Study on the NO_x formation and decomposition mechanism at high temperatures

高温下NO_x生成与分解机理研究

• 批准号: 13450332
• 负责人: TOMITA Akira
• 金额: $ 8.9万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450332/
• 关键词: NO; Char; HCN; Pulse reactor

In order to suppress the NO_x and N_2O emissions during coal combustion, it is necessary to suppress the formatione of NO_x and N_2O from char nitrogen. The mechanism of HCN formation from pure carbon and gas-phase NO was studied. It was clarified that NO is captured on the char surface and the surface nitrogen species thus formed is converted to HCN and N2. It was also found that the amount of hydrogen is an important factor to determine the HCN formation behavior. In the presence of O_2, HCN formation takes place in a lower temperature region like 600 ℃. This is because the surface nitrogen complexes are activated during the carbon-O_2 reaction.N_2 and NO formation behaviors at a high temperature region between 1000-1300 ℃ were investigated using a specially designed pulse-type reactor. Again it was confirmed that the reaction between the surface nitrogen species with gaseous NO is the main reaction for N_2 formation. N_2/NO ratio in the product gas decreased with increasing char conversion. This indicates the importance of the amount of char for N_2 formation. The temperature increase upon the introduction of O_2 also affects the N_2/NO ratio. This is the first fundamental study on the NO-carbon reaction at a high temperature like 1300 ℃, and the information obtained is useful to understand the NO_x formation in a pulverized fuel combustion system.

为了抑制纯碳和气相NO的煤燃烧机理中的NO_X N_2O排放，在表面氮种上捕获了纯净的碳和气相。 。反应器。 N_2/NO比例（如1300°C），获得的信息是了解粉碎燃料燃烧系统中的NO_X形成。

项目成果

H. Orikasa, K. Matsuoka, T. Kyotani, A. Tomita: "HCN ard N_2 Formation Mechanism during NO/Char Reaction"Proc. Comb. Inst.. in press. (2003)

H. Orikasa、K. Matsuoka、T. Kyotani、A. Tomita：“NO/Char 反应过程中的 HCN ard N_2 形成机制”Proc。

H.Orikasa, A.Tomita: "No and N_2 Formation behavior during a High-Temperature O_2-Gasification of Coal Char"Energy Fuels. 17(2). 405-411 (2003)

H.Orikasa、A.Tomita：“煤焦高温 O_2 气化过程中 No 和 N_2 的形成行为”能源燃料。

H.Orikasa, A.Tomita: "NO and N_2 Formation behavior during a High-Temperature O_2-Gasification of Coal Char"Energy Fuels. (in press). (2003)

H.Orikasa、A.Tomita：“煤焦高温 O_2 气化过程中 NO 和 N_2 的形成行为”能源燃料。

H.Orikasa, K.Matsuoka, T.Kyotani, A.Tomita: "HCN and N_2 Formation Mechanism during NO/Char Reaction"Proc. Comb. Inst. (in press). (2003)

H.Orikasa、K.Matsuoka、T.Kyotani、A.Tomita：“NO/Char 反应过程中的 HCN 和 N_2 形成机制”Proc。