Electric Furnace Heating Tube Layout for Uniform Radiant Heating
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Solution Overview
Problem
Existing furnaces with gas-fired burners provide non-uniform heating of materials due to unequal heat input, leading to inefficiencies and potential overheating or underheating of tubes, and require excessive space and insulation, with high carbon dioxide emissions.
Innovation Solution
Electrically powered furnaces with heating elements arranged in a repeating pattern to ensure each heating tube is substantially equidistant from multiple heating elements, providing uniform heat distribution and reducing the need for refractory insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If gas-fired burners are positioned at opposing walls to provide heat input to tubes, then the heating capacity is sufficient for the tubes, but the heating uniformity deteriorates because portions of tubes adjacent the walls receive relatively more heat input than portions not adjacent the walls
Solution Approach 1:
The heating system is segmented into multiple independent heating zones along the tube length. Each heating zone has its own controllable heater, allowing independent temperature control for different sections of the tube, thereby achieving uniform heating along the entire tube length despite the tubes being positioned between opposing walls.
Solution Approach 2:
Different regions of the heating system are assigned different heating characteristics. Heaters positioned near the walls are controlled to provide less heat input, while heaters in intermediate positions provide more heat input, creating a non-uniform heating pattern that compensates for the wall proximity effect and achieves uniform overall heating.
2Productivity
If heat input is provided only at opposing walls, then the furnace structure is simple, but the heating capacity for multiple columns of tubes is insufficient because tubes farther from the walls would not receive the same heat input as tubes adjacent the walls
Solution Approach 1:
The heating system transitions from a two-dimensional wall-mounted heater arrangement to a three-dimensional configuration where heaters are positioned both along the walls and in intermediate positions between the walls. This spatial redistribution allows heat to reach tubes at all positions uniformly, enabling multiple columns of tubes to be heated effectively.
Solution Approach 2:
The heating system is designed to serve multiple functions simultaneously: it can heat multiple columns of tubes uniformly, maintain different temperature profiles for different tube positions, and scale to accommodate varying furnace sizes and tube configurations through the modular heater arrangement.
3Use of energy by moving object
If tubes adjacent the walls are used to maximize heat input utilization, then the heating efficiency for those tubes is high, but the tubes impede or block heat input to tubes farther from the walls, enhancing the disparity in heat input
Solution Approach 1:
The heating system incorporates temperature sensing and control mechanisms that monitor the temperature of tubes at different positions. Based on this feedback, the control system adjusts the power supplied to each heater to compensate for the blocking effect of tubes near the walls, ensuring that tubes farther from the walls receive adequate heat input while maintaining overall energy efficiency.
4Manufacturing precision
If a single column of tubes is heated for each pair of opposing walls, then the heating uniformity is maintained, but the space utilization deteriorates because increasing the heating capacity requires a relatively large amount of space
Solution Approach 1:
Multiple heating zones and multiple columns of tubes are merged into a single integrated furnace system. The modular heater configuration allows multiple tube columns to be heated simultaneously within the same furnace volume, effectively combining what would traditionally require separate heating systems and improving space utilization while maintaining heating uniformity.
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
Achieves more uniform heating of materials, enhances heating efficiency, reduces space requirements, and lowers carbon emissions by using electric heating elements.
Implementation Method 1
electrically powered heating elements extending in the interior volume... each defining an interior passage positioned to receive a feed and heat the feed... The plurality of heating tubes are positioned in the furnace housing to receive heat radiated from the plurality of heating elements
Implementation Method 2
heat the feed as the feed passes through the interior passage... heat is transferred from the tubes to the material
Data Source
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AI summary
An electrically powered furnace may include a furnace housing and heating elements extending in the furnace housing. The furnace also may include heating tubes extending in the interior volume, and each of the heating tubes may define an interior passage positioned to receive and heat the feed as the feed passes through the interior passage. The heating tubes may be positioned in the furnace housing to receive heat radiated from the heating elements, and the heating tubes may be arranged in one or more of at least two rows or at least two columns and such that each of the heating tubes is substantially equidistant from three or more of the heating elements. A method may include supplying a feed to the heating tubes, heating the heating tubes via the heating elements, and heating the feed via as the feed passes through the heating tubes.