A Study on Radiation-Controlled Combustion Process for Guiding a Carbon Solidification

(1)提出了燃烧的新概念，以减少被认为是全球变暖的主要原因的CO_2排放。碳素固化燃烧(CSC)是指控制燃烧过程，回收固相碳，利用剩余能量。对CSC背景的讨论表明，CSC有潜力在未来几十年内采取合理的对策之一。此外，CSC中可利用的净能量与干冰制造中的净能量(以及干冰被丢弃入海中)的定量比较表明，两者是相互竞争的。(2)研究了辐射换热器强化燃烧的技术可行性。结果表明，对于预混甲烷燃烧，可燃极限大大扩展到当量比3.5，燃料中约20%的碳被成功固化为碳烟。(3)研究了烟尘形成过程中辐射在0.9-4.0微米范围内的光谱分布。非发光火焰的发射是带状光谱，而发光火焰的发射是连续的，由分子发射和烟尘等组成。(4)对火焰进行了分析。特别注意了烟尘形成和辐射条件。结合Tesner等人建立的碳烟生成速率模型进行了数值计算。(5)电场效应。(最大强度约为1千伏/厘米)对发光火焰进行了研究。(6)将计算机层析成像方法应用于烟尘浓度的测量。已经证明，对于具有简单几何结构的各种测试用例，计算的碳烟浓度是定性正确的。

(1) A new concept on combustion has been proposed to reduce the emission of CO_2 which is considered to be the principal cause of the global warming. It was termed as the Carbon solidification Combustion (CSC), which controls the combustion to recover the carbon in solid phase and to utilize the residual energy. Discussion on the background of the CSC demonstrated that the CSC has the potential for one of the reasonable countermeasures for a subsquint few decades. Furthermore, quantitative comparison of the net energy available in the CSC with that in dry ice fabrication (and its abandon into the sea) showed that the both are competitive each other. (2) The technical feasibility was examined by applying the combustion enhancement with the radiative converter. As a result, for the premixed methane combustion, the flammable limit was largely extended to equivalence ratio 3.5, and about 20% of carbon contained in the fuel was successfully solidified as the soot. (3) The spectral distributions for radiation occurring in the formation of soot have been investigated at 0.9-4.0mum. While emission of nonluminous flame is band spectrum, that of luminous flame is a continuous and consists of molecular emission and soot etc.. (4) An analysis was made on this flame. Special attention was give to soot formation and radiation terms. Numerical calculations were made by incorporating the model for soot formation rate developed by Tesner et al.. (5) The effect of electric fields. ( maximum strength of about 1kV/cm ) on the luminous flame was investigated. (6) A computed tomography method was applied to the measurements of soot concentrations. It has been demonstrated that calculated soot concentrations are qualitatively correct for various test cases having simple geometries.