External heat remover structure

Abstract

The utility model relates to the technical field of external heat collectors, and provides an external heat collector structure which comprises a lower cylinder and an upper shell, a plurality of central heat collecting tube bundles are arranged in the center of the lower cylinder, central fluidized air distributors are arranged at the lower ends of the central heat collecting tube bundles, a main heat exchange heat collecting tube bundle is arranged outside the central heat collecting tube bundles, and a plurality of heat collecting tube bundles are arranged outside the main heat exchange heat collecting tube bundle. The main heat exchange and extraction tube bundle and the central heat extraction tube bundle are mutually independent, the central heat extraction tube bundle is arranged at the upper end of the central heat extraction tube bundle, a central heat exchange tube bundle flange is arranged outside the central heat extraction tube bundle, and a catalyst outer circulation tube is arranged at the bottom of the central fluidized air distributor. A catalyst inlet / outlet is formed in the side surface of the upper shell, a hot catalyst hopper is arranged below the catalyst inlet / outlet, and a gas balance pipeline is mounted at the top of the upper shell. The heat taking load can be accurately controlled, and the heat exchange efficiency of the equipment is high.

Description

Technical Field

[0001] The utility model relates to the technical field of external heat exchangers, in particular to an external heat exchanger structure. Background Art

[0002] In petrochemical plants, the catalytic cracking unit is one of the important production equipment. In the catalytic cracking process, the regeneration and cooling of the catalyst requires efficient and flexible heat extraction equipment to support.

[0003] The existing external heat exchangers have deficiencies in adjusting the heat load, reducing fluidizing air backflow and entrainment, and improving heat exchange efficiency, and are difficult to meet the process requirements of flexibly adjusting the regenerator temperature and the reaction agent-oil ratio. Utility Model Content

[0004] In view of the above problems, the utility model provides an external heat exchanger structure.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is:

[0006] An external heat exchanger structure comprises a lower cylinder and an upper shell, wherein a plurality of central heat extraction tube bundles are arranged at the center of the lower cylinder, a central fluidizing air distributor is arranged at the lower end of the central heat extraction tube bundle, a main heat exchange tube bundle is arranged outside the central heat extraction tube bundle, the main heat exchange tube bundle and the central heat extraction tube bundle are independent of each other, a central heat tube bundle is arranged at the upper end of the central heat extraction tube bundle, a central heat exchange tube bundle flange is arranged outside the central heat extraction tube bundle, and a catalyst external circulation pipe is arranged at the bottom of the central fluidizing air distributor.

[0007] Preferably, a catalyst inlet and outlet are arranged on the side of the upper shell, a hot catalyst hopper is arranged below the catalyst inlet and outlet, and a gas balance pipeline is installed on the top of the upper shell.

[0008] Preferably, a fluidizing air distributor is provided inside the upper shell, a main heat exchange tube bundle is installed on the upper end of the fluidizing air distributor, and a main heat exchange tube bundle flange is installed outside the main heat exchange tube bundle.

[0009] Preferably, a water inlet pipeline is provided at the end of the main heat exchange tube bundle, and a water vapor outlet pipeline is provided on the outer wall of the main heat exchange tube bundle.

[0010] Preferably, a main heat exchange zone fluidizing air distributor is installed in the middle of the upper shell, and a main air inlet pipeline is arranged inside the main heat exchange zone fluidizing air distributor.

[0011] Preferably, a pressurized air inlet pipeline is provided in the middle of the central fluidizing air distributor, and a second regenerator and a first regenerator are provided below the hot catalyst hopper.

[0012] Preferably, a catalyst external circulation pipe is provided on the side of the lower cylinder.

[0013] The beneficial effects of the utility model are:

[0014] 1. The double heat extraction tube bundles with double flange structure can operate independently and accurately control the heat extraction load.

[0015] 2. The large and small shell design can effectively reduce the backflow and entrainment of the fluidizing air in the heat exchanger, and the equipment has high heat exchange efficiency.

[0016] 3. The main heat exchange area adopts main air fluidization to save operating costs. Simple catalyst cooling equipment can meet the process requirements of flexible adjustment of regenerator temperature and reaction agent-oil ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the first embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the second embodiment of the utility model;

[0019] In the figure: 1. Catalyst inlet and outlet; 2. Hot catalyst hopper; 3. Catalyst external circulation pipe; 4. Central fluidized air distributor; 5. Lower cylinder; 6. Central heat extraction tube bundle; 7. Fluidized air distributor in the main heat exchange area; 8. Upper shell; 9. Fluidized air distributor; 10. Main heat exchange tube bundle flange; 11. Main heat exchange tube bundle; 12. Central heat exchange tube bundle flange; 13. Central heat tube bundle; 14. Gas balance pipeline; 15. Water inlet pipeline; 16. Water vapor outlet pipeline; 17. Main air inlet pipeline; 18. Pressurized air inlet pipeline; 19. Second regenerator; 20. First regenerator. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, 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" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] Embodiment 1:

[0024] Reference Figure 1 An external heat exchanger structure includes a lower cylinder 5 and an upper shell 8. A plurality of central heat extraction tube bundles 6 are arranged at the center of the lower cylinder 5. A central fluidizing air distributor 4 is arranged at the lower end of the central heat extraction tube bundle 6. A main heat exchange tube bundle is arranged outside the central heat extraction tube bundle 6. The main heat exchange tube bundle and the central heat extraction tube bundle 6 are independent of each other. A central heat tube bundle 13 is arranged at the upper end of the central heat extraction tube bundle 6. A central heat exchange tube bundle flange 12 is arranged outside the central heat extraction tube bundle 6. A catalyst external circulation pipe 3 is arranged at the bottom of the central fluidizing air distributor 4.

