Analysis of plasma parameters in annulus of parabolic trough solar receivers based on spark discharge and emission spectrum.

The vacuum failure of the receivers will lead to a significant increase in its heat loss, the decline of its vacuum performance and the considerable loss of the whole solar thermal power generation system. This paper presents a method for measuring the vacuum performance of parabolic trough solar receivers based on spark discharge and emission spectroscopy. During discharge, the emission spectrum is detected when combined with the most common residual gases in the annulus of receivers: hydrogen and nitrogen. The emission spectrum calculates the electron temperature and electron density during discharge. The results show that the emission spectrum during discharge can be well detected by this method. In addition, the electron temperature and electron density during hydrogen and nitrogen discharge can be calculated through the emission spectrum obtained from the experiment, which can better understand the actual situation inside the annulus of receivers and provide reliable experimental results for improving the research of residual gas in the annulus of receivers. [ABSTRACT FROM AUTHOR]