Carbon dioxide absorbent performance evaluation device

Abstract

The utility model relates to the technical field of carbon capture, in particular to a carbon dioxide absorbent performance evaluation device which comprises an absorption tower, a phase splitter and a falling film evaporation desorption device, the cavity of the absorption tower is filled with a filler layer, and the phase splitter is provided with a gas inlet for introducing a gas source with carbon dioxide into the cavity; a liquid inlet communicated with the cavity is formed in the top of the absorption tower and is used for introducing an absorbent into the cavity, and the carbon dioxide and the absorbent are in full contact in the filler layer, so that the absorbent forms a mixed solution; the phase splitter is provided with an inlet and a rich phase outlet, the inlet is communicated with the cavity, so that the mixed liquid flows into the phase splitter, the phase splitter is used for carrying out phase splitting on the mixed liquid to form an absorbent rich solution, the rich phase outlet of the phase splitter is connected with the falling film evaporation desorption device, and the falling film evaporation desorption device is used for desorbing the absorbent rich solution. The carbon dioxide packed tower fully considers the characteristics of the carbon dioxide packed tower applied in practical engineering, the absorbent fully absorbs carbon dioxide through the absorption tower in a laboratory, and the test accuracy is high.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon capture, in particular to a carbon dioxide absorbent performance evaluation device. Background Art

[0002] In the field of carbon capture, chemical absorbents are often used to absorb carbon dioxide to reduce atmospheric CO2 levels. There are many different types of absorbents, and confirming their absorption and desorption properties is essential for absorbent screening.

[0003] In existing technology, laboratory testing of absorbent performance typically involves using a bubble reactor to allow the absorbent to absorb carbon dioxide, followed by sampling and analysis of the carbon dioxide-laden absorbent. Bubble reactors are specialized laboratory reactors, and the way they absorb carbon dioxide differs significantly from how it is adsorbed in actual industrial applications. Consequently, the measured results are insufficient to accurately assess the absorbent's performance in real-world applications and are therefore unconvincing. Utility Model Content

[0004] The utility model provides a carbon dioxide absorbent performance evaluation device, which is used to solve the problem in the prior art that the simulation process of the performance test of the carbon dioxide absorbent in the laboratory is quite different from the absorption process of the absorbent in actual industrial applications, resulting in low precision of the test evaluation indicators and difficulty in ensuring the accuracy of the test.

[0005] The utility model provides a carbon dioxide absorbent performance evaluation device, an absorption tower, a phase separator and a falling film evaporation desorption device; the cavity of the absorption tower is filled with a packing layer, the phase separator is provided with an air inlet, the air inlet is communicated with the cavity, and is used to introduce a gas source containing carbon dioxide into the cavity; the top of the absorption tower is provided with a liquid inlet communicated with the cavity, and is used to introduce an absorbent into the cavity, the carbon dioxide and the absorbent are fully in contact in the packing layer, so that the absorbent forms a mixed liquid;

[0006] The phase separator has an inlet and a rich phase outlet. The inlet is connected to the cavity, allowing the mixed liquid to flow into the phase separator. The phase separator is used to separate the mixed liquid into absorbent-rich liquid. The rich phase outlet of the phase separator is connected to the falling film evaporation desorption device, and the falling film evaporation desorption device is used to desorb the absorbent-rich liquid.

[0007] According to the utility model, a carbon dioxide absorbent performance evaluation device is provided, which also includes an inert gas bottle, a carbon dioxide bottle, a mixed gas pipe and a flow controller. The gas outlets of the inert gas bottle and the carbon dioxide bottle are respectively connected to the gas inlet of the mixed gas pipe, and the gas outlet of the mixed gas pipe is connected to the gas inlet of the absorption tower. The gas outlets of the inert gas bottle and the carbon dioxide bottle are respectively provided with the flow controller.

[0008] According to the utility model, a carbon dioxide absorbent performance evaluation device is provided, which also includes a gas mixer. The inert gas cylinder and the carbon dioxide cylinder are respectively connected to the inlet of the gas mixer, and the gas outlet of the gas mixer is connected to the gas inlet of the absorption tower.

[0009] According to a carbon dioxide absorbent performance evaluation device provided by the utility model, it also includes a circulation pump and a delivery pipe. The phase separator is provided with a circulation outlet for discharging the absorbent. The liquid inlet end of the delivery pipe is connected to the circulation outlet, and the liquid outlet end of the delivery pipe is connected to the liquid inlet of the absorption tower. The circulation pump is arranged on the delivery pipe.

