用于袋式除尘器的拉瓦尔型喷嘴脉冲清灰性能分析
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摘要
为了改善袋式除尘器脉冲清灰性能,基于航空航天等领域拉瓦尔喷管技术,设计了适用于脉冲喷吹袋式除尘器的新型喷嘴——拉瓦尔型喷嘴,运用CFD仿真技术结合实验研究,分析喷吹压力和喉部直径对喷嘴清灰性能的影响,并与相同孔径常规喷嘴对滤袋的响应和清灰效率进行对比分析。结果表明:采用拉瓦尔型喷嘴进行清灰时,滤袋侧壁正压力峰值是常规喷嘴的1. 29倍;拉瓦尔型喷嘴对长袋的清灰效果更为明显,一次喷吹清灰效率可达96%,证明该拉瓦尔型喷嘴在袋式除尘领域具有较好的应用前景。
A new nozzle Laval nozzle applicable to pulse-jet bag filter was designed based on the Laval nozzle technology in aerospace field for improving the pulse cleaning performance of bag filter. By use of CFD simulation technology and in combination with experimental study,this paper analysed the influence of injection pressure and throat diameter on cleaning performance,and conducted comparative analysis on response and dust cleaning efficiency of common nozzles with the same bore diameter. The results showed: when Laval nozzle was used for dust cleaning,it had the positive pressure peak value of bag sidewall 1. 29 times more than that of common nozzles; and Laval nozzle had a more significant dust cleaning effect on long bags,with one-time dust cleaning efficiency up to 96%. Therefore,Laval nozzle had a better application prospect in bag filter field.
A new nozzle Laval nozzle applicable to pulse-jet bag filter was designed based on the Laval nozzle technology in aerospace field for improving the pulse cleaning performance of bag filter. By use of CFD simulation technology and in combination with experimental study,this paper analysed the influence of injection pressure and throat diameter on cleaning performance,and conducted comparative analysis on response and dust cleaning efficiency of common nozzles with the same bore diameter. The results showed: when Laval nozzle was used for dust cleaning,it had the positive pressure peak value of bag sidewall 1. 29 times more than that of common nozzles; and Laval nozzle had a more significant dust cleaning effect on long bags,with one-time dust cleaning efficiency up to 96%. Therefore,Laval nozzle had a better application prospect in bag filter field.
引文
[1]宋七棣,姚群.袋式除尘行业2017年发展综述[J].中国环保产业,2018(4):5-10.
[2] Zheng C H, Chikao K. Recent advances in dust collection technology and ISO standardization in bag filtration[J]. Zhejiang Univ-Sci A(Appl Phys&Eng),2018,19(1):21-33.
[3] Qian Y L,Bi Y,Zhang M X,et al. Effect of filtration operation and surface treatment on pulse-jet cleaning performance of filter bags[J]. Powder Technology,2015,277:82-88.
[4]王丹丹,钱付平,夏勇军,等.基于故障树分析法袋式除尘器滤袋失效的研究与应用[J].环境工程学报,2016,10(6):3118-3124.
[5] Yao S B,Tang X M,Wang J P. Numerical study of the propulsive performance of the hollow rotating detonation engine with a laval nozzle[J]. International Journal of Turbo&Jet-Engines,2017,34(1):49-54.
[6] Dumitrescu O,Gherman B,Tipa T. Development of a Laval nozzle for a cold gas propulsion system[J]. IOP Conference Series:Materials Science and Engineering,2018,400:42016.
[7] Si C R,Zhang X J,Wang J B,et al. Design and evaluation of a Laval-type supersonic atomizer for low-pressure gas atomization of molten metals[J]. International Journal of Minerals,Metallurgy,and Materials,2014,21(6):627-635.
[8] Shikalov V S,Klinkov S V,Usynin S Y. Spherical particles velocity in a supersonic jet flowing out from an ejector nozzle used in cold spray[J]. AIP Conference Proceedings,2018.
[9] Bian J, Cao X W, Yang W, et al. Supersonic liquefaction properties of natural gas in the Laval nozzle[J]. Energy,2018,159:706-715.
[10] Vanmore V V,Dabade U A. Development of Laval nozzle for micro abrasive jet machining processes[J]. Procedia Manufacturing,2018,20:181-186.
[11] Shim J,Joe Y,Park H. Influence of air injection nozzles on filter cleaning performance of pulse-jet bag filter[J]. Powder Technology,2017,322:250-257.
[12]杨超,陈波,姜万录,等.基于拉瓦尔效应的超音速喷嘴雾化性能分析与试验[J].农业工程学报,2016,32(19):57-64.
