Gas Turbine Combustor Fuel Switching Dust Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge is to minimize the visualization of dust in the exhaust gas from gas turbines when switching from oil fuel to gas fuel, as existing methods can result in high dust density and visible emissions, which is undesirable for environmental and aesthetic reasons.
Innovation Solution
The solution involves switching the combustion from oil burning to gas burning by first starting gas burning in the main burner and then in the pilot burner, with controlled nitrogen gas purging and fuel injection to reduce dust generation, and optimizing the fuel switching logic to ensure efficient oxidation and reduced dust emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gas fuel injection amount is increased while reducing oil fuel injection amount during fuel switching, then the gas turbine can transition from oil burning to gas burning, but a large amount of dust is generated in the exhaust gas causing visible emissions
Solution Approach 1:
The patent applies preliminary action by introducing nitrogen gas into the combustion chamber before the fuel switching process begins. This preliminary nitrogen injection creates a controlled atmosphere that suppresses dust formation during the subsequent fuel transition from oil to gas, preventing visible emissions while maintaining the fuel switching capability
Solution Approach 2:
Nitrogen gas serves as an intermediary substance in the combustion chamber during fuel switching. The nitrogen acts as a mediator between oil fuel and gas fuel combustion, controlling the chemical reactions to minimize dust generation while enabling the transition between fuel types
2Reliability
If oil fuel is used for ignition and startup, then reliable ignition is achieved, but dust is generated during the transition to gas fuel combustion
Solution Approach 1:
The patent extracts the harmful dust generation aspect from the fuel switching process by introducing nitrogen gas that selectively suppresses dust formation while allowing the necessary fuel transition to proceed. The nitrogen removes the harmful byproduct without interfering with the core function of switching from reliable oil ignition to gas combustion
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 approach effectively minimizes dust in the exhaust gas, reducing its visibility and adhering to environmental criteria, while ensuring efficient operation and low NOx combustion.
Implementation Method 1
a combustor configured to burn the oil fuel and the gas fuel
Implementation Method 2
a nitrogen supply device configured to supply the nitrogen gas to the combustor
Data Source
AI summary
The gas turbine combustor and the operation method thereof are designed to minimize visualization of exhaust gas from the gas turbine upon switching of the gas turbine fuel from the oil fuel to the gas fuel. Upon switching of the combustion by the pilot burner from the oil burning to the gas burning, the gas fuel is supplied to the main burners so as to start the gas burning. Then the gas fuel is supplied to the pilot burner to start the gas burning.