Energy-efficient flue gas desulfurization purification device

Abstract

This invention discloses a high-efficiency and energy-saving flue gas desulfurization and purification device, comprising a desulfurization tower, spray branches, and return water branches. A storage tank is located at the bottom of the desulfurization tower. A flue gas inlet is located on the side wall above the storage tank, and the desulfurization tower also has a flue gas outlet. A demister is located below the flue gas outlet within the desulfurization tower. Multiple spray layers are arranged between the flue gas inlet and the demister within the desulfurization tower. A circulating water recovery layer is provided between adjacent spray layers. Each spray layer contains a sprayer, and each sprayer is connected to the storage tank via a spray branch. Each circulating water recovery layer contains a water collection and exhaust component, and each water collection and exhaust component is connected to the storage tank via a return water branch. The flue gas desulfurization and purification device of this invention features low system resistance, low power consumption of the circulating pump, simple installation, and space saving.

Description

Technical Field

[0001] This invention belongs to the technical field of flue gas purification devices, and specifically relates to a high-efficiency and energy-saving flue gas desulfurization and purification device. Background Technology

[0002] Among the many flue gas desulfurization technologies in my country, wet limestone-gypsum flue gas desulfurization (FGD) is the most widely used.

[0003] Flue gas desulfurization (FGD) is the primary technology for controlling acid rain and sulfur dioxide pollution. FGD technology mainly utilizes various alkaline absorbents or adsorbents to capture sulfur dioxide in flue gas, converting it into more stable and easily mechanically separable sulfur compounds or elemental sulfur, thereby achieving desulfurization. FGD methods can be divided into two categories based on the water content of the desulfurizing agent and the desulfurization products:

[0004] 1. Wet method: This method uses liquid absorbents such as water or alkaline solutions (or slurries) to wash away sulfur dioxide.

[0005] 2. Dry method: This method uses powdered or granular absorbents, adsorbents, or catalysts to remove sulfur dioxide. It can be divided into recovery methods and disposal methods based on whether the desulfurization products are reused. According to the treatment method of the absorbent after absorbing sulfur dioxide, it can be divided into regeneration methods and non-regeneration methods (disposal methods).

[0006] Existing wet flue gas desulfurization (FGD) systems use a circulating pump to spray a limestone powder slurry from a spray layer. Inside the desulfurization absorption tower, the slurry comes into counter-current contact with the flue gas, purifying it of various pollutants such as sulfur, nitrates, and dust. The purified flue gas is then discharged through a chimney. A drawback of existing wet FGD systems is the increasing need for higher desulfurization efficiency.

[0007] Existing FGD wet desulfurization purification devices can only improve desulfurization efficiency by increasing the number of spray layers when dealing with flue gas with high sulfur content. However, the more spray layers there are, the greater the resistance of the absorption tower and the greater the energy consumption of the desulfurization system.

[0008] In summary, when treating high-sulfur flue gas by arranging series spray towers in the existing technology, the desulfurization and purification device occupies a large area and the total investment cost of the project is relatively high. Summary of the Invention

[0009] To address the above problems, this invention provides a high-efficiency and energy-saving flue gas desulfurization and purification device, which is especially suitable for flue gas desulfurization and purification using high-sulfur coal.

[0010] A high-efficiency and energy-saving flue gas desulfurization and purification device includes a desulfurization tower, a spray branch, and a return water branch. The desulfurization tower has a storage tank at its bottom, a flue gas inlet on its upper side wall above the storage tank, a flue gas outlet, a demister below the flue gas outlet, multiple spray layers between the flue gas inlet and the demister, a circulating water recovery layer between adjacent spray layers, a sprayer in each spray layer, and each sprayer connected to the storage tank via the spray branch. Each circulating water recovery layer contains a water collection and exhaust component.

[0011] The water collection and exhaust component includes a water collection assembly and an exhaust assembly. The water collection assembly forms a water collection tank with the inner wall of the desulfurization tower. The water collection tank is connected to the liquid storage tank through the return water branch. The exhaust assembly is installed on the water collection assembly. The exhaust assembly includes an exhaust pipe that connects to an adjacent spray layer. The lower end of the exhaust pipe is sealed to the water collection tank, and the upper end of the exhaust pipe is higher than the liquid level in the water collection tank.

