CAJ | 학술논문

GSP气化炉是国内最近引进的西门子公司开发的粉煤气化技术，由于对其炉膛内气固反应流动特性认识不足，运行中出现耐火砖烧穿、合成气含灰过高等问题。利用数值模拟方法，采用双组分 PDF 模型耦合湍流-化学反应、随机轨道法耦合湍流-颗粒运动，针对GSP气化炉内多相反应流场建立三维数值模型。计算结果与实验值及文献计算结果一致，表明该模型可用于GSP气化炉的模拟计算。研究发现，炉膛内流场主要分为旋转射流区、内回流区、外回流区和管流区。高温区位于发生氧化反应的旋转射流区和内回流区上部，而外回流区和管流区主要发生还原反应，温度较为均匀；炉膛高度1/3位置处为高温火焰直接冲刷处，在运行时需重点考虑该位置的热防护。
GSP기화로시국내최근인진적서문자공사개발적분매기화기술，유우대기로당내기고반응류동특성인식불족，운행중출현내화전소천、합성기함회과고등문제。이용수치모의방법，채용쌍조분 PDF 모형우합단류-화학반응、수궤궤도법우합단류-과립운동，침대GSP기화로내다상반응류장건립삼유수치모형。계산결과여실험치급문헌계산결과일치，표명해모형가용우GSP기화로적모의계산。연구발현，로당내류장주요분위선전사류구、내회류구、외회류구화관류구。고온구위우발생양화반응적선전사류구화내회류구상부，이외회류구화관류구주요발생환원반응，온도교위균균；로당고도1/3위치처위고온화염직접충쇄처，재운행시수중점고필해위치적열방호。
A comprehensive three dimensional numerical model has been developed for the GSP gasifier. Based on the assumption of chemical equilibrium, two mixture fractions,ffuel and psec, are used to describe the thermochemistry of the gasifier. Probability density function (PDF) is used to describe the coupling of turbulence-chemistry. Stochastic tracking technique is selected to describe the interaction of turbulence and particle motion. The predictions are in good agreement with experimental data and literature, proving the reliability of the model. The flow field of GSP gasifier can be divided into four regions: swirling jet region, internal recirculation region, external recirculation region and plug flow region. Oxidation reactions are mainly conducted in swirling jet region and internal recirculation region. Gasification reactions dominate the other regions. The high temperature flame impinge directly on the chamber wall of the 1/3 height of the gasifier, so more consideration should be taken on the protection of the refractory at that position.