Under high speed preheat in blast furnace and gasification in iron-bath for smelting reduction the pyrolysis of pulverized coal injection is the first important stage.
高炉喷吹煤粉和熔融还原铁浴粉煤气化等高速加热条件下，快速热分解是第一步。
2
The primary industry has stronger effect for the CO2 emission reduction than the tertiary industry in the firststage;
对于减排作用，第一阶段是第一产业比第三产业强；
3
The results show that the temperature reduces fast at firststage, because of the larger difference between blade and air. Then, the temperature reduction rate decreases slowerly, in cooling process.