年产40万吨超细固硫灰的过热蒸汽袋式除尘器设计与研究
发布时间：2019-05-14 15:42
【摘要】：随着超细粉碎技术的不断发展,蒸汽动能磨为固硫灰渣的无害化和资源再利用化提供了一条新工艺。过热蒸汽袋式除尘器作为该系统的重要部分,其设计缺乏明确的理论或标准作指导。本文以年产40万吨蒸汽动能磨制备超细固硫灰的生产工艺为工程背景,旨在解决过热蒸汽袋式除尘器工艺结构、清灰、耐温抗结露设计问题。首先对蒸汽动能磨系统的生产工艺进行研究,采用公式法、经验法、类比法对除尘器的各工艺参数进行设计,建立除尘器结构模型。通过脉冲清灰实验和工业实验,建立了清灰强度对清灰效果及滤袋寿命的影响规律,得到氟美斯滤袋的有效清灰强度范围:沿长度方向的平均最大侧壁压力峰值为876Pa的强度能满足高温除尘器的清灰要求;超过2713Pa,清灰效果仅轻微提高;当局部侧壁压力峰值超过5282Pa时,滤袋破损。在此范围内,本系统的清灰压力宜选择0.2MPa,喷吹距离宜选择200mm。利用CFD软件对除尘器内部流场进行数值模拟,探究传热系数、蒸汽参数及漏风对其温度场的影响规律。结果表明:减小传热系数能有效提高并均化除尘器内部温度场,当传热系数低于0.4W/(m2·K)时,除尘器内部流场温升很小;入口过热蒸汽温度与滤袋温度分布呈近似线性关系,为避免“烧袋”和结露,宜控制在130~220℃范围内;同时,1分室上部处于低温区域,漏风更易引起结露。根据过热蒸汽袋式除尘器工艺特点和以上数值模拟结果提出耐温抗结露措施,并针对各具体措施涉及的材料、设备选型、安装等问题进行了分析和研究。最终完成了整个过热蒸汽袋式除尘器的主要设计。以上工作为今后袋式除尘器在大型化、超细粉体收集、高温、高湿等苛刻条件的工业设计与应用提供了参考,具有重要的意义。
[Abstract]:With the continuous development of ultra-fine grinding technology, steam kinetic energy grinding provides a new process for innocuous sulfur fixation slag and resource reuse. As an important part of the system, the design of superheated steam bag dust collector lacks clear theory or standard. In this paper, the production process of ultra-fine sulfur fixation ash with an annual output of 400000 tons of steam kinetic energy mill is taken as the engineering background, in order to solve the design problems of superheated steam bag dust collector process structure, ash cleaning, temperature resistance and condensation resistance. Firstly, the production process of steam kinetic energy grinding system is studied. The formula method, empirical method and analogy method are used to design the process parameters of the dust collector, and the structure model of the dust collector is established. Through pulse ash cleaning experiment and industrial experiment, the influence of ash cleaning strength on ash cleaning effect and filter bag life was established. The effective ash cleaning strength range of flumis filter bag is obtained: the average maximum side wall pressure peak value along the length direction is 876Pa, which can meet the ash removal requirements of high temperature dust collector; When the peak pressure of the local side wall exceeds 5282Pa, the filter bag is damaged when the ash removal effect is only slightly improved when the peak pressure of the local side wall is more than 2713 Pa. In this range, the ash cleaning pressure of the system should be 0.2 MPA, and the injection distance should be 200 mm. The flow field in the dust collector is simulated by CFD software, and the effects of heat transfer coefficient, steam parameters and air leakage on the temperature field are investigated. The results show that reducing the heat transfer coefficient can effectively improve and homogenize the internal temperature field of the dust remover. When the heat transfer coefficient is lower than 0.4W/ (m ~ 2 路K), the temperature rise of the flow field in the dust collector is very small. There is an approximate linear relationship between the inlet superheated steam temperature and the temperature distribution of the filter bag. In order to avoid "burning bag" and condensation, it should be controlled in the range of 130 鈩，
本文编号：2476830
[Abstract]:With the continuous development of ultra-fine grinding technology, steam kinetic energy grinding provides a new process for innocuous sulfur fixation slag and resource reuse. As an important part of the system, the design of superheated steam bag dust collector lacks clear theory or standard. In this paper, the production process of ultra-fine sulfur fixation ash with an annual output of 400000 tons of steam kinetic energy mill is taken as the engineering background, in order to solve the design problems of superheated steam bag dust collector process structure, ash cleaning, temperature resistance and condensation resistance. Firstly, the production process of steam kinetic energy grinding system is studied. The formula method, empirical method and analogy method are used to design the process parameters of the dust collector, and the structure model of the dust collector is established. Through pulse ash cleaning experiment and industrial experiment, the influence of ash cleaning strength on ash cleaning effect and filter bag life was established. The effective ash cleaning strength range of flumis filter bag is obtained: the average maximum side wall pressure peak value along the length direction is 876Pa, which can meet the ash removal requirements of high temperature dust collector; When the peak pressure of the local side wall exceeds 5282Pa, the filter bag is damaged when the ash removal effect is only slightly improved when the peak pressure of the local side wall is more than 2713 Pa. In this range, the ash cleaning pressure of the system should be 0.2 MPA, and the injection distance should be 200 mm. The flow field in the dust collector is simulated by CFD software, and the effects of heat transfer coefficient, steam parameters and air leakage on the temperature field are investigated. The results show that reducing the heat transfer coefficient can effectively improve and homogenize the internal temperature field of the dust remover. When the heat transfer coefficient is lower than 0.4W/ (m ~ 2 路K), the temperature rise of the flow field in the dust collector is very small. There is an approximate linear relationship between the inlet superheated steam temperature and the temperature distribution of the filter bag. In order to avoid "burning bag" and condensation, it should be controlled in the range of 130 鈩，
本文编号：2476830
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