CN213899060U - Variable-rotating-speed designed main circulation water-feeding pump steam turbine - Google Patents
Variable-rotating-speed designed main circulation water-feeding pump steam turbine Download PDFInfo
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- CN213899060U CN213899060U CN202023336361.3U CN202023336361U CN213899060U CN 213899060 U CN213899060 U CN 213899060U CN 202023336361 U CN202023336361 U CN 202023336361U CN 213899060 U CN213899060 U CN 213899060U
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Abstract
The utility model provides a variable rotational speed design main loop water-feeding pump steam turbine, belongs to the steam turbine field of making, the utility model discloses a solve present secondary reheat steam turbine and have steam quality loss, have the problem of injury to the high pressure feed water heater safe operation at different levels. It includes: the front bearing box and the rear bearing box are respectively arranged at the front end and the rear end of the cylinder outer cylinder; the left side and the right side of the cylinder outer cylinder are respectively provided with a main steam adjusting joint valve, and the main steam adjusting joint valves are directly connected with the cylinder outer cylinder and the cylinder inner cylinder; the cylinder inner cylinder and the five-stage clapboard sleeve are sequentially arranged to form a five-stage steam extraction chamber and a steam exhaust chamber; the front bearing box is connected with a water pump, and the rear bearing box is connected with a variable-speed generator; the relative dead point and the absolute dead point are both arranged at the rear bearing box, the rear bearing box of the cylinder outer cylinder expands towards the steam inlet side as the absolute dead point, and the rear bearing box of the rotor expands towards the steam outlet side as the relative dead point. The utility model is used for high parameter secondary reheat steam turbine system.
Description
Technical Field
The utility model relates to a variable rotational speed designs main loop water-feeding pump steam turbine belongs to the steam turbine field of making.
Background
In order to construct a clean low-carbon environment-friendly energy utilization system and improve the circulating heat efficiency of the coal-electricity steam turbine, the high-parameter secondary reheating design becomes a main research direction. Therefore, the design steam parameters of the double reheating steam turbine are continuously improved, and meanwhile, the design and manufacture of the high-parameter steam turbine with the temperature of 650 ℃ and the high-parameter steam turbine with the temperature of 700 ℃ and the innovation and application technology development of the system are promoted. But the high parameter secondary reheat steam turbine of labour all adopts conventional regenerative system design, reheat steam temperature promotes to above 630 ℃, the first order backheat extraction after the steam reheat is because do not produce higher pressure drop and temperature drop in the through-flow and form kinetic energy conversion, lead to the secondary reheat steam turbine 2 nd, 4, 5 level backheat extraction temperature is higher, there is certain steam quality loss, the performance gain that the initial parameter of underplay steam promoted and bring, and it is unfavorable to high pressure heater safe operation at different levels, it is urgent to provide innovative regenerative system equipment and use in order to improve the high parameter steam application effect of secondary reheat steam turbine.
SUMMERY OF THE UTILITY MODEL
There is steam quality loss to current secondary reheat steam turbine, has the problem of injury to the high pressure feed water heater safe operation at different levels, the utility model provides a variable rotational speed designs main loop water-feeding pump steam turbine.
The utility model relates to a variable-speed design main circulation water-feeding pump steam turbine, which comprises a main steam adjusting joint valve, a front bearing box, a rear bearing box, a cylinder outer cylinder, a cylinder inner cylinder, a five-stage clapboard sleeve and a rotor;
the front bearing box and the rear bearing box are respectively arranged at the front end and the rear end of the cylinder outer cylinder; the left side and the right side of the cylinder outer cylinder are respectively provided with a main steam adjusting joint valve, and the main steam adjusting joint valves are directly connected with the cylinder outer cylinder and the cylinder inner cylinder;
the cylinder inner cylinder and the five-stage clapboard sleeve are sequentially arranged to form a five-stage steam extraction chamber and a steam exhaust chamber;
the front bearing box is connected with a water pump, and the rear bearing box is connected with a variable-speed generator;
the rotor is supported on the bearing of the front bearing box and the bearing of the rear bearing box;
the relative dead point and the absolute dead point are both arranged at the rear bearing box, the rear bearing box of the cylinder outer cylinder expands towards the steam inlet side as the absolute dead point, and the rear bearing box of the rotor expands towards the steam outlet side as the relative dead point.
