CN112627908A - Novel E-stage combined cycle steam turbine - Google Patents
Novel E-stage combined cycle steam turbine Download PDFInfo
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- CN112627908A CN112627908A CN202011595118.5A CN202011595118A CN112627908A CN 112627908 A CN112627908 A CN 112627908A CN 202011595118 A CN202011595118 A CN 202011595118A CN 112627908 A CN112627908 A CN 112627908A
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- cylinder
- steam turbine
- bearing box
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Classifications
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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
- F01D13/00—Combinations of two or more machines or engines
- F01D13/02—Working-fluid interconnection of machines or engines
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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
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
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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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/041—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector using blades
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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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/042—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector fixing blades to stators
Abstract
The invention relates to a novel E-cascade combined cycle steam turbine, which relates to a steam turbine and aims to solve the problems that the existing equivalent cascade combined cycle steam turbine is early in molding, is an impulse type unit, is low in stage efficiency, few in stage number and poor in overall performance; the thrust supporting bearing is positioned in the front bearing box, the supporting bearing is positioned in the rear bearing box, the cylinder is sleeved on the rotor, and the front end and the rear end of the cylinder are respectively supported by the front bearing box and the rear bearing box; the steam exhaust end on the right side of the cylinder is connected with the steam exhaust cylinder. The steam turbine unit is single cylinder single steam extraction design, shortens shafting length when guaranteeing the unit through-flow efficiency, under the prerequisite that guarantees the unit and have high efficiency, high security, furthest shortens unit length, practices thrift the space, reduces construction cost.
Description
Technical Field
The invention relates to a steam turbine, in particular to a novel E-stage combined cycle steam turbine, and relates to the technical field of steam turbines.
Background
The existing equivalent cascade combined cycle steam turbine is early in molding, is an impulse type unit, and has low stage efficiency, few stages, unreasonable structural design, low unit cycle efficiency, low cylinder efficiency, poor overall performance and low market competitiveness.
Disclosure of Invention
The invention provides a novel E-cascade combined cycle steam turbine, which aims to solve the problems that the existing E-cascade combined cycle steam turbine is early in forming, is an impulse type unit, is low in stage efficiency, few in stage number and poor in overall performance.
The technical scheme adopted by the invention for solving the problems is as follows:
the invention comprises a cylinder, a rotor, a front bearing box, a first thrust support bearing, a rear bearing box, a second support bearing and a steam exhaust cylinder, wherein the thrust support bearing is sleeved at the left end of the rotor, and the support bearing is sleeved at the right end of the rotor; the thrust supporting bearing is positioned in the front bearing box, the supporting bearing is positioned in the rear bearing box, the cylinder is sleeved on the rotor, and the front end and the rear end of the cylinder are respectively supported by the front bearing box and the rear bearing box; the steam exhaust end on the right side of the cylinder is connected with the steam exhaust cylinder.
Furthermore, the novel E-stage combined cycle steam turbine further comprises a centering beam, and the lower half of the cylinder is connected with the front bearing box through the centering beam.
Furthermore, the upper part of the exhaust cylinder is provided with a steam valve.
Furthermore, the novel E-stage combined cycle steam turbine further comprises a turning gear, wherein the turning gear is installed at the steam exhaust end of the cylinder and is positioned on the upper cover of the rear bearing box.
Furthermore, a high-pressure main steam adjusting combined valve is arranged at the left end of the cylinder.
Further, the upper wall of cylinder is inboard to be equipped with No. one the baffle cover, No. two baffle covers, No. three baffle covers, No. four baffle covers, No. five baffle covers, No. six baffle covers, No. seven baffle covers, No. eight baffle covers and No. nine baffle covers along its length direction.
Furthermore, the lower part of the lower half of the cylinder is provided with a steam supplementing valve.
The invention has the beneficial effects that:
1. the steam turbine unit is single cylinder single steam extraction design, shortens shafting length when guaranteeing the unit through-flow efficiency, under the prerequisite that guarantees the unit and have high efficiency, high security, furthest shortens unit length, practices thrift the space, reduces construction cost.
