CN117695946A - Catalyst support beam structure, installation method and reactor - Google Patents

Catalyst support beam structure, installation method and reactor Download PDF

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Publication number
CN117695946A
CN117695946A CN202311666585.6A CN202311666585A CN117695946A CN 117695946 A CN117695946 A CN 117695946A CN 202311666585 A CN202311666585 A CN 202311666585A CN 117695946 A CN117695946 A CN 117695946A
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CN
China
Prior art keywords
reactor
support beam
catalyst support
beam structure
hole
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Pending
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CN202311666585.6A
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Chinese (zh)
Inventor
章霖
高殿宝
焦东
王雷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dalian Nuclear Power And Petrochemical Co ltd
China First Heavy Industries Co Ltd
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Dalian Nuclear Power And Petrochemical Co ltd
China First Heavy Industries Co Ltd
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Application filed by Dalian Nuclear Power And Petrochemical Co ltd, China First Heavy Industries Co Ltd filed Critical Dalian Nuclear Power And Petrochemical Co ltd
Priority to CN202311666585.6A priority Critical patent/CN117695946A/en
Publication of CN117695946A publication Critical patent/CN117695946A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/008Details of the reactor or of the particulate material; Processes to increase or to retard the rate of reaction

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)

Abstract

The invention provides a catalyst support beam structure, a mounting method and a reactor, and relates to the technical field of internal support structures of hydrogenation reactors, in particular to a catalyst support beam structure which is arranged on the inner wall of the reactor and comprises the following components: the support beams and the connecting plates are arranged at two ends of the support beams and are used for connecting the ends of the support beams and the inner wall of the reactor; the connecting plate is provided with a connecting hole, the connecting piece penetrates through the connecting hole to fixedly connect the end part of the supporting beam with the inner wall of the reactor, the connecting hole comprises a positioning hole and an adjusting hole, the adjusting hole is suitable for being connected in advance under a stress state, and the positioning hole is suitable for fixing the final position after the stress state. The invention improves the operation safety, reduces the installation cost, can fix multiple beds simultaneously when the final position is fixed, simplifies the difficulty, improves the installation efficiency and saves the manpower and material resources.

