Conveying air mixer for catalyst pipeline

Abstract

The utility model discloses a conveying air mixer for a catalyst pipeline, which belongs to the technical field of flow mixers, and comprises a catalyst main pipe connected with a miter branch pipe communicated with the catalyst main pipe, and a conveying air pipe fitting detachably connected with the miter branch pipe. The air conveying pipe fitting comprises a connecting straight pipe and an elbow, the connecting straight pipe movably penetrates through the miter joint branch pipe and is detachably connected with the end of the miter joint branch pipe through a connecting piece, and at the moment, the end of the miter joint branch pipe is in a blocked state. One end of the elbow is connected with one end of the connecting straight pipe, and the other end of the elbow faces the same direction as the airflow direction in the catalyst main pipe. The flow mixer solves the problems that an existing flow mixer is large in occupied area, the abrasion speed of a catalyst main pipe is high, and replacement and maintenance are inconvenient.

Description

Technical Field

[0001] The utility model relates to the technical field of mixers, and particularly relates to a conveying air mixer for a catalyst pipeline. Background Art

[0002] Catalytic cracking is one of the petroleum refining processes, which is a process in which heavy oil undergoes cracking reactions under the action of heat and a catalyst to be transformed into cracked gas, gasoline, diesel, etc. The catalyst loading efficiency directly affects the start-up efficiency of the unit and the service life of the pipeline. The role of a catalyst mixer (mixer) is to provide conveying air for the catalyst loading pipeline, increase the flow rate of the medium in the pipeline, and thus improve the catalyst loading efficiency. A reasonable catalyst mixer can ensure that the catalyst is conveyed in a high-density, smooth, and stable state, thereby reducing abrasion and blockage problems, increasing the service life of the pipeline, and shortening the catalyst loading time.

[0003] Chinese Patent CN 206762689 U proposes a pipeline-type catalyst mixer. This pipeline-type catalyst mixer has a simple structure and does not require the setting of a mixing spiral shaft and spiral blades. Through two symmetrically arranged catalyst inlet pipes inclined on the side wall of the pipeline inlet, the catalyst enters the material pipeline at a certain initial velocity and at a certain angle to be mixed with the material. Through the pressure and the mutual flow mixing of the two catalyst streams, it is ensured that the material and the catalyst in the material pipeline are evenly mixed, achieving a good mixing effect. At the same time, it also plays a role in pushing the flow, ensuring the flow velocity after the material and the catalyst are mixed. However, this solution has the following disadvantages:

[0004] (1) The mixer needs to be provided with two branch inlets, which increases the difficulty of pipeline layout work, and the overall floor area is relatively large after installation;

[0005] (2) Although good mixing effects can be achieved by multi-channel counter-flow into the main pipe for mixing, it also increases the pipeline pressure drop at the inlet, and there is still a small amount of catalyst that will scour the wall of the main pipe, and the wall of the main pipe is abraded relatively quickly, with a short service life;

[0006] (3) The design of the mixer lacks detachable components. When the mixer is abraded and damaged, it needs to be cut and replaced as a whole, which is not conducive to the maintenance of the pipeline. Summary of the Utility Model

[0007] The utility model provides a conveying air mixer for a catalyst pipeline to solve the problems of large floor area, fast abrasion speed of the catalyst main pipe, and inconvenience in replacement and maintenance existing in the existing mixer.

[0008] To achieve the above object, the technical solution adopted by the utility model is:

[0009] A conveying air mixer for a catalyst pipeline, comprising a main catalyst pipe, the main catalyst pipe is connected with an obliquely connected branch pipe communicating therewith, and further comprising a conveying air pipe member detachably connected to the obliquely connected branch pipe; the conveying air pipe member comprises a connecting straight pipe and an elbow, the connecting straight pipe movably penetrates through the obliquely connected branch pipe, and is detachably connected to the end of the obliquely connected branch pipe through a connecting member. At this time, the end of the obliquely connected branch pipe is in a blocked state; the elbow is located in the main catalyst pipe, one end of which is connected to one end of the connecting straight pipe, and the orientation of the other end is the same as the air flow direction in the main catalyst pipe.

[0010] Further, the obliquely connected branch pipe and the main catalyst pipe are integrally formed or connected together by welding.

[0011] Further, the included angle α between the obliquely connected branch pipe and the main catalyst pipe is 15° to 75°.

[0012] Further, the connecting straight pipe and the obliquely connected branch pipe are coaxially arranged, and its outer diameter is smaller than the inner diameter of the obliquely connected branch pipe.

[0013] Further, a flow stabilizing straight pipe is connected to the end of the elbow away from the connecting straight pipe.

[0014] Further, the flow stabilizing straight pipe and the main catalyst pipe are coaxially arranged.

[0015] Further, the connecting member comprises a connecting flange and a perforated blind flange, the connecting flange is fixedly arranged at the end of the obliquely connected branch pipe away from the main catalyst pipe, the perforated blind flange is fixedly sleeved on the connecting straight pipe, and the connecting flange is detachably connected to the perforated blind flange through a plurality of stud bolts and a plurality of nuts.