2. The through flow of the unit adopts a multi-stage small enthalpy drop reaction type design, thereby fundamentally improving the flow efficiency;
3. except for the low-pressure last two-stage partition plate, all the other high, medium and low-pressure static blades and movable blades adopt a pre-twisted assembly type structure, and compared with the traditional welding partition plate, the assembly type structure has no welding line, avoids welding deformation and better ensures through-flow precision;
drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a front view of the form construction of the present invention;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a side view of FIG. 5;
FIG. 5 is a diagram of the slide pin system of the present invention.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1, and the novel E-cascade combined cycle steam turbine described in the embodiment includes a cylinder 1, a rotor 2, a front bearing box 3, a first thrust support bearing 4, a rear bearing box 5, a second support bearing 6 and a steam exhaust cylinder 7, wherein the thrust support bearing 4 is sleeved at the left end of the rotor 2, and the support bearing 6 is sleeved at the right end of the rotor 2; the thrust supporting bearing 4 is positioned in the front bearing box 3, the supporting bearing 6 is positioned in the rear bearing box 5, the cylinder 1 is sleeved on the rotor 2, and the front end and the rear end of the cylinder 1 are respectively supported by the front bearing box 3 and the rear bearing box 5; the rear of the cylinder is connected to a bank of cylinders 7.
The steam turbine is a double-pressure, single-cylinder, single-shaft and reverse-acting condensing steam turbine, and the cylinder 1 is of a single-layer structure. The cylinder 1 is internally provided with a high-pressure steam chamber, a partition plate sleeve, a front steam seal, a rear steam seal and other part sleeves, and the through flow part consists of 23 stages of pressure stages.
The rotor 2 of the steam turbine is a two-pivot support, which is a first thrust support combined bearing and a second support bearing respectively, and is a three-layer elliptical bearing with a bush lining. The rotor is connected with the generator by a rigid coupling and a connecting short shaft. The rotor is of a monobloc forging and sleeving structure and is provided with 23-stage pressure-stage blades.
The steam turbine is provided with two bearing boxes, and a front bearing box 3 is internally provided with a thrust supporting bearing 4 and also provided with related part sleeves such as a main oil pump, an emergency breaking accelerator resetting device, a magnetic group transmitter, an axial displacement transmitter and the like. A second support bearing 6 is arranged in the rear bearing box. Each bearing is provided with high-pressure jacking oil, and the high-pressure jacking oil is put into the bearings to jack the rotor when the unit jigger and the steam turbine are started. The front bearing box 3 is a floor structure, and the rear bearing box 5 is assembled and welded on the exhaust cylinder 7.
The invention adopts the rear loading type novel blade profile, the blade profile has wide attack angle application range and good variable load operation characteristic, improves the rated load efficiency of the unit and simultaneously considers the economy during variable load operation.
The second embodiment is as follows: the embodiment is described with reference to fig. 1, and the novel E-cascade combined cycle steam turbine according to the embodiment further includes a centering beam 8, and the lower half of the cylinder 1 is connected with the front bearing box 3 through the centering beam 8.
The unit has a front frame 19 and a rear frame 20. All seat frames are fixed on the basis of the steam turbine by means of foundation bolts and secondary grouting. The front bearing housing 3 is seated on a front seat frame, a longitudinal key is arranged along a central axis between the front bearing housing 3 and the front seat frame, the front bearing housing 3 can move back and forth along the axis on the seat frame, the cylinder 1 pushes the front bearing housing to slide through a centering beam 8, and the front bearing housing has the functions of determining the center of the cylinder, guiding the expansion of the cylinder in the vertical direction and transmitting the pushing (pulling) force of the cylinder 1 to the front bearing housing 3 due to the thermal expansion. Two cat claws are supported on the front bearing box 3 at the lower half of the front part of the high-pressure cylinder, two sides of the exhaust cylinder 7 are supported on an exhaust cylinder seat support, a horizontal transverse key is arranged at the outer side of the exhaust cylinder for connection, a rear cylinder guide plate is arranged at the lower part of a rear bearing box 5 of the exhaust cylinder 7, and the intersection point between the transverse key and the center line of the steam turbine is the expansion dead point of the whole cylinder.
