Residual Protective Gas Heating in Industrial Furnaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Industrial furnaces face inefficiencies in using residual protective gases as heating gases, leading to wasted energy, as existing methods require burning off escaping flue gases without effectively reusing their energy content.
Innovation Solution
Implementing a system where a first burner is used to combust protective gas with a lower calorific value, assisted by a pilot burner and a blower-controlled gas supply, prioritizing the use of protective gas for heating, and engaging a second burner only when necessary to maintain setpoint temperatures, with automatic monitoring and control of pressure and gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If residual protective gas is burned off without reuse, then emission control is simplified, but energy efficiency deteriorates
Solution Approach 1:
The patent converts the harmful residual protective gas that needs to be burned off into a useful heating resource. By routing the residual protective gas from the high-temperature furnace to the preheating furnace burners, the system transforms waste gas into a fuel source that provides heat for preheating materials, thereby improving energy efficiency while maintaining emission control
Solution Approach 2:
The residual protective gas serves dual functions: first as a protective atmosphere in the high-temperature furnace, then as a heating fuel in the preheating furnace. This multi-functionality allows the same gas to fulfill different roles in the process, eliminating waste and improving overall system efficiency
2Loss of energy
If protective gas is used as heating gas, then energy efficiency improves, but system complexity increases
Solution Approach 1:
The patent merges the protective gas supply system with the heating system by routing the same gas flow to serve both purposes. The residual protective gas from the high-temperature furnace is directly utilized in the preheating furnace burners, combining what would otherwise be separate systems into an integrated energy recovery system
Solution Approach 2:
The system uses its own residual protective gas to provide heating, making the system self-sufficient. The preheating furnace heats itself using the protective gas that would otherwise be wasted, reducing the need for external fuel sources and simplifying the overall energy input requirements
3Loss of energy
If residual protective gas is reused as heating gas, then energy waste is reduced, but operational reliability may deteriorate
Solution Approach 1:
The system implements feedback control by continuously monitoring the temperature in the preheating furnace and adjusting the amount of residual protective gas supplied to the burners. This ensures that the heating process remains stable and reliable while maximizing energy utilization from the residual gas
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 approach enhances energy efficiency by utilizing residual protective gases as a heating source, reducing energy waste and pollutant emissions, while ensuring reliable furnace operation through adaptive control of gas flow and burner engagement.
Implementation Method 1
the protective gas is combusted together with a heating gas that has a lower calorific value, such as natural gas
Implementation Method 2
a blower that draws the protective gas for example out of an inlet lock of the furnace system
Implementation Method 3
the gas is cooled in a gas chiller to protect it from overheating
Implementation Method 4
the speed of the blower is increased via a frequency transducer
Data Source
AI summary
In order to increase energy efficiency in an industrial furnace (1) operated by heating gas and protective gas for thermally treating materials, a first burner (3.1) is actuated for heating with priority over a second burner (3.2), the second burner (3.2) is engaged additionally and operated when the output from the first burner (3.1) falls below the level necessary to heat the industrial furnace (1) up to a temperature setpoint, and the second burner (3.2) is switched off when the temperature setpoint has been reached.