摘要
随着火电厂粉尘排放标准日益严格,现有电除尘器的运行效率将越来越难以满足排放要求。影响电除尘器除尘效率进一步提高的主要因素之一是对细微粉尘的收集。
本文针对电除尘器逃逸粉尘的特点,提出了以冲击粘附方式进行捕集的概念。从粉尘粘附机理上进行了分析,对冲击粘附装置内的二维流场进行了模拟,并进行了现场收尘实验,测试除尘效率,验证了以其作为电除尘器的辅助除尘工具,提高除尘效率的可行性。
The emission standard of particles in power plants is increasingly strict, so the concentration of fly ash escaped from ESP could not meet the demand of emission standard. The fine fly ash can not be disposed effectively, it is one of the main factors that influenced the efficiency improvement of ESP.
In this paper, basing on the characteristic of fly ash escaped from ESP, the impactive adhesion set is put forward to concentrate it. The mechanism of adhesion, the 2-dimonsion flow field of the impactor have been analyzed and some experiments have been done to test the efficiency. These show that the set as an assistant implement is a feasible way to improve the efficiency.
引文
[1] 王励前,张德轩.火电厂的烟尘治理和排放标准.第十届全国电除尘暨第二界脱硫学术会议:2003.11.74-88
[2] 张勇胜,边疆,方梦祥,王树荣.煤粉炉应用撞击式分离器的可行性分析.河北电力技术. 1999(3):12-15
[3] 张永照,李荫堂,张西民.冲击式槽形管惯性分离器的试验研究.动力工程,1989(6):32-35.
[4] 王广军,陈红.冲击式炉内粗灰分离装置试验研究及其防磨效果预测.锅炉技术.1999,30(9):16-20
[5] 李晓东,严建华,李扬新,沈跃良,倪明江,岑可法.鳍片管束撞击式气固分离器的试验研究.工程热物理学报.1995,16(3):363-367.
[6] 孙熙,柳敬献,王勇,李永胜.管帏冲击式除尘器的应用.工业安全与环保.2004,30(11):6-7
[7] 周跃光.复合型冲击式除尘器的研制与应用.云南环境科学.2003,22(3):57-59
[8] Anatolii D.Zimon. Adhesion of Dust and Powder(Robert K.Johnston). New York: Consultants Bureau. 1982.271-305
[9] Craig Dunbar, Abdo Kataya, Tiba Tiangbe. Reducing bounce effects in the Andersen cascade impactor. International Journal of Pharmaceutics 301.2005, 25–32
[10] Philip Demokritou, SeungJoo Lee, Stephen T. Ferguson, Petros Koutrakis. A compact multistage (cascade) impactor for the characterization of atmospheric aerosols. Aerosol Science 35.2004, 281–299
[11] Asking L., Olsson B. Calibration at different flow rates of a multistage liquid impinger. Aerosol Sci. Technol. 1997,27, 39–49
[12] Cheng Y.-S.,Yeh H.-C., Particle bounce in cascade impactors. Environ. Sci. Technol. 1979,13, 1392–1396
[13] Kavouras I.G., Koutrakis P. Use of polyurethane foam as the impaction substrate/collection medium in conventional inertial impactors. Aerosol Sci. Technol. 2001,34, 46–56.
[14] Huang C.-H., & Tsai, C.-J. Mechanism of particle impaction and eltration by the dry porous metal substrates of an inertial impactor. Aerosol Science and Technology. 2003 37, 486–493.
[15] Huang C.-H., Tsai C.-J., & Shih, T.-S. Particle collection effciency of an inertial impactor with porous metal substrates. Journal of Aerosol Science. 2001,32, 1035–1044.
[16] Pak S., Liu H., & Rubow K. Effect of coatingthickness on particle bounce in inertial impactors. Aerosol Science and Technology. 1992,16, 141–150.
[17] Nicholas C. Miller , Danna L. Ross, Moheb M. Nasr. Effect of formulation factors on the observed bounce in cascade impactors used to measure the spray particle size of metered dose inhalers. International Journal of Pharmaceutics 173.1998,93–102.
[18] Michael Hindle, Peter R. Byron, Nicholas C. Miller. Cascade impaction methods for dry powder inhalers using the high flowrate Marple-Miller Impactor. International Journal of Pharmaceutics 134.1996, 137-146.
[19] 嵇敬文.除尘器.中国建筑工业出版社,1981.18-21
[20] C.N.Davies, Brit. J. Appl.Phys.,18(12):1787
[21] B.Dahneke, J. Colloid Interface Sci.,45(3):584
[22] K.V.Kochnev, V.V.D,yakov,and V.I.Kovalev, in collection: Collected Works on Silicosis, Ural. Fil. Akad. Nauk SSSR,Sverdlovsk(USSR):119
[23] Benjamin Y.H.Liu and Hsu-Chi Yeh, J. Appl. Phys.39(3):1396
[24] Chieh-San Chao, in collection: Problems in Engineering Geology and Soil Science, Izd. Mosk. Gos. Univ., Moscow, 323
[25] E.Duishenov, Zh. T. Tekenov, and A.D.Zimon, in collection: Collected Works of Frunze Polytechnic Institute, Izd.Mekten, No.5, 110
[26] L.E.Faith et al., Ind.Eng. Chem. Fundam., 6(4):519
[27] R.L.Stein, W.H.Ryback, and W.A.Sparks, J. Colloid Interface Sci., 42(2):441
[28] 刘顺隆,郑群.计算流体力学.黑龙江:哈尔滨工程大学出版社,1998.199-211
[29] 傅德薰.流体力学数值模拟.北京:国防工业出版社,1993. 212-216
[30] 张兆顺,崔桂香.流体力学.北京:清华大学出版社,1999. 228
[31] 吴淑虹.圆形撞击式分离器的试验研究和数值模拟.硕士学位论文.浙江大学.2004
