Cantilever type steam expansion and compression all-in-one machine
Patent Information
- Application Number
- CN202520554461.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-03-27
AI Technical Summary
Existing industrial steam waste heat recovery solutions suffer from problems such as equipment redundancy, low efficiency, and insufficient economic viability. In particular, traditional solutions require separate configuration of steam turbines and compressors, resulting in complex systems, large footprints, high mechanical losses, and low waste heat recovery rates.
The cantilevered steam expansion and compression unit integrates the steam turbine and centrifugal compressor. The impeller is directly driven by the cantilevered rotor to achieve the integration of steam expansion and exhaust steam compression functions. It adopts a sealed structure to prevent wet steam intrusion, uses moisture-resistant and corrosion-resistant materials and backward-curved blade design, and integrates a condensate drainage system.
It increases the waste heat recovery rate to 75%-85%, reduces system complexity and equipment footprint, significantly reduces energy consumption, and improves economic efficiency.
Smart Images
Figure CN223767570U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of industrial steam energy recovery technology, specifically an expansion compressor that integrates a cantilever steam turbine and a centrifugal compressor to compress and recycle low-pressure waste steam (waste heat steam). It is suitable for the efficient recovery and reuse of low-grade steam in industries such as petrochemical, power, and metallurgy. Background Technology
[0002] Industrial production often generates large amounts of low-pressure waste steam (e.g., 0.3-0.8 MPa), which, when directly emitted, results in energy waste. Traditional waste heat steam recovery schemes have the following problems:
[0003] 1. Equipment redundancy: A separate turbine-driven compressor or motor-driven compressor needs to be configured, making the system complex and occupying a large area;
[0004] 2. Low efficiency: Multi-stage transmission leads to mechanical losses, and temperature rise control during steam compression is difficult;
[0005] 3. Insufficient economic efficiency: The equipment investment is high, but the waste heat recovery rate is only 50%-60%, and the investment payback period is long. Utility Model Content
[0006] To address the shortcomings of existing technologies, this utility model provides a cantilevered steam expansion compressor that is compact in structure, has a high energy recovery rate, and is economical.
[0007] The technical solution of this utility model is as follows:
[0008] A cantilevered steam expansion and compression integrated machine includes a steam turbine and a centrifugal compressor. The steam turbine includes a steam turbine casing and a cantilever rotor installed inside the steam turbine casing. Both ends of the cantilever rotor are supported by bearings, and one end of the cantilever rotor is a free end. A steam inlet and a steam outlet are provided on the steam turbine casing. The steam inlet is connected to high-temperature and high-pressure steam, and the steam outlet discharges expanded low-pressure steam.
[0009] The centrifugal compressor includes a compressor volute, an impeller is disposed inside the compressor volute and the impeller is fixed to the free end of the cantilever rotor, a compressor inlet is disposed in the middle of the compressor volute and the compressor inlet is connected to low-pressure exhaust steam, and a compressor outlet is disposed at the upper part of the compressor volute and the compressor outlet outputs compressed high-pressure steam.
[0010] Preferably, the cantilever rotor and the impeller are connected by a conical interference fit and are axially fixed by a fairing.
[0011] Preferably, a sealing structure is provided between the steam turbine and the centrifugal compressor. The sealing structure includes a carbon ring seal and a steam barrier chamber. The sealing structure is configured with two or more stages to prevent wet steam from entering the bearing.
[0012] Furthermore, the carbon ring seal includes a carbon ring base, a carbon ring, and a tension spring. The carbon ring base is provided with several sealing grooves, and the tension spring and carbon ring are installed in the sealing grooves. The carbon ring is tightly bound to the rotor by the tension spring and forms multiple coils. The carbon ring seal also includes a retaining groove, in which an anti-rotation pressure plate is installed.
[0013] Preferably, the impeller is made of a material resistant to moisture vapor corrosion, the blade profile of the impeller is a backward-curved design, and the number of blades of the impeller is 10-14.
[0014] Preferably, a condensate drain port is provided at the bottom of the compressor casing, and the condensate drain port is connected to a drain valve through a pipeline to achieve automatic drainage.
[0015] The beneficial effects of this utility model are as follows: by directly driving the impeller of the centrifugal compressor through the cantilever end of the steam turbine, the expansion work and waste steam compression functions are integrated into a single device, realizing the recovery and utilization of waste heat steam, improving energy recovery efficiency and reducing system complexity, and achieving the advantages of compact structure, high energy efficiency and greater economy. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of a cantilevered steam expansion and compression integrated machine according to the present invention;
[0017] Figure 2 This is a partially enlarged view of the connection between the impeller and the cantilever rotor of this utility model (showing the conical surface fit and the fairing structure);
[0018] In the diagram: 1-Turbine casing, 2-Cantilever rotor, 3-Steam inlet, 4-Steam outlet, 5-Impeller, 6-Vortex casing, 7-Compressor inlet, 8-Compressor outlet, 9-Sealing structure, 10-Condensate drain. Detailed Implementation
[0019] The present invention will be further described below with reference to embodiments and accompanying drawings:
[0020] like Figure 1 and Figure 2 As shown, the present invention provides a cantilevered steam expansion and compression integrated machine, including a steam turbine and a centrifugal compressor. The free end of the cantilever rotor 2 of the steam turbine body is integrally connected to the impeller 5 of the centrifugal compressor. A volute 6 is provided on the outside of the impeller 5. The compressor inlet 7 of the volute 6 is connected to the exhaust steam to compress and utilize the exhaust gas.
