Device for purifying carbon dioxide in flue gas and control method thereof

Abstract

The invention provides a device for purifying carbon dioxide in flue gas and a control method thereof, and relates to the technical field of carbon dioxide purification, the device comprises a shell used for purifying carbon dioxide in flue gas, a reboiling structure used for pregnant solution desorption is arranged at the bottom in the shell, and the left side of the reboiling structure penetrates through the shell and is communicated with a pregnant solution pipe of an external absorption tower; a circulating structure is arranged on the left side of the top of the reboiling structure, a preheating structure is fixedly communicated with the left side of the reboiling structure, and the interior of the preheating structure is matched with the surface of the reboiling structure; a uniform distribution structure for steam distribution is arranged at the top of the reboiling structure, and the surface of the uniform distribution structure is fixedly connected with the inner wall of the shell. By arranging the shell, the reboiling structure, the circulating structure, the preheating structure, the uniform distribution structure, the cooling structure, the cleaning structure and the discharge pipe, the problems that an existing flue gas carbon dioxide purification device cannot perform preliminary preheating and is low in barren liquor recovery rate are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon dioxide purification, in particular to a carbon dioxide purification device in flue gas and a control method thereof. BACKGROUND

[0002] Carbon dioxide purification is a process involving multiple process steps and key control points. When selecting a carbon dioxide purification system, the enterprise needs to focus on the following core dimensions: recovery efficiency: the recovery efficiency directly determines the utilization rate of carbon dioxide resources and is the core indicator of system evaluation. An efficient system can recover as much carbon dioxide as possible from waste gas, improving resource utilization. Energy-saving level: the energy consumption of the system directly affects the operating cost of the enterprise. Therefore, when selecting the system, attention should be paid to its energy-saving performance, and a system with low energy consumption and reasonable operating cost should be selected. Gas source adaptability: the composition of waste gas of different enterprises is quite different, so the system needs to have the ability to adapt to various gas sources. An excellent purification system should be able to deal with different gas sources such as coal-fired and chemical industries to meet the diversified needs of enterprises. With the global promotion of the "carbon peak and carbon neutral" goal, carbon capture, utilization and storage (CCUS) technology has become a key way to reduce industrial carbon emissions. Among them, capturing and purifying carbon dioxide from flue gas is one of the core links, and the chemical absorption method (usually using amine liquid as the absorbent) is a widely used technology.

[0003] In order to improve resource utilization, coal-fired power plants need to use a flue gas carbon dioxide purification device. In the traditional chemical absorption method process, the rich liquid rich in carbon dioxide needs to be regenerated in the desorption tower (or regeneration tower) by heating to release high-purity CO2 gas and regenerate the lean liquid that can be recycled. However, the flue gas carbon dioxide purification device consumes a large amount of heat energy during the desorption of the rich liquid. However, when the rich liquid just enters the desorption operation, the desorption temperature cannot be reached due to the low temperature of the rich liquid, which will result in poor desorption effect. At the same time, when the steam is separated, the water droplets of the lean liquid are adsorbed on the outer wall of the pipeline, reducing the contact area of the steam with the pipeline and reducing the recovery effect. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application aims to provide a carbon dioxide purification device in flue gas and a control method thereof, which can conveniently preliminarily heat the rich liquid and conveniently recover the lean liquid, to solve the problems of the existing flue gas carbon dioxide purification device that cannot be preliminarily preheated and the low recovery rate of the lean liquid.

[0005] In order to achieve the above object, the present application is realized by the following technical scheme: a flue gas carbon dioxide purification device and its control method, including a shell for flue gas carbon dioxide purification, the bottom of the shell is provided with a reboiling structure for rich liquid desorption, the left side of the reboiling structure penetrates the shell and communicates with the rich liquid pipe of the external absorption tower, the left side of the top of the reboiling structure is provided with a circulating structure, the left side of the reboiling structure is fixedly communicated with a preheating structure, the inside of the preheating structure is used in cooperation with the surface of the reboiling structure; The top of the reboiling structure is provided with a uniform distribution structure for steam distribution, the surface of the uniform distribution structure is fixedly connected with the inner wall of the shell, the top of the uniform distribution structure is provided with a cooling structure for steam cooling, and the surface of the cooling structure is provided with a cleaning structure for water removal; The top of the shell is fixedly communicated with a discharge pipe for discharging carbon dioxide.

