Reforming cycle hydrogen compressor
By designing a reforming cycle hydrogen compressor and adopting a specific impeller arrangement and supporting thrust bearing structure, the problems of decreased catalyst activity and high hydrogen consumption were solved, stable catalyst regeneration and continuous operation of the device were achieved, and the efficiency and safety of the reforming process were improved.
Patent Information
- Application Number
- CN202410304266.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-18
- Publication Date
- 2025-09-19
AI Technical Summary
In the existing reforming process, the catalyst activity decreases, resulting in the need to shut down the unit for regeneration. The high hydrogen consumption and uneven partial pressure can easily lead to coking reactions, affecting the stability and efficiency of the continuous reforming process.
A reforming cycle hydrogen compressor was designed, including a stator group, a rotor group, a bearing group and a seal group. It adopted a specific impeller arrangement and diffuser form, support bearing and thrust bearing structure to improve temperature distribution and suppress coking reaction, ensuring the smooth operation of the compressor.
It increases the active life of the catalyst, reduces hydrogen consumption, stabilizes the temperature distribution in the reactor, inhibits coking reactions, and ensures the continuous and efficient operation of the reforming unit.
Smart Images
Figure CN120667394A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of compressor equipment, and in particular to a reforming cycle hydrogen compressor. Background Art
[0002] Hydrogen is a major industrial raw material and also the most important industrial gas and specialty gas. It is widely used in petrochemical industry, electronics industry, metallurgical industry, food processing, float glass, fine organic synthesis, aerospace and other fields.
[0003] Continuous reforming is a secondary petroleum processing technology. The raw materials processed are mainly low-octane straight-run naphtha, hydrogenated naphtha, etc. Catalysts are used at a high temperature of around 500°C to rearrange and isomerize the molecules, thereby increasing the production of aromatics and improving the octane number of gasoline. After a period of reforming reaction, the catalyst activity decreases due to carbon deposition on the surface of the reforming catalyst. At this time, the catalyst needs to be regenerated and the reforming unit needs to be shut down.
[0004] The by-product of catalytic reforming is hydrogen. A large amount of hydrogen will be produced in the early stage of the reaction. During the hydrocracking reaction, large molecular alkanes will break into lighter alkanes and low molecular gases, which will reduce the liquid yield and consume hydrogen. The reaction is exothermic, and a large amount of hydrogen is required during this reaction. Not only that, during the process of increasing temperature and pressure, it is easy to cause the generation of coking reaction due to uneven partial pressure. Summary of the Invention
[0005] The present invention seeks a reforming cycle hydrogen compressor in order to meet the special requirements of the continuous reforming process.
[0006] The reforming cycle hydrogen compressor of the present invention includes a stator group, a rotor group, a bearing group and a sealing group. The stator group includes a cylinder, a left end cover, a right end cover, a partition, an air inlet duct and an air outlet duct. Multiple partitions of the compressor are connected together by pull rod bolts to form a partition part. The partition part is installed into the cylinder by a special tool for the partition. The left end cover and the right end cover are bolted to the cylinder. The air inlet duct and the air outlet duct are welded under the cylinder. Some other parts are installed on the end cover in order to form a complete stator group.
[0007] Preferably, the multiple sets of partitions of the compressor are assembled together to form a partition bundle, and after the partition bundle is formed, the diffuser, bend and return device, which are the main locations through which the compressed gas of the compressor flows, are naturally formed.
[0008] Preferably, the bearing group includes two support bearings and one thrust bearing.
[0009] Preferably, the sealing group includes an interstage seal, a mouth ring seal, a balance disc seal, a shaft end seal and a dry gas seal.
[0010] Preferably, the diameter of the impellers installed on the rotor assembly is between 600 mm and 900 mm, the number of impellers is 6 to 8, and the impellers are arranged in a sequential manner on the main shaft with the balance disk on one side.
