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Benson® test rig

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Tried, tested and trustedThe Benson test rig is installed in an accredited laboratory in Erlangen, Germany. In operation since 1975, its main purpose is to investigate topics associated with the opera-tion and further development of Benson steam generators and heat recovery steam generators. Intensive research and development is especially being conducted in the field

of heat transfer, pressure drop and flow stability of two phase flows in evaporator tubes. This has led to the estab-lishment of the world’s largest database on heat transfer and pressure drop in evaporator tubes. Moreover, the test results help developing and validating the Benson design software.

Benson test rig

Ministry of Electricity and Energy, Egypt

Equipment of three combined cycle power plants

24 vertical triple-pressure Benson heat-recovery steam generators

Part of the megaproject designed to increase electricity generation in Egypt by 50 percent

Highly efficient and flexible combined cycle operation

Spray condenser

Test section

Trickle cooler

Main cooler

Reduction valve

Circulation pump

Piston pump

Pressurizer

Feedwater tank

Preh

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ain

hea

ter

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Technical data

System pressure 330 bar

Temperature 600° C

Mass flow 4 kg / s

Heat capacity 2,000 kW

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The test facility mainly comprises a water supply system, the object to be tested, a thermal pressurizer and a cooling system. If large mass flows are required for certain investi-gations, the test rig can be operated in recirculation mode. The thermal pressurizer is a unique feature of the Benson test rig and keeps the pressure in the system extremely sta-ble. This is a necessary precondition for reliable steady-state heat transfer measurements in the pressure range close to the critical pressure.

The physical phenomena and theoretical basis for the dynamic stability of two-phase flows have been investi-gated, understood and documented in the context of the Benson license. A test stand with tubes configured in paral-lel was installed in the Benson laboratory in Erlangen in 2014 for further investigation of the phenomenon. This

setup enables the reproducible generation and observation of dynamic instabilities in vertically configured heated tubes with a geometry typical for Benson evaporators under labo-ratory conditions for the first time in the world. The tests are currently being evaluated to further validate the pro-grams for dynamic stability simulation available at Siemens.

Database for heat transfer and pressure drop in evaporator tubes

SOFTWARE APPLICATION

DEFOS

Fired steam generator

Thermodynamic performance

STADE Pressure drop in single tubes

STADENET Flow distribution in thermohydraulic networks

WATHUN Detailed heat transfer analysis

DYNASTAB Dynamic flow stability

WATHAN Membrane wall strength

KRAWALHRSG

Thermodynamic & thermohydraulic analysis

DYNAPLANT Dynamic flow stability

DYNAPLANTBoth

Benson-specific control concepts

WATSEF Water/steam separator efficiency

Tube geometry

Heating

vertical

Tube orientation inclined

horizontal

Numbers of mesurements (07 / 2017)

Smooth

> 307,000

Rifled

> 285,000

uniform one side uniform one side Typical test parameters:

Pressure 25≤p≤280bar Heatflux 0≤q≤950kW/m2

Massflux30≤m≤2,500kg/(sm2) Tubeinnerdiameter8≤d≤50mm

Benson software

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Trademarks mention ed in this document are the property of Siemens AG, its affiliates or their respective owners.

Subject to change without prior notice. The information in this document contains general descriptions of the technical options available, which may not apply in all cases. The required technical options should there-f ore be specified in the contract.

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Siemens AG Power and Gas Division Freyeslebenstrasse 1 91058 Erlangen, Germany

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Dispo 05400 BR 10170.0 Article No: PGES-B10050-00-7600

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