Liquid Hydrogen Bypass Pressure Control for Fuel Cell Supply

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Solution Overview

Problem

Existing hydrogen storage systems struggle to accurately adjust the vaporization amount of liquid hydrogen and the pressure in the storage container based on the operation conditions of the fuel cell system, leading to inefficiencies and safety concerns.

Innovation Solution

A hydrogen storage system that includes a storage container, a supply line, a compressor, a bypass line with a control valve and an orifice, and a controller to adjust the bypass flow rate of gaseous hydrogen, allowing for precise control of the vaporization amount and pressure based on internal pressure and operation conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the vaporization amount of liquid hydrogen is increased to meet fuel cell demand, then the hydrogen supply amount is improved, but the pressure in the storage container increases excessively

Engineering Contradiction:

Improvehydrogen supply amountVSAvoidpressure in storage container

Core Design Contradiction:

Quantity of substanceVSStress or pressure

Solution Approach 1:

The system divides the hydrogen supply control into two independent pathways: a main supply line for bulk hydrogen delivery and a bypass line for pressure regulation. The bypass line branches off before the vaporization controller and reconnects after it, allowing separate control of vaporization rate and pressure without interfering with each other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bypass line acts as an intermediary pathway that introduces gaseous hydrogen into the storage container to regulate pressure. By controlling the flow through the bypass line independently of the vaporization process, the system can prevent excessive pressure buildup while maintaining adequate hydrogen supply to the fuel cell.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stress or pressure

If the vaporization amount is reduced to control pressure, then the pressure increase is prevented, but the hydrogen supply to fuel cell becomes insufficient

Engineering Contradiction:

Improvepressure in storage containerVSAvoidhydrogen supply amount

Core Design Contradiction:

Stress or pressureVSQuantity of substance

Solution Approach 1:

The control system is segmented into independent vaporization control and pressure control pathways. The vaporization controller manages the main hydrogen supply to the fuel cell, while the bypass controller independently manages pressure by regulating gas flow back to the storage container.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The controller receives pressure feedback from the storage container and dynamically adjusts the bypass valve opening degree. When pressure exceeds the target range, the controller increases bypass flow to reduce pressure; when pressure is adequate, it reduces bypass flow to maintain supply to the fuel cell.

Inventive Principle:

Principle #23Feedback

3Stress or pressure

If a bypass line is added to control pressure, then the pressure control is improved, but the device complexity increases

Engineering Contradiction:

Improvepressure controlVSAvoidsystem structure

Core Design Contradiction:

Stress or pressureVSDevice complexity

Solution Approach 1:

The bypass line serves multiple functions: it acts as a pressure relief pathway, a gas-phase hydrogen recirculation route, and a control mechanism for maintaining storage container pressure within target ranges. This multi-functionality reduces the need for separate dedicated pressure control devices.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system uses its own gaseous hydrogen output to control its internal pressure through the bypass line. By recirculating a portion of the vaporized gas back into the storage container, the system self-regulates pressure without requiring external pressure control equipment.

Inventive Principle:

Principle #25Self-service

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 system enables accurate adjustment of hydrogen supply to the fuel cell system, improving efficiency, safety, and reliability by preventing excessive pressure increases and hydrogen starvation.

Implementation Method 1

a bypass line connecting the supply line and the storage container and configured to allow the gaseous hydrogen to flow from the supply line to the storage container

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Implementation Method 2

an orifice provided in the bypass line and positioned at a downstream side of the control valve

Methodology Applied

Scientific EffectFlow restriction through orifice:

Data Source

PatentUS12281759B2Hydrogen storage system

Publication Date: 2025.04.22 HYUNDAI MOTOR CO LTD

AI summary

A hydrogen storage system may include a storage container storing liquid hydrogen, a supply line connected to the storage container and to a fuel cell system, the supply line supplying gaseous hydrogen to the fuel cell system from the storage container, a compressor mounted in the supply line and compressing the gaseous hydrogen, a bypass line connecting the supply line and the storage container and allowing the gaseous hydrogen to flow from the supply line to the storage container, a control valve mounted in the bypass line and selectively adjusting a bypass flow rate of the gaseous hydrogen, an orifice provided in the bypass line, and a controller configured to control the control valve, accurately adjusting a supply pressure of the storage container and a supply amount of the hydrogen to be supplied to the fuel cell system based on the operation conditions of the fuel cell system.