[0006] Further, the reboiling structure comprises two first sealing plates, the two first sealing plates are arranged in an upper and lower manner, the surfaces of the first sealing plates are fixedly connected with the inner wall of the shell, first partition plates are fixedly connected on both sides between the two first sealing plates, the front side and the rear side of the first partition plates are fixedly connected with the inner wall of the shell, a first pipe bundle is arranged between the opposite sides of the two first partition plates, the two sides of the first pipe bundle penetrate the first partition plates and extend to one side of the first partition plates, a first water inlet pipe for hot water inlet is arranged on the right side of the right first partition plate, the right side of the first water inlet pipe penetrates the shell and extends to the right side of the shell, a first water outlet pipe for hot water outlet is arranged on the left side of the left first partition plate, the left side of the first water outlet pipe penetrates the shell and extends to the left side of the shell, a first water pump is fixedly connected with the bottom of the inner wall of the shell, a first conduit is fixedly communicated with the input end of the first water pump, the left side of the first conduit penetrates the shell and extends to the left side of the shell, a second conduit is fixedly communicated with the output end of the first water pump, the top of the second conduit penetrates the bottom of the first sealing plate and extends to the bottom of the first pipe bundle, a third conduit for lean liquid and steam discharge is fixedly communicated with the inside of the top first sealing plate, a dispersion structure for rich liquid dispersion is arranged on the bottom of the first pipe bundle, a first cavity is formed between the first sealing plate, the first partition plate, the shell and the first pipe bundle, the first pipe bundle is saturated water vapor, and the right side of the preheating structure is fixedly communicated with the first partition plate of the shell.

[0007] Further, the dispersion structure comprises a first motor, the bottom of the first motor is fixedly connected with the bottom of the inner wall of the shell, the output end of the first motor penetrates the first sealing plate and is fixedly connected with a rotating disc, the surface of the rotating disc is fixedly connected with a dispersion plate for dispersing rich liquid, the number of the dispersion plates is several and is uniformly distributed, and the number of the first pipe bundle is several and is arranged in an integral column. The present application has the advantages that the flue gas carbon dioxide purification device can realize the desorption of rich liquid and the preheating of lean liquid, the circulation of lean liquid and the dispersion of rich liquid, and the flue gas carbon dioxide purification device can realize the desorption of rich liquid, the preheating of lean liquid, the circulation of lean liquid and the dispersion of rich liquid, and the flue gas carbon dioxide purification device can realize the desorption of rich liquid, the preheating of lean liquid, the circulation of lean liquid and the dispersion of rich liquid.

[0008] Further, the circulating structure comprises a communication pipe for poor liquid discharge, the communication pipe is located at the top of the first sealing plate, the right side of the communication pipe is fixedly communicated with the left side of the shell, the left side of the communication pipe is fixedly communicated with a fourth conduit, the other end of the fourth conduit is fixedly communicated with a storage box, the rear side of the storage box is provided with a second water pump, the input end of the second water pump is fixedly communicated with a fifth conduit, the front side of the fifth conduit is fixedly communicated with the bottom of the rear side of the storage box.

[0009] Further, the inner wall of the storage box is fixedly connected with a filter plate for impurity filtration, the middle part of the filter plate is recessed, and the two sides are inclined, the rear side of the storage box is fixedly communicated with a impurity discharge pipe for impurity discharge at the top of the filter plate, the right side of the top of the first sealing plate is provided with a liquid level pipe for liquid level display.

[0010] Further, the preheating structure comprises a coil pipe fixedly communicated with the first water outlet pipe, the middle part of the coil pipe is annularly distributed on the surface of the first conduit, the surface of the coil pipe is sleeved with a hollow shell, the inside of the hollow shell is fixedly connected with the surface of the first conduit, and the top of the hollow shell is fixedly communicated with a water adding pipe.

[0011] Further, the uniform distribution structure comprises a plurality of separation fences, the separation fences are arranged on the top of the first sealing plate, the separation fence comprises a separation plate, the two ends of the separation plate are fixedly connected with the inner wall of the shell, the two sides of the bottom of the separation plate are arc-shaped edges, the number of the separation plates is several and is uniformly distributed, the plurality of separation fences are spirally distributed, and the staggered angle of the upper and lower layers is forty-five degrees.

[0012] Further, the cooling structure comprises a communication frame for circulating air, the communication frame is located on the top of the uniform distribution structure, the top and bottom of the surface of the communication frame are fixedly connected with a second sealing plate, the surface of the second sealing plate is fixedly connected with the inner wall of the shell, the inside of the communication frame is provided with a second tube bundle, the two ends of the second tube bundle are fixedly communicated with a dispersion box and penetrate the communication frame, the right side of the right side of the dispersion box is fixedly communicated with a second water inlet pipe, the right side of the second water inlet pipe penetrates the shell and extends to the right side of the shell, the left side of the left side of the dispersion box is fixedly communicated with a second water outlet pipe, the left side of the second water outlet pipe penetrates the shell and extends to the left side of the shell, the number of the second tube bundles is several and is staggered, a second cavity is formed between the communication frame and the second tube bundle, and the second tube bundle is cold air.

