Cyclic experiment device for adsorbing and desorbing CO2 by calcium-based adsorbent

Abstract

The invention provides a calcium-based adsorbent adsorption and desorption circulation experiment device, and belongs to the field of boiler environmental protection and atmospheric environmental protection, the calcium-based adsorbent adsorption and desorption circulation experiment device comprises a quartz glass tube, the quartz glass tube is provided with an adsorption reaction zone and a desorption reaction zone along the axial direction, and the outer sides of the adsorption reaction zone and the desorption reaction zone are respectively provided with a heating mechanism. An adsorbent is arranged in the quartz glass tube, and one end of the quartz glass tube is provided with a driving mechanism used for enabling the adsorbent to reciprocate in the adsorption reaction area and the desorption reaction area. The circulating experiment device avoids long heating and cooling waiting time, effectively inhibits pore structure collapse and activity reduction of the adsorbent caused by a thermal sintering effect, avoids performance degradation of the adsorbent caused by repeated heating and cooling and high-temperature retention, ensures the accuracy of the experiment, and improves the experiment efficiency. The experiment efficiency is obviously improved; and the energy consumption of the device is greatly reduced.

Description

Technical Field

[0001] This invention relates to the fields of boiler environmental protection and atmospheric environmental protection, specifically to a calcium-based adsorbent for adsorption and desorption. Cyclic experimental setup. Background Technology

[0002] Against the backdrop of a deep decarbonization transformation of the power system, the demand for installing carbon capture, utilization, and storage (CCUS) equipment in thermal power units is rapidly increasing in order to achieve the goal of significantly reducing carbon dioxide emissions per unit of electricity generated by existing coal-fired power plants. Solid adsorption is listed as one of the key promotion routes. Solid adsorption has advantages such as high adsorption selectivity, low energy consumption, environmental friendliness, and multiple regeneration cycles. Among these, calcium-based adsorbents have attracted much attention due to their abundant raw materials, low price, and large adsorption capacity.

[0003] However, in the laboratory research and engineering verification stages, traditional calcium-based adsorbent cycle performance testing devices suffer from significant efficiency bottlenecks and high-temperature thermal sintering interference. Conventional single-temperature zone fixed-bed reactors require repeated heating and cooling operations within the same reaction space during adsorption-desorption cycle testing: the adsorption stage needs to be maintained at approximately 600℃ to simulate the flue gas environment and achieve… High-efficiency capture is required, while the desorption stage necessitates raising the system temperature to over 900°C to achieve this. The process involves complete decomposition. The following key issues exist in this process: 1. The excessively long cycle time results in low experimental efficiency. Before each desorption, the reaction zone needs to be heated from 600℃ to 900℃, which takes about 30 minutes; after desorption, it needs to be cooled back to 600℃ for the next adsorption cycle, a cooling process that takes up to 1 hour. This severely limits the number of cycles per unit time, especially when conducting multi-cycle stability tests (such as more than 100 cycles).

[0004] 2. Accumulated residence time and performance distortion of adsorbents under high-temperature conditions. Repeated heating and cooling cause the adsorbent to be in a non-isothermal variable temperature environment for a long time, especially in the high-temperature range (>800°C), which prolongs the residence time, exacerbates CaO grain sintering and pore structure collapse, and causes cycle activity decay. This makes it difficult for experimental results to truly reflect the performance of the material under actual continuous operating conditions, affecting the accuracy of evaluation.

[0005] 3. High energy consumption and operating costs. Frequent heating and cooling lead to a large amount of wasted heat energy, which not only increases experimental costs but also poses challenges to the selection of reactor materials and the design of thermal control systems.

[0006] To overcome the aforementioned problems, researchers have recently attempted to employ methods such as parallel switching of multiple reactors, moving beds, or external adsorbent circulation. However, these methods still face limitations such as system complexity, difficulty in ensuring airtightness, severe particle wear, or high equipment costs. Therefore, we propose a calcium-based adsorbent adsorption-desorption method. Cyclic experimental setup. Summary of the Invention

[0007] The purpose of this invention is to provide a calcium-based adsorbent for adsorption and desorption. A cyclic experimental setup is provided to address the problems mentioned in the background section.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a calcium-based adsorbent for adsorption and desorption. A cyclic experimental apparatus includes a quartz glass tube, which has an adsorption reaction zone and a desorption reaction zone along the axial direction. A heating mechanism is provided on the outside of both the adsorption reaction zone and the desorption reaction zone. An adsorbent is provided inside the quartz glass tube. One end of the quartz glass tube is provided with a driving mechanism for reciprocating the adsorbent between the adsorption reaction zone and the desorption reaction zone. Furthermore, a heat insulation layer is provided between the adsorption reaction zone and the desorption reaction zone, and a heat insulation layer is provided at the end of the adsorption reaction zone away from the desorption reaction zone, and a heat insulation layer is provided at the end of the desorption reaction zone away from the adsorption reaction zone.

