Ammonia oxidizing denitration process and reaction apparatus

A reaction device and denitrification technology, applied in the field of flue gas denitrification, can solve the problems of high flue gas temperature, unfavorable resource recycling, and high process cost, and achieve the advantages of increasing ammonium nitrate content, improving reusability, and efficient denitrification treatment. Effect

Inactive Publication Date: 2016-08-17
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0003] At present, the commonly used methods for flue gas denitrification in industry include selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR) and combined SCR-SNCR denitrification. Will N 2 and H 2 Synthetic NH 3 , while N 2 and H 2 All need to use fossil fuels as raw materials to prepare through complex processes such as gas generation, decarbonization, and desulfurization. Therefore, the reduction denitrification technology relies on a large amount of fossil fuels to achieve denitrification, which does not conform to the concept of circular economy, and the process cost is high.
Ammonia oxidative denitrification is a method that can make NOx resources, but the traditional ammonia oxidative denitrification process is easy to cause ammonia to escape and form secondary pollution
Chinese patent application CN103801176A discloses a method of using ozone to oxidize all nitric oxide into dinitrogen pentoxide for efficient denitrification. Howeve

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  • Ammonia oxidizing denitration process and reaction apparatus

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Embodiment 1

[0030] This embodiment relates to the evaluation of the denitrification efficiency of the ammonia oxidation denitrification process described in the present invention. The following embodiments are all in figure 1 in the reaction device.

Embodiment 11

[0032] The flue gas after desulfurization and dust removal is passed into the flue gas input pipeline of the reaction device, and the NO content in the flue gas passed through is tested to be 300mg / m 3 , spray ozone into the direction of 90 degrees with the flow direction of the flue gas through the ozone spray gun, the amount of ozone added is 0.6 times the molar amount of NO in the flue gas, the flue gas added with ozone stays in the static mixer for 6s, and then Enter the first-level absorption chamber of the absorption tower, and spray the first-level absorption liquid with a pH value of 8 and a mixed salt solution of ammonia water and ammonium nitrate in the first-level absorption room, and circulate the first-level absorption liquid through the primary circulation pump. Spray to form a primary absorption liquid spray layer with a height of 2 to 3 meters. During the circulating spraying process, detect the ammonium nitrate concentration of the primary absorption liquid. Wh...

Embodiment 12

[0035] The flue gas after desulfurization and dust removal is passed into the flue gas input pipeline of the reaction device, and the NO content in the flue gas passed through is detected to be 260mg / m 3 , spray ozone into the direction of 90 degrees with the flow direction of the flue gas through the ozone spray gun, the amount of ozone added is 0.5 times the molar amount of NO in the flue gas, the flue gas added with ozone stays in the static mixer for 4s, and then Enter the primary absorption chamber of the absorption tower, and spray the primary absorption liquid with a pH value of 8.2 and a mixed salt solution of ammonia and ammonium nitrate in the primary absorption chamber, and circulate the primary absorption liquid through the primary circulation pump. Spray to form a primary absorption liquid spray layer with a height of 2 to 3 meters. During the circulating spraying process, detect the ammonium nitrate concentration of the primary absorption liquid. When it reaches 1...

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Abstract

The present invention provides an ammonia oxidizing denitration process for flue gas denitration treatment. Ozone oxidation, hydrogen peroxide oxidation and ammonia absorption are orderly and organically combined, in order to achieve efficient flue gas denitration treatment. The treatment process has low energy consumption, low operating costs and high absorption rate, is able to recycle nitrogen resources, and does not produce secondary pollution caused by the escape of ammonia. At the same time, the present invention also provides an ammonia oxidizing denitrification reaction apparatus, which is beneficial for the flue gas continuous treatment, and improves the processing efficiency.

Description

technical field [0001] The invention relates to the technical field of flue gas denitration, in particular to an ammonia oxidation and denitration process, and also relates to an ammonia oxidation and denitration reactor suitable for the process. Background technique [0002] Coal resources are the main energy source in our country, but a large amount of nitrogen oxides (NOx) will be emitted after coal combustion. NOx can not only form acid rain and other secondary pollutants, but also seriously endanger human health and directly affect people's normal life. During the "Twelfth Five-Year Plan" period, my country will reduce NOx emissions as one of the main goals, so the flue gas must be treated with efficient denitrification to meet the emission standards. [0003] At present, the commonly used methods for flue gas denitrification in industry include selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR) and combined SCR-SNCR denitrification. Will N ...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/76B01D53/78B01D53/56
CPCB01D53/56B01D53/75B01D53/76B01D53/78B01D2251/104B01D2251/106B01D2251/60B01D2258/0283B01D2259/122B01D2259/124
Inventor 孙涛略赵晗拓王建英胡永琪田月
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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