Replaced with a new-type air preheater；adjusted key operational parameters and optimized process flow
Hot air outlet temperature increased from 190°C to 630°C
Dry gas calorific value rose from 1200 kcal/Nm3 to 1400 kcal/Nm3
Dry gas production per unit increased from 25,000 Nm3/h to 27,000 Nm3/h
Carbon conversion rate improved by 2 percentage points and cold gas efficiency increased by 7 percentage points
Gasification air consumption reduced by 2,000 Nm3/h
Annual coal savings per gasifier: 5,800 tons, saving 3.5 million yuan
