簡述降低旋風除塵器內阻力方法

1、旋風除塵器利用離心力和電場力的共同作用分離粒子。 旋風除塵器內安裝電暈極（稱旋風除塵器）但不加電壓 的運行工況稱為旋風除塵器的“靜態(tài)"工況，此時的除 塵效率稱為旋風除塵器的靜態(tài)除塵效率。為了研究安裝 電暈極對旋風除塵器除塵效率的影響，對常規(guī)旋風除塵 器和旋風除塵器兩種情況分別進行了各種入口風速下 的除塵效率實驗。常規(guī)旋風除塵器選用長筒體型，筒體 直徑為40mm、入口尺寸為270 x 110mm,排灰口直徑為 116 mmo排氣管直徑為200 mm,排氣管插入深度460 mmo 在常規(guī)旋風除塵器內安裝電暈極構成旋風除塵器，電暈極由15根直徑4 mm鋼筋構成網狀結構并固定在排氣管上。實驗

2、粉塵為400h目滑石粉，發(fā)塵濃度控制在5g/m3左右。cyclone by using the common role of centrifugal force and electric field force to separate particles corona pole installed in the cyclone (cyclone) but do not add voltage operation called "static" condition of cyclone, called a cyclone dust removal efficiency at

3、a moment when the static dust removal efficiency installation of coronain order to study on the cyclone dust removal efficiency, the influence of the conventional cyclone separator and cyclone two situations respectively under various inlet dust removal efficiency experiment was carried out conventi

4、onal cyclone choose their body, cylinder diameter of 40 mm, entrance size is 270 * 110 mm, ash discharge mouth diameter of 116 mm. exhaust pipe diameter of 200 mm, the exhaust pipe inserted into the depth of 460 mm. in a conventional cyclone ins tailat ion of corona polar cyclone, corona pole consis

5、ts of 15 root diameter 4 mm steel mesh structure and fixed on the exhaust pipe experiment is 400 h mesh talc powder dust, the dust concentration control in 5 g/m 3 or so.常規(guī)旋風除塵器安裝電暈極后除塵效率明顯提高， 除塵效率的變化 規(guī)律 與常規(guī)旋風除塵器除塵效率的 變化規(guī)律相同，即先隨著入口鳳速的增加而增加，至一 最佳運行工況后，除塵效率又有所降低。常規(guī)旋風除塵 器最佳運行工況在入口風速v=17m/s左右，此時，其總 除塵效率

6、達到了 80%;而安裝電暈極以后，旋風除塵器 的靜態(tài)最佳運行工況約在入口風速v=20 m/s左右，靜 態(tài)總除塵效率達到約85%，增幅為6.3%左右。這說明僅 僅安裝電暈極而不加電壓，就能使旋風除塵器的除塵效 率明顯提高電暈極。在旋風除塵器內具有提高效率的作 用。convent ional cyclone dus t cleaning efficiency obviously improved af ter ins tailat ion of corona pole, the changing rule of the dust removal efficiency and the changin

7、g rule of the conventional cyclone dust removal efficiency is the same, namely first increased with the increase of inlet wind speed increase, to the best operation condi t ion, the dust removal efficiency is reduced conventional cyclone best operation condition at the entrance to the wind speed v =

8、 17 m/s or so, at this point, the total dust removal efficiency reached 80%; and after the installation of corona pole, the static optimal operat ing conditions of cyclone about entry about 20 m/s wind speed v =, static total dust removal efficiency of about 85%, growth of around 6.3%. this shows on

9、ly instal1ing corona pole and not add voltage, can make corona polar cyclone dust removal efficiency increased great 1y. within the cyclone has the function of improving efficiency.二、旋風除塵器的阻力second, the res istance of the cyclone由上述可知，電暈極在旋風除塵器內具有提高效率 的作用，通過實驗發(fā)現，電暈極在旋風除塵器內也具有 降低阻力的作用。by above knowab

