Energy-saving fast rich amine liquid regeneration coupling reactor

Abstract

The application discloses an energy-saving and rapid rich amine liquid regeneration coupling reactor, a multi-stage hole electric heating catalyst and a power connection port are connected with an external power supply, power is supplied to heat and warm up, rich amine liquid is added through a rich amine liquid inlet, and enters an amine liquid regeneration cavity through a foam rectifier, the rich amine liquid is heated and regenerated on the multi-stage hole electric heating catalyst, CO2 gas is generated to volatilize a small amount of amine liquid steam and water vapor, passes through a dragon tooth gas outlet, the CO2 gas completely passes through, and most of the amine liquid steam and water vapor are condensed and fall back to the amine liquid regeneration cavity below, continue to purify the CO2 gas on a baffle, completely isolate the volatilized amine liquid and water, the purified CO2 gas flows to a cold gas outlet through a hot gas outlet and a first heat exchange cavity, the outflow of the cold gas outlet is as small as 10 mL / min, the amine liquid regeneration is completed, and the regenerated amine liquid is discharged through a lean amine liquid outlet. The reactor has the advantages of fast warming, easy separation, small volume, short regeneration time and the like, and can significantly improve the regeneration efficiency of the rich CO2 amine liquid.

Description

Technical Field

[0001] This invention belongs to the field of reactor technology, and in particular, relates to an energy-saving, rapid amine-rich liquid regeneration coupled reactor. Background Technology

[0002] Carbon dioxide is a major cause of global warming and climate change, and has been proven to be one of the most important issues in the world.

[0003] CO2 emissions exist in the vast majority of industries, so drastic equipment transformation is obviously impractical. Therefore, CO2 back-end capture is the preferred method. Among all capture technologies, using amine solvents to absorb and capture CO2 is the most applicable and effective method.

[0004] Although amine-based post-combustion CO2 capture technology is the most promising technology, it also has some drawbacks, such as large equipment size, high energy requirements for CO2-loaded solvent regeneration, and rapid amine degradation. A large amount of energy is required for CO2 desorption during solvation. To reduce energy loss, three main approaches are currently used: First, developing new solvents and using mixed amines to optimize the reaction rate between CO2 and the amine solvent, reducing water usage, decreasing the latent heat of water evaporation, and reducing the energy required for amine regeneration. However, due to the complexity of the components, consistency is poor, and the amine solution circulation performance deteriorates, making effective separation of multiple components impossible. Second, adding a catalyst during amine regeneration lowers the regeneration temperature to below 100°C. However, this presents separation difficulties and only increases the regeneration rate of the first 50% of the amine solution adsorbed. Complete desorption still requires raising the temperature to higher levels, failing to fundamentally solve the regeneration problem. Thirdly, there are enzymes and catalytic CO2 capture, such as carbonic anhydrase, which appears to be a good solvent with low regeneration energy requirements, increasing reaction rates and reducing the size of the absorption tower. However, the limited lifespan of enzymes and the loss of activity due to below-optimal pH or temperature have proven to be major challenges for their commercial application. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides an energy-saving and rapid amine-rich liquid regeneration coupled reactor, which solves the problems of high energy consumption and low efficiency in the traditional CO2 regeneration process. By enhancing heat and mass transfer methods, the regeneration rate is improved, the regeneration energy consumption is reduced, and the waste heat is used for preheating, realizing multi-stage coordination of calorific value and improving the regeneration efficiency of the entire regeneration coupled reactor.

[0006] To achieve the above technical objectives, the present invention adopts the following technical solution: an energy-saving rapid amine-rich liquid regeneration coupling reactor, comprising: a base, a foam rectifier, a reactor shell, a heat exchange wall, a reactor inner wall, a multi-stage porous electrically heated catalyst, a toothed gas outlet, a baffle, an amine-rich liquid inlet, a power connection port, a hot gas outlet, a mist eliminator, a lean amine liquid outlet, and a cold gas outlet.

[0007] The base and power connection port are fixed to the bottom of the reactor shell. The lower opening of the reactor shell is fixedly connected to the cold gas outlet. A heat exchange wall is provided inside the reactor shell, and a hot gas outlet is provided at the top of the heat exchange wall. The hot gas outlet is fixedly connected to the mist eliminator. A through-hole rich amine liquid inlet is provided at the upper end of the side wall of the reactor shell and the heat exchange wall. An inner reactor wall is provided inside the heat exchange wall. The foam rectifier is nested at the bottom inner side of the inner reactor wall. A toothed gas outlet is welded on the inner reactor wall. The cavity formed by the inner reactor wall, the foam rectifier, and the toothed gas outlet is the amine liquid regeneration chamber. A multi-stage porous electrically heated catalyst is provided in the amine liquid regeneration chamber. The extended wire of the multi-stage porous electrically heated catalyst passes through the foam rectifier and is connected to the power connection port. The power connection port is connected to an external power source. Crossed baffles are welded and fixed on the inner reactor wall above the toothed gas outlet. A through-hole lean amine liquid outlet is provided at the lower end of the side wall of the reactor wall, the heat exchange wall, and the reactor shell.

