除塵布袋 堪稱袋式除塵器的心臟，一般被稱為除塵布袋或者除塵濾袋，除塵布袋是袋式除塵器運行過程中的關(guān)鍵部分，通常圓筒型濾袋垂直地懸掛在除塵器中。除塵布袋的面料和設(shè)計應盡量追求高效過濾、易于粉塵剝離及經(jīng)久耐用效果。除塵布袋的選用至關(guān)重要，它直接影響除塵器的除塵效果，選取用除塵布袋從下列幾個方面選取擇:氣體的溫度，潮濕度和化學性，顆粒大小，含塵濃度，過濾風速，清塵方式等因素 布袋除塵器是一種干式除塵裝置，它適用于捕集細小、干燥非纖維性粉塵。濾袋采用紡織的濾布或非紡織的氈制成，利用纖維織物的過濾作用對含塵氣體進行過濾，當含塵氣體進入布袋除塵器，顆粒大、比重大的粉塵，由于重力的作用沉降下來，落入灰斗，含有較細小粉塵的氣體在通過濾料時，粉塵被阻留，使氣體得到凈化。一般新濾料的除塵效率是不夠高的。濾料使用一段時間后，由于篩濾、碰撞、滯留、擴散、靜電等效應，濾袋表面積聚了一層粉塵，這層粉塵稱為初層，在此以后的運動過程中，初層成了濾料的主要過濾層，依靠初層的作用，網(wǎng)孔較大的濾料也能獲得較高的過濾效率。隨著粉塵在濾料表面的積聚，除塵器的效率和阻力都相應的增加，當濾料兩側(cè)的壓力差很大時，會把有些已附著在濾料上的細小塵粒擠壓過去，使除塵器效率下降。另外，除塵器的阻力過高會使除塵系統(tǒng)的風量顯著下降。因此，除塵器的阻力達到一定數(shù)值后，要及時清灰。清灰時不能破壞初層，以免效率下降。[2]布袋除塵器結(jié)構(gòu)主要由上部箱體、中部箱體、下部箱體(灰斗)、清灰系統(tǒng)和排灰機構(gòu)等部分組成。布袋除塵 器性能的好壞，除了正確選擇濾袋材料外，清灰系統(tǒng)對布袋除塵器起著決定性的作用。為此，清灰方法是區(qū)分布袋除塵器的特性之一，也是布袋除塵器運行中重要的一環(huán)。
The dust bag is called the heart of the bag filter. it is generally called the dust bag or the dust filter bag. the dust bag is a key part in the operation of the bagfilter. usually, the cylindrical filter bag is suspended vertically in the dust collector. the fabric and design of the dust bag should be as efficient as possible, easy tcdust and durable. the selection of dust bag is very imortant, it directly affects the dust removal effect of the dust collctor. the dust bag is selected from the fol lowingaspects;gas temperature, humidity and chemoval, part-icle size, dust concentration. filtration wind speed, clear dust wethod and other factors the bag filter is a dry dustcollector that is suitable for capturing fine, dry, non-fibrous dust. the filter bag is made of moven filter cloth or non-woven felt. the dust-containing gas is filtered by thefiltering effect of the fiber fabric. when the dust- containing gas enters the bag -filter, the dust with large specific gravity settles due ti gravity.</div> <div>  </div> <div>       When it falls into the ash hopper, the gas containing the fine dust is retained by the filter material, and the gas is puri-fied. generally, the dust removal efficie- -ncy ofthe new filter material is not high enough. after the filter material is used for a period of time, due to the effects of sieve fi lyration, collision, retent ion, diffusion, staticelectricity, etc, the surface of the filter bag is covered with a layer of dust. this layer of dust is called the pr imary layer. dur ing the subsequent movement, the initial layerbecomes the main filter layer of the filter materiial can rely on the action of the pr imary layer, and the filter material with larger mesh size can also obtain higher filtat-ionefficiency. as the dust accumulates on the surface of the filter material , the efficiency and resistance of the dust col Itor increase accordingly. when the pressure differe-nce between the two sides of the dilter material is large, some fine dust partisles that have adhered to the filter material are squeezed. reduce the efficiency of the precipi-tator. in addition, the excessive resitance of the precipitator will significantly reduce the air vol-ume of the dedusting system, therefore, after the resistance of the precipit-ator reaches a certain value, it should becleaned in time. the initial layer should not be destroyed when cleaning,so as to avoid the efficiency drop. [2]The strcture of the bag filter is mainly composed of an upper box, a middle box, a lower box (ash hopper), a cleaning system and a ash discharging mechanism, the per forma-nce of the bag filter is not only the correct choice of filter bag material, but also the deashing system plays a decisive role in the bag filter, to this end, the cleaning method is one of the charcteristics of the zone distr ibution bag filter and xn important part of the operation of the bag filter.
