Wet-type redox desulfurizing and recycling method for smoke

A wet oxidation and resource-recycling technology, applied in chemical instruments and methods, separation methods, iron halide, etc., can solve the problems of high investment and operating costs, large water consumption, and large equipment, and achieve huge economic benefits.

Inactive Publication Date: 2012-12-19
HENAN LVDIAN ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of the wet FGD process are that the equipment is huge, the floor area is large, the in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 125 mL of ferric chloride solution with a hydrogen ion concentration of 1 mol / L and a ferric iron concentration of 2.0 mol / L, and feed sulfur dioxide into it at 30°C under 1 atmospheric pressure, the amount of feed is 0.125 mol, and the reaction time is 0 -1.5h, the absorption liquid becomes shallow. The test result is: hydrogen ion concentration = 1.56mol / L, Fe 2+ =1.47mol / L, the sulfate concentration is 0.81mol / L.

[0022] Excessive oxygen is introduced into the solution generated after the absorption of sulfur dioxide, so that the ferrous iron in the solution becomes ferric iron, and the obtained ferric iron solution is recycled for absorbing sulfur dioxide.

[0023] Repeat the aforementioned operations, and after three cycles, the obtained high-concentration sulfate radical solution was concentrated, separated and crystallized to obtain 63.5 g of ferric sulfate product containing crystal water. The crystallized mother liquor is a mixture of sulfuric acid and ...

Embodiment 2

[0025] Take 250 mL of ferric chloride solution with a hydrogen ion concentration of 0.64 mol / L and a ferric iron concentration of 1.0 mol / L, and feed sulfur dioxide at 30°C under 1 atmospheric pressure. The amount of feed is 0.125 mol, and the reaction time is 0-1.5h, the absorption liquid becomes shallow. The test result is: hydrogen ion concentration = 1.07mol / L, Fe 2+ =0.86mol / L, the sulfate concentration is 0.45mol / L.

[0026] Excessive oxygen is introduced into the solution after sulfur dioxide is collected, so that the divalent iron in the solution becomes ferric iron, and the obtained ferric iron solution is circulated to absorb sulfur dioxide.

[0027] Repeat the aforementioned operations, after three cycles, the obtained high-concentration sulfate radical solution was concentrated, separated and crystallized to obtain 59.2 g of ferric sulfate product containing crystal water. The mother liquor after crystallization is a mixture of sulfuric acid and hydrochloric acid...

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Abstract

The invention relates to a wet-type redox desulfurizing and recycling method for smoke, which comprises the following steps: introducing the smoke containing SO2 into acidic trivalent ferric absorption solution, absorbing SO2 at the temperature of 0-100 DEG C to generate sulfate solution, thereby realizing the purpose of desulfurizing the smoke at last; after dissolving SO2 into water, oxidizing by trivalent ferric to generate ferrous sulfate aqueous solution; oxidizing the ferrous sulfate aqueous solution by introducing oxygen so as to convert divalent ferric into trivalent ferric to reuse for absorbing SO2 in the smoke; performing separation, purification and crystallization in time since the concentration of sulfate radical in the smoke desulfurizing absorption solution is obviously increased after circulations for many times, so as to obtain ferric sulfate or ferric chloride to recycle the resource.

Description

technical field [0001] The invention relates to a flue gas purification method, in particular to a flue gas wet redox desulfurization and resource utilization method. Background technique [0002] The gas generated by the combustion of fossil fuels contains harmful sulfur oxides, mainly sulfur dioxide and trace amounts of sulfur trioxide. The process of eliminating sulfur dioxide and purifying exhaust gas is called desulfurization. [0003] There are three ways to apply desulfurization technology at home and abroad: desulfurization before combustion, desulfurization during combustion and desulfurization after combustion. The main content of desulfurization before combustion is to use physical, chemical or biological methods to clean the raw coal used in the boiler to remove the sulfur in the coal so that the coal can be purified; the desulfurization technology in combustion is to perform desulfurization during the coal combustion process. That is, the coal is mixed with a ...

Claims

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Application Information

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IPC IPC(8): B01D53/14B01D53/78B01D53/50B01D53/96C01G49/14C01G49/10
CPCY02C10/06Y02C20/40Y02P20/151
Inventor 田文学贾汉东李慧陈晨
Owner HENAN LVDIAN ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH
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