Ammonia Injection Device with Diffuser Panels for Compact Denitration
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Solution Overview
Problem
Conventional ammonia injection devices face challenges in achieving uniform mixing of ammonia with exhaust gas at shorter distances, which is necessary for compact exhaust gas denitration systems, leading to insufficient denitration function.
Innovation Solution
The ammonia injection device incorporates a plurality of ammonia injection pipes with nozzle pipes and diffuser panels that generate a Karman vortex, allowing for effective mixing of ammonia with exhaust gas at a short distance by extending diffuser panels downstream and fixing them to nozzle pipes, enhancing mixing efficiency and reducing manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance from the ammonia injection device to the denitration catalyst is reduced to achieve a compact exhaust gas denitration system, then the system compactness is improved, but the mixing of ammonia with exhaust gas becomes insufficient
Solution Approach 1:
The invention divides the ammonia injection function into multiple nozzle pipes arranged in the longitudinal direction of the ammonia injection pipe. Each nozzle pipe is equipped with diffuser panels, creating multiple localized injection points that enhance mixing efficiency over shorter distances, thus resolving the contradiction between system compactness and mixing uniformity.
Solution Approach 2:
The invention introduces diffuser panels extending in the longitudinal direction of the ammonia injection pipe, adding a spatial dimension to the injection structure. This dimensional extension creates a more distributed injection pattern that improves mixing performance within a compact distance to the denitration catalyst.
2Manufacturing precision
If multiple nozzle pipes with diffuser panels are installed to improve mixing performance at short distance, then the mixing efficiency is improved, but the device complexity increases
Solution Approach 1:
The invention combines the nozzle pipe and diffuser panel into an integrated assembly where the diffuser panel is fixed to the nozzle pipe. This merging of components simplifies the overall structure and reduces the number of separate parts while maintaining the enhanced mixing function, thus resolving the contradiction between mixing efficiency and device complexity.
Solution Approach 2:
The diffuser panel serves multiple functions: it diffuses the ammonia jet, creates a vortex flow pattern, and mixes ammonia with exhaust gas. This multi-functionality reduces the need for additional separate components, simplifying the device structure while achieving effective mixing at short distances.
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 configuration enables uniform mixing of ammonia with exhaust gas over a shorter distance, contributing to a compact exhaust gas denitration system with superior mixing performance and reduced labor costs in device manufacturing.
Implementation Method 1
a vortex is generated at a downstream side of the ammonia injection pipe by the first radial flat plate blades and the second radial flat plate blades installed by a number of pairs
Implementation Method 2
uniform injection of the ammonia into the exhaust gas is attempted by increasing a distance from the ammonia injection device to the denitration catalyst to secure a residence time for sufficiently diffusing the ammonia in the exhaust gas
Data Source
AI summary
Provided is an ammonia injection device (10) installed at an exhaust gas duct through which an exhaust gas generated in a gas turbine flows, and configured to inject ammonia into the exhaust gas at an upstream side of a denitration catalyst configured to perform denitration processing in a flowing direction of the exhaust gas, the device including a plurality of ammonia injection pipes (11) disposed in parallel each other in a surface which traverses the exhaust gas duct. A plurality of nozzle pipes (12) configured to eject the ammonia from the ammonia injection pipes in an arrangement direction of the plurality of ammonia injection pipes are installed at the ammonia injection pipe in a longitudinal direction of the ammonia injection pipes. Diffuser panels (13) extending toward a downstream side in a flowing direction of the exhaust gas at both sides in a longitudinal direction of the ammonia injection pipes with respect to the nozzle pipes are formed at the nozzle pipes. The ammonia injection device can contribute to a compact exhaust gas denitration system.