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.
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
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
Resistance (RTD) temperature assembly for higher flow velocities and pressures