Venturi Fuel-Air Mixing With Diffuser Plate for Quiet Uniform Combustion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fuel-fired heating appliances suffer from uneven heating distribution, high noise levels during fuel/air mixture creation, low fuel/air mixing efficiency, and excessive NOx emissions due to suboptimal combustion processes.
Innovation Solution
A specially designed combustion system featuring a venturi-based primary fuel/air mixing structure with a sound-attenuating chamber and a secondary mixing structure, along with a perforated diffuser plate, enhances fuel/air mixing, reduces noise, and optimizes combustion efficiency by ensuring uniform temperature distribution across heat exchanger tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional fuel/air mixing structures are used, then the device complexity is low, but noise level is high and fuel/air mixing efficiency is poor
Solution Approach 1:
A sound-attenuating chamber is introduced as an intermediary component between the fuel/air mixing process and the external environment. This chamber captures and attenuates noise generated during mixing while allowing the mixing process to continue, thus reducing noise without fundamentally changing the mixing mechanism itself
Solution Approach 2:
The venturi structure modifies flow parameters (velocity, pressure) of the air stream to optimize fuel/air mixing. By creating a venturi effect with specific geometric parameters, the system enhances mixing efficiency through controlled parameter changes rather than complex mechanical means
2Ease of manufacture
If conventional fuel/air mixing structures are used, then the device complexity is low, but fuel/air mixing efficiency is low
Solution Approach 1:
The system uses pneumatic principles through the venturi structure to achieve fuel/air mixing. The venturi creates pressure differential and velocity changes that actively mix fuel and air without mechanical mixers, maintaining simplicity while improving mixing efficiency through fluid dynamics
Solution Approach 2:
By optimizing the venturi geometry parameters (throat area, inlet/outlet areas, length), the system controls flow velocity and pressure distribution to maximize fuel/air mixing efficiency. Parameter optimization allows efficient mixing without increasing structural complexity
3Device complexity
If conventional combustion processes are used, then the device complexity is low, but NOx emissions are high
Solution Approach 1:
The combustion process parameters (temperature, oxygen concentration, residence time) are optimized through the designed combustion chamber geometry and fuel/air mixture control. By controlling these parameters, particularly maintaining lower peak temperatures and optimized oxygen-fuel ratios, NOx formation is reduced while keeping the combustion process relatively simple
4Device complexity
If conventional heat exchanger configurations are used, then the device complexity is low, but temperature distribution is non-uniform
Solution Approach 1:
The heat exchanger tube array is configured with specific spatial arrangements and orientations to achieve uniform temperature distribution. Different regions of the heat exchanger are designed with appropriate local characteristics (tube spacing, orientation, length) to ensure even heat exposure from the combustion gases, addressing temperature uniformity through localized design optimizations
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
The solution achieves improved fuel/air mixing, reduces noise and NOx emissions, and ensures uniform temperature distribution across heat exchanger tubes, enhancing the overall efficiency and performance of fuel-fired heating appliances.
Implementation Method 1
A specially designed combustion system featuring a venturi-based primary fuel/air mixing structure
Data Source
AI summary
A fuel-fired furnace incorporates specially designed fuel/air mixing and combustion structures. The fuel/air mixing structure is of a mixing sound-attenuating design and comprises a venturi having a perforated sidewall portion and being surrounded by a noise-damping housing chamber communicating with the interior of the venturi via its sidewall perforations. During use of the mixing structure, air is flowed through the venturi in a swirling pattern while fuel is transversely injected internally against the swirling air. The combustion structure comprises a burner box housing into which the fuel/air mixture is flowed, combusted, and then discharged as hot combustion gas into and through the heat exchanger tubes. The fuel/air mixture entering the burner box housing initially passes through a non-uniformly perforated diffuser plate functioning to substantially alter in a predetermined manner the relative combustion gas flow rates through the heat exchanger tubes.