[0013] Further, the cleaning structure comprises a second motor, the second motor is located at the top of the right side of the shell, the surface of the second motor is fixedly connected with a fixing frame, the left side of the fixing frame is fixedly connected with the surface of the shell, the output end of the second motor penetrates to the inside of the shell and is fixedly connected with a screw rod, the surface of the screw rod is threadedly connected with a screw sleeve, the surface of the screw sleeve is fixedly connected with a moving plate, the inside of the moving plate is used in cooperation with the surface of the second tube bundle, and the inside of the moving plate is provided with a flexible scraper plate between the second tube bundle for water removal on the surface of the second tube bundle.

[0014] A control method of a carbon dioxide purification device in flue gas, the control method comprising the following steps: Step S1, connecting with the inlet and outlet of the external boiler through the first water inlet pipe and the first water outlet pipe, communicating with the rich liquid pipe at the bottom of the absorption tower through the first conduit, starting the first water pump, and the first water pump draws the rich liquid at the bottom of the absorption tower out through the first conduit and the rich liquid pipe, and inputs into the inside of the first cavity through the second conduit, and uniformly disperses through the dispersion structure; Step S2, under the heating of the saturated water vapor of 100-120 DEG C in the first tube bundle, the rich liquid in the first cavity reversely reacts, the carbon dioxide is desorbed from the rich liquid, the rich liquid is decomposed into lean liquid and steam and is pushed out upward, the lean liquid falls on the top first sealing plate through the third conduit and is input into the absorption tower for reuse after being filtered through the circulation structure, and the steam moves upward; Step S3, the steam is dispersed through the uniform distribution structure; Step S4, the dispersed steam passes through the second cavity, the steam contacts the surface of the second tube bundle, the steam is cooled and becomes water droplets and carbon dioxide, the water droplets are formed on the surface of the second tube bundle, the water droplets are cleaned and fall down through the cleaning structure, and the carbon dioxide is discharged upward through the discharge pipe and is utilized.

[0015] The beneficial effects of the present application are: 1, by setting the shell, the reboiling structure, the circulation structure, the preheating structure, the uniform distribution structure, the cooling structure, the cleaning structure and the discharge pipe, the efficiency and effect of the carbon dioxide purification in flue gas can be improved, the reboiling structure promotes the effective desorption of the rich liquid, the carbon dioxide can be efficiently released from the rich liquid, the preheating structure and the reboiling structure are used in cooperation, the utilization of heat energy is optimized, the overall energy efficiency of the system is improved, the uniform distribution structure ensures the uniform distribution of the steam on the top of the reboiling structure, the problems of local overheating or uneven cooling are avoided, the uniformity of the purification is improved, and the combination of the cooling structure and the cleaning structure effectively realizes the cooling and water removal of the steam, and ensures the purity of the finally discharged carbon dioxide.

[0016] 2、The present application can improve heat exchange efficiency and liquid processing capacity by setting reboiling structure, dispersion structure, circulation structure, filter plate, impurity removal pipeline, liquid level pipe and preheating structure, the reboiling structure realizes effective circulation of hot water in the pipe bundle through the first sealing plate, first partition plate and first pipe bundle, and ensures stable supply of saturated water vapor, improves heat exchange efficiency and helps to maintain stable operation of the system, the dispersion structure rotates the rotating disc and dispersion plate by the first motor, and uniformly disperses the rich liquid at the bottom of the first pipe bundle, increases the contact area of the rich liquid and saturated water vapor, and improves the heat exchange efficiency, the circulation structure realizes effective circulation and reuse of the lean liquid through the cooperation of the communication pipe, fourth conduit, storage tank and second water pump, the filter plate can effectively remove impurities in the liquid, ensure clean and efficient operation of the system, and the preheating structure uses the heat in the first conduit to preheat the rich liquid entering the system, thereby improving the heat utilization efficiency of the whole system.

