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Flue gas wet-type oxidation denitration and resource utilization method

A wet oxidation and resource utilization technology, applied in the field of flue gas purification, can solve the problems of high operating cost, large equipment investment, high construction cost, etc., and achieve huge economic benefits.

Inactive Publication Date: 2012-11-28
HENAN LVDIAN ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the invention right of SCR flue gas denitrification technology belongs to the United States, and it has the disadvantages of high cost, large equipment investment, high operating cost, insufficient catalyst strength and easy poisoning.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 1L of ferric chloride solution with hydrogen ion concentration of 1mol / L and ferrous iron concentration of 2.7mol / L, then feed nitrogen monoxide gas at 30°C under one atmospheric pressure, the amount of feed is 1.7mol, and the reaction The time is 0-4h until the absorption liquid turns dark brown and stops. After standing still for 1h, the absorption liquid is fed with 1.35mol of oxygen, and the reaction time is 3-5h. The released nitrogen dioxide gas is absorbed by 1L of distilled water until the released Until there is no nitrogen dioxide in the residual gas. The concentration of nitric acid contained in the absorption liquid was measured to be 0.77 mol / L.

Embodiment 2

[0021] Take a part of the flue gas discharged from a pit mouth power plant, pass it into a ferrous iron solution with a hydrogen ion concentration of 1mol / L and a concentration of 1.8mol / L, and absorb NO at 70°C X Generate dark brown mixed solution of nitrosoferrous salt, nitric acid and nitrous acid. After one year, take 5L of the mixed solution gained from denitrification treatment, feed excess oxygen, and the blown nitrogen dioxide is absorbed by water to obtain a concentration of 200ml of 0.1mol / L dilute nitric acid solution. This shows that the temperature is high and the time is long, the absorption effect and resource utilization effect will be reduced.

Embodiment 3

[0023] Get hydrogen ion concentration and be 0.7mol / L, divalent iron concentration is 300ml of ferric chloride solution of 1.3mol / L, then at 30 ℃, under one atmospheric pressure, pass into nitric oxide gas, and pass into amount is 0.39mol, The reaction time is 0-3h until the absorption liquid turns dark brown and stops. After standing for 1 hour, the absorption liquid is fed with 0.22mol of oxygen, and the reaction time is 0-5h. The released nitrogen dioxide gas is absorbed by 500ml distilled water until it is released until there is no nitrogen dioxide in the residual gas. The concentration of nitric acid contained in the absorption liquid was measured to be 0.48 mol / L.

[0024] The flue gas wet oxidation denitrification and resource utilization method provided by the present invention has the following beneficial effects:

[0025] 1. Change the existing treatment process to achieve denitrification while reducing investment costs, device scale, and operating costs. This is a...

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PUM

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Abstract

The invention relates to a flue gas wet-type oxidation denitration and resource utilization method which comprises the following steps of: leading the glue gas containing NOX into an acid ferrous iron solution; absorbing NOX at 0-100 DEG C to generate a dark brown mixed solution consisting of nitroso ferrite, nitric acid and nitrous acid to finally realize the flue gas denitration processing; and adding an oxidant into the denitration absorption liquid so that the nitrogen dioxide is discharged and dissolved in water, ammonia water, potassium hydroxide or sodium hydroxide solution to generate nitric acid, ammonium nitrate, potassium nitrate, sodium nitrate and the like so as to realize resource utilization.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a flue gas wet oxidation denitrification and resource utilization method. Background technique [0002] The gas generated by the combustion of mineral fuels contains harmful components of nitrogen oxides, mainly nitrogen monoxide, nitrogen dioxide, dinitrogen trioxide and trace nitrogen pentoxide, abbreviated as NO X . Eliminate NO X , The process of purifying the exhaust gas is called denitrification. [0003] At present, the control methods for NOx produced by combustion in my country mainly include three types: pre-combustion control, combustion control and post-combustion control. Pre-combustion control refers to the selection of low-nitrogen fuel, but the cost is high and there are few engineering applications. Combustion control refers to improving the combustion mode and production process, adopting low-NOx combustion technology, and reducing the amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/56
CPCY02C20/10Y02A50/20
Inventor 田文学贾汉东李慧陈晨
Owner HENAN LVDIAN ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH
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