Accident spraying device and flue gas desulfurization system

Abstract

The utility model belongs to the technical field of flue gas desulfurization, and discloses an accident spraying device and a flue gas desulfurization system.The accident spraying device is used for being connected with an inlet flue of an absorption tower, the accident spraying device comprises a spraying pipeline and a protection pipeline, the spraying pipeline comprises a spraying main pipe and a plurality of spraying branch pipes, and the protection pipeline is connected with the spraying main pipe. The ends, on the same side, of the multiple spraying branch pipes are detachably connected with the spraying main pipe, the multiple spraying branch pipes are detachably connected with the inlet flue, and the ends, away from the spraying main pipe, of the spraying branch pipes are located in the inlet flue. One end of the protection pipeline is connected with the spraying main pipe, and the protection pipeline is connected with a protection control piece. Thus, the protection control piece can control the protection gas to be conveyed into the spraying main pipe and the spraying branch pipes through the protection pipeline, directional and stable gas flow is formed, high-temperature sulfur-containing flue gas in the inlet flue is prevented from entering the spraying branch pipes and the spraying main pipe, and therefore the spraying branch pipes and the spraying main pipe are prevented from being corroded by the flue gas.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas desulfurization, in particular to an emergency spray device and a flue gas desulfurization system. Background Art

[0002] Flue gas desulfurization is a process for removing sulfur oxides (eg, sulfur dioxide and sulfur trioxide) from flue gases or other industrial waste gases.

[0003] The flue gas desulfurization system includes an emergency spray device, an absorption tower, a dust collector and a chimney. The boiler, the emergency spray device, the absorption tower, the dust collector and the chimney are connected by pipelines, so that the high-temperature sulfur-containing flue gas discharged from the boiler enters the absorption tower. The absorption tower is provided with a spray device and a demister. The spray device can spray atomized limestone slurry on the flue gas inside the absorption tower. The demister can remove the droplets carried by the flue gas, so that the high-temperature sulfur-containing flue gas forms clean flue gas that meets environmental protection requirements in the absorption tower. The clean flue gas enters the dust collector and is discharged through the chimney to achieve flue gas desulfurization. The emergency spray device includes a main pipe and multiple branch pipes. The multiple branch pipes are welded to the main pipe and are connected to the main pipe. When the internal structure of the absorption tower fails or the boiler leaks, in order to prevent the high-temperature sulfur-containing flue gas from directly entering the absorption tower and causing damage to the demister that is not resistant to high temperatures, it is necessary to start the emergency spray device to spray process water on the flue gas through the branch pipe to cool the high-temperature sulfur-containing wet flue gas.

[0004] However, since the emergency spray device is connected to the absorption tower and the boiler through pipes, when the flue gas desulfurization system is working normally, some of the high-temperature sulfur-containing flue gas will enter the branch pipe and adhere to the inner wall of the branch pipe, causing serious corrosion or even leakage of the branch pipe. When an accident occurs, the high-temperature sulfur-containing flue gas cannot be sprayed and cooled normally. If the corrosion resistance of the branch pipe is improved by coating it with anti-corrosion scales, when the branch pipe is damaged and needs to be replaced, it is necessary to use cutting tools to dismantle the branch pipe. The high temperature generated during dismantling may cause the anti-corrosion scales made of flammable materials to catch fire, posing a safety hazard. Utility Model Content

[0005] The utility model aims to provide an emergency spray device and a flue gas desulfurization system to solve the problem that the branch pipe is easily corroded due to long-term contact with high-temperature sulfur-containing flue gas.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] On the one hand, an emergency spray device is used to be connected to the inlet flue of an absorption tower, and the emergency spray device includes:

[0008] A spray pipeline, wherein the spray pipeline comprises a spray main pipe and a plurality of spray branch pipes, the spray main pipe is connected to the plurality of spray branch pipes, one end of the same side of the plurality of spray branch pipes is detachably connected to the spray main pipe, the plurality of spray branch pipes are detachably connected to the inlet flue, and one end of the spray branch pipe away from the spray main pipe is located in the inlet flue;

[0009] A protection pipeline, one end of which is connected to the spray main pipe and is used to transport protective gas to the spray main pipe and the spray branch pipe. The protection pipeline is connected to a protection control component for controlling the flow of the protective gas.

