Flue gas scrubbing system

Abstract

This application discloses a flue gas scrubbing system comprising: a scrubbing device having a scrubbing chamber, and a flue gas inlet and a flue gas outlet connected to the scrubbing chamber; a flue gas input pipeline comprising adjacent bent pipe sections and extended pipe sections, the bent pipe sections connected to the flue gas inlet, the flue gas input pipeline being used to input flue gas into the scrubbing chamber; and at least one set of spray assemblies disposed within the scrubbing chamber to provide scrubbing liquid to the scrubbing chamber for scrubbing the flue gas. The flue gas scrubbing system of this application can prevent the problem of scrubbing liquid dripping into the flue gas input pipeline.

Description

Technical Field

[0001] The present application relates to the technical field of energy conservation and environmental protection, and in particular to a flue gas scrubbing system. Background Art

[0002] Marine scrubbers are generally categorized as U-type or I-type based on the direction in which the exhaust gas from the ship's diesel engine enters the desulfurization tower. In a U-type desulfurization tower, the flue gas enters the desulfurization tower through an inlet pipe on the side and is discharged through an exhaust port at the top of the desulfurization tower. In this case, the flue gas flow pattern resembles a U-shape. In an I-type desulfurization tower, the flue gas enters through an inlet at the bottom of the desulfurization tower and is discharged through an exhaust port at the top of the desulfurization tower. In this case, the flue gas flow pattern resembles an I-shape.

[0003] Among them, the conventional U-type desulfurization tower uses packing in the main tower body as the main contact reaction area for spraying slurry and exhaust gas. However, due to the corrugated structural characteristics of the packing orifice plate, after the Mg(OH)2 slurry is sprayed on the packing, the internal suspended particles will continue to accumulate on the surface of the packing, gradually causing the packing orifice plate corrugated structure to be clogged, reducing the contact area of ​​the reaction, resulting in problems such as packing liquid flooding and excessive exhaust gas pressure difference before and after the packing unit. As a result, the pressure drop of the desulfurization system exceeds the allowable range of the diesel engine, which has an adverse effect on the service life of the diesel engine.

[0004] Conventional Type I desulfurization towers are equipped with multi-layer spray devices, allowing the flue gas to pass through the liquid film formed by the spray slurry, completing the reaction between the spray slurry and the flue gas. However, conventional Type I desulfurization towers have the following two disadvantages: The air inlet of the Type I tower is located at the bottom of the tower, and the scrubbing liquid falls from above. Although the Type I desulfurization tower is equipped with a water retaining structure, the scrubbing liquid falling from a high position will collide with the multiple structures and splash. In addition, the swaying of the ship during navigation may cause the scrubbing liquid to fall into the air inlet, causing serious damage to the diesel engine.

[0005] Therefore, it is urgent to design a flue gas scrubbing system to solve the above problems. Summary of the Invention

[0006] The present application provides a flue gas scrubbing system to prevent the problem of scrubbing liquid falling into the flue gas input pipeline.

[0007] To achieve the above objectives, on the one hand, the present application provides a flue gas scrubbing system, comprising:

[0008] A washing device having a washing chamber, and a smoke inlet and a smoke outlet connected to the washing chamber;

[0009] a smoke input pipeline, comprising adjacent bent pipe sections and extended pipe sections, wherein the bent pipe sections are connected to the smoke inlet, and the smoke input pipeline is used to input smoke into the washing chamber; and

[0010] At least one group of spraying components is arranged in the washing chamber to provide washing liquid for washing the flue gas into the washing chamber.

[0011] Optionally, in some embodiments of the present application, the washing device has a top, a bottom, and side walls for enclosing the washing chamber, and the side walls are connected to the top and the bottom;

[0012] The fume outlet is arranged on the top of the washing device, and the fume inlet is arranged on the side wall of the washing device.

[0013] Optionally, in some embodiments of the present application, the extension direction of the extension pipe section is substantially parallel to the flue gas flow direction in the washing chamber, so that the washing chamber and the flue gas input pipeline form a U-shaped flue gas flow path.

