Hydrogen Reformer Recycle Path Clogging Detection

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Solution Overview

Problem

The existing hydrogen generation apparatuses face challenges in accurately detecting clogging in the recycle gas flow path due to temperature variations caused by changes in environmental conditions and feedstock gas flow rates, leading to potential erroneous detection and deterioration of the hydro-desulfurization catalyst.

Innovation Solution

A hydrogen generation apparatus equipped with a pressure detection unit and controller that monitors the pressure changes in the recycle gas flow path, using threshold values to determine normal or abnormal flow conditions, thereby preventing catalyst deterioration and ensuring effective sulfur compound removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If temperature detection is used to detect clogging in the recycle gas flow path, then clogging detection is attempted, but temperature variation due to environmental conditions and feedstock gas flow rate changes causes erroneous detection

Engineering Contradiction:

Improveclogging detection accuracyVSAvoiddetection reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent changes the detection parameter from temperature to pressure. By detecting pressure changes in the recycle gas flow path instead of temperature, the system avoids the problem of temperature variations caused by environmental conditions and feedstock gas flow rate changes, thereby achieving reliable clogging detection

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the thermal detection mechanism with a pressure-based detection mechanism. Instead of using a temperature detector to sense clogging, a pressure detector is used to measure pressure changes in the recycle gas flow path, providing a more reliable indication of clogging conditions

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If the recycle gas flow path is not monitored accurately, then the system operates continuously, but the hydro-desulfurization catalyst deteriorates due to sulfur compound accumulation

Engineering Contradiction:

Improvecontinuous operationVSAvoidcatalyst performance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements a feedback control system where the pressure detector continuously monitors the recycle gas flow path and provides information to the control unit. When clogging is detected through pressure changes, the system can respond by adjusting operations to prevent catalyst deterioration, ensuring both continuous productivity and catalyst reliability

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent performs preliminary detection of clogging conditions by monitoring pressure changes before sulfur compounds can accumulate to damaging levels. The control unit detects abnormal pressure patterns that indicate clogging, allowing preventive actions to be taken before the hydro-desulfurization catalyst deteriorates

Inventive Principle:

Principle #10Preliminary action

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 apparatus effectively detects abnormalities in the recycle gas flow path, preventing catalyst deterioration and ensuring reliable sulfur compound removal, thus maintaining the integrity of the hydrogen generation process and downstream fuel cell systems.

Implementation Method 1

a pressure detection unit that detects a pressure change in the recycle gas flow path

Methodology Applied

Scientific EffectPressure detection:

Implementation Method 2

a part of the hydrogen-containing gas generated by the reformer is circulated to a feedstock gas supply path of the hydro-desulfurizer through a recycle gas flow path

Methodology Applied

Scientific EffectPressure differential flow: Pressure Gradient

Data Source

PatentEP3178784B1Hydrogen generation apparatus, operation method thereof, and fuel cell system

Publication Date: 2018.10.10 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

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AI summary

A hydrogen generation apparatus includes a feedstock supply device, a hydro-desulfurizer, a feedstock supply flow path, a reformer, a hydrogen-containing gas flow path, a recycle gas flow path, an ejector, an on-off valve, and an abnormality detection unit. The abnormality detection unit includes a pressure detection unit and a controller. In a case where a detected pressure value of the pressure detection unit in a state in which the feedstock supply device operates for supply and the on-off valve is opened is less than a first threshold value, or in a case where a detected pressure value of the pressure detection unit after the on-off valve is closed from the state in which the feedstock supply device operates for supply and the on-off valve is opened is not a second threshold value or is not lower than the second threshold value that is set to be less than the first threshold value, the controller performs at least one among control of making a determination as abnormality, control of giving a notification of a state or abnormality of the hydrogen generation apparatus, and control of stopping driving of the hydrogen generation apparatus.