Electrolytic Unit Pressure Balancing for Start-Stop Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The continuous operation and frequent start-stop cycles of electrochemical reaction devices lead to performance degradation of electrolysis cell stacks, such as increased cell voltage and decreased product selectivity, necessitating a method to minimize this degradation.
Innovation Solution
A method of operating the electrochemical reaction device by regulating parameters such as temperature, pressure, current density, and fluid composition during startup, operation, and shutdown processes to maintain balanced pressures within the cathode and anode spaces, ensuring the first time-averaged pressure in the cathode space is higher than the anode space, thereby reducing performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous operation or frequent start-stop cycles are performed, then productivity is improved, but reliability deteriorates due to performance degradation of the electrolysis cell stack
Solution Approach 1:
The patent applies preliminary action by performing a specific startup process before normal operation and a shutdown process before storage. The startup process includes regulating parameters to satisfy operation start conditions, and the shutdown process regulates parameters to satisfy storage start conditions. This preliminary preparation prevents performance degradation that would occur from abrupt transitions, thereby maintaining reliability while enabling continuous operation and frequent start-stop cycles.
Solution Approach 2:
The patent employs parameter changes by regulating multiple parameters (temperature, pressure, current density, voltage, fluid composition and flow rate) during different operational phases. Specifically, the method controls parameters during startup, operation, shutdown, and storage processes to maintain optimal conditions. This dynamic parameter adjustment prevents performance degradation of the electrolysis cell stack, allowing both continuous operation and frequent start-stop cycles without compromising reliability.
2Productivity
If pressure differential is increased to improve fluid flow, then productivity is improved, but object-affected harmful factors increase due to potential damage to the electrolysis cell
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting pressure parameters during different operational phases. The method regulates pressure to satisfy specific conditions during startup, operation, shutdown, and storage processes. By controlling pressure differentials within safe ranges and adjusting them appropriately during transitions, the system maintains adequate fluid flow for productivity while preventing excessive pressure that could damage the electrolysis cell structure.
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 effectively minimizes performance degradation of the electrolysis cell stack, maintaining stable operation and product selectivity by controlling pressure differentials within the electrolytic unit.
Implementation Method 1
an operation process of using the electrolytic unit in an operation condition range including the operation start condition to reduce the reducible material in the cathode to produce a reduction product
Implementation Method 2
the electrolytic unit is controlled during each of the startup process, the operation process, and the shutdown process so that a first time-averaged pressure at a first position in the cathode space is equal to or higher than a second time-averaged pressure at a second position in the anode space
Data Source
AI summary
A method of operating an electrochemical reaction device, includes controlling an electrolytic unit during each of a startup process, an operation process, and a shutdown process so that a first time-averaged pressure at a first position in the cathode space and closer to an inlet of a cathode space than an outlet of the cathode space is equal to or higher than a second time-averaged pressure at a second position in an anode space and opposite the first position with a diaphragm therebetween, and a third time-averaged pressure at a third position in the cathode space and closer to the outlet than the inlet is equal to or higher than a fourth time-averaged pressure at a fourth position in the anode space and opposite the third position with the diaphragm therebetween.