[0014] Optionally, in some embodiments of the present application, a coolant inlet and a vent are provided on the extension pipe section;

[0015] Along the flue gas flow direction, the vent is located downstream of the coolant inlet.

[0016] Optionally, in some embodiments of the present application, the spray assemblies are in multiple groups, and the multiple groups of spray assemblies are arranged at intervals along the flow direction of the smoke.

[0017] Optionally, in some embodiments of the present application, the washing device is provided with at least one drain port connected to the washing chamber, and the washing liquid in the washing chamber flows out of the washing chamber through the drain port.

[0018] Optionally, in some embodiments of the present application, a water separation component is provided in the washing chamber, and the water separation component is located between the smoke inlet and the smoke outlet along the smoke flow direction;

[0019] The spray components are divided into multiple groups, and the multiple groups of spray components include a first spray component and a second spray component; along the direction of smoke flow, the first spray component is located between the water separation component and the smoke inlet, and the second spray component is located between the water separation component and the smoke outlet.

[0020] Optionally, in some embodiments of the present application, the washing device is provided with a plurality of spray assembly inspection ports, and the plurality of spray assembly inspection ports are all connected to the washing chamber, wherein a part of the spray assembly inspection ports are upstream of the water diversion component along the direction of the flue gas flow, and another part of the spray assembly inspection ports are downstream of the water diversion component along the direction of the flue gas flow.

[0021] Optionally, in some embodiments of the present application, a water retaining assembly is provided in the washing chamber, and the water retaining assembly is provided downstream of the water diversion assembly along the flue gas flow direction and upstream of the flue gas outlet.

[0022] Optionally, in some embodiments of the present application, the washing device is provided with a first drain port and a second drain port communicating with the washing chamber, wherein:

[0023] The first drain port is provided at the bottom of the washing device and communicates with the washing chamber, and the washing liquid sprayed by the first spray assembly is discharged from the washing chamber through the first drain port;

[0024] The second liquid drain port is provided on a side wall of the washing device and communicates with the washing chamber. The washing liquid sprayed by the second spray assembly is discharged from the washing chamber via the second liquid drain port.

[0025] Optionally, in some embodiments of the present application, a plurality of liquid level alarms are provided in the washing chamber.

[0026] Optionally, in some embodiments of the present application, at least one demister is provided in the washing chamber, and the demister is located between the spray assembly and the smoke outlet along the smoke flow direction.

[0027] Optionally, in some embodiments of the present application, the scrubbing device further comprises a demister inspection port communicating with the scrubbing chamber, and the demister inspection port is located between the demister and the flue gas outlet along the flue gas flow direction.

[0028] Optionally, in some embodiments of the present application, at least one flushing component is provided in the washing chamber, and the flushing component is located on a side of the demister close to the flue gas outlet for flushing the demister.

[0029] Compared with the prior art, the flue gas scrubbing system described in the present application includes a scrubbing device having a scrubbing chamber, a flue gas inlet and a flue gas outlet, a flue gas input pipeline and a spray assembly. The flue gas input pipeline includes adjacent bent pipe sections and extended pipe sections, and the bent pipe sections are connected to the flue gas inlet. The spray assembly is arranged in the scrubbing chamber to provide scrubbing liquid to the scrubbing chamber. The flue gas scrubbing system described in the present application can use a spray layer as a reaction zone between the scrubbing liquid and the flue gas, and does not set a filler in the scrubbing chamber, so that the problem of filler clogging will not occur; and, by utilizing the bent pipe section to be connected to the flue gas inlet, the flow path of the flue gas through the flue gas input pipeline is U-shaped, which prevents the scrubbing liquid from flowing into the flue gas input pipeline, thereby preventing the scrubbing liquid from causing serious damage to the diesel engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 Schematic diagram of a flue gas scrubbing system provided according to an embodiment of the present application.