[0010] According to the utility model, a carbon dioxide absorbent performance evaluation device further includes a liquid distributor, which is arranged at the liquid inlet of the absorption tower and is used to provide uniformly distributed absorbent to the packing layer.

[0011] According to a carbon dioxide absorbent performance evaluation device provided by the utility model, the falling film evaporation desorption device includes a circulation tank, a falling film evaporator, a gas-liquid separator and a buffer tank, the inlet of the circulation tank is connected to the rich phase outlet, and the outlet of the circulation tank is connected to the inlet of the falling film evaporator; the first outlet of the falling film evaporator is connected to the inlet of the gas-liquid separator, the second outlet of the falling film evaporator is connected to the inlet of the circulation tank, the first outlet of the gas-liquid separator is connected to the inlet of the circulation tank, and the second outlet of the gas-liquid separator is connected to the buffer tank.

[0012] According to a carbon dioxide absorbent performance evaluation device provided by the utility model, the falling film evaporation desorption device further includes a condenser, a cooler and a collection tank, the gas inlet of the condenser is connected to the second outlet of the gas-liquid separator, the first outlet of the condenser is connected to the gas inlet of the cooler, and the first outlet of the cooler is connected to the interior of the buffer tank;

[0013] The second outlet of the condenser and the second outlet of the cooler are respectively communicated with the interior of the collecting tank.

[0014] According to a carbon dioxide absorbent performance evaluation device provided by the utility model, the falling film evaporation desorption device also includes a cooling medium channel, the medium inlet of the cooler is used to introduce cooling water, the medium outlet of the cooler is connected to the medium inlet of the condenser, and the medium outlet of the condenser is connected to the interior of the buffer tank through the cooling medium channel.

[0015] According to a carbon dioxide absorbent performance evaluation device provided by the utility model, the falling film evaporation desorption device also includes a storage tank, which is arranged below the rich phase outlet and is used to receive the absorbent rich liquid. The outlet of the storage tank is connected to the inlet of the circulation tank.

[0016] According to the carbon dioxide absorbent performance evaluation device provided by the utility model, the falling film evaporation desorption device further includes a vacuum pump, and the vacuum pump is provided between the cooler and the buffer tank.

[0017] The utility model provides a carbon dioxide absorbent performance evaluation device. The cavity of the absorption tower is filled with a packing layer, and a gas source containing carbon dioxide is introduced into the bottom of the cavity of the absorption tower. The carbon dioxide gas source passes through the packing layer from the bottom of the absorption tower under the action of its own buoyancy. At the same time, the top of the absorption tower is provided with a liquid inlet connected to the cavity, which is used to introduce absorbent into the cavity. The absorbent flows into the packing layer under the action of its own gravity, and the carbon dioxide and the absorbent are fully mixed in the packing layer to form a mixed liquid; the inlet of the phase separator is connected to the cavity, so that the mixed liquid flows into the phase separator, and the phase separator phase-separates the mixed liquid to form an absorbent-rich liquid, which is discharged from the rich phase outlet of the phase separator, and the falling film evaporation desorption device can desorb the absorbent-rich liquid. The utility model fully considers the characteristics of the carbon dioxide packed tower applied in actual engineering. In the process of performing performance testing on the carbon dioxide absorbent in the laboratory, the absorbent is fully adsorbed with carbon dioxide through the packing layer. The carbon dioxide absorption process is closer to the actual engineering. The accuracy of the test evaluation index is high, which ensures the accuracy of the performance test of the carbon dioxide absorbent. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is one of the structural schematic diagrams of the carbon dioxide absorbent performance evaluation device provided by the utility model.

[0020] Figure 2This is the second structural schematic diagram of the carbon dioxide absorbent performance evaluation device provided by the present invention.

[0021] Reference numerals:

[0022] 10. Absorption tower; 101. Packing layer; 102. Air inlet; 103. Liquid inlet; 20. Phase separator; 201. Inlet; 202. Rich phase outlet; 203. Circulation outlet; 30. Falling film evaporation desorption device; 301. Circulation tank; 302. Falling film evaporator; 303. Gas-liquid separator; 304. Collection tank; 305. Vacuum pump; 306. Condenser; 307. Cooler; 308. Storage tank; 309. Steam generator; 310. Buffer tank; 311. Cooling medium channel; 40. Inert gas bottle; 50. Carbon dioxide cylinder; 60. Gas mixer; 70. Flow controller; 80. Circulation pump; 90. Delivery pipe; 100. Liquid distributor. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] The terms "first" and "second" in the specification and claims of this utility model may explicitly or implicitly refer to one or more of these features. In the description of this utility model, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected items, and the character " / " generally indicates an "or" relationship between the connected items.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0026] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] The following combination Figure 1-Figure 2 , through specific embodiments and application scenarios, a carbon dioxide absorbent performance evaluation device provided by an embodiment of the present invention is described in detail.

