Sealing device for ethylene cracking furnace and flue gas recovery system

Abstract

The utility model discloses a sealing device and flue gas recovery system for ethylene cracking furnace, the sealing device comprises an operation pipe section, a first blocking part, a second blocking part and a connecting piece, the operation air enters between the first blocking part and the second blocking part to form an operation space, the operation air respectively exerts acting force on the first blocking part and the second blocking part, and the first blocking part and the second blocking part are connected through the connecting piece. And a sealing layer is formed in the operation space to limit the flowing of flue gas between the cracking furnace and the flue gas main pipe, so that the flue gas leakage can be effectively limited, the stability and the reliability of flue gas isolation are improved, and the flue gas cannot flow back into a hearth when the cracking furnace breaks down or needs to be shut down for maintenance, so that the safety of maintenance operation is improved. Meanwhile, due to the fact that smoke leakage is reduced, the efficiency of the smoke recovery system is improved, the problem that in the prior art, a smoke baffle on an ethylene device cannot stably isolate smoke is effectively solved, the smoke recovery efficiency and safety are improved, and meanwhile environmental pollution is reduced.

Description

Technical Field

[0001] This application relates to the field of flue gas treatment technology for ethylene cracking furnaces, and in particular to a sealing device and flue gas recovery system for ethylene cracking furnaces. Background Technology

[0002] In traditional ethylene production, the treatment of flue gas generated by cracking furnaces is a crucial step. Direct emission of this flue gas into the atmosphere not only causes environmental pollution but may also pose a threat to human health due to harmful substances within it. To improve environmental friendliness and resource utilization efficiency, modern ethylene plants increasingly employ flue gas recovery systems to reduce emissions and recover useful components such as carbon dioxide from the flue gas.

[0003] Currently, when sending flue gas from ethylene cracking furnaces to the carbon dioxide capture unit, the flue gas dampers between each cracking furnace and the main flue gas pipe are louvered flue gas dampers. Because these dampers have a certain leakage rate, there is a possibility of cross-contamination of flue gas when the dampers are closed. Furthermore, the dampers are mostly riveted and welded components; they are large, simple to manufacture, and inexpensive, and can be used in high-temperature flue gas environments. However, they also suffer from a relatively high leakage rate. When flue gas from multiple ethylene cracking furnaces is collected for treatment, if one cracking furnace malfunctions or shuts down, the flue gas leakage problem caused by the dampers cannot be effectively isolated. Flue gas may backflow into the furnace through the dampers, making it impossible to completely isolate the faulty furnace from the system, increasing safety risks. Utility Model Content

[0004] In view of the deficiencies in the prior art, this application provides a sealing device and flue gas recovery system for an ethylene cracking furnace to solve the problem that the flue gas dampers on ethylene plants in the prior art cannot stably isolate the flue gas.

[0005] The above-mentioned objectives of this application are mainly achieved through the following technical solutions:

[0006] A sealing device for an ethylene cracking furnace, the sealing device comprising:

[0007] The working pipe section is connected between the pyrolysis furnace and the flue gas main pipe and is used to guide the flue gas from the pyrolysis furnace into the flue gas main pipe.

[0008] The first baffle is movably disposed within the working pipe section and can be adjusted to different opening degrees to change the flow rate of the flue gas.

[0009] The second baffle is movably disposed within the working pipe section. The second baffle can be adjusted to different openings to change the flow rate of the flue gas. The second baffle is arranged at intervals from the first baffle to form a working space between the second baffle and the first baffle.

[0010] A connector is fixedly mounted on the working pipe section. One end of the connector is used to introduce working air, and the other end extends into the working space so that the working air enters the working space and applies force to the first baffle and the second baffle respectively. The working air forms a sealing layer in the working space to restrict the flue gas from communicating between the pyrolysis furnace and the flue gas main pipe.

[0011] In an optional embodiment, the first baffle includes a plurality of first baffles that are rotatable radially along the working pipe section, and adjacent first baffles have overlapping portions.

[0012] In an optional embodiment, the second baffle includes a plurality of second baffles that are rotatable radially along the working pipe section, and adjacent second baffles have overlapping portions.

[0013] In an optional embodiment, the rotation axes of the first baffle and the second baffle are arranged alternately.

[0014] In an optional embodiment, the first baffle and the second baffle can be rotated from a horizontal state to a vertical state, respectively.

[0015] In an optional embodiment, the working pipe section is provided with a drive unit, which is connected to the first stop and the second stop respectively. The drive unit is used to adjust the first stop and / or the second stop to switch to the target opening.

