Drying System Dew Point Control via Merged Airflow
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Solution Overview
Problem
Existing methods for controlling dew points in multiple connected drying furnaces require extensive facility expansion and struggle to maintain appropriate dew point control, leading to condensation issues that affect the quality of the dried product.
Innovation Solution
A drying system with an air supply and exhaust system alternately connected between furnaces, featuring flow rate regulation valves and a controller to manage dew points by adjusting air flow rates, ensuring the water content remains below saturation levels and preventing condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fans are installed to each drying furnace to control dew point individually, then dew point control precision is improved, but facility complexity and cost increase
Solution Approach 1:
The patent merges the air supply and exhaust systems of multiple drying furnaces into a single integrated system. One air supply fan serves multiple furnaces through common air supply ducts, and one air exhaust fan handles exhaust from multiple furnaces through common exhaust ducts. This consolidation maintains dew point control capability while reducing the number of fans and simplifying facility structure.
Solution Approach 2:
The patent makes the air supply and exhaust systems universal by designing them to serve multiple drying furnaces simultaneously. The air supply system distributes conditioned air to multiple furnaces, and the air exhaust system collects and exhausts moisture from multiple furnaces, allowing a single fan system to perform the dew point control function for the entire drying line.
2Reliability
If multiple fans are installed for each drying furnace, then dew point control capability is improved, but system cost and maintenance requirements increase
Solution Approach 1:
The patent combines multiple fan systems into a unified air supply and exhaust system. Instead of installing separate fans in each drying furnace, the system uses shared air supply ducts and exhaust ducts with centralized fan units, reducing the total number of fans required and lowering both initial investment and ongoing maintenance costs.
Solution Approach 2:
The integrated air supply and exhaust system automatically manages dew point control across all drying furnaces through centralized control. The system self-regulates air distribution and exhaust collection, maintaining reliable dew point control without requiring individual fan systems in each furnace.
3Device complexity
If a single air supply and exhaust system is used for multiple drying furnaces, then facility complexity is reduced, but dew point control performance deteriorates
Solution Approach 1:
The patent implements local quality by providing dedicated air supply and exhaust ducts that connect each drying furnace to the centralized fan systems. Each furnace has its own connection points and ductwork, allowing localized air flow control and dew point management while still benefiting from the simplified centralized fan configuration.
Solution Approach 2:
The patent uses air supply ducts and exhaust ducts as intermediaries to connect individual drying furnaces to the centralized fan systems. These ducts act as mediators that distribute conditioned air to each furnace and collect exhaust air from each furnace, enabling precise local dew point control through a simplified centralized fan architecture.
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 solution effectively controls dew points across multiple furnaces without facility expansion, reducing condensation and ensuring high-quality coated metal plate production.
Implementation Method 1
When a metal plate to which a coating material containing a solvent such as water is applied, is dried in a drying furnace, control of the dew point in the drying furnace is necessary because water evaporates in the furnace.
Implementation Method 2
The dew point is increased with water staying in the furnace, as a result of inappropriate management of the amount of air supplied and exhausted from the drying furnace. An increase in the dew point causes condensation in the furnace
Implementation Method 3
In this method, however, condensation easily occurs, and control of the dew point is therefore more important. The dew point is increased with water staying in the furnace, as a result of inappropriate management of the amount of air supplied and exhausted from the drying furnace.
Data Source
AI summary
A drying system includes: drying furnaces connected in series; an air supply system including an air supply pipe, the air supply system being configured to supply dry air into the furnaces, and an air exhaust system including an air exhaust pipe, the air exhaust system being configured to exhaust wet air in the furnaces, wherein the air supply system and the air exhaust system are being alternately connected between the drying furnaces; a first flow rate regulation valve provided to the air supply system; and a second flow rate regulation valve provided to the air exhaust system.