Reformate fractionator feed heater

Abstract

This invention provides a feed heater for a reforming oil fractionation tower, which improves the heating efficiency of reforming oil and ensures efficient and reliable fractionation operations in the subsequent reforming oil fractionation tower. It includes: a shell, which is a horizontal shell, sealed at one end and open at the other end along its length; a tube box, which serves as the tube-side feed and discharge tube box, the tube box being divided in the middle along its height direction by a partition plate to form a tube-side feed chamber and a tube-side discharge chamber, the tube-side feed chamber having a protruding tube-side inlet, and the tube-side discharge chamber having a protruding tube-side outlet; several tube bundles, each tube bundle being a U-shaped tube bundle; several baffles, including a central partition baffle, several first baffles, and several second baffles; and a tube sheet.

Description

Technical Field

[0001] This invention relates to the field of aromatic hydrocarbon complex structure technology, specifically to a reforming oil fractionation tower feed heater. Background Technology

[0002] Aromatics complexes are typically divided into five process units according to their flow: xylene fractionation, adsorption separation, isomerization, aromatics extraction and disproportionation, and alkyl transfer. The purpose of the xylene fractionation unit is to provide qualified aromatics feedstock for the aromatics extraction, disproportionation, alkyl transfer, and adsorption separation units through fractionation. The reformate distillation tower is the core equipment in the xylene fractionation unit. Its main function is to separate the C6 / C7 fraction from the C6+ reformate according to the extraction feed requirements. The remaining C8+ aromatics are sent to the xylene tower for further fractionation to meet the adsorption feed requirements.

[0003] When reformed oil enters the reformed oil fractionation tower, it needs to be heated by a heater. Existing reformed oil fractionation tower feed heaters require long heat exchange channels to meet the heating requirements of the reformed oil, resulting in low heating efficiency. Therefore, there is an urgent need to develop a reformed oil fractionation tower feed heater that can improve the heating efficiency of reformed oil. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a feed heater for a reforming oil fractionation tower, which improves the heating efficiency of the reforming oil and ensures efficient and reliable fractionation operations in the subsequent reforming oil fractionation tower.

[0005] A reforming oil fractionation tower feed heater, characterized in that it comprises: The shell is a horizontal shell, with one end sealed and the other end open along its length. The tube box is a tube-side inlet and outlet tube box. The tube box is divided into a tube-side inlet chamber and a tube-side outlet chamber by a partition plate in the middle of its height direction. The tube-side inlet chamber is provided with an outwardly protruding tube-side inlet port, and the tube-side outlet chamber is provided with an outwardly protruding tube-side outlet port. Several tube bundles, each of which is a U-shaped tube bundle; A plurality of baffles, including a central partition baffle, a plurality of first baffles, and a plurality of second baffles; And tube sheets; The upper part of the shell has shell-side gas inlets at both ends along its length, specifically a left-side gas inlet and a right-side gas inlet. The lower part of the shell has a shell-side liquid outlet in the middle along its length. The tube box is fixed to the open end of the shell via a tube sheet, and the tube box and the shell's cavity are arranged independently. The U-shaped tube bundle is arranged along the length of the shell, with its lower end penetrating the tube sheet and connecting to the tube-side inlet cavity, and its upper end penetrating the tube sheet and connecting to the tube-side outlet cavity. Two sets of shell-side gas inlets... The inlets are located at the upper regions of both ends of the U-shaped tube bundle along its length. The central baffle divides the shell into a left cavity and a right cavity along its length. The bottom of the shell, corresponding to the position of the central baffle, is the shell-side liquid outlet. The central baffle divides the shell-side liquid outlet into a left outlet and a right outlet. The first baffle and the second baffle are arranged independently along the length of the shell. The first baffle and the second baffle guide the shell-side medium in the left cavity and the right cavity in a single flow direction to the corresponding outlet.