[0010] Preferably, the spray pipeline further comprises a delivery pipeline, one end of which is connected to the spray main pipe for delivering process water into the spray main pipe, and the delivery pipeline is connected to a delivery control component for controlling the flow of the process water.

[0011] Preferably, one end of the protection pipe facing the conveying pipe is arranged downstream of the conveying control member.

[0012] Preferably, the protection control element is a pneumatic door; and / or the conveying control element is a pneumatic door.

[0013] Preferably, the spray main pipe and the protective pipe are both arranged outside the inlet flue, and the end of the spray branch pipe facing away from the spray main pipe passes through the inlet flue.

[0014] Preferably, a flange is provided at the connection between the spray branch pipe and the inlet flue, the flange is located inside the inlet flue, and the flange is sealed and connected to the inner wall of the inlet flue.

[0015] Preferably, a sealing gasket is provided between the flange and the inlet flue, one side of the sealing gasket is sealingly connected to the flange, and the other side of the sealing gasket is selectively connected to the inner wall of the inlet flue.

[0016] Preferably, the inner wall of the spray main pipe is coated with anti-corrosion flakes; and / or the inner wall of the spray branch pipe is coated with anti-corrosion flakes.

[0017] Preferably, the spray main pipe is connected to a pressure detection component for detecting the gas pressure inside the spray main pipe.

[0018] On the other hand, a flue gas desulfurization system includes an absorption tower, a chimney and the above-mentioned emergency spraying device, wherein the emergency spraying device, the absorption tower and the chimney are connected in sequence through pipelines.

[0019] Beneficial effects of the utility model:

[0020] An emergency spray device is used to be connected to the inlet flue of an absorption tower, and the emergency spray device comprises: a spray pipeline, wherein the spray pipeline comprises a spray main pipe and multiple spray branch pipes, the spray main pipe is connected to the multiple spray branch pipes, one end of the multiple spray branch pipes on the same side is detachably connected to the spray main pipe, the multiple spray branch pipes are detachably connected to the inlet flue, and one end of the spray branch pipe away from the spray main pipe is located in the inlet flue; a protection pipe, one end of the protection pipe is connected to the spray main pipe, and is used to transport protective gas to the spray main pipe and the spray branch pipes, and the protection pipe is connected to a protection control component for controlling the flow of the protective gas.

[0021] In this way, when an accident occurs, the process water used for spray cooling can be transported to the spray branch pipe through the spray main pipe, and the high-temperature sulfur-containing flue gas can be spray-cooled through the spray branch pipe to avoid the high-temperature sulfur-containing flue gas from contacting the demister and causing damage to the demister; when the boiler and flue gas desulfurization system are operating normally, the protective gas is transported to the spray main pipe and the spray branch pipe through the protective pipe. Under the action of the airflow of the protective gas, the high-temperature sulfur-containing flue gas in the inlet flue is not easy to enter the spray branch pipe and the spray main pipe, avoiding the spray branch pipe and the spray main pipe from being corroded or damaged due to long-term contact with the high-temperature sulfur-containing flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an emergency sprinkler device in one embodiment of the utility model;

[0023] Figure 2 It is an enlarged view of point A of the emergency sprinkler device in one embodiment of the utility model.

[0024] In the figure:

[0025] 1. Spray pipeline; 11. Spray main pipe; 111. Pressure detection component; 12. Spray branch pipe; 121. Nozzle; 122. Flange; 13. Delivery pipeline; 131. Delivery control component; 14. Connecting piece; 2. Protection pipeline; 21. Protection control component; 3. Inlet flue.

