Cold drum process
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In the cold drum process of coking plants, the arrangement of the electrostatic tar collector and the blower varies; in some cases the blower is placed in front of the electrostatic tar collector, while in other cases it is placed behind it. What is the difference between the two processes?
The gas drum cooling system is composed of direct-cooling towers, indirect-cooling towers, ammonia washing towers, electrostatic tar collectors, gas holders, gas blowers, desulfurization towers, etc
If the blower is placed behind the electrostatic precipitator, it is possible to reduce the amount of tar that reaches the blower. However, since the electrostatic precipitator operates under negative pressure, high sealing standards are required for it
Placing the electrostatic tar catcher in front of the blower results in negative pressure operation, which prevents the gas temperature from rising; as a result, the electrostatic tar catcher is unable to capture tar mist.
What was said upstairs is correct; some coking plants place the blowers at the end of all the equipment, using a full negative pressure recovery process, which allows the sealing issues to be resolved
Generally, an electrostatic precipitator is placed in front of the blower to ensure that the operating environment of the blower has a low level of tar.
Each has its advantages and disadvantages: Placing the electrostatic precipitator in front of the blower ensures that the operating environment of the blower contains low levels of tar； However, the electric precipitator is located in a negative pressure area, making it difficult to carry out replacement after maintenance, and the safety factor is not high enough behind the blower.
When the electrostatic tar catcher is placed in front of the blower, it operates under negative pressure, which helps prevent the gas temperature from rising; however, the electrostatic tar catcher is unable to capture tar mist
When placing the electrostatic precipitator in front of the blower, it is essential to ensure its sealing integrity, as this can reduce the amount of tar that reaches the blower. Placing it behind the blower is safer, but the heating of the gas after passing through the blower results in poor collection efficiency
I think it’s better to place it behind the fan; that makes maintenance easier
In our factory, the electrostatic precipitator is installed in front of the blower, and it works quite well; there is almost no acid tar in the saturated flow tank. The electrostatic precipitator has also been serviced by diverting the gas through a bypass, installing blind flanges behind the inlet valve and in front of the outlet valve, and then using nitrogen for cleaning and purging