[0008] Furthermore, the reactor shell and the heat exchange wall are fixedly connected by welding with support rods, forming a first heat exchange cavity between the reactor shell and the heat exchange wall, and forming a second heat exchange cavity between the heat exchange wall and the inner wall of the reactor.

[0009] Furthermore, the multi-level porous electrothermal catalyst is composed of a high-resistivity conductive substrate and a multi-level porous catalyst layer corroded on the surface of the high-resistivity conductive substrate; the resistance of the high-resistivity conductive substrate at 20°C is 0.8–2.5 μΩ·m.

[0010] Furthermore, the preparation process of the hierarchical porous electrothermal catalyst is as follows:

[0011] Step 1: Place the high-resistivity conductive substrate in an oxidation solution, control the voltage to be 1-30V, the current to be 1-15A, the stirring speed to be 1-300 rpm, and the oxidation time to be 1-600 min. Then rinse with water for 1-120 min, dry at 30-180℃, and then calcine at 1-15℃ / min to 200-1000℃ for 1-10 h to obtain the calcined substrate.

[0012] Step 2: Completely immerse the calcined matrix in a solution of active component with a mass fraction of 1-30%, then add ethylenediamine at a rate of 1-10 mL / min until the pH value reaches 7-13. Then rinse with water for 1-120 min, dry at 30-180℃, and calcine at 200-600℃ for 1-10 h under a nitrogen atmosphere with a heating rate of 1-15℃ / min to obtain a hierarchical porous electrothermal catalyst.

[0013] Further, the components of the oxidizing liquid include, by mass fraction: 5-35% oxalic acid, 1-12% citric acid, 1-5% acetic acid, and 48-93% water; the oxalic acid, citric acid, acetic acid, and water are mixed evenly and left to stand for 5-360 minutes.

[0014] Furthermore, the active component solution is one or more of the following: nitrates, chlorates, and sulfates of Cu, Ag, Fe, Pt, Pd, Ce, Rh, and Ni, mixed in any proportion.

[0015] Furthermore, the high-resistivity conductive substrate has one of the following shapes: spiral, straight, U-shaped, or randomly stacked.

[0016] Furthermore, the material of the high-resistance conductive substrate is one of NiCr alloy, FeCrAl alloy, Al alloy, and Ni alloy.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The multi-level porous electrothermal catalyst of the present invention is anolyzed by composite oxidizing liquid and regenerated at high temperature to etch nano-micro-nano multi-level pores on the surface of high-resistivity conductive substrate, which enhances the transport characteristics and heat transfer process in CO2 desorption: the multi-level pores on the surface of high-resistivity conductive substrate maintain strong capillary pressure, which allows a large number of tiny bubbles generated on the surface of high-resistivity conductive substrate to quickly detach from the high-resistivity conductive substrate, thereby improving heat transfer performance and enhancing the CO2 desorption process; at the same time, the high-resistivity conductive substrate itself can be used as a heat energy source. Compared with traditional external electric heating, it can quickly transfer heat to amine liquid without transfer limitations and thermal resistance, reducing the heat energy waste caused by heat dissipation and insufficient transfer, and greatly improving the thermal efficiency of the rich amine liquid regeneration coupling reactor; and due to internal self-heating, the multi-level porous electrothermal catalyst has a fast heating rate and no external heat preservation structure, which allows the volume of the rich amine liquid regeneration coupling reactor to be greatly reduced. The amine-rich liquid regeneration coupled reactor of this invention combines heating and regeneration, which speeds up the entire desorption process, saves amine regeneration time, and the multi-level porous catalyst layer and high-resistance conductive substrate are integrally formed, eliminating the problem of shedding and improving the amine regeneration cycle characteristics.

[0019] (2) This invention employs a coupled heat exchange design to recover the waste heat of the high-temperature gas after the reaction for preheating the amine-rich liquid, significantly improving the overall thermal efficiency of the reactor. The designed tooth-shaped gas outlet is small and tilted upwards, which increases the reactor pressure, lowers the boiling point, and raises the internal steam temperature, further enhancing the CO2 desorption rate. The designed baffle reduces the amount of liquid entrained by the gas, improving the recycling performance of the amine liquid.

