Radial reactor center tube support
By employing a double-ringed ladder structure of varying sizes and sealing measures in the radial reactor, the catalyst leakage problem caused by unstable central tube support was solved, enabling long-term stable operation of the unit.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SINOPEC GUANGZHOU ENG CO LTD
- Filing Date
- 2025-07-30
- Publication Date
- 2026-07-31
AI Technical Summary
In existing radial reactors, the central tube support is unstable, which can easily lead to catalyst leakage and affect the long-term stable operation of the unit.
The central tube support adopts a double-ring trapezoidal structure of large and small rings. The ring boss cooperates with the inner cylinder of the base, and together with the sealing gasket and welded sealing plate, a sealed channel is formed to prevent catalyst leakage. The central tube is installed in a 'riding seat' manner to ensure stable support.
It effectively prevents catalyst leakage, enhances the reliability of unit operation, avoids tilting of the central tube, and improves the long-term stability of the unit.
Smart Images
Figure CN224573715U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a central tube support, specifically, to a radial reactor central tube support. Background Technology
[0002] The radial moving bed reactor is the core equipment of moving bed process technology (such as continuous reforming, light hydrocarbon aromatization, etc.). The core component of the radial moving bed reactor (hereinafter referred to as the reactor) is its reaction zone, which consists of a central tube and a sector tube (or outer net). The catalyst passes from top to bottom through the annular space formed by the central tube and the sector tube (or outer net) inside the reactor. The medium passes radially from the sector tube (or outer net) through the catalyst bed and reacts before being separated from the catalyst through the central tube.
[0003] The central tube is supported on a support inside the reactor. Patent CN201940216U discloses a central tube support, which achieves support by inserting the central tube into the inner cylinder of the base and fixing it with positioning bolts. This support method has the following disadvantages: 1) Because the support is achieved by insertion, there is a gap between the central tube and the inner cylinder of the base. Catalysts can escape through this gap, causing unplanned shutdowns of the industrial plant. 2) Due to the insertion support, there is a protrusion on the upper part of the inner cylinder of the base. Catalysts tend to accumulate on this protrusion, increasing the probability of catalyst escape. 3) Because the rigidity of the central tube is much greater than that of the positioning bolts, the central tube is prone to tilting when the process operation is unstable. This can cause the positioning bolts to break under bending moment, resulting in unstable support of the central tube and further tilting. The tilting of the central tube will increase the gap between the central tube and the inner cylinder of the base, leading to catalyst escape and affecting the long-term stable operation of the industrial plant. Utility Model Content
[0004] To address the problems of easy catalyst leakage and insufficient stability of the central tube support in existing technologies, this invention provides a radial reactor central tube support.
[0005] The radial reactor center tube support provided by this utility model includes a support base plate, an outer base cylinder, an inner base cylinder, and a center tube base. The support base plate is annular, with a central hole for material passage at its center and circumferential holes for catalyst passage evenly distributed around its circumference. The outer base cylinder is welded to the support base plate outside the circumferential holes, and the inner base cylinder is welded to the support base plate inside the circumferential holes. The outer base cylinder, inner base cylinder, and central hole are coaxially arranged, forming a concentric annular catalyst channel between the outer base cylinder and the inner base cylinder. This concentric annular catalyst channel communicates with the circumferential holes on the support base plate. The inner base cylinder and the central hole together form a material channel. The upper outer side of the inner base cylinder has a stepped arrangement of a large annular platform and a small annular platform from the inside to the outside and from top to bottom. The lower outer side of the center tube base has an annular boss that mates with the large and small annular platforms. The center tube base is fitted onto the large and small annular platforms of the inner base cylinder in a "riding" manner through the annular boss.
[0006] As a further improvement, an annular sealing gasket can be installed between the small annular trapezoidal platform of the inner cylinder of the base and the annular boss of the central tube base to achieve a further sealing effect and prevent the catalyst from escaping.
[0007] As a further improvement, an annular sealing plate can be welded tightly against the outer wall of the inner cylinder of the base to the joint between the small annular trapezoidal platform of the base inner cylinder and the annular boss of the central tube base, so as to achieve a further sealing effect.
[0008] As a further improvement, high-temperature resistant material can be filled at all mounting contact surfaces formed between the inner cylinder of the base and the central tube base to seal the catalyst leakage channels and prevent the catalyst from escaping.
[0009] This utility model has the following beneficial effects:
[0010] 1) Due to the adoption of a double-ringed ladder structure, the gaps and protrusions between the central tube base and the inner cylinder of the base in the existing technology, as well as the accumulation of catalyst, are eliminated, which can effectively prevent the catalyst from escaping.
[0011] 2) The double-ringed ladder structure makes the catalyst exit channel more tortuous. The catalyst needs to pass through the channel formed by the small ring ladder of the central tube base and the inner cylinder of the base, and the large ring ladder of the inner cylinder of the base to exit. At the same time, the catalyst needs to overcome its own gravity and move upward against the current to pass through the long channel formed by the large ring ladder of the central tube base and the inner cylinder of the base to exit. This increases the difficulty of catalyst exit and improves the reliability of industrial plant operation.
[0012] 3) The annular protrusion of the central tube base extends in the same direction as the catalyst flow and its own weight, which can effectively prevent the catalyst from entering the catalyst leakage channel.
[0013] 4) The central tube base is fitted onto the large annular ladder platform inside the base cylinder in a "riding" manner, which can provide more effective centering support and effectively prevent the central tube from tilting, thereby preventing the agent from running away due to the tilt of the central tube.