[0012] Furthermore, the flue gas outlet is located on the top side wall of the desulfurization tower.

[0013] Furthermore, the number of spray branches corresponds one-to-one with the number of sprayers, and each sprayer is connected to the liquid storage tank through one of the spray branches.

[0014] Furthermore, the number of return water branches corresponds one-to-one with the number of water collection and venting components, and each water collection tank is connected to the liquid storage tank through one of the return water branches.

[0015] Furthermore, the sprayer includes a spray pipe and multiple nozzles;

[0016] Multiple nozzles are evenly spaced on the spray pipe, one end of which is fixed to the inner wall of the desulfurization tower and connected to the spray branch, and the openings of the multiple nozzles face downwards.

[0017] Furthermore, the spray branch includes a pipe, a first valve, a circulation pump, and a pressure gauge;

[0018] One end of the pipeline is connected to the liquid storage tank, and the other end of the pipeline is connected to the spray pipe. The first valve, the circulating pump, and the pressure gauge are sequentially connected to the pipeline.

[0019] Furthermore, it also includes liquid drainage branches;

[0020] The liquid venting branch is located on the side wall at the bottom of the desulfurization tower, and is connected to the liquid storage tank. A second valve is installed on the liquid venting branch.

[0021] Furthermore, this also includes exhaust gas venting branch lines;

[0022] The exhaust gas vent branch is located at the top of the desulfurization tower, above the demister, and a third valve is installed on the exhaust gas vent branch.

[0023] Furthermore, the water collection assembly includes a cylinder and a sealing plate. The cylinder has openings at both the top and bottom ends, and the lower end of the cylinder is sealed to the inner wall of the desulfurization tower. The cylinder, the sealing plate, and the inner wall of the desulfurization tower form a water collection trough. Multiple exhaust components are provided on the cylinder and the sealing plate.

[0024] Furthermore, the cylinder is a conical cylinder.

[0025] Furthermore, a water-blocking structure is provided at the upper end of the exhaust pipe. The water-blocking structure is used to guide the sprayed slurry into the water collection tank and prevent the sprayed slurry from entering the exhaust pipe.

[0026] Furthermore, the water-blocking structure includes a flue cap and a support rod;

[0027] The lower end of the smoke cap is connected to the upper end of the exhaust pipe through multiple support rods, and gas passages are provided at the upper ends of the smoke cap and the exhaust pipe.

[0028] Furthermore, the smoke cap is umbrella-shaped.

[0029] The beneficial effects of the present invention are: the flue gas desulfurization and purification device of the present invention has low system resistance, low power consumption of the circulating pump, simple installation, and space saving.

[0030] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the structure of a first embodiment of a high-efficiency and energy-saving flue gas desulfurization and purification device according to the present invention is shown;

[0033] Figure 2A schematic diagram of the exhaust assembly structure according to an embodiment of the present invention is shown;

[0034] Figure 3 A schematic diagram of the structure of a second embodiment of a high-efficiency and energy-saving flue gas desulfurization and purification device according to the present invention is shown.

[0035] In the diagram: 1. Desulfurization tower; 2. Inlet flue; 3. Outlet flue; 4. Water collection and exhaust system; 5. Demister; 9. Liquid venting branch; 10. Exhaust gas venting branch; 11. Storage tank; 41. Water collection assembly; 42. Exhaust assembly; 61. First spray branch; 62. Second spray branch; 63. Third spray branch; 611. First valve; 612. Circulating pump; 613. Pressure gauge; 71. First return water branch. 72. Second return water branch; 81. First sprayer; 82. Second sprayer; 83. Third sprayer; 91. Second valve; 101. Third valve; 421. Flue cap; 422. Support rod; 423. Exhaust pipe; 811. Nozzle; 100. First spray layer; 200. First circulating water recovery layer; 300. Second spray layer; 400. Second circulating water recovery layer; 500. Third spray layer. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings.

[0038] This invention provides a high-efficiency and energy-saving flue gas desulfurization and purification device, which can significantly reduce the energy consumption of desulfurization tower 1 and achieve the desulfurization efficiency of series towers with a single tower. It has the advantages of low energy consumption, small footprint, and low operating cost, and is especially suitable for flue gas desulfurization and purification using high-sulfur coal.

