Pulverizing Device Throat Geometry for Pressure Loss Reduction
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Solution Overview
Problem
Existing pulverizing devices face challenges in suppressing the fall of pulverized particles from the throat while maintaining low pressure loss, leading to increased power requirements.
Innovation Solution
The design includes a throat configuration with specific geometric relationships between the inner and outer rings and throat vanes, such as 2.0≤L/d≤4.0 and 0.5≤H/d≤1.5, along with oblique throat vanes and a flow guide portion, to enhance air flow contraction and reduce pressure loss, effectively preventing particle fall without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flow velocity of carrier gas supplied from the throat is increased to suppress fall of pulverized particles, then the fall amount of pulverized particles is reduced, but the throat pressure loss increases and power consumption increases
Solution Approach 1:
The invention changes the geometric parameters of the throat structure, specifically setting the length-to-gap ratio (L/d) between 2.0 and 4.0, and the gap-to-distance ratio (H/d) between 0.5 and 1.5. These parameter optimizations enable effective air flow contraction and particle suspension without requiring excessive gas velocity, thus reducing pressure loss while maintaining reliability in preventing particle fall.
Solution Approach 2:
The invention introduces a multi-dimensional approach by optimizing three key dimensions: the length of the air flow contraction part (L), the gap between inner and outer rings (H), and the distance between adjacent throat vanes (d). By coordinating these dimensional parameters, the system achieves effective particle control through optimized flow contraction rather than relying solely on increased velocity.
2Reliability
If the flow velocity of carrier gas supplied from the throat is increased to suppress fall of pulverized particles, then the fall amount of pulverized particles is reduced, but the power required for operation increases
Solution Approach 1:
The invention optimizes the geometric parameters of the throat structure, setting the length-to-gap ratio (L/d) between 2.0 and 4.0, and the gap-to-distance ratio (H/d) between 0.5 and 1.5. These parameter optimizations enable effective air flow contraction and particle suspension without requiring excessive gas velocity, thus reducing power consumption while maintaining reliability in preventing particle fall.
3Reliability
If the length of the air flow contraction part is increased to suppress fall of pulverized particles, then the fall amount is reduced, but the throat pressure loss increases
Solution Approach 1:
The invention optimizes the length of the air flow contraction part (L) relative to the gap (H) and vane spacing (d), setting the ratio L/d between 2.0 and 4.0. This optimized length is sufficient to achieve effective flow contraction and particle suspension while avoiding excessive length that would cause unnecessary pressure loss. The balanced parameter selection resolves the contradiction between reliability and energy loss.
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 effectively reduces the fall amount of pulverized particles while minimizing throat pressure loss, thereby maintaining the operational efficiency and power consumption of the pulverizing device.
Implementation Method 1
the air flow is contracted sufficiently inside the throat, and the accelerated air flow is injected from the upper side of the pulverization table
Implementation Method 2
With the kinetic energy of the accelerated air flow, it is possible to keep the pulverized particles above the throat, and to suppress fall from the throat
Implementation Method 3
the to-be-pulverized material is stirred up more frequently, which makes it less likely for the pulverized particles to fall down the throat
Data Source
AI summary
A pulverizing device includes: a housing; a pulverization table configured to rotate inside the housing; and a throat, disposed inside the housing on a radially outer side of the pulverization table, for forming an upward air flow. The throat includes: an inner ring extending along an outer periphery of the pulverization table; an outer ring, disposed on a radially outer side of the inner ring so as to form an annular flow passage between the inner ring and the outer ring; and a plurality of throat vanes disposed between the inner ring and the outer ring. The following expressions are satisfied: 2.0≤L/d≤4.0; and 0.5≤H/d≤1.5, where H is a gap between the inner ring and the outer ring with respect to a radial direction, L is a length of the throat vanes, and ‘d’ is a distance between adjacent two of the throat vanes.