Flue gas water seal device without inner cylinder structure

Abstract

The utility model provides a flue gas water seal device without an inner cylinder structure, which is used for connecting a first pipeline and a second pipeline and comprises a first branch pipe, a second branch pipe, a gas supplementing cylinder and a circulation hole, and the first branch pipe and the second branch pipe are connected to form a V-shaped structure; the first branch pipe is connected with the first pipeline, and the second branch pipe is connected with the second pipeline; the gas supplementing cylinder is arranged between the pipe wall of the first branch pipe and the pipe wall of the second branch pipe and used for guiding the high-pressure area of the first branch pipe into the low-pressure gas area of the second branch pipe so as to reduce flow resistance. The circulation hole is formed in the bottom of the first branch pipe and used for water inflow and drainage of the water seal device. Through the water seal device of the V-shaped structure, the requirement of the water seal device for the installation space is reduced, the use range of the water seal device is expanded, meanwhile, the guide cylinder is arranged to introduce upstream high-pressure gas into the low-pressure area of the inclined pipe, the purposes of reducing the size of a backflow area and the backflow strength are achieved, the circulation resistance of equipment is reduced, and the service life of the equipment is prolonged. And the purpose of low pressure drop is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial gas-phase medium interception, and particularly relates to a flue gas water seal device without an inner cylinder structure. Background Art

[0002] At present, in the refining and chemical industries, the interception technology of gas-phase media in large-diameter pipelines with high temperature and low pressure is generally required. In some cases, the interception technology is required to ensure that the medium leakage rate is zero. For example, in the energy recovery system of a fluid catalytic cracking unit in the petrochemical industry, when cutting off high-temperature flue gas, in order to ensure the safety of maintenance personnel, the medium leakage rate after the flue gas is cut off is required to be zero. The water seal tank is a commonly used zero-leakage high-temperature and low-pressure medium interception technology, which has the advantages of simple manufacturing, low cost, safety and reliability, etc. At the same time, the traditional water seal tank also has disadvantages such as large size and large flow resistance, which is not conducive to the energy recovery of flue gas.

[0003] Currently, new designs of refineries or refinery renovations have put forward corresponding requirements for the size and pressure drop of the water seal tank.

[0004] Publication No.: CN204900947U discloses a Y-shaped water seal tank, which includes a cylindrical tank body, a communication port, a communication pipe, an overflow port, and an inlet and outlet. The communication port is arranged at the top of the cylindrical tank body; the communication pipe is a streamline-shaped elbow and is installed on one side of the cylindrical tank body; at the connection of the cylindrical tank body and the communication pipe, a plurality of guide vanes are arranged; the inlet and outlet are arranged at the bottom of the cylindrical tank body, and the overflow port is arranged above the pipe orifice of the communication pipe. However, in this utility model, there are gas flow separation and secondary flow separation phenomena in the outlet direction of the air elbow, and the pipeline occupies a large space, resulting in large gas flow loss in the air elbow, affecting the further reduction of the pressure drop and the reduction of the occupied space.

[0005] Therefore, it is urgent to design a new type of water seal device to further reduce the pressure drop and reduce the occupied space. Summary of the Invention

[0006] In view of this, the purpose of the present utility model is to provide a flue gas water seal device without an inner cylinder structure, so as to achieve the purpose of a water seal tank with smaller space occupation and lower pressure drop.

[0007] Currently, for the water seal device that uses an elbow structure to change and cut off the flue gas flow direction, the elbow generally uses a smooth transition of a circular pipe, and the cross-section of the elbow is circular. There are gas flow separation and secondary flow separation phenomena in the outlet direction of the air elbow, resulting in large gas flow loss in the air elbow and affecting the performance of its upstream and downstream parts.

[0008] However, due to the fact that the powder particles in the gas stream usually have a very high velocity and tend to move along a straight-line trajectory, wear problems are likely to occur in the elbow structure. Therefore, the elbow structure is usually designed to have a relatively large bending radius, which limits the further reduction of the size of the water seal structure.

