Flue Gas Mixing Apparatus With Segmented Partition Plate
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Solution Overview
Problem
Existing flue gas mixing apparatuses face challenges in uniformly dispersing a small amount of reducing agent in a large volume of combustion flue gas while maintaining low pressure loss, especially as power generation load changes, leading to fluctuations in NOx concentration and gas flow rate, which complicates the regulation of ammonia injection amounts and increases fan power consumption.
Innovation Solution
A flue gas mixing apparatus with a cuboid gas flow channel segmented into regions on both the gas flow-in and flow-out faces, utilizing a partition plate that introduces combustion flue gas into shifted regions, creating a rotational flow that promotes uniform mixing of the reducing agent and reduces pressure loss by limiting the rotation angle to 90°, allowing for efficient dispersion over a short distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional gas mixer is used to mix flue gas and reducing agent, then mixing effectiveness is improved, but pressure loss increases and fan power consumption increases
Solution Approach 1:
The gas flow channel cross-section is divided into multiple regions (first region, second region, third region, fourth region) with different gas flow rates. This segmentation allows each region to be optimized independently, achieving uniform mixing without requiring excessive pressure loss that would occur in conventional uniform mixers.
Solution Approach 2:
Different regions of the gas flow channel are assigned different local characteristics - specifically, different gas flow rates are maintained in different regions. The first and third regions have higher gas flow rates while the second and fourth regions have lower gas flow rates, creating local quality variations that promote uniform mixing while minimizing overall pressure loss.
2Measurement precision
If the number of ammonia nozzles is increased to regulate ammonia injection amounts, then ammonia distribution control is improved, but device complexity increases and regulation difficulty increases
Solution Approach 1:
Instead of increasing the number of nozzles, the invention changes the parameter of gas flow rate distribution across different regions. By controlling the gas flow rate in each region differently, the system achieves precise ammonia concentration control with fewer nozzles, reducing device complexity while maintaining measurement precision.
3Manufacturing precision
If a large duct length is used to achieve uniform mixing, then mixing uniformity is improved, but device length increases and compactness decreases
Solution Approach 1:
The invention introduces dynamic gas flow rate distribution across different regions rather than using a static, uniform flow channel. By dynamically controlling the gas flow rate in each region, uniform mixing is achieved in a compact space without requiring a long duct length, thus maintaining mixing uniformity while reducing overall device length.
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 apparatus achieves a low pressure loss and effective mixing of flue gas and reducing agent, ensuring a uniform molar ratio of NH3/NOx and reducing fan power consumption, while being compact enough to fit in narrow spaces within the flue gas duct.
Implementation Method 1
creating a rotational flow that promotes uniform mixing of the reducing agent
Implementation Method 2
reduces pressure loss by limiting the rotation angle to 90°
Data Source
AI summary
A flue gas mixing apparatus includes gas mixers, wherein the gas mixers have a gas flow channel, one of parallel two faces of a cuboid space being set as a gas flow-in face, the other thereof being set as a gas flow-out face, and in the gas flow channel, each of the gas flow-in face and the gas flow-out face is segmented into at least four regions which have same symmetric areas by straight lines passing through a center of each face, and a gas flow channel partition plate which introduces the combustion flue gas caused to flow in each of the regions of the gas flow-in face into each of the regions of the gas flow-out face at positions at which the regions are shifted one-by-one around a line segment connecting the centers of the gas flow-in face and the gas flow-out face is included.