Flue Gas Powder Injection With Coaxial Jets and Low Peripheral Flow
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Solution Overview
Problem
Current methods for treating combustion fumes in furnace ducts face challenges such as poor dispersion and agglomeration of powdery compounds, high maintenance costs due to invasive devices like penetrating lances, and suboptimal temperature conditions for pollutant reduction, which disrupt the operation of flue gas treatment installations.
Innovation Solution
A device and method utilizing a chamber and peripheral pipe system to create coaxial gas jets, allowing for the efficient injection of a powdery compound into the furnace pipe without invasive devices, optimizing dispersion and maintaining optimal temperature conditions for pollutant reduction by minimizing peripheral gas flow and using calcium-magnesium compounds effective at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If penetrating lances are used to inject powder into the furnace pipe, then powder dispersion is improved, but device reliability deteriorates due to temperature and acidity damage
Solution Approach 1:
The invention extracts the powder injection function from the invasive penetrating lance and relocates it to the outer periphery of the furnace pipe. The injection device is positioned outside the high-temperature and high-acidity zone, with powder delivered through a tangential injection mechanism that avoids direct exposure to corrosive flue gas conditions, thereby improving device reliability while maintaining dispersion effectiveness.
Solution Approach 2:
The invention introduces an intermediary injection mechanism where powder is delivered through a tangential injection port rather than directly through a penetrating lance. This intermediary approach allows powder to be injected into the flue gas flow without the injection device itself being exposed to the harshest conditions, extending device life while achieving good dispersion.
2Productivity
If high transport speed is used for powder delivery, then injection rate is improved, but powder loss increases due to friction and attrition
Solution Approach 1:
The invention employs pneumatic transport to deliver powder to the injection point. Gas flow is used to convey the powder through the transport system, reducing mechanical friction and attrition compared to purely mechanical conveyance methods. This allows for efficient powder delivery while minimizing material loss and degradation.
3Ease of operation
If high peripheral gas flow is used for powder injection, then powder dispersion is improved, but energy efficiency deteriorates
Solution Approach 1:
The invention applies local quality by directing gas flow specifically at the injection point rather than using high peripheral gas flow throughout the entire furnace pipe. The tangential injection mechanism creates localized turbulence and mixing only where needed for powder dispersion, minimizing unnecessary energy consumption while achieving effective powder distribution.
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 ensures high-efficiency pollutant abatement with reduced maintenance needs, maintaining optimal temperature conditions and energy efficiency by avoiding the use of invasive devices and minimizing peripheral gas flow, thus achieving effective reduction of pollutants like SO2 at high temperatures.
Implementation Method 1
A device and method utilizing a chamber and peripheral pipe system to create coaxial gas jets, allowing for the efficient injection of a powdery compound into the furnace pipe
Implementation Method 2
a powder compound for reducing flue gas pollutants... efficient injection of a powdery compound into the furnace pipe... achieving effective reduction of pollutants like SO2 at high temperatures
Implementation Method 3
calcium-magnesium compounds effective at high temperatures... effective reduction of pollutants like SO2
Data Source
Figure 1
Figure 1A
Figure 2
AI summary
Device (10) for injecting powders into a furnace pipe (500), comprising a chamber (230) connected to a peripheral pipe (220) and, on the other hand, to the said furnace pipe via the said peripheral pipe (220), which comprises a first part (221) of diameter DP1, and a second part (222) of diameter DP2, having a downstream end (222a) and intended to be in communication with the furnace pipe, and a powder conveying pipe (120) which has a diameter DT and a downstream end (121), characterized in that the second part of the peripheral pipe has a length L ≥ the diameter (DP2) of the second part of the peripheral pipe, and in that the diameter (DT) and the diameter (DP2) are connected by the relationship 0 < DP2 ‑ DT < 1/2 DT.