Burner Forced Vibration Combustion for NOx Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for reducing nitrogen oxides (NOx) emissions, such as forced vibration combustion, do not achieve practical NOx reduction effects.
Innovation Solution
Periodically changing the flow rate of at least one of the fuel fluid and oxidizing agent fluid, while also adjusting the oxygen concentration in the oxidizing agent, to enhance NOx reduction through forced vibration combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If forced vibration combustion is used to reduce NOx, then NOx reduction is partially achieved, but the reduction effect is not practical enough
Solution Approach 1:
The patent applies periodic action by oscillating the flow rates of fuel and oxidizing agent at specific frequencies (0.1-100 Hz) to create cyclic rich-lean combustion zones. This periodic variation in flow rates causes corresponding periodic changes in combustion intensity and temperature, which effectively reduces NOx formation by limiting the time at high temperatures while maintaining overall combustion efficiency
Solution Approach 2:
The patent changes multiple parameters simultaneously including flow rate ratios, oscillation frequencies, and oxygen concentrations. By adjusting these parameters within specific ranges (e.g., oxygen concentration 21-100%, frequency 0.1-100 Hz), the system achieves practical NOx reduction effects that were not obtained by previous single-parameter approaches
2Object-generated harmful factors
If flow rate of fuel and air are periodically changed to achieve forced vibration combustion, then temporal thick and thin combustion is carried out, but NOx reduction effect remains insufficient
Solution Approach 1:
The patent introduces dynamic control of combustion parameters by continuously oscillating flow rates rather than using static rich-lean zones. This dynamic approach allows the combustion system to adapt continuously, creating moving rich-lean zones that enhance mixing and combustion completeness while reducing NOx, thereby maintaining productivity
3Object-generated harmful factors
If oxygen concentration in oxidizing agent is adjusted along with flow rate, then forced vibration combustion is enhanced, but system complexity increases
Solution Approach 1:
The patent uses a single control system that simultaneously manages multiple parameters (flow rates and oxygen concentration) through coordinated oscillation. This multi-functional control approach achieves enhanced NOx reduction without requiring separate dedicated systems for each parameter, thereby limiting the increase in overall system complexity
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 significantly reduces NOx emissions, providing practical and effective NOx reduction for burner systems, applicable to both new and existing heating furnaces.
Implementation Method 1
there is a method (below, it is called forced vibration combustion) in which flow rate of fuel, and air which is an oxidizing agent and the like are periodically changed
Implementation Method 2
periodically changing the flow rate of at least one of fuel fluid and oxidizing agent fluid which are supplied to a burner while periodically changing the oxygen concentration in the oxidizing agent fluid to make forced vibration combustion
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The object of the present invention is to provide a method for burning a burner which has NOx reduction effects and has practical value, and a device therefore; the present invention provide A method for burning a burner in a heating furnace including a step of: periodically changing at least one of a flow rate of a fuel fluid and a flow rate of an oxidizing agent fluid which are supplied to the burner while periodically changing an oxygen concentration in the oxidizing agent fluid, thereby an oxygen ratio which is calculated by dividing an amount of oxygen supplied by a theoretical necessary amount of oxygen is periodically changed, and the periodical change of the oxygen ratio is made different from the periodical change of the oxygen concentration to cause combustion in periodically vibrational conditions.