A multi-zone reactor with a multi-channel combined circulation annular shell

Abstract

The present invention relates to the technical field of petrochemical production equipment, and specifically to a multi-zone reactor with a multi-channel combined circulation ring shell, comprising a main cylinder and a sub-cylinder arranged vertically, the upper end side wall of the main cylinder is provided with a plurality of side interfaces, the plurality of side interfaces are evenly distributed around the longitudinal axis of the main cylinder, and the upper end of the sub-cylinder is provided with an upper interface; the plurality of side interfaces of the main cylinder and the upper interface of the sub-cylinder are respectively connected through different ring shells, and the ring shells are connected to the side interfaces of the main cylinder and extend laterally toward the direction of the sub-cylinder, then extend upward and bend, and then connect downward to the upper port of the sub-cylinder. This allows the fluidized materials in the plurality of ring shells to swirl along a section of the circumferential arc surface of the inner wall of the main cylinder after entering the plurality of side interfaces of the main cylinder, forming a more uniform reaction atmosphere in the inner cavity of the main cylinder, and the plurality of ring shells are more spatially symmetrical and more structurally stable than a single ring shell, and can reduce the vibration caused by the concentrated medium impacting the inner wall of the main cylinder during operation.

Description

Technical Field

[0001] The invention relates to the technical field of petrochemical production devices, and in particular to a multi-zone reactor with a multi-channel combined circulation ring shell. Background Art

[0002] Among the several production process technologies of polypropylene, there is a multi-zone circulation reactor that uses upper and lower connecting pipes to combine the lifting section and the settling section into an integrated multi-zone circulation reactor. During operation, the polymer particles in the reaction zone of the lifting section are entrained by the gas phase monomer provided by the fan and flow upward, and flow from bottom to top in the lifting zone of the high-speed fluidized bed. Then it enters the settling section through the upper connecting pipe. The fluid medium in the connecting pipe of the multi-zone circulation reactor is the circulating gas entrained polypropylene particles. The connecting pipe should comply with the relevant specifications and standards of pipelines and pressure vessels, and then meet the special requirements of the reactor. At the top of the settling zone, the polymer particles enter the reaction zone of the settling section after completing the gas-solid separation in the stripping zone. The polymer particles in the reaction zone of the settling section are subjected to the action of gravity to form a dense phase plunger and flow downward, and are discharged in the lower section; at the bottom of the reactor, the polymer is recycled into the reaction zone of the lifting section.

[0003] In recent years, as petrochemical plants have developed towards large-scale production, the volume of reactors has become larger and larger, and the height has become higher and higher. As the diameter of the container and the scale of production increase, the reaction process has a large amount of material flow and a fast medium flow rate, which is easy to cause vibration. According to actual production needs, the inventors designed the following Figure 1 The reactor shown has a structure comprising a first cylinder 01 and a second cylinder 02 arranged vertically and in parallel, a main interface being provided on the side wall of the upper end portion of the first cylinder 01, and a secondary interface being provided on the upper end portion of the second cylinder 02, the main interface of the first cylinder 01 and the secondary interface of the second cylinder 02 being connected via an annular shell 03, the annular shell 03 being connected to the main interface of the first cylinder 01 and then extending laterally away from the second cylinder 02, then extending upward to arch and bend, and then connecting downward to the upper port of the second cylinder 02.

[0004] The above single second cylinder 02 corresponds to an annular shell 03, and each side hole of the first cylinder 01 corresponds to a port of an annular shell 03. In this way, the medium flow in the single annular shell 03 is concentrated into the first cylinder 01 (sedimentation section). The phase friction formed by the swirl centrifugal force causes kinetic energy loss, and the circumferential distribution is uneven. During construction, the height of the first cylinder 01 needs to be increased, which increases the equipment cost. An annular shell 03 with a constant flow cross-section has a large cross-sectional radius in the structure. In order to meet the process requirements, the wall thickness of the annular shell needs to be thicker, which makes it inconvenient to purchase and manufacture materials. The bending radius of the structure is difficult to reduce, resulting in low flexibility, which is not suitable for high-rise structures to resist earthquakes and wind loads.

