A multi-inlet jacketed pipe connector and a heat exchanger having the same

Abstract

The utility model relates to the technical field of petrochemical equipment, and specifically to a multi-inlet jacketed pipe connector and a heat exchanger with the same, comprising a lower central tube and an inlet outer tube, a lower annular channel with a bottom seal formed between the lower central tube and the inlet outer tube, a side wall of the inlet outer tube is provided with a medium introduction pipe, which comprises a main introduction pipe and an auxiliary introduction pipe, and the inner wall of the main introduction pipe is arranged partially tangent to the inner wall of the inlet outer tube. The bidirectional arrangement of the medium introduction pipe can introduce two media, one main and one auxiliary, which mutually reinforce the spiral flow state after entering the jacket in both directions, flow in the same direction, and the two media are quickly mixed, and it is convenient for the auxiliary medium to timely adjust the main process medium to the optimized jacket medium required by the lower central tube, thereby improving the stability of the jacketed tube heat exchanger and maintaining the stability of the main process medium flow. The lower central tube is provided with a swirl sheet for spirally guiding the medium therein, so that the medium in the tube and the jacket medium produce reverse swirls, thereby strengthening the heat exchange effect between the medium in the tube and the jacket medium.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical equipment, in particular to a jacketed pipe connector with multiple inlets and a heat exchanger with the same. Background Art

[0002] The linear quench heat exchanger is mainly composed of an inlet connector, a double-tube heat exchange element, a cooling medium connector, an outlet connector, a water vapor header, a high-temperature medium header, a hydraulic coke removal hole, etc. Based on this, the structure of the linear quench heat exchanger is as follows: Each double-tube heat exchange element is composed of two concentric tubes, wherein the inner tube (tube side) carries the high-temperature medium - cracked gas at about 800°C, and the annular gap (shell side or jacket) between the outer tube and the inner tube carries the cooling medium - a water vapor mixture at about 350°C. Each double-tube heat exchange element is connected to the outlet furnace tube of the cracking furnace through the inlet connector, and the double-tube heat exchange elements are arranged in parallel in a single row or double row, and are connected together through a water vapor header and a high-temperature medium header to form a linear quench heat exchanger.

[0003] The inlet connector previously developed by the applicant is a jacket anti-solid deposition structure of a shell and tube heat exchanger disclosed in the Chinese patent document with announcement number CN216385198U, which includes an inner sleeve, an outer sleeve, an inlet connector and an outlet connector. The inner sleeve is concentrically inserted into the outer sleeve, and an annular jacket channel is formed between the outer wall of the inner sleeve and the inner wall of the outer sleeve; the bottom of the lower annular channel is an inclined surface that gradually increases in the direction away from the cooling medium inlet pipe. During operation, the cooling water flowing in from the cooling medium inlet pipe will flow around the annular space and meet and intersect at the opposite side. Since the place is higher, it can be drained to form an upward component, which can avoid the cooling medium static zone that appears at the position opposite to the inlet, making it difficult for solid suspended matter to deposit and accumulate at this place, thereby avoiding the defect of solid impurities depositing the cooling medium at this position. The structure is simple and the manufacturing cost is low, and it is suitable for various shell and tube heat exchanger equipment.

[0004] The above inlet connector has only a single cooling medium introduction pipe, that is, only a single type / temperature of medium can flow into the annular jacket per unit time, which is not convenient for adjustment. Furthermore, the medium flowing in from the lower center inner tube flows upward, basically along the axial direction, and the heat exchange effect between the medium in the lower annular channel and the wall of the lower center tube needs to be improved. Summary of the invention

[0005] In view of the above technical problems existing in the prior art, the utility model provides a multi-inlet jacket pipe connector and a heat exchanger with the same.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] Provided is a multi-inlet jacket pipe connector, comprising a lower central pipe and an inlet outer pipe, wherein the lower central pipe is located in the inlet outer pipe, a lower annular channel with a bottom sealed is formed between the lower central pipe and the inlet outer pipe, and a medium introduction pipe communicating with the lower annular channel is provided on the side wall of the inlet outer pipe, wherein:

[0008] The medium introduction pipe includes a main introduction pipe and an auxiliary introduction pipe. The axis of the main introduction pipe is staggered with the axis of the inlet outer pipe, and the inner wall of the main introduction pipe is partially tangent to the inner wall of the inlet outer pipe, so that the medium in the main introduction pipe enters the lower annular channel and flows in a spiral. The lower center pipe is provided with a swirl sheet for spirally guiding the medium therein.