[0017] 3、The present application is provided with uniform distribution structure, cooling structure and cleaning structure, the uniform distribution structure is provided with spiral distribution and staggered setting of multiple layers of partition bars, which effectively improves the space utilization, makes the flow of steam in the equipment more uniform, and the arc-shaped edge at the bottom of the partition plate helps to reduce flow resistance and facilitate dispersion of steam, the cooling structure realizes circulation and efficient heat exchange of the cooling medium through the communication frame, second sealing plate, second pipe bundle and dispersion tank, the staggered setting of the second pipe bundle increases the heat exchange area and improves the cooling efficiency, the cold air in the second cavity as the cooling medium enhances the cooling effect and ensures stable operation of the equipment, and the cleaning structure realizes automatic cleaning of the surface of the second pipe bundle through the second motor, fixed frame, screw rod, screw sleeve, moving plate and flexible scraper, effectively avoids accumulation of scale and impurities and ensures stable heat exchange efficiency of the cooling medium. BRIEF DESCRIPTION OF DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings: Figure 1 is a structural schematic view of the present application; Figure 2 is a sectional view of the outer shell; Figure 3 is a sectional view of the first sealing plate; Figure 4 is a perspective view of the dispersion structure; Figure 5 is a perspective view of the partition plate; Figure 6 is a sectional view of the hollow shell; Figure 7 is a perspective view of the circulation structure; Figure 8 is a perspective view of the cooling structure; Figure 9 is a perspective view of the cleaning structure.

[0019] In the figure: 1, shell; 2, discharge pipe; 3, first sealing plate; 4, first partition plate; 5, first tube bundle; 6, first water inlet pipe; 7, first water outlet pipe; 8, first water pump; 9, first conduit; 10, second conduit; 11, third conduit; 12, first motor; 13, rotating disc; 14, dispersion plate; 15, communication pipe; 16, fourth conduit; 17, storage tank; 18, second water pump; 19, fifth conduit; 20, filter plate; 21, impurity discharge pipe; 22, liquid level pipe; 23, coil pipe; 24, hollow shell; 25, water filling pipe; 26, partition plate; 27, communication frame; 28, second sealing plate; 29, second tube bundle; 30, dispersion tank; 31, second water inlet pipe; 32, second water outlet pipe; 33, second motor; 34, fixing frame; 35, screw rod; 36, screw sleeve; 37, moving plate; 38, flexible scraper. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, purposes and effects achieved by the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0021] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of the present application.

[0022] A carbon dioxide purification device in flue gas and a control method thereof, comprising a shell 1 for carbon dioxide purification in flue gas, a reboiling structure for rich liquid desorption is arranged at the bottom of the inside of the shell 1, the left side of the reboiling structure penetrates the shell 1 and communicates with the rich liquid pipe of the external absorption tower, a circulating structure is arranged at the left top of the reboiling structure, a preheating structure is fixedly communicated on the left side of the reboiling structure, and the inside of the preheating structure is used in cooperation with the surface of the reboiling structure; A uniform distribution structure for steam distribution is arranged at the top of the reboiling structure, the surface of the uniform distribution structure is fixedly connected with the inner wall of the shell 1, a cooling structure for steam cooling is arranged at the top of the uniform distribution structure, and the surface of the cooling structure is provided with a cleaning structure for water removal; A discharge pipe 2 for discharging carbon dioxide is fixedly communicated at the top of the shell 1.

[0023] Please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , and Figure 9 , Figure 2 is a sectional perspective view of the shell;Figure 3 is a sectional view of the first sealing plate; Figure 4 is a perspective view of a dispersion structure; Figure 5 is a perspective view of a partition plate; Figure 6 is a sectional view of a hollow shell; Figure 7 is a perspective view of a circulation structure; Figure 8 is a perspective view of a cooling structure; Figure 9 is a perspective view of a cleaning structure.