[0032] The main reference numerals in the drawings of this application specification are described as follows:

[0033] 100-Flue gas washing system; 10-Washing device; 11-Top; 12-Bottom; 13-Side wall; 101-Washing chamber; 102-Flue gas inlet; 103-Flue gas outlet; 104-First drain port; 105-Second drain port; 106-First spray assembly inspection port; 107-Second spray assembly inspection port; 108-Defogger inspection port; 20-Flue gas input pipeline; 21-Bent pipe section; 22-Extended pipe section; 201-Coolant inlet; 202-Ventilation port; 30-Spray assembly; 31-First spray assembly; 32-Second spray assembly; 40-Water distribution assembly; 50-Water retaining assembly; 60-Defogger; 70-Flushing assembly; 80-Liquid level alarm; 81-First liquid level alarm; 82-Second liquid level alarm. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0035] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 cannot be understood as a limitation on this application.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0037] In the description of this application, 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; they can refer to mechanical connections, direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0038] like Figure 1 As shown, the present application provides a flue gas scrubbing system 100, which includes a scrubbing device 10, a flue gas input pipeline 20, and a spray assembly 30. The scrubbing device 10 has a scrubbing chamber 101, a flue gas inlet 102, and a flue gas outlet 103, wherein the flue gas inlet 102 and the flue gas outlet 103 are respectively connected to the scrubbing chamber 101. The flue gas input pipeline 20 includes a bent pipe section 21 and an extended pipe section 22, wherein the bent pipe section 21 is connected to the flue gas inlet 102. The spray assembly 30 is disposed in the scrubbing chamber 101 to provide scrubbing liquid to the scrubbing chamber 101.

[0039] Compared to existing technical solutions, the flue gas scrubbing system 100 of the present application, by installing the spray assembly 30 within the scrubbing chamber 101, can utilize a spray layer as the reaction zone between the scrubbing liquid and the flue gas. No filler is provided in the scrubbing chamber 101, thus preventing the problem of filler clogging. Furthermore, since no filler is provided in the scrubbing chamber 101, the flue gas flow rate is increased, and the diameter of the scrubbing chamber 101 can be set smaller, significantly saving layout space. Furthermore, by configuring the flue gas input pipeline 20 as a contiguous curved pipe section 21 and an extended pipe section 22, and utilizing the curved pipe section 21 to connect to the flue gas inlet 102, the flow path of the flue gas through the flue gas input pipeline 20 is U-shaped, preventing the scrubbing liquid from flowing into the flue gas input pipeline 20, thereby preventing the scrubbing liquid from causing serious damage to the diesel engine.

[0040] In a specific implementation, the flue gas scrubbing system of the present application is configured as a marine desulfurization system. In this case, the scrubbing device 10 is configured as a U-shaped scrubbing tower based on a magnesium-based method.

[0041] In some embodiments, the washing apparatus 10 comprises a top 11, a bottom 12, and a sidewall 13 for enclosing the washing chamber 101, wherein the sidewall 13 is connected to the top 11 and the bottom 12. In other words, the sidewall 13 is located between the top 11 and the bottom 12 and is connected to the top 11 and the bottom 12 to enclose and form the washing chamber 101.

[0042] Based on the above embodiment, the fume outlet 103 is located at the top 11 of the scrubbing device 10, and the fume inlet 102 is located on the sidewall 13 of the scrubbing device 10. In a specific implementation, the scrubbing chamber 101 may be a cylindrical cavity or a prismatic cavity. It should be noted that this application does not impose any specific limitations on the specific implementation of the scrubbing chamber 101.

[0043] Furthermore, when viewed from a vertical direction, the top 11 , the side wall 13 and the bottom 12 are arranged in sequence.

[0044] Furthermore, to facilitate the collection of scrubbing liquid and the discharge of smoke, the inner diameter of the top 11 is gradually reduced, while the inner diameter of the bottom 12 is gradually expanded in the vertical direction from the top 11 to the bottom 12. The top 11 and the bottom 12 are respectively connected to the side wall 13 through the large diameter end.

[0045] In some embodiments, to drain the washing liquid from the washing chamber 101, the washing device 10 is provided with at least one drain port connected to the washing chamber 101. The washing liquid in the washing chamber 101 is discharged from the washing chamber 101 via the drain port. It is understood that there may be one or more drain ports. In a specific implementation, the drain port is provided on the bottom 12 or the side wall 13.