[0028] like Figure 1 and Figure 2 As shown, the present invention provides a device for evaluating the performance of a carbon dioxide absorbent, comprising an absorption tower 10, a phase separator 20, and a falling-film evaporation desorption device 30. The cavity of the absorption tower 10 is filled with a packing layer 101. The phase separator 20 is provided with an air inlet 102, which is connected to the cavity and is used to introduce a gas source containing carbon dioxide into the cavity. The top of the absorption tower 10 is provided with a liquid inlet 103, which is connected to the cavity and is used to introduce absorbent into the cavity. The carbon dioxide and absorbent mix in the packing layer 101 to form a mixed liquid.

[0029] Phase separator 20 has an inlet 201 and a rich phase outlet 202. Inlet 201 communicates with the cavity, allowing the mixed liquid to flow into phase separator 20. Phase separator 20 is used to separate the mixed liquid into absorbent-rich liquid. The rich phase outlet 202 of phase separator 20 is connected to falling film evaporation desorption device 30, which is used to desorb the absorbent-rich liquid.

[0030] It is understandable that the carbon dioxide absorbent performance evaluation device of the present invention is applicable to testing both carbon dioxide homogeneous absorbents and carbon dioxide phase change absorbents. Specifically, Figure 1 As shown, the absorption tower 10 is filled with a packing layer 101. An air inlet 102 is provided at the top of the phase separator 20. After the carbon dioxide source gas is prepared to a target concentration, the carbon dioxide-containing source gas is introduced into the absorption tower 10 through the air inlet 102. The carbon dioxide passes through the packing layer 101 from the bottom of the absorption tower 10 under the action of its own buoyancy.

[0031] At the same time, if Figure 1 As shown, the top of the absorption tower 10 is provided with a liquid inlet 103. After the absorbent is prepared, it is introduced into the absorption tower 10 from the liquid inlet 103. The absorbent flows into the packing layer 101 under its own gravity and is fully mixed with the carbon dioxide gas source to form a mixed liquid adsorbed with carbon dioxide.

[0032] like Figure 1 As shown, the phase separator 20 is provided at the bottom of the absorption tower 10. The phase separator 20 has an inlet 201. The inlet 201 is connected to the cavity of the absorption tower 10, so that the mixed liquid falls into the phase separator 20 under the action of gravity.

[0033] During the absorption evaluation experiment, ventilation to the air inlet 102 of the absorption tower 10 was periodically stopped, and the phase separator 20 was allowed to complete stratification of the mixed liquid. After stratification, samples were taken from the rich phase outlet 202 of the phase separator 20 to analyze the carbon dioxide loading of the absorbent rich liquid. If the difference in carbon dioxide loading between the two samples fell within a preset range, the absorbent rich liquid was considered saturated with carbon dioxide, and the experiment was terminated.

[0034] After obtaining a saturated absorbent rich liquid, the absorbent rich liquid is introduced into a falling-film evaporation desorption unit 30 to desorb the carbon dioxide from the absorbent rich liquid, thereby obtaining a lean absorbent liquid. The carbon dioxide loading of the lean absorbent liquid is measured, and the carbon dioxide loading of the lean absorbent liquid is then compared with the carbon dioxide loading of the saturated absorbent rich liquid to obtain the absorbent's carbon dioxide cycle loading, thereby evaluating the performance of the carbon dioxide absorbent.

