Numerical simulation of radiative heat transfer of high temperature and high pressure syngas based on wide bank k-distribution model

This study focused on the calculation of gas radiation in a high-temperature heat recovery equipment for high temperature and high pressure syngas in coal polygeneration system. The spectral characteristic parameters of each component of the syngas were obtained from the high temperature gas database HITEMP and HITRAN.A new wide band k-distribution (WBK) model was used to calculate the coefficient of absorption under different temperature and pressure, and the results were interpolated to a polynomial function of temperature in order to calculate radiative heat transfer in the condition of non-isothermal and radiation equilibrium. Numerical results of three 1-D gas radiation heat transfer test examples indicate that the error of the radiative heat flux distribution obtained by the WBK model is about 15% based on the line-by-line results, which is much lower than the error of full spectral k-distribution. However, the time consumption of the WBK model is only 0.02% of the line-by-line model. Hence it is applicable for engineering calculation and is an optimal model considering both the accuracy and time consumption. © 2013 Chinese Society for Electrical Engineering.