[0046] Specifically in this embodiment, both the top portion 11 and the bottom portion 12 have funnel-shaped structures. The top portion 11 communicates with the side wall 13 via its large-diameter end, with its small-diameter end serving as the smoke outlet 103. The bottom portion 12 communicates with the side wall 13 via its large-diameter end, with its small-diameter end serving as one of the liquid drain ports. The small-diameter end of the bottom portion 12 serves as the first liquid drain port 104. When viewed vertically, the first liquid drain port 104 is positioned opposite the smoke outlet 103.

[0047] In some embodiments, the extension direction of the extension pipe section 22 is substantially parallel to the extension direction of the washing chamber 101 , so that the washing chamber 101 and the smoke input pipeline 20 form a U-shaped smoke flow path.

[0048] In a specific implementation, the end of the extended pipe section 22 away from the bent pipe section 21 is configured as the air inlet of the flue gas input pipeline 20, and the end of the bent pipe section 21 away from the extended pipe section 22 is configured as the air outlet of the flue gas input pipeline 20. In a specific implementation, the air inlet of the flue gas input pipeline 20 is used to connect to the exhaust port of the ship engine, and the air outlet of the flue gas input pipeline 20 is connected to the flue gas inlet 102.

[0049] In this embodiment, the extension pipe section 22 extends in a vertical direction. At this time, the flue gas flows vertically downward in the flue gas input pipe 20. The flue gas flows vertically upward in the washing chamber 101, and vertically downward in the flue gas input pipe 20.

[0050] In some embodiments, along the flue gas flow direction, a coolant inlet 201 and a vent 202 are sequentially provided on the extension pipe section 22. The coolant inlet 201 is used to input coolant into the flue gas input pipeline 20 to cool the flue gas.

[0051] When desulfurizing flue gas (also known as tail gas or waste gas), the flue gas first enters the flue gas input pipeline 20 through the air inlet of the flue gas input pipeline 20. At this time, the coolant entering from the coolant inlet 201 will be sprayed into the flue gas input pipeline 20, playing a role in cooling the gas and reducing the gas temperature to below 60°C. The coolant will flow into the washing chamber 101 through the bent pipe section 21 and be discharged from the drain port; the flue gas continues to flow downward and enters the inside of the washing chamber 101 through the bent pipe section 21.

[0052] In practice, because the extended pipe section 22 cools the flue gas entering the flue gas input pipeline 20 to below 60°C, the bent pipe section 21 can be made of less expensive super-duplex stainless steel, eliminating the need for super-austenitic stainless steel. Furthermore, no scalding or heat preservation measures are required starting from the bent pipe section 21. This reduces the manufacturing cost of the flue gas scrubbing system 100.

[0053] In some embodiments, the spray assembly 30 is provided in multiple groups, and the multiple groups of spray assemblies 30 are spaced apart in the direction of smoke flow within the washing chamber 101, and the multiple groups of spray assemblies 30 are all located between the smoke inlet 102 and the smoke outlet 103. During use, the cleaning liquid sprayed by the spray assembly 30 and the smoke flowing through the spray assembly 30 interact to form a liquid film (i.e., a spray layer), and the smoke and the liquid film (i.e., the spray layer) contact and react to achieve the purpose of washing.

[0054] More specifically, a plurality of groups of the spray assemblies 30 are vertically spaced apart in the washing chamber 101 , so that the smoke flowing into the washing chamber 101 through the smoke inlet 102 is washed by the plurality of groups of the spray assemblies 30 and then flows out through the smoke outlet 103 .

[0055] Furthermore, multiple groups of the spray assemblies 30 are staggeredly arranged along the circumference of the washing chamber 101. This arrangement ensures that the flue gas is fully washed.

[0056] Furthermore, the plurality of spray assemblies 30 may use the same or different cleaning liquids, which is not specifically limited in this application. Preferably, the spray assemblies 30 use Mg(OH)2 solution as the cleaning liquid.

[0057] In some embodiments, a water diversion assembly 40 is provided within the washing chamber 101 and is positioned between the smoke inlet 102 and the smoke outlet 103 along the direction of smoke flow. In this case, the multiple spray assemblies 30 include a first spray assembly 31 and a second spray assembly 32; along the direction of smoke flow, the first spray assembly 31 is positioned between the water diversion assembly 40 and the smoke inlet 102, and the second spray assembly 32 is positioned between the water diversion assembly 40 and the smoke outlet 103.

