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id="zoom"><p><p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;"><b>袋式除尘å™?/b>设计是否合理、运行是否正常,主要表现在滤袋使用寿命及设备运行阻力上,滤袋的破损与设备运行阻力偏高有一定的关系。当含尘气体进入到除尘器后,由于筛滤、碰撞、滞留、扩散、静电等效应,滤袋表面会形成粉尘层ã€?/span><span style="font-size:16px;">  </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">随着粉尘在滤袋表面的积聚,袋式除尘器的效率和阻力也都相应的增加,除尘器的阻力过高会使除尘系统的风量下降,除尘效率也会大大的降低,因此在除尘器运行中要多关注除尘器的阻力是否偏高,如果出现问题应该从哪些方面排查原因?</span><span style="font-size:16px;">  </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">除尘器运行阻力由滤袋、本体及吸附在滤袋上的粉尘等三部分引起的。结构设计差异、滤料材质、过滤风速、气体含尘浓度、粉尘粒度、气体湿度等因素对袋式除尘器运行阻力影响较大ã€?/span><span style="font-size:16px;">  </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">1</span><span style="font-size:16px;">、结构设计是否合ç? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">包括进出风道截面、大型袋式除尘器均风装置、气流通过的各部位截面尺寸以及锁风、检修门密封、设备保温等设计。结构设计不合理会使设备运行阻力偏高,合理的结构设计其本体阻力在</span><span style="font-size:16px;">400pa</span><span style="font-size:16px;">左右ã€? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">2</span><span style="font-size:16px;">、粉尘浓åº? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">粉尘浓度过高时,颗粒之间的碰撞几率增大,使得颗粒粘附在一起,这对袋式除尘器的运行阻力也会造成一定的影响。同时,浓度的增大也就意味着在单位时间内滤袋单位面积上附着的粉尘厚度会增大,所产生的压力损失也会随之增大,这种情况下常常会通过清灰频率来使设备正常工作,但这会使滤袋膨胀频率提高,滤袋与袋笼摩擦加剧,使得滤袋寿命降低,滤袋失效。滤袋失效反过来会导致滤袋压损增加,设备运行阻力偏高ã€?/span><span style="font-size:16px;">  </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">此外,清灰时反吹的正压气体也是袋式除尘器运行阻力显高的原因之一,频繁喷吹正压气体进入袋室,势必会加大设备的运行阻力。因此,当粉尘浓度过高时,应在进风道和灰斗内增加挡料均风装置,进行预收尘处理,以减小袋式除尘器滤袋负荷,降低设备阻力ã€?/span><span style="font-size:16px;">  </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">3</span><span style="font-size:16px;">、粉尘粒åº? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">粉尘颗粒对袋式除尘器的主要影响表现在压力损失和设备磨损上。对压力损失******的是微细粉尘,它能堵塞过滤空隙,降低滤料的透气性,使阻力增大。一般认为针状结晶颗粒和薄片状颗粒容易堵塞滤袋,降低除尘效率,加大运行阻力。对于颗粒较细的含尘气体应采用覆膜滤袋,如水泥窑尾、矿渣粉磨系统等ã€?/span><span style="font-size:16px;">  </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">4</span><span style="font-size:16px;">、湿åº? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">气体中常含有少量水蒸气,当相对湿度在</span><span style="font-size:16px;">30%</span><span style="font-size:16px;">â€?/span><span style="font-size:16px;">80%</span><span style="font-size:16px;">之间为一般状态,超过该范围时即为高湿度状态。当袋式除尘器内气体处于高湿度状态时,在外部冷空气的作用下,结露现象发生,造成粉尘粘结而堵塞滤袋,使滤料的捕尘功能下降,清灰困难,设备压力随之增高。对于结露,一般尽量选择表面光滑的滤料,如覆膜滤料。另外,做好设备的保温,提高含尘气体入口温度,能降低冷空气的负面作用,防止结露现象的发生ã€? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">5</span><span style="font-size:16px;">、滤料的透气æ€? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">一般情况下洁净滤布的压力损失比较小,透气性较高,在工作中,其压力损失小意味着他的孔隙相对较大,粉尘容易穿透,一般情况下对粉尘的不捕集性也就比较低。另外滤袋表面粉尘层的压力损失是影响滤袋压力损失的因素之一,它与滤布孔隙是否堵塞有关,所以要求滤布孔隙不易堵塞,收尘率高,压力损失小,清灰性能好,寿命长等特点ã€?/span><span style="font-size:16px;">  </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">6</span><span style="font-size:16px;">、滤袋过滤风é€? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">过滤风速是袋式除尘器重要的参数。当清灰方式、滤料材质、烟尘特性不同时,所设计的过滤风速也应不同,因此所产生的过滤阻力也是不一样的ã€?/span><span style="font-size:16px;">  </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">对于水泥行业的粉尘,当收集水泥时,由于粉尘湿度小,粘性相对较小,常使用脉冲袋式除尘器,所采用的过滤风速一般为</span><span style="font-size:16px;">0.8~1.0m/min</span><span style="font-size:16px;">ï¼? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">对于烘干除尘或水泥回转窑尾气除尘时,由于烟尘水分相对较高,粉尘湿度相对较大,当采用玻纤袋反吹风袋式除尘器时,过滤风速一般控制在</span><span style="font-size:16px;">0.3</span><span style="font-size:16px;">ï½?