10、le, corona has improve the efficiency of the function within the cyclone dust collector, found through experiments, corona pole inside the cyclone dust collector also has the effect to reduce res istance旋風除塵器阻力系數2=4. 81,常規(guī)旋風除塵器的 阻力系數1=9. 21,即旋風除塵器的阻力系數比常規(guī)旋 風除塵器的阻力系數降低了約47%。因此，靠電暈極的 作用，較好的改善了旋風除塵器的阻力

11、特性，與常規(guī)旋 風除塵器相比，旋風除塵器是一種低阻力的粒子分離設 備，這對于節(jié)能具有極為重要的實際意義。cyclone separator resistance coefficient factor 2 = 4. 81, the conventional cyclone drag coefficient is deduced 1 = 9. 21, namely the cyclone of drag coefficient than the convent ional cyclone resistance coefficient was reduced by about 47%. by cor

12、ona pole role, therefore, better to improve the resistance characterist ic of the cyclone, compared with the convent ional cyclone, cyclone dust col lector is a kind of low resistance particle separation equipment, i t has very important practical significance for energy conservation.綜上所述，在常規(guī)旋風除塵器內安

13、裝電暈極，具有 降低阻力和提高靜態(tài)除塵效率(稱為“降阻增效”)的 作用，為什么電暈極會對旋風除塵器的阻力和效率有這 么大的影響呢？下面將進行分析。to sum up, in a conventional cyclone installat ion of corona pole, with lower resistance and static dust removal efficiency (called "drag reduction efficiency"), why i s corona pole on the res istance of the cyclone a

14、nd the efficiency have so much influence? here wi11 be analyzed三、電暈極降阻增效的原因分析three, corona resistance reduction efficiencyanalysis of the reasons切向速度的大小和徑向速度分布直接影響顆粒分 離的效率，同時軸向速度分離影響了粒子在旋風除塵器 內有效分離區(qū)域的停留時間，必然對顆粒的除塵效率產 生較大的影響。tangential velocity and radial veloci ty distribution directly affects the s

15、ize of the particle separation efficiency, separation of axial velocity at the same time affected the particle residence time in the valid for cyclone separation area, is a larger impact on particle of dust removal efficiency旋鳳除塵器流動阻力主要由三部分組成：即進口局 部阻力、旋風筒內旋渦流場中的阻力、排氣芯管內的流 動阻力。cyclone flow res istanc

16、e is mainly composed of three parts: namely the import local resistance, the vortex flow field in the cyclone cylinder, exhaust resistance in the core tube flow resistance可見，旋風除塵器的阻力和除塵效率與其內部的流 場分布密切相關，要分析電暈極降阻增效的原因，就需 要知道旋風除塵器內的流場分布。visible, the resistance of the cyclone separator and the dust remo

17、val efficiency is closely related with its internal flow field distr ibut ion, to analyze the cause of corona resistance reduction efficiency extremely, jus t need to know the distribution of flow field in the cyclone為了研究電暈極安裝前后旋風除塵器內三維速度 分布的變化規(guī)律，分別對旋風除塵器內不安裝電暈極 （稱常規(guī)旋風除塵器）和旋風除塵器內安裝電暈極（稱 旋風除塵器）兩種情況鋼塑

18、土工格柵在相同的入口流速 下進行了流場測試，流場測試儀器為五孔探針，在除塵 器錐體部分及其他一些位置，電暈極比較密集，有的地 方五孔探針無法插入，測點適當減少。某些斷面在半徑 的二分之一到三分之一處均無法讀取數據(4、5孔的壓 力不能調到平衡)，分析認為由于電暈極對于筒體內流 場的擾動，這些位置氣流較為紊亂，使4、5孔無法保 持壓力平衡。before installing corona in order to study the changing rule of the three dimensional velocity distribution in cyclone dust col le

