Angled Diffuser Steam Injection Heater Design
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Solution Overview
Problem
Previous diffuser-type steam injection heaters suffer from poor steam distribution leading to 'hot pockets' and equipment damage due to inadequate sealing and steam flow control, particularly in viscous fluids, resulting in instability and premature wear of components.
Innovation Solution
An angled diffuser configuration with a sonic diffuser and plug arrangement, utilizing a sealing ring and variable hole diameters, along with an external upper chamber seal and filler material, to enhance steam mixing and prevent fluid infiltration, ensuring uniform steam distribution and durable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotary, elastomeric, or pliant seal design is used in the diffuser plug, then steam flow control is achieved, but the seal quickly wears out and extrudes into the diffuser holes
Solution Approach 1:
The sealing function is extracted from the moving plug and relocated to a stationary sealing ring fixed to the diffuser body. This eliminates the relative motion between seal and diffuser holes, preventing extrusion and wear. The sealing ring remains stationary while the plug moves against it, transferring wear to a replaceable component rather than the critical sealing surface.
Solution Approach 2:
Instead of having the seal attached to the moving plug (traditional approach), the seal is inverted to be attached to the stationary diffuser body. This reverses which component experiences wear - the stationary sealing ring instead of the moving elastomeric seal - thereby eliminating the extrusion problem into the diffuser holes.
2Ease of operation
If window-type openings are used in the plug with rotary motion, then steam flow is controlled, but the plug deforms under pressure causing non-uniform gaps and premature failure
Solution Approach 1:
The plug design transitions from a rotary motion system with window openings to a linear motion system with a solid body. The plug moves linearly along the steam flow path, dynamically opening and closing the steam holes without rotational deformation. This eliminates the pressure-induced deformation that caused non-uniform gaps and premature failure in rotary designs.
Solution Approach 2:
The steam flow control function is segmented from the plug body - the plug simply opens/closes pre-formed steam holes in the diffuser body rather than creating flow paths through rotary windows. This separates the structural plug component from the flow control function, eliminating deformation issues.
3Device complexity
If a vertical diffuser configuration is used, then the structure is simple, but steam mixing with fluid is inadequate leading to hot pockets
Solution Approach 1:
The diffuser is angled at approximately 30 degrees from vertical, creating an asymmetric configuration relative to the vertical steam flow. This asymmetry causes the steam jet to impinge at an angle on the fluid stream, enhancing mixing through directional deflection and preventing the formation of symmetric hot pockets that occur with vertical alignment.
Solution Approach 2:
The diffuser orientation adds a horizontal component to the steam injection that was absent in vertical configurations. This dimensional change creates a two-dimensional mixing pattern instead of purely vertical mixing, improving steam distribution uniformity and eliminating hot pockets through enhanced fluid dynamics.
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 angled diffuser design improves steam distribution, reduces equipment damage, and extends the lifespan of components by maintaining uniform steam flow and preventing infiltration, effectively addressing the issues of 'hot pockets' and premature wear.
Implementation Method 1
the diffuser has been angled approximately 30° from vertical to facilitate better mixing of the steam with the fluid
Implementation Method 2
steam flow is controlled using a generally sonic diffuser and plug arrangement
Implementation Method 3
a sealing ring which prevents problems associated with the use of elastomeric rings of existing art
Implementation Method 4
there can be poor steam distribution throughout the fluid to be heated and subsequently 'hot pockets' inside the pipe
Data Source
AI summary
An improved configuration for an in-line direct contact diffuser-type steam injection heater provides for a diffuser whereby steam flow is controlled using an angled sonic diffuser and plug arrangement. The steam flow is controlled by means of a steam plug which selectively exposes holes through which the steam passes. In the preferred embodiment, the configuration provides for a diffuser that had been angled approximately 30° from vertical to facilitate better mixing of the steam with the fluid. The precise angle may be altered depending on the fluid characteristics. A more durable end seal is also used. The end seal is a piston ring which prevents problems associated with the use of elastomeric rings of existing art. A more uniform diameter plug with linear travel is also an improvement over the prior art.