[0021] Specifically, the steam turbine includes a steam turbine casing 1, and a cantilever rotor 2 is provided inside the steam turbine casing 1. Both ends of the cantilever rotor 2 are supported by bearings, and one end of the cantilever rotor 2 is a free end. A steam inlet 3 and a steam outlet 4 are provided on the steam turbine casing 1. The steam inlet 3 is connected to high-temperature and high-pressure steam (such as 4.0-6.0 MPa), and the steam outlet 4 discharges low-pressure steam after expansion.
[0022] Specifically, the centrifugal compressor includes a compressor volute 6, an impeller 5 is disposed inside the compressor volute 6, the impeller 5 is fixed to the free end of the cantilever rotor 2, a compressor inlet 7 is disposed in the middle of the compressor volute 6, the compressor inlet 7 is connected to low-pressure exhaust steam (e.g., 0.5MPa), and a compressor outlet 8 is disposed at the upper part of the compressor volute 6, the compressor outlet 8 outputs compressed high-pressure steam (e.g., 1.5MPa).
[0023] In this embodiment, the cantilever rotor 2 and the impeller 5 are connected by a conical interference fit and are axially fixed by a fairing.
[0024] In this embodiment, a two-stage sealing structure 9 is provided between the steam turbine and the centrifugal compressor. The sealing structure 9 includes a carbon ring seal and a steam barrier cavity for introducing steam to prevent wet steam from entering the bearing.
[0025] In this embodiment, the carbon ring seal includes a carbon ring matrix, a carbon ring, and a tension spring. The carbon ring matrix is provided with several sealing grooves, and the tension spring and carbon ring are installed in the sealing grooves. The carbon ring is tightly bound to the rotor by the tension spring and forms multiple coils. The carbon ring seal also includes a retaining groove, in which an anti-rotation pressure plate is installed to prevent the carbon ring from rotating.
[0026] In this embodiment, the impeller 5 is made of a material resistant to moisture vapor corrosion, the blade profile of the impeller 5 is a backward-curved design, and the number of blades of the impeller 5 is 10-14.
[0027] In this embodiment, a condensate drain port 10 is provided at the bottom of the compressor volute 6. The condensate drain port 10 is linked with a drain valve to discharge the condensate generated during the compression process in real time.
[0028] In practical applications, this utility model achieves: 1. High-efficiency energy recovery: the centrifugal compressor is directly driven by the steam expansion work, and the measured waste heat recovery rate is increased to 75%-85%; 2. Compact system structure: external transmission components are eliminated, and the equipment footprint is reduced by 40%-50%.
[0029] In summary, this utility model integrates the high-temperature steam expansion and low-pressure exhaust steam compression functions into the same device through the integrated design of the cantilever rotor 2 of the steam turbine and the impeller 5 of the centrifugal compressor. This achieves efficient recovery and pressurization recycling of waste heat steam. Furthermore, the device has a compact structure, strong resistance to wet steam corrosion, and can significantly reduce energy consumption in industrial systems. It is suitable for energy upgrading scenarios involving low-grade steam.
[0030] This utility model may have other various embodiments. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.
Claims
1. A cantilevered vapor expansion compression all-in-one machine, characterized by: The steam turbine comprises a steam turbine shell (1) in which a cantilever rotor (2) is arranged, the cantilever rotor (2) is supported by bearings at both ends, one end of the cantilever rotor (2) is a free end, a steam inlet (3) and a steam outlet (4) are arranged on the steam turbine shell (1), the steam inlet (3) is connected with high-temperature and high-pressure steam, and the steam outlet (4) discharges expanded low-pressure steam. The centrifugal compressor comprises a compressor volute (6) in which an impeller (5) is arranged, the impeller (5) is fixed to the free end of the cantilever rotor (2), a compressor inlet (7) is arranged in the middle of the compressor volute (6), the compressor inlet (7) is connected with low-pressure exhaust steam, a compressor outlet (8) is arranged on the upper part of the compressor volute (6), and the compressor outlet (8) outputs compressed high-pressure steam.
2. The cantilevered vapor expansion compression all-in-one machine of claim 1, wherein: The cantilever rotor (2) and the impeller (5) are connected through conical surface interference fit, and are axially fixed through a fairing.
3. The cantilevered vapor expansion compression all-in-one machine of claim 1, wherein: A sealing structure (9) is arranged between the steam turbine and the centrifugal compressor, the sealing structure (9) comprises carbon ring sealing and a steam blocking cavity.
4. The cantilevered vapor expansion compression all-in-one machine of claim 3, wherein: The sealing structure (9) is arranged in two or more stages.
5. The cantilevered vapor expansion compression all-in-one machine of claim 3, wherein: The carbon ring sealing comprises a carbon ring base, a carbon ring and a tension spring, a plurality of sealing grooves are arranged in the carbon ring base, the tension spring and the carbon ring are arranged in the sealing grooves, the carbon ring is tightly clamped on the rotor through the tension spring and is arranged in multiple turns.
6. The cantilevered vapor expansion compression all-in-one machine of claim 5, wherein: The carbon ring sealing further comprises a clamping groove in which an anti-rotation pressing plate is arranged.
7. The cantilevered vapor expansion compression all-in-one machine of claim 1, wherein: The impeller (5) is made of a material resistant to wet steam corrosion.
8. The cantilevered vapor expansion compression all-in-one machine of claim 1, wherein: The blade profile of the impeller (5) is designed in a backward bending type.
9. The cantilevered vapor expansion compression all-in-one machine of claim 1, wherein: The number of blades of the impeller (5) is 10-14.
10. The cantilevered vapor expansion compression all-in-one machine according to any one of claims 1 to 9, characterized in that: A condensate discharge port (10) is arranged at the bottom of the compressor volute (6), and the condensate discharge port (10) is connected with a drain valve through a pipeline.