Wet redox, desulfuration and resource utilization method for flue gas

A technology of wet oxidation and recycling, which is applied in chemical instruments and methods, separation methods, and through absorption. It can solve the problems of high investment and operating costs, large water consumption, and large floor space, and achieve huge economic benefits.

Inactive Publication Date: 2013-04-03
HENAN LVDIAN ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • 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 investment and operation costs are high, the water consumption is large, and there is secondary pollution.

Method used

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  • Wet redox, desulfuration and resource utilization method for flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 125mL of a ferric chloride solution with a hydrogen ion concentration of 1mol / L and a ferric iron concentration of 2.0mol / L, and pass sulfur dioxide into it at 30°C and 1 atm. The input amount is 0.125mol, 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, and the sulfate concentration is 0.81mol / L.

[0028] Excessive oxygen is introduced into the solution produced after absorbing sulfur dioxide, so that the divalent iron in the solution becomes trivalent iron, and the obtained trivalent iron solution is recycled for absorbing sulfur dioxide.

[0029] Repeat the foregoing operations and after three cycles, the obtained high-concentration sulfate solution is concentrated, separated and crystallized to obtain 63.5 g of iron sulfate product containing crystal water. The mother liquor after crystallization is a mixture of sulfuric acid and hydrochloric acid, and iron oxide or ...

Embodiment 2

[0031] Take 250 mL of a ferric chloride solution with a hydrogen ion concentration of 0.64 mol / L and a ferric iron concentration of 1.0 mol / L, and pass sulfur dioxide into it at 30°C and 1 atmosphere. The input amount 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.

[0032] Excess oxygen is passed into the solution produced after absorbing sulfur dioxide, so that the divalent iron in the solution becomes trivalent iron, and the obtained trivalent iron solution is recycled for absorbing sulfur dioxide.

[0033] Repeat the foregoing operation, after three cycles, the obtained high-concentration sulfate solution is concentrated, separated and crystallized to obtain 59.2 g of iron sulfate product containing crystal water. The mother liquor after crystallization is a mixture of sulfuric acid and hydrochloric acid, and iron oxide or hy...

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Abstract

The invention relates to a wet redox, desulfuration and resource utilization method for flue gas. The method comprises the following steps of: leading the flue gas containing SO2 into an acidic ferric iron absorption liquid, and absorbing sulfur dioxide at 0 to 100 DEG C to generate a sulfate solution so as to finally realize a flue gas desulfurization purpose; after dissolving the sulfur dioxide into water, oxidizing the sulfur dioxide by ferric iron to generate a ferrous sulfate solution; leading an oxidant into the solution to carry out oxidization on the solution, transferring ferrous iron into ferric iron which is used for circularly absorbing the sulfur dioxide in the flue gas; and timely carrying out separation, purification and crystallization on absorption liquid when the concentration of sulfate radical in the absorption liquid obtained from flue gas desulfurization is obviously improved after multiple cycles. Therefore, the resource utilization of the flue gas is realized.

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 produced by fuel combustion contains sulfur oxides, which are harmful components, mainly sulfur dioxide and a trace amount 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 pre-combustion desulfurization is mainly to clean the raw coal used in the boiler by physical, chemical or biological methods, to remove the sulfur part of the coal, so that the coal can be purified; the combustion desulfurization technology is to perform desulfurization treatment during the coal combustion process, namely The coal is mixed with a sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50
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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