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.

为了抑制煤组合过程中NO_X和N_2O排放，有必要抑制CHAR氮的NO_X和N_2O的形成。纯碳和气相NO形成HCN的机制是研究的。可以澄清的是，在char表面上没有捕获NO，因此形成的表面氮种将转换为HCN和N2。还发现氢的量是确定HCN形成行为的重要因素。在存在O_2的情况下，HCN形成发生在较低温度区域，例如600℃。这是因为在碳-O_2反应中激活了表面氮气复合物。N_2，使用特殊设计的脉冲型反应器研究了1000-1300℃之间的高温区域的地层行为。再次得到证实，表面氮与气态NO之间的反应是N_2形成的主要反应。产品气体中的N_2/NO比随着CHAR转换的增加而降低。这表明CHAR对N_2构建的重要性。引入O_2时温度升高也会影响N_2/NO比率。这是关于在1300℃等高温下无碳反应的第一项基础研究，所获得的信息对于理解粉末化的燃料组成系统中的NO_X形成很有用。

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。