A study on adaptability of wide coal types was carried out around a 240 t/h tangentially fired cogeneration boiler. By analyzing the current operational status of the boiler conventionally designed for anthracite

the burner reforming scheme was proposed. The coal quality characteristics of the proposed bituminous coals were analyzed experimentally. The boiler parameter adjustment strategy of the modified bituminous coals was proposed

and the influence on the auxiliary machine and boiler system was also analyzed. On the basis of coal quality analysis and parameter adjustment

Fluent 16.0 software was applied to simulate the combustion process of different coals in the furnace. The results show that

after the conversion of anthracite to bituminous coal

the combustion in the furnace is in good condition

the center position of the combustion flame slightly elevates

and the flue gas temperature at the exit of the furnace is basically the same as that of the designed coal type. When the bituminous coal is burned

the CO concentration in the center of the furnace obviously increases

and the O2 concentration in the furnace wall area is relatively higher than that of the designed coal type. The flue gas velocity at the boiler exit slightly reduces

and the flue gas density does not change significantly. The research provides an effective method for wide coal type and wide load regulation of small and medium scale cogeneration boilers.