Stepwise Flue Gas Distribution With Graded Oxygen Supplementation
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Solution Overview
Problem
Existing sintering flue gas circulation technologies face challenges in achieving uniform distribution of high-volume flue gas and maintaining adequate oxygen levels, leading to safety hazards and production limitations when circulation rates exceed 30%.
Innovation Solution
A stepwise gas distribution and graded oxygen supplementation device with a variable-diameter circulating flue gas distribution main pipe and branch pipes, combined with oxygen supplementing devices, to achieve uniform gas distribution and targeted oxygen supply based on demand across different sintering stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the flue gas circulation rate is increased to more than 30%, then the emission of sintering flue gas is significantly reduced and high-temperature decomposition of carbon monoxide and dioxins is strengthened, but the oxygen content in the sintering process is reduced
Solution Approach 1:
The distribution main pipe is divided into multiple stepped sections with different diameters, and oxygen supplementing devices are selectively installed in specific branch pipes corresponding to different sintering zones. This segmentation allows different zones to receive different amounts of circulating flue gas and oxygen supplementation, resolving the contradiction between high circulation rate and adequate oxygen content.
Solution Approach 2:
Different sections of the distribution system are designed with different characteristics: the main pipe has stepped diameter reductions to control gas volume distribution, while oxygen supplementing devices are strategically placed in branch pipes for zones requiring higher oxygen. This local differentiation ensures each zone receives appropriate gas composition according to its specific sintering needs.
2Object-generated harmful factors
If the flue gas circulation rate is increased to more than 30%, then the catalytic reduction of nitrogen oxides is promoted, but flue gas overflow and safety hazards occur due to uneven distribution of large gas volume
Solution Approach 1:
The distribution system is segmented into multiple stepped sections with progressively reducing diameters, each connected to specific sintering zones. This segmentation enables precise control of gas volume distribution to different areas, preventing overflow and ensuring safe operation at high circulation rates.
Solution Approach 2:
The stepped pipe structure creates dynamic pressure gradients along the gas flow path, with smaller diameter sections creating higher resistance to naturally limit gas flow to appropriate levels for each zone. This dynamic control mechanism prevents over-pressurization and overflow hazards.
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 device enables flue gas circulation ratios above 35% while ensuring uniform gas distribution and oxygen supplementation, preventing overflow and maintaining stable sintering production without safety hazards.
Implementation Method 1
middle parts inner sides of the circulating flue gas distribution branch pipes are provided with conical flow guide devices, tips of the conical flow guide devices are arranged towards the flue gas sealing cover
Implementation Method 2
oxygen supplementing devices arranged in the circulating flue gas distribution branch pipes needing to increase oxygen content
Implementation Method 3
gas outlet ends of the oxygen supplementing gas branch pipes are arranged close to the flue gas sealing cover, gas inlet ends of the oxygen supplementing gas branch pipes are arranged close to the circulating flue gas distribution main pipe
Data Source
AI summary
A stepwise gas distribution and graded oxygen supplementation device for distribution of high-ratio circulating flue gas is provided. The circulating flue gas distribution main pipe includes stepped sections communicated with each other in sequence, and pipe diameters of the stepped sections are reduced in sequence along a flue gas moving direction. The circulating flue gas distribution branch pipes are each in communication with and arranged at one side of the corresponding stepped section. The flue gas sealing cover is in communication with gas outlet ends of the circulating flue gas distribution branch pipes. The oxygen supplementing devices are arranged in the circulating flue gas distribution branch pipes needing to increase oxygen content. The oxygen supply device is in communication with gas inlet ends of the oxygen supplementing devices.