[0006] Its further features are: The first baffle is a baffle with a notch on one side, and the second baffle is a baffle with a notch on the other side. This allows the shell-side medium on both sides to flow in an S-shape in the horizontal direction until it is blocked by the central dividing baffle and flows into the corresponding outlet on the lower side, ensuring that the shell-side medium fully heats the tube-side medium. The open end of the shell is a flange interface, the pipe box is provided with a corresponding flange structure, a tube sheet is provided between the flange interfaces of the shell and the pipe box, and they are reliably fixed together by the fastening bolts of the ring cloth. Both the left shell-side gas inlet and the right shell-side gas inlet are large-diameter inlets, and both the left shell-side gas inlet and the right shell-side gas inlet are equipped with anti-impact structures. Several anti-impact baffles are arranged below the left shell-side gas inlet to ensure reasonable and reliable flow of the shell-side medium. An anti-impact baffle is provided below the right shell-side gas inlet. The anti-impact baffle has openings to meet the inlet gas flow requirements and prevent the cross-sectional area at the shell-side inlet from being reduced due to the anti-impact baffle, which would cause a sudden increase in the flow velocity of the medium at the inlet due to the reduced flow rate, resulting in local pressure changes inside the shell-side. A bypass baffle is provided on the upper side of the baffle plate for top flow isolation. The baffle plate is also arranged with transverse intermediate baffles and longitudinal intermediate baffles connecting the baffle plate in the length direction interval of the U-shaped tube bundle, which ensures that the shell side medium flows fully and reliably. A left-side support plate is provided at the left end of the inner cavity of the shell. All U-shaped tube bundles pass through and are supported by the left-side support plate. Two support connectors are provided at the right end of all U-shaped tube bundles. The two support connectors reliably support the right end of all U-shaped tube bundles. The combination of the left-side support plate and the two support connectors is used to reduce the tube bundle vibration that may be caused by excessive U-shaped tube bundle span. A fixed saddle is provided at one bottom end along the length direction of the housing, and a sliding saddle is provided at the other bottom end along the length direction of the housing; The tube feed chamber is located at the bottom and is provided with a downwardly protruding tube feed port and a tube vent port. The tube discharge chamber is located at the top and is provided with an upwardly protruding tube discharge port and a tube drain port.

[0007] With this invention, reformed oil enters the tube-side feed chamber through the tube-side inlet, and then passes through the inner cavity of the shell along the U-shaped tube bundle through the feed end of the U-shaped tube bundle. High-flow-rate heat exchange gas flows independently into the left and right cavities of the shell cavity. Since the first and second baffles are independently arranged along the length of the shell, the first and second baffles guide the shell-side medium in the left and right cavities to the corresponding outlets in a single direction. This allows the heat exchange medium in the shell side on both sides to independently heat the reformed oil in the U-shaped tube bundle, which improves the heating efficiency of the reformed oil and ensures the efficient and reliable fractionation operation of the subsequent reformed oil fractionation tower. Attached Figure Description

[0008] Figure 1 This is a simplified schematic diagram of the front cross-sectional structure of the present invention; Figure 2 This is a simplified schematic diagram of the left view structure of the present invention; Figure 3 for Figure 1 A schematic diagram of the AA cross-section structure; Figure 4 This is a top view schematic diagram of the arrangement of the U-shaped tube bundle of the present invention; The names corresponding to the serial numbers in the diagram are as follows: 1. Anti-impact baffle; 2. Anti-impact baffle; 3. Bypass baffle; 4. Horizontal intermediate baffle; 5. Vertical intermediate baffle; 6. Left side support plate; 7. Support connector; 8. Insulation layer. Shell 10, left shell-side gas inlet 11, right shell-side gas inlet 12, shell-side liquid outlet 13, left cavity 101, right cavity 102, tube box 20, partition plate 21, tube-side inlet cavity 22, tube-side outlet cavity 23, tube-side inlet 24, tube-side outlet 25, tube-side vent 26, tube-side drain 27, U-shaped tube bundle 30, baffle plate 40, central partition baffle plate 41, first baffle plate 42, second baffle plate 43, tube sheet 50, fastening bolt 60, fixed saddle 70, sliding saddle 80. Detailed Implementation

