Flue Gas Variable Orifice Valves
Flue Gas Variable Orifice Valves control the flow of flue gas, particularly in applications like FCCUs where pressure and flow rates can fluctuate. They are used to replace traditional orifice chambers, offering greater flexibility in controlling pressure and flow at varying operating conditions. By adjusting the orifice size, the valve can maintain a constant pressure drop across equipment while varying flow rates, improving safety and reliability.
Industry Challenge to Solve
The disadvantage of fixed orifices (Orifice Chamber) is that pressure control and/or sound attenuation is achieved only at a constant flow rate. However, since refineries operating conditions are seldom uniform and therefore experience variable internal flow rates and pressure fluctuations, a variable orifice design is highly advantageous to accomplish optimum results.
Our Solutions
- Provide a valve system to replace the orifice chamber that provides reliability to the flue gas system regardless of the process flowing conditions.
- Provide a valve system to increase safety to the overall operability of the FCCU
- Provide a flue gas valve system to control the velocities to eliminate sonic velocities which is a major cause of equipment failure and erosion issues
- Provide a valve that will control the flue gas pressure reduction process in all flowing process conditions to maintain constant Delta P across the equipment
Any changes in the process conditions will change the flowing characteristic of the flue gas through the DDFG Valve and orifice chamber.
These process changes effect the velocities and Delta P of the flowing media as they flow through the fixed orifice chamber plates (discs).
The results of changing the Delta P not only effects the orifice chamber but it also effects the DDFG valve located upstream of the orifice chamber.
When the Delta P changes, the velocities of the flowing flue gas will change also, causing severe erosion and damage to the orifice plates and the DDFG valve.
Results of Using the TapcoEnpro Variable Orifice Valve
The variable orifice valve will adjust its flapper (disc) as necessary so that the amount of flow through the outer fixed orifice plate holes will remain constant
The Delta P through the outer fixed holes will also remain constant, therefore, the velocities through these holes will remain constant and below sonic conditions
Nothing makes better sense than to trust your assets to the original inventors of the world’s most respected valve and control system…TapcoEnpro