Introduction  Demister is an important equipment in wet desulfurization system. It is generally installed on the top of desulfurization tower to capture gypsum droplets entrained in flue gas after desulfurization, so as to reduce the probability of "gypsum rain" and reduce the damage of "gypsum rain" to surrounding equipment, facilities and buildings.

  Methods  This paper mainly introduced the structure and characteristics of ridge mist eliminator and water droplet like tubular mist eliminator, analyzed the causes of collapse of tubular mist eliminator in thermal power plant with practical cases, put forward practical improvement measures, and accumulated technical experience, so as to improve its safety and stability.

  Result  The actual monitoring data show that the technology of super low emission in thermal power plants has advantages and advanced nature, and has a wider application prospect and value, so as to effectively enhance the reliability of the desulfurization system.

  Conclusion  Provide reference value and research direction for subsequent transformation units or relevant technicians, so as to effectively ensure the economic and social benefits of relevant technological transformation.