Carbon Dioxide Recovery Heat-Pump Control for Low-Temperature Startup
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Solution Overview
Problem
Conventional carbon dioxide recovery systems face challenges in achieving rapid startup when outside air temperatures are low, as they require heating the cold water to a predetermined temperature before initiating operations, prolonging the startup time.
Innovation Solution
A carbon dioxide recovery apparatus utilizing a heat pump-type heat source device for both desorbing and absorbing steps, incorporating a heat exchanger with heating and cooling circuits, and a controller to manage heat medium supply, enabling prompt startup even in low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cold water is heated to a predetermined temperature using the exhaust heat of the pump before startup, then the heat pump-type heat source device can operate, but the startup time is prolonged
Solution Approach 1:
The system performs preliminary heating of the cold water using the heat pump during the cooling phase before startup is required. The heat pump heats the cold water to a predetermined temperature in advance, so that when startup is needed, the heating is already complete or near-complete, eliminating the waiting time during actual startup operations.
Solution Approach 2:
The heat pump operates continuously to perform dual functions: first cooling the cold water during the cooling phase, then immediately transitioning to heating the same cold water during the preheating phase. This continuous operation without idle time ensures that the useful action (temperature adjustment) is maintained throughout, maximizing efficiency and minimizing startup delays.
2Loss of time
If the heat pump heats the cold water during cooling, then the startup time is reduced, but the temperature control complexity increases
Solution Approach 1:
The heat pump system dynamically switches between cooling and heating modes based on real-time temperature conditions. The controller monitors the cold water temperature and automatically adjusts the heat pump operation mode, transitioning from cooling to heating when the predetermined temperature is reached, providing adaptive temperature control without requiring complex manual intervention.
Solution Approach 2:
The system incorporates temperature sensors that continuously monitor the cold water temperature and provide feedback to the controller. Based on this feedback, the controller determines when to switch from cooling mode to heating mode, and when to initiate startup operations. This closed-loop feedback control simplifies the overall system complexity by using automatic temperature-based decision-making rather than complex predetermined sequencing.
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
The apparatus allows for rapid startup and efficient carbon dioxide recovery by controlling heat exchange processes, reducing the time required to reach operational conditions despite low outside air temperatures.
Implementation Method 1
a heat pump-type heat source configured to heat the heating heat medium and cool the cooling heat medium
Implementation Method 2
supply and heat a heating heat medium to the module
Implementation Method 3
supply and cool a cooling heat medium to the module
Implementation Method 4
absorbing carbon dioxide onto the adsorbent by drawing a gas containing carbon dioxide
Implementation Method 5
desorbing the carbon dioxide from the adsorbent by heating the adsorbent under reduced ambient pressure
Data Source
AI summary
The present invention provides a carbon dioxide recovery apparatus that is configured to execute a desorbing step and an absorbing step through heat control by a heat pump-type heat source, and is capable of rapid startup even in a case where the outside air is at a low temperature. A heat exchange device of a carbon dioxide recovery apparatus includes: a heat source low-temperature water circuit that includes a cold water tank to store cold water cooled by a heat source device, and configured to circulate cold water between the cold water tank and the heat source device; a hot water feed line connecting a heat source high-temperature water circuit and the heat source low-temperature water circuit; and a control device configured to control the supply of hot water from the heat source high-temperature water circuit to the heat source low-temperature water circuit.