文献类型：期刊文献

英文题名：Modeling and comparison of different syngas cooling types for entrained-flow gasifier

作者：Ni, Jianjun[1];Yu, Guangsuo[1];Guo, Qinghua[1];Dai, Zhenghua[1];Wang, Fuchen[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Coal Gasificat, Shanghai 200237, Peoples R China

年份：2011

卷号：66

期号：3

起止页码：448

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20110113543395);WOS:【SCI-EXPANDED(收录号:WOS:000285777400023)】；

基金：This work is financially supported by National Key State Basic Research Development Program of China (973 Program, 2010CB227006), and National Nature Science Foundation of China (20876048).

语种：英文

外文关键词：Syngas cooler; Energy utilization; Heat transfer; Turbulence; Multiphase flow; Entrained-flow gasifier

摘要：A three-dimensional numerical model has been developed for studying the multi phase flow and heat transfer process in the syngas cooler. Therealizable k-epsilon turbulent model and discrete random walk (DRW) model were adopted to simulate the gas phase and particle phase flow fields, respectively. The discrete ordinate model (DOM) was applied to solve the radiative heat transfer equation, and the gas radiative properties were calculated by weight-sum-of-gray-gases model (WSGGM). The ash particle radiative properties were also considered in the radiative heat transfer calculation. The convection heat transfer between the gas phase and discrete phase is also considered. The flow field and temperature distribution results are in good agreement with the experimental data. Firstly, the results indicate that the RSC should be the better choice for integrated gasification combined cycle (IGCC) power plant. For cooling-syngas quenching cooler, the outlet region has higher risk of fouling and slagging because the outlet gas and particle temperature are about 940 degrees C, and exceed the criteria temperature 760 degrees C (suggested in the literature). Secondly, when the inlet velocity and flow rate of the quenching gas are fixed, the more the quenching gas inlets are, the better the flow field and temperature field are. A recirculation region with the diameter about 1.5-2.0 m is formed in the center of the cooler under the quenching gas profile, and the intensity of the reflux flow increases with the number of quenching gas inlets. The particles are rapidly quenched when the particle flow through the quenching gas profile. Furthermore, the temperature of the quenching gas, and the temperature of the water in the tubes of membrane wall also have important effect on the temperature field in the RSC. (C) 2010 Elsevier Ltd. All rights reserved.