[0016] Further, a gasket is arranged between the connecting flange and the perforated blind flange.

[0017] Further, a conveying air flange is arranged at the end of the connecting straight pipe away from the elbow.

[0018] Further, the distance between the conveying air flange and the perforated blind flange is at least 5 cm.

[0019] Due to the adoption of the above technical solutions, the utility model has the following beneficial effects:

[0020] The utility model is a brand-new solution to solve the problem that the conveying air in the catalytic cracking unit causes changes in the catalyst particle flow field, which in turn leads to pipeline erosion and abrasion. Compared with the prior art, the utility model has the following advantages: small installation space, the ability to reduce the erosion and abrasion degree of the catalyst main pipe, and easy replacement of vulnerable parts. The utility model only needs to set an inclined connecting branch pipe on the catalyst main pipe, which reduces the difficulty of pipeline layout work and has a relatively small overall floor area after installation. The conveying air pipe fitting is detachably connected to the inclined connecting branch pipe, which has the advantage of convenient disassembly and assembly. When the conveying air pipe fitting is damaged, it can be removed and replaced. The connecting straight pipe of the conveying air pipe fitting extends into the inclined connecting branch pipe and the catalyst main pipe, and the flow direction of the conveying air is changed through an elbow, so that the flow direction of the conveying air is consistent with the air flow direction in the catalyst main pipe, reducing and slowing down the abrasion speed of the inner wall of the catalyst main pipe, and avoiding the problem of fast abrasion speed of the inner wall of the catalyst main pipe caused by the change of the catalyst particle flow field by the conveying air. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the conveying air mixer proposed in the embodiment of the utility model;

[0022] Among them, the marks in the drawings are: 11 - inclined connecting branch pipe, 12 - connecting flange, 13 - catalyst main pipe, 21 - elbow, 22 - flow stabilizing straight pipe, 23 - perforated blind flange, 24 - conveying air flange, 25 - connecting straight pipe. Detailed Embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0024] Embodiment

[0025] As Figure 1 shown, a conveying air mixer for a catalyst pipeline includes a catalyst main pipe 13, and an inclined connecting branch pipe 11 communicated with the catalyst main pipe 13 is connected. The inclined connecting branch pipe 11 and the catalyst main pipe 13 are integrally formed or connected together by welding. The included angle α between the inclined connecting branch pipe 11 and the catalyst main pipe 13 is 15° - 75°. In this embodiment, the inclined connecting branch pipe 11 and the catalyst main pipe 13 are integrally formed, having good mechanical properties, and the included angle α between the inclined connecting branch pipe 11 and the catalyst main pipe 13 is 45°.

[0026] The conveying air mixer further includes a conveying air duct member detachably connected to the mitered branch pipe 11. The present utility model only needs to provide one mitered branch pipe 11 on the catalyst main pipe 13, which reduces the difficulty of pipeline layout work and has a relatively small overall floor area after installation. The conveying air duct member is detachably connected to the mitered branch pipe 11, having the advantage of convenient disassembly and assembly. When the conveying air duct member is damaged, it can be removed and replaced.

[0027] The conveying air duct member includes a connecting straight pipe 25 and an elbow 21. The connecting straight pipe 25 movably passes through the mitered branch pipe 11 and is detachably connected to the end of the mitered branch pipe 11 through a connecting member. At this time, the end of the mitered branch pipe 11 is in a blocked state. Among them, the connecting straight pipe 25 is coaxially arranged with the mitered branch pipe 11, and its outer diameter is smaller than the inner diameter of the mitered branch pipe 11, which is convenient for the disassembly and assembly of the connecting straight pipe 25.

[0028] The connecting member includes a connecting flange 12 and a perforated blind flange 23. The connecting flange 12 is fixedly arranged at the end of the mitered branch pipe 11 away from the catalyst main pipe, and the perforated blind flange 23 is fixedly sleeved on the connecting straight pipe 25. The connecting flange 12 is detachably connected to the perforated blind flange 23 through a plurality of stud bolts and a plurality of nuts. By connecting with stud bolts and nuts, the quick connection and separation of the connecting flange 12 and the perforated blind flange 23 can be realized, and then the quick disassembly and assembly of the connecting straight pipe 25 can be realized. In this embodiment, the connecting flange 12 is welded to the mitered branch pipe 11, the perforated blind flange 23 is welded to the connecting straight pipe 25, and a gasket is arranged between the connecting flange 12 and the perforated blind flange 23.

[0029] The elbow 21 is located inside the catalyst main pipe 13. One end of it is connected to one end of the connecting straight pipe 25, and the orientation of the other end is the same as the air flow direction inside the catalyst main pipe 13, that is, the turning angle of the elbow 21 is α. When the elbow 21 is abraded, first disconnect the connection between the connecting flange 12 and the perforated blind flange 23, then take out the connecting straight pipe 25 and the elbow 21 together, and finally replace with new spare parts, which can achieve quick maintenance.

