Hydrogen Drying Tower Flow Control for Load-Fluctuating Purification
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Solution Overview
Problem
Conventional hydrogen purification and drying systems struggle to adapt to power fluctuations in renewable energy-based hydrogen production, leading to insufficient regeneration of drying towers and decreased product gas purity during low-power operations.
Innovation Solution
A method involving a drying phase, regeneration phase, and supplemental drying phase, with flow regulation and pressure monitoring to ensure consistent hydrogen stream flow rates, using multiple drying towers and external heating to maintain effective regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional purification systems are designed according to rated working conditions with fixed regeneration loops, then system stability is improved, but adaptability to power fluctuations deteriorates
Solution Approach 1:
The system dynamically adjusts the flow rate of regenerated hydrogen stream based on real-time power generation conditions. The flow rate is no longer fixed at 10-20% of product hydrogen stream, but varies adaptively: during high-power operation it can be increased to maximize regeneration efficiency, during low-power operation it is reduced to match available gas flow, thereby resolving the contradiction between stability and adaptability.
Solution Approach 2:
The key parameter changed is the flow rate of regenerated hydrogen stream. By making this parameter variable rather than fixed, the system can optimize regeneration effectiveness under different operating conditions. The flow rate is adjusted according to power generation load, ensuring sufficient flow during high-power modes while preventing insufficient flow during low-power modes, thus resolving the adaptability issue.
2Loss of energy
If flow rate of regenerated hydrogen stream is reduced during low-power operation, then energy consumption is reduced, but regeneration effect deteriorates
Solution Approach 1:
The system implements feedback control where the flow rate of regenerated hydrogen stream is continuously monitored and adjusted based on actual regeneration effectiveness and power generation conditions. Sensors detect parameters such as dew point and water content in the drying tower, and the control system adjusts the flow rate accordingly. This ensures that the minimum flow rate required for effective regeneration is maintained even during low-power operation, resolving the contradiction between energy reduction and regeneration effectiveness.
Solution Approach 2:
The system performs preliminary assessment of power generation conditions and proactively adjusts the regenerated hydrogen stream flow rate before regeneration effectiveness deteriorates. By predicting low-power conditions and pre-adjusting the flow rate, the system prevents insufficient regeneration while minimizing energy consumption, thus resolving the contradiction between energy loss and regeneration reliability.
3Manufacturing precision
If flow rate of regenerated hydrogen stream is increased to improve regeneration, then product gas purity is improved, but hydrogen output is reduced
Solution Approach 1:
The system dynamically optimizes the flow rate of regenerated hydrogen stream based on real-time product gas quality requirements and hydrogen production targets. During periods when high purity is critical, the flow rate is increased to enhance regeneration effectiveness. During periods when hydrogen output is prioritized, the flow rate is reduced while maintaining adequate regeneration through complementary measures such as adjusting adsorbent temperature or using multiple drying towers in parallel, thus resolving the contradiction between purity and productivity.
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
Ensures stable operation and high-quality hydrogen output by adapting to power fluctuations, maintaining regeneration effectiveness and product gas purity in renewable energy-based hydrogen production systems.
Implementation Method 1
introducing a crude hydrogen stream produced by a hydrogen production system into a primary working drying tower for a first adsorption processing to produce a purified hydrogen stream
Implementation Method 2
introducing a second portion of the purified hydrogen stream into a regeneration drying tower to regenerate an adsorbent thereof to produce a regenerated hydrogen stream and a regenerated adsorbent
Data Source
Figure 1
Figure 2a~2c
Figure 2d~3
AI summary
The present application relates to a method for purifying and drying a hydrogen stream. The method includes a drying phase, a regeneration phase and a supplemental drying phase that are sequentially performed. The supplemental drying phase includes: introducing a regenerated hydrogen stream into a supplemental working drying tower for a second adsorption processing to produce a dried regenerated hydrogen stream; directing the dried regenerated hydrogen stream through a draw-off pipeline for the dried regenerated hydrogen gas stream, and monitoring a draw-off flow rate of the dried regenerated hydrogen stream; and increasing an opening degree of a flow regulating valve for the regenerated hydrogen stream on the draw-off pipeline for the dried regenerated gas stream or reducing an opening degree of a flow regulating valve for the regenerated hydrogen stream on a draw-off pipeline for the product gas stream when the draw-off flow rate of the dried regenerated hydrogen stream is less than a threshold, so as to increase a flow rate of the regenerated hydrogen stream introduced into a regeneration drying tower. The present application can effectively adapt to load fluctuation of hydrogen output in renewable energy-based hydrogen production, ensuring the normal operation of a purification process system.