[0009] As a further optional solution, the axis of the auxiliary inlet pipe is staggered with the axis of the inlet outer pipe, and the inner wall of the main inlet pipe is partially tangent to the inner wall of the inlet outer pipe.

[0010] As a further optional solution, the main inlet pipe and the auxiliary inlet pipe are arranged in the same rotation direction.

[0011] As a further optional solution, the inner diameters of the main inlet pipe and the auxiliary inlet pipe are equal, or the inner diameter of the main inlet pipe is larger than the inner diameter of the auxiliary inlet pipe.

[0012] As a further optional solution, the main inlet pipe and the auxiliary inlet pipe are both arranged vertically relative to the inlet outer pipe.

[0013] As a further optional solution, the main inlet pipe and the swirl plates are arranged in such a way that the medium in the lower central pipe and the medium in the lower annular channel flow in the same direction or flow in the opposite direction.

[0014] As a further optional solution, the radial cross-section of the main introduction pipe is circular, elliptical or oblong.

[0015] As a further optional solution, the bottom of the lower annular channel is a spiral climbing slope, and the main inlet pipe is connected to the lower position of the slope; or the bottom of the lower annular channel is an isotropic surface, and the inner walls of the main inlet pipe and the auxiliary inlet pipe are arranged flush with the climbing surface.

[0016] As a further optional solution, the central tube and the inlet outer tube are an integrated casting structure; and / or the swirl plate and the lower central tube are an integrated casting structure.

[0017] The utility model also provides a heat exchanger, which is characterized in that it includes an inner sleeve, an outer sleeve and any one of the above-mentioned multi-inlet jacket pipe connectors, the inner sleeve is concentrically inserted into the outer sleeve, and an annular jacket channel is formed between the outer wall of the inner sleeve and the inner wall of the outer sleeve; the upper end of the lower center pipe is welded to fix the lower end of the inner sleeve, and the inlet outer pipe is welded to fix the lower end of the outer sleeve; the inner sleeve and the outer sleeve are straight pipes or curved pipes.

[0018] Beneficial effects of the utility model:

[0019] The utility model discloses a multi-inlet jacketed tube connector and a heat exchanger with the same. Since the medium introduction pipe comprises a main introduction pipe and an auxiliary introduction pipe, two kinds of media, one main and one auxiliary, can be introduced, so that the auxiliary medium can timely adjust the main process medium into the optimized jacket medium required by the lower central tube, so that the main process medium can continuously maintain stable process operation, improve the stability of the jacketed tube heat exchanger, and maintain the stability of the main process medium flow.

[0020] Furthermore, when the main inlet pipe and the auxiliary inlet pipe are arranged in the same rotation direction, the two media enter the jacket in both directions and reinforce the spiral flow state, flow in the same direction, and mix the two media rapidly.

[0021] Furthermore, the swirl sheet in the central inner tube makes the medium in the tube swirl. If the swirl sheet makes the medium in the lower central tube and the medium in the lower annular channel swirl in opposite directions, the heat exchange effect between the medium in the tube and the medium in the jacket can be enhanced. If the swirl sheet makes the medium in the lower central tube and the medium in the lower annular channel flow in the same direction, the synergistic heat exchange between the medium in the tube and the medium in the jacket can be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the heat exchanger in the embodiment.

[0023] Figure 2 This is a plan view of the inlet connector of Example 1.

