Pressure Accumulator Dynamic Pressure Control for Temperature Swings
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Solution Overview
Problem
Pressure storage devices, such as high-pressure hydrogen storage systems, face challenges in maintaining optimal storage pressures due to temperature fluctuations, leading to potential damage from overpressures or underutilization of capacity, as existing solutions either over-dimension the system or fail to consistently avoid temporary overpressures.
Innovation Solution
A dynamic reference temperature method with time-dependent adjustments is implemented to regulate the operating pressure in pressure storage devices, ensuring that the storage pressure is maximized while avoiding overpressures by using predefined dynamic reference temperature values that change over time, thereby optimizing storage capacity utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the storage pressure is set to the maximum operating pressure (e.g., 300 bar) to maximize storage capacity, then the storage capacity is optimized, but temperature-induced overpressures occur when temperature increases (e.g., reaching 342 bar at 40°C)
Solution Approach 1:
The system performs preliminary action by determining a dynamic operating pressure in advance based on predicted temperature values before the actual storage operation. This allows the system to pre-calculate the maximum safe storage pressure for upcoming time periods, preventing overpressure conditions before they occur by adjusting the storage pressure proactively rather than reactively.
Solution Approach 2:
The system applies dynamics by transitioning from a static operating pressure to a dynamic operating pressure that varies with temperature conditions. The dynamic operating pressure is continuously adjusted based on predicted temperature values, allowing the storage system to adapt its pressure limits in real-time to prevent overpressure while maximizing storage capacity under varying thermal conditions.
2Object-affected harmful factors
If the operating pressure is reduced to account for temperature increases, then overpressures are avoided, but storage capacity is underutilized during cooler periods
Solution Approach 1:
The system uses dynamics to adjust the operating pressure according to predicted temperature conditions. During cooler periods, the dynamic operating pressure is increased to maximize storage capacity, while during warmer periods, it is reduced to prevent overpressure. This dynamic adjustment ensures optimal storage capacity utilization at all times without compromising safety.
Solution Approach 2:
The system applies parameter changes by modifying the operating pressure parameter based on temperature predictions. Instead of using a fixed operating pressure, the system continuously adjusts this parameter according to predicted temperature values, allowing the storage capacity to be optimized for each specific thermal condition while maintaining safety margins.
3Ease of operation
If a static reference temperature is used to determine operating pressure, then the system is simple to operate, but it cannot adapt to temperature fluctuations and may experience overpressures or underutilization
Solution Approach 1:
The system implements feedback by continuously monitoring actual temperature values and comparing them with predicted temperature values. This feedback mechanism allows the system to adjust the dynamic operating pressure in response to temperature deviations, ensuring that the storage pressure remains within safe limits while maximizing capacity utilization across varying thermal conditions.
Solution Approach 2:
The system uses preliminary action by determining the dynamic operating pressure in advance based on predicted temperature values before storage operations begin. This proactive approach allows the system to prepare appropriate pressure settings for upcoming temperature conditions, simplifying operation by providing pre-calculated pressure targets while maintaining adaptability to temperature fluctuations.
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 prevents or minimizes temperature-induced overpressures, eliminates the need for over-dimensioning of storage devices, and ensures maximum energy storage capacity is utilized during consumption phases without exceeding the manufacturer-specified static operating pressure.
Implementation Method 1
When hydrogen is stored, it can, for example, get or be stored with pressures up to 700 bar in the pressure storage device
Implementation Method 2
The pressure in pressure storage systems varies as a function of the temperature, for example the ambient temperature and/or the storage temperature. In this case, a temperature-induced pressure rise behaves proportionally.
Data Source
AI summary
The present invention relates, inter alia, to a method for storing a medium, in particular a gas, in a pressure storage device (31), wherein, in a preferred embodiment, a dynamic operating pressure, which is dependent on measured temperature values and up to which the medium can be stored in the pressure storage device (31), is determined. In particular, the invention allows dynamic storing of medium in the pressure storage device (31) in respect of the storage pressure, in particular the operating pressure, with a simple design. This is achieved by the dynamic operating pressure being determined, in particular calculated, on the basis of dynamic reference temperature values as a function of time. The method is preferably carried out in an energy system (10), having at least one energy source device (21) for generating a medium and a pressure storage device (31), spatially separated therefrom, for storing the generated medium.