[0039] Please see Figure 1 , Figure 1A schematic diagram of the structure of a first embodiment of a high-efficiency and energy-saving flue gas desulfurization and purification device according to the present invention is shown.

[0040] A high-efficiency and energy-saving flue gas desulfurization and purification device includes a desulfurization tower 1, an inlet flue 2, an outlet flue 3, a spray branch and a return water branch.

[0041] A liquid storage tank 11 is provided at the bottom of the desulfurization tower 1. A flue gas inlet is provided on the side wall above the liquid storage tank 11. The flue gas inlet is connected to the inlet flue duct 2. The raw flue gas enters the interior of the desulfurization tower 1 from the inlet flue duct 2. A flue gas outlet is provided on the top side wall of the desulfurization tower 1. The flue gas outlet is connected to the outlet flue duct 3.

[0042] A demister 5 is installed below the flue gas outlet inside the desulfurization tower 1. Multiple spray layers are arranged sequentially between the flue gas inlet and the demister 5 along the flue gas flow direction inside the desulfurization tower 1. A circulating water recovery layer is set between adjacent spray layers. A sprayer is installed in each spray layer. A water collection and exhaust component 4 is installed in each circulating water recovery layer.

[0043] In one embodiment, the number of spray branches corresponds one-to-one with the number of sprayers, and each sprayer is connected to the storage tank 11 through a spray branch. The number of return water branches corresponds one-to-one with the number of water collection and venting components 4.

[0044] The water collection and exhaust component 4 includes a water collection assembly 41 and an exhaust assembly 42. The water collection assembly 41 is sealed to the inner wall of the desulfurization tower 1, and the water collection assembly 41 and the inner wall of the desulfurization tower 1 form a water collection tank. The bottom of the water collection tank is connected to one end of the return water branch. Each water collection tank is connected to the liquid storage tank 11 through a return water branch. The exhaust assembly 42 is installed on the water collection assembly 41. One or more exhaust assemblies 42 can be installed as needed.

[0045] Please see Figure 2 , Figure 2 A schematic diagram of an exhaust assembly structure according to an embodiment of the present invention is shown.

[0046] Each exhaust assembly 42 is provided with an exhaust pipe 423 that connects to the adjacent spray layer. The lower end of the exhaust pipe 423 is sealed to the water collection tank, and the upper end of the exhaust pipe 423 is higher than the liquid level in the water collection tank. The upper end of the exhaust pipe 423 is also provided with a water-blocking structure, which is used to guide the sprayed slurry into the water collection tank and prevent the sprayed slurry from entering the exhaust pipe 423.

[0047] In one embodiment, such as Figure 1As shown, two spray layers are provided inside the desulfurization tower 1. Between the flue gas inlet and the flue gas outlet, the desulfurization tower 1 is provided with a first spray layer 100, a first circulating water recovery layer 200, a second spray layer 300, and a demister 5 in sequence along the flue gas flow direction. The raw flue gas passes through the inlet flue duct 2, the flue gas inlet of the desulfurization tower 1, the first spray layer 100, and the first circulating water recovery layer 200 in sequence, enters the upper part of the desulfurization tower 1, then passes through the second spray layer 300, the demister 5, and the flue gas outlet, and finally is discharged into the chimney through the outlet flue duct 3.

[0048] The first spray layer 100 is provided with a first sprayer 81, the first circulating water recovery layer 200 is provided with a first water collection and exhaust component 4, the second spray layer 300 is provided with a second sprayer 82, the return water branch includes a first return water branch 71, and the spray branch includes a first spray branch 61 and a second spray branch 62.

[0049] Among them, one end of the first spray branch 61 is connected to the liquid storage tank 11, and the other end of the first spray branch 61 is connected to the first sprayer 81; one end of the second spray branch 62 is connected to the liquid storage tank 11, and the other end of the second spray branch 62 is connected to the second sprayer 82; one end of the first return water branch 71 is connected to the liquid storage tank 11, and the other end of the first return water branch 71 is connected to the first water collection and exhaust component 4.

