Flow Study Reactor Riser
Benefits of TRACERCO Diagnostics™ Flow Study of Riser
- Determines vapor and catalyst velocities and slip factor
- Provides information on how well the feed and catalyst are mixed in
the Riser
- Allows customers to modify distribution to help increase the efficiency
for the best conversion rate possible
Ideally catalyst and vapor should operate in a plug flow condition to
eliminate back-mixing, which can produce undesirable secondary reactions.
However, because of its greater density, the catalyst always flows up
the Riser slower than the vapor phase. This phenomenon is known as “catalyst
slip”. An ideal plug flow Riser should have a slip factor of 1.0.
Discrepancy from 1.0 or design expectation is often used as a scale of
the fluidization performance.
The slip factor can be determined by placing detectors on the Riser and
measuring the velocities of the vapor and catalyst via a TRACERCO Diagnostics™
Flow Study. The test involves two tracer injections, one for the vapor
phase and the other for the catalyst phase. The “Catalyst slip”
factor, which is the ratio of the velocity of the two phases in the Riser
is a useful tool for FCCU benchmarking and profiling. Measuring the slip
factor at different Riser elevations can help determine why a Reactor
Riser is performing below original design expectations.
Results from the distribution study will provide information on how well
the feed and catalyst are mixed in the Riser which affect’s the
conversion rate of the CAT Unit. With this information operations can
add/remove steam to modify the distribution to help increase the efficiency
to get the best conversion possible.
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