Nozzle Tip Assembly with Low Contact Frame
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Solution Overview
Problem
Conventional pulverized solid fuel nozzle tip assemblies in boilers suffer from low wear resistance due to the harsh environment of high temperatures and abrasive pulverized coal, leading to frequent failures and increased maintenance costs, as well as stress cracking from thermal expansion differences between materials.
Innovation Solution
A pulverized solid fuel nozzle tip assembly featuring a stainless steel outer nozzle tip portion with a ceramic inner nozzle tip portion, where the outer nozzle tip portion includes a frame with opposing lateral sidewalls and inset lug plates to minimize stress on the ceramic component, and an air shroud for enhanced cooling, allowing for improved tilting range and reduced maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional nozzle tip assembly with outer and inner nozzle tip portions is used, then the structure can provide basic functionality, but thermal expansion causes elements of the outer nozzle tip portion to contact the inner nozzle tip portion, leading to stress cracking and reduced reliability
Solution Approach 1:
The patent removes all extraneous elements from the lateral sidewalls of the outer nozzle tip portion frame, extracting only the essential structural components needed for support and alignment. This elimination of unnecessary elements prevents thermal expansion from causing contact stress on the inner nozzle tip portion, thereby preventing stress cracking while maintaining structural integrity.
2Productivity
If the nozzle tip operates in the harsh environment of high temperatures and abrasive pulverized coal, then it can perform its combustion function, but the abrasive flow rapidly wears away portions of the nozzle tip, leading to low wear resistance and reduced service life
Solution Approach 1:
The patent changes the material parameters of the nozzle tip assembly by using a frame structure with specific geometric parameters (lateral sidewalls with optimized thickness and configuration) that reduce stress concentration points. This parameter optimization, combined with the elimination of extraneous elements, enhances wear resistance and extends service life while maintaining the combustion function.
3Adaptability or versatility
If the nozzle tip assembly is designed with multiple components for functionality, then it can provide tilting adjustment and flow control, but the complexity of thermal growth and contact between components leads to increased maintenance costs and reduced ease of operation
Solution Approach 1:
The patent extracts and removes extraneous elements from the lateral sidewalls of the outer nozzle tip portion, simplifying the overall structure. This reduction in component complexity decreases thermal growth-related contact issues between components, thereby reducing maintenance requirements and improving ease of operation while preserving the essential tilting adjustment capability.
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 provides a nozzle tip assembly with increased wear resistance and extended service life, reduced maintenance costs, and minimized stress cracking, while maintaining the ability to withstand high temperatures and abrasive conditions.
Implementation Method 1
an air shroud for enhanced cooling
Implementation Method 2
the high temperatures of the heat associated with the flame in the combustion chamber and the flow of air provided by the structure of the nozzle tip produce high temperature gradients
Implementation Method 3
Other stresses can arise due to thermal growth or expansion of the components of the nozzle tip assembly
Implementation Method 4
the flow of the highly abrasive pulverized coal through the nozzle tip can rapidly wear away portions of the nozzle tip
Data Source
AI summary
A pulverized solid fuel nozzle tip assembly with a low contact frame for use with a pulverized solid fuel pipe nozzle is described. The pulverized solid fuel nozzle tip assembly has an outer nozzle tip portion adapted to mount in supported relation with the pulverized solid fuel pipe nozzle, and an inner nozzle tip portion adapted for mounting within the outer nozzle tip portion to have secure tiltable movement. The outer nozzle has supporting surfaces that support surfaces of the inner nozzle tip portion to minimize the tilting forces transmitted to the inner nozzle tip portion during normal furnace operation, enhancing the wear resistance of the pulverized solid fuel nozzle tip assembly. The supporting surfaces of the outer nozzle also eliminate stress cracking to the surfaces of the inner nozzle tip portion that can arise due to thermal growth.