CN114087035A - Low-parameter reheating condensing steam turbine - Google Patents
Low-parameter reheating condensing steam turbine Download PDFInfo
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- CN114087035A CN114087035A CN202111280963.8A CN202111280963A CN114087035A CN 114087035 A CN114087035 A CN 114087035A CN 202111280963 A CN202111280963 A CN 202111280963A CN 114087035 A CN114087035 A CN 114087035A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention relates to a low-parameter reheat condensing steam turbine, which comprises a cylinder, a front bearing seat, a rotor, a front supporting bearing, a rear supporting bearing and a rear bearing seat, wherein the front end of the cylinder is lapped on the front bearing seat, the rotor penetrates through the interior of the cylinder, the front supporting bearing is sleeved at the front end of the rotor, the rear supporting bearing is sleeved at the rear end of the rotor, a multi-stage impeller is arranged on the outer wall of the rotor, a main steam interface and a reheat steam interface are arranged in the middle of the cylinder, the main steam interface is suitable for introducing high-pressure steam, and the reheat steam interface is suitable for introducing low-pressure steam. The unit adopts the mode of reheating can effectively solve the problems that the superheat degree of waste heat power generation steam is low, the final stage humidity of the steam turbine is high, the wet steam loss of the final stage blade is large, the blade water erosion and the like, and meanwhile, the safety of the unit can be improved.
Description
Technical Field
The invention relates to the technical field of steam turbines, in particular to a low-parameter reheating condensing steam turbine.
Background
With the distribution and implementation of the national energy law and the increasing shortage of world energy, the energy-saving work of enterprises becomes more and more important. As early as 1996, the state institute has made and released a series of policies for comprehensive utilization of resources, and various existing resources must be saved and reasonably utilized, so that the occupation and consumption of resources are reduced by thousands of means. At present, in the industries of cement, steel, petrochemical industry, building materials, sugar manufacturing and the like, a large amount of low-grade waste heat is generated in the production process, and comprises low-grade flue gas, steam, hot water and the like, and the heat is low in grade, large in quantity, wide in distribution and incapable of being completely utilized. The low-parameter waste heat is recycled for power generation, so that the energy consumption can be effectively reduced, the temperature of exhaust emission is reduced, the pollution of production to the environment is effectively reduced, the energy-saving and environment-friendly significance is achieved, and the popularization value and the application prospect are great.
With the development of waste heat power generation technology, the parameters of waste heat and waste steam are improved, for example, in the power generation of a cement kiln, the parameters of low-pressure steam of the first generation technology are 0.69 MPa-1.27 MPa and 280-330 ℃; the second generation technology parameter is upgraded to 1.27 MPa-3.43 MPa, 340-380 ℃, so that the efficiency of the steam turbine is higher. Secondly, the superheat degree of the waste heat power generation steam is low, so that the final stage humidity of the steam turbine is high, the wet steam loss of the final stage blade is high, and the problems of blade water erosion and the like can occur, so that the safe operation of the unit is influenced.
For the reasons, a low-parameter reheat condensing steam turbine is needed for better energy conservation and emission reduction.
Disclosure of Invention
The invention provides a low-parameter reheat condensing steam turbine aiming at the technical problems in the prior art.
The technical scheme for solving the technical problems is as follows: the utility model provides a low parameter reheat condensing steam turbine, includes cylinder, front bearing seat, rotor, preceding support bearing, back support bearing, rear bearing seat, the front end overlap joint of cylinder is in on the front bearing seat, the rotor runs through the inside of cylinder, preceding support bearing housing is established the front end of rotor, back support bearing housing is established the rear end of rotor, the outer wall of rotor is equipped with multistage impeller, the middle part of cylinder is provided with main vapour interface, reheat steam interface, main vapour interface is suitable for letting in high pressure steam, reheat steam interface is suitable for letting in low pressure steam.
Preferably, the low parameter reheat condensing steam turbine described above, wherein the front support bearing and the rear support bearing are both elliptical pad bearings.
Preferably, in the low-parameter reheat condensing steam turbine, a plurality of partition plates are arranged in the cylinder.
Preferably, the low parameter reheat condensing steam turbine described above, wherein a main steam adjusting combination valve is provided at a front end of the cylinder.
