Multi-stage centrifugal process compressor structure

Abstract

The invention discloses a multistage centrifugal process compressor structure, and relates to the technical field of centrifugal compressors, the multistage centrifugal process compressor structure comprises a main body skid and a cooler skid, the main body skid comprises a main body base, the main body base is connected with a supporting frame, the top of the supporting frame is connected with a compressor body and a main motor, and the main motor drives the compressor body to work; the compressor body is provided with a plurality of compression stage units which sequentially comprise a first compression stage, a second compression stage, a third compression stage and a fourth compression stage, the output ends of the compression stage units are connected with the corresponding cooling units, and the compression stage units sequentially comprise a first-stage cooler, a second-stage cooler, a third-stage cooler and a fourth-stage cooler; a first-stage cooler, a second-stage cooler and a lubricating oil station which are located in the supporting frame are connected to the main body base, the lubricating oil station supplies oil to the compressor body and the main motor, and the third-stage cooler and the fourth-stage cooler are connected to the cooler skid. The effects that the occupied area is small, the civil engineering cost is saved, and on-site installation is convenient are achieved.

Description

Technical Field

[0001] This invention relates to the field of centrifugal compressor technology, and in particular to a multi-stage centrifugal process compressor structure. Background Technology

[0002] Process compressors are the core equipment in air separation units for conveying and compressing process gases. Their performance and structural layout directly affect the efficiency and investment cost of the production line. Traditional multistage centrifugal compressor units adopt a split structure, meaning that the compressor body, gearbox, drive unit (such as motor or steam turbine), lubrication station and gas cooler are all independent units, requiring foundation fabrication, positioning, alignment and installation on the user's site.

[0003] Currently, although some manufacturers have tried basic skid-mounted designs, they are mostly limited to simply fixing a few components to the base. The integration is low, and the compressor's air circuit, oil circuit and control system have not been highly optimized and compacted as a whole. As a result, the size reduction is limited, and there are still shortcomings in terms of transportation, hoisting and maintenance convenience. For example, the large footprint of the equipment and the dispersed layout of each unit significantly increase plant construction and space costs. Simultaneously, on-site installation is complex, time-consuming, and requires highly skilled installers, making it difficult to consistently control installation quality. Therefore, the industry urgently needs a highly integrated, compact process compressor solution that can significantly reduce floor space and improve deployment efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stage centrifugal compressor structure that integrates the compressor body, motor, gas cooler, and oil station into a single skid, which can be fixedly installed on the first floor of a factory building. It has the advantages of small footprint, saving civil engineering costs, and convenient on-site installation.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A multi-stage centrifugal compressor structure includes a main body skid and a cooler skid. The main body skid includes a main body base, a support frame connected to the main body base, and a compressor body and a main motor connected to the top of the support frame. The main motor drives the compressor body to work. The compressor body is provided with several compression stage units, including a first compression stage, a second compression stage, a third compression stage, and a fourth compression stage in sequence. The output end of the compression stage unit is connected to a corresponding cooling unit, including a first-stage cooler, a second-stage cooler, a third-stage cooler, and a fourth-stage cooler in sequence. The main base is connected to the primary cooler, secondary cooler and lubrication station located in the support frame. The lubrication station supplies oil to the compressor body and main motor. The tertiary cooler and quaternary cooler are connected to the cooler skid.

[0006] Furthermore, the primary and secondary coolers are horizontally arranged side by side on the main body base, while the tertiary and quaternary coolers are vertically distributed on the cooler skids.

[0007] Furthermore, the main body base is provided with base positioning pin holes, and the support frame is provided with frame positioning pin holes, and the base positioning pin holes and the frame positioning pin holes are connected by positioning pins.

[0008] Furthermore, the main body skid and the cooler skid are provided with gas pipes, which include an inlet pipe connected to the inlet end of a compression stage, an interstage pipe connected between compression stage units, and an outlet pipe connected to the outlet end of a fourth compression stage.

