Reasons for the high oxygen content in coke oven gas
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Dear friends, our 1.3 million-ton coke oven has been put into normal operation, but the oxygen content in the coke oven gas often reaches 2%. What could be the reason for this?
Do you produce methanol, and do you use high-pressure ammonia water for dust removal?
The coke oven gas generated at present is being used to light lanterns; subsequent projects have not yet been launched. Will high-pressure ammonia water be used for dust removal?
This post was last edited by hao101029 on 2012-6-5 at 23:29. The airtightness of various parts in the new coke ovens is relatively lower compared to those in older ovens. At present, you should increase the space temperature and the pressure in the gas collection pipes appropriately; use coal with high volatility to facilitate the formation of graphite as quickly as possible. Additionally, it is necessary to improve the airtightness of the oven body during thermal repairs and adjust the edges of the oven doors. Attention should also be paid to ensuring proper sealing of all pipes, valves, flanges, etc. Another important aspect is the use of high-pressure ammonia water for dust removal – the pressure and duration of its use must be carefully controlled, as this is a key factor in regulating impurity levels
If the oxygen content in the gas is high, you need to determine your sampling location first. If the sample gas is taken behind the fan, the oxygen content will be high. The reason for this high oxygen content could be leaks in the negative-pressure pipelines or equipment, which allow air to mix with the gas. Additionally, it is important to check whether the pressure in the gas collection pipe is around 150 Pa; if the pressure is negative, it will further increase the oxygen content.
Thank you all for your guidance; we will promptly make the necessary corrections based on the situation.
Observe the pressure in the gas collection pipes during coal loading and coke pushing, as the sudden entry of high-pressure ammonia water into these pipes causes severe disturbances; in serious cases, it can affect other components as well and lead to coupled vibrations. Suddenly shutting off the high-pressure ammonia water flow can likely result in negative pressure in the gas collection pipes, thereby increasing the oxygen content in the gas. At present, the issue of controlling pressure in the gas collection pipes is a common problem. We are currently building a ramming furnace with 5.5-meter-long double gas collection pipes, no smoke guiding system, and high-pressure ammonia water spraying. Those who have effective methods for controlling the gas collection pipe pressure are kindly asked to share their insights