Turbine Transient Emission Temperature Control
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Solution Overview
Problem
Gas turbine systems face challenges in controlling emissions and preventing transient operability issues during transitions between normal and cold load paths, leading to excessive carbon monoxide emissions and potential blowouts.
Innovation Solution
A processor-based control system that determines a carbon monoxide setpoint and applies temperature control to manage transitions between normal and cold load paths, adjusting inlet guide vane control loop gains to maintain a higher firing temperature and minimize exhaust temperature swings, thus reducing transient issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the control system transitions from normal load path to cold load path, then emissions temperatures are reduced, but transient operability issues occur including excessive carbon monoxide emissions and potential blowouts
Solution Approach 1:
The control system applies preliminary action by anticipating transient conditions during load path transitions and proactively adjusting the firing temperature setpoint and inlet guide vane control loop gains before the transition completes. This prevents excessive carbon monoxide emissions and potential blowouts by maintaining appropriate temperature levels throughout the transition process, not just after it completes.
Solution Approach 2:
The system employs dynamics by making the inlet guide vane control loop gains variable rather than fixed. The gains are adjusted dynamically based on the transition state between normal and cold load paths, allowing the control system to adapt to changing conditions and maintain stability while reducing emissions temperatures.
2Productivity
If the control system adjusts parameters during transient periods, then power output requirements are met, but emissions control becomes difficult
Solution Approach 1:
The control system uses feedback by continuously monitoring the actual firing temperature and comparing it to the adjusted setpoint during transient periods. The inlet guide vane control loop gains are modified based on this feedback to maintain proper temperature control, ensuring both power output requirements are met and emissions remain controlled during transitions.
Data Source
AI summary
In one embodiment, a system is provided. The system includes a turbine control system, comprising a processor. The processor is configured to receive an input for transitioning between a normal load path (NLP) of a turbine system and a cold load path (CLP) of the turbine system. The processor is additionally configured to determine a carbon monoxide (CO) setpoint based on the input. The processor is further configured to apply a temperature control based on the CO setpoint, wherein the normal load path comprises higher emissions temperatures as compared to the cold load path.