Sintering Apparatus Gas Circulation for Temperature Uniformity
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Solution Overview
Problem
The sintering process in existing sintering apparatuses results in inadequate quality and productivity due to temperature disparities within the sintering trailer, leading to insufficient sintering of the upper material layer and environmental pollution from discharged exhaust gases rich in heat energy and contaminants.
Innovation Solution
A sintering apparatus with circulating gas systems that include a first and second circulation part to reuse cooling gases and suctioned air, supplying them back to the sintering trailer to enhance combustion efficiency and maintain consistent temperatures, along with a gas fuel supply to extend combustion time and improve sintering quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air is suctioned downward from the ignited surface of the mixed raw material by the negative pressure of the wind box, then the sintering process can be performed, but the upper layer of the mixed material has a temperature higher than that of the lower layer, resulting in insufficient sintering reaction in the upper layer
Solution Approach 1:
The patent introduces a gas supply device that supplies gas (such as oxygen or air) to the upper layer of the mixed material, reversing the conventional approach where gas is only supplied from below. This inversion of gas flow direction ensures that the upper layer receives sufficient oxygen for complete combustion and sintering reaction, resolving the temperature and reaction completeness issue.
Solution Approach 2:
The patent applies different gas supply conditions to different regions of the sintering system. Specifically, gas is supplied to the upper layer through nozzles positioned above the material, while the lower layer continues to receive air through the wind box. This localized quality adjustment ensures optimal sintering conditions in each region, particularly addressing the oxygen deficiency in the upper layer.
2Productivity
If the sintering exhaust gas or cooling gas is discharged to the outside as it is, then the sintering process can be completed, but environmental pollution occurs and a lot of heat energy is lost
Solution Approach 1:
The patent recovers the heat energy and useful components from the sintering exhaust gas and cooling gas by introducing them back into the sintering system. The exhaust gas, which contains hot air and combustion products, is redirected through circulation paths to provide additional heating and oxygen supply to the mixed material, thereby recovering energy that would otherwise be wasted and reducing environmental pollution.
Solution Approach 2:
The patent creates a continuous circulation system where exhaust gas and cooling gas are continuously redirected back to the sintering zone. This continuous reuse of thermal energy and gas components maintains sustained high temperatures and oxygen supply throughout the sintering process, improving energy efficiency and eliminating the need to discharge potentially polluting gases.
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 improves the quality and productivity of sintered ore by ensuring consistent high-temperature combustion, reducing environmental pollution, and optimizing energy use by recycling thermal energy within the sintering process.
Implementation Method 1
a surface of the mixed raw material ignites by using an ignition furnace
Implementation Method 2
a wind box provided in plurality under the sintering trailers along the moving path to suction air downward from the sintering trailers to sinter the raw material
Implementation Method 3
a cooler disposed on one side of the moving path to supply a cooling gas to a sintered ore discharged from each of the sintering trailers
Implementation Method 4
a first circulation part connected to the cooler to supply at least one portion of the cooling gas supplied to the raw material to an upper portion of the sintering trailer
Data Source
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AI summary
Provided is a sintering apparatus. The sintering apparatus includes a plurality of sintering trailers movably disposed along a moving path and in which a raw material is inserted therein, an ignition furnace disposed above the sintering trailers to spray flames to a top surface of the raw material, a wind box provided in plurality under the sintering trailers along the moving path to suction air downward from the sintering trailers to sinter the raw material, a cooler disposed on one side of the moving path to supply a cooling gas to a sintered ore discharged from each of the sintering trailers, and a first circulation part connected to the cooler to supply at least one portion of the cooling gas supplied to the raw material to an upper portion of the sintering trailer to control a combustion process of the raw material or improve combustion efficiency, thereby improving quality and productivity of the raw material.