[0024] Figure 3 for Figure 2 A cross-sectional view with AA as the section.

[0025] Figure 4 It is a three-dimensional diagram of the inlet connector of the first embodiment.

[0026] Figure 5 It is a plan view of the inlet connector of the second embodiment.

[0027] Figure 6 It is a three-dimensional diagram of the inlet connector of the third embodiment.

[0028] Reference numerals:

[0029] Inner casing 1, outer casing 2, jacket channel 3;

[0030] Inlet connector 4, lower center pipe 41, inlet outer pipe 42, diameter expansion section 421, connecting pipe section 422, conical transition section 423, lower annular channel 43, medium introduction pipe 44, main introduction pipe 441, auxiliary introduction pipe 442;

[0031] Outlet connector 5, upper center pipe 51, outlet outer pipe 52, upper annular channel 53, medium outlet pipe 54;

[0032] Swirl sheet 6. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0034] The heat exchanger of this embodiment, such as Figure 1 As shown, it is a quench heat exchanger, including an inner sleeve 1, an outer sleeve 2, an outlet connector 5 and an inlet connector 4. The inner sleeve 1 is concentrically inserted into the outer sleeve 2, and an annular jacket channel 3 is formed between the outer wall of the inner sleeve 1 and the inner wall of the outer sleeve 2. The inlet connector 4 includes a lower central tube 41 and an inlet outer tube 42. The lower central tube 41 is located in the inlet outer tube 42, and a lower annular channel 43 with a bottom sealed is formed between the lower central tube 41 and the inlet outer tube 42. The upper end of the lower central tube 41 is welded to the lower end of the inner sleeve 1, and the inlet outer tube 42 is welded to the lower end of the outer sleeve 2. The side wall of the inlet outer tube 42 is provided with a medium introduction pipe 44 connected to the lower annular channel 43. Similarly, the outlet connector 5 includes an upper central tube 51 and an outlet outer tube 52. The upper central tube 51 is welded to the upper end of the inner sleeve 1 and is inserted into the outlet outer tube 52. An upper annular channel 53 with a top seal is formed between the upper central tube 51 and the outlet outer tube 52. The outlet outer tube 52 is welded to the upper end of the outer sleeve 2 and is connected to a medium outlet tube 54. The above is a conventional structure of an existing quench heat exchanger, and this embodiment also retains these basic structures.

[0035] The core improvement of this embodiment is that, in combination with 2 to Figure 4As shown, the inlet connector 4 is a multi-inlet jacketed tube connector, and the medium introduction pipe 44 includes a main introduction pipe 441 and an auxiliary introduction pipe 442, which can introduce two kinds of media, one main and one auxiliary, so that the auxiliary medium can timely adjust the main process medium to the optimized jacket medium required by the lower central tube 41, so that the main process medium can continuously maintain stable process operation, improve the stability of the jacketed tube heat exchanger, and maintain the stability of the main process medium flow. The main introduction pipe 441 and the auxiliary introduction pipe 442 are both arranged vertically relative to the inlet outer tube 42. The axis of the main introduction pipe 441 is staggered with the axis of the inlet outer tube 42, and the inner wall of the main introduction pipe 441 is partially tangent to the inner wall of the inlet outer tube 42, so that the medium of the main introduction pipe 441 enters the lower annular channel 43 and flows in a spiral manner. In practice, a spiral groove formed by an inward concave can be set on the inner wall of the inlet outer tube 42 to enhance the spiral effect in the jacket. Similar to the main inlet pipe 441, the axis of the auxiliary inlet pipe 442 is staggered with the axis of the inlet outer pipe 42, and the inner wall of the main inlet pipe 441 is partially tangent to the inner wall of the inlet outer pipe 42. The main inlet pipe 441 and the auxiliary inlet pipe 442 are arranged in the same rotation direction. After the two media enter the jacket in both directions, the spiral flow state is strengthened and the two media flow in the same direction, and the two media are quickly mixed. Of course, in practice, it is not preferred to change the auxiliary inlet pipe 442 to align the axis of the inlet outer pipe 42 in the center, but its flow rate is as small as possible from the main inlet pipe 441 to ensure that the medium in the lower annular channel 43 maintains spiral flow.

