Generator Enclosure Ventilation Layout for Fuel Gas Explosion Risk

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Solution Overview

Problem

The risk of combustion explosion due to fuel gas leakage and accumulation near ventilation fans in power generation units, particularly with combustible fuels like hydrogen, is a significant concern.

Innovation Solution

An enclosure design with a push-in type ventilation fan positioned below the upper end of the side wall, an inclined roof portion to guide leaked fuel gas towards the exhaust port, and strategic placement of components to minimize fuel gas contact with ignition sources, including a partition plate and positioning of fuel pipes and ventilation fan to reduce spark generation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a ventilation fan is installed inside the enclosure to supply air, then ventilation performance is improved, but the risk of combustion explosion increases due to spark generation near fuel gas

Engineering Contradiction:

Improveventilation performanceVSAvoidcombustion explosion risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The ventilation fan is extracted from the internal space and repositioned to the external side of the enclosure. The fan blows air into the enclosure through the upper end of the side wall portion, separating the ignition source (fan) from the fuel gas environment inside the enclosure while maintaining ventilation functionality.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The upper end of the side wall portion serves as an intermediary structure through which air is introduced into the enclosure. This intermediate position allows the ventilation fan to remain outside the enclosure while still providing air supply to the internal space, creating a safety buffer zone.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the ventilation fan is positioned inside the enclosure, then air supply to the power generation unit is improved, but fuel gas may accumulate near the fan creating ignition risk

Engineering Contradiction:

Improveair supply efficiencyVSAvoidsafety against combustion explosion

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The ventilation fan is relocated from the horizontal plane inside the enclosure to the external side, utilizing the spatial dimension outside the enclosure. This dimensional relocation maintains air supply functionality while eliminating the safety hazard of having the fan inside the fuel gas environment.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

Air is supplied to the upper end of the side wall portion before entering the internal space, creating a pre-ventilated zone. This preliminary air supply action ensures that fuel gas does not accumulate near the entry point, reducing ignition risk before the gas reaches the main power generation components.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If a push-in type ventilation fan is used below the upper end of the side wall, then fuel gas accumulation is reduced, but the fan must be positioned in a specific location that may complicate installation

Engineering Contradiction:

Improvefuel gas accumulation preventionVSAvoidinstallation complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The side wall portion serves multiple functions: it provides structural enclosure, acts as a mounting surface for the ventilation fan, and serves as an air intake pathway. This multi-functionality reduces the need for additional separate components and simplifies the overall installation process.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Effectively reduces the risk of combustion explosions by preventing fuel gas accumulation and minimizing contact with ignition sources, enhancing safety in power generation units.

Implementation Method 1

a push-in type ventilation fan configured to push air into the internal space of the enclosure body portion

Methodology Applied

Scientific EffectAirflow generation:

Implementation Method 2

an inclined roof portion to guide leaked fuel gas towards the exhaust port

Methodology Applied

Scientific EffectGravitational convection: Gravitational Convection (non heat)

Data Source

PatentEP4667722A1Enclosure for power generation unit and power generation set

Publication Date: 2025.12.24 MITSUBISHI HEAVY IND ENGINE & TURBOCHARGER LTD

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AI summary

This enclosure for a power generation unit is for accommodating a power generation unit that includes a power generator and a drive device which generates a driving force for rotational driving of the power generator by burning fuel, said enclosure comprising: an enclosure body part that includes a base part on which the power generation unit is mounted, a side wall part which is provided on the base part so as to surround the power generation unit, and a roof part which is provided above the side wall part; an air supply port that is for taking air into an internal space of the enclosure body part surrounded by the base part, the side wall part, and the roof part; an exhaust port that is for discharging air from the internal space; and a push-type ventilation fan that is configured to push air into the internal space of the enclosure body part, wherein the air pushed from the ventilation fan is guided to the internal space via an upper end of the side wall part, and the ventilation fan is provided below the upper end of the side wall part.