Hot standby gas volume for coke oven chimney
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Knowing the height and diameter of the chimney in a coking plant, how to calculate the required amount of hot standby gas
Could you be more specific? Or information on this topic would also work
Based on the heat dissipation through the chimney, the amount of heat carried away by the flue gas is calculated; this amount varies depending on the weather conditions.
In coke ovens, there are many waste heat boilers and fans whose flue gas exit temperature is around 160 degrees; the flue gas then enters the desulfurization tower before being discharged. By installing an air preheater behind these waste heat boilers and fans to heat the air before it enters the chimney, could this be used as a backup heating source for the chimney?
Now many coking plants have installed waste heat boilers and desulfurization equipment; the flue gas at 160 degrees Celsius after passing through the fans is cooled before entering the desulfurization tower. The chimneys are no longer needed, and many facilities want to keep the chimneys warm as a backup, to see if this 160-degree flue gas temperature can be utilized
This requires calculating the amount of hot backup air needed for the chimney in order to determine whether to use it or not
First, we need to figure out what hot standby means Can it be understood that once the chimney is in use, the required operating conditions will be met, that is, there will be sufficient suction at the base of the chimney? If that is the case, it is necessary to determine the suction value at the base of the chimney under normal operating conditions; furthermore, the flue gas temperature must not be lower than the dew point temperature, after which calculations are carried out based on heat balance and buoyancy. It’s estimated that a smoke flow of 160 cannot achieve the suction level during normal operation! !
What if hot air is used to heat the chimney? So there’s no need to worry about dew point corrosion, right? The main consideration is the minimum suction force that the chimney must have in order to prevent safety and environmental issues when there is a power outage across the entire coking plant. If the chimney lacks this suction force, and a small amount of gas enters the coke ovens (or there is leakage), could that pose a safety risk? Therefore, the chimney needs to have a minimum level of suction force so that the entire flue gas system can remain in flow and be discharged through the chimney, thereby avoiding safety and environmental problems