[0026] Figure 1 In the diagram, the arrow direction indicates the delivery direction of process water or compressed gas. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] See also Figure 1 The utility model provides an emergency spray device, which is used to be connected to the inlet flue 3 of the absorption tower. The emergency spray device includes a spray pipeline 1 and a protection pipeline 2. The spray pipeline 1 includes a spray main pipe 11 and multiple spray branch pipes 12. The spray main pipe 11 is connected to the multiple spray branch pipes 12. One end of the multiple spray branch pipes 12 on the same side is detachably connected to the spray main pipe 11. The multiple spray branch pipes 12 are detachably connected to the inlet flue 3. One end of the spray branch pipe 12 away from the spray main pipe 11 is located in the inlet flue 3; one end of the protection pipeline 2 is connected to the spray main pipe 11, which is used to transport protective gas to the spray main pipe 11 and the spray branch pipes 12. The protection pipeline 2 is connected with a protection control component 21 for controlling the flow of protective gas.

[0032] It should be noted that after transporting process water to the high-temperature sulfur-containing flue gas, process water may remain on the inner walls of the spray main pipe 11 and the spray branch pipe 12. If the high-temperature sulfur-containing flue gas enters the spray main pipe 11 through the spray branch pipe 12, the sulfur oxides in the sulfur-containing flue gas will dissolve in water to form acidic substances, which will intensify the corrosion of the spray main pipe 11 and the spray branch pipe 12.

[0033] Among them, the spray main pipe 11 is horizontally arranged, the length direction of the spray main pipe 11 is parallel to the width direction of the inlet flue 3, the multiple spray branch pipes 12 are vertically arranged, and the multiple spray branch pipes 12 are evenly arranged along the length direction of the spray main pipe 11, and the end of the spray branch pipe 12 away from the spray main pipe 11 is provided with a nozzle 121 for spraying process water into the inlet flue 3; the protective gas is compressed air.

[0034] In this way, under the action of the protection control component 21, by transporting the protection gas into the protection pipe 2, the protection gas is transported to each spray branch pipe 12 through the spray main pipe 11, and enters the inlet flue 3 through the spray branch pipe 12, so that a directional airflow can continuously pass through the spray main pipe 11 and the spray branch pipe 12, thereby blocking the high-temperature sulfur-containing flue gas in the inlet flue 3 from entering the spray branch pipe 12 and the spray main pipe 11, thereby avoiding the inner walls of the spray branch pipe 12 and the spray main pipe 11 from contacting with the high-temperature sulfur-containing flue gas for a long time and being corroded, thereby extending the service life of the spray branch pipe 12 and the spray main pipe 11.

[0035] It is understandable that the protective gas can also be an inert gas such as nitrogen, which can fill the spray main pipe 11 and the spray branch pipe 12 with gas to prevent high-temperature sulfur-containing flue gas from flowing into the spray main pipe 11 and the spray branch pipe 12. The type of protective gas can be adjusted according to actual needs and will not be listed in detail here.

[0036] See also Figure 1 In some embodiments, the spray pipeline 1 further includes a delivery pipe 13, one end of which is connected to the spray main pipe 11 and is used to deliver process water to the spray main pipe 11. The delivery pipe 13 is connected to a delivery control member 131 for controlling the flow of process water. Further, the protection control member 21 and the delivery control member 131 are both pneumatic gates.

[0037] In this way, under the action of the delivery control component 131, process water can be selectively delivered to the spray main pipe 11 according to work needs, while preventing the high-temperature sulfur-containing flue gas inside the inlet flue 3 from entering the delivery pipe 13 through the spray main pipe 11, thereby preventing the inside of the delivery pipe 13 from corroding.

[0038] It should be noted that when the boiler and the flue gas desulfurization system are operating normally, the delivery control component 131 is closed, the interior of the delivery pipeline 13 is closed, and the delivery of process water to the spray main pipe 11 is stopped. When an accident occurs and the high-temperature sulfur-containing flue gas needs to be sprayed for cooling, the delivery control component 131 is started to spray the process water through the delivery pipeline 13, the spray main pipe 11, and the spray branch pipe 12 until it is mixed with the high-temperature sulfur-containing flue gas to achieve a cooling effect.