[0009] Furthermore, the gas pipeline is equipped with several fully enclosed temperature measuring instrument connectors.

[0010] Furthermore, the compressor body includes an input shaft, a first-stage stator, a second-stage stator, a third-stage stator, and a fourth-stage stator. The input shaft drives the first-stage and second-stage rotors and the third-stage and fourth-stage rotors. The first-stage and second-stage rotors are respectively connected to the first-stage impeller and the second-stage impeller at both ends, and the third-stage and fourth-stage rotors are respectively connected to the third-stage impeller and the fourth-stage impeller at both ends. The compression stage unit includes corresponding stators and impellers.

[0011] Furthermore, the lubrication station includes a lubrication oil tank and an oil cooler. The lubrication oil in the lubrication oil tank is supplied to the compressor body and the main motor after passing through the oil cooler.

[0012] Furthermore, the main body base is connected to the cabinet bottom positioning block, and the support frame is provided with the cabinet top positioning block, which connects the control cabinet.

[0013] Furthermore, the stator volute in the compressor body adopts an external volute design.

[0014] Furthermore, the bottom plate of the lubricating oil tank is double-sloped.

[0015] In summary, the present invention has the following beneficial effects: The compressor body, motor, primary gas cooler, secondary gas cooler, and oil station are integrated into the main skid, while the remaining tertiary and quaternary gas coolers are integrated into the cooler skid. Both skids are fixedly installed on the first floor of the factory building, which has the advantages of small footprint, saving civil engineering costs, and convenient on-site installation. The cooler base, tertiary cooler, and quaternary cooler in the cooler skid are arranged vertically from bottom to top, further reducing the equipment's footprint. The main base is bolted to the support frame. The main base is provided with a base positioning pin hole, and the support frame is provided with a frame positioning pin hole. The two are connected by a positioning tapered pin to facilitate easy disassembly and assembly during later maintenance. All stators in the compressor body adopt an external volute design, which reduces one flow loss compared to an internal volute and effectively improves aerodynamic efficiency. The bottom plate of the lubricating oil tank adopts a double-inclined design, so that the slag discharge is collected at one point for easy cleaning. The control cabinet adopts a modular installation type and is integrated on the main body skid. The main body base is equipped with a bottom positioning block for the control cabinet, and the support frame is equipped with a top positioning block for the control cabinet. The bottom positioning block of the control cabinet is connected to the bottom surface of the control cabinet with bolts through the bottom bracket of the control cabinet, and the top positioning block of the control cabinet is connected to the top surface of the control cabinet with bolts through the top tie rod of the control cabinet. This installation type has good overall rigidity and is easy to assemble and disassemble. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a multi-stage centrifugal compressor according to the present invention; Figure 2 This is a top view schematic diagram of the structure of a multi-stage centrifugal compressor according to the present invention; Figure 3 This is a schematic diagram of the main base portion of a multi-stage centrifugal compressor structure according to the present invention; Figure 4 This is a schematic diagram of the supporting frame portion in a multi-stage centrifugal compressor structure according to the present invention; Figure 5 This is a schematic diagram of the compressor body in a multi-stage centrifugal compressor structure according to the present invention; Figure 6 This is a schematic diagram of the control cabinet section in a multi-stage centrifugal compressor structure according to the present invention; Figure 7 This is a side view of the control cabinet portion in the structure of a multi-stage centrifugal compressor according to the present invention; Figure 8 This is a top view of the main base portion of a multi-stage centrifugal compressor structure according to the present invention; Figure 9 This is a schematic diagram of the temperature measuring instrument connector in a multi-stage centrifugal compressor structure according to the present invention.