[0016] Based on the same inventive concept, this application also provides a flue gas recovery system for an ethylene cracking furnace. The flue gas recovery system includes a main flue gas pipe and a sealing device as described above. The working pipe section is connected between the main flue gas pipe and the cracking furnace. A carbon dioxide capture device is provided at the end of the main flue gas pipe away from the working pipe section.

[0017] In an optional embodiment, the flue gas recovery system further includes a pressure reducing component, which is connected to the side of the first baffle and the second baffle away from the working space, and is used to adjust the flow rate and pressure of the working air in the connecting member.

[0018] In an optional embodiment, the flue gas recovery system further includes an air compressor connected to the connector, the air compressor being used to introduce working air into the connector.

[0019] In an optional embodiment, the flue gas recovery system further includes a blower connected to the connector, the blower being used to introduce working air into the connector.

[0020] Compared with the prior art, the advantages of this application are:

[0021] The sealing device described in this application is used for isolating flue gas in an ethylene cracking furnace. The sealing device includes a working pipe section, a first baffle, a second baffle, and a connector. The working pipe section is connected between the cracking furnace and the main flue gas pipe, and is used to guide flue gas from the cracking furnace into the main flue gas pipe. The first baffle is movably disposed within the working pipe section and can be adjusted to different opening degrees to change the flue gas flow rate. The second baffle is also movably disposed within the working pipe section and can be adjusted to different opening degrees to change the flue gas flow rate. The second baffle and the first baffle are arranged alternately to form a working space between them. The connector is fixedly disposed on the working pipe section. One end of the connector is used to introduce working air, and the other end extends into the working space to allow the working air to enter the working space. Within the working space, forces are applied to the first and second baffles respectively. The working air forms a sealing layer within the working space to restrict the flow of flue gas between the pyrolysis furnace and the main flue gas pipe. The first and second baffles can be adjusted to different openings as needed to change the flue gas flow rate and meet operational control requirements. Working air introduced at one end of the connector enters the working space between the first and second baffles. When the first and second baffles are adjusted to their minimum openings, the working air applies forces to the first and second baffles respectively, forming a sealing layer within the working space to restrict the flow of flue gas between the pyrolysis furnace and the main flue gas pipe. This effectively limits flue gas leakage, improves the stability and reliability of flue gas isolation, and ensures that flue gas will not backflow into the furnace when the pyrolysis furnace malfunctions or needs to be shut down for maintenance, thereby improving the safety of maintenance operations. Simultaneously, by reducing flue gas leakage, the efficiency of the flue gas recovery system is improved, effectively solving the problem that flue gas baffles on ethylene plants in the prior art cannot stably isolate flue gas, improving the efficiency and safety of flue gas recovery, and also reducing environmental pollution. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the sealing device provided in the embodiments of this application;

[0024] Figure 2 A schematic diagram of the flue gas recovery system provided in the embodiments of this application;

[0025] In the diagram: 100, sealing device; 101, working pipe section; 102, working space; 200, first baffle; 201, first baffle plate; 300, second baffle; 301, second baffle plate; 401, connecting piece; 402, driving piece; 403, pressure reducing assembly; 501, pyrolysis furnace; 502, flue gas main pipe; 503, air compressor; 504, carbon dioxide capture device. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the description of these embodiments is intended to aid in understanding the present invention, but does not constitute a limitation thereof. The specific structural and functional details disclosed herein are only for describing exemplary embodiments of the present invention. However, the present invention may be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0027] like Figure 1 , Figure 2 As shown, Figure 1 This is a schematic diagram of the sealing device 100 provided in an embodiment of this application. Figure 2 This is a schematic diagram of a flue gas recovery system provided in an embodiment of this application; a sealing device 100 for an ethylene cracking furnace, the sealing device 100 including a working pipe section 101, a first baffle 200, a second baffle 300, and a connector 401, wherein:

[0028] like Figure 1 , Figure 2 As shown, the working pipe section 101 is connected between the pyrolysis furnace 501 and the flue gas main duct 502, and is used to guide the flue gas from the pyrolysis furnace 501 into the flue gas main duct 502. The working pipe section 101 is a key component connecting the pyrolysis furnace 501 and the flue gas main duct 502. The working pipe section 101 not only guides the flue gas from the pyrolysis furnace 501 to the flue gas main duct 502, but also provides installation space for the first baffle 200 and the second baffle 300. This effectively controls the flow path of the flue gas and facilitates the operation of the first baffle 200 and the second baffle 300.

