Abstract:

After ultralow emission modifications for power plants, chimney anticorrosion and ‘white smoke’ come out due to the cancellation of gasgas heater (GGH).Most of the power plant will add a lowlow temperature flue gas heat exchanger (MGGH).However, for reasons of design, installation and so on, there will be MGGH leakage during operation, which will cause ash accumulation and increase of resistance, short circuit  of electrostatic precipitation, dry ash removal system blockage and so on. Serious leakage will even affect the discharge of smoke and dust. It analyzes the reasons for the leakage of MGGH, and formulating countermeasures which provide reference for the relevant problems.

Key words:

ultralow emission, lowlow temperature flue gas heat exchanger, gasgas heater, chimney anticorrosion, leakage；countermeasure