Dehydration Solvent Pump Control for CO2 Moisture Removal
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Solution Overview
Problem
The dehydration-compression system in existing technologies cannot effectively remove moisture from CO2 when the compressor is not in operation, leading to insufficient pressurization of the contactor, which results in CO2 with moisture being discharged and causing corrosion in downstream equipment.
Innovation Solution
A dehydration device with an absorption unit, a still unit, a conveying pump, and a bypass line, controlled by a pressure-detecting system to ensure the dehydration solvent is conveyed even when the contactor is not sufficiently pressurized, using a conveying pump when pressure is low and stopping it when pressure is sufficient to prevent moisture discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compressor is not in operation during startup, then the contactor cannot be sufficiently pressurized, but moisture removal is still required to prevent corrosion in downstream equipment
Solution Approach 1:
The system performs preliminary pressurization of the contactor using a pressurization unit before the compressor starts operating. This allows the dehydration solvent to be conveyed to the still column and the dehydration process to begin in advance, ensuring moisture removal effectiveness from the start without waiting for compressor pressurization.
Solution Approach 2:
A pressurization unit acts as an intermediary device between the environment and the contactor, providing the necessary pressure to convey dehydration solvent and enable the dehydration process to start before the main compressor operates. This intermediary solution resolves the contradiction by providing pressure independently of the compressor's operation status.
2Reliability
If a conveying pump is added to convey dehydration solvent when pressure is low, then moisture removal can proceed during startup, but device complexity increases
Solution Approach 1:
The conveying pump is designed to operate dynamically based on pressure conditions. It automatically starts when the contactor pressure is below a predetermined threshold and stops when pressure is sufficient, allowing the system to adapt its complexity to operational needs rather than maintaining fixed complex structure throughout.
Solution Approach 2:
The control unit continuously monitors the contactor pressure and provides feedback to control the conveying pump's operation. When pressure drops below the threshold, the pump is activated; when pressure is sufficient, the pump stops. This feedback mechanism ensures the pump only operates when necessary, minimizing the impact of added complexity.
3Reliability
If the conveying pump operates continuously, then dehydration solvent is always conveyed to the still column, but energy consumption increases
Solution Approach 1:
The conveying pump operates periodically rather than continuously, activating only when the contactor pressure falls below the predetermined threshold and stopping when pressure is sufficient. This periodic operation maintains reliable dehydration solvent conveyance during critical periods while minimizing energy consumption during normal operation when the compressor provides adequate pressure.
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 solution allows for effective moisture removal from CO2, preventing corrosion in downstream equipment by ensuring continuous operation of the dehydration process even when the contactor is not adequately pressurized by the compressor.
Implementation Method 1
an absorption unit configured to remove the moisture from the process gas by bringing the process gas into contact with a dehydration solvent to cause the dehydration solvent to absorb the moisture
Implementation Method 2
a still unit configured to separate the moisture from the dehydration solvent by heating the dehydration solvent that absorbed the moisture at the absorption unit
Data Source
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AI summary
A dehydration device (60) removes moisture from a process gas compressed by a compressor, and includes a contactor (62) that causes a dehydration solvent to absorb the moisture, a still column (72) that separates the moisture from the dehydration solvent, a carrying line that carries the dehydration solvent from the contactor (62) to the still column (72), a dehydration solvent conveying pump (73), a bypass line that couples the carrying line upstream and downstream of the dehydration solvent conveying pump (73), a first on-off valve (75) disposed in the bypass line, and a control device (90). In a case where the pressure detected by a pressure sensor (69) is lower than a first predetermined pressure, the control device (90) closes the first on-off valve (75) and causes the conveying pump (73) to operate, whereas in a case where the pressure detected by the pressure sensor (69) is equal to or higher than the first predetermined pressure, the control device (90) opens the first on-off valve (75) and causes the conveying pump (73) to stop.