Burner Design for Stable Flame at High Discharge Speed
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Solution Overview
Problem
Conventional burners cannot maintain a high discharge speed without causing flame instability and blowoff, limiting their heating efficiency.
Innovation Solution
A burner design featuring a main burner part and a sub burner part positioned in a specific relationship, where the sub burner part is disposed further outward than the main burner part, prevents flow turbulence and maintains high flow speed, allowing stable flame holding at high discharge speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the flow speed of fuel gas and air is increased to increase the discharge speed, then the heating efficiency is improved, but the flame becomes unstable and is blown away to the downstream causing flame off
Solution Approach 1:
The burner is divided into a main burner part and a sub burner part. The main burner part discharges fuel gas and air at high speed for efficient heating, while the sub burner part discharged at a lower speed provides a pilot flame to stabilize the combustion and prevent flame off, thus resolving the contradiction between high discharge speed and flame stability
Solution Approach 2:
The sub burner part acts as an intermediary element that provides a stable pilot flame to ignite and stabilize the high-speed discharge from the main burner part. This intermediary flame bridge ensures that even at high discharge speeds, the flame remains stable and does not blow off
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
The design enables stable flame maintenance at high discharge speeds, enhancing heating efficiency and allowing for more flexible burner placement, such as in steelmaking processes, by increasing the heat transfer coefficient and reducing fuel gas consumption.
Implementation Method 1
Fuel gas and air which are discharged from the main burner part are combusted with each other to thereby form flame for heating an object to be heated
Implementation Method 2
The sub burner part has a function of igniting the fuel gas discharged from the main burner part
Implementation Method 3
the amount of heat transfer Q from the flame to a surface of an object to be heated is proportional to the heat transfer coefficient α
Implementation Method 4
direct heating using such flame formed by a burner
Data Source
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AI summary
Provided is a heating device which can stably hold flame without flame off even when a discharge speed is high, and thus can perform heating with extremely high efficiency. The heating device comprises a burner, wherein the burner comprises: a main burner part having a fuel gas nozzle configured to discharge fuel gas and an air nozzle configured to discharge air for combustion; and a sub burner part positioned further outward than the main burner part and configured to combust the fuel gas discharged from the main burner part.