Simultaneous desulfurization and denitrification process of flue gas ammonia method based on fenton-like effect
A technology for desulfurization, denitrification, and flue gas, which is applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of loss of denitration ability and decrease in denitration efficiency, and achieves low market cost and easy availability, improved service life, and improved recovery. rate effect
Active Publication Date: 2018-07-24
武汉钢铁有限公司 +1
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However, because the flue gas contains a certain amount of oxygen, it is easy to oxidize Fe(II)EDTA in the absorption liquid, resulting in a decrease in denitrification efficiency, or even loss of denitrification ability.
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[0034] The physical parameters and related composition of the concentrate are as follows:
[0035] pH value: 5.0~5.5;
[0036] Ammonium sulfate concentration: 20-45% (mass percentage);
[0037] Total concentration of Fe(II)EDTA+Fe(III)EDTA: 0.045~0.15mol / L;
[0038] Oxalic acid concentration: 0.27~0.9mol / L;
[0039] Absorption liquid temperature: 50-55°C.
[0040] The physical parameters and related composition of the circulating absorption liquid are as follows:
[0041] pH value: 5.0~5.5;
[0042] Ammonium sulfate concentration: 5-15% (mass percentage);
[0043] Total concentration of Fe(II)EDTA+Fe(III)EDTA: 0.015~0.05mol / L;
[0044] Oxalic acid concentration: 0.09~0.3mol / L;
[0045] Absorption liquid temperature: 50°C.
[0046] see figure 1 , in a flue gas desulfurization system, the flue gas volume is about 14-16Nm 3 / h, SO 2 Concentration: 800~1200mg / Nm 3 , NOx concentration (mainly NO): 300~400mg / Nm 3 . Desulfurization uses a twin-tower process. The flue g...
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Abstract
The invention discloses a synchronous flue gas desulfurization and denitrification process with an ammonia method based on a Fenton-like effect. The synchronous flue gas desulfurization and denitrification process comprises the following steps: flue gas is fed into a concentration tower after pressurization and is subjected to contact reaction with concentrated liquid in the tower; the flue gas getting out of the concentration tower is fed into an absorption tower, is subjected to reverse contact reaction with circulation absorption liquid sprayed out from a spraying layer at the upper part of the tower, and then is discharged from the top of the absorption tower; part of concentrated liquid after reaction is led out from the tower bottom of the concentration tower, is subjected to iron removal through an iron removal system, and then is fed into an ammonium sulfate crystallization system; the flue gas enters the absorption tower from a flue gas inlet in the middle of the absorption tower, sequentially passes through at least one photochemical reaction layer, a filler layer and the spraying layer arranged at the upper part of the tower, is subjected to reverse contact reaction with the circulation absorption liquid, and then is discharged from the flue gas outlet; the circulation absorption liquid at the bottom of the absorption tower is supplemented with aqueous ammonia, a complexing agent Fe (II) EDTA, oxalic acid and ferrous sulfate and then is used as the circulation absorption liquid for being sent back to an injection tower on the spraying layer at the upper part of the absorption tower. The synchronous flue gas desulphurization and denitrification process provided by the invention is simple, low in operation cost, low in energy consumption, easy to control, good in denitrification effect and good in byproduct quality.
Description
technical field [0001] The invention relates to flue gas purification in the field of environmental protection, in particular to a flue gas ammonia synchronous desulfurization and denitrification process based on Fenton-like effects. Background technique [0002] The existing flue gas synchronous desulfurization and denitrification methods are divided into five categories according to the process: solid-phase adsorption / regeneration synchronous desulfurization and denitrification technology, gas-solid catalytic synchronous desulfurization and denitrification technology, absorbent injection synchronous desulfurization and denitrification technology, high-energy electron activation oxidation synchronous desulfurization and denitrification technology technology, wet flue gas synchronous desulfurization and denitrification technology. [0003] The Fe(II)EDTA method in the complexation absorption method is the most researched on the wet simultaneous desulfurization and denitrific...
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IPC IPC(8): B01D53/96B01D53/86B01D53/78B01D53/60
CPCB01D53/8637B01D53/965B01D2251/80B01D2255/802B01D2258/0283
Inventor 吴高明刘成吴晓琴
Owner 武汉钢铁有限公司