Description

Catalyst support beam structure, installation method and reactor
Technical Field
The invention relates to the technical field of internal support structures of hydrogenation reactors, in particular to a catalyst support beam structure, an installation method and a reactor.
Background
The hydrogenation reactor is used as an important device in organic chemistry laboratories and actual production processes, can be used as a container for hydrogenation reaction, can be used for occasions where liquid and gas need to be fully mixed, and particularly can be used for converting heavy parts which are most difficult to use into light oil through hydrogenation in the petroleum industry, so that gasoline, diesel oil and the like are produced. Wherein, the catalyst girder in the hydrogenation reactor is used as one of the most important catalyst bed components in the hydrogenation reactor, which provides important supporting function for the hydrogenation catalytic reaction of the hydrogenation reactor.
However, the traditional catalyst girder installation method is that after the reactor is vertically installed in place on site, the catalyst girder is hung into the reactor from a manhole by a crane for installation, the catalyst girder is installed and fixed on a boss layer by layer from the bottommost layer to the highest layer, the installation method is single, only a single bed layer can be used for operation, and the problems of any quality problem, out-of-tolerance installation size and the like of the catalyst girder during installation are caused, the girder is hung out, the girder is reinstalled and fixed after repair treatment, and the time cost, the manpower and material cost are high. Particularly, the cost of a crane on site is high, the closed space in the reactor is limited, and the weight of a girder single piece reaches 3-8 tons, so that the potential safety hazard of the operation of the closed space is high.
Disclosure of Invention
The invention solves the problems of time and labor waste, high cost and large potential safety hazard of the traditional installation mode.
In order to solve the above problems, the present invention provides a catalyst support beam structure disposed on an inner wall of a reactor, comprising:
the support beams and the connecting plates are arranged at two ends of the support beams and are used for connecting the ends of the support beams and the inner wall of the reactor; the connecting plate is provided with a connecting hole, the connecting piece penetrates through the connecting hole to fixedly connect the end part of the supporting beam with the inner wall of the reactor, the connecting hole comprises a positioning hole and an adjusting hole, the adjusting hole is suitable for being connected in advance under a stress state, and the positioning hole is suitable for fixing the final position after the stress state.
Further, the adjusting hole is a strip hole, and the length direction of the strip hole is consistent with the axial direction of the supporting beam.
Further, the opening size L of the strip hole Inner diameter of The method is obtained according to a thermal expansion calculation formula 1 of the reactor in the heat treatment process, wherein the formula 1 is as follows:
L=K*(T PWHT -C)*L inner diameter of *10 -6
Wherein L is the thermal expansion value at the corresponding processing temperature, K is the thermal expansion coefficient of the material, T PWHT The temperature of PWHT (DEG C) and the temperature of C (DEG C) are the temperature of PWHT.
Further, the reactor comprises a fixing plate which is fixedly connected with the inner wall of the reactor, two fixing holes are formed in the fixing plate, and the two fixing holes are respectively and correspondingly arranged with the positioning holes and the adjusting holes and are connected through bolts.
Further, the connecting plate is fixedly connected with the end face of the end part of the support beam, and the connecting surface of the connecting plate and the end face of the end part of the support beam is an inclined surface.
Further, the connecting plate is fixedly connected with the bottom surface of the end part of the supporting beam, and the connecting plate is connected with the fixing plate through bolts.
Compared with the traditional catalyst girder installation structure, the structure not only greatly improves the one-time installation qualification rate of the catalyst girder, but also can realize multi-bed simultaneous operation, improves the installation efficiency by at least 1 time, and can also rapidly treat the occurrence of installation deviation by the cooperation of the adjusting holes and the positioning holes. The structure is applicable to horizontal installation in a factory, so that the operation safety is improved, the installation cost is reduced, multiple beds can be fixed simultaneously when the final position is fixed, the difficulty is simplified, the efficiency is improved, and the manpower and material resources are saved.
The present invention also provides an installation method of the catalyst support beam structure according to the above, comprising the steps of:
step S1: connecting the connecting plates with two ends of the supporting beam, and hanging the supporting beam into the reactor in a horizontal state of the reactor;
step S2: the connecting plate is connected with the inner wall of the reactor through the adjusting holes, the connection of the adjusting holes is loosened after heat treatment, and the position of the supporting beam is positioned through the positioning holes, so that the installation is completed.