Preferably, in the above low-parameter reheat condensing steam turbine, the cylinder includes a front cylinder and a rear cylinder, an intermediate air seal is provided between the front cylinder and the rear cylinder, the main steam port is communicated with the front cylinder, and the reheat steam port is communicated with the rear cylinder.
Preferably, in the low-parameter reheat condensing steam turbine, the rear cylinder and the rear bearing block are of an integral welded structure.
The invention has the beneficial effects that:
1. the front end of the cylinder is provided with a main steam adjusting combined valve and two medium-pressure combined steam valves which are arranged on two sides of the cylinder, and the cylinder is provided with a main steam interface and a reheat steam interface.
2. The unit adopts a throttling steam distribution mode, all steam entering the unit enters a first-stage nozzle cascade through a regulating valve which is synchronously opened and closed, a plurality of regulating valves of the steam turbine are synchronously opened and closed, the unit has no regulating stage, the first stage is full-cycle steam inlet, when the steam turbine works under rated power, the throttling regulating valve is fully opened, throttling loss is basically avoided, and the efficiency is higher at the moment.
3. The unit adopts the mode of reheating can effectively promote unit efficiency and unit generated energy.
4. The unit adopts the mode of reheating can effectively solve the problems that the superheat degree of waste heat power generation steam is low, the final stage humidity of the steam turbine is high, the wet steam loss of the final stage blade is large, the blade water erosion and the like, and meanwhile, the safety of the unit can be improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a side view of the present invention;
fig. 4 is a top view of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the high-pressure gas turbine generator comprises a front bearing seat, 2, a front supporting bearing, 3, a high-pressure front steam seal, 4, a front cylinder, 5, a partition plate sleeve, 6, an impeller, 7, a partition plate, 8, a rear cylinder, 9, a rear steam seal, 10, a rear supporting bearing, 11, a coupler, 12, a barring gear, 13, a generator front bearing, 14, a rear seat frame, 15, a rotor, 16 and a front seat frame.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 4, a low-parameter reheat condensing steam turbine includes a cylinder, a front bearing housing 1, a rotor 15, a front support bearing 2, a rear support bearing 10, and a rear bearing housing. The rear end of the rotor 15 is connected with a generator rotating shaft through a coupler 11, and a generator front bearing 13 is sleeved outside the generator rotating shaft and used for supporting the generator rotating shaft.
The front end of the cylinder is lapped on the front bearing seat 1, the rotor 15 penetrates through the inside of the cylinder, and the side coupler of the steam turbine is sleeved on the rotor 15. The front support bearing 2 is sleeved at the front end of the rotor 15, and the rear support bearing 10 is sleeved at the rear end of the rotor 15 and is used for supporting the rotor 15. The outer wall of the rotor 15 is provided with a multi-stage impeller 6 which adopts a monobloc forging or sleeving structure. The middle part of cylinder is provided with main vapour interface, reheat steam interface, and the main vapour interface is used for letting in high pressure steam, and the reheat steam interface is used for letting in low pressure steam. The cylinder comprises a front cylinder 4 and a rear cylinder 8, the front cylinder 4 is connected with the rear cylinder 8 through a vertical flange, a middle air seal is arranged between the front cylinder 4 and the rear cylinder 8, the middle air seal isolates the front cylinder 4 from the rear cylinder 8, a main steam interface is communicated with the front cylinder 4, and a reheat steam interface is communicated with the rear cylinder 8.
High-pressure steam enters the cylinder from a main steam interface at the middle bottom of the cylinder and flows to the machine head, and reheat steam (containing supplementary steam) enters the cylinder from a reheat steam interface at the middle part and flows to the generator side. The reheat steam is formed by reheating tail gas exhausted after high-pressure steam introduced into a main steam interface passes through an impeller 6 in a front cylinder 4, most energy is converted into kinetic energy of a rotor 15 when the high-pressure steam passes through the front cylinder 4, so that the air pressure and the temperature of the high-pressure steam are both reduced when the high-pressure steam is exhausted, the humidity of the last stage of the steam turbine is high due to low heat of waste heat power generation steam, the wet steam loss of the last stage blade is high, and the water erosion of the blade is avoided, the tail gas is heated again when the high-pressure steam introduced into the main steam interface is exhausted through the front cylinder 4, and then the reheat steam interface is introduced for secondary utilization.
