Cyclone Separator Geometric Optimization for High Velocity Particle Capture
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Solution Overview
Problem
Cyclone separators used in circulating fluidized bed boilers face challenges in maintaining capture efficiency for small particles at higher axial velocities, leading to increased pressure drop and reduced efficiency, and existing solutions that address this issue result in costly and tall cyclone designs that complicate system arrangement.
Innovation Solution
A cyclone separator design with specific geometric ratios, including a cylindrical body, inlet duct, and gas outlet tube, optimized to minimize direct particle leakage and maintain high capture efficiency at higher velocities, featuring ratios such as d/D ≥ 0.1, s/S between 0.24 and 0.32, and h/w ≤ 4, which allows for reduced body diameter and height, thus reducing costs and system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the diameter of the cyclone separator is reduced to increase axial mean velocity, then the pressure drop across the cyclone increases strongly, but the capture efficiency decreases when trying to keep the pressure drop at a constant limited value
Solution Approach 1:
The patent changes the geometric parameters of the cyclone separator, specifically the ratio of inlet width to body diameter (w/D ≥ 0.4) and the ratio of inlet height to inlet width (h/w between 0.5 and 1.5), to optimize performance at high velocities while maintaining acceptable pressure drop and capture efficiency
Solution Approach 2:
The patent optimizes the cyclone separator for dynamic operation at high axial velocities (≥7 m/s) by adjusting the geometric parameters to maintain stable vortex flow and particle separation efficiency under high-speed conditions
2Reliability
If the ratio height/depth of the inlet opening is increased to at least 4/1 to maintain capture efficiency at 8 m/s, then the inlet duct becomes more costly due to stiffening needs and the cyclone barrel must be higher, increasing overall cost and system arrangement complexity
Solution Approach 1:
The patent optimizes the inlet geometry parameters, specifically setting the width-to-diameter ratio (w/D) to at least 0.4 and the height-to-width ratio (h/w) between 0.5 and 1.5, which allows achieving high capture efficiency at 8 m/s without requiring excessively tall or complex inlet structures
Solution Approach 2:
The patent applies specific geometric ratios locally at the inlet section (w/D and h/w ratios) to optimize flow distribution and particle separation efficiency, avoiding the need for overall increases in cyclone height or complex inlet duct designs
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 design achieves high capture efficiency for small particles at velocities up to 8 m/s with reduced pressure drop and cyclone size, enabling efficient particle separation while minimizing costs and system height, facilitating easier arrangement and operation.
Implementation Method 1
Cyclonic separation is a method of removing particulates from gases, without the use of filters, through vortex separation. Rotational effects and gravity are used to separate mixtures of solids and gases.
Implementation Method 2
Rotational effects and gravity are used to separate mixtures of solids and gases.
Data Source
Figure 1~3
AI summary
The invention is related to a cyclone separator (1) for particle collection from a gas stream containing entrained solid particles, said cyclone separator (1) comprising: - a cylindrical-shaped body portion (3), - an inlet duct (2) having an intrados face (2a) and an extrados face (2b), and which is connected to the body portion (3), - a gas outlet tube (4) connected to the body portion (3) at its upper end, characterized in that: - the ratio (d/D) of the distance (d) between the parallel to the extrados face (2b) dropped from the tip (T) of the cyclone separator (1) and the closest point of the gas outlet tube (4) to the internal diameter (D) of the body portion (3) is superior or equal to 0.1, said distance (d) being measured at the lower extremity (4a) of the gas outlet tube (4), - the ratio (s/S) of the inlet duct area (s), measured at the tip (T) of the cyclone separator (1) and perpendicularly to the extrados face (2b), to the cross-sectional area (S) of the body portion (3), is comprised between 0.24 and 0.32, and - the ratio (h/w) of the height (h) of the inlet duct (3) to the width (w) of the inlet duct (2) at the tip (T) of the cyclone separator (1) does not exceed 4.