[0039] It is understandable that the protection control component 21 and the delivery control component 131 can also be fluid control structures such as butterfly valves and one-way valves. The specific structures of the protection control component 21 and the delivery control component 131 can be adjusted according to actual needs and will not be elaborated here.

[0040] See also Figure 1 In some embodiments, the end of the protection pipe 2 facing the delivery pipe 13 is arranged downstream of the delivery control member 131. It should be noted that the portion from the output end of the delivery control member 131 to the connection between the delivery pipe 13 and the spray main pipe 11 is the downstream of the delivery control member 131.

[0041] In this way, by changing the states of the delivery control component 131 and the protection control component 21, the process water or protection gas can be controlled to enter the spray main pipe 11 according to the states of the boiler and the flue gas desulfurization system. When the delivery control component 131 is closed, the protection gas is delivered to the downstream of the delivery control component 131 through the protection pipeline 2, which can prevent the high-temperature sulfur-containing flue gas from entering the delivery pipeline 13 through the spray main pipe 11 and causing corrosion to the delivery pipeline 13.

[0042] It is understandable that the installation positions of the delivery control component 131 and the protection control component 21 can be adjusted according to actual needs, as long as they can control the delivery of process water and protective gas, and no further details will be given here.

[0043] See also Figure 1 In some embodiments, the spray main pipe 11 and the protection pipe 2 are both arranged outside the inlet flue 3, and the end of the spray branch pipe 12 facing away from the spray main pipe 11 passes through the inlet flue 3.

[0044] In this embodiment, one end of the spray branch pipe 12 is detachably connected to the spray main pipe 11 through a connecting piece 14, and the other end passes through the inlet flue 3 and is detachably connected to the inner wall of the inlet flue 3. Furthermore, the connecting piece 14 is a tee, and the spray branch pipes 12 located at both ends of the spray main pipe 11 are adaptively connected to the spray main pipe 11 through a two-way connection.

[0045] In this way, compared with directly welding the spray branch pipe 12 to the inlet flue 3, the spray branch pipe 12 can be detachably connected to the spray main pipe 11 and the inlet flue 3, which can improve the loading and unloading flexibility of the spray branch pipe 12, facilitate the disassembly of the spray branch pipe 12 that needs to be replaced, and realize the quick loading and unloading of the spray branch pipe 12. When the spray branch pipe 12 is installed to the inlet flue 3, it is respectively connected to the spray main pipe 11 and the inner wall of the inlet flue 3, so that the spray branch pipe 12 can be stably set on the inlet flue 3, and when any pipeline fails or is damaged, it can be disassembled and repaired in time and the corresponding interface can be sealed, so that other spray branch pipes 12 can work normally.

[0046] It is understandable that the connector 14 is not limited to a tee, and a hose or other structure may also be used. The specific structure of the connector 14 may be flexibly adjusted according to actual needs.

[0047] See also Figure 1 and Figure 2 In some embodiments, a flange 122 is provided at the connection between the spray branch pipe 12 and the inlet flue 3. The flange 122 is located inside the inlet flue 3 and is sealed to the inner wall of the inlet flue 3. The flange 122 is welded to the spray branch pipe 12, and the spray branch pipe 12 is detachably connected to the inlet flue 3 through the flange 122.

[0048] In this way, by releasing the connection between the flange 122 and the inlet flue 3, the spray branch pipe 12 can be quickly removed, thereby improving the loading and unloading efficiency of the spray branch pipe 12, so that the corroded or damaged spray branch pipe 12 can be replaced in time to avoid affecting the spraying effect due to corrosion or damage.

[0049] See also Figure 1 and Figure 2 In some embodiments, a sealing gasket (not shown in the figure) is provided between the flange 122 and the inlet flue 3 , one side of the sealing gasket is sealedly connected to the flange 122 , and the other side is selectively connected to the inner wall of the inlet flue 3 .

