Tru-CAT™ Scan Reactor Riser
TRU-SCAN® results can identify the size of the expansion
zone providing details on unit efficiency
In FCCU’s the cracking reactions take place in a vertical
pipe, or riser. Heavy oils are injected into a stream of hot
regenerated catalyst at the base of the riser. The feed
injector technology has advanced from being a centrally
mounted pipe stub to several complex spray nozzles
mounted around the riser. At times the injection system
cannot generate the perfect mixture of catalyst particles and
hydrocarbon vapor.
A TRU-SCAN® of the Riser can be used to evaluate the
performance of the injection system. Results from a Riser
TRU-SCAN® will provide a catalyst density profile down the
length of the Riser. Scan results will provide information on
the length of the expansion zone where the hydrocarbon
mixes with the catalyst and cracks.
Tru-CAT™ Scan of Reactor Riser
Benefits of Reactor Riser Tru-CAT™ Scan
- Study the effect of steam injection on fluidization
- Determine the uniformity of distribution between the
catalyst and feed
- Identify flow inefficiencies such as catalyst maldistribution
- Determine if a nozzle is plugged or fouled
Poor fluidization or poor mixing of the catalyst and oil
cause localized variances in the oil-to-catalyst ratio and
cracking reactions. Over-cracked portions of the feed
generate low-value light components, while at the same
time the under-cracked portion produces more residues.
While a TRU-SCAN® provides a vertical density profile
down the height of the Riser, a Tru-CAT™ Scan study is
performed at a fixed elevation or Riser cross-section to
generate a detailed cross-sectional density profile of the
Riser showing flow distribution. A Tru-CAT™ Scan of the
gas-oil feed zone allows the affect of nozzle performance on distribution to be studied.
An economical way to determine hydrocarbon distribution
at the mixing zone can be attained by performing a Tru-Cat™ Scan if the Riser geometry and unit access allow
for scan set-up. A Tru-CAT™ Scan is often used to
evaluate changes in design and operation of feed
injection or lift steam nozzles. Scan results can determine
if a nozzle is plugged or fouled.
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