The coupling heating of various new high-efficiency heating technologies is one of the effective ways to realize cascade utilization of thermal energy and improve the efficiency of comprehensive utilization of resources for cogeneration units. A new high-efficiency coupling heating technology scheme is proposed. The energy efficiency evaluation methodology is established based on heat analysis method and exergy analysis method. The thermal efficiency

heat index

net coal consumption and heating coal consumption of pure condensing condition

steam extraction heating condition and coupling heating condition are calculated. The results show that

based on the heat analysis method

the thermal efficiency

heat index and net coal consumption of coupling heating mode are 19.59 percentage points higher

2.61 percentage points higher

and 76.23 g/(kW·h) lower than that of steam extraction heating condition

respectively. Based on the exergy analysis method

the exergy efficiency

exergy index net coal consumption

and coal consumption for heating of coupling heating mode are 3.61 percentage points higher

0.60 percentage point higher

21.62 g/(kW·h) lower

and 0.09 kg/GJ lower than that of steam extraction heating condition

respectively. The net coal consumption of steam extraction heating condition is contrarily higher than that of pure condensing condition. The maximum power supply condition is obtained by the comparison of the steam extraction conditions. The research results provide a reference for the application of new high-efficiency heating technology.