[0035] The utility model provides a carbon dioxide absorbent performance evaluation device. The cavity of the absorption tower 10 is filled with a packing layer 101. The top of the phase separator 20 is provided with an air inlet 102, which is connected to the cavity and is used to introduce carbon dioxide into the cavity. Carbon dioxide passes through the packing layer 101 from the bottom of the absorption tower 10 under the action of its own buoyancy. At the same time, the top of the absorption tower 10 is provided with a liquid inlet 103 connected to the cavity and is used to introduce absorbent into the cavity. The absorbent flows into the packing layer 101 under the action of its own gravity. Carbon dioxide and absorbent are fully mixed in the packing layer 101 to form a mixed liquid; phase separation The inlet 201 of the device 20 is connected to the cavity, allowing the mixed liquid to flow into the phase separator 20. The phase separator 20 separates the mixed liquid into phases to form an absorbent-rich liquid, which is discharged from the rich phase outlet 202 of the phase separator 20. The falling film evaporation desorption device 30 can desorb the absorbent-rich liquid. The utility model fully considers the characteristics of the carbon dioxide packed tower used in actual engineering applications. During the performance test of the carbon dioxide absorbent in the laboratory, the absorbent is fully adsorbed with carbon dioxide through the packing layer 101. The carbon dioxide adsorption process is closer to the actual project. The test evaluation index is highly accurate, ensuring the accuracy of the performance test of the carbon dioxide absorbent.

[0036] In order to adjust the ratio of the absorbent and carbon dioxide in the packing layer 101, as shown in FIG. Figure 1As shown, the carbon dioxide absorbent performance evaluation device provided by the present invention also includes an inert gas cylinder 40, a carbon dioxide cylinder 50, a mixed gas pipe and a flow controller 70. The gas outlets of the inert gas cylinder 40 and the carbon dioxide cylinder 50 are respectively connected to the gas inlet of the mixed gas pipe, and the gas outlet of the mixed gas pipe is connected to the gas inlet of the absorption tower 10. The gas outlets of the inert gas cylinder 40 and the carbon dioxide cylinder 50 are respectively provided with flow controllers 70.

[0037] It is understood that the inert gas cylinder 40 contains inert gas, and the carbon dioxide cylinder 50 contains carbon dioxide. The gas outlets of the inert gas cylinder 40 and the carbon dioxide cylinder 50 are both connected to the gas inlet of the mixed gas pipe, so that the inert gas and carbon dioxide gas enter the mixed gas pipe for mixing.

[0038] Specifically, the outlet of the inert gas cylinder 40 and the outlet of the carbon dioxide cylinder 50 are each connected to a branch air pipe, each of which is connected to the inlet of the mixed gas pipe. The outlet of the mixed gas pipe is connected to the gas mixer 60, so that a mixture of inert gas and carbon dioxide gas is introduced into the gas mixer 60. Optionally, the inert gas is nitrogen.

[0039] In some embodiments, the gas outlets of the inert gas cylinder 40 and the carbon dioxide cylinder 50 are each provided with a flow controller 70. The pipeline between the gas outlet of the inert gas cylinder 40 and the gas mixer 60 and the pipeline between the gas outlet of the carbon dioxide cylinder 50 and the gas mixer 60 are both provided with the above-mentioned throttle valve.

[0040] Optionally, the flow controller 70 is a throttle valve, which is electrically connected to a control unit of the entire device, and the control unit controls the working state of the throttle valve, thereby achieving control of the inert gas flow and the carbon dioxide gas flow.

[0041] In some embodiments, the carbon dioxide absorbent performance evaluation device further includes a gas mixer 60. The inert gas cylinder 40 and the carbon dioxide cylinder 50 are respectively connected to the inlet of the gas mixer 60, and the gas outlet of the gas mixer 60 is connected to the gas inlet of the absorption tower 10.

[0042] It is understandable that the gas outlet of the inert gas cylinder 40 and the gas outlet of the carbon dioxide gas cylinder 50 are both directly connected to the gas mixer 60 through a gas pipe, so as to introduce the inert gas and carbon dioxide gas into the gas mixer 60 respectively.

[0043] Alternatively, the gas outlet of the inert gas cylinder 40 and the gas outlet of the carbon dioxide cylinder 50 are both connected to the inlet of the main trachea through a branch trachea, and the outlet of the main trachea is connected to the inlet of the gas mixer 60.

[0044] Under the action of the gas mixer 60, the inert gas can adjust the concentration of the carbon dioxide gas, so that the concentration of the carbon dioxide introduced into the absorption tower 10 meets the ratio requirement.

[0045] Optionally, the gas mixer 60 may be a gas saturator, which can allow the carbon dioxide gas about to enter the absorption tower 10 to fully absorb water vapor to reach a saturated state, so as to prevent the carbon dioxide gas from taking away moisture in the absorbent.