[0024] The reboiling structure comprises two first sealing plates 3, which are arranged in an upper and lower manner, the surfaces of the first sealing plates 3 are fixedly connected with the inner wall of the shell 1, two first partition plates 4 are fixedly connected between the two sides of the two first sealing plates 3, the front side and the rear side of the first partition plate 4 are fixedly connected with the inner wall of the shell 1, a first tube bundle 5 is arranged between the opposite sides of the two first partition plates 4, the two sides of the first tube bundle 5 penetrate through the first partition plate 4 and extend to one side of the first partition plate 4, a first water inlet pipe 6 for hot water entering is arranged on the right side of the right first partition plate 4, the right side of the first water inlet pipe 6 penetrates through the shell 1 and extends to the right side of the shell 1, a first water outlet pipe 7 for hot water discharging is arranged on the left side of the left first partition plate 4, the left side of the first water outlet pipe 7 penetrates through the shell 1 and extends to the left side of the shell 1, a first water pump 8 is fixedly connected to the bottom of the inner wall of the shell 1, an input end of the first water pump 8 is fixedly connected with a first conduit 9, the left side of the first conduit 9 penetrates through the shell 1 and extends to the left side of the shell 1, an output end of the first water pump 8 is fixedly connected with a second conduit 10, the top of the second conduit 10 penetrates through the bottom first sealing plate 3 and extends to the bottom of the first tube bundle 5, an inside of the top first sealing plate 3 is fixedly connected with a third conduit 11 for discharging lean liquid and steam, a dispersion structure for dispersing rich liquid is arranged at the bottom of the first tube bundle 5, a first cavity is formed between the first sealing plate 3, the first partition plate 4, the shell 1 and the first tube bundle 5, the first tube bundle 5 is saturated water vapor, a preheating structure is fixedly connected with the first partition plate 4 of the shell 1 at the right side, the dispersion structure comprises a first motor 12, the bottom of the first motor 12 is fixedly connected with the bottom of the inner wall of the shell, an output end of the first motor 12 penetrates through the first sealing plate 3 and is fixedly connected with a rotating disc 13, the surface of the rotating disc 13 is fixedly connected with a dispersion plate 14 for dispersing rich liquid, the number of the dispersion plate 14 is several and is uniformly distributed, the number of the first tube bundle 5 is several and is arranged in an integral column, the circulation structure comprises a communication pipe 15 for discharging lean liquid, the communication pipe 15 is arranged at the top of the top first sealing plate 3, the right side of the communication pipe 15 is fixedly connected with the left side of the shell 1, the left side of the communication pipe 15 is fixedly connected with a fourth conduit 16, the other end of the fourth conduit 16 is fixedly connected with a storage tank 17, the rear side of the storage tank 17 is provided with a second water pump 18, an input end of the second water pump 18 is fixedly connected with a fifth conduit 19, the front side of the fifth conduit 19 is fixedly connected with the bottom of the rear side of the storage tank 17, the inner wall of the storage tank 17 is fixedly connected with a filter plate 20 for filtering impurities, the middle part of the filter plate 20 is recessed and the two sides are arranged in an inclined manner, the rear side of the storage tank 17 is fixedly connected with a impurity discharge pipeline 21 for discharging impurities on the top of the filter plate 20, the right side of the top first sealing plate 3 is provided with a liquid level pipe 22 for liquid level display, the preheating structure comprises a coil pipe 23 fixedly connected with the first water outlet pipe 7, the middle part of the coil pipe 23 is annularly arranged on the surface of the first conduit 9, the surface of the coil pipe 23 is sleeved with a hollow shell 24, the inside of the hollow shell 24 is fixedly connected with the surface of the first conduit 9, the top of the hollow shell 24 is fixedly connected with a water adding pipe 25,The reboiling structure realizes effective circulation of hot water in the tube bundle through the first sealing plate 3, the first partition plate 4 and the first tube bundle 5, ensures stable supply of saturated water vapor, improves heat exchange efficiency and helps maintain stable operation of the system, the dispersion structure drives the rotating disc 13 and the dispersion plate 14 to rotate by the first motor 12, uniformly disperses the rich liquid at the bottom of the first tube bundle 5, increases the contact area of the rich liquid and the saturated water vapor, improves the heat exchange efficiency, the circulation structure realizes effective circulation and reuse of the lean liquid through the cooperation of the communication pipe 15, the fourth conduit 16, the storage tank 17 and the second water pump 18, and the setting of the filter plate 20 can also effectively remove impurities in the liquid, ensuring clean and efficient operation of the system, the preheating structure uses the heat in the first conduit 9 to preheat the rich liquid entering the system through the coil pipe 23 and the hollow shell 24, thereby improving the heat utilization efficiency of the whole system.

