Adjustable Nozzle Tip for Solid Fuel Burner Adaptability
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Solution Overview
Problem
Existing pulverized solid fuel nozzle tips are limited by a fixed outlet area, which restricts the range of coal types that can be burned since different coal ranks require varying exit velocities for optimal combustion, necessitating costly retrofits to adjust the nozzle tips.
Innovation Solution
A nozzle tip with a selectively adjustable outlet area, allowing for variation in exit velocity by rotating interconnected shrouds to change the cross-sectional area, enabling the burning of different coal ranks without retrofitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the nozzle tip outlet area is fixed, then the structure is simple and manufacturing is easy, but the adaptability to different coal ranks is limited
Solution Approach 1:
The nozzle tip employs movable shrouds that can rotate about their longitudinal axes to dynamically adjust the outlet area. The shrouds are positioned by actuators (such as positioners or motors) that enable continuous variation of the outlet cross-sectional area, transforming the static nozzle structure into a dynamic one capable of adapting to different coal ranks and volatile matter contents.
Solution Approach 2:
The adjustable outlet area mechanism allows a single nozzle tip design to serve multiple functions across different operating conditions. By varying the outlet area, the same nozzle can optimize pulverized coal exit velocity for different coal types (sub-bituminous, bituminous, anthracite), eliminating the need for multiple fixed-nozzle designs and enabling one device to replace several specialized nozzles.
2Adaptability or versatility
If the nozzle tip outlet area is variable, then the adaptability to different coal ranks is improved, but the device complexity increases
Solution Approach 1:
The nozzle tip is divided into segmented components: a body and multiple shrouds that can independently rotate. Each shroud is a separate element that can be manufactured and adjusted independently, allowing modular assembly and simplified manufacturing of the adjustable mechanism compared to a completely redesigned variable geometry nozzle.
Solution Approach 2:
The dynamic adjustment capability is achieved through simple rotational movement of shrouds about their longitudinal axes, driven by positioners or actuators. This mechanical simplicity in the adjustment mechanism reduces manufacturing complexity while maintaining the ability to vary outlet area for different coal ranks.
3Adaptability or versatility
If the nozzle tip is designed for a specific coal rank, then the manufacturing precision can be optimized, but the adaptability to other coal ranks deteriorates
Solution Approach 1:
Rather than manufacturing different precision-critical nozzles for each coal rank, the invention uses a single nozzle body with dynamically adjustable shrouds. The manufacturing precision is concentrated in the fixed nozzle body geometry, while the shrouds provide adjustable modification, allowing high precision for the base design while maintaining adaptability through mechanical adjustment.
Solution Approach 2:
The outlet area parameter is made variable through shroud rotation, allowing the same physically manufactured nozzle to achieve different effective outlet areas. This separates the manufacturing precision requirement from the operational parameter variation, as the precision is built into the fixed components while the variable components provide parameter adjustment.
Data Source
AI summary
A nozzle tip for a pulverized solid fuel pipe nozzle of a pulverized solid fuel-fired furnace is provided. The nozzle tip includes a primary shroud having an inlet end and an outlet end, and an outlet at the outlet end for the passage of a pulverized solid fuel into the furnace. An area of the outlet is selectively adjustable to vary an exit velocity of the pulverized solid fuel from the nozzle tip.