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

(1)CO_2是全球气候变暖的主要原因，为了减少CO_2的排放，人们提出了燃烧的新概念。碳凝固燃烧（CSC）是指通过控制燃烧来回收固相中的碳并利用剩余能量。对CSC背景的讨论表明，CSC有可能成为未来几十年的合理对策之一。此外，定量比较的净能量在CSC和干冰制造（和它的抛弃到海里）表明，两者是相互竞争的。(2)通过应用辐射转换器强化燃烧技术，验证了技术可行性。结果，对于预混甲烷燃烧，可燃极限大大扩展到当量比3.5，并且燃料中包含的约20%的碳成功地固化为烟灰。(3)在0.9- 4.0 μ m范围内研究了煤烟形成过程中辐射的光谱分布。不发光火焰的辐射是带谱的，发光火焰的辐射是连续的，由分子辐射和烟尘等组成。(4)对这种火焰进行了分析。特别注意烟尘的形成和辐射条款。通过结合Tesner等人开发的碳烟形成速率模型进行了数值计算。(5)电场的作用。（最大强度约为1 kV/cm）对发光火焰的影响。(6)一种计算机层析成像方法被应用到测量的烟尘浓度。它已被证明，计算出的烟尘浓度是定性正确的各种测试情况下，具有简单的几何形状。

(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.