[0017] In the diagram, 100 is the main skid; 1 is the compressor body; 10 is the input shaft; 11 is the first and second stage rotors; 11a is the first stage impeller; 11b is the second stage impeller; 12 is the third and fourth stage rotors; 12a is the third stage impeller; 12b is the fourth stage impeller; 13 is the first stage stator; 14 is the second stage stator; 15 is the third stage stator; 16 is the fourth stage stator; 17 is the sealing device; 17a is the gas seal; and 17b is the oil seal. 200. Cooler skid; 2. Gas cooler; 21. Primary cooler; 22. Secondary cooler; 23. Tertiary cooler; 24. Quaternary cooler; 3. Gas pipeline; 30. Temperature measuring instrument connector; 31. Inlet pipeline; 32. Interstage pipeline between primary and secondary stages; 33. Interstage pipeline between tertiary and quaternary stages; 34. Outlet pipeline; 4. Lubricating oil station; 41. Lubricating oil tank; 41a. Tank bottom plate; 41b. Main body oil return port; 41c. Motor oil return port; 42. Oil cooler; 43. Oil supply pipeline; 44. Motor oil return pipeline; 5. Main body base; 51. Cooler positioning block; 52. Oil cooler positioning block; 53. Oil tank positioning block; 54. Base positioning pin hole; 55. Cabinet bottom positioning block; 6. Support frame; 61. Compressor positioning block; 62. Motor positioning block; 63. Main body oil return pipeline; 64. Frame positioning pin hole; 65. Cabinet top positioning block; 7. Control cabinet; 71. Cabinet bottom bracket; 72. Cabinet top tie rod; 8. Cooler base; 9. Main motor; 91. Output end. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. These embodiments do not constitute a limitation of the present invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application.

[0019] A multi-stage centrifugal compressor structure, such as Figure 1 and Figure 2 As shown, it includes a main skid 100 and a cooler skid 200. The main skid 100 includes a main base 5 for support and positioning. A support frame 6 is bolted to the main base 5. The top of the support frame 6 is connected to the compressor body 1 and the main motor 9. The main motor 9 drives the compressor body 1 to work. Among them, such as Figure 3 and Figure 4 As shown, the main base 5 is fixed with a base positioning pin hole 54, and the support frame 6 is provided with a frame positioning pin hole 64. The base positioning pin hole 54 and the frame positioning pin hole 64 are connected by positioning pins to facilitate easy disassembly and assembly during later maintenance. The support frame 6 is fixed with a compressor positioning block 61 and a motor positioning block 62. The compressor body 1 is bolted on the compressor positioning block 61, and the main motor 9 is bolted on the motor positioning block 62.

[0020] like Figure 2 As shown, the compressor body 1 is provided with several compression stage units, including a first compression stage, a second compression stage, a third compression stage, and a fourth compression stage in sequence. The output end of the compression stage unit is connected to the corresponding cooling unit, including a first-stage cooler 21, a second-stage cooler 22, a third-stage cooler 23, and a fourth-stage cooler 24 in sequence. The cooling unit is connected between the compressor units to realize the cooling work after compression. In this embodiment, the main body base 5 is connected to the primary cooler 21, the secondary cooler 22 and the lubricating oil station 4 located in the support frame 6. The lubricating oil station 4 supplies oil to the compressor body 1 and the main motor 9. The tertiary cooler 23 and the quaternary cooler 24 are connected to the cooler skid 200. The cooler skid 200 is located on one side of the main body skid 100 and includes a cooler base 8 for support and positioning. The tertiary cooler 23 and the quaternary cooler 24 in the gas cooler 2 are fixed on the cooler base 8. Specifically, in the gas cooler 2, the first-stage cooler 21 and the second-stage cooler 22 are horizontally arranged side by side on the main body base 5, while the third-stage cooler 23 and the fourth-stage cooler 24 are vertically arranged on the cooler skid 200, so that the cooler base 8, the third-stage cooler 23 and the fourth-stage cooler 24 are arranged vertically from bottom to top, reducing the floor space occupied.