[0025] The uniform distribution structure includes a plurality of partition bars arranged on the top of the first sealing plate 3, and each partition bar includes a partition plate 26 fixedly connected to the inner wall of the shell 1 at both ends, and the bottom of the partition plate 26 is provided with an arc-shaped edge at both sides, the number of the partition plates 26 is several, and the partition plates 26 are uniformly distributed, the plurality of partition bars are spirally distributed, and the staggered angle between the upper and lower layers is forty-five degrees, the cooling structure includes a communication frame 27 for circulating air, the communication frame 27 is located at the top of the uniform distribution structure, the top and bottom of the surface of the communication frame 27 are fixedly connected with the second sealing plate 28, the surface of the second sealing plate 28 is fixedly connected with the inner wall of the shell 1, the second tube bundle 29 is arranged in the communication frame 27, both ends of the second tube bundle 29 penetrate through the communication frame 27 and are fixedly connected with the dispersion tank 30, the right side of the right dispersion tank 30 is fixedly connected with the second water inlet pipe 31, the right side of the second water inlet pipe 31 penetrates through the shell 1 and extends to the right side of the shell 1, the left side of the left dispersion tank 30 is fixedly connected with the second water outlet pipe 32, the left side of the second water outlet pipe 32 penetrates through the shell 1 and extends to the left side of the shell 1, the number of the second tube bundle 29 is several, and the second tube bundle 29 is arranged in a staggered manner, a second cavity is formed between the communication frame 27 and the second tube bundle 29, and the second tube bundle 29 is filled with cold air, the cleaning structure includes a second motor 33 located at the top of the right side of the shell 1, the surface of the second motor 33 is fixedly connected with a fixing frame 34, the left side of the fixing frame 34 is fixedly connected with the surface of the shell 1, the output end of the second motor 33 penetrates into the inside of the shell 1 and is fixedly connected with a screw rod 35, the surface of the screw rod 35 is threadedly connected with a screw sleeve 36, the surface of the screw sleeve 36 is fixedly connected with a moving plate 37, the inside of the moving plate 37 cooperates with the surface of the second tube bundle 29, and a flexible scraper 38 for removing water from the surface of the second tube bundle 29 is arranged between the inside of the moving plate 37 and the second tube bundle 29, the spiral distribution and staggered arrangement of the plurality of partition bars of the uniform distribution structure effectively improve the space utilization, the flow of steam in the equipment is more uniform, the arc-shaped edge design of the bottom of the partition plate 26 helps to reduce the flow resistance and facilitate the dispersion of steam, the cooling structure realizes the circulation and flow of the cooling medium and efficient heat exchange through the communication frame 27, the second sealing plate 28, the second tube bundle 29 and the dispersion tank 30, the staggered arrangement of the second tube bundle 29 increases the heat exchange area and improves the cooling efficiency, the cold air in the second cavity serves as the cooling medium, enhances the cooling effect, and ensures the stable operation of the equipment, and the cleaning structure realizes the automatic cleaning of the surface of the second tube bundle 29 through the second motor 33, the fixing frame 34, the screw rod 35, the screw sleeve 36, the moving plate 37 and the flexible scraper 38, effectively avoids the accumulation of scale and impurities, and ensures the stability of the heat exchange efficiency of the cooling medium.

[0026] Working principle: the present application relates to the equipment of carbon dioxide purification in flue gas, its core working principle is based on the synergies of reboiling structure, uniform distribution structure, cooling structure and cleaning structure, when working, rich liquid from absorption tower enters reboiling structure through rich liquid pipe, in reboiling structure, rich liquid is uniformly dispersed in the bottom of first tube bundle 5 by dispersion structure, dispersion structure is rotated by first motor 12 driving turntable 13 and dispersion plate 14, increase the contact area of rich liquid and saturated water vapor, improve heat exchange efficiency, saturated water vapor flows in first tube bundle 5, exchanges heat with rich liquid, makes carbon dioxide in rich liquid desorb, hot water enters reboiling structure through first water inlet pipe 6, circulates in first tube bundle 5, provides necessary heat, heated hot water is discharged through first water outlet pipe 7, preheating structure preheats rich liquid entering system by the heat in first conduit 9, further improves heat utilization efficiency, desorbed carbon dioxide vapor rises to uniform distribution structure, uniform distribution structure is composed of multiple layers of partition, is distributed in spiral and is set in staggered mode in upper and lower layers, effectively improves space utilization, makes vapor flow more uniform, the arc-shaped edge at the bottom of partition plate 26 reduces flow resistance, facilitates vapor dispersion, vapor continues to rise to cooling structure, exchanges heat with cold air in communication frame 27 through second tube bundle 29, condenses into liquid after cooling, second tube bundle 29 is staggered to increase heat exchange area and improve cooling efficiency, the liquid after cooling falls on the top of first sealing plate 3 and is discharged through communication pipe 15, to ensure the stability of heat exchange efficiency of cooling medium, cleaning structure automatically cleans the surface of second tube bundle 29 regularly, second motor 33 drives screw rod 35 to rotate, moves moving plate 37 and flexible scraper 38 along the surface of second tube bundle 29 through screw sleeve 36, removes condensed liquid, the purified carbon dioxide is discharged from the equipment through discharge pipe 2, and the lean liquid is effectively circulated and reused through the circulation structure, the lean liquid is discharged from the communication pipe 15, enters the storage tank 17 through the fourth conduit 16, and the filter plate 20 in the storage tank 17 filters the impurities in the lean liquid, to ensure the clean and efficient operation of the system, and the filtered lean liquid is recycled into the system again through the second water pump 18 and the related pipelines.

