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Integrated wet-type oxidation, desulfurization, denitration and recycling method for smoke

A technology of desulfurization, denitrification and wet oxidation, applied in chemical instruments and methods, separation methods, air quality improvement and other directions, can solve the problems of high energy consumption of the device, high cost of organic solvents, catalyst stabilization and regeneration reduction, collection of by-products and other problems, achieve huge economic benefits

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

AI Technical Summary

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 1L of ferric chloride solution with a hydrogen ion concentration of 1mol / L and a ferric iron concentration of 1.66mol / L. At 30°C and one atmosphere, simultaneously pass sulfur dioxide and nitric oxide gas with 0.84mol respectively. , 1.66mol, the reaction time is 0-3h until the absorption liquid becomes dark brown and stops. After standing for 1h, 0.83mol of oxygen is introduced into the absorption liquid, and the reaction time is 0-5h. The released nitrogen dioxide gas is 1L distilled water Absorb until there is no nitrogen dioxide in the released residual gas. The concentration of nitric acid contained in the absorption liquid was measured to be 0.78 mol / L.

[0023] A proper amount of oxygen is passed into the absorption solution after the oxidation treatment, and the divalent iron in the solution is converted into trivalent iron. The obtained solution was concentrated and recrystallized to obtain 138 g of iron sulfate product containing crystal water, 114 g of iro...

Embodiment 2

[0025] Take 1L of a mixed solution of ferric chloride and ferrous chloride with a hydrogen ion concentration of 0.6mol / L, a ferric iron concentration of 1.66mol / L, and a ferric iron solution concentration of 0.54mol / L. Sulfur dioxide and nitric oxide gas were introduced at the same time under atmospheric pressure. The input amounts were 0.84mol and 2.2mol respectively. The reaction time was 0-3h until the absorption liquid turned dark brown and stopped. After standing for 1h, the absorption liquid was introduced 1.1mol Oxygen, the reaction time is 0-5h, the released nitrogen dioxide gas is absorbed by 1L of distilled water until there is no nitrogen dioxide in the released residual gas. The concentration of nitric acid contained in the absorption liquid was measured to be 0.88mol / L.

[0026] A proper amount of oxygen is passed into the absorption solution after the oxidation treatment, and the divalent iron in the solution is converted into trivalent iron. The obtained solution ...

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PUM

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Abstract

The invention discloses an integrated wet-type oxidation, desulfurization, denitration and recycling method for smoke, which comprises the following steps: introducing the smoke containing SO2 and NOx into acidic trivalent ferric solution or mixed solution of trivalent ferric and divalent ferric, absorbing NOx and SO2 under a condition with the temperature of 0-100 DEG C to generate dark brown nitroso ferrite (Fe<2+>), sulfate and a little amount of mixed solution composed of nitric acid and nitrous acid so as to realize desulfurization and denitration treatmentfor the smoke; adding oxidant into the desulfurization and denitration absorption solution to release nitrogen dioxide for dissolving in water, ammonia water, potassium hydroxide or sodium hydroxide solution to generate nitric acid, ammonium nitrate, potassium nitrate and sodium nitrate and so on, thereby recycling the resource.

Description

Technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a flue gas wet oxidation integrated desulfurization, denitrification and resource utilization method. Background technique [0002] Due to the different composition of some mineral fuels, the flue gas produced during combustion contains both nitrogen oxides and sulfur dioxide, and the latter usually contains more than the former. Desulfurization and denitrification technologies can be divided into two categories: simultaneous desulfurization and denitration technology in the combustion process in the furnace and desulfurization and denitration technology in the flue gas after combustion. Because the simultaneous desulfurization and denitration technology in the combustion process affects the degree of coal combustion and reduces the thermal efficiency of the boiler As a result, the simultaneous desulfurization and denitrification of flue gas after combustion has become t...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/60
CPCB01D53/60Y02A50/20
Inventor 田文学贾汉东李慧陈晨
Owner HENAN LVDIAN ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH
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