Kiln gas dust treatment system

Abstract

The embodiment of the utility model provides a kiln gas dust treatment system which comprises a separator, a gas inlet pipe, a liquid outlet pipe, a first spraying piece, a second spraying piece and a recovery tank, a separation cavity is formed in the separator, the gas inlet pipe is connected to the separator and communicates with the separation cavity so as to introduce kiln gas into the separation cavity, the first spraying piece is connected to the gas inlet pipe, and the second spraying piece is connected to the liquid outlet pipe. The water spraying pipe is used for spraying water to kiln gas in the gas inlet pipe; the second spraying piece is connected to the cavity wall of the separation cavity and used for spraying water to the cavity wall to form dust mixed liquid, and the two ends of the liquid outlet pipe are connected with the bottom of the separator and the recovery tank respectively and used for discharging the dust mixed liquid in the separation cavity to the recovery tank. By adopting the kiln gas dust treatment system provided by the embodiment of the invention, the dust content in the kiln gas can be reduced, the subsequent washing difficulty is reduced, dust residues in the separator are reduced, dust mixed liquid is discharged to the recovery tank through the liquid outlet pipe, the influence on a sewage system is avoided, the dust recovery function is also realized, and the waste of raw materials is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of soda ash preparation, and specifically relates to a kiln gas dust treatment system. Background Art

[0002] In the production of soda ash, limestone needs to be calcined in a lime kiln. The kiln gas generated during the calcination process contains not only a variety of gas components, but also a large number of dust particles of different sizes. Direct discharge into the atmosphere will cause environmental pollution. The kiln gas separator can initially separate the solid dust particles in the kiln gas, thereby reducing the dust content in the kiln gas and reducing the difficulty of subsequent kiln gas washing.

[0003] In the related technology, the separation effect of the kiln gas separator is poor, and a large amount of dust particles will remain in the kiln gas after separation, making subsequent washing more difficult; and the separated dust particles are directly discharged into the sewage system, which not only causes waste of raw materials and reduces economic benefits, but also easily causes blockage of the drainage system, which has an adverse impact on the on-site environment. Utility Model Content

[0004] The present application aims to provide a kiln gas dust treatment system to solve the problem that the existing kiln gas dust treatment system has poor dust particle separation effect and causes waste of raw materials.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] The present application discloses a kiln gas dust treatment system, comprising: a separator, an air inlet pipe, a liquid outlet pipe, a first spraying member, a second spraying member and a recovery tank; wherein,

[0007] A separation chamber is provided inside the separator, the air inlet pipe is connected to the separator and communicates with the separation chamber so as to introduce kiln gas into the separation chamber, and the first spraying member is connected to the air inlet pipe and is used to spray water into the kiln gas in the air inlet pipe;

[0008] The second spraying member is connected to the cavity wall of the separation cavity and is used to spray water onto the cavity wall to form a dust mixture. The two ends of the liquid outlet pipe are respectively connected to the bottom of the separator and the recovery tank and are used to discharge the dust mixture in the separation cavity to the recovery tank.

[0009] Optionally, the second spraying member includes an annular spraying pipe, and the annular spraying pipe is provided with a plurality of first nozzles spaced apart along the circumferential direction.

[0010] Optionally, the annular spray pipe includes a first arcuate surface and a second arcuate surface arranged in opposite directions along a first direction, the first arcuate surface is arranged away from the bottom of the separator, the first nozzle is connected to the first arcuate surface, and the first direction is the height direction of the separator.

[0011] Optionally, the second spraying member includes a water pipe and a second nozzle, the second nozzle is connected to the end of the water pipe, a spray port is provided on the air inlet pipe, the second nozzle at least partially passes through the spray port and is located in the air inlet pipe, wherein the second nozzle is an atomizing nozzle.

[0012] Optionally, the liquid outlet pipe includes a U-shaped pipe section, one end of the U-shaped pipe section is connected to the bottom of the separator, and the opening of the U-shaped pipe section is toward the top of the separator along a first direction, and the first direction is the height direction of the separator.

[0013] Optionally, there are multiple separators, and the kiln gas dust treatment system also includes a recovery main pipe. The multiple liquid outlet pipes connected to the bottom of the multiple separators are all connected to the recovery main pipe, and the dust mixed liquid is discharged to the recovery tank through the recovery main pipe, wherein the diameter of the recovery main pipe is larger than the diameter of the liquid outlet pipe.