[0020] Compared to traditional amine regeneration reactors, this invention's energy-saving, rapid amine-rich liquid regeneration coupled reactor offers advantages such as faster desorption speed, higher heat transfer efficiency, higher energy utilization, faster heating rate, smaller size, and shorter regeneration time. The multi-stage porous electrically heated catalyst is integrally molded, resulting in a long regeneration lifespan. The coupled heat exchange design significantly improves the overall reactor's thermal efficiency and CO2 desorption rate, eliminating liquid entrainment in the gas and enhancing the amine liquid's recycling and regeneration performance. This invention can substantially reduce CO2 regeneration costs and improve regeneration efficiency for enterprises, making it highly suitable for industrial applications under dual-carbon goals and energy-saving policies. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the energy-saving rapid amine-rich liquid regeneration coupling reactor of the present invention;

[0022] Figure 2 This is a SEM image of the surface pores of the multi-level porous electrothermal catalyst in Example 1;

[0023] Figure 3 This is a comparison of the analytical rates between the energy-saving rapid amine-rich liquid regeneration coupled reactor in Example 1 and the blank experiment;

[0024] Figure 4 This is a comparison of the relative heat load between the energy-saving rapid amine-rich liquid regeneration coupled reactor in Example 1 and the blank experiment;

[0025] Figure 5 The diagram shows the number of cycles in the energy-saving rapid amine-rich liquid regeneration coupled reactor in Example 1. Detailed Implementation

[0026] The technical solution of the present invention will be further explained and described below with reference to the accompanying drawings and embodiments.

[0027] like Figure 1 This is a schematic diagram of the structure of the energy-saving rapid amine-rich liquid regeneration coupling reactor of the present invention. The regeneration coupling reactor includes: a base 1, a foam rectifier 2, a reactor shell 3, a heat exchange wall 5, a reactor inner wall 7, a multi-stage porous electrically heated catalyst 8, a tooth-shaped gas outlet 9, a baffle 10, an amine-rich liquid inlet 11, a power connection port 12, a hot gas outlet 13, a mist eliminator 14, a lean amine liquid outlet 17, and a cold gas outlet 18.

[0028] The base 1 and power connection port 12 are welded and fixed to the lower part of the reactor shell 3. The lower part of the reactor shell 3 is open and fixedly connected to the cold gas outlet 18. A heat exchange wall 5 is provided inside the reactor shell 3. The reactor shell 3 and the heat exchange wall 5 are welded and fixedly connected by a support rod 15. A first heat exchange chamber 4 is formed between the reactor shell 3 and the heat exchange wall 5 for the recovery of waste heat from CO2 hot gas and the preheating of cold amine-rich liquid. A hot gas outlet 13 is provided at the top of the heat exchange wall 5. The hot gas outlet 13 is fixedly connected to the mist eliminator 14. The hot gas outlet 13 is used to discharge the hot CO2 gas volatilized during regeneration. The mist eliminator 14 is used to further eliminate the trace amounts of amine liquid and water remaining in the hot CO2 gas. A through-hole amine-rich liquid inlet 11 is provided at the upper end of the side wall of the reactor shell 3 and the heat exchange wall 5. In order to accelerate the addition speed of amine-rich liquid, multiple amine-rich liquid inlets 11 can be set. The interior of the heat exchange wall 5 is provided with a reactor inner wall 7. A second heat exchange chamber 6 is formed between the hot wall 5 and the inner wall 7 of the reactor, which is used to circulate cold rich amine liquid, obtain the residual heat of the first heat exchange chamber 4 and dissipate heat from the amine regeneration chamber 16, and preheat the cold rich amine liquid. The foam rectifier 2 is nested at the bottom of the inner side of the inner wall 7 of the reactor. The inner wall 7 of the reactor has a tooth-shaped gas outlet 9 welded on it. The cavity formed by the inner wall 7 of the reactor, the foam rectifier 2, and the tooth-shaped gas outlet 9 is the amine regeneration chamber 16. The amine regeneration chamber 16 is equipped with a multi-stage porous electric heating catalyst 8. The extended wire of the multi-stage porous electric heating catalyst 8 passes through the foam rectifier 2 and is connected to the power connection port 12. The power connection port 12 is connected to an external power source. The inner wall 7 of the reactor above the tooth-shaped gas outlet 9 is welded with fixed cross baffles 10 to reduce the gas entrainment of liquid and improve the circulation and regeneration performance of the amine liquid. The inner wall 7 of the reactor, the heat exchange wall 5, and the lower side wall of the reactor shell 3 are provided with a through-hole lean amine liquid outlet 17. Compared to traditional amine regeneration reactors, this invention's energy-saving and rapid amine-rich liquid regeneration coupled reactor offers advantages such as fast desorption speed, high heat transfer efficiency, high energy utilization, rapid heating rate, small size, and short regeneration time. The multi-stage porous electrically heated catalyst is integrally molded, resulting in a long regeneration lifespan. The coupled heat exchange design significantly improves the overall reactor's thermal efficiency and CO2 desorption rate, eliminating liquid entrainment in the gas and enhancing the amine liquid's recycling and regeneration performance. This invention can significantly reduce CO2 regeneration costs and improve regeneration efficiency for enterprises, making it highly suitable for industrial applications under dual-carbon goals and energy-saving policies.