[0050] In one embodiment, the first sprayer 81 and the second sprayer 82 have the same structure. Both the first sprayer 81 and the second sprayer 82 include a spray pipe and a plurality of nozzles 811. The plurality of nozzles 811 are evenly spaced on the spray pipe. One end of the spray pipe is fixed to the inner wall of the desulfurization tower 1 and connected to the spray branch. The openings of the plurality of nozzles 811 face downward.

[0051] In one embodiment, the first spray branch 61 and the second spray branch 62 have the same structure. Both the first spray branch 61 and the second spray branch 62 include a pipe, a first valve 611, a circulating pump 612 and a pressure gauge 613. One end of the pipe is connected to the liquid storage tank 11 and the other end of the pipe is connected to the spray pipe. The first valve 611, the circulating pump 612 and the pressure gauge 613 are sequentially connected and installed on the pipe.

[0052] When maintenance is required on the circulating pump 612, the first valve 611 can be closed to prevent the slurry in the storage tank 11 from flowing out, facilitating maintenance. The pressure gauge 613 can display the water pressure in the pipeline and monitor the spray water pressure of the first spray branch 61 and the second spray branch 62 in real time. By adjusting the operating power of the circulating pump 612, the water pressure can be adjusted to meet the water pressure requirements of the water washing spray.

[0053] In this embodiment, the lower end of the exhaust pipe 423 of each exhaust component 42 is connected to the first spray layer 100, and the upper end of the exhaust pipe 423 of each exhaust component 42 is higher than the liquid level of the water collection tank and is connected to the second spray layer 300. The water-blocking structure at the upper end of each exhaust component 42 is used to guide the slurry sprayed by the second spray layer 300 into the water collection tank and prevent the slurry sprayed by the second spray layer 300 from entering the first spray layer 100, so that the first spray layer 100 is connected to the flue gas of the circulating water recovery layer, but the slurry is not connected.

[0054] In one embodiment, the water collection assembly 41 includes a cylinder and a sealing plate. The cylinder has openings at both the top and bottom ends. The sealing plate is disposed at the top end of the cylinder. The bottom end of the cylinder is sealed to the inner wall of the desulfurization tower 1. The cylinder, the sealing plate, and the inner wall of the desulfurization tower 1 form a water collection trough. Multiple exhaust assemblies 42 are respectively disposed on the cylinder and the sealing plate.

[0055] Furthermore, the cylinder has a conical structure, with its transverse cross-sectional area gradually increasing from top to bottom, and its longitudinal cross-section being trapezoidal.

[0056] In this embodiment, the conical structure of the cylinder allows the slurry sprayed by the second sprayer 82 in the second spray layer 300 to flow rapidly along the cylinder wall into the bottom of the water collection tank, resulting in high slurry collection efficiency.

[0057] In one embodiment, such as Figure 2 As shown, the water-blocking structure includes a flue cap 421 and a support rod 422. The flue cap 421 is umbrella-shaped. The lower end of the flue cap 421 is connected to the upper end of the exhaust pipe 423 through multiple support rods 422. A gas channel is left between the flue cap 421 and the upper end of the exhaust pipe 423. The lower end of the exhaust pipe 423 passes through the cylinder or sealing plate and communicates with the first spray layer 100. The upper end of the exhaust pipe 423 is higher than the liquid level in the water collection tank.

[0058] In one embodiment, the flue gas desulfurization and purification device further includes a liquid venting branch 9, which is located on the side wall at the bottom of the desulfurization tower 1 and is connected to the storage tank 11. Furthermore, a second valve 91 is provided on the liquid venting branch 9. When the desulfurization tower 1 is in normal use, the second valve 91 is normally closed. When it is necessary to repair the desulfurization tower 1 or the storage tank 11, the second valve 91 can be opened to discharge the slurry in the storage tank 11 through the liquid venting branch 9, which provides convenience for the repair work.

[0059] In one embodiment, the flue gas desulfurization and purification device further includes a waste gas exhaust branch 10, which is located at the top of the desulfurization tower 1, above the demister 5. Furthermore, a third valve 101 is provided on the waste gas exhaust branch 10. When the desulfurization tower 1 is in normal use, the fourth valve is normally closed. When the desulfurization tower 1 needs to be repaired, the third valve 101 can be opened to discharge the waste gas in the desulfurization tower 1 through the waste gas exhaust branch 10.