[0011] Preferably, the design concept is that the diameters of the front impeller and the rear impeller are the same at the outlet, but different at the inlet. The form of the impeller blades is different between the front and rear impellers, and the impeller blades in front of and behind the balance disk are also different. Between two adjacent impellers, the blades of the rear impeller are set to be deflected at a certain angle relative to the blades of the front impeller.
[0012] Preferably, the support bearing is a tilting pad bearing and the thrust bearing is a Kingsbury type. In order to ensure stress conditions, both sides of the thrust bearing adopt the same structure.
[0013] Preferably, the interstage seal and the mouth ring seal are installed on the corresponding partitions, and the shaft end seal and the dry gas seal are installed on the left and right end covers of the unit.
[0014] The reforming cycle hydrogen compressor of the present invention, the diffuser can be divided into a vaned diffuser and a vaneless diffuser. According to the unit design data provided by the user, after selection, in order to meet the user's requirements and to make the compressor perform better, the form of the diffuser can be adjusted to meet the requirements.
[0015] In the reforming cycle hydrogen compressor of the present invention, between two adjacent impellers, the blades of the rear impeller are arranged to be deflected at a certain angle relative to the blades of the front impeller; for backward curved blades, the angle is: 5 to 15 degrees; for forward curved blades, the angle is: 5 to 15 degrees; for radial blades, the angle is: 5 to 30 degrees.
[0016] In the reforming cycle hydrogen compressor of the present invention, the impellers are arranged on the main shaft in a sequential arrangement, and the balance disk is arranged on one side, which can effectively reduce the axial thrust generated by the gas on the rotor and make the entire unit run more smoothly.
[0017] The reforming cycle hydrogen compressor of the present invention comprises the support bearing and thrust bearing. The support bearing supports the rotor of the compressor, and the size of the support span plays a decisive role in the performance of the compressor. The thrust bearing is used to balance the axial thrust generated by the compressor rotor to ensure the smooth operation of the compressor.
[0018] The reforming cycle hydrogen compressor of the present invention can improve the temperature distribution in the reactor and act as a heat carrier; it can inhibit the coking reaction and protect the active life of the catalyst. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 is an overall cross-sectional view of the reforming cycle hydrogen compressor of the present invention; Figure 2 It is a cross-sectional view of the stator assembly of the reforming cycle hydrogen compressor of the present invention. DETAILED DESCRIPTION
[0020] The reforming cycle hydrogen compressor of the present invention will be further described and supplemented below with reference to the accompanying drawings.
[0021] like Figure 1 As shown, the reforming cycle hydrogen compressor of the present invention includes four major components: a stator group 1, a rotor group 2, a bearing group 3, and a seal group 4.
[0022] Figure 2 The figure shows a cross-sectional view of the stator group of the reforming cycle hydrogen compressor of the present invention. The stator group includes a cylinder 11, a left end cover 12, a right end cover 13, a partition 14, an air inlet duct 15, and an air outlet duct 16. The multiple partitions of the compressor are connected together by tie rod bolts to form a partition part 14, and the partition part is installed into the cylinder 11 by a special partition tool. The left end cover 12 and the right end cover 13 are fastened to the cylinder 11 by bolts. The air inlet duct 15 and the air outlet duct 16 are welded to the bottom of the cylinder 11. Some other parts are installed on the end covers in order to form a complete stator group 1.
[0023] Below we further illustrate and supplement the parameters of the reforming cycle hydrogen compressor of the present invention through specific examples.
[0024] Example 1 Steam turbine driven reforming cycle hydrogen compressor.
[0025] This embodiment 1 is a seven-stage centrifugal compressor. The impeller adopts a three-element plus two-element closed impeller, and its blades adopt a forward-curved structure; the blade diameter is 600 mm, the number of impellers is 8, the rear impeller is deflected 15 degrees relative to the front impeller, and the diffuser adopts a vaned diffuser. According to the user's on-site conditions, steam conditions are available, so this embodiment adopts a steam turbine drive.