[0036] In this embodiment, the inner diameters of the main inlet pipe 441 and the auxiliary inlet pipe 442 are equal. In practice, the inner diameter of the main inlet pipe 441 can be larger than that of the auxiliary inlet pipe 442, and the flow rates of the two media can be changed by pipe diameter and flow rate.

[0037] It should be noted that the "multiple entrances" claimed in this embodiment are not a limit to the number, but are relative to the existing single entrance.

[0038] In this embodiment, the lower center tube 41 is provided with a swirl sheet 6 for spirally guiding the medium therein. The main inlet pipe 441 and the swirl sheet 6 are arranged in such a way that the medium in the lower center tube 41 and the medium in the lower annular channel 43 flow in the same direction or flow in the opposite direction. If the swirl sheet 6 causes the medium in the lower center tube 41 and the medium in the lower annular channel 43 to swirl in opposite directions, the heat exchange effect between the medium in the tube and the medium in the jacket can be enhanced. If the swirl sheet 6 causes the medium in the lower center tube 41 and the medium in the lower annular channel 43 to flow in the same direction, the coordinated heat exchange between the medium in the tube and the medium in the jacket can be enhanced. Both countercurrent and downstream have their advantages.

[0039] In practice, the radial cross-sections of the main inlet pipe 441 and the auxiliary inlet pipe 442 are circular, elliptical or oblong. The central pipe and the inlet outer pipe 42 are integrally cast structures; and / or the swirl blades 6 and the lower central pipe 41 are integrally cast structures.

[0040] In this embodiment, the bottom of the lower annular channel 43 is a level surface, and the inner walls of the main inlet pipe 441 and the auxiliary inlet pipe 442 are arranged flush with the level surface. Figure 5 As shown, the bottom of the lower annular channel 43 is a spirally ascending inclined surface, and the main inlet pipe 441 is connected to the lower position of the inclined surface, which can push the solid impurities spirally upward to avoid the precipitation of the solid impurities. There is no need to set up a normally closed sewage pipe separately, saving manufacturing costs and work efficiency.

[0041] Another embodiment of the inlet connection piece, such as Figure 6 As shown, the inlet outer pipe 42 includes an expanded diameter section 421 and a connecting pipe section 422 from bottom to top, the inner diameter of the expanded diameter section 421 is larger than the inner diameter of the connecting pipe section 422, the jacket medium introduction pipe 44 is connected to the expanded diameter section 421, and the connecting pipe section 422 is connected to the inner sleeve 1. After the cooling medium enters the lower annular channel 43, there is a large space, the medium flow is large, and solid deposition is further prevented. A conical transition section 423 is provided between the expanded diameter section 421 and the connecting pipe section 422.

