The impact of system pressure levels on the operation of the device
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Our system pressure can be controlled between 5-50 kPa depending on the load level. What effects do pressures that are too high or too low have on the stable operation of the device, as well as on temperature and reactions? Where will the obvious characteristics appear? (For example, when the pressure is 1 or 55 kPa)
If the load is normal, the pressure should be within the specified range; a low pressure indicates that the load is too small, which results in a slow flow rate and a decrease in temperature. The reaction is poor; excessive pressure leads to a high load on the blower, resulting in high power consumption. It’s difficult to adjust properly. A leak has occurred.
If high pressure is caused by a high load, it will result in a short residence time for the process gas, insufficient reaction time, and thus a reduced conversion rate. In addition, rotating equipment is under high load, as are cooling equipment, which can easily lead to leaks.
High pressure indicates that the device is operating under high load, resulting in a high space velocity in the reactor bed. (Space velocity refers to the volume of reaction gas that passes through a unit volume of catalyst per unit of time.) When the space velocity is high, more reaction gas passes through the catalyst per unit time, which reduces the time available for contact between the catalyst and the gas, leading to incomplete reactions and a decrease in conversion rate. It may also cause an excessive increase in the temperature of the bed； A lower space velocity means that the catalyst is in contact with the gas for a longer period of time, resulting in a more complete reaction and a higher conversion rate. However, if the space velocity is too low, the volume of the equipment must increase while the total amount of gas remains constant, and more catalyst is required as well, which is not economical. Therefore, the space velocity should not be too low; generally, an appropriate space velocity is determined through experiments for different types of catalysts. Our device is usually at 60 kPa.
I’ve learned that. Then why can’t the pressure for sulfur recovery be increased further? Isn’t what he usually designs micro-positive pressure? There should be plenty of room
The pressure in the sulfur recovery unit is usually maintained at around 50-60 kPa; if the pressure is too low, several people have explained this very clearly. The pressure cannot be too high, as this will lead to difficulties in the amine liquid regeneration process and in the transportation of acidic gases upstream. On the other hand, excessive pressure causes the pressure at the fan outlet to rise, which in turn requires the sulfur seal tank to be made very large; otherwise, the sulfur seal will frequently burst.