Zhang Chong, Zhang Zhongnong, Lou Chun
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Yantai Longyuan Power Technology Co., Ltd., Yantai 264006, China.
Materials (Basel). 2023 Jan 13;16(2):799. doi: 10.3390/ma16020799.
In this paper, a three-dimensional (3-D) high-temperature furnace filled with a gas-solid medium was investigated, and the radiative transfer equation and the radiative entropy transfer equation in the chamber were applied in order to analyze the effect of coal deposits on thermal radiation. The heat flux on the walls of the furnace and the entropy generation rate were determined due to the irreversibility of the radiative heat transfer process in the furnace. Furthermore, the effect of ash deposits on the wall surface on the irreversibility of the radiation heat transfer process was investigated. The numerical results show that when burning bituminous and sub-bituminous coal, ash deposits in the furnace led to a 48.2% and 63.2% decrease in wall radiative heat flux and a 9.1% and 12.4% decrease in the radiative entropy rate, respectively. The ash deposits also led to an increase in the entropy generation number and a decrease in the thermodynamic efficiency of the radiative heat transfer process in the furnace.
本文对一个填充气固介质的三维高温炉进行了研究，应用炉腔内的辐射传递方程和辐射熵传递方程来分析积灰对热辐射的影响。由于炉内辐射传热过程的不可逆性，确定了炉壁上的热流和熵产生率。此外，还研究了壁面灰沉积对辐射传热过程不可逆性的影响。数值结果表明，燃烧烟煤和次烟煤时，炉内积灰分别导致壁面辐射热流降低48.2%和63.2%，辐射熵率降低9.1%和12.4%。积灰还导致熵产生数增加，炉内辐射传热过程的热力学效率降低。
