高温陶瓷过滤器的设计与数值模拟研究

发布时间：2018-07-09 22:19

  本文选题：高温烟气过滤 + 陶瓷过滤器　； 参考：《华北电力大学》2015年硕士论文

【摘要】：先进发电系统以及清洁煤技术,特别是先进发电系统,如整体煤气化联合循环发电系统(IGCC)和增压流化床燃烧技术(PFBC)等,需要在高温条件下有效地去除颗粒物,以保护下游涡轮机和满足日趋严格的排放标准,因此高温气体过滤已经成为了这些系统中的一个基本组成部分。同时,由于冶金行业PM2.5细颗粒物排放量大、腐蚀性强、传统除尘工艺净化率低等特点,也急需发展高温烟气过滤深度净化技术。陶瓷过滤器作为最具有发展潜力的高温烟气过滤设备,可用于清除烟气中5μm以下的超细颗粒,且过滤效率可达99%以上,在化工、炼油、焚化、金属冶炼、金属回收工业以及先进发电系统中具有广泛的应用前景。陶瓷过滤器作为高温烟气过滤系统中最主要的设备,当含尘气体进入过滤器内,通过截留捕捉、惯性碰撞捕捉以及扩散捕捉等过程,实现粉尘颗粒与气体的高效分离。为了延长陶瓷滤芯的使用寿命,同时保证过滤系统的正常运行,需要对滤芯进行清灰并使滤芯再生。和静电除尘及布袋除尘相比,其过程更为复杂,因此针对多种影响因素开展系统研究和设计至关重要。本文针对陶瓷过滤器的除尘和清灰再生过程,通过壁厚计算、热力计算等,设计了一台具有100m3/h处理能力,工作压力为5kPa,工作温度为550℃,并安装有四根烛状陶瓷滤芯的陶瓷过滤系统,主要由进气系统、净化系统、反吹清灰系统三大部分构成。同时利用Geometry和Pro/Engineer软件建立了陶瓷过滤器的三维模型,利用ICEM划分网格,导入Fluent软件,进行了数值计算。数值模拟过程中选择Realizable k-e模型,将陶瓷过滤滤芯多孔介质部分设置为porous-jump壁面条件,其表面渗透率设定为5.5×10-1 2m2,对不同进气速度、进气方式、过滤器内压力和温度进行了模拟,根据多次模拟计算结果,揭示了进气管内气流分布的规律,并据此优化了进气管的设计;通过对滤芯内外压力以及气流速度的模拟结果的分析,并基于对过滤器内部气流流动状态的研究,得到速度场和压力场对陶瓷滤芯除尘过程的影响规律;通过对800K(526.85℃)入口气流温度条件下,过滤器内及滤芯内外温度分布模拟结果的分析,得到温度场对陶瓷过滤器除尘过程的影响规律。本文研究结果为陶瓷过滤器的实际应用与优化设计提供了有益的参考。
[Abstract]:Advanced power generation systems and clean coal technologies, especially advanced power generation systems, such as integrated coal gasification combined cycle power generation (IGCC) and pressurized fluidized bed combustion (PFBC), require the effective removal of particulate matter at high temperatures. To protect downstream turbines and meet increasingly stringent emission standards, high temperature gas filtration has become an essential part of these systems. At the same time, due to the characteristics of high emission of PM2.5 fine particles in metallurgical industry, strong corrosion and low purification rate of traditional dust removal process, it is urgent to develop the technology of high temperature flue gas filtration and deep purification. As the most promising high-temperature flue gas filtration equipment, ceramic filter can be used to remove ultrafine particles below 5 渭 m in flue gas, and the filtration efficiency can reach more than 99%. It can be used in chemical industry, refining, incineration and metal smelting. Metal recovery industry and advanced power generation systems have a wide range of applications. Ceramic filter is the most important equipment in high temperature flue gas filtration system. When the dust gas enters into the filter, the separation of dust particles and gas can be realized through the processes of retention and capture, inertial collision capture and diffusion capture. In order to prolong the service life of the ceramic filter and ensure the normal operation of the filter system, it is necessary to clean the dust and regenerate the filter. Compared with electrostatic dust removal and cloth bag dust removal, the process is more complex, so it is very important to carry out systematic research and design for a variety of influencing factors. In this paper, according to the process of dust removal and ash removal and regeneration of ceramic filter, through wall thickness calculation, thermodynamic calculation and so on, a 100m3/h treatment machine is designed. The working pressure is 5 KPA and the working temperature is 550 鈩，

本文编号：2110883