[0046] like Figure 1 As shown, the carbon dioxide absorbent performance evaluation device also includes a circulation pump 80 and a delivery pipe 90. The phase separator 20 is provided with a circulation outlet 203 for discharging the absorbent. The liquid inlet end of the delivery pipe 90 is connected to the circulation outlet 203. The liquid outlet end of the delivery pipe 90 is connected to the liquid inlet 103 of the absorption tower 10. The circulation pump 80 is provided in the delivery pipe 90.

[0047] It is understood that the absorbent is located within the phase separator 20. The liquid inlet end of the delivery pipe 90 is connected to the circulation outlet 203 of the phase separator 20. The liquid outlet end of the delivery pipe 90 is connected to the liquid inlet 103 of the absorption tower 10. The cavity of the absorption tower 10 is connected to the inlet 201 of the phase separator 20. A circulation pump 80 is provided in the delivery pipe 90 to deliver the absorbent to the absorption tower 10 in batches. In this way, the absorbent can achieve cyclic absorption of carbon dioxide, thereby forming a saturated absorbent-rich liquid.

[0048] It should be noted that during the absorption process, the phase separator 20 does not separate the absorbent into phases. At this time, the phase separator 20 is equivalent to a storage tank. After the absorbent is completely absorbed, the phase separator 20 begins to perform static phase separation on the mixed liquid.

[0049] In some embodiments, as Figure 1 As shown, the carbon dioxide absorbent performance evaluation device further includes a liquid distributor 100 . The liquid distributor 100 is provided at the liquid inlet 103 of the absorption tower 10 , and is used to provide uniformly distributed absorbent to the packing layer 101 .

[0050] It is understood that the liquid distributor 100 is installed in the absorption tower 10 and is located above the packing layer 101. The inlet of the liquid distributor 100 is connected to the liquid inlet 103 of the absorption tower 10. The liquid distributor 100 has a plurality of evenly distributed through holes. Each through hole is connected to the inlet of the liquid distributor 100. The plurality of through holes are all oriented toward the packing layer 101 and are used to uniformly introduce absorbent into the packing layer 101. The absorbent can be evenly distributed in the packing layer 101, thereby increasing the contact area with the carbon dioxide and ensuring the adsorption effect of the absorbent.

[0051] In some embodiments, specifically, Figure 2As shown, the falling film evaporation desorption device 30 includes a circulation tank 301, a falling film evaporator 302, a gas-liquid separator 303, and a buffer tank 310. The inlet of the circulation tank 301 is connected to the rich phase outlet 202. The outlet of the circulation tank 301 is connected to the inlet of the falling film evaporator 302. The first outlet of the falling film evaporator 302 is connected to the inlet of the gas-liquid separator 303. The second outlet of the falling film evaporator 302 is connected to the inlet of the circulation tank 301. The first outlet of the gas-liquid separator 303 is connected to the inlet of the circulation tank 301. The second outlet of the gas-liquid separator 303 is connected to the buffer tank 310.

[0052] It is understandable that if Figure 2 As shown, the falling film evaporation desorption device 30 further includes a steam generator 309. The steam generator 309 is capable of evaporating water into high-temperature steam. The high-temperature steam, serving as the heat exchange medium for the falling film evaporator 302, is introduced into the steam passage of the falling film evaporator 302 via an air pipe. A regulating valve is provided on the air pipe. The regulating valve is electrically connected to a control unit, which controls the operating state of the regulating valve to adjust the flow rate of the heat exchange medium within the falling film evaporator 302.

[0053] like Figure 2 As shown, the circulation tank 301 contains saturated absorbent-rich liquid discharged from the rich-phase outlet 202. The outlet of the circulation tank 301 is connected to the inlet 201 of the falling-film evaporator 302, allowing the absorbent-rich liquid to flow into the heating tubes of the falling-film evaporator 302. The absorbent-rich liquid and steam exchange heat within the falling-film evaporator 302, desorbing carbon dioxide from the absorbent-rich liquid.