[0027] The above shows and describes the basic principles and main features of the present application and the advantages of the present application, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0028] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature described. The specification can include implicit combinations of explicitly mentioned features and / or explicit combinations of implicitely mentioned features. Each embodiment depends on the explicit combinations of features and / or the implicit combinations of features made specifically within that embodiment, and each such embodiment can be combined with every other such embodiment to create further embodiments.

Claims

1. A device for purifying carbon dioxide from flue gas, characterized in that: It includes an outer shell (1) for purifying carbon dioxide in flue gas. The bottom of the inner shell (1) is provided with a reboiling structure for rich liquid desorption. The left side of the reboiling structure penetrates the outer shell (1) and is connected to the rich liquid pipe of the external absorption tower. A circulation structure is provided on the left side of the top of the reboiling structure. A preheating structure is fixedly connected to the left side of the reboiling structure. The interior of the preheating structure is used in conjunction with the surface of the reboiling structure. The top of the reboiling structure is provided with a uniform distribution structure for steam distribution. The surface of the uniform distribution structure is fixedly connected to the inner wall of the shell (1). The top of the uniform distribution structure is provided with a cooling structure for steam cooling. The surface of the cooling structure is provided with a cleaning structure for water removal. The top of the outer shell (1) is fixedly connected to an exhaust pipe (2) for discharging carbon dioxide.

2. The carbon dioxide purification device for flue gas according to claim 1, characterized in that: The reboiling structure includes two first sealing plates (3), which are arranged vertically. The surfaces of the first sealing plates (3) are fixedly connected to the inner wall of the outer shell (1). First partitions (4) are fixedly connected to both sides between the two first sealing plates (3). The front and rear sides of the first partitions (4) are fixedly connected to the inner wall of the outer shell (1). A first tube bundle (5) is arranged between the opposite sides of the two first partitions (4). Both sides of the first tube bundle (5) penetrate the first partitions (4) and extend to one side of the first partitions (4). A first inlet pipe (6) for hot water to enter is arranged on the right side of the right first partition (4). The right side of the first inlet pipe (6) penetrates the outer shell (1) and extends to the right side of the outer shell (1). A first outlet pipe (7) for hot water to exit is arranged on the left side of the left first partition (4). The left side of the first outlet pipe (7) penetrates the outer shell (1) and extends to the outer shell (1). On the left side of the shell (1), a first water pump (8) is fixedly connected to the bottom of the inner wall of the shell (1). The input end of the first water pump (8) is fixedly connected to a first conduit (9). The left side of the first conduit (9) passes through the shell (1) and extends to the left side of the shell (1). The output end of the first water pump (8) is fixedly connected to a second conduit (10). The top of the second conduit (10) passes through the bottom first sealing plate (3) and extends to the bottom of the first tube bundle (5). The inside of the top first sealing plate (3) is fixedly connected to a third conduit (11) for the discharge of lean liquid and steam. The bottom of the first tube bundle (5) is provided with a dispersion structure for the dispersion of rich liquid. A first cavity is formed between the first sealing plate (3), the first partition (4), the shell (1) and the first tube bundle (5). The first tube bundle (5) contains saturated water vapor. The right side of the preheating structure is fixedly connected to the first partition (4) of the shell (1).

3. The carbon dioxide purification device for flue gas according to claim 2, characterized in that: The dispersion structure includes a first motor (12), the bottom of the first motor (12) is fixedly connected to the bottom of the inner wall of the shell, the output end of the first motor (12) passes through the first sealing plate (3) and is fixedly connected to a turntable (13), and a dispersion plate (14) for dispersing the rich liquid is fixedly connected to the surface of the turntable (13).

4. The carbon dioxide purification device for flue gas according to claim 2, characterized in that: The circulation structure includes a connecting pipe (15) for draining the poor solution. The connecting pipe (15) is located on top of the first sealing plate (3). The right side of the connecting pipe (15) is fixedly connected to the left side of the outer shell (1). The left side of the connecting pipe (15) is fixedly connected to a fourth conduit (16). The other end of the fourth conduit (16) is fixedly connected to a storage tank (17). A second water pump (18) is provided on the rear side of the storage tank (17). The input end of the second water pump (18) is fixedly connected to a fifth conduit (19). The front side of the fifth conduit (19) is fixedly connected to the bottom of the rear side of the storage tank (17).

