Hydrogen Generator Temperature Control
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Solution Overview
Problem
Existing hydrogen generators face challenges in maintaining the desired hydrogen concentration in the reformed gas due to inconsistencies in the flow rates of the compound and air mixture, leading to suboptimal performance in generating hydrogen for vehicular fuel cell applications.
Innovation Solution
Incorporating a first temperature sensor to control the flow rates of the compound and air mixture by adjusting the oxygen or air flow rates to maintain a set temperature, ensuring the hydrogen concentration in the reformed gas is consistently controlled, with additional temperature sensors to detect potential unit deterioration and optimize the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the flow rates of the compound and air are simultaneously controlled to achieve desired hydrogen concentration, then the hydrogen concentration control is improved, but the system complexity increases and reliability decreases when flow rates are not realized
Solution Approach 1:
The invention changes the control parameter from flow rate (which has reliability issues) to temperature (which is more reliable and easier to control). By controlling the oxidation reaction temperature to a specific range, the system ensures desired hydrogen concentration in the reformed gas without depending on precise flow rate realization.
Solution Approach 2:
The invention replaces the mechanical flow rate control system with a thermal control system. Instead of relying on flow meters and control valves to maintain precise flow rates, the system uses temperature sensors and control to maintain the oxidation reaction at the desired temperature, which indirectly controls the hydrogen concentration.
2Productivity
If the flow rate of the mixed gas is increased to improve productivity, then hydrogen generation rate is improved, but the hydrogen concentration control becomes more difficult
Solution Approach 1:
The invention decouples the relationship between flow rate and hydrogen concentration control by introducing temperature as the primary control parameter. This allows the system to operate at different flow rates (productivity levels) while maintaining consistent hydrogen concentration through temperature control, as long as the oxidation reaction reaches the target temperature range.
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 approach allows for reliable control of hydrogen concentration in the reformed gas, minimizing thermal degradation and ensuring efficient hydrogen generation, even when the intended flow rates of the compound or air are not realized, thereby enhancing the performance of hydrogen generators.
Implementation Method 1
burns part of the compound in the mixed gas in the oxidation unit using the oxygen in the mixed gas so as to generate heat of combustion
Implementation Method 2
utilizes this heat of combustion to break down another part of the compound in the mixed gas in the decomposition unit so as to generate hydrogen
Data Source
AI summary
A hydrogen generator into which a mixed gas is run and out of which a reformed gas including hydrogen is discharged, which can reliably control the hydrogen concentration in the reformed gas to a desired concentration. The hydrogen generator is provided with an upstream side oxidation unit and a downstream side decomposition unit, burns part of the compound in the mixed gas in the oxidation unit using the oxygen in the mixed gas so as to generate heat of combustion, and uses the heat of combustion to break down another part of the compound in the mixed gas in the decomposition unit so as to generate hydrogen. The hydrogen generator is provided with a first temperature sensor controller.