The front cylinder 4 is a lower cat-claw bearing structure and is supported on platforms at two sides of the rear part of the front bearing seat 1. The cylinder is used for installing a high-pressure front steam seal 3, a high-medium pressure stage partition plate 7 and a partition plate sleeve 5. The rear cylinder 8 and the rear bearing seat are of an integrated welding structure, and a downward steam exhaust mode is adopted. A rear support bearing 10 is mounted in the rear bearing block. The rear cylinder 8 is supported by the platens on the left and right sides and the middle platen at the bottom of the rear bearing seat. The rear bearing block is mounted on the rear seat frame 14.
The front bearing seat 1 is a welded structure, and a front supporting bearing 2 for supporting a rotor 15, a shaft displacement sensor, a rotating speed sensor, a vibration monitoring sensor and other adjusting and controlling system parts are arranged inside and outside the front bearing seat. The front bearing block 1 uses an independent oil source. The front bearing block 1 is mounted on a front seat frame 16. The front support bearing 2 and the rear support bearing 10 are both elliptical pad bearings.
Two platforms are arranged on two sides of the rear part of the front bearing seat 1 and are used for supporting the cat's claws of the front cylinder 4. The lower cat's claw of the cylinder is placed on the cushion block and fixed by a bolt. The cat claw and the transverse key are fixed on the platform of the front bearing seat 1 by the positioning bolt and positioned by the positioning bolt. In order not to affect the thermal expansion, a gap is left between the briquette and the cat's claw.
The high-pressure front steam seal 3 is arranged in the front cylinder 4, the rear steam seal 9 is arranged in the rear cylinder 8, and the steam seal of the steam turbine has the main functions of preventing steam from leaking outwards and preventing air from entering the rear cylinder along the shaft end to damage the vacuum of the condenser. The diaphragm gland seals are used to prevent inter-stage steam leakage to improve stage efficiency. The high-pressure front steam seal 3, the rear steam seal 9 and the clapboard steam seal are all of comb-tooth-shaped structures. Each steam seal is divided into 4 sections or 6 sections along the circumference, and each section is provided with a spring piece. Once the gland sealing teeth and the shaft are collided, the gland sealing arc section can do radial yielding, and the friction between the dynamic part and the static part is reduced.
The turning gear 12 is a mechanical device for driving the rotor to rotate slowly. When the vehicle is turned, the cylinder and the rotor 15 are uniformly preheated or cooled, and the deformation and the thermal stress of the cylinder and the rotor are reduced.
The low-parameter reheat condensing steam turbine provided by the invention has the following beneficial effects or advantages:
1. the front end of the cylinder is provided with a main steam adjusting combined valve and two medium-pressure combined steam valves which are arranged on two sides of the cylinder, and the cylinder is provided with a main steam interface and a reheat steam interface.
2. The unit adopts a throttling steam distribution mode, all steam entering the unit enters a first-stage nozzle cascade through a regulating valve which is synchronously opened and closed, a plurality of regulating valves of the steam turbine are synchronously opened and closed, the unit has no regulating stage, the first stage is full-cycle steam inlet, when the steam turbine works under rated power, the throttling regulating valve is fully opened, throttling loss is basically avoided, and the efficiency is higher at the moment.
3. The unit adopts the mode of reheating can effectively promote unit efficiency and unit generated energy.
4. The unit adopts the mode of reheating can effectively solve the problems that the superheat degree of waste heat power generation steam is low, the final stage humidity of the steam turbine is high, the wet steam loss of the final stage blade is large, the blade water erosion and the like, and meanwhile, the safety of the unit can be improved.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or they may be connected through two or more elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (6)
1. A low parameter reheat condensing steam turbine is characterized in that: including cylinder, front axle bearing (1), rotor (15), preceding support bearing (2), back support bearing (10), rear axle bearing, the front end overlap joint of cylinder is in on front axle bearing (1), rotor (15) run through the inside of cylinder, preceding support bearing (2) cover is established the front end of rotor (15), back support bearing (10) cover is established the rear end of rotor (15), the outer wall of rotor (15) is equipped with multistage impeller, the middle part of cylinder is provided with main vapour interface, reheat steam interface, main vapour interface is suitable for letting in high-pressure steam, reheat steam interface is suitable for letting in low-pressure steam.