/span><span style="font-size:16px;">0.5m/min</span><span style="font-size:16px;">之间,当采用长袋脉冲袋式除尘器时,过滤风速一般控制在</span><span style="font-size:16px;">0.7</span><span style="font-size:16px;">ï½?/span><span style="font-size:16px;">0.9m/min</span><span style="font-size:16px;">之间ï¼? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">对于水泥和冶金行业的煤粉制备,由于粉尘浓度大、颗粒小、易燃易爆等特点,其过滤风速一般控制在</span><span style="font-size:16px;">0.6</span><span style="font-size:16px;">ï½?/span><span style="font-size:16px;">0.8m/min</span><span style="font-size:16px;">之间ï¼? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">而对于矿渣超细研磨、石灰窑石灰等收尘,由于粉尘颗粒小,浓度高,又有一定粘性,通常选用矿渣微粉用脉冲袋式除尘器,所采用的过滤风速在</span><span style="font-size:16px;">0.7</span><span style="font-size:16px;">ï½?/span><span style="font-size:16px;">0.9m/min</span><span style="font-size:16px;">之间ã€? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">7</span><span style="font-size:16px;">、清灰效çŽ? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">当除尘器清灰效率不高时,由于滤袋表面过多粉尘的附着,将直接导致运行阻力的升高。因此提高除尘器的清灰效率,也是设备降阻的保证措施之一ã€?/span><span style="font-size:16px;">  </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">当滤袋过长时,还可能因为喷吹力度或喷吹气量不够,使得靠近滤袋底部的部分清灰效率低下。喷嘴与花板的间距、喷嘴的大小、滤袋的长度、脉冲阀的型号,这些因素之间的合理搭配,能够减少因喷吹系统导致清灰效率较低、运行阻偏高等情况发生ã€?/span><span style="font-size:16px;">  </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">8</span><span style="font-size:16px;">、管è·? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">系统正压影响及设备系统漏风脉冲管路系统清灰所采用的是高压气体,为正压状态,为了达到清灰的效果,脉冲阀所喷射的压缩空气必须达到一定的量,这个量一般为所清灰滤袋内部体积çš?/span><span style="font-size:16px;">2</span><span style="font-size:16px;">倍以上ã€? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">在工作状态下,设备箱内为负压,当向内喷射过度正压气流时,将必然使得设备前后阻力数值提高,该效果等同于设备漏风,因此,合理的选用喷吹压力及喷吹时间,既可以延长滤袋的使用寿命,又对降低袋式除尘器的运行阻力由一定的积极作用,这种情况尤其表现在当设备箱室数量比较少时。在实际的生产操作中,有些厂家为了追求清灰效果,盲目的提高清灰压力或延长喷吹时间,这是不行的ã€?/span><span style="font-size:16px;">  </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">清灰压力过高,会加快滤袋的破损,同时也对运行阻力造成影响,而延长喷吹时间,除了喷入更多正压气体,提高设备运行阻力外,对清灰几乎不产生任何的积极影响ã€?/span><span style="font-size:16px;">  </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">9</span><span style="font-size:16px;">、配套件的可靠æ€? </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">袋式除尘器是否选用了合理的清灰顺序、正确型号的脉冲阀和有效的脉冲宽度和喷吹压力,对于保障设备正常运行,减小运行阻力,也有这直接或间接的作用。此外脉冲阀及气缸与电磁阀之间是否配套,各电气元件是否正常工作,直接关系到清灰系统是否正常工作ã€?/span><span style="font-size:16px;">  </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">当清灰系统非正常工作时,清灰工作不能有效进行,将直接导致运行阻力偏高。除了各电气元件是否正常工作外,对于离线清灰的袋式除尘器,当提升阀板脱落,致使阀板盖住出风口,对应箱室处于离线状态,会导致设备实际工作单元数少于设计单元数,即部分箱室处于非工作状态,这样将使设备运行阻力始终偏高,这种情况在实际生产中常有发生ã€?/span><span style="font-size:16px;">  </span> </p> <p class="MsoNormal" style="text-indent:2em;"> <span style="font-size:16px;">科学合理的结构设计、参数确定、配件选择是袋式除尘器稳定运行的重要环节,设备运行中合理、正确、有效的管理与维护是袋式除尘器稳定运行的保证ã€?/span> </p></p></div> <p><div>上一æ?<a href="73.html">袋式除尘器的正常操作和运转注意事é¡? </a></div> <div>下一æ?<a href="71.html">静电除尘器在使用的时候有哪些优势</a></div> </p> <div id="9z78o5a1" class="tag">相关标签ï¼?a href='/key.aspx?k=%b4%fc%ca%bd%b3%fd%b3%be%c6%f7'>袋式除尘å™?/a>,</div> </blockquote> </div> <div id="9z78o5a1" class="clear"></div> <div id="9z78o5a1" class="recent_comment"> <div id="9z78o5a1" class="title01"><h1><p>相关新闻</p></h1><div id="9z78o5a1" class="clear"></div></div> <ul> <li><a target="_blank" href="/news/109.html" title="布袋过滤机的袋式除尘器之间存在哪些差å¼? 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