1. The combustion is changed from automatically adjusting to manually adjusting. 

2. According to the kinds of coal, strengthen the combustion adjustment. Namely keep suitable excess air coefficient, the primary air speed and air wind pressure shall be reduced as far as possible. The hearth negative pressure shall not be too big, ensure the uniform distribution of pulverized coal amount of each burner and reduce the pulverized coal fineness. 

3. Keep the boiler running under higher load. 

4. When necessary, support the combustion with oil.