[0005] In addition, the upper connecting pipe is designed as a ring shell that interfaces with the first cylinder 01 from the side, which also brings about the following disadvantages:

[0006] 1. The eccentric connection makes the structure asymmetric, and strong support is needed to stabilize the towering structure. The single ring shell structure that meets large-scale production capacity has a larger diameter of the flow cross section, thicker wall thickness, strong rigidity, poor ability to resist vibration fatigue, and unstable structure;

[0007] 2. The eccentric asymmetric structure makes the medium of the whole device circulate in a concentrated manner, the degree of asymmetry is increased, and the vibration caused by the fast flow rate of the medium during operation is more obvious;

[0008] 3. Reactors with large production capacity require ring shells with larger diameters and thicker walls, which are difficult to process;

[0009] 4. The diameter of the ring shell of the side interface is large, the wall thickness is thick, and the rigidity is strong. During operation, the structural rigidity of the sedimentation section and its vertical stability are affected, which is not conducive to the uniform distribution of the medium;

[0010] 5. The large opening connecting the settlement area seriously weakens the strength of the cylinder, requiring the design of integral reinforcement cylinder sections and thick-walled forging pipes, which significantly increases the equipment cost;

[0011] 6. The flow rate of the gas-particle mixed medium entering the sedimentation section through a large annular shell is too large, and it is difficult to achieve a uniform state after a swirl cycle;

[0012] 7. Inconvenient for maintenance and protection.

[0013] In view of all or part of the above technical problems existing in the prior art, it is necessary to innovatively design a reactor to meet the above purpose requirements. Summary of the invention

[0014] In view of all or part of the above-mentioned technical problems existing in the prior art, the present invention provides a multi-zone reactor with a multi-channel combined circulation ring shell.

[0015] To achieve the above object, the present invention provides the following technical solutions:

[0016] Provided is a multi-zone reactor with a multi-channel combined circulation annular shell, comprising a main cylinder and an auxiliary cylinder arranged vertically, a secondary interface being provided on the top of the auxiliary cylinder, a main interface being provided on the upper end of the main cylinder, the main interface of the main cylinder and the auxiliary interface of the auxiliary cylinder being connected through two or more annular shells, and the ports of the two or more annular shells are distributed around the axis of the main cylinder.

[0017] Preferably, the main interface is a side port provided on the side wall at the upper end of the main cylinder body, the number of the side ports is more than two, and the more than two side ports are evenly distributed around the axis of the main cylinder body; each annular shell extends laterally after connecting to the side port of the main cylinder body, then extends upward to arch and bend, and then connects downward to the upper port of the auxiliary cylinder body.

[0018] Preferably, the number of the side ports of the main cylinder is two, and the number of the annular shells is two corresponding to the main interface; or the number of the side ports of the main cylinder is three, and the number of the annular shells is three corresponding to the main interface.

[0019] Preferably, a flange body is provided on the top of the main cylinder, a flange cover is provided at one end of the annular shell, the annular shell and the flange cover are connected by double-sided welding, the flange cover and the flange body are sealed and fixed, and the port of the annular shell penetrates into the flange body.

[0020] Preferably, a head is provided at the upper end of the main cylinder, and more than two swirl tubes are fixed to the inner wall of the head. The swirl tubes are arranged in a longitudinal spiral along the inner wall of the head. The port of the annular shell is connected to the upper port of the swirl tube, and the lower port of the swirl tube is arranged horizontally and close to the arc-shaped inner wall of the head.

[0021] Preferably, a bell mouth is welded vertically upward at the upper end of the swirl tube, the flared end of the bell mouth faces upward, and the annular shell is inserted into the bell mouth.

[0022] Preferably, the inner wall of the end cap is provided with a positioning card, and the swirl tube is fixed to the inner wall of the end cap by the positioning card.

[0023] Preferably, each cyclone tube comprises a cyclone main tube and a cyclone branch tube, the upper end of the cyclone main tube is connected to the annular shell, and the lower end of each cyclone main tube is connected to two or more cyclone branch tubes.

[0024] Preferably, the cross-sections of the swirl main pipe and the swirl branch pipe are non-circular.

[0025] Preferably, a support plate is provided at the arched and curved parts of the two or more annular shells, and the support plate is provided with a support hole for the annular shell to pass through, so as to clamp the two or more annular shells together.

[0026] Beneficial effects of the present invention:

[0027] Compared with the prior art, the multi-zone reactor with multi-channel combined circulation ring shell of the present invention has the following advantages:

[0028] 1) Between a single main cylinder and a single auxiliary cylinder, two or more annular shells disperse the medium flow entering the sedimentation section, avoiding the loss of kinetic energy caused by the phase friction formed by the centrifugal force of the swirl. While overcoming the uneven circumferential distribution, it can also reduce the cylinder height of the sedimentation section and reduce equipment costs;

[0029] 2) Compared with the traditional ring shell with equal flow cross-section, the two or more ring shells have a smaller cross-sectional radius and thinner wall thickness in structure, which is convenient for material procurement and manufacturing. The bending radius of the structure can be appropriately reduced, making it more flexible and more suitable for high-rise structures to resist earthquakes and wind loads;

[0030] 3) It is convenient to maintain the structural rigidity of the main cylinder and the auxiliary cylinder and their vertical stability, which is the key to ensure the axial symmetric and uniform distribution of the gas-solid two-phase flow medium in the reactor;

