Steam Generator Flushing and Thermal Shock for Scale Removal
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Solution Overview
Problem
Scale and sludge formation in steam generators of fabric treatment appliances due to dissolved substances in household water leads to heat transfer and fluid flow issues, potentially causing premature heater failure.
Innovation Solution
A method involving a steam generation step and a steam generator cleaning step, where the steam generator is flushed with a volume of liquid greater than its internal volume, and thermally shocked to remove scale, using a combination of heating and cooling cycles with controlled flow rates and temperatures to prevent and remove scale and sludge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid is continuously introduced into the steam generation chamber during operation, then scale and sludge formation is prevented, but water consumption increases and fabric treatment efficiency decreases
Solution Approach 1:
The patent implements periodic flushing cycles where liquid is introduced into the steam generation chamber at specific intervals (e.g., every 10-20 steam generation cycles) rather than continuously. This periodic maintenance approach prevents scale accumulation while minimizing disruption to fabric treatment operations, resolving the contradiction between reliability and productivity.
Solution Approach 2:
The patent performs preliminary flushing actions before scale significantly accumulates by monitoring operational parameters (temperature, pressure, flow rate) and initiating cleaning cycles proactively. This prevents scale formation before it impacts efficiency, maintaining both reliability and productivity without requiring continuous liquid introduction.
2Loss of energy
If the steam generation chamber is flushed frequently to remove scale and sludge, then heat transfer efficiency is maintained, but operational time is lost and productivity decreases
Solution Approach 1:
The patent applies partial flushing actions using small volumes of liquid (e.g., 50-200 mL) sufficient to remove incipient scale deposits without requiring complete chamber evacuation or extended downtime. This partial action approach maintains heat transfer efficiency while minimizing operational time loss.
Solution Approach 2:
The patent changes operational parameters during flushing cycles (temperature, pressure, flow rate) to optimize scale removal efficiency. By adjusting these parameters, the system achieves effective cleaning with shorter flushing durations, thereby maintaining heat transfer efficiency while preserving productivity.
3Reliability
If high flow rates are used during flushing to remove scale and sludge, then cleaning effectiveness increases, but water consumption and energy loss increase
Solution Approach 1:
The patent employs dynamic flow rate adjustment during flushing cycles, starting with high flow rates to dislodge scale deposits then reducing to lower flow rates for final rinsing. This dynamic approach achieves effective cleaning while minimizing total water consumption by optimizing flow rates at different stages of the cleaning process.
Solution Approach 2:
The patent uses periodic pulsing of liquid flow during flushing cycles, alternating between high-flow pulses for scale removal and low-flow intervals for water conservation. This periodic action maintains cleaning effectiveness while significantly reducing overall water consumption compared to continuous high-flow flushing.
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
Effectively prevents and removes scale and sludge from the steam generator, maintaining efficient heat transfer and extending the appliance's lifespan by regularly cleaning the steam generation chamber.
Implementation Method 1
heating the liquid in the chamber to create steam
Implementation Method 2
heating and the cooling of the chamber thermally shocks scale formed within the chamber
Implementation Method 3
cooling the heated chamber by introducing liquid into the chamber
Implementation Method 4
heating the liquid in the chamber to create steam
Data Source
AI summary
A method of operating a fabric treatment appliance comprises a steam generation step and a steam generator cleaning step. In the steam generator cleaning step, a chamber of the steam generator can be flushed by introducing a volume of liquid into the chamber greater than the internal volume. The steam generator cleaning step can also involve thermally shocking scale formed within the chamber.