[0009] See reformer feed heater. Figures 1-4 It includes a housing 10, a tube box 20, a plurality of tube bundles, a plurality of baffles 40, and a tube sheet 50; The shell 10 is a horizontal shell, with one end sealed and the other end open along its length. The tube box 20 is a tube-side inlet and outlet tube box. The tube box 20 is divided into a tube-side inlet chamber 22 and a tube-side outlet chamber 23 by a partition plate 21 in the middle of its height direction. The tube-side inlet chamber 22 is provided with an outwardly protruding tube-side inlet port 24, and the tube-side outlet chamber 23 is provided with an outwardly protruding tube-side outlet port 25. Each tube bundle is a U-shaped tube bundle 30; The plurality of baffles 40 include a central partition baffle 41, a plurality of first baffles 42, and a plurality of second baffles 43; Shell-side gas inlets are respectively provided at both ends of the upper length direction of the shell 10, specifically the left shell-side gas inlet 11 and the right shell-side gas inlet 12. A shell-side liquid outlet 13 is provided in the middle of the lower length direction of the shell 10. The tube box 20 is fixed to the open end of the shell 10 via the tube sheet 50, and the tube box 20 and the cavity of the shell 10 are arranged independently. A U-shaped tube bundle 30 is arranged along the length direction of the shell, with the lower end of the U-shaped tube bundle 30 penetrating the tube sheet 50 and connecting to the tube-side inlet cavity 22, and the upper end of the U-shaped tube bundle 30 penetrating the tube sheet 50 and connecting to the tube-side outlet cavity 23. The two sets of shell-side gas inlets are located at the U... The upper regions at both ends of the tube bundle 30 along its length are arranged with a central baffle 41 dividing the shell 10 into a left cavity 101 and a right cavity 102 along its length. The bottom of the shell 10, corresponding to the position of the central baffle 41, is the shell-side liquid outlet 13. The central baffle 41 divides the shell-side liquid outlet 13 into a left outlet and a right outlet. The first baffle 42 and the second baffle 43 are arranged independently along the length of the shell. The first baffle 42 and the second baffle 43 guide the shell-side medium in the left cavity 101 and the right cavity 102 to the corresponding side outlet in a single flow direction.

[0010] In a specific embodiment, the first baffle 42 is a baffle with a notch on one side and the second baffle 43 is a baffle with a notch on the other side, which allows the shell-side medium on both sides to flow in an S-shape in the horizontal direction until it is blocked by the central dividing baffle 41 and flows into the corresponding side outlet below, ensuring that the shell-side medium fully heats the tube-side medium. The open end of the shell 10 is a flange interface, and the pipe box 20 is provided with a corresponding flange structure. A tube sheet 50 is provided between the flange interfaces of the shell 10 and the pipe box 20, and is reliably fixed by the fastening bolts 60 of the ring cloth. Both the left shell-side gas inlet 11 and the right shell-side gas inlet 12 are large-diameter inlets, and both are equipped with anti-impact structures. Several anti-impact baffles 1 are arranged below the left shell-side gas inlet 11 to ensure reasonable and reliable flow of the shell-side medium. An anti-impact baffle 2 is provided below the right shell-side gas inlet 12. The anti-impact baffle 2 has openings to meet the inlet gas flow requirements and prevent the cross-sectional area at the shell-side inlet from being reduced due to the anti-impact baffle, which would cause a sudden increase in the flow velocity of the medium at the inlet due to the reduced flow rate, resulting in local pressure changes inside the shell-side. A bypass baffle 3 is provided on the upper side of the baffle plate 40 for top flow isolation. The baffle plate 40 is also provided with a transverse intermediate baffle 4 and a longitudinal intermediate baffle 5 that connect the baffle plates in the longitudinal direction of the U-shaped tube bundle 30, which ensures that the shell side medium flows fully and reliably.

[0011] In a specific embodiment, a left support plate 6 is provided at the left end of the inner cavity of the housing 10. All U-shaped tube bundles 30 are correspondingly passed through and supported on the left support plate 6. Two support connectors 7 are provided at the right end of all U-shaped tube bundles 30. The two support connectors 7 reliably support the right end of all U-shaped tube bundles 30. The combination of the left support plate 6 and the two support connectors 7 is used to reduce the tube bundle vibration that may be caused by excessive span of the U-shaped tube bundles 30.

[0012] In specific implementation, a fixed saddle 70 is provided at one end of the bottom of the housing 10 along its length, and a sliding saddle 80 is provided at the other end of the bottom of the housing 10 along its length.

[0013] In a specific embodiment, the tube feed chamber 22 is located at the lower part and is provided with a downwardly protruding tube feed port 24 and a tube vent port 26. The tube discharge chamber 23 is located at the upper part and is provided with an upwardly protruding tube discharge port 25 and a tube discharge port 27.

[0014] In practice, the outer periphery of the shell 10 also includes a heat insulation layer 8 to ensure that heating is sufficient and reliable.