[0021] like Figure 1 As shown, the lubricating oil station 4 includes a lubricating oil tank 41, an oil cooler 42, an oil supply line 43, and a motor return oil line 44. The lubricating oil in the lubricating oil tank 41 is supplied to the compressor body 1 and the main motor 9 after passing through the oil cooler 42. The lubricating oil tank 41 is connected to the oil tank bottom plate 41a, the main body oil return port 41b, and the motor oil return port 41c. The lubricating oil station 4 supplies oil to the compressor body 1 and the main motor 9 through the oil supply pipeline 43. The main body oil return pipeline 63 is connected to the support frame 6. The main body oil return pipeline 63 connects the compressor body 1 and the main body oil return port 41b on the lubricating oil tank 41. The main motor 9 and the motor oil return port 41c on the lubricating oil tank 41 are connected by the motor oil return pipeline 44. The bottom plate of the lubricating oil tank 41 is double-inclined so that the sludge discharge is collected at one point for easy cleaning.

[0022] like Figure 3 and Figure 4 As shown, a cooler positioning block 51, an oil cooling positioning block 52, and an oil tank positioning block 53 are fixed on the main body base 5. The first-stage cooler 21 and the second-stage cooler 22 of the gas cooler 2 are bolted on the cooler positioning block 51. The oil cooler 42 is bolted on the oil cooling positioning block 52. The lubricating oil tank 41 of the lubricating oil station 4 is bolted on the oil tank positioning block 53.

[0023] like Figure 2 As shown, the main skid 100 and the cooler skid 200 are provided with gas pipes 3. The gas pipes 3 include an inlet pipe 31 connected to the inlet end of a compression stage, an interstage pipe connected between compression stage units, and an outlet pipe 34 connected to the outlet end of the fourth compression stage. Specifically, the interstage piping includes first and second stage interstage piping 32 and third and fourth stage interstage piping 33, which are connected between the corresponding compression stage units. The corresponding cooling units are connected to each interstage piping and the outlet piping 34 (the fourth-stage cooler 24 on the cooler skid 200 is connected in the outlet piping 34). The inlet piping 31 and the first and second stage interstage piping 32 are installed on the main skid 100. The third and fourth stage interstage piping 33 connects the main skid 100 and the cooler skid 200, and is equipped with expansion joints and pipe clamps to counteract the blind plate force.

[0024] like Figure 5 As shown, the compressor body 1 includes an input shaft 10, a first-stage stator 13, a second-stage stator 14, a third-stage stator 15, a fourth-stage stator 16, and a sealing device 17. The output end of the main motor 9 is connected to the input shaft 10 of the compressor body 1 via a coupling. Preferably, the coupling can be a diaphragm coupling. The input shaft 10 drives the first and second-stage rotors 11 and the third and fourth-stage rotors 12. The first and second-stage rotors 11 are respectively connected to the first-stage impeller 11a and the second-stage impeller 11b at both ends, and the third and fourth-stage rotors 12 are respectively connected to the third-stage impeller 12a and the fourth-stage impeller 12b at both ends. The compression stage unit includes corresponding stators and impellers. Specifically, the input shaft 10, the first and second stage rotors 11, and the third and fourth stage rotors 12 are driven by gear meshing. The first stage impeller 11a, the second stage impeller 11b, the third stage impeller 12a, and the fourth stage impeller 12b, together with the first stage stator 13, the second stage stator 14, the third stage stator 15, and the fourth stage stator 16, respectively, form the first, second, third, and fourth compression stages to perform work on the process gas and increase its pressure and temperature. The first, second, third, and fourth compression stages are connected in series through interstage pipes via the first stage cooler 21, the second stage cooler 22, the third stage cooler 23, and the fourth stage cooler 24 to achieve the stepwise isothermal compression of the process gas. The volute of the stator adopts an external volute design, which reduces one flow loss compared to the internal volute design and can effectively improve aerodynamic efficiency; and a sealing device 17 is installed at the rear plate of each impeller, including an air seal 17a and an oil seal 17b in sequence to prevent air and oil leakage. Preferably, the air seal 17a adopts a carbon ring structure and the oil seal 17b adopts a comb tooth structure.

