Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (3): 30604-030604.doi: 10.11889/j.0253-3219.2017.hjs.40.030604

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Design and optimization for high temperature molten salts flow meter calibration platform

HUANG Nanshun1, HAN Lifeng2, ZHANG Fuchun2, CHEN Yongzhong2, LIANG Ziwei2, LIU Guimin2   

  1. 1. School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;
    2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China
  • Received:2016-08-10 Revised:2016-09-21 Online:2017-03-10 Published:2017-03-11
  • Supported by:

    Supported by Strategic Pilot Science and Technology of Chinese Academy of Sciences (No.XDA02010300)

Abstract:

Background: High temperature flow meter has been widely applied in the molten salt reactor, solar power generation, high temperature hydrogen production, etc. With the limitation of the material characteristics, the flow meter can only be used in a temperature below 535℃. To be applied in high temperature more than 650℃ environment, the ultrasonic waveguide plate had been modified to raise the temperature resistance. However, there is no standard flow meter or calibration equipment for flow calibration. Purpose: This study aims to design a stable and controllable molten salt flow platform for flow calibration with temperature less than 800℃, pipe diameter about 50 mm, measuring range 1-5 m·s-1, and calibration error less than 5%. Methods: Argon gas was used to control the velocity of the molten salt in the pipe connecting two tanks. The proportion-integration-differentiation (PID) closed-loop control system was employed to control the gas mass flow rate to achieve stable differential pressure and get more than 40-s calibration time. MATLAB simulation was conducted to get the optimization parameters and determine the control scheme of the calibration platform. Some factors affecting the stability of the flow rate are analyzed. Results: The optimized scheme, by setting an initial liquid level difference, has been proven to be capable of reducing the total consumption of molten salt (<0.1 m3) and driving gas, and reducing the requirements of the mass flow meter. After calculation, it can get 40-s stable molten salt flow, reached velocity of 4 m·s-1, and with a theoretical calibration error about 1.2%. Conclusions:The physical model of a high temperature molten salt flow meter calibration platform based on gas pressure control deduces a specific expression of the system flow rate. Optimized parameters provide reference for flow meter components selection.

Key words: Ultrasonic flowmeter, Flow calibration platform, MATLAB physical simulation, Molten salt loop

CLC Number: 

  • TL99