Variable Impingement Angle Injector Mixer for Gasification Reactors
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Solution Overview
Problem
Conventional gasification systems face inefficiencies in mixing fuel and oxidant reactants due to limitations in the Rupe Efficiency Elverum-Morey (EM) number, particularly at a fixed impingement angle of 30°, which affects the mass flow rates and densities of the reactants and the area of the injector passages, leading to suboptimal synthesis gas production.
Innovation Solution
The injector mixer design allows for a variable impingement angle θ, satisfying the mixing efficiency Equation (I): 2≤2sinθ(m.stoxm.fuel)2(ρfuelρstox)(AfuelAstox)3.1≤7, enabling targeted mixing efficiency between 2 and 7, and allowing for adjustments in the area ratio Afuel/Astox and angle θ to achieve high mixing efficiency above 90%, thereby optimizing reactant mixing in gasification reactors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed impingement angle of 30° is used in conventional injectors, then the injector structure is simple, but the mixing efficiency of reactants is suboptimal
Solution Approach 1:
The patent applies the dynamics principle by making the impingement angle variable rather than fixed. The injector is designed with adjustable geometry that allows the impingement angle to be optimized for different operating conditions, transforming a static structure into a dynamic, adaptable system that can achieve optimal mixing efficiency across varying mass flow rates and densities of reactants
Solution Approach 2:
The patent implements parameter changes by allowing the impingement angle θ to vary within a range rather than being fixed at 30°. This enables the system to adjust the geometric parameter to satisfy the mixing efficiency equation under different operating conditions, optimizing the interaction between fuel and oxidant streams
2Ease of manufacture
If the area ratio Afuel/Astox is fixed in conventional injectors, then the manufacturing is easier, but the ability to achieve targeted mixing efficiency is limited
Solution Approach 1:
The patent applies dynamics by making the area ratio Afuel/Astox adjustable rather than fixed. The injector geometry allows for variable area ratios that can be optimized for different reactant flow rates and densities, enabling the system to adapt to varying operating conditions while maintaining ease of manufacture through standard fabrication techniques
3Device complexity
If conventional injectors are used with fixed geometry, then the device complexity is low, but the cold gas efficiency and reaction conversion rates are suboptimal
Solution Approach 1:
The patent implements parameter changes by allowing the impingement angle and area ratio to vary within optimized ranges. This enables the injector to adapt to different operating conditions, maximizing cold gas efficiency and reaction conversion rates while maintaining relatively simple device complexity through straightforward geometric adjustments
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 achieves high mixing efficiency, reduces heat flux, facilitates compact reactor vessel design, and increases cold gas efficiency, leading to cost savings and improved synthesis gas production, with the ability to retrofit existing systems and maintain high reaction conversion rates.
Implementation Method 1
the oxidant is fed through four impinging passages such that the oxidant impinges upon the fuel stream on the reaction side of the injector
Implementation Method 2
the mixing efficiency of the reactants depends on the mass flow rate and densities of the reactants and the area of the passages of the injector, according to the Rupe Efficiency Elverum-Morey (EM) number where the impingement angle is 30°
Data Source
AI summary
An injector mixer for a gasification reactor system that utilizes reactants includes an injector body that extends between a first face and a second face. The injector body includes a first passage that extends between the first face and the second face and has a first central axis. At least one second, impinging passage extends between the first face and second face and has an associated second central axis that has an angle with the first axis. The angle satisfies mixing efficiency Equation (I) disclosed herein.