[0029] The working process of the energy-saving rapid amine-rich liquid regeneration coupled reactor of the present invention is as follows: the multi-stage porous electric heating catalyst 8 and the power connection port 12 are connected to an external power source and heated by electricity. The amine-rich liquid is added through the amine-rich liquid inlet 11 and enters the amine regeneration chamber 16 through the foam rectifier 2. The amine-rich liquid is heated and regenerated on the multi-stage porous electric heating catalyst 8, generating CO2 gas that evaporates and carries away a small amount of amine vapor and water vapor. The CO2 gas passes through the dragon tooth gas outlet 9 and passes through completely. Most of the amine vapor and water vapor condense and fall back to the lower amine regeneration chamber 16. The CO2 gas continues to be purified on the baffle 10, completely isolating the evaporated amine liquid and water. The purified CO2 gas flows through the hot gas outlet 13 and the first heat exchange chamber 4 to the cold gas outlet 18. When the gas flow rate of the cold gas outlet 18 is reduced to 10 mL / min, the amine regeneration is completed. The regenerated amine liquid is discharged through the lean amine liquid outlet 17.

[0030] The hierarchical porous electrothermal catalyst 8 in this invention consists of a high-resistivity conductive substrate and a hierarchical porous catalyst layer etched onto the surface of the high-resistivity conductive substrate. The high-resistivity conductive substrate has a resistivity of 0.8–2.5 μΩ·m at 20°C. The preparation process of the hierarchical porous electrothermal catalyst 8 is as follows:

[0031] Step 1: Place the high-resistivity conductive substrate in an oxidation solution, control the voltage to be 1-30V, the current to be 1-15A, the stirring speed to be 1-300 rpm, and the oxidation time to be 1-600 min. Then rinse with water for 1-120 min, dry at 30-180℃, and then calcine at 1-15℃ / min to 200-1000℃ for 1-10 h to obtain the calcined substrate.

[0032] Step 2: Completely immerse the calcined matrix in a solution of active component with a mass fraction of 1-30%, then add ethylenediamine at a rate of 1-10 mL / min until the pH value reaches 7-13. Then rinse with water for 1-120 min, dry at 30-180℃, and calcine at 200-600℃ for 1-10 h under a nitrogen atmosphere with a heating rate of 1-15℃ / min to obtain the hierarchical porous electrothermal catalyst 8.

[0033] The oxidation solution in this invention comprises, by mass fraction: 5-35% oxalic acid, 1-12% citric acid, 1-5% acetic acid, and 48-93% water. The oxalic acid, citric acid, acetic acid, and water are mixed thoroughly and allowed to stand for 5-360 minutes. This multi-stage acid oxidation solution achieves multi-level oxidation effects, forming porous structures of different pore sizes on the substrate surface, thus enhancing the rate of bubble formation and desorption in the later stages.

[0034] In this invention, the active component solution is one or more of the following: nitrates, chlorates, and sulfates of Cu, Ag, Fe, Pt, Pd, Ce, Rh, and Ni, mixed in any proportion.

[0035] In this invention, the high-resistivity conductive substrate can be one of the following shapes: spiral, straight, U-shaped, or randomly stacked. Designing the high-resistivity substrate into different shapes can increase the internal heat transfer space and heat transfer area. The spiral shape can increase the electric heating length and increase the temperature; the straight shape can reduce the processing difficulty and improve consistency; the U-shaped structure can reduce the number of connection points and increase the lifespan; and the randomly stacked shape can improve the mass transfer efficiency and increase the internal turbulence.

[0036] The high-resistance conductive substrate in this invention is made of one of the following materials: NiCr alloy, FeCrAl alloy, Al alloy, and Ni alloy.

