Retractable Articulating Robotic Sootblower Cleaning Range
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Solution Overview
Problem
Conventional sootblowers have limited cleaning ranges and energy inefficiencies due to fixed nozzle positions, leading to inadequate cleaning of boiler surfaces and potential damage from steam or water jets, along with high installation costs and maintenance challenges in hostile boiler environments.
Innovation Solution
A sootblower with a retractable lance tube and articulating wrist, allowing for multidirectional cleaning by rotating about both longitudinal and transverse axes, coupled with a motor-driven system for controlled movement and cooling of components, reducing energy consumption and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional sootblowers use fixed nozzle positions on the lance tube, then the structure is simple, but the cleaning range is limited and cannot cover all nearby surfaces
Solution Approach 1:
The patent applies the dynamics principle by making the nozzle articulation mechanism movable rather than fixed. The nozzle is mounted on an articulating wrist that can rotate about transverse and longitudinal axes, allowing dynamic adjustment of the nozzle direction to cover multiple surfaces. This transforms the static fixed-position nozzle into a dynamic multi-position nozzle, resolving the contradiction between simple structure and limited cleaning range.
Solution Approach 2:
The patent applies the dimensionality change principle by adding rotational freedom in multiple dimensions. The nozzle can rotate about a transverse axis (first axis of rotation) and a longitudinal axis (second axis of rotation), transitioning from one-dimensional fixed positioning to two-dimensional articulation. This enables the nozzle to direct cleaning fluid at various angles to clean different surfaces within the boiler, significantly expanding the cleaning range without excessive complexity.
2Productivity
If conventional sootblowers operate continuously to maintain cleaning, then cleaning coverage is sufficient, but energy consumption increases
Solution Approach 1:
The patent applies the periodic action principle by operating the sootblower in periodic cycles rather than continuously. The lance tube is periodically advanced into and withdrawn from the boiler, with the nozzle articulating during these cycles to clean specific surfaces. This periodic operation with strategic articulation maintains adequate cleaning coverage while significantly reducing energy consumption compared to continuous operation, resolving the contradiction between productivity and energy use.
3Productivity
If high-pressure steam or water jets are used for cleaning, then encrustation removal is effective, but thermal shock damage occurs to boiler surfaces and steam tubes
Solution Approach 1:
The patent applies the local quality principle by directing high-pressure cleaning fluid locally at specific encrustation areas rather than broadly across entire surfaces. The articulating nozzle can be precisely positioned to target localized deposits, allowing effective removal of encrustations while minimizing the overall impact on boiler surfaces. This localized approach reduces thermal shock damage while maintaining cleaning effectiveness.
Solution Approach 2:
The patent applies the blessing in disguise principle by using the cleaning fluid not only to remove encrustations but also to cool the lance tube and articulating wrist components during operation. The same fluid that cleans the boiler surfaces also serves to cool the sootblower components, converting a potential harmful effect (thermal shock) into a beneficial cooling mechanism, thereby reducing damage to both boiler surfaces and cleaning equipment.
4Adaptability or versatility
If multiple adjacent sootblowers are installed to cover all surfaces, then cleaning coverage is complete, but installation cost and complexity increase
Solution Approach 1:
The patent applies the universality principle by designing a single sootblower unit with multi-functional capabilities. The articulating wrist enables the single nozzle to perform multiple cleaning functions by rotating to different positions, effectively replacing the need for multiple fixed sootblowers. This multi-functional design achieves complete surface coverage with one unit, reducing installation cost and system complexity while maintaining comprehensive cleaning coverage.
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 sootblower achieves comprehensive, efficient cleaning of boiler surfaces with reduced energy use and lower maintenance costs, minimizing damage to boiler components and surfaces through its enhanced cleaning range and cooling mechanisms.
Implementation Method 1
The cleaning medium supplied to the nozzle cools the articulating wrist during operation of the sootblower
Data Source
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AI summary
A sootblower is provided having a multidirectional cleaning range for directing a cleaning medium against heated surfaces in a heat exchanger. The sootblower includes a rotatable lance tube that is selectively advanced and withdrawn along a longitudinal axis from an interior volume of the heat exchanger. The lance tube includes an articulating wrist coupled to a nozzle for projecting the cleaning medium in multi-directions onto the heated surfaces when the lance tube is advanced into the heat exchanger. The nozzle is pivotable about the longitudinal axis and about a second axis transverse to the longitudinal axis.