30公厘以下的焦炭,通常叫做小焦炭或叫碎焦。这样的焦炭在每吨焦炭中要有30％左右。为了节約焦炭,我們在化铁方面除了采用增高爐身、加大風眼、提高鉄炭比等措施以外,同时还利用了小焦炭。我厂冲天爐的內徑是550公厘,風眼是兩排,風眼的断面积是爐膛截面积的14％。我厂鑄件都是小型的鑄件,重量只有0.2～20公斤,鑄件肉厚2.5～25公厘。这样就要求铁水溫度比較高一些,一般应該在1350℃左右。 Coke below 30 mm, usually called small coke or crushed. This type of coke should have about 30% of each ton of coke. In order to save coke, in addition to the use of iron and iron in addition to increasing the shaft, increase the wind eye, improve the carbon ratio and other measures, but also make use of small coke. I plant cupola diameter is 550 mm, the eye is two rows of winds, the eye area of ​​the cross-sectional area of ​​the furnace is 14% of the cross-sectional area. I plant castings are small castings, weighing only 0.2 to 20 kilograms, casting thickness of 2.5 to 25 mm. This requires a higher temperature of hot metal, the general should be about 1350 ℃.