[0009] In order to further reduce the size of the water seal structure, the water seal device of the present utility model is designed as a V-shaped structure, as shown in the figure. At this time, the flow velocity distribution of the V-shaped structure is as shown in the figure. The flue gas flows into the device from the vertical pipe and flows out from the horizontal pipe section. During this process, serious flow separation is formed at the bottom of the V-shaped cylinder and the connection of the inclined pipe when the flue gas turns from the vertical direction to the horizontal direction. There is serious swirling flow in the flow separation zone. The swirling flow in this part causes a large amount of vortex dissipation, converting the mechanical energy of the flue gas into heat energy, and the macroscopic manifestation is the reduction of the flue gas pressure head, which is the resistance of the water seal tank.

[0010] In order to solve the pressure drop problem caused by the flow separation at the outlet direction of the water seal device, the present utility model provides a gas supply cylinder structure for balancing the air flow in the low-speed area that appears at the outlet direction of the water seal device and avoiding a large amount of vortex dissipation caused by the swirling flow phenomenon.

[0011] The technical solution of the present utility model is realized as follows: A flue gas water seal device without an inner cylinder structure is used to connect the first pipe and the second pipe, and includes a first branch pipe, a second branch pipe, a gas supply cylinder, and a circulation hole. The first branch pipe and the second branch pipe are connected in a V-shaped structure;

[0012] The first branch pipe is connected to the first pipe, and the second branch pipe is connected to the second pipe;

[0013] The gas supply cylinder is arranged between the pipe walls of the first branch pipe and the second branch pipe for introducing the high-pressure area of the first branch pipe into the low-pressure gas area of the second branch pipe to reduce the flow resistance;

[0014] The circulation hole is arranged at the bottom of the first branch pipe for the water inlet and drainage of the water seal device.

[0015] Further, the outlet end of the gas supply cylinder is arranged on the second branch pipe, and the outlet end is adjacent to point A.

[0016] Further, the diameter of the second branch pipe is D, and the perpendicular distance from the outlet end to the AB connection line is not greater than 1 / 3D.

[0017] Further, the angle between the flue gas flow direction in the first branch pipe and the axis of the gas supply cylinder is less than 45°.

[0018] Further, the angle between the flue gas flow direction in the first branch pipe and the axis of the gas supply cylinder is 30°.

[0019] Furthermore, the number of the air supplement cylinders is at least one, and the total cross-sectional area of the air supplement cylinders is greater than 1 / 10 and less than 1 / 5 of the cross-sectional area of the first pipe.

[0020] Furthermore, the number of the air supplement cylinders is 3.

[0021] Furthermore, a flow guiding vane is further included. The flow guiding vane is arc-shaped, and the radius of curvature of the flow guiding vane is not less than the radius of the first branch pipe.

[0022] Furthermore, the flow guiding vane is arranged at the bottom of the first branch pipe. One end of the flow guiding vane is connected to the first branch pipe, and the other end extends to the second branch pipe.

[0023] Furthermore, the first pipe and the first branch pipe are connected in a way of diameter expansion.

[0024] Compared with the prior art, a flue gas water seal device with a structure without an inner cylinder of the present invention has the following advantages:

[0025] 1. By arranging a water seal device with a V-shaped structure, the present invention reduces the requirement for the installation space of the water seal device, expands the application range of the water seal device, and at the same time arranges a flow guiding cylinder to introduce the upstream high-pressure gas into the low-pressure area of the inclined pipe, so as to achieve the purpose of reducing the size and intensity of the reflux area, reducing the flow resistance of the equipment, and achieving the purpose of low pressure drop.

[0026] 2. By arranging an arc-shaped flow guiding plate at the bottom, the present invention separates the lower low-pressure reflux area from the main flow east area, reduces the contribution of the bottom reflux area to the pressure drop, and further reduces the flow resistance of the equipment through the combined action of the bottom and upper flow guiding, so as to achieve the purpose of low pressure drop.

[0027] 3. By adopting the structure without an inner cylinder, the present invention avoids the problem that the liquid in the traditional water seal tank corrodes the inner cylinder, resulting in the failure of the inner cylinder structure and finally the failure of the water seal.