[0054] The first outlet of the falling film evaporator 302 is connected to the inlet of the gas-liquid separator 303 so that the desorbed carbon dioxide gas can be introduced into the gas-liquid separator 303. The gas-liquid separator 303 can separate the water vapor and absorbent contained in the carbon dioxide to obtain carbon dioxide gas with higher purity. The separated water vapor and absorbent are refluxed into the circulation tank 301 through the first outlet of the gas-liquid separator 303. The carbon dioxide gas is discharged into the buffer tank 310 from the second outlet of the gas-liquid separator 303. After the carbon dioxide gas enters the buffer tank 310, the buffer tank 310 can directly empty the carbon dioxide gas. At the same time, the second outlet of the falling film evaporator 302 is connected to the inlet 201 of the circulation tank 301, so that the desorbed absorbent is refluxed into the circulation tank 301. Furthermore, absorbent introduced from the second outlet of the falling film evaporator 302 and the first outlet of the gas-liquid separator 303 is mixed with the existing absorbent-rich liquid in the circulation tank 301 and then introduced into the heating tube of the falling film evaporator 302 through the inlet 201 for further desorption, thereby achieving cyclic desorption of the absorbent-rich liquid. Desorption of the absorbent-rich liquid by the falling film evaporator 302 overcomes the disadvantage of the high viscosity of the absorbent-rich liquid. Furthermore, the falling film evaporator 302 has high heat transfer efficiency and good desorption effect, allowing direct measurement of absorbent regeneration energy consumption.

[0055] Specifically, if Figure 2 As shown, the falling film evaporation desorption device 30 further includes a condenser 306, a cooler 307, and a collection tank 304. The gas inlet of the condenser 306 is connected to the second outlet of the gas-liquid separator 303. The first outlet of the condenser 306 is connected to the gas inlet of the cooler 307, and the first outlet of the cooler 307 is connected to the interior of the buffer tank 310.

[0056] The second outlet of the condenser 306 and the second outlet of the cooler 307 are respectively communicated with the interior of the collection tank 304 .

[0057] It will be appreciated that a circulation pump 80 and a flow sensor are provided on the pipeline connecting the outlet of the circulation tank 301 and the inlet 201 of the falling film evaporator 302. Both the circulation pump 80 and the flow sensor are electrically connected to the control unit. The circulation pump 80 is used to pump the absorbent-rich solution within the circulation tank 301 into the falling film evaporator 302. The flow sensor is used to detect the circulating volume of the absorbent-rich solution entering the falling film evaporator 302. The control unit controls the operating state of the circulation pump 80 based on the detection information from the flow sensor.

[0058] Before the absorbent-rich liquid enters the falling-film evaporator 302, start the steam generator 309 and introduce cooling water into it to generate steam. The condensate outlet of the steam generator 309 is monitored. If condensate is being discharged, the circulation pump 80 is started again to pump the absorbent-rich liquid into the falling-film evaporator 302 for heating. If the amount of steam is too high during the heating process, the regulating valve can be adjusted to control the heating temperature of the absorbent-rich liquid. When the required heating temperature is reached, the regulating valve is closed to ensure that no steam overflows the condensate outlet of the steam generator 309.

[0059] like Figure 2 As shown, the falling film evaporation desorption device 30 further includes a condenser 306 and a cooler 307. The gas inlet of the condenser 306 is connected to the second outlet of the gas-liquid separator 303, the first outlet of the condenser 306 is connected to the gas inlet of the cooler 307, and the first outlet of the cooler 307 is connected to the collection tank 304, so that multi-stage cooling of carbon dioxide is achieved through the condenser 306 and the cooler 307.

[0060] Furthermore, the second outlet of condenser 306 and the second outlet of cooler 307 are respectively connected to collection tank 304. During the condensation of carbon dioxide gas, condenser 306 and cooler 307 can further separate water vapor and entrained absorbent from the carbon dioxide gas. The separated water vapor and absorbent are stored in collection tank 304, facilitating subsequent analysis and testing of the absorbent-lean solution by the user.

[0061] like Figure 2 As shown, the falling film evaporation desorption device 30 further includes a cooling medium channel 311. The medium inlet of the cooler 307 is used to introduce cooling water. The medium outlet of the cooler 307 is connected to the medium inlet of the condenser 306. The medium outlet of the condenser 306 is connected to the interior of the buffer tank 310 through the cooling medium channel 310.

[0062] It is understood that the cooling water enters the falling film evaporation desorption device 30 from the medium inlet of the cooler 307. The cooling water passes through the cooler 307 and the condenser 306 in sequence, exchanging heat with the carbon dioxide gas in countercurrent. Finally, the cooling water is discharged from the medium outlet of the condenser 306 and discharged into the buffer tank 310 through the cooling medium channel 311 for recovery or emptying.

[0063] In some embodiments, the falling film evaporation desorption device 30 further includes a storage tank 308. The storage tank 308 is located below the rich phase outlet 202 and is used to receive the absorbent rich liquid. The outlet of the storage tank 308 is connected to the inlet of the circulation tank 301.

