Integrated Anode Recirculation Unit for Fuel Cell Cold Starts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel cell systems face inefficiencies and reliability issues due to complex flow connections between components, leading to flow losses, leakage, and rapid cooling, which affects the cold start capability and service life.
Innovation Solution
A delivery unit with a recirculation blower, jet pump, and separator integrated within a common housing, minimizing flow deflections and using centrifugal principles to separate heavy components, reducing the need for external piping and heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If components are connected by pipes and arranged as separate assemblies, then flexibility in assembly is improved, but flow losses increase due to numerous flow deflections
Solution Approach 1:
The patent integrates the recirculation blower, jet pump, and metering valve into a single common housing with internal flow channels, eliminating external pipe connections. This merging of components reduces the number of flow deflections and connections, thereby minimizing flow losses while maintaining manufacturing feasibility through modular housing design.
2Ease of repair
If components are connected by pipes, then individual component replacement is improved, but leakage problems increase over service life
Solution Approach 1:
By integrating components into a common housing with internal channels, the patent eliminates external pipe connections that are prone to leakage. The unified structure reduces leakage points while maintaining repairability through modular component access designs.
3Temperature
If components are arranged as separate assemblies with large surface area, then heat dissipation is improved, but rapid cooling occurs during idle periods
Solution Approach 1:
The patent consolidates multiple components into a single common housing, significantly reducing the total external surface area. This reduced surface area minimizes heat loss to the environment during idle periods, preventing rapid cooling and maintaining operational temperature, thereby improving cold start capability.
4Ease of operation
If components are arranged as separate assemblies, then individual component access is improved, but heating energy requirements increase during cold start
Solution Approach 1:
By integrating components into a common housing, the patent reduces the total volume and surface area requiring heating during cold start. The unified structure requires less heating energy to reach operational temperature compared to heating multiple separate assemblies, while component accessibility is maintained through designed access points.
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
This design enhances efficiency, reduces leakage and flow losses, improves cold start performance, and extends the service life by minimizing ice bridge formation and energy consumption.
Implementation Method 1
a recirculation blower (8) having a compressor wheel (12), wherein heavy components of the gaseous medium are separated from the gaseous medium in the recirculation blower (8) by means of a centrifugal principle
Implementation Method 2
the separator (10) conveys the heavy components of the gaseous medium discharged from the recirculation blower (8) out of the anode circuit (9)
Implementation Method 3
heavy components of the gaseous medium are separated from the gaseous medium in the recirculation blower (8) by means of a centrifugal principle
Implementation Method 4
a jet pump (4) which is driven by a propulsion jet of a pressurized gaseous medium
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed is a delivery unit (3) for an anode circuit (9) of a fuel cell system (1) for delivering a gaseous medium, in particular hydrogen, from an anode region (38) of a fuel cell (2), said delivery unit (3) comprising at least one recirculation fan (8) and being at least indirectly fluidically connected to the outlet of the anode region (38) by means of at least one connection line (23) and being fluidically connected to the inlet of the anode region (38) by means of an additional connection line (25). According to the invention, in addition to the recirculation fan (8), the delivery unit (3) comprises a jet pump (4), a metering valve (6) and a separator (10) as other components, and the flow contours of the components (4, 6, 8, 10) for the gaseous medium are at least almost entirely arranged in a common housing (7).