Gas Turbine Burner Lance with Diverting Fluid
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Solution Overview
Problem
Conventional burners struggle with using high-reactivity fuels like synthesis gas containing hydrogen and carbon monoxide, leading to inadequate intermixing with oxidizer gases, increased pollutant emissions, and potential hardware damage due to fuel concentration near the burner wall.
Innovation Solution
The burner is equipped with an introduction device that redirects the fuel flow using a diverting fluid, preventing fuel from impinging on the wall by deflecting it with an oppositely directed fluid flow, ensuring better homogenization of fuel and oxidizer gases, which can be oxidizer gas, steam, inert gases, or even fine water spray.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mass flow of fuel gas is increased to avoid hazardous flashback when using synthesis gas, then safety is improved, but fuel gas concentration near the burner wall increases leading to inadequate intermixing with oxidizer gas
Solution Approach 1:
A diverting fluid is introduced as an intermediary substance between the fuel gas and the burner wall. This diverting fluid redirects the fuel gas flow before it impinges on the wall, preventing direct contact and concentration of fuel gas near the wall while maintaining adequate intermixing with oxidizer gas, thus reducing pollutant emissions while preserving safety
2Productivity
If fuel is injected from conventional natural gas holes with increased mass flow, then fuel delivery is improved, but fuel gas concentrates near the burner wall resulting in inadequate intermixing
Solution Approach 1:
The diverting fluid acts as a mediator that modifies the flow field around the fuel injection holes. It redirects the high-mass-flow fuel gas away from direct wall impingement zones, creating a more uniform distribution of fuel and oxidizer gases and thereby improving mixing homogeneity while maintaining high fuel delivery rates
3Stability of the object's composition
If fuel gas flow velocity is increased to prevent wall concentration, then intermixing is improved, but flame stabilization in wall region occurs due to low flow velocities
Solution Approach 1:
The diverting fluid serves as a protective intermediary that prevents direct fuel gas contact with the burner wall. By redirecting the flow, it eliminates the conditions for flame stabilization in the wall region while maintaining adequate flow velocities for proper mixing, thus preventing hardware damage without compromising mixing quality
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 design enhances fuel and oxidizer gas intermixing, reducing pollutant emissions and preventing fuel concentration on the burner wall, thus improving combustion efficiency and safety when using high-reactivity fuels.
Implementation Method 1
an introduction device for introducing a diverting fluid which redirects the fuel flow before it impinges onto the burner wall
Implementation Method 2
the fuel gas emerging radially from the lance is entrained in the main flow direction of the oxidizer gas, thus resulting in the desired intermixing between the oxidizer gas and fuel gas
Data Source
AI summary
The present invention relates to a burner for a combustion chamber of a gas turbine plant. The burner includes a lance for introducing gaseous fuel into the burner. A shaft of the lance has at least one nozzle for introducing gaseous fuel into the burner. A main injection direction of the respective nozzle is oriented onto a portion of a burner wall. An introduction device for a diverting fluid is provided, which is designed for introducing a diverting fluid counteracting an impingement of the fuel flow on the burner wall.