[0037] Example 1

[0038] This embodiment provides a preparation process for a multi-level porous electrically heated catalyst 8 as follows:

[0039] Step 1: Prepare an oxidation solution according to the following mass fractions: 35% oxalic acid, 10% citric acid, 5% acetic acid, and 50% water. Mix thoroughly and stir for 60 minutes, then let stand for 120 minutes. Process a FeCrAl alloy high-resistivity conductive substrate with a resistivity of 0.8 μΩ·m at 20℃ into a spiral shape, place it in the oxidation solution, control the voltage at 30V, the current at 15A, the stirring speed at 300 rpm, and the oxidation time at 600 minutes. Then rinse with deionized water for 100 minutes, dry at 90℃, and calcine at 600℃ for 10 hours with a temperature increase of 10℃ / min to obtain the calcined substrate. Figure 2 As shown, a large number of uniformly distributed pores, ranging from several micrometers to tens of micrometers, exist on the surface of the high-resistivity conductive substrate. Numerous needle-like nanopores are present on the pore walls, and the nanopores are uniformly distributed. Furthermore, the porosity at the substrate end is high, with strip-shaped channels distributed in a staggered manner, forming a large number of surface pores. The pores, micropores, and nanofiber structures, together with the helical structure of the substrate, form a multi-level pore system of macro-micro-nano, which can significantly improve the CO2 desorption rate.

[0040] Step 2: Prepare a Ni(NO3)2 active component solution, an aqueous solution with a mass fraction concentration of 15%, and completely immerse the calcined matrix in the active component solution. Then, add ethylenediamine at a rate of 1 mL / min until the pH value reaches 10. After that, rinse with deionized water for 120 min, dry at 90 °C, and then calcine at 600 °C for 2 h under a nitrogen atmosphere at a heating rate of 10 °C / min to obtain the calcined hierarchical porous electrothermal catalyst 8.

[0041] The obtained multi-level porous electrically heated catalyst 8 is assembled into the rich amine liquid regeneration coupling reactor of the present invention. The multi-level porous electrically heated catalyst 8 and the power connection port 12 are connected to a 36V-8A external power supply. The internal temperature of the reactor rises to 85°C within 30 seconds and is stabilized at a constant temperature. Rich amine liquid saturated with CO2 adsorption is introduced through the rich amine liquid inlet 11. The amine liquid is rapidly regenerated. When the regeneration is complete, it is discharged from the lean amine liquid outlet 17 and enters the CO2 adsorption process.

[0042] The CO2 desorption rate of the amine-rich liquid regeneration coupled reactor in this embodiment is compared with that of a conventional cylindrical reactor. Figure 3 The energy-saving rapid amine-rich liquid regeneration coupled reactor in this embodiment shows a significant improvement in the desorption rate, completing desorption in just 18 minutes, saving 67% of the regeneration time compared to traditional reactors. Figure 4 In this embodiment, the relative heat load is only 58% of the comparative example, resulting in significant energy savings. Figure 5 The diagram shows the number of cycles in the energy-saving rapid amine liquid regeneration coupled reactor in this embodiment. It can be seen that after up to 15 cycles of regeneration, the reactor's regeneration capacity did not show a significant decrease, demonstrating very stable catalytic performance.

[0043] Example 2

[0044] This embodiment provides a preparation process for a multi-level porous electrically heated catalyst 8 as follows:

[0045] Step 1: Prepare an oxidation solution according to the following mass fractions: 25% oxalic acid, 5% citric acid, 1% acetic acid, and 69% water. Mix thoroughly, stir for 5 minutes, and let stand for 5 minutes. Press a NiCr alloy high-resistance conductive substrate with a resistance of 2 μΩ·m at 20℃ into a straight line, arrange multiple lines in series, and weld the nodes. Place the substrate in the above oxidation solution, control the voltage at 2V, the current at 15A, the stirring speed at 20 rpm, and the oxidation time at 5 minutes. Then rinse with deionized water for 1 minute, dry at 30℃, and calcine at 200℃ for 2 hours at a rate of 1℃ / min to obtain the calcined substrate.

[0046] Step 2: The calcined matrix is ​​completely immersed in a 1% (w / w) Rh(NO3)3 aqueous solution, and then 10% (w / w) ammonia is added at a rate of 3 mL / min until the pH value reaches 7. After rinsing with deionized water for 1 min, it is dried at 30°C and then calcined at 200°C for 1 h under a nitrogen atmosphere at a heating rate of 1°C / min to obtain the calcined hierarchical porous electrothermal catalyst 8.

[0047] The obtained multi-level porous electrically heated catalyst 8 is assembled into the rich amine liquid regeneration coupling reactor of the present invention. The multi-level porous electrically heated catalyst 8 and the power connection port 12 are connected to a 24V-10A external power supply. The internal temperature of the reactor rises to 88°C within 20 seconds and is stabilized at a constant temperature. Rich amine liquid saturated with CO2 adsorption is introduced through the rich amine liquid inlet 11. The amine liquid is rapidly regenerated. When the regeneration is complete, it is discharged from the lean amine liquid outlet 17 and enters the CO2 adsorption process.

