转炉烟气湿法净化系统性能计算及文氏管流动与传热数值仿真

发布时间：2018-02-21 09:28

本文关键词： 炉气净化仿真文氏管　出处：《北京化工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国能源、环境和资源问题日益突出,作为钢铁行业的节能减排工作任务艰巨。由于历史和现实原因,我国钢铁行业转炉烟气净化大多数仍然采用湿法工艺。对于转炉烟气湿法净化工艺,其系统性能受到较多因素的影响。本文将针对某企业二级文氏管湿法净化系统,主要完成了如下工作：(1)构建包括冷却烟道、第一文氏管、第一弯头、第二文氏管、第二弯头及风机的热工计算关系式；(2)对文氏管阻力系数与文氏管几何结构参数、运行参数等关系进行了曲线回归,以便于计算程序的编制；(3)在C++平台上,编制了计算程序的编制,实现湿法净化系统热工快速计算,并给出了150吨转炉烟气湿法净化系统的热工计算实例,分析了文氏管喉口开度对压降、喉口速度和除尘效率的影响规律；(4)针对第一文氏管,构建了包括质量、动量、能量、组分守恒方程.基于连续相和离散相耦合作用,考虑高温烟气与喷淋液滴的传热传质,在Fluent平台上对文氏管内的流动和传热过程进行了数值模拟,获得了文氏管内部速度、压力、温度和水蒸气的分布规律,数值模拟结果与开发的计算软件的计算结果进行了对比,二者具有较好吻合度。转炉烟气湿法净化系统性能计算软件的开发,可以克服手工计算时文氏管能量平衡的反复迭代,以实现快速计算,为现场操作人员进行操作提供了方向性指导。基于计算流体力学与传热数值模拟,有助于人们深入理解文氏管内部的流动与传热过程,为提高文氏管除尘效率和降低阻力损失提供理论基础。
[Abstract]:With the problems of energy, environment and resources becoming more and more prominent in China, the task of energy saving and emission reduction in steel industry is arduous. Most converter flue gas purification in iron and steel industry in China still adopts wet process. The system performance of converter flue gas purification process is affected by many factors. The main work is as follows: 1) Construction includes cooling flue, first Venturi pipe, first bend, second Venturi tube, second bend and blower. In order to facilitate the compilation of calculation program on C platform, the calculation program is compiled to realize the rapid calculation of thermal engineering in wet purification system. An example of thermal calculation of 150 ton converter flue gas purification system is given. The influence of throat opening on pressure drop, throat velocity and dust removal efficiency is analyzed. 4) for the first Venturi tube, the mass, momentum and energy are constructed. Component conservation equation. Based on the coupling of continuous phase and discrete phase, considering the heat and mass transfer between high temperature flue gas and spray droplet, the flow and heat transfer process in Venturi tube was numerically simulated on Fluent platform, and the internal velocity of Venturi tube was obtained. The distribution of pressure, temperature and water vapor, the numerical simulation results are compared with the calculated results of the developed calculation software. It can overcome repeated iterations of energy balance of Venturi tube in manual calculation to realize rapid calculation and provide directional guidance for field operators. Based on numerical simulation of computational fluid dynamics and heat transfer, It is helpful for people to understand the flow and heat transfer process in Venturi tube and to provide a theoretical basis for improving the dust removal efficiency and reducing the resistance loss of Venturi tube.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X757

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