[0028] 4. After removing the inner cylinder, the water seal tank as a whole is V-shaped. The left and right branch pipes of the V-shaped structure are similar to the U-shaped pipe communicating vessel. When water sealing, according to the different inlet and outlet pressures, the heights of the liquid in the pipes on both sides of the V-shaped structure are different, so as to achieve the purpose of water sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0030] Figure 1 is a schematic structural diagram of the device of the present invention;

[0031] Figure 2 It is the flow velocity distribution diagram of the existing V-shaped water seal device;

[0032] Figure 3 It is the flow field diagram of the device of the present utility model.

[0033] Description of the reference numerals:

[0034] 1. First pipeline; 2. Second pipeline; 3. First branch pipe; 4. Second branch pipe; 5. Air supplement cylinder; 501. Outlet end; 6. Flow-through hole; 7. Guide vane; 8. Small water seal; 9. Connecting pipe. Detailed implementation manners

[0035] In order to make the technical means, achieved purposes and effects of the present utility model easy to understand, the embodiments of the present utility model will be described in detail below with reference to specific drawings.

[0036] It should be noted that all the terms indicating directions and positions in the present utility model, such as: "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "top", "bottom", "lateral", "longitudinal", "center", etc., are only used to explain the relative position relationship and connection situation between components in a certain specific state, and are only for the convenience of describing the present utility model, rather than requiring the present utility model to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features.

[0037] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" 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; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0038] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0039] The utility model discloses a flue gas water seal device without an inner cylinder structure, which is used to connect a first pipeline 1 and a second pipeline 2. The device includes a first branch pipe 3, a second branch pipe 4, an air supplement cylinder 5 and a circulation hole 6. The first branch pipe 3 and the second branch pipe 4 are connected to form a V-shaped structure;

[0040] The first branch pipe 3 is connected to the first pipeline 1, and the second branch pipe 4 is connected to the second pipeline 2;

[0041] The air supplement cylinder 5 is arranged between the pipe walls of the first branch pipe 3 and the second branch pipe 4, and is used to introduce the high-pressure area of the first branch pipe 3 into the low-pressure gas area of the second branch pipe 4 to reduce the flow resistance;

[0042] The circulation hole 6 is arranged at the bottom of the first branch pipe 3 and is used for the water inlet and drainage of the water seal device.

[0043] When the water seal device is in the water seal state, water enters the water seal device through the circulation hole 6. As the water injection volume increases, the liquid level inside the water seal device gradually rises until the flue gas circulation channel is cut off. The water seal device includes a V-shaped structure formed by the first branch pipe 3 and the second branch pipe 4 in communication. According to the different inlet and outlet pressures, the heights of the liquid on both sides of the V-shaped structure are different, achieving the purpose of water seal; when the flue gas is in the circulation stage, the water inside the water seal device is discharged from the circulation hole 6. The flue gas flows from the first pipeline 1 into the first branch pipe 3, flows out along the first branch pipe 3 and then enters the second branch pipe 4. Then the flue gas flows into the second pipeline 2 along the second branch pipe 4. During the high-speed flow process, an air supplement cylinder 5 is arranged between the high-pressure area in the first branch pipe 3 and the low-pressure area in the second branch pipe 4. Under the action of pressure, part of the flue gas in the first branch pipe 3 directly flows into the low-pressure area in the second branch pipe 4 from the air supplement cylinder 5, balancing the pressure difference in the second branch pipe 4 and reducing the swirl flow.

[0044] The first branch pipe 3 and the second branch pipe 4 are arranged in a V-shaped structure, which avoids the pipeline design with a large bending radius, enables the water seal device to realize the turning of gas in a limited space, reduces the space requirement for the installation and use of the water seal device, has a wider application field, and helps to achieve better use effects; at the same time, the air supplement cylinder 5 is arranged, so that part of the flue gas in the first branch pipe 3 directly flows into the low-pressure area in the second branch pipe 4 from the air supplement cylinder 5, which is used to reduce the size and intensity of the recirculation area, avoid serious swirl flow causing a large amount of vortex dissipation, convert the mechanical energy of the flue gas into heat energy, and the macroscopic manifestation is the reduction of the flue gas pressure head, that is, the resistance of the water seal device.

[0045] Specifically, there is a point A at the connection of the first branch pipe 3 and the second branch pipe 4, there is a point B on the first branch pipe 3, and there is a point C at the connection of the second branch pipe 4 and the second pipeline 2. The AB connection line on the first branch pipe 3 represents the barrel wall of the first branch pipe 3, and the AC connection line on the second branch pipe 4 represents the barrel wall of the second branch pipe 4.