[0029] like Figure 1 As shown, the first baffle 200 is movably disposed within the working pipe section 101, and the first baffle 200 can be adjusted to different opening degrees to change the flow rate of flue gas.

[0030] like Figure 1 As shown, the second baffle 300 is movably disposed within the working pipe section 101. The second baffle 300 can be adjusted to different openings to change the flow rate of the flue gas. The second baffle 300 and the first baffle 200 are arranged at intervals to form a working space 102 between the second baffle 300 and the first baffle 200.

[0031] The first baffle 200 and the second baffle 300 are movable and their opening can be adjusted as needed to change the flue gas flow rate. This allows the operator to flexibly control the flue gas velocity and flow rate according to the specific operating conditions of the ethylene cracking furnace 501 and the flue gas treatment requirements.

[0032] The second baffle 300 is arranged at intervals with the first baffle 200. The space between the second baffle 300 and the first baffle 200 forms the working space 102, which is the key area for achieving effective isolation of flue gas.

[0033] like Figure 1 As shown, the connector 401 is fixedly installed on the working pipe section 101. One end of the connector 401 is used to introduce working air, and the other end extends into the working space 102 so that the working air enters the working space 102 and applies force to the first baffle 200 and the second baffle 300 respectively. The working air forms a sealing layer in the working space 102 to restrict the communication between the pyrolysis furnace 501 and the flue gas main pipe 502.

[0034] The connector 401 is fixed to the working pipe section 101, with one end for introducing working air and the other end extending into the working space 102. The introduction of working air forms a sealing layer between the first baffle 200 and the second baffle 300. This sealing layer effectively restricts the flow of flue gas between the pyrolysis furnace 501 and the flue gas main duct 502, reducing leakage. The force of the working air not only forms the sealing layer but also applies pressure to the first baffle 200 and the second baffle 300, enhancing their sealing effect.

[0035] When the first baffle 200 and the second baffle 300 are adjusted to their minimum opening, the sealing layer formed between them by the working air restricts the flow of flue gas, effectively isolating the flue gas between the pyrolysis furnace 501 and the main flue gas pipe 502. In the event of a malfunction in the pyrolysis furnace 501 or a shutdown for maintenance, this ensures that flue gas will not backflow into the furnace, improving the safety of maintenance operations.

[0036] Because the sealing device 100 reduces flue gas leakage, the efficiency of the flue gas recovery system is improved. This not only improves resource utilization efficiency but also reduces environmental pollution.

[0037] By reducing flue gas leakage, the sealing device 100 helps reduce the emission of harmful substances, reduce the impact on the environment, and achieve a more environmentally friendly production process.

[0038] In an optional embodiment, the sealing device 100 of this application is used for the isolation of flue gas in the ethylene cracking furnace 501. The working principle of the sealing device 100 is as follows: the sealing device 100 includes a working pipe section 101, a first baffle 200, a second baffle 300, and a connector 401. The working pipe section 101 is connected between the cracking furnace 501 and the flue gas main duct 502 and is used to guide the flue gas from the cracking furnace 501 into the flue gas main duct 502. The first baffle 200 is movably disposed within the working pipe section 101. The first baffle 200 is adjustable to different opening degrees to change the flow rate of the flue gas. The second baffle 300 is movably disposed within the working pipe section 101. The second baffle 300 is also adjustable to different opening degrees to change the flow rate of the flue gas. The second baffle 300 and the first baffle 200 are arranged at intervals to form a working space 102 between them. The connector 401 is fixedly disposed on the working pipe section 101. One end of the connector 401 is used to introduce working air, and the other end extends... The working air is introduced into the working space 102, and forces are applied to the first baffle 200 and the second baffle 300 respectively. The working air forms a sealing layer in the working space 102 to restrict the flow of flue gas between the pyrolysis furnace 501 and the flue gas main duct 502. The first baffle 200 and the second baffle 300 can be adjusted to different openings as needed to change the flow rate of flue gas and meet the needs of operation control. The working air introduced at one end of the connector 401 enters the first baffle 200. A working space 102 is formed between the first baffle 200 and the second baffle 300. When the first baffle 200 and the second baffle 300 are adjusted to their minimum opening, the working air applies force to the first baffle 200 and the second baffle 300 respectively, forming a sealing layer within the working space 102. This restricts the flow of flue gas between the cracking furnace 501 and the flue gas main duct 502, effectively limiting flue gas leakage and improving the stability and reliability of flue gas isolation. This ensures that when the cracking furnace 501 malfunctions or needs to be shut down for maintenance, flue gas will not backflow into the furnace, thereby improving the safety of maintenance operations. Simultaneously, by reducing flue gas leakage, the efficiency of the flue gas recovery system is improved, effectively solving the problem that flue gas dampers on ethylene plants in the prior art cannot stably isolate flue gas, improving the efficiency and safety of flue gas recovery, and also reducing environmental pollution.