[0048] In this embodiment, the analysis can be completed in 15 minutes, saving 75% of the regeneration time compared to the traditional reactor. Moreover, the energy-saving rapid amine liquid regeneration coupled reactor in this embodiment has a relative heat load of only 40% of the comparative example, with obvious energy-saving effect. It can be regenerated in up to 20 cycles without significant attenuation and has very stable catalytic performance.

[0049] Example 3

[0050] This embodiment provides a preparation process for a multi-level porous electrically heated catalyst 8 as follows:

[0051] Step 1: Prepare an oxidation solution by mass fraction of 25% oxalic acid, 5% citric acid, 5% acetic acid, and 65% water. Mix thoroughly, stir for 10 minutes, and let stand for 360 minutes. Process a Ni alloy high-resistance conductive substrate with a resistivity of 2.5 μΩ·m at 20°C into a U-shape, place it in the oxidation solution, control the voltage at 10V, the current at 2A, the stirring speed at 200 rpm, and the oxidation time at 50 minutes. Then rinse with deionized water for 20 minutes, dry at 120°C, and calcine at 400°C for 2 hours at a rate of 5°C / min to obtain the calcined substrate.

[0052] Step 2: The calcined matrix was completely immersed in a 20% Fe(NO3)3 active component solution. Then, tetramethylammonium hydroxide was added at a rate of 10 mL / min until the pH value reached 7. After that, it was rinsed with deionized water for 90 min, dried at 120 °C, and then calcined at 400 °C for 2 h under a nitrogen atmosphere at a heating rate of 9 °C / min to obtain the calcined hierarchical porous electrothermal catalyst 8.

[0053] The obtained multi-level porous electrothermal catalyst 8 is assembled into the rich amine liquid regeneration coupling reactor of the present invention. The multi-level porous electrothermal catalyst 8 and the power connection port 12 are connected to an external power supply of 18V-5A. The internal temperature of the reactor rises to 86°C within 40 seconds and is stabilized. Rich amine liquid saturated with CO2 adsorption is introduced through the rich amine liquid inlet 11. The amine liquid is rapidly regenerated. When the regeneration is complete, it is discharged from the lean amine liquid outlet 17 and enters the CO2 adsorption process.

[0054] In this embodiment, the analysis can be completed in 25 minutes, saving 58% of the regeneration time compared to the traditional reactor. Moreover, the energy-saving rapid amine-rich liquid regeneration coupled reactor in this embodiment has a relative heat load of only 60% of the comparative example, with obvious energy-saving effect. It can be regenerated in up to 10 cycles without significant attenuation and has very stable catalytic performance.

[0055] Example 4

[0056] The preparation process of a multi-level porous electrically heated catalyst 8 in this embodiment is as follows:

[0057] Step 1: Prepare an oxidation solution by mass fraction of 35% oxalic acid, 12% citric acid, 5% acetic acid, and 48% water. Mix thoroughly, stir for 120 min, and let stand for 120 min. Process the Al alloy high-resistance conductive substrate with a resistance of 2.5 μΩ·m at 20℃ into a spiral shape, place it in the oxidation solution, control the voltage at 20V, the current at 10A, the stirring speed at 200 rpm, and the oxidation time at 120 min. Then rinse with deionized water for 120 min, dry at 150℃, and calcine at 600℃ for 5 h at a rate of 5℃ / min to obtain the calcined substrate.

[0058] Step 2: The calcined matrix is ​​completely immersed in a 1% (w / w) solution of Pt(NO3)2 active component. Then, ethylenediamine is added at a rate of 5 mL / min until the pH reaches 7. After rinsing with deionized water for 120 min, the matrix is ​​dried at 60 °C and then calcined at 450 °C for 2 h at a heating rate of 5 °C / min under a nitrogen atmosphere of 1000 mL / min to obtain the calcined hierarchical porous electrothermal catalyst 8.

[0059] The obtained multi-level porous electrothermal catalyst 8 is assembled into the rich amine liquid regeneration coupling reactor of the present invention. The multi-level porous electrothermal catalyst 8 and the power connection port 12 are connected to a 12V-10A external power supply. The internal temperature of the reactor rises to 85°C within 32 seconds and is stabilized. Rich amine liquid saturated with CO2 adsorption is introduced through the rich amine liquid inlet 11. The amine liquid is rapidly regenerated. When the regeneration is complete, it is discharged from the lean amine liquid outlet 17 and enters the CO2 adsorption process.

[0060] In this embodiment, the analysis can be completed in 30 minutes, saving 50% of the regeneration time compared to the traditional reactor. Moreover, the energy-saving rapid amine-rich liquid regeneration coupled reactor in this embodiment has a relative heat load of only 63% of the comparative example, with obvious energy-saving effect. It can be regenerated in up to 12 cycles without significant attenuation and has very stable catalytic performance.