[0064] It is understood that the storage tank 308 is provided below the rich phase outlet 202 to receive the saturated absorbent rich liquid. The absorbent rich liquid is stored in the storage tank 308 for future use.

[0065] In some embodiments, as Figure 2 As shown, the falling film evaporation desorption device 30 also includes a vacuum pump 305. The vacuum pump 305 is arranged between the cooler 307 and the buffer tank 310. Before the desorption test officially begins, the vacuum pump 305 is used to control the vacuum degree inside the falling film evaporation desorption device 30, so that the absorbent rich liquid in the storage tank 308 flows into the circulation tank 301. The amount of absorbent rich liquid circulating desorption can be regulated by setting the configuration parameters of the vacuum pump 305. In addition, a feed flow meter can be set on the pipeline between the storage tank 308 and the circulation tank 301, and the feed amount of the storage tank 308 to the circulation tank 301 can be controlled by observing the flow reading of the feed flow meter.

[0066] Optionally, the vacuum level within the falling-film evaporation and desorption device 30 is maintained at 60 kPa by controlling the vacuum valve of the vacuum pump 305. The vacuum valve can be adjusted to an appropriate position by setting a negative pressure gauge and observing the reading on the gauge. When the lean absorbent solution within the circulation tank 301 reaches the set desorption time, the entire falling-film evaporation and desorption device 30 is closed, and the lean absorbent solution is measured to determine the lean absorbent solution load.

[0067] After the desorption test is completed, the carbon dioxide gas is cooled step by step between the condenser 306 and the cooler 307, and a higher purity carbon dioxide gas is obtained at the first outlet of the cooler 307. The vacuum pump 305 then pumps the carbon dioxide gas to the buffer tank 310 for emptying.

[0068] The following is an introduction with reference to specific embodiments.

[0069] Example 1

[0070] Accurately weigh 2650g of diethylethanolamine, 3100g of n-pentanol, 540g of piperazine, and 2700g of distilled water respectively; mix the above chemicals evenly to form an absorbent. Then pour the absorbent into the phase separator; then set the gas partial pressure to 20Kpa and the total flow rate of the nitrogen and carbon dioxide mixture to 0.3Nm3 / min. The mixed gas is passed into the absorption tower and the circulation pump is turned on. Set the flow rate of the circulation pump to 1L / min. The time for the absorbent to absorb carbon dioxide is set to 2h. After absorption, turn off the circulation pump and the gas source. Let it stand for a while until the phase separator is stratified, then release the absorbent rich liquid in the lower layer from the rich phase outlet of the phase separator and load it into the storage tank. Use a titration device to sample and test the saturation load of the absorbent rich liquid, and desorb the remaining absorbent rich liquid in the storage tank.

[0071] The falling film evaporator temperature was controlled between 90-95°C. The desorption time was approximately 1 hour. After desorption, the desorbent lean solution was sampled and analyzed to measure the lean solution load, thereby obtaining the absorbent cycle load. During the desorption process, the steam consumption and the amount of carbon dioxide collected as measured by the gas flow meter were recorded as reference indicators for evaluating the absorbent's performance. The measured data for this example are shown in the following table:

[0072]

[0073] Example 2

[0074] Accurately weigh 1500g of diethylethanolamine and 3500g of distilled water respectively and mix them evenly to form an absorbent. Pour the absorbent into the phase separator. The partial pressure of the configured gas is 20Kpa. The total flow rate of the mixture of nitrogen and carbon dioxide is 2.5Nm3 / min. The mixed gas is passed into the absorption tower and the circulation pump is turned on. Set the flow rate of the circulation pump to 1L / min. The time for the absorbent to absorb carbon dioxide is set to 1h. After the absorption is completed, turn off the circulation pump and the gas source. After standing for a while and the phase separator is stratified, the absorbent rich liquid in the lower layer is released from the rich phase outlet of the phase separator and loaded into the storage tank. Use a titration device to take samples to test the saturation load of the absorbent rich liquid, and desorb the remaining absorbent rich liquid in the storage tank.