Preferably, the front bearing box is connected with the water pump through a diaphragm coupling, and the rear bearing box is connected with the variable-speed generator through the diaphragm coupling;
meanwhile, the rotor absorbs shafting expansion difference through the diaphragm coupling.
Preferably, the five-stage steam extraction chamber and the steam exhaust chamber respectively correspond to a No. 2 high-pressure steam extraction port, a No. 3 high-pressure steam extraction port, a No. 4 high-pressure steam extraction port, a No. 5 high-pressure steam extraction port and a steam port for an oxygen remover of the regenerative system, and the exhaust steam enters a No. 7 low-pressure heater.
Preferably, the front end and the rear end of the outer cylinder of the cylinder are respectively supported on the front bearing box (2) and the rear bearing box (3) by using lower cylinder claws.
Preferably, the lower half part of the cylinder outer cylinder is provided with a centering beam, and the centering beam is axially fixed with the rear bearing box.
Preferably, the cylinder outer cylinder and the front bearing box adopt a guide key form without a push-pull structure, and the cat claw can slide on the front bearing box.
Preferably, the front bearing box and the rear bearing box are arranged in a floor mode, and the front bearing box, the rear bearing box, the cylinder outer cylinder, the cylinder inner cylinder, the five-stage partition plate sleeve and the rotor are placed on the mounting and transporting support after being integrally mounted.
The utility model has the advantages that: the utility model provides a pair of variable rotational speed design main loop water-feeding pump steam turbine is applied to high parameter secondary reheat steam turbine duplex backheating system, can effectively alleviate high parameter secondary reheat steam turbine height and add the available energy loss of backheating system steam high, the backheating system equipment cost height reaches high temperature application risk scheduling problem, and can optimize main steam turbine height, intermediate pressure cylinder steam flow environment and complete machine backheat progression and rationalization temperature rise design, further improve secondary reheat unit circulation thermal efficiency, can effectively improve product market competitiveness and engineering application economy.
Drawings
FIG. 1 is a schematic structural view of a variable speed design main cycle feed water pump turbine according to the present invention;
fig. 2 is a view in the direction a of fig. 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.
The first embodiment is as follows: the embodiment is described below with reference to fig. 1 and fig. 2, and the variable-speed design main circulation water-feeding pump steam turbine of the embodiment comprises a main steam adjusting combination valve 1, a front bearing box 2, a rear bearing box 3, a cylinder outer cylinder 4, a cylinder inner cylinder 5, a five-stage partition sleeve 6 and a rotor 7;
the front bearing box 2 and the rear bearing box 3 are respectively arranged at the front end and the rear end of the cylinder outer cylinder 4; the left side and the right side of the cylinder outer cylinder 4 are respectively provided with a main steam adjusting combined valve 1, and the main steam adjusting combined valve 1 is directly connected with the cylinder outer cylinder 4 and the cylinder inner cylinder 5;
the cylinder inner cylinder 5 and the five-stage clapboard sleeve 6 are sequentially arranged to form a five-stage steam extraction chamber and a steam exhaust chamber;
the front bearing box 2 is connected with a water pump, and the rear bearing box 3 is connected with a variable-speed generator;
the rotor 7 is supported on the bearings of the front bearing box 2 and the bearings of the rear bearing box 3;
the relative dead point and the absolute dead point are both provided at the rear bearing housing 3, the cylinder outer cylinder 4 expands toward the intake side with the rear bearing housing 3 being the absolute dead point, and the rotor 7 expands toward the exhaust side with the rear bearing housing 3 being the relative dead point.
In the embodiment, a Main Cycle Turbine (MCT) is designed to be variable in rotation speed, and the operating rotation speed matches the rotation speed requirement of the feed pump. Can adapt to steam with the parameters of 10MPa and 450 ℃, has the efficiency exceeding 90 percent in a design point, and is a single-cylinder single-exhaust structure.
Further, the front bearing box 2 is connected with a water pump through a diaphragm coupling, and the rear bearing box 3 is connected with a variable-speed generator through a diaphragm coupling;
meanwhile, the rotor 7 absorbs shafting expansion difference through the diaphragm coupling.
In the embodiment, the rear bearing box 3 is connected with a variable-speed generator through a diaphragm coupling, and an output power supply is converted into a direct-current power supply through a frequency converter to be used in a factory.
