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Development of Liquid Fuel Combustion by Relaxation of Phase Change in Liquid-Vapor

通过缓和液-汽相变发展液体燃料燃烧

基本信息

批准号：
13650810
负责人：
KOBAYASHI Noriyuki
金额：
$ 2.18万
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：
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/grant/KAKENHI-PROJECT-13650810/
关键词：
Hot Water Supplier Conservation of Electric Energy Radiation Heat Reflux Turn Down Ratio Relaxation of Phase Change in Liquid-Vapor 灯油給湯器

项目摘要

In oil vaporizing boiler as an energy device for home use, the vaporizing combustor has a demerit that much consumption of electric energy is required for pre-heating of fuel vaporizer in order to prepare the hot water supply instantaneously. It is required for improvement of the cost advantage that the consumption of the electric energy is reduced on fuel vaporizer. In the previous work, it was reported that a kerosene vaporizing heating could be mitigated during the stable combustion state because the kerosene vaporization was sustained to enhance the heat reflux of radiation of the flame and high temperature furnace with higher porous ceramic plate burner. On the other hand, the problem in large consumption of the electric energy has not been solved yet at the ignition and start up state. To meet the techniques of requirement above, we proposed the kerosene ignition device with ultrasonic atomizing burner. But fundamental combustion characteristics of ultrasonic atomizing burner had … More been little researched.To develop the new liquid fuel combustion process, which is a quick phase change in liquid fuel atomized with high frequency ultrasonic oscillator, through an instantaneous mixing with air. In this work, we manufactured ultrasonic atomizing premixed burner and the ignition characteristics was investigated. As other characteristics of this ultrasonic combustor, the stable combustion range and NOx emission were examined with considering the combustion air supply. We have clarified research results as shown below.1) Kerosene droplets had several micron diameter and sharp size distribution caused by ultrasonic atomizing method. Accordingly, ultrasonic atomizing method is effective for instantaneous ignition of kerosene.2) The stable combustion region of ultrasonic atomizing burner was decision by the balance between primary and secondary air flow rate.3) Compared with conventional models, NOx emission could be extremely reduced because of diffusion of the high temperature zone in the flame with appropriate air supply Less

在燃油汽化锅炉作为家用能源装置中，汽化燃烧器的缺点是需要消耗大量的电能来对燃油汽化器进行预热，以准备即时的热水供应。为了提高成本优势，需要减少燃料汽化器的电能消耗。在之前的工作中，报道了在稳定燃烧状态下煤油汽化加热可以得到缓解，因为煤油汽化持续以增强火焰辐射的热回流，并且具有较高多孔陶瓷板燃烧器的高温炉。另一方面，点火启动状态下电能消耗大的问题尚未解决。为了满足上述技术要求，我们提出了带有超声波雾化燃烧器的煤油点火装置。但对超声波雾化燃烧器的基本燃烧特性研究甚少。开发新的液体燃料燃烧过程，即液体燃料经高频超声波振荡器雾化，与空气瞬时混合，发生快速相变。在这项工作中，我们制造了超声波雾化预混燃烧器并研究了点火特性。作为该超声波燃烧器的其他特性，在考虑燃烧空气供应的情况下检查了稳定燃烧范围和NOx排放量。我们的研究结果如下： 1）超声波雾化法产生的煤油液滴具有几微米的直径和尖锐的尺寸分布。因此，超声波雾化方法对于煤油的瞬时点燃是有效的。2）超声波雾化燃烧器的稳定燃烧区域是由一次和二次空气流量的平衡决定的。3）与传统模型相比，由于适当的供气量，火焰中高温区的扩散可以大大减少NOx的排放。