新型旋风—过滤除尘器除尘机理及实验研究

发布时间：2018-10-24 22:24

【摘要】：根据煤层气的利用条件,需要对其进行净化,综合分析已经存在的除尘技术及先前研究,结合实际工作下煤层气工况特点,通过将旋风分离器与滤筒式除尘器结合,设计开发了一种新型除尘系统——旋风-过滤除尘系统,详细介绍了其结构原理、性能指标。该新型除尘系统通过离心力和惯性作用,使气流环绕旋风筒的壁面做旋转运动,除去粗大颗粒。在旋风离心力作用下未分离的微细颗粒随着气流到达滤筒位置,被拦截在滤筒的外壁,干净的气流则穿过滤筒,从出气口排出,完成两级分离,并最终排出干净气体。通过加工实验设备,搭建实验平台,本文研究了不同的操作参数对压力损失、除尘效率和清灰效果的影响,最终确定最佳的操作参数。经过实验研究可以得出:除尘系统经过旋风离心力及滤筒过滤两级分离,能够高效分离出细微颗粒,除尘效率可高达99.9967~99.9969%,相比旋风除尘器约高出19个百分点,第一个周期时长2872s,相比滤筒式除尘器延长了502s,旋风-过滤除尘器中的滤筒寿命可有效提高。此外,还研究了空气喷雾对旋风-过滤除尘系统性能参数的影响,得到了适度的喷雾量有利于降低过滤阻力,提高除尘系统过滤性能的变化规律;揭示了不同空气喷雾量主要通过改变粉尘的惯性力、表面粘附力和摩擦力来影响粉尘在滤料表面的沉积形态,进而影响过滤性能的作用机制。
[Abstract]:According to the utilization conditions of coalbed methane, it is necessary to purify it. The existing dust removal technology and previous research are analyzed synthetically. Combined with the working conditions of coal bed methane, the cyclone separator is combined with the filter tube type dust collector. A new type of dust removal system-whirlwind filter dedusting system is designed and developed, and its structure principle and performance index are introduced in detail. Through centrifugal force and inertia, the new dust removal system makes the air flow rotate around the wall of the cyclone tube to remove the coarse particles. Under the action of cyclone centrifugal force, the unseparated fine particles arrive at the position of the filter tube with the air current, and are intercepted in the outer wall of the filter tube. The clean air flow passes through the filter tube and is discharged from the outlet of the filter, and the two stages are separated, and the clean gas is finally discharged. In this paper, the effects of different operating parameters on pressure loss, dust removal efficiency and ash removal efficiency are studied by processing the experimental equipment and setting up the experimental platform. Finally, the optimal operating parameters are determined. Through experimental study, it can be concluded that the dust collection system can effectively separate fine particles by cyclone centrifugal force and filter, and the dust removal efficiency can reach 99.9967 ~ 99.9969, which is about 19 percentage points higher than that of cyclone dust collector. The first cycle is 2872s, which prolongs the filter barrel life by 502s compared with the filter drum filter. The life of the filter tube in the cyclone filter dust collector can be improved effectively. In addition, the effect of air spray on the performance parameters of cyclone filter and dust removal system is studied. It is revealed that different amount of air spray mainly influences the deposition morphology of dust on the surface of filter media by changing the inertia force, surface adhesion force and friction force of dust, and then affects the mechanism of filtration performance.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD714.4

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