[0014] 5) By eliminating the positioning bolts of the existing technology, the adverse effects of positioning bolt breakage and central tube tilting are avoided. At the same time, the "riding" installation method can effectively prevent the central tube from tilting. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a schematic diagram of the structure of the supporting base plate of this utility model;
[0017] Figure 3 This is a schematic diagram of the assembly structure of the central tube base and the inner cylinder of the base of this utility model.
[0018] In the figure: 1-support base plate, 2-base inner cylinder, 3-base outer cylinder, 4-connecting end cap, 5-central tube base, 6-reactor shell, 7-central hole, 8-circumferential hole, 9-large annular platform, 10-small annular platform, 11-annular boss. Detailed Implementation
[0019] The present invention will now be further described with reference to the accompanying drawings.
[0020] like Figures 1-3 As shown, the radial reactor center tube support provided by this utility model includes a support base plate 1, a base outer cylinder 3, a base inner cylinder 2, and a center tube base 5. The support base plate 1 is annular, with a central hole 7 for material passage at its center, and circumferential holes 8 evenly distributed around its circumference for catalyst passage. The base outer cylinder 3 is welded to the support base plate 1 outside the circumferential holes 8, and the base inner cylinder 2 is welded to the support base plate 1 inside the circumferential holes 8. The base outer cylinder 3, the base inner cylinder 2, and the central hole 7 are coaxially arranged, forming a concentric annular catalyst layer between the base outer cylinder 3 and the base inner cylinder 2. The catalyst channel is a concentric annular channel that communicates with the circumferential hole 8 on the support base plate 1. The inner cylinder 2 of the base and the central hole 7 together form a material channel. The outer side of the upper end of the inner cylinder 2 is provided with a large annular platform 9 and a small annular platform 10 arranged in a stepped manner from the inside to the outside and from the top to the bottom. The outer side of the lower end of the central tube base 5 is provided with an annular boss 11 that cooperates with the large annular platform 9 and the small annular platform 10. The central tube base 5 is mounted on the large annular platform 9 and the small annular platform 10 of the inner cylinder 2 in a "riding" manner through the annular boss 11.
[0021] The upper end of the outer cylinder 3 of the base is connected to the connecting head 4 by bolts, and the upper end of the connecting head 4 is connected to the reactor shell 6.
[0022] To achieve better sealing, an annular sealing gasket (not shown in the figure) can be provided between the small annular trapezoid 10 of the inner cylinder 2 and the annular boss 11 of the central tube base 5. Simultaneously, an annular sealing plate (not shown in the figure) can be welded tightly against the outer wall of the inner cylinder 2 at the junction of the small annular trapezoid 10 of the inner cylinder 2 and the annular boss 11 of the central tube base 5. Alternatively, all mounting contact surfaces formed between the inner cylinder 2 and the central tube base 5 can be filled with a high-temperature resistant material (not shown in the figure) to seal catalyst leakage channels and prevent catalyst escape.
[0023] In operation, the material flows within the material channel formed by the central tube and the central tube base 5. The catalyst flows downwards along the concentric annular catalyst channel formed between the outer cylinder 3 and the inner cylinder 2 of the base, and is discharged from the reactor through the circumferential holes 8. Due to the double annular trapezoidal structure formed by the large annular trapezoidal platform 9 and the small annular trapezoidal platform 10, the catalyst exit channel becomes more tortuous. Furthermore, the catalyst needs to overcome its own gravity and move upwards through the longer channel formed by the large annular trapezoidal platform 9 of the central tube base 5 and the inner cylinder 2 of the base to exit, increasing the difficulty of catalyst exit and improving the reliability of the industrial plant operation.
Claims
1. A radial reactor center pipe support characterized by: The system includes a supporting base plate, an outer base cylinder, an inner base cylinder, and a central tube base. The supporting base plate is annular, with a central hole for material passage and circumferential holes for catalyst passage evenly distributed around its circumference. The outer base cylinder is welded to the supporting base plate outside the circumferential holes, and the inner base cylinder is welded to the supporting base plate inside the circumferential holes. The outer base cylinder, inner base cylinder, and central hole are coaxially arranged, forming a concentric annular catalyst channel between the outer base cylinder and the inner base cylinder. This concentric annular catalyst channel communicates with the circumferential holes on the supporting base plate. The inner base cylinder and the central hole together form a material channel. The upper outer side of the inner base cylinder has a stepped arrangement of a large annular platform and a small annular platform, arranged from the inside out and from top to bottom. The lower outer side of the central tube base has an annular boss that mates with the large and small annular platforms. The central tube base is fitted onto the large and small annular platforms of the inner base cylinder in a "riding" manner through the annular boss.
2. The radial reactor center pipe support of claim 1, wherein: An annular sealing gasket is provided between the small annular trapezoid of the inner cylinder of the base and the annular boss of the central tube base.
3. The radial reactor center pipe support of claim 1, wherein: All mounting contact surfaces formed between the inner cylinder of the base and the central tube base are filled with high-temperature resistant material.
4. The radial reactor center pipe support of claim 1, wherein: An annular sealing plate is welded tightly against the outer wall of the inner cylinder of the base at the junction of the small annular trapezoidal platform of the inner cylinder and the annular boss of the central tube base.
5. The radial reactor center tube support of claim 2, wherein: An annular sealing plate is welded tightly against the outer wall of the inner cylinder of the base at the junction of the small annular trapezoidal platform of the inner cylinder and the annular boss of the central tube base.
6. The radial reactor center tube support of claim 3, wherein: An annular sealing plate is welded tightly against the outer wall of the inner cylinder of the base at the junction of the small annular trapezoidal platform of the inner cylinder and the annular boss of the central tube base.