[0060] The working process of the high-efficiency and energy-saving flue gas desulfurization and purification device in this embodiment of the invention is as follows: The raw flue gas enters the desulfurization tower 1 from the inlet flue 2, and first comes into countercurrent contact with the slurry below the first sprayer 81 to remove most of the acidic gas SO. x Then the flue gas passes through the first spray layer 100, and then through the exhaust assembly 42 in the middle of the first circulating water recovery layer 200, and enters below the second sprayer 82. Here, the flue gas and slurry come into countercurrent contact again to remove the remaining acidic gas SO. x Finally, the flue gas passes through the second spray layer 300, the demister 5, and the flue gas outlet in sequence, and is finally discharged into the chimney through the outlet flue 3.

[0061] In this system, the slurry sprayed by the second sprayer 82 is collected in a water collection tank and re-enters the storage tank 11 through the first return water branch 71, eliminating the need for a circulating water pump and reducing energy consumption. Furthermore, the exhaust pipe 423 formed between the first spray layer 100 and the second spray layer 300 by the exhaust assembly 42 achieves the desulfurization efficiency of a single tower compared to a series tower.

[0062] Please see Figure 3 , Figure 3 A schematic diagram of the structure of a second embodiment of a high-efficiency and energy-saving flue gas desulfurization and purification device according to the present invention is shown.

[0063] In one embodiment, the desulfurization tower 1 is provided with three spray layers. The desulfurization tower 1 is provided with a first spray layer 100, a first circulating water recovery layer 200, a second spray layer 300, a second circulating water recovery layer 400, a third spray layer 500, and a demister 5 in sequence between the flue gas inlet and the flue gas outlet along the flue gas flow direction.

[0064] The raw flue gas passes sequentially through inlet flue 2, flue gas inlet of desulfurization tower 1, first spray layer 100, first circulating water recovery layer 200, second spray layer 300, second circulating water recovery layer 400, third spray layer 500, demister 5, flue gas outlet, and finally is discharged into the chimney through outlet flue 3.

[0065] The first spray layer 100 is equipped with a first sprayer 81, the first circulating water recovery layer 200 is equipped with a first water collection and exhaust component 4, the second spray layer 300 is equipped with a second sprayer 82, the second circulating water recovery layer 400 is equipped with a second water collection and exhaust component 4, the third spray layer 500 is equipped with a third sprayer 83, the return water branch includes a first return water branch 71 and a second return water branch 72, and the spray branch includes a first spray branch 61, a second spray branch 62 and a third spray branch 63.

[0066] Among them, one end of the first spray branch 61 is connected to the liquid storage tank 11, and the other end of the first spray branch 61 is connected to the first sprayer 81; one end of the second spray branch 62 is connected to the liquid storage tank 11, and the other end of the second spray branch 62 is connected to the second sprayer 82; one end of the third spray branch 63 is connected to the liquid storage tank 11, and the other end of the third spray branch 63 is connected to the third sprayer 83; one end of the first return water branch 71 is connected to the liquid storage tank 11, and the other end of the first return water branch 71 is connected to the first water collection and exhaust component 4; one end of the second return water branch 72 is connected to the liquid storage tank 11, and the other end of the second return water branch 72 is connected to the second water collection and exhaust component 4.

[0067] The third spray branch 63 has the same structure as the first spray branch 61 and the second spray branch 62, and will not be described in detail; the third sprayer 83 has the same structure as the first sprayer 81 and the second sprayer 82, and will not be described in detail; the second water collection and exhaust component 4 has the same structure as the first water collection and exhaust component 4, and will not be described in detail.

[0068] Based on the above embodiments, those skilled in the art should understand that multiple spray layers are set in the desulfurization tower 1, and multiple spray branches, multiple circulating water recovery layers, and multiple return water branches are set accordingly to achieve the corresponding functions, so no further examples will be given.

[0069] The raw flue gas, after passing through the high-efficiency and energy-saving flue gas desulfurization and purification device of this embodiment, exhibits reduced system resistance and lower circulating pump power consumption compared to traditional FGD desulfurization towers. With five spray layers, the resistance can be reduced by 260 Pa, and with six spray layers, the resistance can be reduced by 500 Pa. For a 660MW unit, the resistance is 2,300,000 Nm. 3 Taking the flue gas volume per hour as an example, the resistance of the absorption tower can be reduced by 260 Pa with five spray layers and by 500 Pa with six spray layers; the power consumption of the circulating pump is reduced by 600 kWh and 900 kWh respectively, and the annual operating cost is reduced by 1.82 million yuan and 3 million yuan respectively.

