EXERGY
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Transcript of EXERGY
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EXERGY
Real-time Efficiency Analysis for Power Stations
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GNS Science
The issue
• You need the ability to detect and diagnose efficiency problems in a thermal power station.
• You need your operators to be able to react to the diagnoses and restore the unit to a higher efficiency.
• This can add significantly to the operational profits of the station and result in lower CO2 emissions.
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GNS Science
EXERGY Real-time Efficiency analysis
Less Fuel = Less CO2 = More profit
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GNS Science
What is EXERGY?
EXERGY is a tool for detecting and diagnosing efficiency problems in thermodynamic processes
EXERGY saves operating costs. It has a unique ability to detect problems, diagnose causes and recommend remedial actions. It also allows operators to prioritise problems by providing an estimated cost per hour of the problem.
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GNS Science
What is EXERGY?
• EXERGY is the ONLY software available for continuous efficiency monitoring that is based on sound physics.
• EXERGY gives you continuous online efficiency monitoring
• EXERGY lets you pinpoint efficiency losses • EXERGY delivers instant reporting and diagnostics • EXERGY finds the root cause of problems, automatically
• EXERGY is the only software that calculates 2nd Law efficiency for your power station processes. It allows trending of component efficiencies and drill-downs to locate sources of problems .
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GNS Science
How EXERGY works: Background
• Plant efficiency management in the first instance is concerned with the Heat Rate, a 1st Law measure of efficiency.
• Ultimately a plant wants to produce as much output for the least expenditure of fuel.
• When plant efficiency deteriorates, either through incorrect operation, sudden failure in a component or through gradual loss of condition, the challenge is to find the cause and then cost the value of repairs.
• 1st Law measures of component efficiency are not useful for this analysis.
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GNS Science
How EXERGY works: Background
• In contrast, 2nd efficiency measures are ideally suited for this task.
• Exergy (availability) losses are additive (i.e. the total exergy loss for the plant is the sum of all the component losses), enabling attribution of the losses to plant components.
• The plant is modelled as a hierarchy of components, starting with entire plant. Losses can be tracked from top level of the plant to individual components.
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GNS Science
How EXERGY works: Background
• Entropy is additive• Entropy (and Exergy) is not a conserved quantity• Unit heatrate trend correlates exactly with Exergy loss
trend• These properties enable a quantitative method for
determining the root cause of heat rate excursions. • The resultant diagnostics procedure is valid both for
short term ( real time) and long term.
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GNS Science
Thermal Plant Efficiency
• The plant state at commissioning should be optimal
• Variance from optimal due to:
– Gradual deterioration of components
– Failure of components
– Sub-optimal/incorrect operation
• EXERGY detects the root cause of any efficiency loss.• Alarms when efficiency excursions occur with operating
recommendations
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GNS Science
EXERGY alarms
• Efficiency excursions result in alarms
• Alarms go to:
– Email if desired.
– Client PCs
– A central database
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GNS Science
Example Exergy alarm
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GNS Science
Exergy Alarm Analysis
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GNS Science
An example EXERGY audit: Bayeswater Station, NSW
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GNS Science
EXERGY audit as it happened, Bayeswater
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GNS Science
Exergy audit as it happened, Bayeswater
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GNS Science
Real Measurements, Bayeswater
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GNS Science
Overview of Exergy Components
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GNS Science
EXERGY installation
• Installs on MS Windows Server
• Interfaces with OsiSoft PI
– But custom interfaces can be used instead
– Reads instrumentation & writes back results
• Communicates with clients over TCP/IP network