Flue gas wet reduction integrated desulfurization, denitrification, harmless treatment and resource utilization method

A desulfurization, denitrification, and harmless treatment technology, which is applied in chemical instruments and methods, separation methods, air quality improvement, etc., can solve the problems of high energy consumption of devices, high cost of organic solvents, catalyst stabilization, regeneration and reduction, and collection of by-products, etc. problems, to achieve the effect of reducing operating costs

Inactive Publication Date: 2013-03-27
HENAN LVDIAN ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the dry processes represented by the electron beam irradiation (ER) method, activated carbon adsorption desulfurization and denitrification, and ammonia method have good desulfurization and denitrification efficiencies, problems such as high energy consumption of the device and subsequent collection of by-products have plagued its development. The essential
The wet process represented by lye absorption method, oxidation absorption method, iron-cobalt complex complex absorption, etc. also has the reuse of lye, the volatilization of organic solvents and high costs, the stability of catalysts and regeneration and reduction. , effective disposal of by-products and other difficult problems

Method used

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  • Flue gas wet reduction integrated desulfurization, denitrification, harmless treatment and resource utilization method

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Effect test

Embodiment 1

[0025] Take 1 L of ferric chloride solution with a hydrogen ion concentration of 1 mol / L and a ferric iron concentration of 1.66 mol / L, and feed sulfur dioxide and nitrogen monoxide gas simultaneously at 30°C under one atmospheric pressure, the amount of which is 0.84 mol respectively , 1.66mol, the reaction time is 0-3h, stop until the absorption liquid turns dark brown, after standing for 1 hour, add 110g sodium sulfite solid and 5g activated carbon catalyst to the absorption liquid, stir well, the released gas is detected by gas detector, mainly The composition is nitrogen, no nitrogen oxides detected

[0026] A proper amount of oxygen is passed into the absorption solution after the above reduction treatment, and the divalent iron in the solution is converted into ferric iron. The resulting solution was concentrated and recrystallized to obtain 226 g of ferric sulfate product containing crystal water, 51 g of ferric chloride containing crystal water and a small amount of s...

Embodiment 2

[0028] Take 1 L of a mixed solution of ferric chloride and ferrous chloride with a hydrogen ion concentration of 0.6 mol / L, a ferric iron concentration of 1.66 mol / L, and a ferrous iron solution concentration of 0.54 mol / L. Simultaneously feed sulfur dioxide and nitrogen monoxide gas under atmospheric pressure, the feeding amount is 0.84mol, 2.2mol respectively, the reaction time is 0-3h, stop until the absorption solution turns dark brown, after standing for 1h, add 127g sodium sulfite to the absorption solution The solid and 5g of activated carbon catalyst were fully stirred, and the released gas was detected by a gas detector. The main component was nitrogen, and no nitrogen oxides were detected.

[0029] A proper amount of oxygen is passed into the absorption solution after the above reduction treatment, and the divalent iron in the solution is converted into ferric iron. The resulting solution was concentrated and recrystallized to obtain 259 g of ferric sulfate product c...

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Abstract

The invention discloses a flue gas wet reduction integrated desulfurization, denitrification, harmless treatment and resource utilization method. The method includes that flue gases containing SO2 and NOX are fed into an acid ferric iron solution or a ferric iron and ferrous iron mixed solution, and the NOX and the SO2 are absorbed at the temperatures of 0-100 DGE C to generate dark brown nitroso ferrous salt, sulfate and a small amount of mixed solution composed of nitric acid and nitrous acid. A reducing agent and a catalytic agent are added into the mixed solution so that an absorbed nitroso group is converted into nitrogen, and harmless treatment is achieved; and finally, an absorption solution which is subjected to harmless treatment is subjected to oxidization, separation and crystallization to prepare ferric sulfate or ferric chloride products, and resource utilization of the flue gases is achieved.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a flue gas wet reduction integrated desulfurization and denitrification and harmless treatment and resource utilization method. Background technique [0002] Due to the difference in fuel composition, the flue gas produced during combustion contains both nitrogen oxides and sulfur dioxide, usually the latter content is greater than the former. Desulfurization and denitrification technology can be divided into two categories: simultaneous desulfurization and denitrification technology in the combustion process in the furnace and desulfurization and denitrification technology in the flue gas after combustion. Due to the existence of simultaneous desulfurization and denitrification technology in the combustion process, it affects the combustion degree of coal and reduces the thermal efficiency of the boiler. Therefore, simultaneous desulfurization and denitrification o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/60
CPCY02A50/20
Inventor 田文学贾汉东李慧陈晨
Owner HENAN LVDIAN ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH
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