[0025] The external heat exchanger adopts a large and small cylinder design, one as the main heat exchange area and the other as the auxiliary heat exchange area. The design of the lower cylinder 5 and the upper shell 8 can effectively reduce the backflow and entrainment of the fluidizing air and improve the heat exchange efficiency. The central heat extraction tube bundle 6 and the main heat exchange heat extraction tube bundle are respectively arranged in the lower cylinder 5 and the upper shell 8. Each group of heat extraction tube bundles adopts a double flange structure and can operate independently to achieve precise control of the heat extraction load.

[0026] Furthermore, a catalyst inlet and outlet 1 is provided on the side of the upper shell 8, a hot catalyst hopper 2 is provided below the catalyst inlet and outlet 1, a gas balance pipeline 14 is installed on the top of the upper shell 8, a fluidizing air distributor 9 is provided inside the upper shell 8, a main heat exchange tube bundle 11 is installed on the upper end of the fluidizing air distributor 9, a main heat exchange tube bundle 11 is installed on the outside of the main heat exchange tube bundle 11, a main heat exchange tube bundle flange 10 is installed, a water inlet pipeline 15 is provided at the end of the main heat exchange tube bundle 11, a water vapor outlet pipeline 16 is provided on the outer wall of the main heat exchange tube bundle 11, a main heat exchange zone fluidizing air distributor 7 is installed in the middle of the upper shell 8, a main air inlet pipeline 17 is provided inside the main heat exchange zone fluidizing air distributor 7, a boost air inlet pipeline 18 is provided in the middle of the central fluidizing air distributor 4, and a second regenerator 19 and a first regenerator 20 are provided below the hot catalyst hopper 2.

[0027] Two types of fluidizing air distributors are used, corresponding to the lower cylinder 5 and the upper shell 8 respectively. By adjusting the flow rate and distribution of the fluidizing air, the catalyst is uniformly fluidized in the lower cylinder 5 and the upper shell 8, and the heat exchange efficiency is improved. The gas balance pipeline connects the lower cylinder 5 and the upper shell 8 to balance the gas pressure between the two and ensure the uniform distribution of the fluidizing air in the lower cylinder 5 and the upper shell 8.

[0028] Embodiment 2:

[0029] Reference Figure 2 A catalyst external circulation pipe 3 is arranged on the side of the lower cylinder 5.

[0030] In summary, the present invention provides an efficient and flexibly adjustable external heat exchanger, which adopts innovative designs such as large and small cylinder designs, double heat extraction tube bundles, two fluidizing air distributors and gas balance pipelines, thereby achieving precise control of heat extraction load, reduction of fluidizing air backflow and entrainment, and improvement of heat exchange efficiency, thereby meeting the process requirements of flexible adjustment of regenerator temperature and reaction agent-oil ratio.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An external heat exchanger structure, characterized in that: The invention comprises a lower cylinder (5) and an upper shell (8), wherein a plurality of central heat extraction tube bundles (6) are arranged at the center of the lower cylinder (5), a central fluidizing air distributor (4) is arranged at the lower end of the central heat extraction tube bundle (6), a main heat exchange tube bundle is arranged outside the central heat extraction tube bundle (6), the main heat exchange tube bundle and the central heat extraction tube bundle (6) are independent of each other, a central heat extraction tube bundle (13) is arranged at the upper end of the central heat extraction tube bundle (6), a central heat exchange tube bundle flange (12) is arranged outside the central heat extraction tube bundle (6), and a catalyst external circulation tube (3) is arranged at the bottom of the central fluidizing air distributor (4).

2. The external heat exchanger structure according to claim 1, characterized in that: A catalyst inlet and outlet (1) is arranged on the side of the upper shell (8), a hot catalyst hopper (2) is arranged below the catalyst inlet and outlet (1), and a gas balance pipeline (14) is installed on the top of the upper shell (8).

3. An external heat exchanger structure according to claim 2, characterized in that: A fluidizing air distributor (9) is arranged inside the upper shell (8), a main heat exchange tube bundle (11) is installed at the upper end of the fluidizing air distributor (9), and a main heat exchange tube bundle flange (10) is installed outside the main heat exchange tube bundle (11).

4. The external heat exchanger structure according to claim 3, characterized in that: A water inlet pipeline (15) is provided at the end of the main heat exchange tube bundle (11), and a water vapor outlet pipeline (16) is provided on the outer wall of the main heat exchange tube bundle (11).

5. The external heat exchanger structure according to claim 4, characterized in that: A main heat exchange zone fluidizing air distributor (7) is installed in the middle of the upper shell (8), and a main air inlet pipeline (17) is arranged inside the main heat exchange zone fluidizing air distributor (7).

6. The external heat exchanger structure according to claim 5, characterized in that: A pressurized air inlet pipeline (18) is arranged in the middle of the central fluidizing air distributor (4), and a second regenerator (19) and a first regenerator (20) are arranged below the hot catalyst hopper (2).

7. The external heat exchanger structure according to claim 1, characterized in that: A catalyst external circulation pipe (3) is arranged on the side of the lower cylinder (5).

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