SYNTHESIS OF SILICON CARBIDE BY FUEL-RICH COMBUSTION IN CERAMIC SURFACE BURNER

陶瓷表面燃烧器富燃料燃烧合成碳化硅

• 批准号: 10650743
• 负责人: ITAYA Yoshinori
• 金额: $ 2.24万
• 依托单位: NAGOYA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650743/
• 关键词: COMBUSTION SYNSESIS; FUEL-RICH COMBUSTION; POROUS CERAMIC BURNER; COMBUSTION BY OXYGEN; SILICON CARBIDE; REACTION KINETICS; 予混合燃焼; ハニカム; メタン-空気燃料; 素反応モデル解析

The porous ceramic surface burner, in which flame is formed along the surface on a porous ceramic plate, has flammability limit in wide region of equivalence ratio. If the combustion of a methane-oxygen mixture at high temperature can take place under a fairly fuel-rich equivalence ratio, silicon dioxide may be converted to silicon carbide. In the present study, an application of the surface burner to the combustion synthesis of silicon carbide was proposed and the possibility was investigated fundamentally. The following knowledge was obtained : 1) The surface burner was assembled by using ceramic honeycomb and flashback was not observed from the test of flammability limit. 2) The fuel-rich combustion of the burner achieved up to 3.0 in equivalence ratio, but soot generation became significant. 3) The thin flame attached on the surface of honeycomb in less equivalence ratio than 1.5 while the length of the flame attached on the surface of honeycomb in less equivalence ratio than 1.5 w … More hile the length of the flame was enlarged with elevation of the equivalence ratio beyond 1.5. 4) The chemical reaction kinetic model was analyzed on the basis of the elementary reactions with 31 species. The analytical result showed that the composition and temperature satisfied the condition required for the carbonizing reaction of silicon dioxide in the higher equivalence ratio than 2.0. 5) A piece of quartz glass was examined to synthesize a film of silicon carbide on the slab in the fuel-rich flame of the burner. However the production was not detected by XRD analysis because the sample could not maintain sufficiently high temperature necessary for the reaction due to large radiant heat loss compared with the combustion heat load. The fact means that a key factor for realizing this process should be to reduce the radiant heat loss compared with the combustion heat load. The fact means that a key factor for realizing should be to reduce the radiant heat loss from slabs and maintain temperature. Less

多孔的陶瓷表面燃烧器，其中沿着多孔陶瓷板上的表面形成火焰，在等效比的较大区域中具有火焰限制。如果在相当富含燃料的当量比率下可以在高温下进行甲烷 - 氧混合物的组合，则可以将二氧化硅转化为碳化硅。在本研究中，提出了表面燃烧器与碳化硅合成合成的应用，并获得了以下知识的可能性：1）通过使用陶瓷蜂窝组装表面燃烧器，从火焰耐药性极限的测试中观察到了表面燃烧器。 2）燃烧器富含燃料的组合在同等比率上达到3.0，但烟灰产生变得很大。 3）蜂窝表面上附着在蜂窝表面上的薄火焰比1.5较小，而在蜂窝表面附着在蜂窝表面上的长度的等效比小于1.5 w…更多的hile，随着等效比的升高，火焰的长度增加了，超过1.5。 4）基于与31种的基本反应分析了化学反应动力学模型。分析结果表明，组成和温度满足了二氧化硅在高于2.0的较高的二氧化碳中所需的条件。 5）检查了一块石英玻璃，以合成燃烧燃烧器燃料富含火焰的平板上的碳化​​硅胶片。但是，与压缩热载荷相比，由于样品无法保持反应所需的反应所需的足够高温，因此未通过XRD分析检测到产生。事实意味着，与压缩热负荷相比，实现此过程的关键因素应该是减少辐射热损失。事实意味着，意识到的关键因素应该是减少板的辐射热量损失并保持温度。较少的