[0014] Optionally, the kiln gas dust treatment system further includes a backwash water pipe, which is spaced apart from the liquid outlet pipe along a second direction and is connected to the recovery main pipe to introduce pipeline drainage water into the recovery main pipe, and the second direction is the length direction of the recovery main pipe.

[0015] Optionally, a first control valve is provided on the backflushing water pipe, and the first control valve is used to control the flow of water for pipeline dredging between the flushing water pipe and the recovery main pipe.

[0016] Optionally, a plurality of second control valves are provided on the recovery main pipe, wherein a second control valve is respectively provided on the side of the liquid outlet pipe away from the flushing pipe, and on the side of the flushing pipe away from the liquid outlet pipe. When the second control valves are closed, the recovery main pipe forms a closed flow channel between the two second control valves, and the closed flow channel is used for the flow of water used for dredging the pipeline.

[0017] Optionally, the kiln gas dust treatment system further includes a recovery pump and a desulfurization device, wherein the recovery pump is connected between the recovery tank and the desulfurization device and is used to pump the dust mixture in the recovery tank to the desulfurization device.

[0018] In the embodiment of the present application, since the air inlet pipe is connected to a first spraying member for spraying water into the kiln gas therein, the fine particles in the kiln gas can be condensed with water molecules to form larger particles. After the kiln gas enters the separator, these large particles composed of fine particles and water can be better discharged from the liquid outlet pipe, thereby reducing the dust content in the kiln gas, which is beneficial to reducing the difficulty of subsequent washing; when the second spraying member sprays water onto the wall of the separation chamber, the dust contaminated on the wall of the separator can be washed in time, reducing the dust residue inside the separator, and the dust mixture is discharged to the recovery tank through the liquid outlet pipe, avoiding the impact on the sewage system, reducing the waste of raw materials, and improving economic benefits.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 It is a schematic diagram of a kiln gas dust treatment system in the prior art;

[0022] Figure 2 It is a schematic diagram of the kiln gas dust treatment system in an embodiment of the present application.

[0023] Figure numerals: 10 - separator, 11 - separation chamber, 12 - second spray piece, 121 - annular spray pipe, 20 - air inlet pipe, 21 - first spray piece, 30 - liquid outlet pipe, 31 - U-shaped pipe section, 40 - air outlet pipe, 41 - kiln gas washing tower, 50 - recovery tank, 60 - recovery main pipe, 61 - second control valve, 70 - backwash water pipe, 71 - first control valve, 80 - recovery pump, 90 - desulfurization device, x - first direction, y - second direction. DETAILED DESCRIPTION

[0024] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0025] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 should not be understood as a limitation on the present application.

[0027] 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; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and 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.

[0028] In the production of soda ash, limestone needs to be calcined in a lime kiln. The kiln gas generated during the calcination process contains not only a variety of gas components, but also a large number of dust particles of different sizes. Directly discharging it into the atmosphere will cause environmental pollution. Figure 1 , is a structural diagram of the currently common kiln gas dust treatment system, such as Figure 1 As shown, the kiln gas separator of this kiln gas treatment system uses dry separation to initially separate solid dust particles from the kiln gas, thereby reducing the dust content in the kiln gas entering the kiln gas scrubber and making the kiln gas scrubbing process easier. Simultaneously, the solid dust separated by the kiln gas separator is discharged directly into the sewage tank through a trench. Factors such as the operational reliability and sealing of the kiln gas separator can affect its separation effectiveness. Directly discharging solid dust into the sewage system also results in material loss, reduces economic benefits, and can easily cause sewage system blockage. This increased unclogging effort not only wastes manpower but also impacts the on-site environment and wastewater treatment.

[0029] Based on the above reasons, the present invention provides a kiln gas dust treatment system to at least address the aforementioned issues of poor solid-gas separation and material loss. The kiln gas dust treatment system provided in the present invention can reduce the dust content in the kiln gas, making subsequent washing easier and reducing dust residue within the separator. The dust mixture is discharged through the liquid outlet pipe to a recovery tank, avoiding any impact on the sewage system. It also achieves dust recovery and reduces material waste.

