4.2　Technical Index of Blast Furnace Production

4.2.1　The blast furnace's annual average productivity，fuel ratio and coke ratio should be consistent with the requirements stated in Table 4.2.1.

Table 4.2.1　Designed Annual Average Productivity，Fuel Ratio and Coke Ratio of Blast Furnace

Notes:1　The above table excludes the designed indicators for special ore smelting.
2　The fuel ratio in the above table is valued for coke，coal powder and nut coke，but not considering reduction factor.
3　The coke ratio in the above table is valued including nut coke.

4.2.2　The annual operation rate of blast furnace should be designed as 97%.

The designed annual output of blast furnace shall be calculated with the following formula:

designed annual output of blast furnace（t）=effective volume（m3）×designed annual average productivity［t/（m3·d）］×designed annual operation rate×annual calendar days（d）…（Item 4.2.2）

4.2.3　The maximal capacity of blast furnace equipment shall be designed on the basis of normally designed annual average productivity and foreseen with the capacity of additional 0.1t/（m3.d）-0.2t/（m3·d）.The equipment capacity for blast furnace in volume of no less than（≥）2000m3 should be no larger than（≤）2.5t/（m3·d）.

4.2.4　The energy consumption，general heat value of energy and reduction factor of standard coal of ironmaking procedure shall be calculated in compliance with the relevant stipulations as stated in Code for Design of Energy Saving of Iron and Steel Industry（GB 50632）.The calculation result of unit consumption of ironmaking procedure shall be consistent with the requirements stated in Table 4.2.4.

Table 4.2.4　Energy Consumption per ton Hot Metal

Notes:1　The above table excludes the designed indicators for special ore smelting.
2　The power reduction factor for the above table takes 0.1229kgce/（kW·h）.