The effect of pressure within the system on material velocity
Thread Content
For example, there is a bag filter in which the solid phase and gas phase are filtered; the gas phase is drawn away by the fan A at the top, while the solid phase is drawn away by the fan B at the bottom. If the speed of fan A is increased to raise the negative pressure in the system, with the speed of fan B remaining unchanged, will this slow down the rate at which the solid phase is removed?
What is the principle of a bag filter? What does \"fan outlet\" mean? Take a look at the previous picture; I don’t understand what you’re describing.
You need to understand where the motivation comes from. The force that drives the material comes from the pressure difference; the greater the pressure difference, the greater the force. It has nothing to do with absolute pressure
If the outlet of fan B is directly connected to the atmosphere, the negative pressure inside the bag increases, which means that the pressure drop required by the fan has to rise. If the speed of fan B remains unchanged, its air volume will decrease. As you described, the gas and solid phases are separated inside the bag; the solid phase is then transported by pneumatic means. An increase in the system’s negative pressure does not affect the efficiency of this separation process, and the amount of solid material that is separated remains unchanged. As a result, the air volume delivered by fan B decreases, while the concentration of the solid phase increases.
Theoretically, it’s declining more slowly, but in practice there is no significant change apparent!