Experimental and Numerical Study of the Flow Field and Temperature Field for a Large-Scale Radiant Syngas Cooler

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• 作者：Jianjun Ni ; Guangsuo Yu ; Qinghua Guo ; Qinfeng Liang ; Zhijie Zhou
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2010
• 出版时间：May 5, 2010
• 年：2010
• 卷：49
• 期：9
• 页码：4452-4461
• 全文大小：663K
• 年卷期：v.49,no.9(May 5, 2010)
• ISSN：1520-5045

文摘

Experimental and numerical studies on the gas-particle flow field and temperature field in the industrial-scale radiant syngas cooler (RSC) have been carried out. The bench-scale cold model experiment was presented for measuring the gas flow field in the RSC. The accuracy and performance of four turbulent flow models were evaluated according to the comparison of predicted results with experimental results. The ash particle trajectories were predicted by the stochastic Lagrangian model and the interaction between the gas and particle phase was also considered by two-way coupling method. A discrete ordinate model (DOM) was used for solving the radiative heat transfer equation when the radiative properties were calculated by weighted-sum-of-gray-gases model (WSGGM). The Ranz−Marshall correlation for the Nusselt number was used to account for convection heat-transfer between the gas phase and the particle phase. The ash particle radiative heat transfer was also considered. The physical properties of gas mixtures were calculated by the mass-weighted-mixing law. The results indicate that the inlet jet flow intensity is dependent on the inlet diameter, but the length of the jet is independent of the inlet diameter. The thickness of the deposition on the membrane wall has great influence on the heat-transfer. The average temperature profiles of particle are higher than gas in the inner cylinder, and it is inversed in the annular. Furthermore, the results show that particles sizes smaller than 580 μm will be entrained into the annular, but the particle size between 400 and 580 μm cannot be entrained out. And the escaping particle’s temperature is lower than the critical temperature when the deposition thickness is 0.2 mm.