Study on a High-efficiency Combustor using Rotary Heat-strage Regenerator

旋转蓄热蓄热体高效燃烧室的研究

• 批准号: 07558281
• 负责人: NAGASAKI Takao
• 金额: $ 1.66万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07558281/
• 关键词: Combustor; Regenerator; Rotary regenerator; Fuel lean combustion

Characteristics of a high-efficiency burner using a rotary regenerator have been investigated. The burner consists of a heat exchanger (regenerator) and a combustion chamber. The regenerator is a rotary heat-storage-type heat exchanger made by a ceramic honeycomb. The exit port of the regenerator is used as the burner port, and one-dimensional flame is formed close to the honeycomb surface. The burned gas flows out through the regenerator, and the exhaust heat is stored in the ceramics channel wall, which in turn preheats the inlet mixture of city gas and air. The temperature distribution and gas concentration in the combustor were measured. Experiments were made for various fuel-air ratios, and it was found that stable combustion is possible for 0.2<F<6, where F denotes the stoichiometric ratio of the inlet premixed gas, in contrast to the conventional flammable range of 0.5<F<1.8. The effectiveness of the regenerator for the heat reconvery from the exhaust gas was about 90%, which coincides well with the result of a numerical analysis. The temperature of the preheated unburned gas was higher than that of burned gas, which indicates that the heating of honeycomb core by the flame is significant. The measured flame temperature near the fuel-lean flammable limit was significantrly higher than the usual adiabatic flame temperature, which shows that the regenerative heat exchange successfully enlarges the flammable range. The NOx concentration has a maximum value, 8ppm, at F=1.3, and decreases below 1ppm for F<0.7 and F>1.5. Various heat transfer processes, such as the heat exchange in the regenerator, radiative heat transfer from the surface of honeycomb core, etc., were evaluated quantitatively to construct a predictive method for the present combustor. In addition, a thermo-electric module was attached to the combustor wall, and a electric power corresponding to the module performance was extracted.

本文研究了采用回转蓄热器的高效燃烧器的特性。燃烧器由热交换器（蓄热器）和燃烧室组成。回热器是由陶瓷蜂窝制成的旋转蓄热式热交换器。蓄热室出口作为燃烧器口，在蜂窝表面附近形成一维火焰。燃烧后的气体通过回热器流出，废热储存在陶瓷通道壁中，陶瓷通道壁反过来预热城市燃气和空气的入口混合物。测量了燃烧室内的温度分布和气体浓度。在不同的燃料空气比下进行了实验，发现与传统的可燃范围0.5<F<1.8相比，在0.2<F<6的情况下稳定燃烧是可能的，其中F表示入口预混气体的化学计量比。该回热器的排气热回收效率约为90%，这与数值分析的结果吻合得很好。预热后未燃气体的温度高于已燃气体的温度，说明火焰对蜂窝芯体的加热作用显著。实验测得的贫燃极限附近的火焰温度明显高于通常的绝热火焰温度，表明蓄热式热交换成功地扩大了可燃范围。NOx浓度在F=1.3时具有最大值8ppm，并且在F 1.5时降低到1ppm以下<0.7 and F>。各种传热过程，如回热器内的热交换、蜂窝芯表面的辐射传热等，定量评估，以构建一个预测方法，目前的燃烧室。此外，热电模块连接到燃烧室壁，并提取对应于模块性能的电功率。

项目成果

K.Hijikata: "A Study on High-Performance Combustor with Rotating Ceramic Regenerator" Proc.32th National Heat Transfer Conf. (in Japanese). Vol.II. 553-554 (1995)

K.Hijikata：“旋转陶瓷蓄热体高性能燃烧器的研究”，第32届全国传热会议论文集。

Kunio Hijikata: "An Experimental Study on a High-Efficiency Heat Regenerating Burner" Proc.Int.Symp. on Heat Transfer and Energy Conservation. (発表予定). (1997)

Kunio Hijikata：“高效热再生燃烧器的实验研究”Proc.Int.Symp。关于传热和节能（即将发表）。

K.Hijikata: "An Experimental Study on a High-Efficiency Heat-Regenerating Burner" Proc.Int.Symp.on Heat Transfer and Energy Conservation. (to be Presented). (1997)

K.Hijikata：“高效热再生燃烧器的实验研究”Proc.Int.Symp.on 传热和节能。

土方邦夫: "回転蓄熱式再生器を用いた高効率燃焼器の研究" 第32回日本伝熱シンポジウム講演論文集. II. 553-554 (1995)

Kunio Hijikata：“使用旋转蓄热器的高效燃烧器的研究”第32届日本传热研讨会论文集II 553-554（1995）。

Kunio Hijikata: "An Experimental Study on a High-Efficiency Heat-Regenerating Burner" Proc.Int.Symp.on Heat Transfer Enhancement and Energy Conservation. (発表予定). (1997)

Kunio Hijikata：“高效热再生燃烧器的实验研究”Proc.Int.Symp.on 传热增强和节能（待提交）。