[0026] Example 2 Steam turbine driven reforming cycle hydrogen compressor.
[0027] This embodiment 2 is an eight-stage centrifugal compressor. The impeller adopts a three-element plus two-element closed impeller, and its blades adopt a forward-curved structure; the blade diameter is 800 mm, the number of impellers is 6, and the rear impeller is deflected 5 degrees relative to the front impeller. The diffuser adopts a vaned diffuser. According to the user's on-site conditions, steam conditions are available, so this embodiment adopts a steam turbine drive.
[0028] Example 3: Motor-driven reforming cycle hydrogen compressor.
[0029] This embodiment 3 is a seven-stage centrifugal compressor. The impeller adopts a closed impeller, the impeller adopts a binary impeller, and the blades adopt a radial structure. The impeller diameter is 700mm, the number of impellers is 7, and the blades of the front and rear impellers are deflected by 15 degrees. A bladeless diffuser is used. The user site of this embodiment does not have steam conditions, so this reforming device adopts the form of a motor connected to a gearbox and a compressor.
[0030] Example 4: Motor-driven reforming cycle hydrogen compressor.
[0031] This embodiment 4 is a reforming cycle hydrogen compressor driven by a motor. The compressor is arranged on one side of the motor in the form of motor + gearbox + compressor. The impeller diameter of the compressor is 800 mm, and the number of impellers is 6. The impeller adopts a binary closed impeller, and its blades adopt a radial structure. The blades of the front and rear impellers are deflected 5 degrees; a bladeless diffuser is used.
[0032] Example 5 Steam turbine driven reforming cycle hydrogen compressor.
[0033] This embodiment 5 is a seven-stage centrifugal compressor. The impeller adopts a binary closed impeller, and its blades adopt a backward curved structure. The impeller diameter is 700 mm, the number of impellers is 6, and the deflection between the blades of the front and rear impellers is 10 degrees; the diffuser adopts a vaned diffuser. According to the user's on-site conditions, steam conditions are available, so this embodiment adopts a steam turbine drive.
[0034] Example 6 Steam turbine driven reforming cycle hydrogen compressor.
[0035] This embodiment 6 is an eight-stage centrifugal compressor. The impeller adopts a binary closed impeller, the blades of which adopt a backward curved structure, the blade diameter is 800 mm, the number of impellers is 8, and the deflection between the blades of the front and rear impellers is 15 degrees; the diffuser adopts a vaned diffuser. According to the user's on-site conditions, steam conditions are available, so this embodiment adopts a steam turbine drive.
[0036] Example 7 Motor-driven reforming cycle hydrogen compressor.
[0037] This embodiment 7 is a seven-stage centrifugal compressor. Its impeller is a closed, dual-element, radially arranged blade with a diameter of 600 mm and eight blades. The blades of the front and rear impellers are offset 30 degrees. A vaneless diffuser is also used. Because steam is not available at the user site, this embodiment employs a motor-gearbox-compressor configuration.
[0038] Example 8: Motor-driven reforming cycle hydrogen compressor.
[0039] The reforming cycle hydrogen compressor is driven by a motor. The compressor is arranged on one side of the motor in the form of motor + gearbox + compressor. The impeller diameter of the compressor is 600mm. The impeller adopts a binary closed impeller with a forward-curved structure. The blades of the two impellers before and after blade 7 are deflected 10 degrees. A bladeless diffuser is used.
[0040] Example 9: Motor-driven reforming cycle hydrogen compressor.
[0041] This embodiment 9 is a reforming cycle hydrogen compressor driven by a motor. The compressor is arranged on one side of the motor in the form of motor + gearbox + compressor. The impeller diameter of the compressor is 700 mm. The impeller adopts a binary closed impeller with 6 impellers. Its blades adopt a backward curved structure, and the blades of the front and rear impellers are deflected 5 degrees; a bladeless diffuser is used.
