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| 1 | Effect of Thermal Radiation Heat Transfer on the Temperature Measurement by the Thermocouple in Premixed Laminar Flames显示文摘In the past 30 years,the effect of thermal radiation and convection heat transfer,which are predominant at high temperature and can affect the measurement accuracy of thermocouple,were not fully considered in the field of laminar flame researches.In this work,the effect of thermal radiation heat transfer was newly calculated by determining the spectral irradiation heat flux from the whole space to thermocouple and the radiation heat loss from thermocouple junction to surroundings.Analysis reveals that the thermocouple itself maintains at high temperature,resulting serious thermal radiation heat loss,which can be compensated via receiving energy from convection-transferred heat as well as thermal radiation emitted by flame and burner surface.Such method was applied to correct the temperatures measured by thermocouple in rich nitromethane flame as reference.The results indicate that the radiation heat loss plays a dominant role,while the radiations emitted by flame and burner surface account for minor contribution with the percentage of 20.78%at the height above burner(HAB)of 0.4 mm,3.63%at HAB of 2.0 mm and even smaller at higher HAB.Temperature correction states that the maximum temperature error is 117.60 K,where the effect of thermal radiation emitted by flame and burner surface is less than 1.75 K.Consequently,it is provably reasonable and feasible to concentrate on the radiation heat loss and ignore the effect of thermal radiation emitted by flame and burner in real combustion processes. | JIN Kairu TIAN Zhenyu | 2022 | Journal of Thermal Science2022，31，2： | 2 |
| 2 | 烟煤/半焦在循环流化床内混燃时的NO排放特性研究显示文摘采用电加热循环流化床实验台研究烟煤/半焦混合燃料的NO排放特性,同时为了加深理解,对燃料中N的分布及赋存形式也进行了分析。研究结果表明,神华烟煤中挥发分N和焦炭N的占比分别为53.85%和46.15%,而半焦以焦炭N为主。在燃烧过程中,挥发分N快速析出,并且容易在密相区还原,而焦炭N释放较慢,因而半焦的NO排放明显高于烟煤。在半焦中掺烧烟煤,NO排放量会随其掺烧比的增加而减少,并且燃料之间的交互作用对NO的排放也能起到抑制作用。半焦和烟煤的NO排放量随燃烧温度呈现不同的变化趋势,当半焦中掺烧40%和80%的烟煤时,其排放量随燃烧温度升高而增加。另外,烟煤、半焦及混合燃料的NO排放量随过量空气系数和一次风率的升高也会增加。 | 刘炎泉 郭鹏鹏 谭文轶 梁绍华 潘效军 | 2022 | 燃料化学学报2022，50，9： | 0 |
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