[0031] Further:

[0032] 4) Two or more ring shells are arranged separately from the main interface of the side and the main cylinder along the circumferential direction, which disperses the impact of the original single centralized circulation feed and can reduce the vibration caused by the fast flow rate of the medium in the ring shell during operation; and the degree of spatial symmetry is high, and most of the impact loads of the feed ports of each small ring shell can offset each other, making the structure more stable;

[0033] 5) Under the same production capacity, the ring shell cross-section structure size is reduced due to the increase in the number of ring shells, the ring shell flexibility is better, and it is also convenient for material procurement and manufacturing;

[0034] 6) A structure is added in which the annular shell connecting the main cylinder and the auxiliary cylinder is connected to the flange body and the flange cover at the top of the upper end of the main cylinder respectively. It is no longer necessary to open a hole on the side wall of this section of the main cylinder, thereby protecting the strength of the cylinder. It is no longer necessary to reinforce the wall of this section of the main cylinder by thickening it. Instead, it has a strengthening effect on the flange cover, thereby reducing equipment and engineering costs.

[0035] 7) After entering the multiple side interfaces of the main cylinder, the fluidized material in the annular shell can swirl along a section of the circumferential arc surface of the inner wall of the main cylinder, forming a more uniform reaction atmosphere in the inner cavity of the main cylinder. Compared with the traditional single annular shell, the multiple annular shells have a higher degree of spatial symmetry and a more stable structure, which can reduce the vibration caused by the concentrated medium impacting the inner wall of the main cylinder during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the structure of an existing reactor.

[0037] Figure 2 It is a schematic diagram of the structure of a multi-zone reactor with a multi-channel combined circulation ring shell in an embodiment.

[0038] Figure 3 It is a schematic diagram of the structure of the reactor with three ring shells in the embodiment.

[0039] Figure 4 It is a structural schematic diagram of another embodiment.

[0040] Figure 5 It is a schematic diagram of the connection between the main cylinder, flange body, flange cover and ring shell.

[0041] Figure 6 For Figure 5 The structural diagram of the swirl tube is added on the basis.

[0042] Figure 7 For Figure 5 Schematic diagram of the structure of adding a swirl branch pipe to the basic swirl pipe.

[0043] Reference numerals:

[0044] Figure 1 Reference numerals:

[0045] 01 first cylinder, 02 second cylinder, 03 annular shell;

[0046] Figure 2-7 Reference numerals:

[0047] Main cylinder 1, head 11, positioning card 12;

[0048] Auxiliary cylinder 2; annular shell 3; support plate 4;

[0049] Flange body 5, flange cover 6, sealing ring 7, bolt and nut assembly 8, swirl pipe 9, bell mouth 91, swirl main pipe 92, swirl branch pipe 93. DETAILED DESCRIPTION

[0050] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0051] The multi-zone reactor with multi-channel combined circulation shell of this embodiment is as follows: Figure 2 As shown, it includes a main cylinder 1 and a sub-cylinder 2 arranged vertically, a sub-interface is provided on the top of the sub-cylinder 2, and two side ports are provided on the side wall of the upper end of the main cylinder 1, which serve as the main interface. The main interface of the main cylinder 1 and the sub-interface of the sub-cylinder 2 are connected through two ring shells 3, and the ports of the two ring shells 3 are evenly distributed around the axis of the main cylinder 1. Each ring shell 3 is connected to the side port of the main cylinder 1 and then extends horizontally, then extends upward to bend and arch, and then connects downward to the upper port of the sub-cylinder 2.

[0052] Compared with the existing annular shell with only one equal flow cross-section, the two side opening areas of the side wall of the upper end of the main cylinder 1 corresponding to the two annular shells 3 between the single main cylinder 1 and the single auxiliary cylinder 2 are only half of the original size, which reduces the strength damage to the side wall of this section of the main cylinder 1, and does not need to be reinforced by thickening the wall thickness of this section of the main cylinder 1, thereby reducing equipment and engineering costs.

[0053] The number of the above-mentioned annular shells 3 is two, which are respectively connected to the two side openings of the side wall of the upper end of the main cylinder 1. The connection structure of the two annular shells 3 is a plane-symmetrical structure for the main cylinder 1, which can improve the structural stress. Figure 3 As shown, the number of the side ports of the main cylinder 1 is changed to three, and the number of the annular shells 3 is three corresponding to the main interfaces.

[0054] A support plate 4 is provided at the arched and curved part of the ring shell 3. The support plate is provided with a support hole for the ring shell 3 to pass through, so that two or more ring shells 3 are clamped together.

