reaction step, high-speed mixing and stirring are adopted, a reaction is promoted and the releasing of chlorine gas is facilitated; (4) the problem of controlling chlorine ion content in the desulfurization slurry is perfectly solved and the discharging of wastewater is reduced.

Description

technical field [0001] The invention belongs to the field of boiler tail gas treatment. The invention relates to a method for dechlorination of ammonium sulfate-limestone desulfurization slurry, more specifically, for the removal of chloride ions in the ammonium sulfate-limestone method flue gas desulfurization slurry, ammonium persulfate is prepared by electrolysis of supplemented ammonium sulfate , and then mixed with the desulfurized gypsum dehydrated filtrate to release chlorine gas, and the dechlorinated filtrate is sent back to the absorption tower, thereby reducing the chlorine content in the slurry. Background technique [0002] There are two main sources of chloride ions in the ammonium sulfate-limestone desulfurization slurry: one is that the chlorine contained in the coal is burned to form chlorides and enters the desulfurization tower with the flue gas, and enters the desulfurization slurry under wet washing; the other is the process water. , water evaporates in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/96B01D53/80B01D53/48
CPCB01D53/48B01D53/80B01D53/965B01D2251/404B01D2259/126
Inventor 陶俊徐继红
Owner ANHUI UNIV OF SCI & TECH
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