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Experimental Study on the Characteristics of High Temperature Flames stabilized by the Heat Recirculating Burner

热循环燃烧器稳定高温火焰特性的实验研究

基本信息

批准号：
60550149
负责人：
KAWAMURA Takeshi
金额：
$ 1.02万
依托单位：
Gifu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550149/
关键词：
Energy saving Fossil fuel Combustion Energy conversion device Heat recirculating burner Heat 熱エネルギエクセルギ

项目摘要

Higher temperature flames compared with normal adiabatic temperature flames can be stabilized by means of a heat recirculating burner(HR burner), which is equipped with an opposing-flow type heat exchanger having three concentric circular tubes. The high temperature flames stabilized by the HR burner may become a heat source better than those by a no heat-recirculating burner(NHR burner), and may supply high quality heat for a hot reservoir of an energy conversion device, here, it has Carnot's cycle.The characteristics of the flames stabilized by the HR burner were survayed. The thermal energy and the exergy supplied from the HR burner were examined comparing with those supplied from the NHR burner. As a means to obtain the exergy from combustion gases, there are two processes ; one of them is that the combustion gases regard as an external heat source for the hot reservoir of the energy conversion device (external combustion process), and other that the combustion gases themselves regard as the hot reservoir of the device, namely, the combustion gases become a internal heat source of the device (internal combustion process).The conclusions obtained are as follows: 1.More heat flux and more exergy flux are provided by the HR burner than by the NHR burner, in spite of lower equivalence ratio for the former. 2.More exergy flux are provided by the internal combustion process than by the external combustion process. This fact is observed commonly in both burners under the condition of the same heat flux. 3.In order to promote heat transfer from combustion gases to the working fluid of the energy conversion device, high temperature flames must be stabilized near the opposite side of the wall in contact with the working fluid. Considering from such a viewpoint, the flames obtained by the HR burner is highly efficient.

与正常绝热温度火焰相比，更高温度的火焰可以通过热再循环燃烧器（HR燃烧器）来稳定，该热再循环燃烧器配备有具有三个同心圆形管的逆流型热交换器。由HR燃烧器稳定的高温火焰可以成为比无热循环燃烧器（NHR燃烧器）更好的热源，并为能量转换装置的热库提供高质量的热量，这里它具有卡诺循环。对HR燃烧器和NHR燃烧器提供的热能和火用进行了比较。作为从燃烧气体中获得火用的一种手段，有两个过程：其中之一是将燃烧气体作为能量转换装置的热储存器的外部热源（外部燃烧过程），以及燃烧气体本身视为装置的热储存器的其它过程，即，燃烧气体变成装置的内部热源（内燃过程）。得到的结论如下：1.与NHR燃烧器相比，HR燃烧器虽然当量比较低，但其提供的热通量和火用通量较大。2.内燃烧过程比外燃烧过程提供更多的火用通量。在相同热通量的条件下，这一事实在两个燃烧器中普遍观察到。3.为了促进从燃烧气体到能量转换装置的工作流体的热传递，高温火焰必须在与工作流体接触的壁的相对侧附近稳定。从这样的观点考虑，HR燃烧器获得的火焰是高效的。