[0042] This embodiment illustrates a multi-inlet jacket pipe connector applied to a quench heat exchanger. In practice, the jacket pipe connector can be applied to a series tube reactor, such as the basic structure of a series tube reactor disclosed in the Chinese patent document with publication number CN219984695U, that is, "comprising a plurality of straight sleeves, curved sleeves and jacket connecting pipes, each straight sleeve comprising an inner pipe and an outer pipe, the inner pipe being inserted into the outer pipe to form an annular straight jacket flow channel; each curved sleeve comprising an outer elbow and an inner elbow, the outer elbow being sleeved on the outer side of the inner elbow to form an annular curved jacket flow channel; the inner elbow and the inner pipe are connected in series in sequence via their main flanges to form a medium flow channel for transporting reaction materials and reacting; sealing plates are provided at both ends of the straight jacket flow channel and the curved jacket flow channel, respectively, to seal the two ports of the straight jacket flow channel and the two ports of the curved jacket flow channel; the straight jacket flow channel and the curved jacket flow channel are connected in series through the jacket connecting pipe to form a cooling flow channel for transporting cooling medium". The lower center pipe of a multi-inlet jacket pipe connector is connected to the inner pipe of a straight casing, and the inlet outer pipe is connected to the outer pipe of the straight casing.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The standard parts used in the utility model can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt the conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A multi-inlet jacket pipe connector, comprising a lower central pipe (41) and an inlet outer pipe (42), wherein the lower central pipe (41) is located in the inlet outer pipe (42), a lower annular channel (43) with a sealed bottom is formed between the lower central pipe (41) and the inlet outer pipe (42), and a medium introduction pipe (44) communicating with the lower annular channel (43) is provided on the side wall of the inlet outer pipe (42), wherein: The medium introduction pipe (44) comprises a main introduction pipe (441) and an auxiliary introduction pipe (442); the axis of the main introduction pipe (441) is staggered with the axis of the inlet outer pipe (42); and the inner wall of the main introduction pipe (441) is partially tangent to the inner wall of the inlet outer pipe (42), so that the medium in the main introduction pipe (441) enters the lower annular channel (43) and flows in a spiral manner; the lower central pipe (41) is provided with a swirl sheet (6) for guiding the medium therein in a spiral manner.

2. A multi-inlet jacketed pipe connector according to claim 1, characterized in that: The axis of the auxiliary inlet pipe (442) is staggered with the axis of the inlet outer pipe (42), and the inner wall of the main inlet pipe (441) is partially tangent to the inner wall of the inlet outer pipe (42).

3. A multi-inlet jacketed pipe connector according to claim 2, characterized in that: The main introduction pipe (441) and the auxiliary introduction pipe (442) are arranged in the same rotation direction.

4. A multi-inlet jacketed pipe connector according to claim 1, characterized in that: The inner diameters of the introduction pipe (441) and the auxiliary introduction pipe (442) are equal, or the inner diameter of the main introduction pipe (441) is larger than the inner diameter of the auxiliary introduction pipe (442).

5. A multi-inlet jacketed pipe connector according to claim 1, characterized in that: The main inlet pipe (441) and the auxiliary inlet pipe (442) are both arranged vertically relative to the inlet outer pipe (42).

6. A multi-inlet jacketed pipe connector according to claim 1, characterized in that: The inlet pipe (441) and the swirl plate (6) are arranged in such a manner that the medium in the lower central pipe (41) and the medium in the lower annular channel (43) flow in the same direction or flow in the opposite direction.

7. A multi-inlet jacketed pipe connector according to claim 1, characterized in that: The radial cross section of the main introduction pipe (441) is circular, elliptical or oblong.

8. The multi-inlet jacketed pipe connector according to claim 1, characterized in that: The bottom of the lower annular channel (43) is a spirally ascending inclined surface, and the main inlet pipe (441) is connected to the lower position of the inclined surface; or the bottom of the lower annular channel (43) is a contour surface, and the inner walls of the main inlet pipe (441) and the auxiliary inlet pipe (442) are arranged flush with the contour surface.

9. A multi-inlet jacketed pipe connector according to claim 1, characterized in that: The lower central tube (41) and the inlet outer tube (42) are an integrated casting structure; and / or the swirl sheet (6) and the lower central tube (41) are an integrated casting structure.

10. A heat exchanger, characterized by: The invention comprises an inner sleeve (1), an outer sleeve (2) and a multi-inlet jacket pipe connector as claimed in any one of claims 1 to 9, wherein the inner sleeve (1) is concentrically inserted into the outer sleeve (2), and an annular jacket channel (3) is formed between the outer wall of the inner sleeve (1) and the inner wall of the outer sleeve (2); the upper end of the lower center pipe (41) is welded to fix the lower end of the inner sleeve (1), and the inlet outer pipe (42) is welded to fix the lower end of the outer sleeve (2); the inner sleeve (1) and the outer sleeve (2) are straight pipes or curved pipes.

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