Syngas Heating Value Control for Gas Turbine Stability
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Solution Overview
Problem
In gasification power generation systems using carbon-based fuels like coal, maintaining a stable heating value of syngas for the gas turbine is challenging, especially when power generation output fluctuates, leading to variations in syngas composition and potential combustion issues such as increased nitrogen oxide and carbon monoxide concentrations, flame instability, and equipment damage.
Innovation Solution
A control method that infers the syngas heating value at the gasifier outlet based on carbon-based fuel and oxidizing agent feed rates, corrects it using analytical data from sampled syngas, and accounts for time lags and pipe characteristics to set the heating value accurately at the gas turbine inlet, ensuring stable combustion by adjusting fuel and air flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the heating value of syngas is set to a fixed value for gas turbine control, then the control system is simple, but the real heating value may exceed or fall below the preset value leading to increased nitrogen oxide and carbon monoxide concentrations
Solution Approach 1:
The patent implements a feedback mechanism where the heating value of syngas is continuously inferred from gasifier operating conditions (carbon-based fuel feed rate, oxidizing agent feed rate, purge gas flow rate) and used to dynamically adjust the gas turbine control parameters. This closed-loop feedback ensures the heating value setting reflects real-time syngas quality, preventing harmful emissions while maintaining control system feasibility
Solution Approach 2:
The patent performs preliminary calculation of syngas heating value based on gasifier input parameters before the syngas reaches the gas turbine. By inferring the heating value from the carbon-based fuel feed rate, oxidizing agent feed rate, and purge gas flow rate, the system proactively sets appropriate control parameters to prevent combustion issues and harmful emissions
2Object-generated harmful factors
If the syngas heating value is dynamically adjusted based on gasifier operation state, then emission control is improved, but the control system complexity increases
Solution Approach 1:
The patent uses feedback from gasifier operating parameters (carbon-based fuel feed rate, oxidizing agent feed rate, purge gas flow rate) to continuously update the syngas heating value inference. This feedback-driven approach dynamically adjusts gas turbine control parameters, maintaining low emissions while avoiding excessive system complexity through efficient use of existing measurement data
Solution Approach 2:
The patent replaces complex physical measurement systems with a calculation-based inference method. Instead of installing additional sensors to directly measure syngas heating value, the system substitutes a computational model that calculates heating value from readily available gasifier operating parameters, significantly reducing system complexity
3Reliability
If purge nitrogen flow rate is increased to prevent pressure detection pipe blocking, then pipe reliability is improved, but syngas heating value decreases
Solution Approach 1:
The patent performs preliminary action by inferring the syngas heating value from the purge gas flow rate before the syngas enters the gas turbine. This advance calculation allows the system to account for the heating value reduction caused by increased purge nitrogen, and adjust control parameters accordingly to maintain proper combustion conditions
Solution Approach 2:
The patent implements feedback by continuously monitoring the purge gas flow rate and using it to update the syngas heating value inference. This feedback mechanism ensures that the gas turbine control system compensates for heating value changes, maintaining reliable pipe operation while optimizing combustion performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for precise adjustment of syngas quantity and air quantity to the gas turbine combustor, maintaining stable combustion and preventing issues like flame outages and equipment damage, even with fluctuating power generation output.
Implementation Method 1
gasifying carbon based fuel such as coal in a gasifier using oxygen or oxygen-enriched air as an oxidizing agent
Implementation Method 2
burning the obtained syngas as fuel in a gas turbine
Data Source
AI summary
The present invention relates to an operation control method for a gasification power generation system for gasifying carbon-based fuel such as coal in a gasifier using oxygen or oxygen-enriched air as an oxidizing agent, burning the obtained syngas as fuel in a gas turbine, driving the gas turbine by the syngas, driving a steam turbine by steam generated using exhaust heat of the gas turbine, thus executing combined power generation.