Aim at the problem that auxiliary power consumption rate dramatically increased after the modification of capacity expansion of electric induced draft fan in a pure condensing generator with large unit capacity and heating demand

a heating system combining steam driven induced draft fan and heating demand is put forward in this study. This system can solve the problem that the output of electric induced draft fan is insufficient due to the capacity expansion of environmental protection facilities. Besides

this system can increase the heating capacity

which achieves the comprehensive cascade utilization of steam energy and significantly decreases the auxiliary power consumption and energy consumption. Moreover

this system has been applied to the 2×630 MW supercritical unit of coal-electricity integrated corporation limited of Guodian Xingyang Power Plant. The results show that

after the modification

during the non-heating period the coal consumption rate

auxiliary power consumption and comprehensive coal consumption are decreased by 0.435 g/(k W·h)

1.35% and 4.485 g/(k W·h)

respectively. During the heating period

the coal consumption rate

auxiliary power consumption and comprehensive coal consumption are decreased by 4.35 g/(k W·h)

1.7% and 9.45 g/(k W·h)

respectively. 5 220 tons of standard coal are saved each year

more than 44 million k W·h of on-grid electricity is added

and the annual earnings of energy-saving and multi-generation yield are about 10.914 million yuan. Therefore

the energy saving effect and economic benefits are remarkable.