[0058] At this time, the scrubbing chamber 101 is divided into a preliminary scrubbing section and a fine scrubbing section. The preliminary scrubbing section is located between the water diversion assembly 40 and the flue gas inlet 102, while the fine scrubbing section is located between the water diversion assembly 40 and the flue gas outlet 103. In this embodiment, the preliminary scrubbing section is equipped with one set of the first spray assemblies 31, and the fine scrubbing section is equipped with four sets of the second spray assemblies 32.

[0059] Specifically in the embodiment of the present application, a plurality of groups of the spray assemblies 30 are arranged at intervals along the extension direction of the side wall 13 and are fixedly installed on the inner surface of the side wall 13 .

[0060] Specifically, the water diversion assembly 40 is funnel-shaped or trumpet-shaped. Its large-diameter end faces the first drain port 104 and is fixed to the inner surface of the sidewall 13. Its small-diameter end faces the flue gas outlet 103. In practice, the large-diameter end of the water diversion assembly 40 is located below the second drain port 105. The cleaning liquid sprayed by the second spray assembly 32 completes the cleaning reaction, ensuring that it lands on the water diversion assembly 40 before being discharged through the second drain port 105.

[0061] In some embodiments, a water retaining assembly 50 is provided in the washing chamber 101 . The water retaining assembly 50 is provided downstream of the water diversion assembly 40 and upstream of the smoke outlet 103 along the smoke flow direction.

[0062] When the flue gas passes through the water retaining assembly 50, it will be impacted by the diversion of the water retaining assembly 50. The water retaining assembly 50 will guide the flue gas toward the nozzle of the second spraying assembly 32, thereby achieving the functions of diversion and equalization, thereby making the contact reaction between the flue gas and the washing liquid sprayed by the second spraying assembly 32 more complete, thereby improving the desulfurization effect.

[0063] Further reference to the specific implementation of the second spray assembly 32 reveals that the multiple sets of second spray assemblies 32 include the lowest second spray assembly 32 closest to the water diversion assembly 40 (i.e., the second spray assembly 32 at the bottom of the fine washing section). In practice, placing the water retaining assembly 50 at the same height as the second spray assembly 32 at the bottom of the fine washing section can significantly reduce the height requirements of the washing chamber 101 and save costs.

[0064] Furthermore, the scrubbing device 10 is provided with a plurality of spray assembly inspection ports, all of which are connected to the scrubbing chamber. Some of the spray assembly inspection ports are located upstream of the water diversion assembly along the direction of flue gas flow, while others are located downstream of the water diversion assembly along the direction of flue gas flow. More specifically, the scrubbing device 10 is provided with two spray assembly inspection ports, namely a first spray assembly inspection port 106 and a second spray assembly inspection port 107. The first spray assembly inspection port 106 is located upstream of the water diversion assembly 40 along the direction of flue gas flow and allows for inspection of the first spray assembly 31. The second spray assembly inspection port 107 is located downstream of the water diversion assembly 40 along the direction of flue gas flow and allows for inspection of the second spray assembly 32.

[0065] In some embodiments, the scrubbing device 10 is provided with a first drain port 104 and a second drain port 105 that communicate with the scrubbing chamber 101. The first drain port 104 is located at the bottom 12 of the scrubbing device 10 and communicates with the scrubbing chamber 101. The scrubbing liquid sprayed by the first spray assembly 31 is discharged from the scrubbing chamber 101 through the first drain port 104 after scrubbing the flue gas. The second drain port 105 is located at the side wall 13 of the scrubbing device 10 and communicates with the scrubbing chamber 101. The scrubbing liquid sprayed by the second spray assembly 32 is discharged from the scrubbing chamber 101 through the second drain port 105 after scrubbing the flue gas.

[0066] In a specific implementation, the washing device 10 is provided with a plurality of the second liquid drain ports 105 , and the plurality of the second liquid drain ports 105 are arranged at intervals along the circumference of the washing chamber 101 .

