Rotary Heat Exchanger Calciner for CO2 Separation
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Solution Overview
Problem
Existing calcining devices for separating carbon dioxide from solid materials are not efficient and require significant space, limiting their effectiveness and scalability in carbon dioxide capture processes.
Innovation Solution
A calcining device with a separation channel and two heat exchanger units mounted rotatably around a common axis, where the first solid containing carbon dioxide is heated by a second solid flowing through parallel heating channels, allowing for efficient carbon dioxide release and separation without the need for additional conveying media, and featuring adjustable heat exchanger surfaces for optimized heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional calcining devices are used to separate carbon dioxide from solid materials, then carbon dioxide separation can be achieved, but the devices require significant space and have low efficiency
Solution Approach 1:
The calcining device is segmented into multiple heating channels (first heating channel and second heating channel) that are arranged in parallel, allowing simultaneous processing of multiple streams of second solid material. This segmentation increases the overall heat transfer surface area and separation efficiency without requiring a proportional increase in device footprint, as the channels are compactly arranged within the housing.
Solution Approach 2:
The heat exchanger surfaces are nested within the heating channels, with the first heat exchanger surface extending partially in the first heating channel and partially in a section of the separating channel. This nested arrangement allows the heat transfer surfaces to be efficiently packed within the available space, maximizing the heat transfer area while minimizing the overall device volume.
2Temperature
If high-temperature heat exchangers are used for calcination, then carbon dioxide can be expelled from limestone, but the device complexity and space requirements increase
Solution Approach 1:
The heating channels and separation channel are merged into a single integrated housing structure, with the heat exchanger surfaces serving dual purposes: heating the second solid in the heating channels and facilitating carbon dioxide separation in the separation channel. This merging eliminates the need for separate, complex high-temperature heat exchanger constructions, reducing device complexity while maintaining the required calcination temperature.
Solution Approach 2:
The heat exchanger surfaces serve multiple functions: they act as heating surfaces for the second solid in the heating channels and as separation surfaces in the separation channel. This multi-functionality reduces the overall number of components and simplifies the device construction, as the same structural elements perform multiple roles in the calcination process.
3Speed
If additional conveying media are used for solid transport, then material movement can be achieved, but energy consumption and device complexity increase
Solution Approach 1:
The first solid material is transported through the separation channel under the influence of gravity alone, without requiring additional conveying media or energy input. The separating channel is configured to allow the solid material to move freely from the inlet to the outlet, utilizing its own weight for transport. This self-service approach eliminates the need for external conveyance systems, reducing both energy consumption and device complexity.
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 device achieves high efficiency in separating carbon dioxide from the first solid with a compact design, reducing energy consumption and space requirements while maintaining high purity of the separated CO2, enabling its temporary or permanent storage for further use.
Implementation Method 1
The heat of the heat exchanger surfaces is at least partially transferred to the first solid. The first solid is heated in the separation channel, which releases the carbon dioxide.
Implementation Method 2
The carbon dioxide contained in a flue gas can be separated from the flue gas in a carbonator via the first solid and can be adsorbed by the first solid.
Implementation Method 3
The two heat exchanger units are each rotatably mounted, it being possible for the rotational mounting to take place around a common axis of rotation. The heat exchanger surfaces of the two heat exchanger units can preferably be rotated about the respective axis of rotation independently of one another.
Data Source
AI summary
The invention relates to a calcination device (24) for separating carbon dioxide from a pourable first solid (F1). The calcination device (24) has a housing (40) with a separating channel (42). A first heating channel (46) and a second heating channel (47) are provided separate from the separating channel (42). A first heat exchanger unit (34) is associated with the first heating channel (46) and the separating channel (42), and a second heat exchanger unit (35) is associated with the second heating channel (47) and the separating channel (42). The two heat exchanger units (34), (35) each extend, with a heat dissipation section (62a, 71a) on their heat exchanger surfaces (62, 71), into the separating channel (42), while a heat absorption section (62b, 71b) extends into the respective heating channel (46, 47) associated therewith. The two heat exchanger surfaces (62, 71) are rotatably arranged around a preferably common rotational axis (D) via a respectively associated rotary drive (64, 70). In the separating channel (42), the carbon dioxide-containing first solid (F1) is heated up, and the adsorbed carbon dioxide is thereby released. Said carbon dioxide is discharged out of the housing (40) of the calcination device (24) via at least one gas discharge channel (36, 37). The calcination device (24) can be part of a device for separating carbon dioxide from a flue gas, wherein the first solid (F1) is first brought into contact with the flue gas, and the carbon dioxide is adsorbed and then released again in the calcination device (24).