[0039] like Figure 1As shown, in an optional embodiment, the first baffle 200 includes a plurality of first baffles 201 that can rotate radially along the working pipe section 101, and adjacent first baffles 201 have overlapping portions.

[0040] The first baffle 200 is arranged as a plurality of first baffles 201 that can rotate radially along the working pipe section 101. The first baffles 201 can rotate to adjust the flow rate and direction of the flue gas. There is an overlapping part between adjacent first baffles 201, which enhances the sealing effect and reduces the possibility of flue gas leakage. The overlapping part can provide additional sealing protection to ensure that the flue gas does not escape.

[0041] like Figure 1 As shown, in an optional embodiment, the second baffle 300 includes a plurality of second baffles 301 that are rotatable radially along the working pipe section 101, and adjacent second baffles 301 have overlapping portions.

[0042] The second baffle 300 is arranged as a plurality of second baffles 301 that can rotate radially along the working pipe section 101. The second baffles 301 can rotate to adjust the flow rate and direction of the flue gas. There is an overlapping part between adjacent second baffles 301, which enhances the sealing effect and reduces the possibility of flue gas leakage. The overlapping part can provide additional sealing protection to ensure that the flue gas does not escape.

[0043] In an optional embodiment, the rotation axis of the first baffle 201 is staggered with the rotation axis of the second baffle 301.

[0044] The rotation axes of the first baffle 201 and the second baffle 301 are arranged in an alternating manner, allowing the first baffle 201 and the second baffle 301 to rotate on different planes and in different directions of rotation, thereby providing finer flow control and better sealing effect.

[0045] like Figure 1 As shown, in an optional embodiment, the first baffle 201 and the second baffle 301 can be rotated from a horizontal state to a vertical state, respectively, providing a continuous adjustment capability from fully open to fully closed, so that the operator can precisely control the flow rate of the flue gas as needed.

[0046] like Figure 1 As shown, in an optional embodiment, the working pipe section 101 is provided with a drive member 402, which is connected to the first stop 200 and the second stop 300 respectively. The drive member 402 is used to adjust the first stop 200 and / or the second stop 300 to switch to the target opening.

[0047] The working pipe section 101 is equipped with a drive unit 402 for adjusting the relative position of the first stop 200 and the second stop 300 to control the flue gas flow. The drive unit 402 can be electrically, pneumatically, or hydraulically driven, and the appropriate drive method can be selected according to the actual application requirements.

[0048] The drive unit 402 is connected to the first stop 200 and the second stop 300 respectively, so that the opening of the first stop 200 and the second stop 300 can be adjusted simultaneously or separately with a single operation. This simplifies the operation process and improves efficiency.

[0049] like Figure 1 , Figure 2 As shown, based on the same inventive concept, this application also provides a flue gas recovery system for an ethylene cracking furnace. The flue gas recovery system includes a main flue gas pipe 502 and a sealing device 100 as described above. A working pipe section 101 is connected between the main flue gas pipe 502 and the cracking furnace 501. A carbon dioxide capture device 504 is provided at the end of the main flue gas pipe 502 away from the working pipe section 101. The main flue gas pipe 502 is a channel connecting the cracking furnace 501 and the carbon dioxide capture device 504. The main flue gas pipe 502 collects flue gas from each cracking furnace 501 and transports it to the capture device for processing. The end of the main flue gas pipe 502 away from the working pipe section 101 is connected to the carbon dioxide capture device 504, which is responsible for capturing carbon dioxide from the flue gas, reducing greenhouse gas emissions.

[0050] Specifically, in this flue gas recovery system, except for the sealing device 100 and related components which adopt the technical solutions in the above embodiments, the structure, connection relationship, installation position, etc. of other devices can refer to the relevant disclosures in the prior art, and will not be elaborated here.

[0051] like Figure 1 , Figure 2 As shown, in an optional embodiment, the flue gas recovery system further includes a pressure reducing component 403, which is connected to the side of the first baffle 200 and the second baffle 300 away from the working space 102, and is used to adjust the flow rate and pressure of the working air in the connector 401.

[0052] To more precisely control the flow and pressure of the working air, the flue gas recovery system may include a pressure reducing assembly 403. The pressure reducing assembly 403 connects the first baffle 200 and the second baffle 300 to the side away from the working space 102, ensuring that the pressure and flow of the working air are properly regulated before entering the working space 102. The pressure reducing assembly 403 may be actually arranged as a pressure reducing valve.