[0030] The kiln gas dust treatment system provided by the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0031] It should be noted that if Figure 2 As shown, in the embodiment of the present application, the first direction x is the height direction of the separator, and the second direction y is the length direction of the recovery main pipe, wherein the first direction x intersects with the second direction y.

[0032] like Figure 2 As shown, the kiln gas dust treatment system disclosed in this application may specifically include: a separator 10, an air inlet pipe 20, a liquid outlet pipe 30, a first spray element 21, a second spray element 12, and a recovery tank 50. The separator 10 is internally provided with a separation chamber 11 for admitting kiln gas and performing preliminary separation thereof. The air inlet pipe 20 is connected to the separator 10 and communicates with the separation chamber 11 to allow kiln gas to enter the separation chamber 11. The first spray element 21 is connected to the air inlet pipe 20 and is used to spray water into the kiln gas in the air inlet pipe 20 to cause fine particles such as calcium oxide and calcium carbonate in the kiln gas to condense with water molecules to form larger particles.

[0033] Specifically, the air inlet pipe 20 is connected between the top and bottom of the separator 10, and the first spray element 21 is connected to the upper portion of the air inlet pipe 20 to spray water on the kiln gas from the top of the air inlet pipe 20 to enhance the agglomeration effect of the water spray. It should be noted that since the kiln gas generated during the lime kiln calcination process contains not only gaseous components such as carbon dioxide, oxygen, and sulfur dioxide, but also fine dust particles such as calcium oxide and calcium carbonate, in order to meet kiln gas emission requirements, the kiln gas needs to be scrubbed and purified to prevent serious environmental pollution. However, excessive solid dust content in the kiln gas will affect the kiln gas scrubbing effect. Therefore, solid-gas separation is required before kiln gas scrubbing to reduce the dust content of the kiln gas entering the kiln gas scrubber 41. In actual applications, the air inlet pipe 20 is also connected to the lime kiln to pass the kiln gas generated in the lime kiln into the separator 10 for preliminary solid-gas separation. However, due to the different sizes of solid dust particles in the kiln gas, only larger dust particles can be separated through dry separation. Due to their small size and light weight, tiny particles may still enter the kiln gas scrubber 41 along with the gas components through the air outlet pipe 40. In the embodiment of the present application, by providing a first spraying member 21 on the air inlet pipe 20, water can be sprayed on the kiln gas in the air inlet pipe 20, causing fine particles such as calcium oxide and calcium carbonate in the kiln gas to condense with water molecules to form larger particles, which then enter the separator 10 through the water inlet pipe for solid-gas separation, thereby improving the separation effect of the separator 10 and reducing the difficulty of the next kiln gas scrubbing step.

[0034] Furthermore, the second spray part 12 is connected to the cavity wall of the separation chamber 11, and is used to spray water onto the cavity wall to form a dust mixture liquid. The two ends of the liquid outlet pipe 30 are respectively connected to the bottom of the separator 10 and the recovery tank 50, and are used to discharge the dust mixture liquid in the separation chamber 11 to the recovery tank 50, so as to facilitate further recycling of the dust particles in the dust recovery liquid.

[0035] Specifically, the second spray part 12 is connected to the cavity wall near the bottom of the separator 10. In actual application, since the first spray part 21 is provided on the air inlet pipe 20 to spray water, the water content of the kiln gas entering the separator 10 increases, the humidity in the separation cavity 11 is relatively high, and solid particles are easily adhered to the cavity wall of the separation cavity 11. As the separator 10 is used for a longer time, it is easy to form scars on the cavity wall, which affects the dust recovery efficiency on the one hand, and on the other hand, the falling of scars can easily cause the smoothness of the liquid discharge from the liquid outlet. By providing a second water spray part and controlling the second water spray part to continuously spray water toward the cavity wall during the operation of the separator 10, the dust adhering to the cavity wall can be washed in time and discharged from the bottom, thereby avoiding scarring of the cavity wall and ensuring the recovery efficiency.

[0036] The recovery tank 50 can be provided to initially recover the dust mixture discharged from the separator 10 for subsequent recycling or reuse, thereby avoiding direct discharge into the sewage system and causing environmental pollution. It can also prevent the need for manual flushing of the sewage system, which increases labor costs and wastes industrial water. The embodiment of the present application does not specifically limit the size of the recovery tank 50. For example, the length, width, and height of the recovery tank 50 can be set to 1000 mm, 1000 mm, and 1500 mm, respectively. In actual applications, technicians can design it according to actual needs.

