Hydrogen Grid Injection With Concentration Adjustment and Gas Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for supplying hydrogen to a gas grid increase costs and risk exceeding the specified hydrogen concentration, which can lead to hydrogen embrittlement and require mixing with fossil fuels.
Innovation Solution
A hydrogen supply system comprising a hydrogen production unit, boosting unit, concentration adjustment unit, and mixed gas return unit, which adjusts hydrogen concentration to match grid specifications using grid gas feedback loops and pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogen is supplied from a cylinder through a pressure reducing valve, then hydrogen can be supplied to the fuel cell, but the pressure reducing valve may freeze due to adiabatic expansion and cannot perform pressure reduction
Solution Approach 1:
The pressure reducing valve is nested inside the insulating case that contains the hydrogen storage cylinder. This nesting arrangement allows the valve to be thermally isolated along with the cylinder, preventing freezing while maintaining compact space utilization. The insulating case envelops both the cylinder and valve, creating a shared thermal environment that protects against ambient temperature effects.
Solution Approach 2:
The insulating case is designed to replicate the thermal protection function normally provided by ambient temperature, but in reverse - it actively maintains warmth instead of passive insulation. The case creates a controlled thermal environment that copies the effect of a warm storage space, preventing the valve from freezing without requiring external heating systems.
2Temperature
If an insulating case is provided around the hydrogen storage cylinder, then the cylinder can be prevented from freezing, but the space required for hydrogen storage increases
Solution Approach 1:
The insulating case merges the protective function with the storage structure itself. Rather than adding separate insulation layers or external heating devices, the case is integrated as the primary containment structure, combining thermal protection, mechanical support, and space definition into a single unified component. This eliminates redundant elements and optimizes space utilization.
Solution Approach 2:
The insulating case serves multiple functions simultaneously: it provides thermal insulation to prevent freezing, acts as the structural housing for the hydrogen storage system, defines the overall package volume, and protects internal components from mechanical damage. This multi-functionality reduces the need for additional separate components that would increase overall volume.
3Temperature
If the insulating case is made large to prevent freezing, then the cylinder is protected, but it cannot be stored in a glove box with limited internal space
Solution Approach 1:
The insulating case is designed with optimized dimensional proportions that dynamically balance thermal protection requirements with space constraints. The case thickness and overall dimensions are calculated to provide sufficient insulation while maintaining a compact footprint suitable for glove box storage. The design allows for adjustable or removable insulation layers depending on operational conditions.
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
Enables cost-effective hydrogen supply to the gas grid without exceeding concentration limits, maintaining grid compatibility and allowing for flexible hydrogen demand adjustments.
Implementation Method 1
an insulating case (20) is provided around the hydrogen storage cylinder (12)
Implementation Method 2
there is a risk that the pressure reducing valve (16) may freeze due to adiabatic expansion and cannot perform pressure reduction
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A hydrogen supply system (100) includes a hydrogen production unit (101) which produces hydrogen, a hydrogen boosting unit (102) which boosts a pressure of the hydrogen produced by the hydrogen production unit (101) to a pressure at which the hydrogen can be supplied to a gas grid, a grid gas lead-in unit (103) which leads grid gas from the gas grid (901), a hydrogen concentration adjustment unit (104) which adjusts a mixed gas to have a hydrogen concentration equal to or lower than an allowable hydrogen concentration specified in the gas grid (901), and a mixed gas return unit (105) which supplies the mixed gas to the gas grid.