What are the hazards to coke oven production caused by fluctuations in the suction force in the main flue of the coke oven due to maintenance or accidents in desulfurization and denitration systems?
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The last edit to this post was made by angryant on 2016-7-3 at 19:25. Let me share my views first: 1. If it is reduced suddenly, it will cause smoke to come out of the chimney； 2. Remaining below the normal adjustment range for an extended period can affect the overall furnace temperature; in severe cases, the coke oven must be stopped from heating. The gas is released. 3. The presence of denitration equipment can affect the catalyst.
This post was last edited by angryant on 2016-7-3 at 17:36. A coke oven is a complex thermal furnace with high thermal inertia; the coking process requires that its temperature and pressure fields remain continuous and stable during operation. Any unstable condition should be addressed promptly; in some dangerous situations, safety interlocks must be considered during design to cut off the gas immediately and ensure production safety. Under normal conditions, the pressure field of the thermal system composed of coke ovens, flues, and chimneys is highly stable. The suction force generated by the chimneys itself is what keeps the combustion system of the coke ovens operating steadily, and these chimneys also possess a certain self-regulation capability; in cases where operating conditions do not change significantly, they can help maintain balance. At present, desulfurization and denitrification processes have been put into use in some enterprises, but their safety and stability directly affect the operation of coke ovens. Due to the lack of mature experience and practical examples available for reference, any issues that arise can have unpredictable impacts on production safety. The possible scenarios are as follows (for reference only): 1. Fluctuations in the overall flue draft can directly affect the supply of heating gas and air to the coke oven, especially the supply of air (which is drawn in by negative pressure); changes in the air volume can cause unpredictable changes in the combustion conditions within the vertical flues ； 2. Changes in the amount of gas and air supplied for heating, as well as changes in the combustion condition, cause unpredictable variations in the temperature field within the vertical flues of the coke oven ； 3. Changes in the temperature field cause corresponding changes in the pressure field within the vertical flues of the coke oven (the temperature field and pressure field influence each other) ； 4. The system composed of coke oven flue chimneys experiences a series of unexpected changes; the heat distribution within the system also changes and tends to shift towards the rear. Severe consequences: The most serious consequence is the entry of large amounts of flammable gas into flues and chimneys, and an explosion can occur once those gases reach their explosive limit! !
In mild cases, black smoke is emitted; in severe cases, explosions can occur. A coking plant in the vicinity exploded due to insufficient suction in its flue, resulting in the chimney being destroyed over 20 meters high. In fact, adding a set of actuators and an online linkage can help avoid this problem.
Thank you. Currently, some operators simply do not believe in the possibility of an explosion. I don’t know the severity of the situation.
How is the operation of desulfurization and denitrification projects that have already been bid for in China at present?
Where exactly? Is it because the original chimney wasn’t set up as a hot standby, or is there some other reason?
The reasons are complex; it depends on the specific situation
Our company has just carried out the desulfurization and denitration project, which is still under construction