滤筒除尘器喷吹孔孔径的优化

Optimization of blowing hole aperture of cartridge dust collector

【目的】为控制各个喷吹管气流量的均匀性,对喷吹管上的喷吹孔径进行优化,提高滤筒除尘器清灰效果。【方法】自制高压脉冲喷吹气流量测量装置对现有喷吹管气流量进行测定,采用光纤传感分析仪测试除尘器滤筒各部分的侧壁压力峰值,分析各滤筒清灰效果不均匀的原因;以滤筒各部位侧壁压力峰值作为清灰均匀性效果评估指标,优化喷吹孔径。【结果】优化前4个喷吹孔径均为19 mm,喷吹孔的气流量依次为13.69、 14.78、 16.03、 16.93 L,对应4个滤筒上、中、下部侧壁压力峰值的最小值分别为最大值的37%、 26%、 20%,气流量均匀度标准差为1.41;优化后4个喷吹孔径分别为23、 20、 18、 17 mm,喷吹气流量依次为14.05、 15.08、 15.87、 16.13 L,对应4个滤筒上、中、下部测壁压力峰值的最小值为最大值的56%、 56%、 53%,气流量均匀度标准差降为0.93。【结论】优化后的喷吹管气流量均匀化程度提高,可实现滤筒除尘器的均匀清灰。

Objective Pulse-blowing cartridge dust collectors are widely used for their exceptional dust removal efficiency. However, the existing blowpipe design adopts the same blowing aperture, which makes the cartridge cleaning effect poor, negatively affecting the overall cleaning effect of the cartridge dust collector and the cartridge's service life. In order to achieve the uniformity through the airflow of the blowpipe and achieve consistently effect of uniform dust cleaning across the cartridge dust collector, optimizing the blowing orifice diameter of the blowpipe is essential.Methods Firstly, the peak pressure on the sidewalls of each part of the filter cartridge was measured and a self-made pulse-blowing gas flow measurement device was used to measure the porous blowing gas flow of the existing cartridge dust collector to analyze the inhomogeneity of the soot cleaning effect. Secondly, the effect of the blowing aperture on the blowing air flow rate and sidewall pressure peak value of the cartridge was investigated to optimize the blowing aperture. Finally, the optimization effect was evaluated by taking the sidewall pressure peak value of each part of the cartridge as an index.Results and Discussion Before optimization, all four blowholes possess diameters of 19 mm, with air flow rates of 13.69, 14.78, 16.03 and 16.93 L, resulting in a standard deviation of 1.41, indicating the air flow rate uniformity. The peak sidewall pressures at the upper measurement points of the four canisters are 369, 713, 971 and 1 000 Pa, respectively. At the middle, pressrues are 699, 1 472, 1 601 and 2 627 Pa, which are 694, 1 612, 2 357 and 3 416 Pa at the lower points. The maximum difference in sidewall pressure(between the maximum and minimum values) at the upper, middle and lower parts of the cartridges is 631, 1 928 and 2 722 Pa, respectively. The minimum value of the peak sidewall pressure at the upper, middle and lower parts of the four cartridges is 37%, 26% and 20% of the maximum value. After optimization, the blowholes diameters are adjusted to 23, 20, 18 and 17 mm, with air flow rates of 14.05, 15.08, 15.87 and 16.13 L, resuiling in a reduced standard deviation of 0.93, indicating the improved air flow rates uniformity. The peak sidewall pressures at the upper measurement points of the four canisters are 500, 850, 898 and 767 Pa, respectively. At the middle points, pressures are 1 350,1 517, 1 708 and 2 400 Pa, and they are 1 601, 2 033, 2 323, 3 027 Pa at the lower measurement points.The maximum difference in sidewall pressure at the upper, middle and lower parts of the cartridges is 398, 1 050 and 1 426 Pa, respectively. The minimum value of the peak sidewall pressure at the upper, middle and lower parts of the four cartridges is 56%, 56% and 53% of the maximum value. Compared with before optimization, the homogeneity increases by 1.5, 2.2 and 2.7 times, respectively.Conclusion The non-uniformity of the air-flow rate of different blow holes on the same blow pipe was verified by the pulse-blowing airflow measuring device. The uniformity of the airflow rate was improved after optimizing the diameter of the blow holes. The range of variation of the peak pressure on the sidewall was reduced, and the uniformity of the cartridge ash cleaning was significantly improved.