Furthermore, the five-stage steam extraction chamber and the steam exhaust chamber respectively correspond to a 2# high-pressure steam extraction port 9, a 3# high-pressure steam extraction port 10, a 4# high-pressure steam extraction port 11, a 5# high-pressure steam extraction port 12 and a steam port 13 for a deaerator of the regenerative system, and the exhaust steam enters a 7# low-pressure heater 8.
In the embodiment, a steam source leads exhausted steam from an ultrahigh pressure cylinder of a main steam turbine to enter a through flow after passing through a steam inlet valve, steam is provided for 2-6 stages of regenerative steam extraction, namely 2#, 3#, 4# and 5# high-pressure heating and deaerator, by steam extraction between stages of the through flow, the exhausted steam enters a 7# low-pressure heater, the exhausted steam overflows into an 8# low-pressure heater, more overflows can enter a middle-exhaust communicating pipe, a steam extraction port of a body is indirectly arranged by an upper cylinder and a lower cylinder, the length of an MCT cylinder body is shortened, and space is saved.
Still further, the front end and the rear end of the cylinder outer cylinder 4 are supported on the front bearing housing 2 and the rear bearing housing 3 respectively by lower cylinder claws.
Still further, the lower half of the cylinder outer cylinder 4 is provided with a centering beam, and the centering beam is axially fixed with the rear bearing box 3.
Still further, the cylinder outer cylinder 4 and the front bearing box 2 adopt a guide key form without a push-pull structure, and the cat's claw can slide on the front bearing box 2.
Furthermore, the front end and the rear end of the cylinder outer cylinder 4 are respectively supported on the front bearing box 2 and the rear bearing box 3 by lower cylinder cats, the lower half part of the cylinder outer cylinder 4 is provided with a centering beam, and the centering beam is axially fixed with the front bearing box 2 and the rear bearing box 3.
Further, the front bearing box 2 and the rear bearing box 3 are arranged on the ground, and the front bearing box 2, the rear bearing box 3, the cylinder outer cylinder 4, the cylinder inner cylinder 5, the five-stage partition plate sleeve 6 and the rotor 7 are arranged on the mounting and transporting support 14 after being integrally mounted.
In the embodiment, the main steam adjusting combined valve 1 is integrally transported to the site, secondary grouting is carried out on the transport support during site installation to form a whole with a site foundation, and the unit is integrally installed.
The utility model discloses in, MCT is interior outer jar + baffle cover structure, and the structure is succinct reasonable, adapts to the steam admission parameter design, and cylinder body rigidity is good, intensity is good, thermal stress is little, adopts the height narrow flange structure to adapt to the needs of unit quick start.
The rotor is a monobloc forging rotor, and the rotor has good rigidity, and high operation safety, stability and reliability.
The unit is designed according to a 6-stage regenerative system and respectively corresponds to a 2# high-pressure heater, a 3# high-pressure heater, a 4# high-pressure heater, a 5# high-pressure heater, a deaerator and a 7# low-pressure heater of a main steam turbine, and exhaust steam overflows into a 8# low-pressure heater of the main steam turbine.
The MCT steam source is led from the ultrahigh pressure cylinder of the secondary reheating main steam turbine for steam exhaust, the rest of the main steam turbine except the 1# high steam and the regenerative steam extraction of the deaerator are all provided by the MCT, so that the regenerative steam extraction temperature can be effectively reduced, and the cost and the high-temperature application risk of regenerative system equipment, a boiler reheater and pipeline are reduced.
By applying MCT, the situation that the temperature rise of a high-pressure heater is unreasonable due to the optimal cycle parameter selection (primary reheating and secondary reheating pressure) of the main turbine can be avoided, the design of a regenerative system is further optimized, regenerative steam extraction does not exist between the high-pressure and intermediate pressure cylinder through-flow stages of the main turbine, and the through-flow efficiency can be further improved.
And the MCT drives the feed pump to operate, and the efficiency is obviously improved compared with that of a conventional feed pump turbine.
MCT adopts multi-stage small enthalpy drop reaction type design, and is arranged at intervals corresponding to the upper cylinder and the lower cylinder of the steam extraction port, so that the total family length is shortened to the maximum extent, the occupied area of the unit is reduced, the space is saved, and the capital investment is reduced on the premise of ensuring that the unit has high flow efficiency and high safety.
All the static blades and the movable blades in the through flow adopt pre-twisted assembly structures, compared with the traditional welding partition plate, the assembly structure has no welding line, the through flow deformation caused by the heat treatment after welding and soldering is avoided, the thermal stress at the welding position is not released after the operation for a period of time, and the long-term efficiency retention is better.
