Reasons for the presence of long graphite inside the carbonization chamber

The longer the coking time, the less graphite there is; the shorter the coking time, the greater the amount of gas produced, and thus more graphite is present.

Upvote the post above – that’s mainly the reason.

If the standard temperature is too high, graphite may form even if the coal is not loaded up to the coal line

The reasons can be summarized as follows (in my opinion): 1. The space above the furnace is large, which results in high temperatures in that area; the chemical compounds present in the coal powder and gas are heated to high temperatures in this space, causing them to carbonize and form carbon particles, which eventually turn into graphite； 2、Inadequate coal loading management leads to insufficient coal loading, uneven coal distribution, or insufficient bulk density, thereby increasing the concentration of coal powder in the space above the furnace. 3. The rising pipe or bridge pipe is not unobstructed, resulting in high resistance and causing the raw gas to remain in the carbonization chamber for an excessive length of time, thereby undergoing carbonization. This is just my personal opinion for reference only; I hope those with more experience can give me some guidance!

In short, the formation of graphite is closely related to the high temperature in the furnace roof area (for example, a low coal level and an overly high standard temperature), and it is also associated with the residence time of raw gas in the carbonization chamber! (For example: inadequate management of the “three connections and one flexibility” requirement.) Note: Three connections and one flexibility: connection to the burner, connection to the rising pipe, connection to the gas collection pipe, and flexibility in adjustment

Reply to 6# Cup of Wine: What was added above is very thorough and makes sense!

Reply 5# *aofengyunyin is absolutely correct.

The formation of graphite in the carbonization chamber is due to the carbonization reactions that occur in coke oven gas; for example, methane can decompose at high temperatures to produce hydrogen and carbon (graphite). Similar reactions can also occur with other alkanes and alkenes

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