Boiler Buffering Mechanism for Seismic Vibration Control
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Solution Overview
Problem
Existing boiler designs fail to mitigate the seismic response of internal elements, such as piping, during earthquakes, as they do not address the relative displacement and resulting vibrations within the boiler drum.
Innovation Solution
A suspended boiler with a buffering mechanism that includes an energy attenuating body and frame fixed to the furnace wall, which compresses and plastically deforms to reduce vibration energy when relative displacement exceeds a predetermined value, thereby reducing seismic response of internal elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If seismic damping devices are provided to restrict relative displacement between the boiler main body and the steel support frame, then the relative displacement between boiler main body and support frame is reduced, but the seismic response of internal elements inside the boiler drum is not addressed
Solution Approach 1:
The damping system is segmented into two independent parts: (1) seismic damping devices between the boiler main body and steel support frame, and (2) buffering mechanisms between internal elements and the furnace wall. This segmentation allows each part to address specific seismic issues independently, resolving the contradiction by enabling targeted protection without requiring a single complex unified system.
Solution Approach 2:
The furnace wall acts as an intermediary structure that introduces buffering mechanisms to protect internal elements. These buffering mechanisms serve as mediators between the vibrating internal elements and the furnace wall, absorbing seismic energy and preventing direct transmission of vibrations to the internal elements, thereby reducing their seismic response without affecting the overall boiler support structure.
2Reliability
If buffering mechanism interferes with internal element to attenuate vibration energy, then seismic response of internal element is reduced, but load transmission path must be carefully designed
Solution Approach 1:
The buffering mechanism is designed with local quality by providing different structural characteristics at different locations. The buffering mechanism includes energy-absorbing elements positioned specifically where internal elements contact the furnace wall, creating localized damping zones. This allows effective vibration attenuation at critical points without requiring complex load distribution across the entire structure, simplifying the overall design.
3Strength
If load on buffering mechanism is transmitted to water pipes, then structural support is provided, but functionality and integrity of water pipes may be compromised
Solution Approach 1:
The load transmission path is extracted from the water pipes by introducing a separate support system. The buffering mechanism transfers loads to the furnace wall structure rather than the water pipes, effectively extracting the water pipes from the load-bearing function. This allows the water pipes to maintain their integrity and primary function while the furnace wall assumes the seismic load transmission role.
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 buffering mechanism effectively attenuates vibration energy, reducing the seismic response of internal elements and ensuring the structural integrity and functionality of the boiler by distributing loads to the fins rather than the water pipes.
Implementation Method 1
an energy attenuating body that compresses to plastically deform due to the interference
Implementation Method 2
attenuates vibration energy when relative displacement, of the internal element with respect to the furnace wall, occurs
Data Source
AI summary
The boiler (1) according to an aspect of the present invention is provided with a boiler main body (3) and a steel support frame (5) that suspends and supports the boiler main body (3). The boiler main body (3) is provided with: a furnace wall (11) composed of water pipes (15) and plate-like fins (16) arranged in an alternating manner; an internal element (4) housed inside the furnace wall (11); and a buffering mechanism (20) configured to attenuate vibration energy when relative displacement, of the internal element (4) with respect to the furnace wall (11), occurs that exceeds a predetermined value. The buffering mechanism (20) is disposed between the furnace wall (11) and the internal element (4) in the main vibration direction of the internal element (4), and the load on the buffering mechanism (20) caused by interference is transmitted to the fins (16).