[0046] Specifically, the outlet end 501 of the air injection cylinder 5 is arranged on the second branch pipe 4, and the outlet end 501 is arranged adjacent to point A.

[0047] During the process of the flue gas turning from the vertical direction to the horizontal direction, a serious flow separation is formed at the connection of the first branch pipe 3 and the second branch pipe 4. There is a serious swirling flow in the flow separation area. The swirling flow in this part causes a large amount of vortex dissipation, converting the mechanical energy of the flue gas into heat energy. The macroscopic manifestation is the reduction of the flue gas pressure head, which is the resistance of the water seal tank. The outlet end 501 of the air injection cylinder 5 is arranged on the second branch pipe 4, adjacent to the first branch pipe 3. The flue gas flows directly from the high-pressure area of the first branch pipe 3 along the air injection cylinder 5 to the low-pressure area of the second branch pipe 4.

[0048] This setting enables the water seal device to better reduce the size and intensity of the recirculation area, avoiding a large amount of vortex dissipation caused by serious swirling flow and excessive reduction of the flue gas pressure head.

[0049] Preferably, the diameter of the second branch pipe 4 is D, and the vertical distance between the outlet end 501 and the AB connection line is not greater than 1 / 3D.

[0050] Specifically, the angle between the flow direction of the flue gas in the first branch pipe 3 and the axis of the air injection cylinder 5 is less than 45°.

[0051] When the angle between the flow direction of the flue gas and the axis direction of the air injection cylinder 5 is small, the flue gas can smoothly enter the air injection cylinder 5. On the one hand, it reduces the turbulence and vortex phenomena generated at the interface. On the other hand, it reduces the phenomenon of flow velocity slowdown or stagnation caused by the sharp change of direction, helps to reduce energy loss, and maintains the stable flow state of the flue gas, improving the flow efficiency of the flue gas.

[0052] Preferably, the angle between the flow direction of the flue gas in the first branch pipe 3 and the axis of the air injection cylinder 5 is 30°.

[0053] This setting enables the flue gas to smoothly enter the air injection cylinder 5, reduces the flow resistance generated due to excessive angle, helps to maintain the stable flow state of the flue gas, and reduces energy loss. At the same time, it can effectively reduce the impact intensity of the flue gas on the inlet of the air injection cylinder 5, reduce the wear and corrosion phenomena caused by the impact, and extend the service life of the air injection cylinder 5.

[0054] Specifically, the total cross-sectional area of the air injection cylinder 5 is greater than 1 / 10 of the cross-sectional area of the first pipe 1 and less than 1 / 5.

[0055] The total area of the air supplement cylinder 5 directly affects the air supplement capacity. If the cross-section is too small, it may not be able to meet the system's demand for the air supplement volume, resulting in insufficient air supplement and affecting the pressure balance and flue gas flow state inside the device; the cross-sectional area of the air supplement cylinder 5 affects the flue gas flow velocity. A reasonable cross-sectional area helps ensure that the flue gas flow velocity in the air supplement cylinder 5 is at an appropriate level, neither too high to cause an increase in turbulence and eddy current phenomena nor too low to affect the air supplement effect.

[0056] This setting helps improve the air supplement efficiency of the air supplement cylinder 5, maintain the internal pressure balance of the water seal device, ensure the efficient operation of the device, helps reduce the pressure drop of the flue gas in the water seal device, and improve the flow efficiency.

[0057] Specifically, the number of the air supplement cylinders 5 is at least one.

[0058] Multiple air supplement cylinders 5 connect the first branch pipe 3 and the second branch pipe 4, enabling the flue gas in the high-pressure area of the first branch pipe 3 to flow evenly to the low-pressure area in the second branch pipe 4, facilitating the adjustment of the flue gas flow velocity inside the air supplement cylinder 5 and meeting the requirements of the water seal device for the air supplement volume.

[0059] Preferably, the number of the air supplement cylinders 5 is 3.

[0060] Specifically, it further includes a guide vane 7. The guide vane 7 is arc-shaped, and the radius of curvature of the guide vane 7 is not less than the radius of the first branch pipe 3.

