Case Study of Economic Operation in Heat and Power Cogeneration System Gridconnected of Papermaking Enterprises

The operation cost under "energy independence" mode of cogeneration system in a papermaking enterprise was analyzed in this paper, it has more cost compared to the "purchase power" mode. The annual savings of operating cost reached to 652,600 RMB based on the same raw material prices, and 1728 t standard coal can be saved (by equal value). The critical prize of coal between two modes was calculated about 520.23 RMB/ton. If the market price of coal above the critical coal, "purchase power" model is more economical, on the contrary," energy independence" model costs less.