Further, a fixing plate is arranged on the inner wall of the reactor, and the fixing plate and the connecting plate pass through the adjusting hole or the positioning hole through bolts to be connected.
Further, in step S1, a plurality of the support beams may be suspended into the reactor while being installed in a horizontal state.
Compared with the prior art, the method for installing the catalyst supporting beam structure has the advantages that the supporting beam is hung into the reactor for installation in the horizontal state of the reactor, so that the catalyst supporting beam can be horizontally installed and fixed in a manufacturing factory, the problems of high installation cost and high operation safety hidden danger of the catalyst girder in the vertical state of the hydrogenation reactor in the prior art are solved, and the problem that the supporting beam is difficult to fix when being transported in the horizontal state of the reactor is avoided. Moreover, because the catalyst girder is installed in a factory, the installation procedure of the catalyst girder can be reasonably combined with other procedures, so that the manufacturing progress and efficiency of the product are further improved.
The invention also provides a reactor which comprises the catalyst support beam structure, and the reactor is a forge welding structure reactor or a plate welding structure reactor.
The advantages of the reactor according to the invention over the prior art are the same as those of the catalyst support beam structure over the prior art and are not described in detail here.
Drawings
FIG. 1 is a schematic view of a catalyst support beam structure according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a catalyst support beam structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a catalyst support beam structure in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a catalyst support beam structure according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a catalyst support beam structure according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a connection board according to an embodiment of the invention.
Reference numerals illustrate:
1-supporting beams; 2-connecting plates and 21-positioning holes; 22-adjusting holes; 3-fixing plates; 31-fixing holes; 4-bolts.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
As shown in fig. 1 to 6, a catalyst support beam structure provided on an inner wall of a reactor, comprising:
the reactor comprises a plurality of support beams 1 and connecting plates 2, wherein the connecting plates 2 are arranged at two ends of the support beams 1 and are used for connecting the end parts of the support beams 1 with the inner wall of the reactor; the connecting plate 2 is provided with a connecting hole, a connecting piece penetrates through the connecting hole to fixedly connect the end part of the supporting beam 1 and the inner wall of the reactor, the connecting hole comprises a positioning hole 21 and an adjusting hole 22, the adjusting hole 22 is suitable for pre-connecting in a stressed state, and the positioning hole 21 is suitable for fixing the final position after the stressed state.
Compared with the traditional catalyst girder installation structure, the structure not only greatly improves the one-time installation qualification rate of the catalyst supporting beams through the matching use of the adjusting holes 22 and the positioning holes 21, but also can realize the simultaneous or continuous installation of a plurality of groups of catalyst supporting beams, even the simultaneous operation of a plurality of beds due to the pre-positioning function of the adjusting holes 22, and improves the installation efficiency by at least 1 time, and can also rapidly treat the occurrence of installation deviation. The catalyst support beam structure is simple to install, small in required space and suitable for connection in a stressed state, so that the catalyst support beam structure is not limited to vertical installation, can be transported after being horizontally installed in a factory, improves the operation safety, reduces the installation cost, can be fixed simultaneously by multiple beds when the final position is fixed, simplifies the difficulty, improves the efficiency and saves the manpower and material resources.
Specifically, the support beam 1 in the embodiment is arranged in the reactor and is connected with the inner wall of the reactor through the connecting plate 2, at least one layer of support beam 1 structure and a support tray are arranged in the reactor, the support tray is arranged on the support beam 1 structure, and the support tray is a catalyst bed layer; the supporting beam 1 structure comprises a plurality of supporting beams 1 which are arranged in parallel, the supporting beams 1 are required to be hung into the reactor from a manhole one by adopting a traditional installation method, the supporting beams are installed and fixed on a boss on the inner wall layer by layer from the bottommost layer to the highest layer, the efficiency is low, any quality problem, the installation size is out of tolerance and the like of the catalyst girder during the installation period are caused, the girder is required to be hung out, the girder is re-installed and fixed after the repairing treatment, and the time cost, the manpower and material resource cost are high.
