ROSEMOUNT 3095
FOOD & BEVERAGE
Soybean Oil Refiner Improves Carbon-to-Steam
Ratio Using Multivariable Flow Transmitters
RESULTS
• Natural gas and steam flow accuracy improved to 1%, enabling
automatic control
• Reduction in steam waste
• Installation costs reduced by 30%
• Reduced leak points by 30%
APPLICATION
Natural gas and steam measurement in hydrogen reformers
Application Characteristics: Soybean oil processing. The reformer
produces hydrogen, which is used to hydrogenate soybean oil.
CUSTOMER
Large Midwest Soybean Oil Refiner
CHALLENGE
In soybean oil processing, hydrogen is used to hydrogenate oil and is
manufactured by combining steam and natural gas in a hydrogen reformer.
The ratio of steam-to-carbon from the entering gas mixture is critical to
prevent carbon formation on the catalyst and to maintain the efficiency of
the hydrogen reformer. A ratio above the defined set point will waste
steam, while a ratio below the set point will wear out the catalyst. Reliable
natural gas and steam readings are needed to stabilize steam-to-carbon
ratios. Fluctuating flow rates force hydrogen reformers to operate in
manual mode, causing the plant to run the steam-to carbon ratio above
the set point to preserve the catalyst, which uses excess steam.
Providing accurate and reliable steam and natural gas flow readings was
the challenge. A traditional flow installation configured to compensate for
density variations required three separate transmitters - one for differential
pressure, one for static pressure and one for temperature. The signals from
all three transmitters are sent to the control system where the mass flow
calculations were performed. This practice adds additional costs and
provides suboptimal performance. Just as significant as the pressure and
temperature (density) related effects are the effects of changing orifice
flow coefficients, which affect bias error and efficiency. These effects, if not
corrected, can lead to errors between 2 and 5% of flow rate.
For more information:
www.rosemount.com
© 2006 Rosemount Inc. All rights reserved
The improved installed
performance from the 3095
increased flow stability and
accuracy, enabling tight
control of the carbon to steam
ratio.
FOOD & BEVERAGE
SOLUTION
Steam and natural gas flows are each measured with one Rosemount 3095
MultiVariable™ Transmitter with a Rosemount 68 RTD sensor. The 3095
transmitter provides full dynamic compensation, eliminating bias errors
and giving a mass flow rate accuracy of 1%. The improved installed
performance from the 3095 increased flow stability and accuracy, enabling
tight control of the carbon-to-steam ratio. The result allowed the operation
to move from manual mode to automatic control, which reduced steam
waste and freed up the operators to work on others tasks.
In addition to improved performance, the 3095 Multivariable Flow
transmitter combines the differential pressure, static pressure and
temperature measurements into a single device on one twisted pair of
wires, reducing total installed cost by 30% and potential leak points by 30%.
Rosemount 3095 MultiVariable™ Mass Flow
Transmitter
Traditional
Installation
3095
RESOURCES
Emerson Process Management Food and Beverage Industry
http://www.emersonprocess.com/foodandbeverage/
Rosemount 3095 MultiVariable™ Mass Flow Transmitter
http://www.emersonprocess.com/rosemount/products/flow/
m3095mv.html
The Emerson logo is a trade mark and service mark of Emerson Electric Co.
Rosemount and the Rosemount logotype are registered trademarks of Rosemount Inc.
All other marks are the property of their respective owners.
Emerson Process Management
Rosemount Division
8200 Market Boulevard
Chanhassen, MN 55317 USA
T (U.S.) 1-800-999-9307
T (International) (952) 906-8888
F (952) 949-7001
www.rosemount.com
Emerson Process Management
Heath Place
Bognor Regis
West Sussex PO22 9SH,
England
T 44 1423 863121
F 44 1423 867554
For more information:
www.rosemount.com
00830-0400-4716, Rev AA
Emerson Process Management
Emerson Process Management Asia Pacific
Private Limited
1 Pandan Crescent
Singapore 128461
T (65) 6777 8211
F (65) 6777 0947
[email protected]