The downstream part of the riser is circulating fluidized particle circulation loop

The downstream part of the riser is circulating fluidized particle circulation loop. Mobile phase flow characteristics within the riser of a particle along the high gravity from low-end to high-pressure flow of the lower end, this approach has led to volatility in the flow stream state of diversity and flow processes. As part of a circulating fluidized bed riser particles circulatory system, usually installed with a valve for  Instrumentation ball valve  mass flow rate and control of a circulating fluidized bed, such as fluidized catalytic cracker (FCC) of renewable inclined tube slide valve and pending Health chute slide valve. However, the valve  Instrument needle valve  is different from the gas-solid flow valves generally fluid valve opening change will affect the flow pattern inside the standpipe valve before and after the gas-solid flow valve, causing the valve opening change the particle changes in flow rate is a nonlinear relationship, thereby affecting the regulatory effect of the valve. Riser on the particles flow through the valve orifice similar nesting.