[0070] In addition, the purification device of the present invention has the advantages of simple installation, space saving, reduced system resistance, and low operating energy consumption.

[0071] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-efficiency and energy-saving flue gas desulfurization and purification device, characterized in that, This includes the desulfurization tower, spray branch lines, and return water branch lines; The desulfurization tower includes a storage tank at its bottom, a flue gas inlet on the upper side wall of the storage tank, a flue gas outlet, a demister below the flue gas outlet, multiple spray layers between the flue gas inlet and the demister, a circulating water recovery layer between adjacent spray layers, a sprayer in each spray layer, a sprayer connected to the storage tank via a spray branch, and a water collection and exhaust component in each circulating water recovery layer. The water collection and exhaust component includes a water collection assembly and an exhaust assembly. The water collection assembly forms a water collection tank with the inner wall of the desulfurization tower. The water collection tank is connected to the liquid storage tank through the return water branch. The exhaust assembly is installed on the water collection assembly. The exhaust assembly includes an exhaust pipe that connects to an adjacent spray layer. The lower end of the exhaust pipe is sealed to the water collection tank, and the upper end of the exhaust pipe is higher than the liquid level in the water collection tank. The water collection assembly includes a cylindrical body and a sealing plate. The cylindrical body is open at both the top and bottom. The lower end of the cylindrical body is sealed to the inner wall of the desulfurization tower. The cylindrical body, the sealing plate, and the inner wall of the desulfurization tower form a water collection trough. Multiple exhaust assemblies are provided on the cylindrical body and the sealing plate. The cylindrical body is a conical cylindrical body. The upper end of the exhaust pipe is also provided with a water-blocking structure, which is used to guide the sprayed slurry into the water collection tank and prevent the sprayed slurry from entering the exhaust pipe; the water-blocking structure includes a flue cap and a support rod; the lower end of the flue cap is connected to the upper end of the exhaust pipe through multiple support rods, and the flue cap and the upper end of the exhaust pipe have gas channels; the flue cap is umbrella-shaped.

2. The high-efficiency energy-saving flue gas desulfurization and purification device according to claim 1, characterized in that, The flue gas outlet is located on the top side wall of the desulfurization tower.

3. The high-efficiency energy-saving flue gas desulfurization and purification device according to claim 1, characterized in that, The number of spray branches corresponds one-to-one with the number of sprayers, and each sprayer is connected to the liquid storage tank through one of the spray branches.

4. The high-efficiency energy-saving flue gas desulfurization and purification device according to claim 1, characterized in that, The number of return water branches corresponds one-to-one with the number of water collection and venting components, and each water collection tank is connected to the liquid storage tank through one of the return water branches.

5. The high-efficiency energy-saving flue gas desulfurization and purification device according to claim 1, characterized in that, The sprayer includes a spray pipe and multiple nozzles; Multiple nozzles are evenly spaced on the spray pipe, one end of which is fixed to the inner wall of the desulfurization tower and connected to the spray branch, and the openings of the multiple nozzles face downwards.

6. The high-efficiency energy-saving flue gas desulfurization and purification device according to claim 5, characterized in that, The spray branch includes pipes, a first valve, a circulating pump, and a pressure gauge; One end of the pipeline is connected to the liquid storage tank, and the other end of the pipeline is connected to the spray pipe. The first valve, the circulating pump, and the pressure gauge are sequentially connected to the pipeline.

7. The high-efficiency energy-saving flue gas desulfurization and purification device according to any one of claims 1-6, characterized in that, It also includes liquid drainage branches; The liquid venting branch is located on the side wall at the bottom of the desulfurization tower, and is connected to the liquid storage tank. A second valve is installed on the liquid venting branch.

8. The high-efficiency energy-saving flue gas desulfurization and purification device according to any one of claims 1-6, characterized in that, It also includes exhaust gas venting branch lines; The exhaust gas vent branch is located at the top of the desulfurization tower, above the demister, and a third valve is installed on the exhaust gas vent branch.

Images