What are the main causes of overflow tower accidents in chemical production desulfurization regeneration towers and what are the solutions?
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Causes and solutions for overflow accidents in regenerative towers, and how to manage them during operation?
The overflow accident in the desulfurization regeneration tower can be attributed to the following main factors: (1) Fluctuations in compressed air flow rate or pressure: Theoretically, less than 2 m3 of air is required to oxidize 1 kg of hydrogen sulfide; in practice, however, due to the need to float sulfur bubbles, the air supply rate to the regeneration tower is 100 m3/m2•h. If the compressed air pressure or flow rate fluctuates suddenly, especially if it increases abruptly, the amount of sulfur foam increases significantly, which can very easily lead to an overflow accident in the regeneration tower. (2) Fluctuations in the pressure or circulation flow rate of the desulfurization liquid pump: Sudden increases in pressure or flow rate can also cause overflow in the regeneration tower. (3) As the blending coal changed, its sulfur content increased significantly, leading to an increase in hydrogen sulfide levels in the gas. The amount of sulfur foam generated also rose abruptly, and since the level regulator failed to adjust in time, a large amount of this sulfur foam could not be discharged into the foam tank. In short, a comprehensive analysis is needed to identify the causes so that appropriate measures can be taken.
If the indicators are properly controlled, how can tower overflow accidents be avoided during human operation?
Human intervention can prevent tower overflow accidents, but it’s not clear exactly how to do this; I would appreciate some guidance from those who are more experienced!
The main reason is the significant fluctuations in factors such as the amount of air used for system regeneration, alkalinity, and the volume of gas fed into the tower; operations and load increases should be carried out at a steady pace to avoid such fluctuations in the system.
In fact, whether it is a desulfurization tower or a desulfurization regeneration tower, fluctuations in operation are the thing to be avoided the most; for manufacturing enterprises, it is crucial to ensure stability in operational conditions. So the key to solving the problem remains improving operational skills and reducing production fluctuations.
In addition to what was mentioned above, there is one more point to note: improper operation of the defoaming tube in the reaction tank (desulfurization liquid circulation tank) can also easily lead to overflow, especially when shutting it down – it must be done slowly!
The main reason is excessive air fluctuations, with the air volume changing rapidly; when the air volume suddenly increases, it is easy to fill the foam tank. Solution: It is best to control the pipeline modifications in the subsystem by using a separate air compressor during operation, so that the air pressure can be easily adjusted.