In some embodiments of the invention, a plurality of layers of support rings are arranged on the inner wall of the reactor for placing the support beams 1. The support rings are usually attached to the reactor wall by welding and their thickness is calculated from the actual load. The support beam 1 mainly consists of a base, a main support, and a top support surface. The base is located the below of main support, and the top supporting surface is located the top of main support, and the cross-sectional area of base and top supporting surface is all greater than the cross-sectional area of main support. The length of the base is smaller than the inner diameter of the supporting ring; the length of the main support is greater than the inner diameter of the support ring and less than the outer diameter of the support ring. The supporting beam 1 is connected and fixed with the supporting ring through a connecting plate 2. The connecting hole of the connecting plate 2 is fixedly connected with the end part of the supporting beam 1 and the inner wall of the reactor, the connecting hole comprises a positioning hole 21 and an adjusting hole 22, the adjusting hole 22 is suitable for being connected in advance in a stressed state, and the positioning hole 21 is suitable for fixing the final position after the stressed state. The stress state of the embodiment of the invention refers to the thermal history of the reactor in the manufacturing process and the stress state of the reactor in the rotating process. In the heat treatment, the end of the support beam 1 and the reactor are considered to be deformed and expanded to some extent, and the sizes of the support beam and the reactor are deviated, so that the support beam is connected in a pre-connection mode, the reactor can be expanded freely in the final heat treatment process, and the support beam 1 can be adjusted to a more adaptive position. And then the connection on the adjusting holes 22 is loosened, the final position of the catalyst supporting beam 1 is determined, and then the positioning holes 21 are connected and positioned, so that high-efficiency connection is realized.
In some embodiments, the adjustment holes 22 are elongated holes, and the length direction of the elongated holes is consistent with the axial direction of the support beam 1. Thereby, the adjustment capability of the adjustment hole 22 is realized, the damage of adjacent pieces in the mounting process is reduced, and the mounting efficiency is improved.
In some embodiments, the elongate aperture has an aperture dimension L Inner diameter of The method is obtained according to a thermal expansion calculation formula 1 of the reactor in the heat treatment process, wherein the formula 1 is as follows:
L=K*(T PWHT -C)*L inner diameter of *10 -6
Wherein L is the thermal expansion value at the corresponding processing temperature, K is the thermal expansion coefficient of the material, T PWHT The temperature of PWHT (DEG C) and the temperature of C (DEG C) are the temperature of PWHT.
In this embodiment, before the final weld joint of the reactor is closed, the catalyst support beam is installed into the reactor and is temporarily fixed, and the catalyst support beam is involved in the final heat treatment and hydrostatic test together with the reactor, so the design is designed in consideration of the thermal history in the manufacturing process of the reactor and the stress state in the rotation process, the size of the elongated holes for adjustment is designed, and particularly in consideration of the influence of thermal expansion on the material, the opening size L of the elongated holes is calculated according to the thermal expansion calculation formula of the reactor in the heat treatment process Inner diameter of Finally, the irreversible consequences of the catalyst supporting beam caused by the problems of out-of-tolerance size or welding, heat treatment deformation and the like are avoided, and the fault tolerance of the product production is greatly improved. Therefore, the multi-bed catalyst support beam can be simultaneously and rapidly adjusted and fixed at the final size, and rapid installation and fixation are realized. The opening size L of the elongated hole Inner diameter of The length of the long hole of the connecting plate 2 is referred to as the thermal expansion value of the catalyst support beam. Specifically, according to the formula, if the thermal expansion value of the catalyst supporting beam is 30mm, the length of the open hole of the unilateral strip hole is more than or equal to 15mm, and under the condition, the catalyst supporting beam can be freely expanded in the heat treatment process, so that the risk of extrusion damage is avoided.
In some specific embodiments, as shown in fig. 1 to 6, the catalyst support beam structure further includes a fixing plate 3, the fixing plate 3 is fixedly connected to the inner wall of the reactor, and two fixing holes 31 are provided on the fixing plate 3, and the two fixing holes 31 are respectively provided corresponding to the positioning holes 21 and the adjusting holes 22 and are connected through bolts 4.
The fixed plate 3 in this embodiment is welded on the inner wall of the reactor or on the supporting ring of the inner wall of the reactor, and the fixed hole 31 on the fixed plate 3 is used for being connected with the positioning hole 21 or the adjusting hole 22 through the bolt 4, so that the bolt 4 connection between the connecting plate 2 and the fixed plate 3 is realized, the connection is convenient, and the efficiency is high.
In some specific embodiments, the connection plate 2 is fixedly connected to the end face of the end of the support beam 1, and the connection surface of the connection plate 2 to the end face of the end of the support beam 1 is an inclined surface.