[0015] Its working principle is as follows: Reformed oil enters the tube-side feed chamber through the tube-side inlet, and then passes through the inlet end of the U-shaped tube bundle along the inner cavity of the shell. Large flow rates of heat exchange gas flow independently into the left and right cavities of the shell cavity. Since the first and second baffles are independently arranged along the length of the shell, the first and second baffles guide the shell-side medium in the left and right cavities to the corresponding outlets in a single direction. This allows the heat exchange medium in the shell side to independently heat the reformed oil in the U-shaped tube bundle. After the heating gas is cooled into liquid, it flows out along the shell-side liquid outlet located at the bottom center.

[0016] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0017] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A feed heater for a reforming oil fractionation tower, characterized in that, It includes: The shell is a horizontal shell, with one end sealed and the other end open along its length. The tube box is a tube-side inlet and outlet tube box. The tube box is divided into a tube-side inlet chamber and a tube-side outlet chamber by a partition plate in the middle of its height direction. The tube-side inlet chamber is provided with an outwardly protruding tube-side inlet port, and the tube-side outlet chamber is provided with an outwardly protruding tube-side outlet port. Several tube bundles, each of which is a U-shaped tube bundle; A plurality of baffles, including a central partition baffle, a plurality of first baffles, and a plurality of second baffles; And tube sheets; The upper part of the shell has shell-side gas inlets at both ends along its length, specifically a left-side gas inlet and a right-side gas inlet. The lower part of the shell has a shell-side liquid outlet in the middle along its length. The tube box is fixed to the open end of the shell via a tube sheet, and the tube box and the shell's cavity are arranged independently. The U-shaped tube bundle is arranged along the length of the shell, with its lower end penetrating the tube sheet and connecting to the tube-side inlet cavity, and its upper end penetrating the tube sheet and connecting to the tube-side outlet cavity. Two sets of shell-side gas inlets... The inlets are located at the upper regions of both ends of the U-shaped tube bundle along its length. The central baffle divides the shell into a left cavity and a right cavity along its length. The bottom of the shell, corresponding to the position of the central baffle, is the shell-side liquid outlet. The central baffle divides the shell-side liquid outlet into a left outlet and a right outlet. The first baffle and the second baffle are arranged independently along the length of the shell. The first baffle and the second baffle guide the shell-side medium in the left cavity and the right cavity in a single flow direction to the corresponding outlet.

2. The reforming oil fractionation tower feed heater according to claim 1, characterized in that: The first baffle is a baffle with a notch on one side, and the second baffle is a baffle with a notch on the other side, which allows the shell-side medium on both sides to flow in an S-shape in the horizontal direction until it is blocked by the central dividing baffle and flows into the corresponding outlet on the lower side.

3. The reforming oil fractionation tower feed heater according to claim 1, characterized in that: The open end of the shell is a flange interface, the pipe box is provided with a corresponding flange structure, and a tube sheet is provided between the flange interfaces of the shell and the pipe box, and is reliably fixed by the fastening bolts of the ring cloth.

4. The reforming oil fractionation tower feed heater according to claim 1, characterized in that: Both the left and right shell-side gas inlets are large-diameter inlets, and both are equipped with anti-impact structures.

5. The reforming oil fractionation tower feed heater according to claim 4, characterized in that: Several anti-impact baffles are arranged below the gas inlet on the left side of the shell.

6. The reforming oil fractionation tower feed heater according to claim 4, characterized in that: An anti-impact baffle is provided below the right-side shell-side gas inlet, and the anti-impact baffle has openings.

7. The reforming oil fractionation tower feed heater according to claim 1, characterized in that: A bypass baffle is provided on the upper side of the baffle plate for top flow isolation. The baffle plate is also provided with transverse intermediate baffles and longitudinal intermediate baffles that connect the baffle plate in the length direction of the U-shaped tube bundle.

8. The reforming oil fractionation tower feed heater according to claim 1, characterized in that: A left-side support plate is provided at the left end of the inner cavity of the shell. All U-shaped tube bundles pass through and are supported by the left-side support plate. Two support connectors are provided at the right end of all U-shaped tube bundles. The two support connectors reliably support the right end of all U-shaped tube bundles.

9. The reforming oil fractionation tower feed heater according to claim 1, characterized in that: A fixed saddle is provided at one end of the bottom along the length direction of the housing, and a sliding saddle is provided at the other end along the length direction of the housing.

10. The reforming oil fractionation tower feed heater according to claim 1, characterized in that: The tube feed chamber is located at the bottom and is provided with a downwardly protruding tube feed port and a tube vent port. The tube discharge chamber is located at the top and is provided with an upwardly protruding tube discharge port and a tube drain port.

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