Monotube Steam Generator Scale Deposit Reduction
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Solution Overview
Problem
Conventional steam production methods, such as immersion boiling and open pan boiling, are prone to scale deposit buildup due to metal ions in the water, leading to reduced appliance lifespan and increased maintenance costs.
Innovation Solution
A monotube heating unit design that converts liquid into a two-phase flow with a predetermined ratio of turbulent to laminar flow, passing the turbulent flow at a sufficient velocity to carry impurities through the monotube and produce steam, while maintaining a Reynolds number greater than 2000 and heating the liquid below the Leidenfrost temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If immersion boiling or open pan boiling is used to produce steam, then steam production capacity is achieved, but scale deposit buildup occurs due to metal ions in water
Solution Approach 1:
The patent extracts and removes impurities (metal ions causing scale deposits) from the water stream before the water contacts the heating element. This is achieved through a filtration system that separates impurities from the water, allowing clean water to be heated and converted to steam while contaminants are discharged separately, thus preventing scale buildup on heating surfaces.
Solution Approach 2:
The patent introduces an intermediary filtration system between the water supply and the heating element. This intermediary component (filter) mediates the interaction between water and heating surface by removing impurities, preventing direct contact between contaminants and the heating element, thereby eliminating scale deposit formation while maintaining steam production.
2Object-generated harmful factors
If acid solution is used to flush the vat to dissolve deposits, then scale deposits are removed, but servicing becomes inconvenient and is generally neglected
Solution Approach 1:
The patent implements a self-service system where the filtration apparatus automatically removes impurities from the water stream without requiring manual intervention. The system continuously filters water before it reaches the heating element, eliminating the need for periodic acid flushing and manual servicing, thus making maintenance convenient and consistent.
Solution Approach 2:
The patent performs preliminary action by removing impurities from water before the water contacts the heating element. This preventive filtration occurs continuously in advance, preventing scale deposit formation rather than requiring subsequent removal actions, thereby eliminating the need for inconvenient periodic servicing.
3Object-generated harmful factors
If water treatment is used to reduce or eliminate ions, then scale deposit buildup is reduced, but treatment cost increases and servicing may still be required
Solution Approach 1:
The patent employs a cost-effective filtration system using disposable or easily replaceable filter elements that capture metal ions and impurities from water. These filters are inexpensive compared to water treatment chemicals or ion exchange systems, providing continuous impurity removal at low cost without requiring complex treatment processes or ongoing servicing.
4Quantity of substance
If monotube steam generator is sized to reduce material consumption, then material usage is minimized, but diameter is reduced to accommodate fluid flow
Solution Approach 1:
The patent optimizes the monotube dimensions by carefully selecting the inner diameter and length parameters to achieve the desired steam production capacity while minimizing material usage. The tube diameter is sized to maintain adequate fluid flow velocity for effective heating and steam generation, balancing material consumption with functional performance through parameter optimization.
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
This design effectively reduces scale deposit buildup, enhances steam production capacity, and minimizes maintenance needs by ensuring that impurities are carried through the system, thereby extending the lifespan of the heating unit and reducing operational costs.
Implementation Method 1
heating the liquid to a predetermined temperature below a Leidenfrost temperature for the liquid
Implementation Method 2
The received liquid is converted into a two phase flow including turbulent and laminar flows. At least the turbulent flow is passed through the lumen at a velocity sufficient to carry the impurities through an exit port of the monotube
Implementation Method 3
The received liquid is converted into a two phase flow including turbulent and laminar flows... and produce steam
Data Source
AI summary
The invention relates to a method and system for producing steam in a heating unit, and a method of designing a heating unit for producing steam. The method relates to receiving a liquid including impurities at a predetermine flow rate within an entry port of a monotube in the heating unit, where the monotube has a lumen of a predetermined size. The received liquid is converted into a two phase flow including turbulent and laminar flow. At least the turbulent flow is passed through the lumen at a velocity sufficient to carry the impurities through an exit port of the monotube and produce steam. The velocity of the turbulent is responsive to at least the predetermined flow rate and predetermined size of the lumen.