Vertical HRSG Filter Support Structure for Thermal Expansion

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Solution Overview

Problem

Conventional environmental facilities in HRSGs face inadequate thermal expansion response and safety issues due to the installation of filters inside the heat exchange area, affecting structural stability and maintenance.

Innovation Solution

A thermal expansion absorbing structure is introduced, comprising supporting parts, fixing parts with movable connections, seated members, and filter members, allowing for active response to thermal displacement and ensuring structural stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If environmental facilities are installed inside the HRSG heat exchange area, then space utilization is improved, but thermal expansion response capability deteriorates

Engineering Contradiction:

Improveinstallation space utilizationVSAvoidthermal expansion response capability

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The environmental facility is divided into two separate spaces: the filter housing is located outside the HRSG while the filter element is positioned inside the heat exchange area. This segmentation allows the external housing to remain stable while the internal filter element can move with thermal expansion, resolving the contradiction between space utilization and thermal expansion response.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A movable connection mechanism acts as an intermediary between the external filter housing and the internal filter element. This intermediary allows relative movement between the two parts, enabling the filter element to respond to thermal expansion while maintaining connection to the stationary housing, thus solving both space utilization and thermal expansion response requirements.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If environmental facilities are installed inside the HRSG, then compactness is improved, but maintenance accessibility deteriorates

Engineering Contradiction:

Improveinstallation compactnessVSAvoidmaintenance accessibility

Core Design Contradiction:

Device complexityVSEase of repair

Solution Approach 1:

By separating the filter housing (external) from the filter element (internal), the design allows the accessible external housing to remain in place while only the filter element needs to be removed for maintenance. This segmentation improves maintenance accessibility while preserving the compact integrated appearance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The filter element is extracted as a separate removable component from the filter housing. This allows the filter element to be easily accessed and replaced through the external housing opening without disassembling the entire HRSG structure, thus improving maintenance accessibility while maintaining compact installation.

Inventive Principle:

Principle #2Taking out (Extraction)

3Stability of the object's composition

If fixed connection structure is used for environmental facilities, then structural stability is improved, but adaptability to thermal displacement deteriorates

Engineering Contradiction:

Improvestructural stabilityVSAvoidadaptability to thermal displacement

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The connection between the filter housing and filter element is made dynamic rather than fixed. The movable connection mechanism allows the filter element to move relative to the housing in response to thermal expansion, providing adaptability to thermal displacement while maintaining structural stability through the constrained movement path.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The connection parameters are changed from fixed positional constraints to constrained movement constraints. The movable connection allows specific degrees of freedom (thermal expansion movement) while maintaining stability in other directions, thus adapting to thermal displacement while preserving structural integrity.

Inventive Principle:

Principle #35Parameter changes

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 structure secures structural stability and safety by absorbing thermal expansion, facilitating maintenance and repair of vertical HRSGs, particularly in ultra-supercritical pressure conditions.

Implementation Method 1

a thermal expansion absorbing structure for an environmental facility of the vertical heat recovery steam generator

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS20250297558A1Environmental facility supporting structure of vertical heat recovery steam generator

Publication Date: 2025.09.25 DOOSAN ENERBILITY CO LTD

AI summary

An environmental facility supporting structure of a vertical heat recovery steam generator is proposed. The environmental facility supporting structure includes a plurality of supporting parts, a plurality of fixing parts into which the plurality of supporting parts is inserted vertically and each having an extending part on at least one side portion, a seated member seated on the extending parts provided in the plurality of fixing parts, and a plurality of filter members provided at an upper portion of the seated member. The plurality of fixing parts is connected to the plurality of supporting parts to be movable according to vertical displacement.