[0050] In this embodiment, the sealing gasket includes an adhesive layer (not shown in the figure) and a sealing layer (not shown in the figure), the adhesive layer is made of wool felt material, and the sealing layer is made of fluororubber material. The adhesive layer is coated on the outside of the sealing layer, and the two sides of the adhesive layer are respectively bonded to the inner wall of the inlet flue 3 and the flange 122.

[0051] In this way, by setting a sealing gasket, the high-temperature sulfur-containing flue gas in the inlet flue 3 is not easily leaked to the outside through the gap between the spray branch pipe 12 and the inlet flue 3 to cause corrosion to the outer walls of the spray main pipe 11 and the spray branch pipe 12, thereby improving the airtightness and safety of the inlet flue 3.

[0052] It can be understood that the connection relationship between the adhesive layer and the sealing layer can also be adjusted according to actual needs. For example, the adhesive layer and the sealing layer are sheet structures of the same shape, one side of the adhesive layer is fixedly connected to one side of the sealing layer, the side of the adhesive layer facing away from the sealing layer is bonded to the inner wall of the inlet flue 3, and the side of the sealing layer facing away from the adhesive layer is fixedly connected to the flange 122, so that the flange 122 and the inlet flue 3 are sealed. The shape, material and connection relationship of the adhesive layer and the sealing layer can be flexibly adjusted, which will not be elaborated here.

[0053] See also Figure 1 In some embodiments, the inner wall of the spray main pipe 11 and the inner wall of the spray branch pipe 12 are coated with anti-corrosion scales.

[0054] In this way, the anti-corrosion scales can improve the anti-corrosion performance of the spray main pipe 11 and the spray branch pipe 12. Since the spray branch pipe 12 is connected to the spray main pipe 11 through the connecting piece 14 and is connected to the inlet flue 3 through the flange 122, there is no need to use cutting equipment such as electric saws during disassembly, thereby avoiding the local temperature of the spray branch pipe 12 being too high during disassembly, thereby igniting the anti-corrosion scales made of flammable materials and creating a safety hazard.

[0055] See also Figure 1 In some embodiments, the spray main pipe 11 is connected to a pressure detection component 111 for detecting the gas pressure inside the spray main pipe 11. In this embodiment, the pressure detection component 111 is a pressure transmitter.

[0056] In this way, the protection control component 21 is opened to allow the protection gas to be delivered to the spray main pipe 11. The gas pressure inside the spray main pipe 11 is detected by the pressure detection component 111, so as to determine the filling condition of the protection gas in the spray main pipe 11, thereby avoiding insufficient protection gas content in the spray main pipe 11 due to other reasons (for example, damage to the protection pipeline 2, failure of the protection control component 21), thereby causing part of the high-temperature sulfur-containing flue gas to enter the spray main pipe 11 through the spray branch pipe 12, and further causing the spray branch pipe 12 and the spray main pipe 11 to be in contact with the high-temperature sulfur-containing flue gas for a long time and be corroded by it.

[0057] It is understandable that the pressure detection element 111 may also be other gas detection equipment that can detect the gas pressure in the spray main pipe 11, which will not be elaborated here.

[0058] See also Figure 1The utility model also provides a flue gas desulfurization system (not shown in the figure), including an absorption tower (not shown in the figure), a chimney (not shown in the figure) and an emergency spraying device, and the emergency spraying device, the absorption tower and the chimney are connected in sequence through pipelines. In this embodiment, the flue gas desulfurization system also includes an induced draft fan (not shown in the figure) and a dust collector (not shown in the figure), the induced draft fan is arranged upstream of the emergency spraying device, and the dust collector is arranged downstream of the absorption tower, that is, the induced draft fan, the emergency spraying device, the absorption tower, the dust collector, and the chimney are connected in sequence through pipelines.

[0059] In this way, the high-temperature sulfur-containing flue gas output by the boiler is transported to the emergency spray device through a pipeline under the action of the induced draft fan, and then passes through the absorption tower for desulfurization and the dust collector for dust removal before being discharged to the outside through the chimney.

