Sliding Gasket Sealing for Boiler Protruding Bars

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Solution Overview

Problem

Existing sealing solutions for protruding measurement bars in boiler combustion chambers are inadequate, as they fail to maintain a reliable seal during the insertion and retraction of the bars, especially in the presence of hot and corrosive conditions and thick, harmful flue gases.

Innovation Solution

A sealing arrangement featuring a gasket that slides around the protruding bar and attaches to the combustion chamber wall using magnets, fastening elements, or springs, ensuring a sealed gap during both insertion and retraction of the bar.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a fixed seal is used around the protruding bar opening, then sealing is maintained when the bar is fully inserted, but the seal fails when the bar is retracting or partially inserted

Engineering Contradiction:

Improvesealing reliabilityVSAvoidsealing adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The gasket is designed to move dynamically between two positions: attached to the wall when the bar is inserted, and detached when the bar is retracted. This dynamic behavior allows the seal to adapt to different bar positions, maintaining reliability throughout the entire operational cycle rather than only when fully inserted.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The gasket acts as an intermediary element between the protruding bar and the wall opening. It transfers the sealing function from a fixed position to a movable component that can accommodate bar movement, resolving the contradiction between maintaining seal integrity and adapting to position changes.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If narrow gaps are used between the protruding bar and wall opening, then sealing effectiveness is improved, but thermal expansion and manufacturing tolerances make this impossible to achieve

Engineering Contradiction:

Improvesealing effectivenessVSAvoidgap tolerance

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The gasket functions as a flexible sealing element that can deform and conform to the opening shape. This flexibility compensates for manufacturing tolerances and thermal expansion variations, allowing effective sealing without requiring narrow, precision-gapped arrangements between the bar and wall opening.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The gasket's physical parameters (shape, position, attachment state) change dynamically to maintain sealing effectiveness. Rather than relying on fixed dimensional parameters, the system adapts parameters in real-time to compensate for thermal expansion and manufacturing variations.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the gasket remains attached to the wall during bar retraction, then sealing is maintained, but the gasket cannot accommodate bar movement and sealing fails

Engineering Contradiction:

Improvegap sealingVSAvoidbar movement

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The gasket's attachment state is dynamic rather than static. It attaches to the wall when the bar is inserted (maintaining seal) and detaches when the bar retracts (accommodating movement). This dynamic behavior resolves the contradiction between maintaining seal integrity and allowing necessary bar movement for operational functionality.

Inventive Principle:

Principle #15Dynamics

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 proposed solution effectively minimizes gas leaks and particle emissions by maintaining a sealed gap around the protruding bar throughout its operational strokes, even under conditions of thermal expansion and harsh environmental conditions.

Implementation Method 1

The gasket is preferably attached to the wall of the combustion chamber by at least one magnet attached to the gasket

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Implementation Method 2

The gasket may also be attached to the wall of the combustion chamber by a spring pushing it against the wall

Methodology Applied

Scientific EffectElastic force: Spring

Implementation Method 3

The fastening element may frictionally attach to the gasket

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS20250034808A1A gasket arrangement for a protruding bar of a boiler and a method of operating the gasket arrangement

Publication Date: 2025.01.30 ANDRITZ OY

AI summary

A sealing arrangement of a protruding bar (1) arranged to enter into a combustion chamber (3) of the boiler through an opening (5) of a wall (4) of the combustion chamber (3). The protruding bar (1) is attached to a handling device (10). The sealing arrangement has a gasket (2) for sealing the opening (5). The gasket (2) is slidably arranged around the protruding bar (1) for sealing a gap between the protruding bar (1) and the wall (4) of the combustion chamber so that sealing arrangement is configured to keep the gasket (2) attached to the wall (4) of the combustion chamber (3) while the protruding bar (1) is fully inserted into the combustion chamber (3) and at least a part of time when the protruding bar (1) enters into the combustion chamber (3) and at least a part of time when the protruding bar (1) retracts from the combustion chamber (3).