Acid production from smelting flue gas: The effect of flue gas temperature on pressure
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Acid production from smelting flue gas: During normal operation, the temperature of the flue gas as it enters the acid production system (i.e., the first stage of the process) is between 270 and 300 degrees. In production, the negative pressure at the outlet of the sulfur dioxide fan (with a rotation speed of 4200 revolutions per minute) is generally between 6.0 and 6.6 MPa. When the system is restarted after maintenance shutdowns (the shutdown duration is usually 8 hours), the negative pressure at the outlet of the sulfur dioxide fan (still at 4200 revolutions per minute) is between 5.0 and 5.6 MPa. At this point, the temperature of the flue gas entering the acid production system is usually below 240 degrees. With the fan’s rotation speed remaining unchanged and no change in the system resistance, why is the negative pressure at the fan’s outlet significantly lower after restart compared to during normal operation? ? ? Additional note: There is no air leakage in the purification system.
Is the fan outlet under negative pressure? At the fan inlet, right?
The temperature at the front of the system is low; when the volume of gas is small, the resistance is low, and thus the inlet pressure is low.
The unit of pressure should be kPa, right?
What does an outlet negative pressure of 6 megapascals mean?
When driving, the temperature of the gases in the equipment and flues is low, resulting in a higher density. With the same amount of work done by the fan, it is difficult to move these gases, which is why the negative pressure displayed is low.
The negative pressure at the fan outlet is in megapascals as well, right? You’re not wrong! At low temperatures, the gas density is low; you can see that the pressure changes are also different from those under normal conditions
One is the influence of flue gas temperature, and the other is that the valve position of the conversion bypass valve is different at the start of operation.
The system resistance is different at the beginning of driving compared to later in the drive