In this embodiment, as shown in fig. 1 and 6, for the heavy situation of the supporting beam 1, considering the limitation of the welding space between the connecting plate 2 and the end face of the end portion of the supporting beam 1, the connecting surface between the connecting plate 2 and the end face of the end portion of the supporting beam 1 is set to be an inclined surface, so that the full penetration structure is ensured, and meanwhile, the least welding steps are realized, the construction difficulty is simplified, and the welding operation of the transportation supporting piece in the limited space is performed rapidly and efficiently.
In some specific embodiments, the connection plate 2 is fixedly connected to the bottom surface of the end of the support beam 1, and the connection plate 2 is connected to the fixing plate 3 by bolts 4.
In this embodiment, the connecting plate 2 can be fixed on the bottom surface of the end of the supporting beam 1 in order to avoid the limitation of the control space and improve the installation efficiency for the case that the supporting beam 1 is relatively light.
The embodiment of the invention also provides an installation method of the catalyst support beam structure, which comprises the following steps:
step S1: connecting the connecting plates 2 with two ends of the supporting beam 1, and hanging the supporting beam 1 into the reactor in a horizontal state of the reactor;
step S2: the connecting plate 2 is connected with the inner wall of the reactor through the adjusting holes 22, after heat treatment, the connection of the adjusting holes 22 is loosened, and the position of the supporting beam 1 is positioned through the positioning holes 21, so that the installation is completed.
According to the method for installing the catalyst supporting beam structure, the supporting beam 1 is hung into the reactor for installation in the horizontal state of the reactor, so that the catalyst supporting beam can be horizontally installed and fixed in a manufacturing factory, the problems that the catalyst girder is high in installation cost and high in operation safety hidden danger in the vertical state of the hydrogenation reactor at the present stage are solved, and the problem that the supporting beam 1 is difficult to fix when transported in the horizontal state of the reactor is avoided. Moreover, because the catalyst girder is installed in a factory, the installation procedure of the catalyst girder can be reasonably combined with other procedures, so that the manufacturing progress and efficiency of the product are further improved.
In step S1, the connection manner of the connection plate 2 and the two ends of the support beam 1 may be a fixed connection, preferably, may be welding, and has good structural stability. Meanwhile, the catalyst can be installed in a horizontal state, so that the problems of high installation cost and high operation safety hidden danger of a catalyst girder in a vertical state of the hydrogenation reactor in the prior art are solved, and the cost is low and the efficiency is high.
In the step S2, before heat treatment, the bolts 4 are connected with the inner wall of the reactor through the adjusting holes 22, so that the position is quickly adjusted in a stressed state, the irreversible effect caused by size change or displacement is avoided, and the fault tolerance is improved; after the stress state such as heat treatment is finished, the position determination is quickly realized according to the relative position, and the position of the supporting beam 1 is positioned through the positioning holes 21, so that the installation is finished. The operation is simple and the efficiency is high. Illustratively, after the heat treatment of the product, the reactor is rotated to an orientation where the support beam 1 is parallel to the ground, and then the gaps between the various parts of the support beam 1 are adjusted to the final dimensions required in the drawing while fixing all support beams 1 below the center line of the reactor. After the support beams 1 are fixed, all support beams 1 below the center line are inspected at the same time, then the shell is rotated 180 degrees, and all support beams 1 below the center line of the reactor are inspected at the same time. Thus, all support beams 1 below the center line are fixed at the same time, after which the reactor is rotated 180 °, and then all support beams 1 below the center line of the reactor are fixed. Greatly improves the installation efficiency and realizes the rapid and stable installation.
In some specific embodiments, a fixing plate 3 is provided on the inner wall of the reactor, and the fixing plate 3 is connected with the connecting plate 2 through an adjusting hole 22 or a positioning hole 21 by a bolt 4.
Preferably, the fixing plate 3 is provided to facilitate improvement of installation efficiency and convenient installation.
In some specific embodiments, in step S1, a plurality of support beams 1 may be suspended into the reactor while being installed in a horizontal state of the reactor.
Therefore, the structure and the installation mode are simplified, a plurality of support beams 1 can be suspended into the reactor to realize the preliminary positioning, and then the simultaneous fixation of multiple beds is carried out, so that the installation efficiency is greatly improved, and the cost is saved.
The embodiment of the invention also provides a reactor which comprises the catalyst support beam structure, and the reactor is a forge welding structure reactor or a plate welding structure reactor.
The advantages of the reactor according to the embodiments of the present invention with respect to the prior art are the same as those of the catalyst support beam structure with respect to the prior art, and will not be described in detail herein.
Although the present disclosure is disclosed above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the disclosure.

