Gas phase type heating method and gas phase type heating device
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Solution Overview
Problem
Existing gas phase heating methods using latent heat of condensation of vapor in vapor heating furnaces face challenges such as vapor loss during loading and unloading, non-uniform heating, and energy loss due to vapor cooling, especially when dealing with three-dimensional objects of high heat capacity.
Innovation Solution
A continuous furnace system is introduced, comprising a vapor heating furnace and a heating furnace connected via a loading/unloading portion, a cooler, and a connection portion with a pressure loss design that minimizes vapor loss and ensures uniform pressure, allowing for efficient heat transfer and stable heating of three-dimensional objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a vapor heating furnace uses latent heat of condensation of vapor for heating, then heating efficiency is improved, but vapor loss during loading and unloading occurs
Solution Approach 1:
The furnace is divided into multiple heating zones (first vapor heating furnace, second vapor heating furnace, and heating furnace) with separate loading/unloading portions. This segmentation allows vapor to be contained and utilized in each zone while enabling independent loading and unloading operations without significant vapor loss to the external environment.
Solution Approach 2:
A cooler is introduced as an intermediary component between the vapor heating furnaces and the external environment. The cooler condenses vapor that might escape during loading and unloading operations, converting it back to liquid form and preventing vapor loss, thereby maintaining heating efficiency while allowing material handling.
2Productivity
If hot air collides with the object at high speed to improve heat transfer rate, then heating speed is improved, but components may be peeled off the board
Solution Approach 1:
The system uses vapor phase heating instead of forced hot air circulation. The vapor naturally contacts the object surface through phase change and condensation, providing gentle and uniform heating without the mechanical impact of high-speed air flow, thus preventing component peeling while maintaining effective heating speed through latent heat transfer.
3Temperature
If the object is soaked in vapor by moving it downwards in the vapor heating furnace, then heating performance is improved, but air mixes with vapor and heating performance decreases
Solution Approach 1:
The furnace is segmented into multiple zones with controlled atmospheres. Each vapor heating furnace zone maintains separate vapor and air regions through strategic placement of heating elements and vapor generation points, allowing objects to be heated by vapor condensation without requiring physical movement that would cause vapor-air mixing.
Solution Approach 2:
Instead of moving objects vertically through vapor zones (one-dimensional approach), the system uses multiple horizontal zones with vapor generated at different locations. Objects remain stationary while vapor is delivered to them through controlled release and condensation surfaces, maintaining vapor purity and heating effectiveness without mechanical movement.
4Loss of substance
If a condenser with a long tunnel is provided to condense and collect vapor, then vapor collection is improved, but energy loss occurs due to cooling vapor
Solution Approach 1:
Vapor is condensed locally within each heating zone before it can escape to the external environment. The cooler is positioned to intercept and condense vapor at the point of potential loss, converting it back to liquid form in situ, thereby preventing vapor loss without requiring long-distance vapor transport that would cause energy loss.
Solution Approach 2:
The system uses the condensation process itself to recover vapor rather than requiring separate collection and recovery systems. The cooler enables vapor to self-condense and return to liquid form within the furnace system, maintaining mass balance and reducing energy loss through evaporation and re-condensation cycles.
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 configuration prevents vapor loss during object handling, maintains uniform heating performance across the furnace, and enhances the heating efficiency by reducing pressure differences and energy loss, enabling effective heating of complex-shaped objects with high heat capacity.
Implementation Method 1
cooling the vapor of the heat transfer liquid by a cooler provided above the loading/unloading portion in the vapor heating furnace
Implementation Method 2
a vapor heating furnace that heats the object by using latent heat of condensation of vapor of a heat transfer liquid
Data Source
AI summary
A gas phase type heating method includes loading an object into a vapor heating furnace or a heating furnace via a loading/unloading portion, cooling vapor of a heat transfer liquid by a cooler provided above the loading/unloading portion in the vapor heating furnace, and causing a gas to go in and out, making a pressure in a continuous furnace uniform, and heating the loaded object, by a connection portion that is provided above the cooler and has a pressure loss smaller than a pressure loss of the loading/unloading portion.