MCT adopts the form of full-circle steam admission, and the valve is directly connected with the cylinder, thereby effectively reducing the steam pressure loss at the inlet position and avoiding the waste of steam quality.
The MCT shafting drives the generator, and can provide the service power demand for the power station.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (7)
1. A variable-rotating-speed designed main-cycle water-feeding pump steam turbine is characterized by comprising a main steam adjusting joint valve (1), a front bearing box (2), a rear bearing box (3), an outer cylinder (4) of a cylinder, an inner cylinder (5) of the cylinder, a five-stage partition plate sleeve (6) and a rotor (7);
the front bearing box (2) and the rear bearing box (3) are respectively arranged at the front end and the rear end of the cylinder outer cylinder (4); the left side and the right side of the cylinder outer cylinder (4) are respectively provided with a main steam adjusting joint valve (1), and the main steam adjusting joint valve (1) is directly connected with the cylinder outer cylinder (4) and the cylinder inner cylinder (5);
the cylinder inner cylinder (5) and the five-stage clapboard sleeve (6) are sequentially arranged to form a five-stage steam extraction chamber and a steam exhaust chamber;
the front bearing box (2) is connected with a water pump, and the rear bearing box (3) is connected with a variable-speed generator;
the rotor (7) is supported on the bearing of the front bearing box (2) and the bearing of the rear bearing box (3);
the relative dead point and the absolute dead point are both arranged at the rear bearing box (3), the cylinder outer cylinder (4) expands towards the steam inlet side by taking the rear bearing box (3) as the absolute dead point, and the rotor (7) expands towards the steam outlet side by taking the rear bearing box (3) as the relative dead point.
2. The variable-speed design main circulation feed water pump steam turbine as claimed in claim 1, characterized in that the front bearing box (2) is connected with the water pump through a diaphragm coupling, and the rear bearing box (3) is connected with the variable-speed generator through a diaphragm coupling;
meanwhile, the rotor (7) absorbs shafting expansion difference through the diaphragm coupling.
3. The variable-speed design main-cycle feed water pump steam turbine according to claim 1, wherein the five-stage steam extraction chamber and the steam exhaust chamber respectively correspond to a 2# high-pressure steam extraction port (9), a 3# high-pressure steam extraction port (10), a 4# high-pressure steam extraction port (11), a 5# high-pressure steam extraction port (12) and a steam port (13) for a deaerator of a regenerative system, and the exhaust steam enters a 7# low-pressure heater (8).
4. A variable speed design main cycle feed water pump turbine according to claim 1, characterized in that the front and rear ends of the cylinder outer casing (4) are supported on the front bearing housing (2) and the rear bearing housing (3) using lower cylinder catpaws, respectively.
5. A variable speed design main cycle feed water pump turbine according to claim 4, characterized in that the lower half of the cylinder outer casing (4) is fitted with a centering beam, which is axially fixed to the rear bearing housing (3).
6. The variable-speed design main circulation feed water pump steam turbine as claimed in claim 5, characterized in that the cylinder outer cylinder (4) and the front bearing box (2) adopt a guide key form without a push-pull structure, and the cat's claw can slide on the front bearing box (2).
7. The variable-speed design main circulation feed water pump steam turbine is characterized in that the front bearing box (2) and the rear bearing box (3) are arranged on the ground, and the front bearing box (2), the rear bearing box (3), the cylinder outer cylinder (4), the cylinder inner cylinder (5), the five-stage partition sleeve (6) and the rotor (7) are arranged on the mounting and transporting support (14) after being integrally mounted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023336361.3U CN213899060U (en) | 2020-12-30 | 2020-12-30 | Variable-rotating-speed designed main circulation water-feeding pump steam turbine |
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| CN202023336361.3U CN213899060U (en) | 2020-12-30 | 2020-12-30 | Variable-rotating-speed designed main circulation water-feeding pump steam turbine |
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| CN213899060U true CN213899060U (en) | 2021-08-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112627910A (en) * | 2020-12-30 | 2021-04-09 | 哈尔滨汽轮机厂有限责任公司 | Variable-rotating-speed designed main circulation water-feeding pump steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112627910A (en) * | 2020-12-30 | 2021-04-09 | 哈尔滨汽轮机厂有限责任公司 | Variable-rotating-speed designed main circulation water-feeding pump steam turbine |
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