[0009] Furthermore, the heating mechanism is a resistance wire, which is disposed outside the adsorption reaction zone and the desorption reaction zone.

[0010] Furthermore, the temperature of the adsorption reaction zone is set to 600-650℃, and the temperature of the desorption reaction zone is set to 900-950℃.

[0011] Furthermore, the quartz glass tube is slidably connected to the adsorption reaction zone and the desorption reaction zone, and the adsorbent is fixedly disposed inside the quartz glass tube.

[0012] Furthermore, the driving mechanism includes a linear stepper motor, the output end of which is fixedly connected to a lifting screw, and the end of the lifting screw away from the linear stepper motor is fixedly connected to one end of the quartz glass tube.

[0013] Furthermore, both ends of the adsorption reaction zone and both ends of the desorption reaction zone are provided with heat insulation layers.

[0014] Furthermore, the quartz glass tube is fixedly connected to the adsorption reaction zone and the desorption reaction zone.

[0015] Furthermore, the driving mechanism includes a drive motor, the output end of which is fixedly connected to a screw, and the end of the screw away from the drive motor is threadedly connected to a nut. The nut is fixedly connected to an arc-shaped glass, and the adsorbent is placed at the end of the arc-shaped glass away from the nut.

[0016] Furthermore, a carrier boat is fixedly installed at the end of the curved glass away from the nut, and the adsorbent is placed in the carrier boat.

[0017] Compared with the prior art, the present invention has the following technical effects: 1. In this invention, the cyclic experimental device sets up an adsorption reaction zone and a desorption reaction zone on a quartz glass tube, and uses a driving mechanism to make the adsorbent reciprocate between the adsorption reaction zone and the desorption reaction zone. Compared with the traditional single-temperature zone test device, this device no longer completes the adsorption / desorption switching process by repeatedly heating and cooling. Instead, through the dual-temperature zone and driving mechanism design, it realizes the rapid and precise displacement of the adsorbent in the adsorption reaction zone and the desorption reaction zone. The physical displacement avoids the long heating and cooling waiting time.

[0018] 2. In this invention, the adsorbent switches between the adsorption and desorption reaction zones through physical movement, rather than changing the temperature of the reaction zones. During the adsorption phase, the adsorbent is in the adsorption reaction zone, maintaining a stable temperature environment. During the desorption phase, it rapidly enters the desorption reaction zone and stays there briefly before immediately returning to the adsorption reaction zone. This process significantly shortens the total residence time of the adsorbent at temperatures ≥800℃, effectively suppressing the collapse of the pore structure and the decrease in activity caused by thermal sintering. It also avoids performance degradation caused by repeated heating and cooling and high-temperature residence, ensuring the accuracy of the experiment.

[0019] 3. In this invention, the heating and cooling times, which account for a significant portion of traditional experimental setups in cyclic testing, are eliminated. The cycle time for each test is reduced from several hours to tens of minutes, allowing for several times or even tens of times more cyclic experiments to be completed within the same timeframe, significantly improving experimental efficiency. Furthermore, since the adsorption and desorption reaction zones operate independently, the enormous heating and cooling power consumption caused by frequent temperature changes is avoided, resulting in a substantial reduction in overall energy consumption and energy-saving benefits. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the cyclic experimental apparatus of Embodiment 1 of the present invention in the desorption state; Figure 2 This is a schematic diagram of the cyclic experimental apparatus of Embodiment 1 of the present invention in the adsorption state; Figure 3 This is a schematic diagram of the cyclic experimental apparatus of Embodiment 2 of the present invention in the adsorption state; Figure 4 This is a schematic diagram of the cyclic experimental apparatus of Embodiment 2 of the present invention in the desorption state; Figure 5 This is a schematic diagram of the connection between the boat and the curved glass in Embodiment 2 of the present invention.

