旋風分離器對稱蝸管進口的實驗室研發(fā)@中英文翻譯@外文翻譯

1、Short communicationDevelopment of a symmetrical spiral inlet to improve cyclone separator performanceBingtao Zhao*, Henggen Shen, Yanming KangDepartment of Environmental Engineering, Donghua University, No. 1882, Yanan R

2、d., Shanghai, Shanghai 200051, ChinaReceived 28 October 2003; received in revised form 24 February 2004; accepted 3 June 2004 Available online 17 July 2004AbstractThree cyclone separators with different inlet geometry we

3、re designed, which include a conventional tangential single inlet (CTSI), a direct symmetrical spiral inlet (DSSI), and a converging symmetrical spiral inlet (CSSI). The effects of inlet type on cyclone performance chara

4、cteristics, including the collection efficiency and pressure drop, were investigated and compared as a function of particle size and flow rate in this paper. Experimental result indicated that the symmetrical spiral inle

5、t (SSI), especially CSSI inlet geometry, has effect on significantly increasing collection efficiency with insignificantly increasing pressure drop. In addition, the results of collection efficiency and pressure drop com

6、parison between the experimental data and the theoretical model were also involved.Keywords: Cyclone; Symmetrical spiral inlet; Collection efficiency; Pressure drop1. IntroductionCyclone separators are widely used in the

7、 field of air pollution control and gas–solid separation for aerosol sampling and industrial applications [1]. Due to relative simplicity to fabricate, low cost to operate, and well adapt- ability to extremely harsh cond

8、itions, cyclone separators have became one of most important particle removal device that preferably is utilized in both engineering and process operation. However, the increasing emphasis on environ- ment protection and

9、 gas–solid separation is indicating that finer and finer particles must be removed. To meet this challenge, the improvement of cyclone geometry and per- formance is required rather than having to resort to alterna- tive

10、units. Many researchers have contributed to large volume of work on improving the cyclone performance, by introducing new inlet design and operation variables. These include studies of testing a cyclonic fractionator for

11、 sampling that used multiple inlet vanes by Wedding et al.[2], developing a mathematic model to predict the collection efficiency of small cylindrical multiport cyclone by DeOtte [3], testing a multiple inlet cyclones ba

12、sed on Lapple’ type geometry by Moore and Mcfarland [4], designing and testing a respirable multiinlet cyclone sampler that minimize the orientation bias by Gautam and Streenath [5], and comparing the performance of a do

13、uble inlet cyclone with clean air by Lim et al. [6]. In this paper, the new inlet type, which is different type of inlet from that used by former researchers, was developed, and the experimental study on addressing the e

14、ffect of inlet type on cyclone performances was presented.2. ExperimentalThree kinds of cyclone separators with various inlet geometries, including conventional tangential single inlet (CTSI), direct symmetrical spiral i

15、nlet (DSSI), and converg- ing symmetrical spiral inlet (CSSI), were manufactured and studied. The geometries and dimensions these cyclones are presented in Fig. 1 and Table 1. To examine the effects of inlet type, all ot

16、her dimensions were designed to remain the same but only the inlet geometry.* Corresponding author. Tel.: +86-21-62373718; fax: +86-21- 62373482. E-mail address: zhaobingtao@mail.dhu.edu.cn (B. Zhao).Powder Technology 14

17、5 (2004) 47–50The comparison show that some model can predict a theoretical result that closed the experimental data, but the changes of flow pattern and particle concentration distribu- tion induced by symmetrical spira

18、l inlet having effects on cyclone performance were not taken into account adequately in developed theories. To examine the effects of the symmetrical spiral inlet on cyclone performance more clearly, Fig. 6 was prepared,

19、 depicting the 50% cut size for all models with varying the flow rate or inlet velocity. The 50% cut size of Models C and B are lower than that of Model A at the same inletvelocity. As the inlet velocity is decreased, th

20、e 50% cut size is approximately decreased linearly. With inlet velocity 20.18 m/s, for example, the decrease rate of 50% cut size is up to 9.88% for Model B and 24.62% for Model C. This indicated that the new inlet type

21、can help to enhance the cyclone collection efficiency.3.2. Pressure dropThe pressure drop across cyclone is commonly expressed as a number gas inlet velocity heads DH named the pressureFig. 4. Grade efficiency of the cyc

22、lones at different inlet velocities. (a) Inlet velocity = 11.99 m/s. (b) Inlet velocity = 16.04 m/s. (c) Inlet velocity = 20.18 m/s. (d) Inlet velocity = 23.85 m/s.Fig. 5. Comparison of experimental grade efficiency with