[0055] Another embodiment is Figures 4 to 7 As shown, the main interface of the main cylinder 1 is no longer opened on the side wall, but on the top. Specifically, a flange body 5 is provided on the top of the main cylinder 1, and a flange cover 6 is provided on one end of the annular shell 3. The annular shell 3 and the flange cover 6 are welded and connected by double-sided welding. The flange cover 6 and the flange body 5 are sealed and fixed by a sealing ring 7 and a bolt and nut assembly 8. The port of the annular shell 3 extends deep into the flange body 5. Compared with the opening connection with the side wall of the upper end of the main cylinder 1, the setting of the flange body 5 and the flange cover 6 reduces the strength damage to the side wall of the main cylinder 1 to zero, and it is no longer necessary to reinforce by thickening the wall thickness of the main cylinder 1. Instead, it has a strengthening effect on the flange cover 6, reducing equipment and engineering costs. Similarly, the top of the auxiliary cylinder 2 is also connected to the end of the annular shell 3 through a flange body and a flange cover, and the end of the annular shell 3 is inserted into the flange body at the top of the auxiliary cylinder 2.

[0056] In this embodiment, a head 11 is provided at the upper end of the main cylinder 1, and two or more swirl tubes 9 are fixed to the inner wall of the head 11. The swirl tubes 9 are arranged in a longitudinal spiral along the inner wall of the head 11, and the port of the annular shell 3 is connected to the upper port of the swirl tube 9, and the lower port of the swirl tube 9 is arranged horizontally and close to the arc-shaped inner wall of the head 11. Further, a bell mouth 91 is welded vertically upward at the upper end of the swirl tube 9, and the flared end of the bell mouth 91 faces upward, and the annular shell 3 is inserted into the bell mouth 91. A positioning card 12 is provided on the inner wall of the head 11, and the swirl tube 9 is fixed to the inner wall of the head 11 through the positioning card 12. Each swirl tube 9 includes a swirl main pipe 92 and a swirl branch pipe 93, the upper end of the swirl main pipe 92 is connected to the annular shell 3, and the lower end of each swirl main pipe 92 is connected to more than two of the swirl branch pipes 93. The cross-sections of the swirl main pipe 92 and the swirl branch pipe 93 are non-circular, and can be specifically elliptical, rectangular, and the like.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A multi-zone reactor with a multi-channel combined circulation annular shell, characterized in that: It comprises a main cylinder body and a sub-cylinder body arranged vertically, a sub-interface is arranged on the top of the sub-cylinder body, a main interface is arranged on the upper end of the main cylinder body, the main interface of the main cylinder body and the sub-interface of the sub-cylinder body are connected through two or more annular shells, and the ports of the two or more annular shells are distributed around the axis of the main cylinder body; the main interface of the main cylinder body is opened on the top of the main cylinder body, a head is arranged on the upper end of the main cylinder body, and two or more swirl tubes are fixed on the inner wall of the head, the swirl tubes are arranged longitudinally and spirally along the inner wall of the head, the port of the annular shell is connected with the upper port of the swirl tube, and the lower port of the swirl tube is arranged horizontally and close to the arc-shaped inner wall of the head.

2. A multi-zone reactor with a multi-channel combined circulation shell according to claim 1, characterized in that: A flange body is provided on the top of the cylinder, a flange cover is provided at one end of the annular shell, the annular shell and the flange cover are connected by double-sided welding, the flange cover and the flange body are sealed and fixed, and the port of the annular shell penetrates into the flange body.

3. The multi-zone reactor with a multi-channel combined circulation annular shell according to claim 1, characterized in that: A bell mouth is welded vertically upward at the upper end of the swirl tube, the expanded end of the bell mouth faces upward, and the ring shell is inserted into the bell mouth.

4. The multi-zone reactor with a multi-channel combined circulation annular shell according to claim 1, characterized in that: The inner wall of the end cap is provided with a positioning card, and the swirl tube is fixed to the inner wall of the end cap through the positioning card.

5. The multi-zone reactor with a multi-channel combined circulation annular shell according to claim 1, characterized in that: Each swirl pipe comprises a swirl main pipe and a swirl branch pipe. The upper end of the swirl main pipe is connected to the annular shell, and the lower end of each swirl main pipe is connected to more than two swirl branch pipes.

6. The multi-zone reactor with a multi-channel combined circulation annular shell according to claim 5, characterized in that: The cross sections of the swirl main pipe and the swirl branch pipe are non-circular.

7. The multi-zone reactor with a multi-channel combined circulation annular shell according to claim 1, characterized in that: A support plate is provided at the arched and bent parts of the two or more ring shells. The support plate is provided with a support hole for the ring shells to pass through, so that the two or more ring shells are clamped together.

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