对撞式喷吹与环形隔板协同改进除尘滤筒清灰性能研究  

Improving Cleaning Performance of Dust Filter Cartridge by Opposing Pulsed-jet Cooperate with Annular Baffle

作　　者：邢真强 钟建芳 吴泉泉 高康泰 李建龙[2] XING Zhenqiang;ZHONG Jianfang;WU Quanquan;GAO Kangtai;LI Jianlong(CCTEG Shenyang Research Institute,Shenyang 110141,China;School of Resources&Environment Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]中煤科工集团沈阳研究院有限公司,辽宁沈阳110141 [2]南昌大学资源与环境学院,江西南昌330031

出　　处：《金属矿山》2024年第11期227-235,共9页Metal Mine

基　　金：国家自然科学基金项目(编号:52064037);江西省主要学科学术和技术带头人培养计划青年人才项目(编号:20225BCJ23027)。

摘　　要：针对干式过滤除尘器的滤筒存在清灰“盲区”且整体清灰效果不足的问题,通过数值模拟研究了环形隔板安设和对撞式喷吹策略对滤筒内喷吹流场的影响,考察了环形隔板尺寸、喷吹压力比PR对喷吹强度、喷吹均匀性、综合静压和喷吹耗气量的影响,分析了对撞喷吹与环形隔板对滤筒清灰的协同作用效果,探究了环形隔板及对撞喷吹最佳清灰参数。研究结果表明:①环形隔板有利于减少滤筒顶部开口面积,抑制反弹的喷吹气流从开口处逸出,减小能量损失,环形隔板尺寸外径和内径[R,r]=[120,45]mm时滤筒的清灰性能最佳。②提高对撞式喷吹的PR值有利于对撞形成的相对高压区域在滤筒内上移,但PR过大会导致底部喷吹气流径直通过环形隔板中心而失去有效阻挡;分段对喷PR=[1.00,1.00,1.33,2.00]模式在保证喷吹性能的同时可以降低消耗的压缩气体,与环形隔板协同作用时尤其有利于促进滤筒上部区域对撞形成静压的蓄积,显著提升喷吹效果。③在推荐的最佳清灰参数([R,r]=[120,45]mm、喷吹压力比PR=[1.00,1.00,1.33,2.00])条件下,较普通单向喷吹时滤筒上部区域喷吹静压提升了249.1%、整体喷吹强度提升了63.0%、综合静压提升了111.6%、均匀性提升了26.7%。In order to solve the filter cartridge problems of"blind zone"and insufficient cleaning effect of dry-type dust filter collector,the influence of annular baffle and opposing pulsed-jet method on the flow field in filter cartridge was studied by numerical simulation.The effect of baffle size,pulsed-jet pressure ratio PR,of primary nozzle and auxiliary nozzle on pulsed-jet intensity,uniformity,compressive static pressure,and gas consumption were investigated.The synergistic effect of collision injection and annular baffle on filter cartridge cleaning was analyzed.The study results show that:①The annular baffle is advantageous in reducing the area of the top opening of the filter cartridge,impeding the airflow that rebounds from the cartridge bottom,and preventing energy loss.When the annular baffle size outer and inner diameters[R,r]=[120,45]mm,the dust cleaning performance of the filter cartridge is the best.②Increasing the PR values of the opposing pulsed-jet helps the relatively high pressure area formed by the collision move up in the filter cartridge,but the too large PR will cause the bottom jet flow to pass directly through the center of the annular baffle and lose the effective barrier.The multi-staged opposing pulsed-jet cleaning mode with PR=[1.00,1.00,1.33,2.00]ensures the cleaning performance while reducing the compressed gas consumption When cooperating with multi-staged opposing pulsed-jet cleaning mode,the annular baffle plate is especially beneficial to promote the accumulation of static pressure formed by collision in the upper section of the filter cartridge,so as to realize significant improvement of the spray effect.③The optimum parameters([R,r]=[120,45]mm,pressure ratio PR=[1.00,1.00,1.33,2.00])recommended in this paper increase the pulsed-jet static pressure in the upper section region of the cartridge by 249.1%,the overall pulsed-jet intensity by 63.0%,the comprehensive static pressure by 111.6%,and the uniformity by 26.7%compared with the conventional pulsed-jet cleaning.

关 键 词：干式除尘器 滤筒清灰 分段对喷 环形隔板 喷吹性能 

分 类 号：TD714[矿业工程—矿井通风与安全]