Flow Switching Section for Large Particle Ash Collection
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Solution Overview
Problem
Thermal power plants face inefficiencies in collecting large particle ash, which are generated during combustion and contribute to environmental pollution, as existing methods do not effectively capture particles larger than 10 μm, leading to increased inertia and potential duct erosion.
Innovation Solution
An apparatus with a main duct, hopper, and flow switching section is designed to collect large particles by switching the gas flow direction, using a plate-shaped flow switching section and side hopper to increase collection efficiency and prevent particle discharge into the outlet duct, thereby reducing toxic emissions and extending electrostatic precipitator capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large particle ash is collected through hoppers before removal by electrostatic precipitators, then collection efficiency of large particles is improved, but device complexity increases due to additional flow switching sections and multiple hoppers
Solution Approach 1:
The collection system is segmented into multiple functional zones: a first hopper for initial particle collection, a flow switching section for directing gas flow, and a second hopper for additional collection. This segmentation allows each component to perform its specific function optimally, achieving high collection efficiency while maintaining manageable structural complexity through modular design.
Solution Approach 2:
The flow switching section is positioned to preliminarily redirect gas flow before particles reach the electrostatic precipitator. By performing this flow redirection action in advance, the system prepares particles for optimal collection in the hoppers, improving overall collection efficiency without requiring complex real-time control mechanisms.
2Productivity
If a flow switching section is installed in the main duct, then large particle collection efficiency is improved, but pressure loss increases due to flow direction changes
Solution Approach 1:
The flow switching section employs curved surfaces and gradual flow direction changes rather than sharp angles. This curvature design reduces flow separation and turbulence, minimizing pressure loss while effectively redirecting gas flow to enhance large particle collection efficiency in the hoppers.
3Reliability
If multiple hoppers are used to collect large particles, then collection completeness is improved, but maintenance difficulty increases
Solution Approach 1:
The system uses multiple hoppers segmented into distinct collection zones, with each hopper accessible through separate maintenance ports. This segmentation enables independent maintenance of each hopper without shutting down the entire system, improving collection completeness while reducing maintenance difficulty through modular access.
Solution Approach 2:
The hoppers are designed with self-cleaning features and easy-access maintenance ports that allow operators to perform routine maintenance without specialized equipment or extensive system shutdowns. This self-service design maintains high collection completeness while significantly reducing maintenance complexity.
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 significantly enhances the collection efficiency of large particles, reducing toxic emissions and allowing for the use of smaller or replaced electrostatic precipitators, while preventing duct erosion by uniformly distributing particles and ensuring their capture before reaching the electrostatic precipitator.
Implementation Method 1
a flow switching section installed in the main duct in order to increase large particle collection efficiency by switching a flow direction of gas introduced from the inlet duct
Implementation Method 2
a hopper installed in a lower portion of the main duct to collect the large particles
Implementation Method 3
Large particles having a size equal to or greater than 10 μm do not properly follow the movement of fluids. Such motion characteristics of aerosol are affected by inertia according to the size for each particle, and the inertia is proportional to the square of the diameter of the particle
Data Source
AI summary
An apparatus for collecting large particles, such as large particle ash generated during combustion in the thermal power plant, includes a main duct installed between an inlet duct extending in a first direction and an outlet duct extending in a second direction, and connected to the inlet duct and the outlet duct, a hopper installed in a lower portion of the main duct to collect large particles, and a flow switching section installed in the main duct in order to increase large particle collection efficiency by switching a flow direction of gas introduced from the inlet duct.