[13]林龙沅,陈海焱,颜翠平,等.诱导气流对脉冲喷吹滤筒除尘器清灰影响的研究[J].现代矿业,2011,27(9):26-28.
[14]张情,陈海焱,巨敏,等.诱导喷嘴改进滤筒脉冲清灰效果的实验研究[J].环境工程,2012,30(1):62-65,138.
[15] Qian Y L,Chen H Y,Dai H D,et al. Experimental study of the nozzle settings on blow tube in a pulse-jet cartridge filter[J].Separation and Purification Technology,2018,191:244-249.
[16]陆永华,魏文权,邵飞翔,等.拉瓦尔喷管小推力测量系统数值计算研究[J].机电工程,2016,33(10):1188-1192.
[17] Zhu Y H,Jiang P X. Experimental and analytical studies on the shock wave length in convergent and convergent-divergent nozzle ejectors[J]. Energy Conversion and Management,2014,88:907-914.
[18] Hou D Y,Jiang W M,Zhao W X,et al. Effect of linetype of convergent section on supersonic condensation characteristics of CH4-CO2mixture gas in Laval nozzle[J]. Chemical Engineering and Processing-Process Intensification,2018,133:128-136.
[2] Zheng C H, Chikao K. Recent advances in dust collection technology and ISO standardization in bag filtration[J]. Zhejiang Univ-Sci A(Appl Phys&Eng),2018,19(1):21-33.
[3] Qian Y L,Bi Y,Zhang M X,et al. Effect of filtration operation and surface treatment on pulse-jet cleaning performance of filter bags[J]. Powder Technology,2015,277:82-88.
[4]王丹丹,钱付平,夏勇军,等.基于故障树分析法袋式除尘器滤袋失效的研究与应用[J].环境工程学报,2016,10(6):3118-3124.
[5] Yao S B,Tang X M,Wang J P. Numerical study of the propulsive performance of the hollow rotating detonation engine with a laval nozzle[J]. International Journal of Turbo&Jet-Engines,2017,34(1):49-54.
[6] Dumitrescu O,Gherman B,Tipa T. Development of a Laval nozzle for a cold gas propulsion system[J]. IOP Conference Series:Materials Science and Engineering,2018,400:42016.
[7] Si C R,Zhang X J,Wang J B,et al. Design and evaluation of a Laval-type supersonic atomizer for low-pressure gas atomization of molten metals[J]. International Journal of Minerals,Metallurgy,and Materials,2014,21(6):627-635.
[8] Shikalov V S,Klinkov S V,Usynin S Y. Spherical particles velocity in a supersonic jet flowing out from an ejector nozzle used in cold spray[J]. AIP Conference Proceedings,2018.
[9] Bian J, Cao X W, Yang W, et al. Supersonic liquefaction properties of natural gas in the Laval nozzle[J]. Energy,2018,159:706-715.
[10] Vanmore V V,Dabade U A. Development of Laval nozzle for micro abrasive jet machining processes[J]. Procedia Manufacturing,2018,20:181-186.
[11] Shim J,Joe Y,Park H. Influence of air injection nozzles on filter cleaning performance of pulse-jet bag filter[J]. Powder Technology,2017,322:250-257.
[12]杨超,陈波,姜万录,等.基于拉瓦尔效应的超音速喷嘴雾化性能分析与试验[J].农业工程学报,2016,32(19):57-64.
[13]林龙沅,陈海焱,颜翠平,等.诱导气流对脉冲喷吹滤筒除尘器清灰影响的研究[J].现代矿业,2011,27(9):26-28.
[14]张情,陈海焱,巨敏,等.诱导喷嘴改进滤筒脉冲清灰效果的实验研究[J].环境工程,2012,30(1):62-65,138.
[15] Qian Y L,Chen H Y,Dai H D,et al. Experimental study of the nozzle settings on blow tube in a pulse-jet cartridge filter[J].Separation and Purification Technology,2018,191:244-249.
[16]陆永华,魏文权,邵飞翔,等.拉瓦尔喷管小推力测量系统数值计算研究[J].机电工程,2016,33(10):1188-1192.
[17] Zhu Y H,Jiang P X. Experimental and analytical studies on the shock wave length in convergent and convergent-divergent nozzle ejectors[J]. Energy Conversion and Management,2014,88:907-914.
[18] Hou D Y,Jiang W M,Zhao W X,et al. Effect of linetype of convergent section on supersonic condensation characteristics of CH4-CO2mixture gas in Laval nozzle[J]. Chemical Engineering and Processing-Process Intensification,2018,133:128-136.