[0061] Since the radius of curvature of the guide vane 7 is not less than the radius of the first branch pipe 3, under the action of the arc-shaped guide vane 7, when the flue gas flows out of the range of the guide vane 7, the flowing direction of the flue gas forms an acute angle or a right angle with the flowing direction of the flue gas in the first branch pipe 3, reducing the interference between the flue gas adjacent to the guide vane 7 and the flue gas far from the guide vane 7 during the flue gas flow process.

[0062] This setting can change the flow state of the flue gas, make the flow velocity more uniform, helps reduce the eddy current and turbulence phenomena of the flue gas in the pipeline, reduce the flow loss, and improve the transmission efficiency of the flue gas.

[0063] Specifically, a guide vane 7 is arranged at the bottom of the first branch pipe 3. One end of the guide vane 7 is connected to the first branch pipe 3, and the other end extends to the second branch pipe 4.

[0064] After the high-speed flue gas enters the first branch pipe 3 from the first pipeline 1, it flows along the first branch pipe 3 until the bottom. A guide vane 7 is arranged at the bottom of the first branch pipe 3, separating the low-pressure backflow area at the lower part of the first branch pipe 3 from the main flow area, and the flue gas flows into the second branch pipe 4 along this guide vane 7.

[0065] This setting enables the flue gas to smoothly change the flow direction between the first branch pipe 3 and the second branch pipe 4, guiding the flue gas to smoothly enter the second branch pipe 4 from the first branch pipe 3, reducing the flue gas impact and energy loss caused by structural changes, and reducing the contribution of the bottom recirculation zone to the pressure drop; at the same time, it also helps to improve the structural strength and load-bearing capacity of the device and extend the service life.

[0066] Specifically, the deflector 7 is welded to the first branch pipe 3 and the deflector 7 is welded to the second branch pipe 4.

[0067] This installation method of the deflector 7 has the advantages of high strength and can withstand large loads. At the same time, this connection method has high reliability and can maintain a long-term connection state.

[0068] Specifically, a plurality of deflectors 7 are provided, and the deflectors 7 are evenly arranged in parallel in the first branch pipe 3.

[0069] This setting can better guide the flow direction of the high-speed flue gas, reduce the generation of turbulence and eddy currents, improve the uniformity of the high-speed flue gas distribution, reduce the wear of the high-speed flue gas on the pipe wall, reduce the pressure loss and energy consumption, and can significantly improve the operation efficiency and stability of the water seal device.

[0070] Specifically, the first pipe 1 is connected to the first branch pipe 3 in a way of expanding the diameter.

[0071] This expanded-diameter connection enables the diameter of the first pipe 1 to gradually increase when approaching the first branch pipe 3, realizing a smooth transition, which helps to reduce the turbulence and eddy current phenomena of the flue gas at the interface, reduce the flow resistance, and maintain the stable flow state of the flue gas; the expanded-diameter connection can also enhance the structural strength, avoid stress concentration at the part connection, enable the connection to better adapt to the pressure change, and prevent leakage or damage problems caused by pressure fluctuations.

[0072] Specifically, a small water seal 8 is provided on the outer side wall of the first branch pipe 3 for displaying the liquid level height in the first branch pipe 3.

[0073] When the liquid level in the water seal device rises, the water in the first branch pipe 3 flows into the small water seal 8. Since the first branch pipe 3 and the small water seal 8 form a similar U-shaped pipe structure, the liquid levels in the first branch pipe 3 and the small water seal 8 remain at the same height, and the operator can judge the liquid level height in the first branch pipe 3 from the liquid level height of the small water seal 8.

[0074] Specifically, the small water seal 8 is communicated with the first branch pipe 3 through a connecting pipe 9, and one ends of the three connecting pipes 9 are respectively connected in parallel to the top, middle and bottom of the small water seal 8.

[0075] This setting enables the small water seal 8 to be in a flowing state with the gas in the first branch pipe 3, maintaining the same air pressure. The liquid levels in the small water seal 8 and the first branch pipe 3 are at the same height, accurately indicating the liquid level height in the first branch pipe 3.

