Dry CO2 Capturing Device Closed-Loop Heat Recovery
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Solution Overview
Problem
The existing dry CO2 capturing devices face inefficiencies in energy usage and thermal contamination due to the direct discharge of hot wastewater, which affects aquatic species and increases energy consumption in large-scale plants.
Innovation Solution
A dry CO2 capturing device is designed with a closed-loop heat exchanger system that transfers heat from the pre-treatment operation to the regeneration operation, utilizing a difference in temperature to enhance energy efficiency and reduce thermal contamination by circulating a heat transfer medium between heat exchangers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steam is used as heat supplying medium in the regenerator, then CO2 separation efficiency is improved, but energy consumption increases significantly
Solution Approach 1:
The invention converts the harmful hot waste water into a useful heat source by utilizing its thermal energy to pre-heat the sorbent material before it enters the regenerator. This reduces the energy required for CO2 separation by approximately 30-50% while maintaining separation efficiency.
Solution Approach 2:
The invention performs preliminary heating of the sorbent material using hot waste water before the actual regeneration process. This pre-treatment step reduces the thermal load on the regenerator and decreases overall energy consumption while maintaining CO2 separation efficiency.
2Ease of operation
If hot waste water is discharged directly to the outside, then cooling requirement is simplified, but thermal contamination occurs affecting aquatic species
Solution Approach 1:
The invention converts the harmful thermal pollution into a beneficial resource by using the hot waste water to pre-heat the sorbent material. This eliminates thermal contamination of aquatic environments while recovering valuable thermal energy that would otherwise be wasted.
Solution Approach 2:
The invention introduces an intermediary heat exchange system where hot waste water transfers its thermal energy to the sorbent material through heat exchangers. This intermediary process allows energy recovery while preventing direct discharge of hot water into the environment.
3Reliability
If pre-treatment reactor cools the solid sorbent, then CO2 adsorption efficiency is improved, but energy consumption increases
Solution Approach 1:
The invention converts the cooling requirement into an energy recovery opportunity by using the thermal energy from the regenerator to pre-cool the sorbent material before it enters the pre-treatment reactor. This reduces the energy needed for cooling while maintaining CO2 adsorption efficiency.
Solution Approach 2:
The invention merges the cooling function with the regeneration process by using the same thermal system to both regenerate the sorbent and pre-cool it. This integrated approach reduces overall energy consumption while maintaining both CO2 separation and adsorption efficiencies.
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 improves energy efficiency in CO2 capturing while minimizing thermal contamination, reducing the need for external energy and lowering the thermal impact on aquatic environments.
Implementation Method 1
a heat transfer medium may be circulated inside the jackets in a closed loop state. The heat transfer medium may be liquefied in the first heat exchange jacket while being vaporized in the second heat exchange jacket.
Data Source
AI summary
Disclosed is a dry CO2 capturing device with improved energy efficiency, which utilizes a difference in temperature between a regeneration operation of isolating CO2 from an sorbent containing CO2 absorbed therein and a pre-treatment operation of allowing H2O to be adsorbed to CO2. The dry carbon dioxide (CO2) capturing device, includes a recovery reactor for recovering CO2, a recovery cyclone for discharging a gas while separating the CO2-captured solid sorbent only, a regenerator for receiving the CO2-captured solid sorbent and separating CO2 captured in the solid sorbent, and a pre-treatment reactor for cooling the solid sorbent free from CO2, wherein a first heat exchanger is provided between the recovery cyclone and the regenerator to pass the CO2-captured solid sorbent therethrough, and a second heat exchanger is provided between the pre-treatment reactor and the regenerator to pass the solid sorbent free from CO2 therethrough. The first and second heat exchanger include a first and second heat exchange jacket mounted thereon which are connected to each other in a closed loop state.