[0037] In the embodiment of the present application, the second spraying member 12 includes an annular spraying pipe 121 , and the annular spraying pipe 121 is provided with a plurality of first nozzles spaced apart along the circumferential direction to perform multiple flushing on the cavity wall.

[0038] Specifically, multiple first nozzles are evenly spaced along the circumference of the annular spray pipe 121 to improve the uniformity of flushing the separator 10 in the circumferential direction. For example, the number of first nozzles can be 2, 3, 4, 5, 6, etc., which is not specifically limited in this application. The number of first nozzles can be designed in combination with the spray angle of the first nozzles to ensure that the cavity wall is flushed by the first nozzles in the circumferential direction.

[0039] Optionally, the annular spray pipe 121 includes a first arcuate surface and a second arcuate surface arranged in opposite directions along the first direction x, the first arcuate surface is arranged away from the bottom of the separator 10, and the first nozzle is connected to the first arcuate surface.

[0040] Specifically, the annular spray pipe 121 is an annular circular tube, and the diameter of the annular spray pipe 121 can be set to 50mm, 60mm, 70mm, etc., and this application does not make any specific restrictions on this. This tubular spray pipe can ensure the smoothness of the flow of flushing water in the pipeline. Since the first curved surface is located on the side away from the bottom of the separator 10, the first nozzle is connected to the first curved surface. When the first nozzle sprays water, the water spray direction is upward, which increases the spray area of ​​the flushing water. Furthermore, the first nozzle can also be set on the second curved surface. The first curved surface and the first nozzle set on the second curved surface can be alternately set along the circumferential direction, or relatively set along the first direction x, so as to increase the flushing area and enhance the flushing effect. This application does not make any specific restrictions on this.

[0041] In an embodiment of the present application, the second spray element 12 includes a water pipe and a second nozzle, the second nozzle is connected to the end of the water pipe, a spray port is opened on the air inlet pipe 20, and the second nozzle at least partially passes through the spray port and is located in the air inlet pipe 20, wherein the second nozzle is an atomizing nozzle.

[0042] Specifically, the water pipe is located above the air inlet pipe 20, and the spray port is positioned there. This allows the second nozzle to spray water from the top of the air inlet pipe 20, thereby ensuring a wide spray area. In practical applications, the second nozzle is configured as an atomizing nozzle, which can atomize the liquid water in the water pipe into a very small diameter mist, increasing the contact area with the kiln gas. Furthermore, the smaller the mist particles, the slower their movement, ensuring effective integration with the kiln gas.

[0043] In the embodiment of the present application, the liquid outlet pipe 30 includes a U-shaped pipe section 31 , one end of the U-shaped pipe section 31 is connected to the bottom of the separator 10 , and the opening of the U-shaped pipe section 31 is directed toward the top of the separator 10 along the first direction x.

[0044] Specifically, the diameter of the U-shaped pipe section 31 can be 60mm, 80mm, 100mm, etc. This application does not make any specific restrictions on this. In actual application, it can be determined according to the size of the separator 10. The U-shaped pipe section 31 includes a first port and a second port. The first port is connected to the bottom of the separator 10, and the second port is also connected to a pipeline to transport the dust mixture to the recovery tank 50. Among them, along the first direction x, the height of the second port is lower than the height of the first port to ensure that the dust mixture can flow smoothly to the subsequent pipeline. It can be understood that since the opening of the U-shaped pipe section 31 is arranged toward the top of the separator 10, the dust mixture flowing out through the liquid outlet pipe 30 is first collected in the U-shaped pipe section 31. The mixed liquid in the U-shaped pipe section 31 can isolate the external air, enhance the sealing of the separation chamber 11, and prevent air from entering the separation chamber 11 and causing changes in the gas composition in the kiln gas.

[0045] Optionally, there are multiple separators 10, and the kiln gas dust treatment system also includes a recovery main pipe 60. The multiple liquid outlet pipes 30 connected to the bottom of the multiple separators 10 are all connected to the recovery main pipe 60, and the dust mixture is discharged to the recovery tank 50 through the recovery main pipe 60. The diameter of the recovery main pipe 60 is larger than the diameter of the liquid outlet pipe 30. For example, the diameter of the recovery main pipe 60 can be 120 mm, 150 mm, 180 mm, 200 mm, etc. This application does not make specific restrictions on this. In actual applications, it can be determined according to the number and size of the separators 10.

