Combustion Reactor Nozzle Design for Uniform Nanopowder Synthesis
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Solution Overview
Problem
Existing combustion reactors for nanopowder synthesis face challenges in achieving uniform reactions and preventing oxide deposition on nozzle surfaces, leading to inconsistent flame stability and temperature control.
Innovation Solution
A combustion reactor design with an oxidized gas inlet opening adjacent to the flame jet orifice, angled between 30 to 60 degrees, and a synthesis apparatus with controllers for gas flow rates, allowing for precise control of flame temperature and uniformity, and minimizing oxide deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a diffusion type combustion reactor with three cylindrical nozzles is used, then the structure is simple, but uniform reaction is difficult to induce because reaction occurs only on the contact surface of each gas
Solution Approach 1:
The combustion reactor is divided into multiple nozzle units (first, second, third nozzles) arranged in specific patterns, with each nozzle having separate gas supply channels. This segmentation allows different gases to be supplied through distinct paths while maintaining overall structural simplicity, resolving the contradiction between simple structure and uniform reaction.
Solution Approach 2:
The nozzle structure employs nested channels where gas supply channels are positioned concentrically or adjacently within each nozzle body. The first, second, and third nozzles are arranged to create nested flow patterns that promote uniform mixing and reaction, achieving reaction uniformity without significantly increasing structural complexity.
2Manufacturing precision
If a pre-mix type combustion reactor is used, then uniform reaction is achieved, but precursor gas and fuel gas are easily oxidized or combusted during the mixing process
Solution Approach 1:
The reactor design performs preliminary gas separation by providing distinct supply channels for precursor gas, fuel gas, and oxidizing gas up to the reaction zone. Gases are introduced separately and only mix at the controlled reaction point, preventing premature oxidation or combustion that would occur in pre-mixing chambers, while still achieving uniform reaction through the structured nozzle arrangement.
3Productivity
If oxide deposition occurs on nozzle surfaces in the combustion reactor, then continuous and uniform reaction cannot be sustained
Solution Approach 1:
The design extracts and separates the oxidizing gas supply into distinct channels (first, second, third nozzles) that are positioned to control oxidation timing and location. By separating the oxidizing function from the fuel and precursor gas supplies, the system minimizes unnecessary oxide formation on nozzle surfaces while maintaining continuous operation capability.
4Manufacturing precision
If the combustion chamber reaction region is not precisely controlled, then nanopowder form cannot be precisely controlled
Solution Approach 1:
Each nozzle (first, second, third nozzles) is designed with specific local functions: one supplies precursor gas, another supplies fuel gas, and the third supplies oxidizing gas. The nozzles are positioned at specific locations and angles to create controlled reaction zones. This local differentiation of nozzle functions and positions enables precise control of nanopowder form without requiring complex overall system modifications.
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
Enables continuous and uniform nanopowder synthesis with stable flame temperature distribution, preventing oxide deposition and optimizing reactor structure for efficient nanopowder production.
Implementation Method 1
A nanopowder combustion reaction method is a method of synthesizing nanopowders by using a precursor in a gaseous state, liquid state or solid state
Implementation Method 2
By disposing an oxidized gas inlet opening at a region adjacent to a flame jet orifice, the degree of deposition of oxide on an inner wall of the reaction nozzle is reduced
Data Source
AI summary
The present invention relates to a combustion reactor for nanopowders, a synthesis apparatus for nanopowders using the combustion reactor, and a method of controlling the synthesis apparatus. The combustion reactor for nanopowders comprises an oxidized gas supply nozzle connected to an oxidized gas tube; a gas supply unit supplying a fuel gas and a precursor gas; and a reaction nozzle forming concentricity on an inner wall of the oxidized gas supply nozzle to be connected to the gas supply unit and having an inlet opening for supplying an oxidized gas disposed at a region adjacent to a jet orifice for spraying flames. In the present invention, it is possible to precisely control the stability of flames, the uniform temperature distribution of flames and the temperature of flames that affect the properties of nanopowders, and the deposition of oxide in the combustion reactor is prevented to thus enable a continuous and uniform reaction for a long time, thereby enabling an economic and efficient synthesis of nanopowders.