Premixed Combustion of Low Volatile Liquid Fuel by Air Bubble Blowing

低挥发性液体燃料鼓泡预混燃烧

• 批准号: 10650196
• 负责人: KITANO Michio
• 金额: $ 0.9万
• 依托单位: IWATE 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-10650196/
• 关键词: Liquid Fuel; Premixed Combustion; Air Bubble Blowing; Bubble Layer; Heat Feedback; 液体燃料; 予混合燃焼

We previously proposed a new method for premixed combustion of liquid fuel using air bubble blowing. In the present study, this method was applied to heavy oil, which has high boiling temperature and high viscosity. Ceramic foam plate was set in the downstream of the bubble layer not only to hold the flame on it but also to actively feedback the heat released at the flame front toward the upstream side and to promote the evaporation of low volatile liquid fuel. Effects of parameters, such as thickness and porosity of the flame holder (ceramic foam plate), preheat of the fuel, air and fuel supply rate (equivalence ratio) , on the combustion state and the emission characteristics of CO, C0ィイD22ィエD2 and UHC were examined and the following results were obtained.(1)Thickness and porosity of the flame holder have small effects on the combustion state. Thick flame holder with low porosity is favorable to the flow rectification and the heat feedback, but it promotes fuel pyrolysis and therefor … More e deposit formation inside the plate which leads to blocking the mixture flow after a long time use.(2)When the low volatile fuel is used, fuel supply to the flame holder is done mainly by the small flying fuel particles produced by the collapse of bubbles and secondarily by the fuel vapor, therefore the flame holder functions as the vaporizer of these small particles.(3)For a high viscous fuel like heavy oil, fuel preheating is necessary to decrease its viscosity and keep the fuel mobility inside the flame holder, which leads to an increase in the flame stability. Fuel preheating is also effective for promoting fuel evaporation.(4)Uniform red-hot combustion state is obtained over a fairly wide range of air flow rate (I.e., combustion load) , and depending on the air flow rate steady combustion region extends toward the lean side till the equivalence ratio near to 0.5, indicating the promotion of combustion by the heat feedback.(5)Concerning the emission characteristics, suppression of CO/C0ィイD22ィエD2 to a low level is possible in the lean side and suppression of UHC to the level which clears the indoor concentration regulation is realized over the wide range of combustion load. Less

我们以前提出了一种新的方法，用于预混燃烧的液体燃料使用气泡吹。本研究将该方法应用于高沸点、高粘度的稠油。泡沫陶瓷板设置在气泡层的下游，不仅保持其上的火焰，而且主动反馈的热量释放在火焰的前端向上游侧，并促进低挥发性液体燃料的蒸发。研究了泡沫陶瓷保持器的厚度和孔隙率、燃料预热、空气和燃料供给率（当量比）等参数对燃烧状态和CO、CO_0、D_22、D_2和UHC排放特性的影响。（1）火焰保持器的厚度和孔隙率对燃烧状态的影响很小。低孔隙率的厚火焰保持器有利于流动整流和热反馈，但会促进燃料热解， ...更多信息 e.在板内形成存款，这导致在长时间使用后阻塞混合物流动。（2）当使用低挥发性燃料时，向火焰保持器的燃料供给主要由气泡破裂产生的小的飞行燃料颗粒完成，其次由燃料蒸汽完成，因此火焰保持器用作这些小颗粒的蒸发器。（3）对于重油等高粘度燃料，需要进行燃料预热以降低其粘度并保持燃料在火焰保持器内的流动性，这导致火焰稳定性的增加。燃料预热对于促进燃料蒸发也是有效的。（4）在相当宽的空气流量范围内获得均匀的红热燃烧状态（即，随着空气流量的增加，稳定燃烧区向稀燃侧延伸，直至当量比接近0.5，表明热反馈促进了燃烧。（5）关于排放特性，在稀燃侧可以将CO/C 0的D22的D22抑制到低水平，并且在宽的燃烧负荷范围内实现将UHC抑制到清除室内浓度调节的水平。少