[0021] In the diagram: 1. Quartz glass tube, 2. Adsorption reaction zone, 3. Desorption reaction zone, 4. Insulation layer, 5. Sand core, 6. Linear stepper motor, 7. Lifting screw, 8. Drive motor, 9. Screw, 10. Nut, 11. Curved glass, 12. Boat. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present invention.

[0023] In this article, terms such as "left," "right," "up," "down," "front," and "back" are established based on the positional relationships shown in the attached drawings. Depending on the attached drawings, the corresponding positional relationships may also change. Therefore, they should not be interpreted as an absolute limitation on the scope of protection.

[0024] Example 1 Please see Figures 1 to 2 This embodiment provides a calcium-based adsorbent for adsorption and desorption. The cyclic experimental apparatus includes a quartz glass tube 1, which has an adsorption reaction zone 2 and a desorption reaction zone 3 along its axial direction. The adsorption reaction zone 2 is used for the adsorption reaction (CaO+) to occur. → Desorption reaction zone 3 is used for the desorption reaction ( →CaO+ The temperature of adsorption reaction zone 2 is set to 600-650℃, and the temperature of desorption reaction zone 3 is set to 900-950℃. Heating mechanisms, which are resistance wires, are installed on the outside of both adsorption reaction zone 2 and desorption reaction zone 3 to maintain their temperatures.

[0025] Specifically, a heat insulation layer 4 is provided between the adsorption reaction zone 2 and the desorption reaction zone 3. The end of the adsorption reaction zone 2 away from the desorption reaction zone 3 is provided with the heat insulation layer 4, and the end of the desorption reaction zone 3 away from the adsorption reaction zone 2 is also provided with the heat insulation layer 4. The heat insulation layer 4 is used to prevent heat loss from the adsorption reaction zone 2 and the desorption reaction zone 3, and to ensure the temperature stability of the adsorption reaction zone 2 and the desorption reaction zone 3.

[0026] Specifically, a sand core 5 is fixedly installed inside the quartz glass tube 1. The sand core 5 is used to carry the adsorbent, which is fixed inside the quartz glass tube 1 through the sand core 5. The adsorbent is a calcium-based adsorbent. The quartz glass tube 1 is slidably connected to the adsorption reaction zone 2 and the desorption reaction zone 3, and the quartz glass tube 1 can slide along the adsorption reaction zone 2 and the desorption reaction zone 3.

[0027] Specifically, one end of the quartz glass tube 1 is equipped with a driving mechanism, which is used to reciprocate the adsorbent between the adsorption reaction zone 2 and the desorption reaction zone 3. The driving mechanism includes a linear stepper motor 6, and a lifting screw 7 is fixedly connected to the output end of the linear stepper motor 6. The end of the lifting screw 7 away from the linear stepper motor 6 is fixedly connected to one end of the quartz glass tube 1. During operation, the linear stepper motor 6 can drive the lifting screw 7 to move linearly, and the lifting screw 7 drives the quartz glass tube 1 to slide along the adsorption reaction zone 2 and the desorption reaction zone 3, so that the adsorbent in the quartz glass tube 1 reciprocates between the adsorption reaction zone 2 and the desorption reaction zone 3.

[0028] Specifically, the working principle of the cyclic experimental device proposed in Example 1 is as follows: when the adsorbent needs to adsorb the flue gas... At the same time, the linear stepper motor 6 can drive the lifting screw 7 to move linearly. The lifting screw 7 drives the quartz glass tube 1 to slide along the adsorption reaction zone 2 and the desorption reaction zone 3, so that the adsorbent is placed in the adsorption reaction zone 2. The end of the quartz glass tube 1 connected to the lifting screw 7 has a flue gas inlet. The flue gas enters the quartz glass tube 1 through the flue gas inlet and flows to the adsorption reaction zone 2, where the adsorbent undergoes an adsorption reaction. When the adsorbent is saturated and a desorption reaction is required, the linear stepper motor 6 can drive the lifting screw 7 to move linearly. The lifting screw 7 drives the quartz glass tube 1 to slide along the adsorption reaction zone 2 and the desorption reaction zone 3, so that the adsorbent is placed in the desorption reaction zone 3, where the adsorbent undergoes an adsorption reaction, producing... The adsorbent flows out from the end of the quartz glass tube 1 away from the lifting screw 7. After the adsorbent desorption is completed, the next adsorption step begins, and the linear stepper motor 6 places the adsorbent in the adsorption reaction zone 2 for the next adsorption reaction.

