Attemperator Liner Pipe Steam Gap Temperature Control
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Solution Overview
Problem
Conventional attemperators face challenges due to high temperature differences between the liner tube section and the outer tube section, which can lead to mounting issues and potential failure.
Innovation Solution
Incorporating a plurality of openings at the inlet end of the liner pipe section to allow steam to enter the gap between the internal and external wall surfaces, reducing the temperature difference by allowing a fraction of steam to flow and heat the pipe section uniformly, along with a clamp connection at the outlet end for secure attachment and efficient steam flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the liner pipe section is used to protect the steam pipe section from high temperature steam, then the pipe section is protected from overheating, but the temperature difference between the liner pipe section and outer pipe section becomes excessively high causing mounting issues and potential failure
Solution Approach 1:
The gap between the liner pipe section and outer pipe section acts as an intermediary thermal zone. By controlling the steam flow through this gap via openings, the system creates a buffer region that mediates the thermal interaction between the hot liner pipe and the outer pipe, reducing thermal stress and preventing direct thermal shock to the mounting connections.
Solution Approach 2:
The invention changes the thermal parameter distribution by introducing controlled steam flow into the gap region. This modifies the temperature profile between the liner pipe and outer pipe, transitioning from an extreme temperature gradient to a more gradual gradient, thereby reducing thermal stress on mounting components.
2Reliability
If steam is allowed to enter the gap between pipe sections to reduce temperature difference, then mounting reliability improves, but the pipe section may overheat
Solution Approach 1:
The invention applies partial action by allowing only a fraction of the steam to enter the gap between the pipe sections through controlled openings. This partial steam flow is sufficient to reduce the temperature difference and improve mounting reliability, while being limited enough to prevent overheating of the outer pipe section.
Solution Approach 2:
The openings are strategically positioned to create local steam flow paths into specific regions of the gap. This local quality approach ensures that steam is directed where it is most needed to reduce temperature differences at critical mounting points, while maintaining overall thermal control to prevent excessive heating.
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 solution reduces the risk of damage by moderating the heating of the pipe section, ensuring uniform and controlled heating, and providing a robust and secure connection, minimizing stress and overheating risks.
Implementation Method 1
A fraction of the inflowing steam thereby will flow through the openings and come into contact with the internal wall of the pipe section. The temperature of the pipe section thereby will increase
Implementation Method 2
The attemperator sprays cooling water into the flow of the superheated steam in the supply pipe. When mixing with the steam the water evaporates and thereby takes thermal energy from the steam such that it will be cooled
Data Source
Figure 1~3
Figure 2
Figure 4~5
AI summary
The invention relates ton attemperator. It has a pipe section (3) and a liner pipe section (4) arranged within the pipe section (3) and being attached thereto. The pipe section (3) has an internal wall surface (33) and the liner pipe section (4) has an external wall surface (43). The internal wall surface (33) and external wall surface (43) form a gap (6) between them. The pipe section (3) and liner pipe section (4) each has an inlet end (31, 41) for connection to a steam supply and an outlet end (32, 42) for steam. The attemperator is provided with water injection means (2) arranged for supplying water into the interior of the liner pipe section (4). The inlet end (31) of the liner pipe section (4) has an outwardly extending wall portion (44) forming an outer circumferential outer zone (45), which zone (45) may contact the internal wall surface (33) of the pipe section (3). According to the invention there is provided a plurality of openings (47) arranged to 15 allow steam to enter the space formed by the gap (6) between the internal wall surface (33) and the external wall surface (43). The invention also relates to a use of the attemperator.