[0067] In some embodiments, the washing chamber 101 is provided with a plurality of liquid level alarms 80, which are arranged between the first liquid drain port and the flue gas inlet 102. The liquid level alarms 80 can detect the liquid level in the washing chamber 101, thereby preventing the liquid level in the washing chamber 101 from being too high or too low. This can prevent the washing liquid from flowing back into the flue gas input pipeline 20 due to the excessively high liquid level, and can also prevent the outside air from entering the washing chamber 101 through the first liquid drain port 104.

[0068] Specifically in this embodiment, the liquid level alarm 80 includes a first liquid level alarm 81 and a second liquid level alarm 82. The first liquid level alarm 81 is closer to the first drain port 104 than the second liquid level alarm 82. In this case, the first liquid level alarm 81 is a low liquid level alarm, while the second liquid level alarm 82 is a high liquid level alarm.

[0069] In some embodiments, at least one demister 60 is provided in the scrubbing chamber 101 and is located between the spray assembly 30 and the smoke outlet 103 along the smoke flow direction. The demister 60 can remove water vapor from the smoke, thereby improving the smoke scrubbing effect.

[0070] In some embodiments, the washing device 10 further has a demister inspection port 108 communicating with the washing chamber 101 , and the demister inspection port 108 is used for inspecting the demister 60 .

[0071] Specifically, the demister inspection opening 108 is located between the demister 60 and the flue gas outlet 103 along the flue gas flow direction. In addition, the demister inspection opening 108 can expose the demister 60.

[0072] In some embodiments, at least one flushing assembly 70 is provided in the washing chamber 101. The flushing assembly 70 is located on the side of the demister 60 near the air outlet and is used to spray a flushing liquid onto the demister 60 to flush the demister 60. This arrangement can improve the working effect and performance of the demister 60.

[0073] Based on the above-described embodiment of the scrubbing device 10, the demister 60 is mounted on an end of the side wall 13 close to the top 11 (i.e., the top of the side wall 13), and the demister access port 108 is opened on the top 11 and located outside the flue gas outlet 103. The flushing assembly 70 is disposed on an end of the top 11 facing the side wall 13 (i.e., the large-diameter end of the top 11).

[0074] In a specific implementation, the demister 60 , the flushing assembly 70 and the demister inspection port 108 are sequentially arranged along the flue gas flow direction. Furthermore, the nozzle of the flushing assembly 70 is disposed toward the demister 60 .

[0075] The specific working process of the flue gas scrubbing system 100 of the present application is as follows: after the flue gas enters the scrubbing chamber 101 through the flue gas input pipeline 20, it flows upward at a very high speed. The flue gas first passes through the first spray assembly 31 of the preliminary scrubbing section. The flue gas and the scrubbing liquid sprayed by the first spray assembly 31 work together to form a liquid film (spray layer). The flue gas and the scrubbing liquid contact and react to complete the preliminary scrubbing. Then, the scrubbing liquid sprayed by the first spray assembly 31 reacts and is discharged from the first drain port 104. The flue gas flows to the fine scrubbing section through the water distribution assembly 40 and then rushes to the The water retaining assembly 50, through the diversion and flow equalization function of the water retaining assembly 50, the flue gas flows upward from all around the water retaining assembly 50. When passing through the fine washing section, the flue gas and the washing liquid sprayed by the second spray assembly 32 work together to form a multi-layer liquid film (spray layer). The flue gas and the washing liquid in the liquid film fully contact and react to complete the fine washing; the washing liquid sprayed by the second spray assembly 32 of the fine washing section passes through the water diversion assembly 40 and is discharged from the second liquid drain port 105. Then the flue gas passes through the demister 60 to filter out the small droplets suspended in the flue gas, and is discharged into the air through the flue gas outlet 103.

[0076] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0077] The above is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims. In addition, the specification uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. The content of this specification should not be understood as limiting the present application.