[0025] like Figures 6-8 As shown, the control cabinet 7 is integrated on the main body skid 100 in a modular installation manner. The bottom positioning block 55 is connected to the main body base 5, and the support frame 6 is provided with the top positioning block 65. The control cabinet 7 is connected through the bottom positioning block 55 and the top positioning block 65. Specifically, the bottom positioning block 55 is bolted to the bottom of the control cabinet 7 via the bottom bracket 71, and the top positioning block 65 is bolted to the top of the control cabinet 7 via the top tie rod 72. This installation method has good overall rigidity and is easy to assemble and disassemble.

[0026] like Figure 9As shown, temperature measuring instrument connectors 30 are arranged on all gas pipelines 3. The connectors adopt a fully enclosed installation type to protect the temperature measuring probe from being blown and broken by the high-speed, high-pressure flow of process gas.

[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within the scope of its essence and protection. Such modifications or equivalent substitutions should also be considered to fall within the protection scope of the present invention.

Claims

1. A multi-stage centrifugal compressor structure, characterized in that: It includes a main skid and a cooler skid. The main skid includes a main base, on which a support frame is connected. The top of the support frame is connected to the compressor body and the main motor, and the main motor drives the compressor body to work. The compressor body is provided with several compression stage units, including a first compression stage, a second compression stage, a third compression stage, and a fourth compression stage in sequence. The output end of the compression stage unit is connected to the corresponding cooling unit, including a first-stage cooler, a second-stage cooler, a third-stage cooler, and a fourth-stage cooler in sequence. The main base is connected to the primary cooler, secondary cooler and lubrication station located in the support frame. The lubrication station supplies oil to the compressor body and main motor. The tertiary cooler and quaternary cooler are connected to the cooler skid.

2. The structure of a multi-stage centrifugal compressor according to claim 1, characterized in that: The primary and secondary coolers are horizontally arranged side by side on the main base, while the tertiary and quaternary coolers are vertically distributed on the cooler skids.

3. The structure of a multi-stage centrifugal compressor according to claim 1 or 2, characterized in that: The main base is provided with a base positioning pin hole, and the support frame is provided with a frame positioning pin hole. The base positioning pin hole and the frame positioning pin hole are connected by a positioning pin.

4. The structure of a multi-stage centrifugal compressor according to claim 1, characterized in that: The main skid and cooler skid are equipped with gas pipelines, which include an inlet pipeline connected to the inlet end of a compression stage, an interstage pipeline connected between compression stage units, and an outlet pipeline connected to the outlet end of a fourth compression stage.

5. The structure of a multi-stage centrifugal compressor according to claim 4, characterized in that: The gas pipeline is equipped with several fully enclosed temperature measuring instrument connectors.

6. The structure of a multi-stage centrifugal compressor according to claim 1, characterized in that: The compressor body includes an input shaft, a first-stage stator, a second-stage stator, a third-stage stator, and a fourth-stage stator. The input shaft drives the first-stage and second-stage rotors and the third-stage and fourth-stage rotors. The first-stage and second-stage rotors are respectively connected to the first-stage impeller and the second-stage impeller at both ends. The third-stage and fourth-stage rotors are respectively connected to the third-stage impeller and the fourth-stage impeller at both ends. The compression stage unit includes a corresponding stator and impeller.

7. The structure of a multi-stage centrifugal process compressor according to claim 1, characterized in that: The lubrication station includes a lubrication oil tank and an oil cooler. The lubrication oil in the lubrication oil tank is supplied to the compressor body and main motor after passing through the oil cooler.

8. The structure of a multi-stage centrifugal process compressor according to claim 1 or 7, characterized in that: The main base is connected to the cabinet bottom positioning block, and the support frame is provided with the cabinet top positioning block. The control cabinet is connected through the cabinet bottom positioning block and the cabinet top positioning block.

9. The structure of a multi-stage centrifugal compressor according to claim 6, characterized in that: The stator volute in the compressor body adopts an external volute type.

10. The structure of a multi-stage centrifugal process compressor according to claim 6, characterized in that: The bottom plate of the lubricating oil tank is double-sloped.

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