MoSi2 Electric Convective Heaters for High-Temperature Flow Uniformity
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Solution Overview
Problem
Current industrial heating processes face challenges in achieving high temperatures (above 900°C) with low-pressure drop requirements, efficiency losses due to Reynolds number inversion, and heating element burnout, limiting the effectiveness of electric convective heaters.
Innovation Solution
Implementing high-temperature MoSi2 heating elements and strategically placing flow modifiers within the heated fluid flow to counteract Reynolds number inversion, ensuring uniform temperature distribution and preventing element burnout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electric convective heaters operate at high temperatures above 900°C, then productivity and energy efficiency improve, but heating elements burn out and system reliability deteriorates
Solution Approach 1:
The patent changes the material parameter of the heating element from conventional materials to MoSi2 (molybdenum disilicide), which has a melting point above 2000°C. This material parameter change enables the heating element to withstand temperatures above 900°C without burnout, resolving the contradiction between high-temperature operation and heating element lifespan.
2Use of energy by moving object
If flow velocity is increased to maintain convective heat transfer at high temperatures, then heat transfer efficiency improves, but pressure drop increases excessively
Solution Approach 1:
The patent changes the physical state parameter of the fluid from cold air to superheated steam. Superheated steam has different thermodynamic properties including lower density and higher specific heat capacity, which improve convective heat transfer efficiency while reducing the pressure drop required to maintain flow, thus resolving the contradiction between heat transfer efficiency and pressure drop.
3Stability of the object's composition
If Reynolds number inversion occurs in the heated fluid flow, then temperature distribution becomes non-uniform, but flow modification complexity increases
Solution Approach 1:
The patent changes the fluid property parameter by using superheated steam instead of cold air. This parameter change shifts the Reynolds number characteristics of the flow, preventing the inversion phenomenon that causes temperature non-uniformity. The simpler approach of changing fluid properties rather than adding complex flow modifiers resolves the contradiction between temperature uniformity and device 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
Enables efficient operation at temperatures up to 1200°C with reduced pressure drop and extended heating element lifespan, enhancing energy efficiency and productivity.
Implementation Method 1
Implementing high-temperature MoSi2 heating elements
Implementation Method 2
efficient electrical convective heating
Data Source
AI summary
Presented are methods and apparatus for the increase of heating efficiency by the control of Reynolds number inversion in high temperature heating devices through the inclusions of flow modification devices precisely positioned in the hot fluid flow of the high temperature fluid heating device. Such flow modifiers allow for the internal temperature of the heated fluid to more closely reflect the fluid output temperature.