Claims

1. A flue gas scrubbing system, characterized in that: include: A washing device having a washing chamber, and a smoke inlet and a smoke outlet connected to the washing chamber; A water diversion assembly is provided in the washing chamber, and the water diversion assembly is located between the smoke inlet and the smoke outlet along the direction of smoke flow. The washing device is provided with a first drain port and a second drain port connected to the washing chamber, the first drain port is opened at the bottom of the washing device and connected to the washing chamber, and the water diversion assembly is funnel-shaped or trumpet-shaped as a whole, the large-diameter end of the water diversion assembly is arranged toward the first drain port and fixed on the inner surface of the side wall of the washing device, and the small end of the water diversion assembly is arranged toward the smoke outlet; a water retaining assembly is provided in the washing chamber, and the water retaining assembly is arranged downstream of the water diversion assembly along the direction of smoke flow and upstream of the smoke outlet; a smoke input pipeline, comprising adjacent bent pipe sections and extended pipe sections, wherein the bent pipe sections are connected to the smoke inlet, and the smoke input pipeline is used to input smoke into the washing chamber; as well as, Multiple groups of spray assemblies are arranged in the washing chamber to provide washing liquid for washing the flue gas into the washing chamber; the multiple groups of spray assemblies include a first spray assembly and a second spray assembly; along the direction of flue gas flow, the first spray assembly is located between the water separation assembly and the flue gas inlet, and the second spray assembly is located between the water separation assembly and the flue gas outlet, and the washing liquid sprayed by the first spray assembly is discharged from the washing chamber through the first drain port; The smoke passes through the water diversion assembly and rushes toward the water retaining assembly. When the smoke passes through the water retaining assembly, it passes through the diversion of the water retaining assembly and flows upward from all sides of the water retaining assembly to guide the smoke toward the nozzle of the second spray assembly.

2. The flue gas scrubbing system according to claim 1, characterized in that: The washing device has a top, a bottom and a side wall for enclosing the washing chamber, and the side wall is connected to the top and the bottom; The fume outlet is arranged on the top of the washing device, and the fume inlet is arranged on the side wall of the washing device.

3. The flue gas scrubbing system according to claim 1, characterized in that: The extending direction of the extending pipe section is substantially parallel to the flue gas flow direction in the washing chamber, so that the washing chamber and the flue gas input pipeline form a U-shaped flue gas flow path.

4. The flue gas scrubbing system according to claim 1, characterized in that: The extended pipe section is provided with a coolant inlet and a vent; Along the flue gas flow direction, the vent is located downstream of the coolant inlet.

5. The flue gas scrubbing system according to claim 1, characterized in that: The spray components are divided into multiple groups, and the multiple groups of spray components are arranged at intervals along the flow direction of the smoke.

6. The flue gas scrubbing system according to claim 1, characterized in that: The washing device is provided with at least one drain port communicating with the washing chamber, and the washing liquid in the washing chamber flows out of the washing chamber through the drain port.

7. The flue gas scrubbing system according to claim 1, characterized in that: The washing device is provided with a plurality of spray assembly inspection ports, and the plurality of spray assembly inspection ports are all connected to the washing chamber, wherein a part of the spray assembly inspection ports are upstream of the water distribution component along the direction of the flue gas flow, and another part of the spray assembly inspection ports are downstream of the water distribution component along the direction of the flue gas flow.

8. The flue gas scrubbing system according to claim 1, characterized in that: The second liquid drain port is provided on a side wall of the washing device and communicates with the washing chamber. The washing liquid sprayed by the second spray assembly is discharged from the washing chamber via the second liquid drain port.

9. The flue gas scrubbing system according to claim 1, characterized in that: A plurality of liquid level alarms are arranged in the washing chamber.

10. The flue gas scrubbing system according to claim 1, characterized in that: At least one demister is provided in the washing chamber, and the demister is located between the spray assembly and the smoke outlet along the smoke flow direction.

11. The flue gas scrubbing system according to claim 10, characterized in that: The washing device further comprises a demister inspection port communicated with the washing chamber, and the demister inspection port is located between the demister and the flue gas outlet along the flue gas flow direction.

12. The flue gas scrubbing system according to claim 10, characterized in that: At least one flushing component is provided in the washing chamber. The flushing component is located on a side of the demister close to the smoke outlet and is used for flushing the demister.

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