[0046] In practical applications, multiple lime kilns may be operating simultaneously, each connected to a separator 10, or a single lime kiln may be connected to multiple separators 10. Multiple separators 10 improve kiln gas processing efficiency. Furthermore, a recovery manifold 60 allows for centralized discharge of the dust mixture from multiple separators 10, simplifying the system structure and facilitating operation and management.

[0047] Optionally, the kiln gas dust treatment system also includes a backwash water pipe 70, which is spaced apart from the liquid outlet pipe 30 along the second direction y and is connected to the recovery main pipe 60 to introduce pipeline drainage water into the recovery main pipe 60, and the pipeline drainage water is used to flush the pipe wall of the recovery main pipe 60.

[0048] In actual applications, the dust mixture settles on the wall of the recovery main pipe 60 during its flow in the recovery main pipe 60. As the amount of sedimentation increases, the flow rate of the dust mixture in the recovery main pipe 60 will be affected. In severe cases, the recovery main pipe 60 may be blocked. By setting a backwash water pipe 70, water for pipeline drainage can be introduced into the recovery main pipe 60 through the backwash water pipe 70 to flush the sediment on the wall of the recovery main pipe 60 to prevent the sediment from clogging the pipeline. The water for pipeline drainage can be high-pressure water, which can improve the flushing effect and efficiency.

[0049] like Figure 2 As shown, a first control valve 71 is provided on the backflushing water pipe 70 , and the first control valve 71 is used to control the flow of water for pipeline dredging between the flushing pipe and the recovery main pipe 60 .

[0050] In actual applications, when the wall of the recovery main pipe 60 is in a clean state, or when the amount of sediment has little effect on the flow of the dust mixture, the backwash water pipe 70 can be omitted. Therefore, setting the first control valve 71 can improve the flexibility of system control, and the operator can choose to open or close the first control valve 71 according to the actual operating conditions of the system.

[0051] Optionally, a plurality of second control valves 61 are provided on the recovery main pipe 60, wherein, for example, Figure 2 As shown, a second control valve 61 is respectively provided on the side of the liquid outlet pipe 30 away from the flushing pipe, and on the side of the flushing pipe away from the liquid outlet pipe 30. When the second control valves 61 are closed, the recovery main pipe 60 forms a closed flow channel between the two second control valves 61, and the closed flow channel is used for the flow of water used for pipeline drainage.

[0052] It should be noted that when the recovery main pipe 60 is connected to the liquid outlet pipes 30 on multiple separators 10 at the same time, there may be differences in the sedimentation conditions along the length direction of the pipe wall of the recovery main pipe 60. By setting a second control valve 61, the pipe sections with severe sedimentation can be flushed separately, which simplifies the flushing procedure and is highly targeted, further improving the flushing efficiency of the recovery main pipe 60.

[0053] Optionally, the kiln gas dust treatment system further includes a recovery pump 80 and a desulfurization device 90 . The recovery pump 80 is connected between the recovery tank 50 and the desulfurization device 90 and is used to pump the dust mixture in the recovery tank 50 to the desulfurization device 90 .

[0054] Specifically, the recovery pump 80 can be a self-priming pump, a lifting pump, etc. The present application does not specifically limit the type of the recovery pump 80. The dust mixture in the recovery tank 50 contains quicklime GaO, and the quicklime GaO reacts with water to produce slaked lime Ga(OH)2. By setting up the recovery pump 80 to transport the dust mixture to the desulfurization device 90, the slaked lime Ga(OH)2 can be used as a reactant in the desulfurization reaction to carry out a desulfurization reaction with part of the gas in the kiln gas. This design further utilizes the dust in the recovery tank 50, improves the utilization rate of the material, and reduces material waste.

