In order to rapidly calculate the change of the unit economical index

this paper presents a set of the simplified calculation method for economic indexes of the extraction steam heating units

the heating units with the waste heat recovery device and the heating units with high back pressure circulating water. Moreover

the results calculated by this method were compared with that by the comprehensive thermodynamic calculation methods. The results show that

the heat supply quantity calculated by this simplified method has a very good consistency with that by the comprehensive calculation results

and the largest difference between them is only about 0.9% for unit power and heat rate. When the heat supply quantity is small

the difference will be further reduced

so it can meet the demands of engineering calculation very well. For heating units with high back pressure circulating water

the heat rate of the unit with electric feedwater pump is about 3 650 k J/(k W?h)

and that of the unit with steam feedwater pump is about 3 720 k J/(k W?h). Compared with the extraction steam heating units

the heat rate of the unit with high back pressure circulating water heating decreases more significantly.