[0076] Embodiment 1

[0077] The first branch pipe 3 is connected to the first pipe 1 with an enlarged diameter, and the second branch pipe 4 is connected to the second pipe 2. The diameter of the second branch pipe 4 is D;

[0078] The air supplement cylinder 5 is arranged between the pipe walls of the first branch pipe 3 and the second branch pipe 4. The distance between the outlet end 501 of the air supplement cylinder 5 and the pipe wall of the first branch pipe 3 is D / 3. The angle between the flue gas flow direction and the axis of the air supplement cylinder 5 is 30°. The number of air supplement cylinders 5 is 3, and the total cross-sectional area of the air supplement cylinders 5 is equal to 3 / 20 of the cross-sectional area of the first pipe 1;

[0079] The flow hole 6 is arranged at the bottom of the first branch pipe 3 for the inlet and outlet of water for the water seal device;

[0080] A flow guide vane 7 is arranged at the bottom of the first branch pipe 3. One end of the flow guide vane 7 is connected to the first branch pipe 3, and the other end extends to the second branch pipe 4. The flow guide vane 7 is arc-shaped, and the radius of curvature of the flow guide vane 7 is equal to the radius of the first branch pipe 3;

[0081] The small water seal 8 is communicated with the first branch pipe 3 through a connecting pipe 9. One ends of the three connecting pipes 9 are respectively connected to the top, middle, and bottom of the small water seal 8 in parallel. An inlet and an overflow port are arranged on the side of the small water seal 8 away from the connecting pipe 9.

[0082] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A flue gas water seal device without an inner tube structure, used to connect a first pipeline (1) and a second pipeline (2), characterized in that: It comprises a first branch pipe (3), a second branch pipe (4), an air supply cylinder (5) and a flow hole (6), wherein the first branch pipe (3) and the second branch pipe (4) are connected to form a V-shaped structure; The first branch pipe (3) is connected to the first pipeline (1), and the second branch pipe (4) is connected to the second pipeline (2); The air supply cylinder (5) is arranged between the tube wall of the first branch pipe (3) and the tube wall of the second branch pipe (4), and is used to guide the high-pressure area of ​​the first branch pipe (3) into the low-pressure gas area of ​​the second branch pipe (4) to reduce flow resistance; The flow hole (6) is arranged at the bottom of the first branch pipe (3) and is used for water inlet and water outlet of the water sealing device.

2. The smoke water seal device without inner tube structure according to claim 1, characterized in that: The outlet end (501) of the air supplement cylinder (5) is arranged on the second branch pipe (4), and the outlet end (501) is arranged adjacent to point A.

3. The smoke water seal device without inner tube structure according to claim 2 is characterized in that: The diameter of the second branch pipe (4) is D, and the vertical distance between the outlet end (501) and the line AB is no more than 1 / 3D.

4. The smoke water seal device without inner tube structure according to claim 3 is characterized in that: The angle between the smoke flow direction in the first branch pipe (3) and the axis of the air supply cylinder (5) is less than 45°.

5. The smoke water seal device without inner tube structure according to claim 4 is characterized in that: The angle between the smoke flow direction in the first branch pipe (3) and the axis of the air supply cylinder (5) is 30°.

6. The smoke water seal device without inner tube structure according to claim 3, characterized in that: The number of the air-supplementing cylinder (5) is at least one, and the total cross-sectional area of ​​the air-supplementing cylinder (5) is greater than 1 / 10 and less than 1 / 5 of the cross-sectional area of ​​the first pipeline (1).

7. The smoke water seal device without inner tube structure according to claim 6, characterized in that: The number of the air replenishing cylinders (5) is 3.

8. The smoke water seal device without inner tube structure according to claim 1, characterized in that: It also comprises a guide plate (7), the guide plate (7) is arc-shaped, and the curvature radius of the guide plate (7) is not less than the radius of the first branch pipe (3).

9. The smoke water seal device without inner tube structure according to claim 8, characterized in that: The guide plate (7) is arranged at the bottom of the first branch pipe (3); one end of the guide plate (7) is connected to the first branch pipe (3), and the other end extends to the second branch pipe (4).

10. The smoke water seal device without inner tube structure according to claim 1, characterized in that: The first pipeline (1) and the first branch pipe (3) are connected in a diameter-expanding manner.

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