19、ctor, were not ins tai led inside the cyclone separator corona (cal led a conventional cyclone) and cyclone corona pole (cyclone) installed in the two cases under the same inlet velocity of the flow field test, the flow field test equipment for the five hole probe, the cone part in filter and some o

20、ther location, corona pole is more intens ive, in some places the five hole probe can't insert, measuring point appropriate reduced some cross section in 1/2 to 1/3 radius are unable to read data (4， 5 hole pressure cannot be transferred to the balance), and analysis that the corona in cylinder

21、flow field disturbances, the airflow was disorder, make 4 or5 hole cannot keep balance of pressures.1. 切向速度的作用1. the role of the tangential velocity安裝電暈極后，切向速度的分布變得平緩、峰值降 低。內渦旋不再是強制渦流動，文獻也得出了類似的 結論。另外，內外渦旋交界面半徑明顯外移，即內外渦 旋交界面直徑由常規(guī)旋風除塵器的05 de外移為 1. 2de （de為排氣管直徑）。礦用風機在筒體和錐體的上 半部，下行流區(qū)的切向速度有所增大，上行流區(qū)的切向

22、速度明顯減小，在除塵器內的整個流動區(qū)域，平均切向 速度明顯降低。af ter ins tai lat ion of corona pole, the distribution of tangential velocity becomes calm, peak decreases wi thin the vortex is no longer forced vortex flow, the literature has also reached a similar conclusion. in addition, the inner and outer vortex off shoring in

23、terface radius is obvious, namely the vortex boundary between ins ide and outside diameter of the conventiona1 cyclone off shoring de de 1. 2 0. 5 for exhaust pipe diameter (de) in the upper half of the cylinder and the cone, downward flow of tangential velocity is increased, the upward flow of tang

24、ential velocity decreases obviously, the flow of the dust collector, the area, an average of tangential velocity is decreased obvious 1y.2. 軸向速度的作用2. the role of the axial velocity旋風除塵器上、下行流交界面內移，即上行流區(qū)變 寬。在下行流區(qū)，軸向速度的絕對值減小，這說明粉塵 粒子在旋風除塵器的有效分離區(qū)域內的停留時間增加, 這對離心力分離粒子是有利的，能夠提高除塵效率。另 外，軸向速度梯度減小，內摩擦阻力降低，有利于

25、旋風 除塵器的減阻。cyclone, downward flow within the interface on the move, which widened upward flow area in the downstream area, the absolute value of axial velocity decreases, and it shows that effective dust particles in the cyclone separation area of residence t ime increases, the centrifugal separation

26、 particle is favorable, can improve the efficiency of dust remova 1. in addition, the axial veloci ty gradient decreases, and internal friction resistance is reduced, is advantageous to the cyclone drag reduct ion.3. 徑向速度及壓力分析的作用3. analysis of the radial velocity and pressure徑向速度分布比較紊亂，尤其在電暈極附近，徑向 速

27、度分布與常規(guī)旋風除塵器相比有較大波動。徑向速度 方向基本都是向心的，其值的大小與常規(guī)旋風除塵器相 比沒有明顯的 規(guī)律，大多數稍微小于原旋風除塵器的 相應值，由于切向速度和徑向速度對粒子的分離起著相 反的作用，前者產生離心力使粒子做向外筒壁的徑向運 動，后者則使粒子做向心的徑向運動從而進入內漩渦。 徑向速度值的減小可提高除塵效率。radial velocity distribution is disorder, especially near corona pole and radial velocity distribution compared with the conventional c

28、yclone have greater volati1ity basic i t is centripetal radial velocity direction, the size of its value compared with the conventional cyclone had no obvious regularity, most s 1 ightly less than the corresponding value of the cyclone, due to the radial and tangential speed plays an opposite role in the separation of particles, the former produces centrifugal force to make particles do outward wall radial motion, which make the particles be centripetal radial movement to enter within the vortex. the decrease of the radial veloci ty values can improv