[0061] Example 5

[0062] The preparation process of a multi-level porous electrically heated catalyst 8 in this embodiment is as follows:

[0063] Step 1: Prepare an oxidation solution by mass fraction of 35% oxalic acid, 1% citric acid, 1% acetic acid, and 63% water. Mix the solutions thoroughly and stir for 240 min. Let the solution stand for 5 min. Randomly stack NiCr alloy high-resistance conductive matrix wires with a resistance of 1.5 μΩ·m at 20°C and place them in the oxidation solution. Control the voltage at 1V, the current at 15A, the stirring speed at 1 rpm, and the oxidation time at 1 min. Then rinse with deionized water for 120 min, dry at 180°C, and calcine at 1000°C for 1 h at a rate of 15°C / min to obtain the calcined matrix.

[0064] Step 2: The calcined matrix is ​​completely immersed in a 30% Cu(NO3)2 active component solution. Then, potassium hydroxide is added at a rate of 5 mL / min until the pH value reaches 13. After rinsing with deionized water for 120 min, it is dried at 180℃ and then calcined at 400℃ for 10 h under a nitrogen atmosphere at a heating rate of 15℃ / min to obtain the calcined hierarchical porous electrothermal catalyst 8.

[0065] The obtained multi-level porous electrothermal catalyst 8 is assembled into the rich amine liquid regeneration coupling reactor of the present invention. The multi-level porous electrothermal catalyst 8 and the power connection port 12 are connected to a 15V-6A external power supply. The internal temperature of the reactor rises to 90°C within 50 seconds and is stabilized at a constant temperature. Rich amine liquid saturated with CO2 adsorption is introduced through the rich amine liquid inlet 11. The amine liquid is rapidly regenerated. When the regeneration is complete, it is discharged from the lean amine liquid outlet 17 and enters the CO2 adsorption process.

[0066] In this embodiment, the analysis can be completed in 35 minutes, saving 41% of the regeneration time compared to the traditional reactor. Moreover, the energy-saving rapid amine liquid regeneration coupled reactor of this embodiment has a relative heat load of only 68% of the comparative example, with obvious energy-saving effect. It has no significant attenuation after up to 8 cycles of regeneration and has very stable catalytic performance.

[0067] Example 6

[0068] The preparation process of a multi-level porous electrically heated catalyst 8 in this embodiment is as follows:

[0069] Step 1: Prepare an oxidation solution by mass fraction of 5% oxalic acid, 1% citric acid, 1% acetic acid, and 93% water. Mix thoroughly, stir for 10 minutes, and let stand for 10 minutes. Process a FeCrAl alloy high-resistance conductive substrate with a resistance of 1 μΩ·m at 20℃ into a U-shape, place it in the oxidation solution, control the voltage at 20V, the current at 1A, the stirring speed at 200 rpm, and the oxidation time at 400 minutes. Then rinse with deionized water for 80 minutes, dry at 90℃, and calcine at 500℃ for 2 hours at a rate of 8℃ / min to obtain the calcined substrate.

[0070] Step 2: The calcined matrix is ​​completely immersed in a Ce(NO3)3 active component solution with a mass fraction of 20%. Sodium hydroxide is then added at a rate of 5 mL / min until the pH value reaches 13. After rinsing with deionized water for 20 min, the matrix is ​​dried at 80 °C and then calcined at 600 °C for 10 h under a nitrogen atmosphere at a heating rate of 15 °C / min to obtain the calcined hierarchical porous electrothermal catalyst 8.

[0071] The obtained multi-level porous electrically heated catalyst 8 is assembled into the rich amine liquid regeneration coupling reactor of the present invention. The multi-level porous electrically heated catalyst 8 and the power connection port 12 are connected to a 36V-10A external power supply. The internal temperature of the reactor rises to 80°C within 20 seconds and is stabilized at a constant temperature. Rich amine liquid saturated with CO2 adsorption is introduced through the rich amine liquid inlet 11. The amine liquid is rapidly regenerated. When the regeneration is complete, it is discharged from the lean amine liquid outlet 17 and enters the CO2 adsorption process.

[0072] In this embodiment, the analysis can be completed in 13 minutes, saving 78% of the regeneration time compared to the traditional reactor. Moreover, the energy-saving rapid amine liquid regeneration coupled reactor in this embodiment has a relative heat load of only 42% of the comparative example, with obvious energy-saving effect. It can be regenerated in up to 25 cycles without significant attenuation and has very stable catalytic performance.