[0060] When the boiler and flue gas desulfurization system are operating normally, the conveying control component 131 is closed and the protection control component 21 is opened, so that the protective gas is transported to the inside of the inlet flue 3 through the protection pipeline 2 through the spray main pipe 11 and the spray branch pipe 12, and mixed with the high-temperature sulfur-containing flue gas to enter the absorption tower. Under the action of the airflow of the protective gas, the high-temperature sulfur-containing flue gas is not easy to enter the spray branch pipe 12 and the spray main pipe.

[0061] When an accident occurs and the high-temperature sulfur-containing flue gas needs to be sprayed to cool it down, the delivery control component 131 is opened, the protection control component 21 is closed, and the process water is delivered to the spray main pipe 11 and the spray branch pipe 12 through the delivery pipeline 13, thereby combining with the high-temperature sulfur-containing flue gas to reduce the flue gas temperature and prevent the high-temperature sulfur-containing flue gas from contacting the demister that is not resistant to high temperatures, thereby causing damage to the demister.

[0062] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. An emergency sprinkler device, characterized in that: Used to be connected to the inlet flue (3) of the absorption tower, the emergency spray device comprises: A spray pipeline (1), the spray pipeline (1) comprising a spray main pipe (11) and a plurality of spray branch pipes (12), the spray main pipe (11) being connected to the plurality of spray branch pipes (12), one end of the plurality of spray branch pipes (12) on the same side being detachably connected to the spray main pipe (11), the plurality of spray branch pipes (12) being detachably connected to the inlet flue (3), and one end of the spray branch pipe (12) facing away from the spray main pipe (11) being located in the inlet flue (3); A protection pipe (2), one end of which is connected to the spray main pipe (11) and is used to transport protective gas into the spray main pipe (11) and the spray branch pipe (12); the protection pipe (2) is connected to a protection control component (21) for controlling the flow of the protective gas.

2. The emergency sprinkler device according to claim 1, characterized in that: The spray pipeline (1) further comprises a delivery pipeline (13), one end of which is in communication with the spray main pipe (11) and is used to deliver process water into the spray main pipe (11); the delivery pipeline (13) is connected to a delivery control component (131) for controlling the flow of the process water.

3. The emergency sprinkler device according to claim 2, characterized in that: One end of the protection pipe (2) facing the conveying pipe (13) is arranged downstream of the conveying control member (131).

4. The emergency sprinkler device according to claim 2, characterized in that: The protection control component (21) is a pneumatic door; and / or the delivery control component (131) is a pneumatic door.

5. The emergency sprinkler device according to claim 1, characterized in that: The spray main pipe (11) and the protective pipe (2) are both arranged outside the inlet flue (3), and one end of the spray branch pipe (12) facing away from the spray main pipe (11) passes through the inlet flue (3).

6. The emergency sprinkler device according to claim 1, characterized in that: A flange (122) is provided at the connection between the spray branch pipe (12) and the inlet flue (3); the flange (122) is located inside the inlet flue (3); and the flange (122) is sealedly connected to the inner wall of the inlet flue (3).

7. The emergency sprinkler device according to claim 6, characterized in that: A sealing gasket is provided between the flange (122) and the inlet flue (3); one side of the sealing gasket is sealedly connected to the flange (122), and the other side is selectively connected to the inner wall of the inlet flue (3).

8. The emergency sprinkler device according to any one of claims 1 to 7, characterized in that: The inner wall of the spray main pipe (11) is coated with anti-corrosion flakes; and / or the inner wall of the spray branch pipe (12) is coated with anti-corrosion flakes.

9. The emergency sprinkler device according to any one of claims 1 to 7, characterized in that: The spray main pipe (11) is connected to a pressure detection component (111) for detecting the gas pressure inside the spray main pipe (11).

10. A flue gas desulfurization system, characterized in that: It comprises an absorption tower, a chimney and the emergency spraying device as described in any one of claims 1 to 9, wherein the emergency spraying device, the absorption tower and the chimney are connected in sequence through pipelines.

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