[0053] like Figure 1 , Figure 2As shown, in an optional embodiment, the flue gas recovery system further includes an air compressor 503 connected to the connector 401, the air compressor 503 being used to introduce working air into the connector 401. The flue gas recovery system may include an air compressor 503 for introducing working air into the connector 401. The compressed air provided by the air compressor 503 can be used to form a sealing layer, improving the efficiency of flue gas isolation.

[0054] In an optional embodiment, the flue gas recovery system further includes a blower connected to the connector 401, the blower being used to introduce working air into the connector 401. In addition to the air compressor 503, the system may also include a blower for introducing working air into the connector 401. The blower can provide a continuous and stable airflow, enhancing the sealing effect.

[0055] It should be understood that the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Although the terms "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit, without departing from the scope of the exemplary embodiments of this utility model.

[0056] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0057] It should be understood that in the description of this utility model, the terms "upper," "vertical," "inner," "outer," etc., indicate the orientation or positional relationship when the disclosed product is used, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0058] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0059] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” “containing,” and / or “including” as used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, and do not exclude the presence or addition of one or more other features, quantities, steps, operations, units, components, and / or combinations thereof.

[0060] Specific details are provided in the following description to provide a complete understanding of the exemplary embodiments. However, those skilled in the art will understand that the exemplary embodiments can be implemented without these specific details. In other embodiments, well-known processes, structures, and techniques may be omitted in the depiction of non-essential details to avoid obscuring the exemplary embodiments.

[0061] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

[0062] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art.

Claims

1. A sealing device for an ethylene cracking furnace, characterized in that, The sealing device includes: The working pipe section is connected between the pyrolysis furnace and the flue gas main pipe and is used to guide the flue gas from the pyrolysis furnace into the flue gas main pipe. The first baffle is movably disposed within the working pipe section and can be adjusted to different opening degrees to change the flow rate of the flue gas. The second baffle is movably disposed within the working pipe section. The second baffle can be adjusted to different openings to change the flow rate of the flue gas. The second baffle is arranged at intervals from the first baffle to form a working space between the second baffle and the first baffle. A connector is fixedly mounted on the working pipe section. One end of the connector is used to introduce working air, and the other end extends into the working space so that the working air enters the working space and applies force to the first baffle and the second baffle respectively. The working air forms a sealing layer in the working space to restrict the flue gas from communicating between the pyrolysis furnace and the flue gas main pipe.

2. The sealing device for an ethylene cracking furnace as described in claim 1, characterized in that: The first baffle includes a plurality of first baffles that can rotate radially along the working pipe section, and adjacent first baffles have overlapping portions.

3. The sealing device for an ethylene cracking furnace as described in claim 2, characterized in that: The second baffle includes a plurality of second baffles that can rotate radially along the working pipe section, and adjacent second baffles have overlapping portions.

4. The sealing device for an ethylene cracking furnace as described in claim 3, characterized in that: The rotation axes of the first baffle and the second baffle are arranged alternately.

5. The sealing device for an ethylene cracking furnace as described in claim 3, characterized in that: The first baffle and the second baffle can be rotated from a horizontal state to a vertical state, respectively.

6. The sealing device for an ethylene cracking furnace as described in claim 1, characterized in that: The working pipe section is equipped with a driving component, which is connected to the first stop and the second stop respectively. The driving component is used to adjust the first stop and / or the second stop to switch to the target opening.

7. A flue gas recovery system for an ethylene cracking furnace, characterized in that: The flue gas recovery system includes a main flue gas pipe and a sealing device as described in any one of claims 1-6. The working pipe section is connected between the main flue gas pipe and the pyrolysis furnace. A carbon dioxide capture device is provided at the end of the main flue gas pipe away from the working pipe section.

8. The flue gas recovery system for an ethylene cracking furnace as described in claim 7, characterized in that: The flue gas recovery system also includes a pressure reducing component, which is connected to the side of the first baffle and the second baffle away from the working space, and is used to adjust the flow rate and pressure of the working air in the connecting member.

9. The flue gas recovery system for an ethylene cracking furnace as described in claim 7 or 8, characterized in that: The flue gas recovery system also includes an air compressor connected to the connector, the air compressor being used to introduce working air into the connector.

10. The flue gas recovery system for an ethylene cracking furnace as described in claim 7 or 8, characterized in that: The flue gas recovery system also includes a blower connected to the connector, the blower being used to introduce working air into the connector.

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