5. The carbon dioxide purification device for flue gas according to claim 4, characterized in that: The inner wall of the storage tank (17) is fixedly connected to a filter plate (20) for filtering impurities. The filter plate (20) is concave in the middle and inclined on both sides. The rear side of the storage tank (17) is fixedly connected to a discharge pipe (21) for discharging impurities from the top of the filter plate (20). A liquid level pipe (22) for liquid level display is provided on the right side of the top first sealing plate (3).

6. The carbon dioxide purification device for flue gas according to claim 2, characterized in that: The preheating structure includes a coil (23) that is fixedly connected to the first water outlet pipe (7). The coil (23) is distributed in a ring on the surface of the first conduit (9). A hollow shell (24) is fitted on the surface of the coil (23). The interior of the hollow shell (24) is fixedly connected to the surface of the first conduit (9). A water supply pipe (25) is fixedly connected to the top of the hollow shell (24).

7. The carbon dioxide purification device for flue gas according to claim 2, characterized in that: The uniformly distributed structure includes multiple layers of partitions. The partitions are set on the top of the first sealing plate (3). The partitions include partition plates (26). Both ends of the partition plates (26) are fixedly connected to the inner wall of the outer shell (1). The bottom sides of the partition plates (26) are set with arc-shaped edges. There are several partition plates (26) and they are evenly distributed. The multiple layers of partitions are spirally distributed, and the misalignment angle between the upper and lower layers is 45 degrees.

8. The carbon dioxide purification device for flue gas according to claim 1, characterized in that: The cooling structure includes a connecting frame (27) for air circulation. The connecting frame (27) is located on top of the uniformly distributed structure. A second sealing plate (28) is fixedly connected to the top and bottom of the surface of the connecting frame (27). The surface of the second sealing plate (28) is fixedly connected to the inner wall of the outer shell (1). A second tube bundle (29) is provided inside the connecting frame (27). Both ends of the second tube bundle (29) pass through the connecting frame (27) and are fixedly connected to a dispersion box (30). The right side of the dispersion box (30) is fixed. A second water inlet pipe (31) is connected to the left side of the outer shell (1), and the right side of the second water inlet pipe (31) passes through the outer shell (1) and extends to the right side of the outer shell (1). A second water outlet pipe (32) is fixedly connected to the left side of the left dispersion box (30), and the left side of the second water outlet pipe (32) passes through the outer shell (1) and extends to the left side of the outer shell (1). There are several second tube bundles (29), which are staggered. A second cavity is formed between the connecting frame (27) and the second tube bundle (29). The second tube bundle (29) contains cold air.

9. The carbon dioxide purification device for flue gas according to claim 8, characterized in that: The cleaning structure includes a second motor (33), which is located on the top right side of the outer casing (1). A fixing frame (34) is fixedly connected to the surface of the second motor (33). The left side of the fixing frame (34) is fixedly connected to the surface of the outer casing (1). The output end of the second motor (33) extends into the interior of the outer casing (1) and is fixedly connected to a screw (35). A threaded sleeve (36) is threaded onto the surface of the screw (35). A movable plate (37) is fixedly connected to the surface of the threaded sleeve (36). The interior of the movable plate (37) is used in conjunction with the surface of the second tube bundle (29). A flexible scraper (38) for removing water from the surface of the second tube bundle (29) is provided between the interior of the movable plate (37) and the second tube bundle (29).

10. A control method for a carbon dioxide purification device in flue gas according to any one of claims 1-9, characterized in that: The control method includes the following steps: Step S1: Connect the inlet and outlet of the external boiler through the first inlet pipe (6) and the first outlet pipe (7), and connect the rich liquid pipe at the bottom of the absorption tower through the first conduit (9). Start the first water pump (8), and the first water pump (8) will draw out the rich liquid at the bottom of the absorption tower through the first conduit (9) and the rich liquid pipe, and input it into the interior of the first cavity through the second conduit (10), and disperse it evenly through the dispersion structure. Step S2: Under the heating of saturated water vapor at 100 to 120 degrees Celsius in the first tube bundle (5), the rich liquid in the first cavity reacts in reverse. Carbon dioxide is desorbed from the rich liquid, and the rich liquid is decomposed into lean liquid and steam and pushed upward. The lean liquid falls onto the top first sealing plate (3) through the third conduit (11), and after being filtered by the circulation structure, it is fed into the absorption tower for reuse. The steam moves upward. Step S3: The steam is dispersed through a uniformly distributed structure; Step S4: The dispersed steam passes through the second cavity and comes into contact with the surface of the second tube bundle (29). The steam is cooled and turns into water droplets and carbon dioxide. The water droplets form on the surface of the second tube bundle (29). The water droplets fall down after being cleaned by the cleaning structure, and the carbon dioxide is discharged upward through the discharge pipe (2) for use.

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