[0055] In summary, the kiln gas dust recovery system provided in the embodiments of the present application has at least the following advantages:

[0056] In the embodiment of the present application, since the air inlet pipe is connected to a first spraying member for spraying water into the kiln gas inside it, the fine particles in the kiln gas can be condensed with water molecules to form larger particles. After the kiln gas enters the separator, these large particles composed of fine particles and water can be better discharged from the liquid outlet pipe, thereby reducing the dust content in the kiln gas, which is conducive to reducing the difficulty of subsequent washing; when the second spraying member sprays water to the cavity wall of the separation chamber, the dust contaminated on the separator cavity wall can be washed in time, reducing the dust residue inside the separator, and the dust mixture is discharged to the recovery tank through the liquid outlet pipe, avoiding the impact on the sewage system, reducing the waste of raw materials, and improving economic benefits. The kiln gas treatment system provided by the present application has a stable separation effect on the dust in the kiln gas, a simple structure, and strong practicality. It has a promoting effect on the development of lime kiln gas dust separation and recovery technology, and is also applicable to other dust recovery processes with similar characteristics or physical properties.

[0057] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0058] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A kiln gas dust treatment system, characterized in that: include: Separator, air inlet pipe, liquid outlet pipe, first spray part, second spray part and recovery tank; wherein, A separation chamber is provided inside the separator, the air inlet pipe is connected to the separator and communicates with the separation chamber so as to introduce kiln gas into the separation chamber, and the first spraying member is connected to the air inlet pipe and is used to spray water into the kiln gas in the air inlet pipe; The second spraying member is connected to the cavity wall of the separation cavity and is used to spray water onto the cavity wall to form a dust mixture. The two ends of the liquid outlet pipe are respectively connected to the bottom of the separator and the recovery tank and are used to discharge the dust mixture in the separation cavity to the recovery tank.

2. The kiln gas dust treatment system according to claim 1, characterized in that: The second spraying member includes an annular spraying pipe, and a plurality of first nozzles are arranged on the annular spraying pipe at intervals along the circumferential direction.

3. The kiln gas dust treatment system according to claim 2, characterized in that: The annular spray pipe includes a first arcuate surface and a second arcuate surface arranged in opposite directions along a first direction. The first arcuate surface is arranged away from the bottom of the separator. The first nozzle is connected to the first arcuate surface. The first direction is the height direction of the separator.

4. The kiln gas dust treatment system according to claim 1, characterized in that: The second spraying member includes a water pipe and a second nozzle, the second nozzle is connected to the end of the water pipe, a spray port is provided on the air inlet pipe, the second nozzle at least partially passes through the spray port and is located in the air inlet pipe, wherein the second nozzle is an atomizing nozzle.

5. The kiln gas dust treatment system according to claim 1, characterized in that: The liquid outlet pipe includes a U-shaped pipe section, one end of which is connected to the bottom of the separator, and an opening of the U-shaped pipe section is directed toward the top of the separator along a first direction, which is the height direction of the separator.

6. The kiln gas dust treatment system according to claim 1, characterized in that: There are multiple separators, and the kiln gas dust treatment system also includes a recovery main pipe. The multiple liquid outlet pipes connected to the bottom of the multiple separators are all connected to the recovery main pipe, and the dust mixed liquid is discharged to the recovery tank through the recovery main pipe. The diameter of the recovery main pipe is larger than the diameter of the liquid outlet pipe.

7. The kiln gas dust treatment system according to claim 6, characterized in that: The kiln gas dust treatment system also includes a backwash water pipe, which is spaced apart from the liquid outlet pipe along the second direction and connected to the recovery main pipe to introduce pipeline drainage water into the recovery main pipe. The second direction is the length direction of the recovery main pipe.

8. The kiln gas dust treatment system according to claim 7, characterized in that: The backflushing water pipe is provided with a first control valve, which is used to control the on-off flow of the pipeline dredging water between the flushing water pipe and the recovery main pipe.

9. The kiln gas dust treatment system according to claim 7, characterized in that: A plurality of second control valves are provided on the recovery main pipe, wherein a second control valve is respectively provided on the side of the liquid outlet pipe away from the flushing pipe and the side of the flushing pipe away from the liquid outlet pipe. When the second control valves are closed, the recovery main pipe forms a closed flow channel between the two second control valves, and the closed flow channel is used for the flow of water used for dredging the pipeline.

10. The kiln gas dust treatment system according to claim 1, characterized in that: The kiln gas dust treatment system further includes a recovery pump and a desulfurization device. The recovery pump is connected between the recovery tank and the desulfurization device and is used to pump the dust mixture in the recovery tank to the desulfurization device.

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