Claims (10)

1. A catalyst support beam structure disposed on an inner wall of a reactor, comprising:
the reactor comprises a plurality of supporting beams (1) and connecting plates (2), wherein the connecting plates (2) are arranged at two ends of the supporting beams (1) and are used for connecting the end parts of the supporting beams (1) with the inner wall of the reactor; the connecting plate (2) is provided with a connecting hole, the end part of the supporting beam (1) and the inner wall of the reactor are fixedly connected through a connecting piece penetrating through the connecting hole, the connecting hole comprises a positioning hole (21) and an adjusting hole (22), the adjusting hole (22) is suitable for being connected in advance under a stress state, and the positioning hole (21) is suitable for fixing the final position after the stress state.
2. The catalyst support beam structure according to claim 1, characterized in that the adjustment holes (22) are elongated holes, the length direction of which coincides with the axial direction of the support beam (1).
3. The catalyst support beam structure of claim 2, wherein the elongated holes have an opening dimension L Inner diameter of The method is obtained according to a thermal expansion calculation formula 1 of the reactor in the heat treatment process, wherein the formula 1 is as follows:
L=K*(T PWHT -C)*L inner diameter of *10 -6
Wherein L is the thermal expansion value at the corresponding processing temperature, K is the thermal expansion coefficient of the material, T PWHT The temperature of PWHT (DEG C) and the temperature of C (DEG C) are the temperature of PWHT.
4. The catalyst support beam structure according to claim 1, further comprising a fixing plate (3), wherein the fixing plate (3) is fixedly connected to the inner wall of the reactor, and two fixing holes (31) are provided on the fixing plate (3), and the two fixing holes (31) are respectively provided corresponding to the positioning holes (21) and the adjusting holes (22) and are connected by bolts (4).
5. The catalyst support beam structure according to claim 1, characterized in that the connection plate (2) is fixedly connected to an end face of an end portion of the support beam (1), and a connection face of the connection plate (2) to the end face of the end portion of the support beam (1) is an inclined face.
6. The catalyst support beam structure according to claim 4, characterized in that the connection plate (2) is fixedly connected to the bottom surface of the end portion of the support beam (1), and the connection plate (2) is connected to the fixing plate (3) by bolts (4).
7. A method of installing a catalyst support beam structure according to any one of claims 1 to 6, comprising the steps of:
step S1: connecting the connecting plates (2) with two ends of the supporting beam (1), and hanging the supporting beam (1) into the reactor in a horizontal state of the reactor;
step S2: the connecting plate (2) is connected with the inner wall of the reactor through the adjusting hole (22), after heat treatment, the connection of the adjusting hole (22) is loosened, and the position of the supporting beam (1) is positioned through the positioning hole (21), so that the installation is completed.
8. The method for installing a catalyst support beam structure according to claim 7, wherein a fixing plate (3) is provided on the inner wall of the reactor, and the fixing plate (3) and the connecting plate (2) are connected by bolts (4) through the adjustment holes (22) or the positioning holes (21).
9. The method for installing a catalyst support beam structure according to claim 7, wherein in step S1, a plurality of the support beams (1) are suspended into the reactor while being installed in a horizontal state.
10. A reactor comprising a catalyst support beam structure as claimed in any one of claims 1 to 6, the reactor being a forge welded reactor or a plate welded reactor.
CN202311666585.6A 2023-12-06 2023-12-06 Catalyst support beam structure, installation method and reactor Pending CN117695946A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311666585.6A CN117695946A (en) 2023-12-06 2023-12-06 Catalyst support beam structure, installation method and reactor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311666585.6A CN117695946A (en) 2023-12-06 2023-12-06 Catalyst support beam structure, installation method and reactor

Publications (1)

Publication Number Publication Date
CN117695946A true CN117695946A (en) 2024-03-15

Family

ID=90154514

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311666585.6A Pending CN117695946A (en) 2023-12-06 2023-12-06 Catalyst support beam structure, installation method and reactor

Country Status (1)

Country Link
CN (1) CN117695946A (en)

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