[0042] Example 10: Motor-driven reforming cycle hydrogen compressor.
[0043] This embodiment 10 is a reforming cycle hydrogen compressor driven by a motor. The compressor is arranged on one side of the motor in the form of motor + gearbox + compressor. The impeller diameter of the compressor is 600 mm. The impeller adopts a binary closed impeller. There are 8 impellers. The blades adopt a radial structure. The blades of the front and rear impellers are deflected by 20 degrees. A bladeless diffuser is used.
[0044] After signing a technical confidentiality agreement with the user, the designer of this invention provided reforming cycle hydrogen compressors of various sizes for the catalytic reforming production lines of many large petrochemical companies. After a period of stable operation, it achieved very ideal technical results and created better economic benefits, which received unanimous praise from users.
[0045] Each of the above schemes is an embodiment of a reforming cycle hydrogen compressor operating on-site for different users. Depending on the different requirements of the entire reforming cycle hydrogen process, the drive type and compressor selection structure used by the reforming cycle hydrogen compressor vary. The above embodiments are only a portion of reforming cycle hydrogen compressors operating on-site. The present invention is not limited to the above ten embodiments. For those skilled in the art, the form of the present invention may be modified and altered accordingly. Any changes and modifications within the spirit and principles of the present invention should be considered to be within the scope of the present invention.
Claims
1. A reforming cycle hydrogen compressor, comprising a stator assembly (1), a rotor assembly (2), a bearing assembly (3) and a seal assembly (4), characterized in that: The stator assembly (1) includes a cylinder (11), a left end cover (12), a right end cover (13), a partition (14), an air inlet duct (15) and an air outlet duct (16). Multiple partitions of the compressor are connected together by tie rod bolts to form a partition part, and the partition part is installed into the cylinder (11) through a special tool for the partition (14). The left end cover (12) and the right end cover (13) are bolted to the cylinder (11). The air inlet duct (15) and the air outlet duct (16) are welded below the cylinder (11). Other parts are installed on the end covers in order to form a complete stator assembly (1).
2. A reforming cycle hydrogen compressor according to claim 1, characterized in that: The multiple sets of partitions of the compressor are assembled together to form a partition bundle. After the partition bundle is formed, the main locations where the compressed gas of the compressor flows through, namely the diffuser, the bend and the return flow device, are naturally formed.
3. The reforming cycle hydrogen compressor according to claim 1, characterized in that: The bearing group (3) comprises two support bearings and a thrust bearing.
4. The reforming cycle hydrogen compressor according to claim 1, characterized in that: The sealing group (4) comprises an interstage seal, a mouth ring seal, a balance disc seal, a shaft end seal and a dry gas seal.
5. The reforming cycle hydrogen compressor according to claim 1, characterized in that: The diameter of the impeller installed on the rotor group (2) is between 600 mm and 900 mm, the number of impellers is 6 to 8, and the impellers are arranged in a sequential manner on the main shaft, with the balance disk on one side.
6. The reforming cycle hydrogen compressor according to claim 1, characterized in that: The rotor group (2) has a design concept that the diameters of the front impeller and the rear impeller at the outlet are the same, but the diameters at the inlet are different. The form of the impeller blades is different between the front and rear impellers, and the impeller blades before and after the balancing disk are also different. Between two adjacent impellers, the blades of the rear impeller are arranged to be deflected by a certain angle relative to the blades of the front impeller.
7. The reforming cycle hydrogen compressor according to claim 1, characterized in that: The support bearing adopts tilting pad bearing and the thrust bearing adopts Kingsbury type. In order to ensure the stress conditions, the two sides of the thrust bearing adopt the same structure.
8. The reforming cycle hydrogen compressor according to claim 1, characterized in that: The interstage seal and mouth ring seal are installed on the corresponding partitions, and the shaft end seal and dry gas seal are installed on the left and right end covers of the unit.