[0073] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. An energy-saving, rapid amine-rich liquid regeneration coupled reactor, characterized in that, include: Base (1), foam rectifier (2), reactor shell (3), heat exchange wall (5), reactor inner wall (7), multi-stage porous electric heating catalyst (8), dragon tooth gas outlet (9), baffle (10), rich amine liquid inlet (11), power connection port (12), hot gas outlet (13), mist eliminator (14), lean amine liquid outlet (17), cold gas outlet (18); The base (1) and power connection port (12) are fixed to the bottom of the reactor shell (3). The lower opening of the reactor shell (3) is fixedly connected to the cold gas outlet (18). A heat exchange wall (5) is provided inside the reactor shell (3). A hot gas outlet (13) is provided at the top of the heat exchange wall (5). The hot gas outlet (13) is fixedly connected to the mist eliminator (14). A through-hole amine liquid inlet (11) is provided at the upper end of the side wall of the reactor shell (3) and the heat exchange wall (5). A reactor inner wall (7) is provided inside the heat exchange wall (5). The foam rectifier (2) is nested at the bottom of the inner side of the reactor inner wall (7). A toothed gas outlet (9) is welded on. The cavity formed by the reactor inner wall (7), the foam rectifier (2), and the toothed gas outlet (9) is the amine regeneration chamber (16). A multi-level porous electric heating catalyst (8) is provided in the amine regeneration chamber (16). The extended wire of the multi-level porous electric heating catalyst (8) passes through the foam rectifier (2) and is connected to the power connection port (12). The power connection port (12) is connected to an external power source. A fixed cross baffle (10) is welded on the reactor inner wall (7) above the toothed gas outlet (9). The lower end of the side wall of the reactor inner wall (7), the heat exchange wall (5), and the reactor shell (3) is provided with a through-hole lean amine liquid outlet (17).

2. The energy-saving rapid amine-rich liquid regeneration coupled reactor according to claim 1, characterized in that, The reactor shell (3) and the heat exchange wall (5) are fixedly connected by welding through a support rod (15). A first heat exchange cavity (4) is formed between the reactor shell (3) and the heat exchange wall (5), and a second heat exchange cavity (6) is formed between the heat exchange wall (5) and the inner wall (7) of the reactor.

3. The energy-saving rapid amine-rich liquid regeneration coupled reactor according to claim 1, characterized in that, The multi-level porous electrically heated catalyst (8) is composed of a high-resistivity conductive substrate and a multi-level porous catalyst layer corroded on the surface of the high-resistivity conductive substrate; the resistance of the high-resistivity conductive substrate at 20°C is 0.8 to 2.5 μΩ·m.

4. The energy-saving rapid amine-rich liquid regeneration coupled reactor according to claim 3, characterized in that, The preparation process of the hierarchical porous electrically heated catalyst (8) is as follows: Step 1: Place the high-resistivity conductive substrate in an oxidation solution, control the voltage to be 1-30V, the current to be 1-15A, the stirring speed to be 1-300 rpm, and the oxidation time to be 1-600 min. Then rinse with water for 1-120 min, dry at 30-180℃, and then calcine at 1-15℃ / min to 200-1000℃ for 1-10 h to obtain the calcined substrate. Step 2: The calcined matrix is ​​completely immersed in a solution of active component with a mass fraction of 1-30%, and then ethylenediamine is added at a rate of 1-10 mL / min until the pH value reaches 7-13. Then, it is rinsed with water for 1-120 min, dried at 30-180℃, and calcined at 200-600℃ for 1-10 h under a nitrogen atmosphere with a heating rate of 1-15℃ / min to obtain a multi-level porous electrothermal catalyst (8).

5. The energy-saving rapid amine-rich liquid regeneration coupled reactor according to claim 4, characterized in that, The components of the oxidizing solution, by mass fraction, include: 5-35% oxalic acid, 1-12% citric acid, 1-5% acetic acid, and 48-93% water; the oxalic acid, citric acid, acetic acid, and water are mixed evenly and left to stand for 5-360 minutes.

6. The energy-saving rapid amine-rich liquid regeneration coupled reactor according to claim 4, characterized in that, The active component solution is one or more of the following: nitrates, chlorates, and sulfates of Cu, Ag, Fe, Pt, Pd, Ce, Rh, and Ni, mixed in any proportion.

7. The energy-saving rapid amine-rich liquid regeneration coupled reactor according to claim 4, characterized in that, The high-resistance conductive substrate has one of the following shapes: spiral, straight, U-shaped, or randomly stacked.

8. The energy-saving rapid amine-rich liquid regeneration coupled reactor according to claim 4, characterized in that, The high-resistance conductive substrate is made of one of the following materials: NiCr alloy, FeCrAl alloy, Al alloy, and Ni alloy.

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