Geothermal steam measurement systems
Venturi flow metering solutions with PLR compensation for steam applications
- Stable measurement of sub-saturated geothermal steam
- Continuous real-time flow measurement with steam quality indication
- Seamless integration with new or existing systems
- Low maintenance requirements
A reliable measurement of both steam quantity and quality is a major challenge for all geothermal power plants. As the steam is close to saturation or even wet, small deviations in the operating conditions or unrecognized process disturbances could cause condensation or liquid carry-over. Any incorrect measurement affects the plant control and jeopardize the lifetime of the turbine-blades.
The KROHNE geothermal steam measurement system is an evolution of the WGS-series Venturi-based wetgas systems, field proven in the Oil & Gas Industry. The system consists of a 6D extended Venturi tube with heated annular chambers, and a Virtual Flow Computer (VFC) for liquid over-reading correlation and monitoring of the Pressure Loss Ratio (PLR) which indicates a shift in the liquid content.
The system fully complies with International Standards and combines a field proven Venturi flowmeter design with a virtual flow computer by KROHNE to accurately measure both the steam flowrate and condition. The system enables close monitoring and alarming of possible liquid carry-over without the need for additional on-line steam quality analysers.
Highlights
- Real-time measurement with steam wetness indication enables real-time process control
- Measurement range; GVF > 90% or Lockhart Martinelli X < 0.3
- Standard sizes available from 2 … 48” (50 … 1200 mm), larger sizes available on request
- Pressure rating available in accordance to relevant standards
- NACE MR 0175 compliant and suitable for NGC’s and TDS’s
- Minimal permanent pressure loss
- Continuous online monitoring of PLR enables immediate safety measures in case of process issues, and enables turbine safeguarding
- Allows accurate monitoring of the complete dehydration process (separator, demister, condensate traps)
- Provides trending, alarm management, reporting and integration with plant management and control systems
- Extended Diagnostics
Typical applications
- Steam cycle in geothermal power plants
- Continuous steam integrity monitoring
- Geothermal steam measurement system for steam flow and quality
- Geothermal steam measurement in turbine steam line
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Flow computer for custody transfer (CT) measurement
- Cost effective solution due to modular hard- and software design
- Full colour graphical touch screen for maximum process transparency
- Easy operator access enabling time efficient maintenance
- Automatic Performance Monitoring extends recalibration interval
OPTIBAR DP 7060
Differential pressure transmitter for flow, level, differential pressure, density and interface measurements
- High performance DP transmitter with integrated line pressure measurement
- Measuring range: 30 mbar…16bar / 0.44…232 psi; Line pressure: up to 400 bar / 5800 psi
- Reference accuracy of ±0.065%
- 2-wire, 4…20 mA/HART®, FF, Profibus-PA, Bluetooth®
Venturi tube
Engineered primary element for DP flow measurement of liquids, gases and steam with the lowest residual pressure loss
- Machined or welded design (internally machined) according to EN ISO 5167, ASME MFC3
- Lowest residual pressure loss of all DP elements
- Only short inlet/outlet runs required
- From basic to special wet gas applications and high pressure conditions
OPTITEMP TRA-TF56
Resistance (RTD) temperature assembly for higher flow velocities and pressures
- Flange connection
- ASME-style, barstock thermowell with tapered tip
- -40…+600°C / +1100°F
Related solutions
Supervisory Control Cabinets
Complete solution for process control
- Provides control of the metering system, including validation of field instrumentation
- Installed in a safe area, typically in a control room or dedicated building
- Supplied in combination with new metering systems, or for an upgrade to existing systems
Related services
Consultancy & engineering for metering systems
From metrology concepts through to design and testing
- Consultancy regarding local and international metrology requirements and certifications
- Cost effective engineering concepts tailored to application and installation
- Detailed design of mechanical setup, instrumentation, E&I and software
- Site survey and feasibility studies for specific process or technical requirements
- Assistance during project execution
Start-up & commissioning for metering systems
On-site support by dedicated KROHNE engineers
- Onsite commissioning services for on- and offshore metering systems
- Consultancy during the implementation of systems using KROHNE and non-KROHNE products
- Assurance of smooth and continuous operations in the field
- Site acceptance testing (SAT) to verify the system is working according to requirements
System calibration & validation for metering systems
Additional diagnostics and monitoring to achieve optimal performance of the system
- KROHNE certified validation with full audit trail
- On-site or laboratory calibration of instruments
- Adjustments according to application requirements
- Uncertainty calculations with all parties involved
- Periodical inspection, including environmental and metrological certification
Operation & maintenance for metering systems
Support for on-going diagnosis and system health checks
- Maintenance contracts and service level agreements
- Pre-defined service rates and response times
- 24/7 Customer support and emergency helpdesk
- Periodic health checks and software updates
- Troubleshooting using a remote link or by an engineer on-site
Training for metering systems
Full range of workshops and seminars related to products and measurement solutions
- Basic principles of metering systems
- Individual training sessions for operational, engineering and maintenance personnel
- Customised project training and engineering background