[0030] A flow-stabilizing straight pipe 22 is connected to the end of the elbow 21 away from the connecting straight pipe 25. The flow-stabilizing straight pipe 22 is coaxially arranged with the catalyst main pipe 13 and is located at the central position of the catalyst main pipe 13, which is beneficial to the uniform mixing of the conveying air and the catalyst. The flow-stabilizing straight pipe 22 plays a role in guiding the conveying air. The flow-stabilizing straight pipe 22 only needs to be set for a short section, such as 1 - 3 cm, to avoid affecting the overall disassembly and assembly of the conveying air duct member due to too long a length.

[0031] The present utility model changes the flow direction of the conveying air through the elbow 21, so that the flow direction of the conveying air is consistent with the air flow direction inside the catalyst main pipe 13, reducing and slowing down the abrasion speed of the inner wall of the catalyst main pipe 13, and avoiding the problem of fast abrasion speed of the inner wall of the catalyst main pipe 13 caused by the change of the catalyst particle flow field by the conveying air.

[0032] One end of the connecting straight pipe 25 far away from the elbow 21 is provided with a conveying air flange 24, and the conveying air flange 24 is used to connect the conveying air pipeline flange. A gasket is arranged between the conveying air flange 24 and the conveying air pipeline flange, and they are detachably connected by a plurality of stud bolts and a plurality of nuts. The distance between the conveying air flange 24 and the punched blind flange 23 is at least 5 cm. Such a setting enables a certain distance to be maintained between the two, ensuring that the stud bolts respectively connected to the two can be normally disassembled.

[0033] In addition, in other embodiments, the catalyst main pipe 13 can be specially treated within a certain range above and below the elbow 21, such as spraying wear-resistant materials, lining wear-resistant materials, or increasing the wall thickness, etc., to improve the wear resistance. The materials of the catalyst main pipe 13, the connecting straight pipe 25, and the elbow 21 can be carbon steel, or alloy steel or stainless steel.

[0034] The above description is a detailed description of the preferred and feasible embodiments of the present invention, but the embodiments are not intended to limit the patent application scope of the present invention. Any equivalent changes or modified variations completed under the technical spirit prompted by the present invention shall fall within the patent scope covered by the present invention.

Claims

1. A conveying air mixer for a catalyst pipeline, comprising a catalyst main pipe (13), wherein the catalyst main pipe (13) is connected to a mitered branch pipe (11) communicating therewith, characterized in that: It also comprises a conveying air duct member detachably connected to the mitered branch pipe (11); the conveying air duct member comprises a connecting straight pipe (25) and an elbow (21); the connecting straight pipe (25) movably passes through the mitered branch pipe (11) and is detachably connected to the end of the mitered branch pipe (11) through a connecting member, at which time the end of the mitered branch pipe (11) is in a blocked state; the elbow (21) is located in the catalyst main pipe (13), one end of which is connected to one end of the connecting straight pipe (25), and the other end is oriented in the same direction as the airflow in the catalyst main pipe (13).

2. The conveying air mixer for a catalyst pipeline according to claim 1, characterized in that: The mitered branch pipe (11) and the catalyst main pipe (13) are integrally formed or connected together by welding.

3. The conveying air mixer for a catalyst pipeline according to claim 1, characterized in that: The angle α between the beveled branch pipe (11) and the catalyst main pipe (13) is 15° to 75°.

4. A conveying air mixer for a catalyst pipeline according to claim 3, characterized in that: The connecting straight pipe (25) is coaxially arranged with the miter branch pipe (11), and its outer diameter is smaller than the inner diameter of the miter branch pipe (11).

5. The conveying air mixer for a catalyst pipeline according to claim 1, characterized in that: One end of the elbow (21) away from the connecting straight pipe (25) is connected to a flow-stabilizing straight pipe (22).

6. A conveying air mixer for a catalyst pipeline according to claim 5, characterized in that: The flow stabilizing straight pipe (22) is coaxially arranged with the catalyst main pipe (13).

7. The conveying air mixer for a catalyst pipeline according to claim 1, characterized in that: The connecting piece comprises a connecting flange (12) and a perforated blind flange (23), wherein the connecting flange (12) is fixedly arranged at an end of the mitered branch pipe (11) away from an end of the catalyst main pipe, and the perforated blind flange (23) is fixedly sleeved on the connecting straight pipe (25), and the connecting flange (12) is detachably connected to the perforated blind flange (23) via a plurality of studs and a plurality of nuts.

8. The conveying air mixer for a catalyst pipeline according to claim 7, characterized in that: A gasket is arranged between the connecting flange (12) and the perforated blind flange (23).

9. The conveying air mixer for a catalyst pipeline according to claim 7, characterized in that: An air conveying flange (24) is provided at one end of the connecting straight pipe (25) away from the elbow (21).

10. A conveying air mixer for a catalyst pipeline according to claim 9, characterized in that: The distance between the air conveying flange (24) and the perforated blind flange (23) is at least 5 cm.

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