Pulverized Coal Injecting Burner for Melting Furnace
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Solution Overview
Problem
The existing dust burner systems in melting furnaces face inefficiencies when the dust reinjection rate is low, leading to excessive oxygen injection, increased carbon dioxide production, and reduced ore reduction rates, along with risks of flame contact and inefficient temperature distribution, which affects the operating efficiency and quality of molten iron production.
Innovation Solution
A pulverized coal injecting apparatus is installed between the dust burner and the bed of the melting furnace, which includes a pulverized coal injecting burner and a control unit to selectively inject pulverized coal and oxygen, optimizing the gas oxidation degree and calorie distribution to enhance ore reduction rates and stabilize molten iron production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the dust burner is located close to the bed to improve heat transfer efficiency, then the calorie supply to the bed is improved, but the flame contacts the bed surface causing excessive dust generation and dust burner damage
Solution Approach 1:
The patent introduces a pulverized coal injecting burner as an intermediary device positioned between the dust burner and the bed surface. This intermediate burner combusts pulverized coal to create a protective flame zone that prevents direct contact between the dust burner flame and the bed surface, thereby protecting the dust burner while maintaining effective heat transfer to the bed.
2Reliability
If the dust burner is located far away from the bed to avoid flame contact, then the dust burner safety is improved, but most calorie is used to raise dome temperature reducing operating efficiency
Solution Approach 1:
The pulverized coal injecting burner serves as a mediator that enables the dust burner to be positioned at an optimal distance from the bed. It transmits thermal energy through its combustion process, ensuring that sufficient calorie reaches the bed while the dust burner remains at a safe distance, thus maintaining both safety and operating efficiency.
Solution Approach 2:
The patent changes the combustion parameters by introducing pulverized coal combustion as an intermediate step. This creates a controlled thermal field that modifies the temperature distribution between the dust burner and the bed, allowing efficient heat transfer without direct flame contact.
3Quantity of substance
If excessive oxygen is injected to combust carbon in dust when dust reinjection amount is reduced, then the carbon combustion is improved, but carbon monoxide is combusted increasing carbon dioxide content and lowering ore reduction rate
Solution Approach 1:
The patent changes the combustion parameters by introducing pulverized coal as a additional carbon source. This modifies the oxygen consumption pattern, allowing controlled combustion that maintains carbon monoxide levels necessary for the reduction process while still achieving complete combustion of injected carbon.
Solution Approach 2:
The pulverized coal injection creates a distributed combustion zone with controlled oxygen access. The fine particulate nature of pulverized coal allows for controlled combustion reactions that regulate oxygen consumption, preventing excessive oxidation of carbon monoxide while maintaining efficient carbon utilization.
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 allows for controlled ore reduction rates, reduced carbon dioxide production, and improved operating efficiency by ensuring sufficient calorie supply to the bed without direct flame contact, thereby stabilizing molten iron quality and reducing production costs.
Implementation Method 1
a pulverized coal injecting burner which combusts the pulverized coal
Implementation Method 2
a dust burner which decomposes and combusts dust and dry distillation gas generated in the melting furnace
Implementation Method 3
separated by a principle of the cyclone
Data Source
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AI summary
To inject pulverized coal into an upper portion of a bed of a melting furnace to enhance an oxidation degree of reduced gas generated in the melting furnace and improve an ore reduction rate, thereby lowering a portion of carbon dioxide and increasing a portion of carbon dioxide in the melting furnace, provided are a pulverized coal injecting apparatus of a melting furnace including at least one pulverized coal injecting burner which is installed at an upper portion of a bed of a melting furnace; and a control unit which controls an injecting amount of pulverized coal supplied to the pulverized coal injecting burner and a pulverized coal injecting method including: injecting pulverized coal using a pulverized coal injecting burner installed in the melting furnace; and controlling an environment of injecting the pulverized coal into the melting furnace.