[0029] Specifically, this cyclic experimental device sets up an adsorption reaction zone 2 and a desorption reaction zone 3 on a quartz glass tube 1, and uses a driving mechanism to make the adsorbent reciprocate between the adsorption reaction zone 2 and the desorption reaction zone 3. Compared with the traditional single-temperature zone test device, this device no longer completes the adsorption / desorption switching process by repeatedly heating and cooling. Instead, through the dual-temperature zone and driving mechanism design, it realizes the rapid and precise displacement of the adsorbent between the adsorption reaction zone 2 and the desorption reaction zone 3. The physical displacement avoids the long heating and cooling waiting time.

[0030] Specifically, the adsorbent switches between the adsorption reaction zone 2 and the desorption reaction zone 3 by physical movement, rather than changing the temperature of the reaction zones. During the adsorption stage, the adsorbent is in the adsorption reaction zone 2, which is always in a stable temperature environment. During the desorption stage, it quickly enters the desorption reaction zone 3 and stays there briefly before immediately returning to the adsorption reaction zone 2. This process significantly shortens the total residence time of the adsorbent at temperatures ≥800℃, effectively suppressing the collapse of the pore structure and the decrease in activity caused by thermal sintering. It also avoids the performance degradation caused by repeated heating and cooling and high-temperature residence, ensuring the accuracy of the experiment.

[0031] Specifically, this device eliminates the significant heating and cooling times required in traditional experimental setups for cyclic testing, reducing the cycle time from several hours to tens of minutes. This allows for several times, even tens of times, more cyclic experiments to be completed within the same timeframe, significantly improving experimental efficiency. Furthermore, because the adsorption reaction zone 2 and desorption reaction zone 3 operate independently, the enormous heating and cooling power consumption caused by frequent temperature changes is avoided, resulting in a substantial reduction in overall energy consumption and energy-saving benefits.

[0032] Example 2 Please see Figures 3 to 5 This embodiment provides a calcium-based adsorbent for adsorption and desorption. The cyclic experimental apparatus includes a quartz glass tube 1, which has an adsorption reaction zone 2 and a desorption reaction zone 3 along its axial direction. The adsorption reaction zone 2 is used for the adsorption reaction (CaO+) to occur. → Desorption reaction zone 3 is used for the desorption reaction ( →CaO+ The temperature of adsorption reaction zone 2 is set to 600-650℃, and the temperature of desorption reaction zone 3 is set to 900-950℃. Heating mechanisms, which are resistance wires, are installed on the outside of both adsorption reaction zone 2 and desorption reaction zone 3 to maintain their temperatures.

[0033] Specifically, heat insulation layers 4 are provided at both ends of the adsorption reaction zone 2 and the desorption reaction zone 3. The heat insulation layers 4 are used to prevent heat loss from the adsorption reaction zone 2 and the desorption reaction zone 3, and to ensure the temperature stability of the adsorption reaction zone 2 and the desorption reaction zone 3.

[0034] Specifically, the quartz glass tube 1 is fixedly connected to the adsorption reaction zone 2 and the desorption reaction zone 3, and the quartz glass tube 1 cannot move. One end of the quartz glass tube 1 is equipped with a driving mechanism, which is used to reciprocate the adsorbent between the adsorption reaction zone 2 and the desorption reaction zone 3. The driving mechanism includes a drive motor 8, with a screw 9 fixedly connected to the output end of the drive motor 8. A nut 10 is threadedly connected to the end of the screw 9 away from the drive motor 8, and an arc-shaped glass 11 is fixedly connected to the nut 10. The adsorbent is placed at the end of the arc-shaped glass 11 away from the nut 10. A carrier boat 12 is fixedly installed at the end of the arc-shaped glass 11 away from the nut 10, and the adsorbent, which is a calcium-based adsorbent, is placed in the carrier boat 12. During operation, the drive motor 8 drives the screw 9 to rotate, and the rotation of the screw 9 causes the nut 10 to move on the screw 9. The nut 10 then moves the arc-shaped glass 11, thereby causing the adsorbent in the carrier boat 12 to reciprocate between the adsorption reaction zone 2 and the desorption reaction zone 3.

