Method for removing nitrogen oxide in flue gas, and nano flue gas denitration system
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A technology of nitrogen oxides and flue gas, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve the problems of increasing manufacturing and operating costs
Active Publication Date: 2014-07-30
林小晓 +1
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Therefore, on the whole, the current domestic SCR equipment and materials all have to rely on foreign imports, which also virtually increases its manufacturing and operating costs.
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Embodiment 1
[0079] Embodiment 1: a kind of method for eliminating nitrogen oxides in flue gas is characterized in that it comprises the following steps:
[0080] (1) The flue gas containing nitrogen oxides is pretreated in the pretreatment container. The pretreatment process removes solid particles with a diameter greater than 10 microns in the flue gas and oxidizes NO to NO 2 :
[0081] A solution containing an oxidizing agent and having a pH value less than or equal to 3 is added to the pretreatment container;
[0082] Pass the flue gas into the pretreatment container, fully contact with the liquid, so that the solid particles with a diameter greater than 10 microns remain in the solution, and NO is oxidized to NO 2 ;
[0083] Export the solution containing solid particles out of the pretreatment container;
[0084] (2) The pretreated flue gas enters the denitrification container, and the nitrogen oxides react with the oxidant to generate nitric acid:
[0085] A solution containing ...
Embodiment 2
[0127] Embodiment 2: a kind of method for eliminating nitrogen oxides in flue gas is characterized in that it comprises the following steps:
[0128] (1) The flue gas containing nitrogen oxides is pretreated in the pretreatment container. The pretreatment process removes solid particles with a diameter greater than 10 microns in the flue gas and oxidizes NO to NO 2 :
[0129] A solution containing an oxidizing agent and having a pH value less than or equal to 3 is added to the pretreatment container;
[0130] Pass the flue gas into the pretreatment container, fully contact with the liquid, so that the solid particles with a diameter greater than 10 microns remain in the solution, and NO is oxidized to NO 2 ;
[0131] Export the solution containing solid particles out of the pretreatment container;
[0132] (2) The pretreated flue gas enters the denitrification container, and the nitrogen oxides react with the oxidant to generate nitric acid:
[0133] A solution containing ...
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Abstract
The invention relates to a method for removing nitrogen oxide in flue gas. The method comprises the following steps of (1) carrying pretreatment on the flue gas containing nitrogen oxide in a pretreatment container, removing solid particles with the diameters larger than 10 microns in the flue gas in the pretreatment process, and oxidizing NO into NO2; (2) enabling the pretreated flue gas to enter a denitration container, and reacting nitrogen oxide with an oxidizing agent to generate nitric acid; and (3) after purification, discharging the gas outside the denitration container. The invention also provides a nano flue gas denitration system which is characterized by comprising a pretreatment bin and a denitration bin, wherein the output end of the pretreatment bin is connected with the input end of the denitration bin. The method and the nano flue gas denitration system have the advantages that nitrogen oxide is effectively converted into nitric acid, so that the recycling benefit is far higher than the operating cost of equipment, and a user can obtain more profit. The method and the nano flue gas denitration system are suitable for other industrial markets such as a cement plant, an iron and steel plant, a municipal government waste burning plant, a medical waste burning plant, a chlorine manufacturer, and a pulp and paper manufacturing plant.
Description
(1) Technical field: [0001] The invention relates to a waste gas treatment method and system, in particular to a method for eliminating nitrogen oxides in flue gas and a nano flue gas denitrification system. (two) background technology: [0002] Nitrate (NOx) is a general term for nitrogen oxides, the term refers to NO and NO 2 (Nitric Oxide and Nitric Oxide) combined concentration. Nitrogen oxides and volatile organic compounds (VOCs) in the air react chemically in sunlight to form ozone. Children and those who work or exercise outdoors are susceptible to the adverse effects of ozone. Ozone can cause asthma, damage lung tissue, and reduce lung function. Ozone can also be transported by wind and air currents, and has far greater health impacts than the original nitrogen oxides. Other effects of ozone include damage to plant growth leading to reduced crop yields. In addition, nitrogen oxides and sulfur dioxide react with other substances in the air to form acid rain, mix...
Claims
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