Hydrogen Production Load Control for On-Site Station Demand Swings
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Solution Overview
Problem
Hydrogen production apparatuses at on-site stations face challenges in efficiently managing hydrogen production loads, leading to significant hydrogen gas waste due to continuous operation at rated values, despite varying demand patterns, and existing predictive methods fail to accurately match actual hydrogen demand, resulting in excess gas disposal.
Innovation Solution
Implementing a variable operation load control method for hydrogen production apparatuses, adjusting the load ratios based on actual FCV arrival patterns, starting at a low load, increasing to a higher load during filling, and decreasing back to a lower load after completion, utilizing a multi-stage accumulator system and a control device with processing circuits to manage these changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the hydrogen production apparatus is continuously operated at rated value (100% load) during business hours, then the hydrogen production amount is maximized, but excess hydrogen gas cannot be accumulated in the accumulator and must be discharged to the atmosphere (waste)
Solution Approach 1:
The patent applies dynamics by making the operation load of the hydrogen production apparatus variable rather than fixed. The control device dynamically adjusts the operation load ratio based on real-time accumulator storage state and predicted future demand, switching between high load ratio (when accumulator is not full and demand is high) and low load ratio (when accumulator is full or demand is low), thereby optimizing both production efficiency and waste reduction
Solution Approach 2:
The patent implements feedback control where the control device continuously monitors the accumulator's hydrogen storage state and uses this information to adjust the operation load ratio. The system predicts future hydrogen demand and feeds this prediction back to determine optimal production levels, creating a closed-loop control system that adapts to changing conditions and prevents both waste and shortages
2Loss of substance
If many accumulators are prepared to store one week's worth of hydrogen gas and the production apparatus is stopped when hydrogen is insufficient, then the amount of hydrogen gas to be discarded is reduced, but the facility size becomes excessive
Solution Approach 1:
The patent applies partial action by operating the hydrogen production apparatus at variable load ratios rather than always at full capacity. The system produces hydrogen at high load ratio only when needed (when accumulator is not full and demand is high), and reduces production to low load ratio when the accumulator is sufficiently stocked, thereby avoiding the need for excessive storage capacity while minimizing waste
Solution Approach 2:
The patent changes the operation parameter (load ratio) of the hydrogen production apparatus from a fixed value to a variable value. By adjusting the operation load ratio between high and low levels based on accumulator state and demand prediction, the system optimizes the balance between production volume and storage requirements, eliminating the need for oversized facilities
3Ease of operation
If a method for predicting load by averaging past results is used to create an operation pattern, then the operation can be planned in advance, but the prediction is not always matched with actual situation
Solution Approach 1:
The patent applies preliminary action by predicting future hydrogen demand in advance and using this prediction to proactively adjust the operation load ratio. The control device calculates predicted demand based on historical data and current conditions, then pre-adjusts production levels to match anticipated needs, allowing the system to be prepared in advance while adapting to actual conditions as they develop
Solution Approach 2:
The patent makes the prediction system dynamic by continuously updating the operation load ratio based on real-time accumulator state and changing demand patterns. Rather than relying on static averaged predictions, the system dynamically adjusts production to match actual conditions, improving prediction accuracy while maintaining ease of operation
Data Source
AI summary
An operation method is provided for a hydrogen production apparatus that is disposed in a hydrogen station and produces hydrogen gas to be supplied to a fuel cell vehicle (FCV) arriving at the hydrogen station. The operation method includes starting up a hydrogen production apparatus up to a first operation load ratio preset for a rated operation. The operation method includes increasing an operation load of the hydrogen production apparatus to a second operation load ratio, which is larger than the first operation load ratio, at first timing associated with an arrival of the FCV, and decreasing the operation load of the hydrogen production apparatus to a third operation load ratio, which is smaller than the second operation load ratio, at second timing associated with a completion of hydrogen filling into the FCV.