Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (1): 10604-010604.doi: 10.11889/j.0253-3219.2016.hjs.39.010604

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles    

Purification of Be-containing offgas by ultrasonic atomization-impinging stream foam tower

FAN Sijun, WU Lei, LIU Zhongying, YAO Jian, MA Jifei, LI Yulan, HOU Huiqi, XIE Leidong, CHEN Kun   

  1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China
  • Received:2015-10-08 Revised:2015-11-02 Online:2016-01-10 Published:2016-01-14
  • Supported by:

    Supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDA02020400)

Abstract:

Background: LiF-BeF2 is used as coolants for Thorium Molten Salt Reactor (TMSR). The offgas from TMSR containing beryllium which is harmful to both human health and the environment must be purified before being discharged. Purpose: A new type wet duster-ultrasonic atomization-impinging stream foam tower was developed. Methods: The beryllium removal properties were investigated by sampling according to national standards. The increase of atomization amount is helpful for improving beryllium removal efficiency. Results: In order to control the absolute humidity offgas after purification, the optimal atomization amount is set at 80 mL·min-1. The ultrasonic humidifier should be installed 3 m away from the foam tower. Particles with diameter bigger than 0.4μm can be removed effectively. The beryllium removal efficiency of offgas increases with the initial beryllium concentration and the offgas velocity which is optimized at 12 m·s-1. The optimal water level in the tower is 40 cm when the offgas velocity is 12 m·s-1. Conclusion: The results indicate that ultrasonic atomization-impinging stream foam tower is suitable for purifying offgas containing beryllium in TMSR.

Key words: Ultrasonic atomization, Foam capture, Beryllium removal efficiency, Absolute humidity, Particle size

CLC Number: 

  • TL426