[0035] Specifically, the working principle of the cyclic experimental device proposed in Embodiment 2 is as follows: when the adsorbent needs to adsorb the flue gas... At this time, the drive motor 8 drives the screw 9 to rotate. The rotation of the screw 9 causes the nut 10 to move on the screw 9. The nut 10 moves the curved glass 11, placing the adsorbent in the adsorption reaction zone 2. The flue gas flows into the quartz glass tube 1 from the end away from the nut 10. When it flows into the adsorption reaction zone 2, the adsorbent undergoes an adsorption reaction. When the adsorbent is saturated and a desorption reaction is required, the drive motor 8 places the adsorbent in the desorption reaction zone 3. At this time, the adsorbent undergoes an adsorption reaction, producing... It flows out from the end of the quartz glass tube 1 near the nut 10. After the adsorbent desorption is completed, the next adsorption step begins, and the drive motor 8 places the adsorbent in the adsorption reaction zone 2 for the next adsorption reaction.

[0036] Specifically, the cyclic experimental apparatus provided in Example 2 achieves the same effect as in Example 1, and will not be described in detail here.

[0037] The above embodiments merely illustrate the basic principles and characteristics of the present invention, but are not limited to the above implementation schemes. It should be understood that those skilled in the art can make various changes and modifications to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined freely by the appended claims and their equivalents.

Claims

1. Adsorption and desorption of a calcium-based adsorbent The cyclic experimental apparatus is characterized in that, The device includes a quartz glass tube (1), which has an adsorption reaction zone (2) and a desorption reaction zone (3) along the axial direction. A heating mechanism is provided on the outside of both the adsorption reaction zone (2) and the desorption reaction zone (3). An adsorbent is provided inside the quartz glass tube (1). One end of the quartz glass tube (1) is provided with a driving mechanism for reciprocating the adsorbent between the adsorption reaction zone (2) and the desorption reaction zone (3).

2. Adsorption and desorption of the calcium-based adsorbent according to claim 1 The cyclic experimental apparatus is characterized in that, A heat insulation layer (4) is provided between the adsorption reaction zone (2) and the desorption reaction zone (3). A heat insulation layer (4) is provided at the end of the adsorption reaction zone (2) away from the desorption reaction zone (3). A heat insulation layer (4) is provided at the end of the desorption reaction zone (3) away from the adsorption reaction zone (2).

3. Adsorption and desorption of the calcium-based adsorbent according to claim 1 The cyclic experimental apparatus is characterized in that, The heating mechanism is a resistance wire, which is disposed outside the adsorption reaction zone (2) and the desorption reaction zone (3).

4. Adsorption and desorption of the calcium-based adsorbent according to claim 1 The cyclic experimental apparatus is characterized in that, The temperature of the adsorption reaction zone (2) is set to 600-650℃, and the temperature of the desorption reaction zone (3) is set to 900-950℃.

5. The calcium-based adsorbent adsorption-desorption according to claim 1 The cyclic experimental apparatus is characterized in that, The quartz glass tube (1) is slidably connected to the adsorption reaction zone (2) and the desorption reaction zone (3), and the adsorbent is fixedly disposed inside the quartz glass tube (1).

6. The calcium-based adsorbent adsorption and desorption according to claim 5 The cyclic experimental apparatus is characterized in that, The driving mechanism includes a linear stepper motor (6), and a lifting screw (7) is fixedly connected to the output end of the linear stepper motor (6). The end of the lifting screw (7) away from the linear stepper motor (6) is fixedly connected to one end of the quartz glass tube (1).

7. Adsorption and desorption of the calcium-based adsorbent according to claim 1 The cyclic experimental apparatus is characterized in that, The adsorption reaction zone (2) is provided with heat insulation layer (4) at both ends, and the desorption reaction zone (3) is provided with heat insulation layer (4) at both ends.

8. The calcium-based adsorbent adsorption-desorption according to claim 1 The cyclic experimental apparatus is characterized in that, The quartz glass tube (1) is fixedly connected to the adsorption reaction zone (2) and the desorption reaction zone (3).

9. The calcium-based adsorbent adsorption-desorption according to claim 8 The cyclic experimental apparatus is characterized in that, The driving mechanism includes a drive motor (8), the output end of which is fixedly connected to a screw (9), and the end of the screw (9) away from the drive motor (8) is threadedly connected to a nut (10). The nut (10) is fixedly connected to an arc-shaped glass (11), and the adsorbent is placed at the end of the arc-shaped glass (11) away from the nut (10).

10. The calcium-based adsorbent adsorption-desorption according to claim 9 The cyclic experimental apparatus is characterized in that, The curved glass (11) is fixedly mounted with a boat (12) at the end away from the nut (10), and the adsorbent is placed in the boat (12).

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