[0075] The falling film evaporator temperature was controlled between 100-105°C. The desorption time was approximately 1 hour. After desorption was complete, the desorbent lean solution was sampled and analyzed to measure the lean solution load, thereby determining the absorbent cycle load. During the desorption process, steam consumption was recorded, along with the amount of carbon dioxide collected as measured by the gas flow meter, as a reference indicator for evaluating absorbent performance. The measured data for this example are shown in the following table:

[0076]

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A carbon dioxide absorbent performance evaluation device, characterized in that: include: An absorption tower, a phase separator, and a falling film evaporation desorption device; the cavity of the absorption tower is filled with a packing layer, the phase separator is provided with an air inlet, the air inlet is connected to the cavity, and is used to introduce a gas source containing carbon dioxide into the cavity; the top of the absorption tower is provided with a liquid inlet connected to the cavity, and is used to introduce an absorbent into the cavity, and the carbon dioxide and the absorbent are fully contacted in the packing layer to form a mixed liquid; The phase separator has an inlet and a rich phase outlet. The inlet is connected to the cavity, allowing the mixed liquid to flow into the phase separator. The phase separator is used to separate the mixed liquid into absorbent-rich liquid. The rich phase outlet of the phase separator is connected to the falling film evaporation desorption device, and the falling film evaporation desorption device is used to desorb the absorbent-rich liquid.

2. The carbon dioxide absorbent performance evaluation device according to claim 1, characterized in that: It also includes an inert gas cylinder, a carbon dioxide cylinder, a mixed gas pipe and a flow controller. The gas outlets of the inert gas cylinder and the carbon dioxide cylinder are respectively connected to the gas inlet of the mixed gas pipe, the gas outlet of the mixed gas pipe is connected to the gas inlet of the absorption tower, and the gas outlets of the inert gas cylinder and the carbon dioxide cylinder are respectively provided with the flow controller.

3. The carbon dioxide absorbent performance evaluation device according to claim 2, characterized in that: It also includes a gas mixer, the inert gas cylinder and the carbon dioxide gas cylinder are connected to the inlet of the gas mixer respectively, and the gas outlet of the gas mixer is connected to the gas inlet of the absorption tower.

4. The carbon dioxide absorbent performance evaluation device according to claim 1, characterized in that: It also includes a circulation pump and a delivery pipe. The phase separator is provided with a circulation outlet for discharging the absorbent. The liquid inlet end of the delivery pipe is connected to the circulation outlet, and the liquid outlet end of the delivery pipe is connected to the liquid inlet of the absorption tower. The circulation pump is provided in the delivery pipe.

5. The carbon dioxide absorbent performance evaluation device according to claim 1, characterized in that: It also includes a liquid distributor, which is arranged at the liquid inlet of the absorption tower and is used to provide uniformly distributed absorbent to the packing layer.

6. The carbon dioxide absorbent performance evaluation device according to claim 1, characterized in that: The falling film evaporation desorption device includes a circulation tank, a falling film evaporator, a gas-liquid separator and a buffer tank. The inlet of the circulation tank is connected to the rich phase outlet, and the outlet of the circulation tank is connected to the inlet of the falling film evaporator; the first outlet of the falling film evaporator is connected to the inlet of the gas-liquid separator, the second outlet of the falling film evaporator is connected to the inlet of the circulation tank, the first outlet of the gas-liquid separator is connected to the inlet of the circulation tank, and the second outlet of the gas-liquid separator is connected to the buffer tank.

7. The carbon dioxide absorbent performance evaluation device according to claim 6, characterized in that: The falling film evaporation desorption device further includes a condenser, a cooler and a collection tank, the gas inlet of the condenser is connected to the second outlet of the gas-liquid separator, the first outlet of the condenser is connected to the gas inlet of the cooler, and the first outlet of the cooler is connected to the interior of the buffer tank; The second outlet of the condenser and the second outlet of the cooler are respectively communicated with the interior of the collecting tank.

8. The carbon dioxide absorbent performance evaluation device according to claim 7, characterized in that: The falling film evaporation desorption device also includes a cooling medium channel, the medium inlet of the cooler is used to introduce cooling water, the medium outlet of the cooler is connected to the medium inlet of the condenser, and the medium outlet of the condenser is connected to the interior of the buffer tank through the cooling medium channel.

9. The carbon dioxide absorbent performance evaluation device according to claim 6, characterized in that: The falling film evaporation desorption device further comprises a storage tank, which is arranged below the rich phase outlet and is used to receive the absorbent rich liquid. The outlet of the storage tank is communicated with the inlet of the circulation tank.

10. The carbon dioxide absorbent performance evaluation device according to claim 7, characterized in that: The falling film evaporation desorption device further comprises a vacuum pump, which is arranged between the cooler and the buffer tank.

Images