Classifier Deflector Ring Liners for Pulverizer Wear
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Solution Overview
Problem
Pulverizer systems face challenges with coal having high ash content and degraded Hardgrove Grindability Index (HGI), leading to increased milling requirements, auxiliary power consumption, and frequent maintenance due to wear issues, while existing classifiers struggle with fineness control and retention time.
Innovation Solution
A classifier with an annular body, deflector ring, and reject cone configuration, combined with abrasion-resistant liners, improves wear life, fineness control, and coal flow efficiency, allowing for longer operation without servicing and higher coal throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional milling operations are performed to grind coal with high ash content and degraded HGI to desired fineness, then coal processing capability is improved, but auxiliary power consumption increases
Solution Approach 1:
The patent employs a dynamic classifier with adjustable vanes that can change position to control particle separation. This dynamic adjustment allows optimization of classification efficiency without requiring additional milling operations, thereby maintaining desired coal fineness while reducing auxiliary power consumption compared to static classification systems that would require re-milling undersized particles.
2Manufacturing precision
If additional milling operations are performed on harder coal with degraded HGI, then desired fineness is achieved, but wear rate of pulverizer parts increases
Solution Approach 1:
The patent implements a preliminary classification stage before the main milling process. By pre-separating particles that have already reached desired fineness through flash drying and initial size reduction, the system prevents these adequately sized particles from undergoing additional wear-inducing milling operations, thereby reducing overall wear rate while maintaining coal fineness requirements.
3Manufacturing precision
If static classifier is used to separate particles, then fine particles can flow out while coarse particles are restricted, but fineness control and retention time are insufficient
Solution Approach 1:
The patent replaces the static classifier with a dynamic classification system featuring adjustable vanes that can be positioned to control particle separation thresholds. This dynamic mechanism enables precise fineness control by adjusting vane positions to match desired particle size distributions, while also optimizing retention time by controlling when particles are separated from the mill stream, overcoming the limitations of fixed static classification.
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 solution enhances wear life, stability, and efficiency, reducing the need for frequent maintenance and increasing coal flow rates while maintaining desired fineness, thus improving overall pulverizer performance.
Implementation Method 1
a classifier that separates particles using centrifugal force generated by a swirling flow
Implementation Method 2
the deflector ring is configured to receive the plurality of swirling flows of particles circulating about the annular body, wherein the outlet housing is configured to receive fine particles in the plurality of swirling flows of particles that are directed upward from the deflector ring
Data Source
AI summary
A classifier comprising deflector ring having an interior sidewall liner affixed to an interior sidewall of deflector ring and an exterior sidewall liner affixed to an exterior sidewall of deflector ring, outlet housing, a base region formed on a top surface of deflector ring, outlet housing sidewalls, each extending away from an edge of deflector ring, and a top region parallel to base region joined with each angled sidewalls, top region having an upper surface with one or more openings formed therein corresponding to one or more outlet channels, wherein outlet housing further comprises an interior sidewall liner affixed to each of opposing angled sidewalls, each interior sidewall liner extending from a corresponding edge of deflector ring to a respective portion of top region, and an upper wall liner extending along all of inner wall between one or more openings.