2. The low parameter reheat condensing steam turbine of claim 1, wherein: the front supporting bearing (2) and the rear supporting bearing (10) are both oval pad bearings.
3. The low parameter reheat condensing steam turbine of claim 1, wherein: a plurality of partition plates (7) are arranged in the cylinder.
4. The low parameter reheat condensing steam turbine of claim 1, wherein: the front end of the cylinder is provided with a main steam adjusting combined valve.
5. The low parameter reheat condensing steam turbine of claim 1, wherein: the cylinder includes preceding cylinder (4), back cylinder (8), preceding cylinder (4) with be provided with middle atmoseal between back cylinder (8), the main steam interface with preceding cylinder (4) communicate with each other, reheat steam interface with back cylinder (8) communicate with each other.
6. The low parameter reheat condensing steam turbine of claim 5, wherein: the rear cylinder (8) and the rear bearing seat are of an integrated welding structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111280963.8A CN114087035A (en) | 2021-10-30 | 2021-10-30 | Low-parameter reheating condensing steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111280963.8A CN114087035A (en) | 2021-10-30 | 2021-10-30 | Low-parameter reheating condensing steam turbine |
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| Publication Number | Publication Date |
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| CN114087035A true CN114087035A (en) | 2022-02-25 |
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| CN202111280963.8A Pending CN114087035A (en) | 2021-10-30 | 2021-10-30 | Low-parameter reheating condensing steam turbine |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2644678Y (en) * | 2003-08-16 | 2004-09-29 | 黄少斌 | Stator cylinder body integrated structure of eddy current wheel type steam turbine |
| US20040261417A1 (en) * | 2003-04-30 | 2004-12-30 | Kabushiki Kaisha Toshiba | Steam turbine, steam turbine plant and method of operating a steam turbine in a steam turbine plant |
| WO2015196869A1 (en) * | 2014-06-25 | 2015-12-30 | 北京越麓咨询有限责任公司 | Built-in steam reheater of multi-stage impulse steam turbine |
| CN105370326A (en) * | 2015-12-04 | 2016-03-02 | 哈尔滨汽轮机厂有限责任公司 | 660MW-grade primary intermediate reheat high-backpressure wet-condensing steam turbine unit |
| CN109162765A (en) * | 2018-08-23 | 2019-01-08 | 哈尔滨汽轮机厂有限责任公司 | A kind of high revolving speed steam turbine of resuperheat of super-pressure 45MW |
| CN112627911A (en) * | 2020-12-30 | 2021-04-09 | 哈尔滨汽轮机厂有限责任公司 | 100MW subcritical single-cylinder single-exhaust steam turbine |
-
2021
- 2021-10-30 CN CN202111280963.8A patent/CN114087035A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040261417A1 (en) * | 2003-04-30 | 2004-12-30 | Kabushiki Kaisha Toshiba | Steam turbine, steam turbine plant and method of operating a steam turbine in a steam turbine plant |
| CN2644678Y (en) * | 2003-08-16 | 2004-09-29 | 黄少斌 | Stator cylinder body integrated structure of eddy current wheel type steam turbine |
| WO2015196869A1 (en) * | 2014-06-25 | 2015-12-30 | 北京越麓咨询有限责任公司 | Built-in steam reheater of multi-stage impulse steam turbine |
| CN105370326A (en) * | 2015-12-04 | 2016-03-02 | 哈尔滨汽轮机厂有限责任公司 | 660MW-grade primary intermediate reheat high-backpressure wet-condensing steam turbine unit |
| CN109162765A (en) * | 2018-08-23 | 2019-01-08 | 哈尔滨汽轮机厂有限责任公司 | A kind of high revolving speed steam turbine of resuperheat of super-pressure 45MW |
| CN112627911A (en) * | 2020-12-30 | 2021-04-09 | 哈尔滨汽轮机厂有限责任公司 | 100MW subcritical single-cylinder single-exhaust steam turbine |
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