Other components and connections are the same as those in the first embodiment.
The third concrete implementation mode: the present embodiment will be described with reference to fig. 1, and the exhaust cylinder 7 of the present embodiment is provided with a main steam valve 7-1 at an upper portion thereof.
Other components are connected in the same manner as in the first or second embodiment.
The fourth concrete implementation mode: the embodiment is described with reference to fig. 1, and the novel E-stage combined cycle steam turbine according to the embodiment further includes a turning gear 8, and the turning gear 8 is installed at the steam exhaust end of the cylinder 1 and is located on the upper cover of the rear bearing housing 5.
The steam turbine barring gear is arranged on an upper cover of the rear bearing box and is a low-speed barring gear with worm and gear composite speed reduction and axial meshing. The barring gear of the unit can low-speed barring the rotor when the unit is stopped, so that the rotor is prevented from being thermally bent. When the rotation speed of the motor unit is higher than that of the turning gear, the motor unit can be automatically disengaged. And can be manually turned and automatically turned.
The exhaust gas connecting neck of the exhaust cylinder is internally provided with a low-load water spraying device to ensure the normal operation of the unit, when the rotating speed reaches 600r/min or the exhaust gas temperature exceeds 80 ℃ after the unit is started, the water spraying device is automatically opened, and when the unit is loaded with 15% and the exhaust gas temperature is less than 80 ℃, the water spraying device is automatically stopped.
Other components and connection relationships are the same as those in the first, second or third embodiment.
The fifth concrete implementation mode: referring to fig. 1, the present embodiment is described, and a high-pressure main steam adjusting combination valve 18 is provided at the left end of the cylinder 1 according to the present embodiment.
The high-pressure steam inlet of the unit is controlled by a high-pressure main steam adjusting combined valve, is arranged on the head part of the steam turbine and the shaft center line and has a horizontal structure. The new steam from the boiler enters the main steam valve and then enters the high pressure regulating valve, and the outlet of the high pressure regulating valve is connected with the high pressure steam chamber in the front cylinder by welding through the main steam pipe. The valve is connected with the framework into a whole, and the framework is fixed with the foundation. One main steam valve corresponds to one regulating valve.
The low-pressure main steam valve and the regulating valve adopt three-eccentric-center hydraulic butterfly valves arranged below the running layer. Is connected with a steam supplementing port before 16 stages. The steam valve set has a swing support allowing the steam valve set to freely expand in the horizontal direction.
Other components and connections are the same as those of the first, second, third or fourth embodiments.
The sixth specific implementation mode: referring to fig. 1, the first, second, third, fourth, fifth, sixth, seventh, eighth and ninth separator sleeves 9, 10, 11, 12, 13, 14, 16 and 17 are provided on the inner side of the upper wall of the cylinder 1 in the longitudinal direction.
Except for the low-pressure last two-stage partition plate, all the other high, medium and low-pressure static blades and movable blades adopt pre-twisted assembly type structures, and compared with the traditional welding partition plate, the assembly type structure has no welding line, avoids welding deformation, and better ensures through-flow precision.
Other components and connection relationships are the same as those in the first, second, third, fourth or fifth embodiment.
The seventh embodiment: the present embodiment will be described with reference to fig. 1 and 4, and a steam compensating valve 1-1 is provided at a lower portion of a lower half of a cylinder 1 according to the present embodiment.
Other components and connection relationships are the same as those in the first, second, third, fourth, fifth or sixth embodiment.
The working principle is as follows:
the unit is characterized in that new steam from a waste heat boiler enters a main steam regulating valve group positioned at the head of a cylinder through a motor isolating valve, the steam from a regulating valve passes through a main steam pipeline, enters a high-pressure steam chamber cast into a whole with a high-pressure inner cylinder through two paths at the lower part of the cylinder simultaneously, is mixed with 2 nd steam (steam supplement) from the waste heat boiler after working in stages 1 to 16, is discharged into a condenser to be condensed into water after working in stages 17 to 23, is pumped out by a condensate pump, passes through a gland seal heater, a low-pressure heater and a deaerator, and enters the boiler after being pressurized by an electric water feeding pump.
The dead point 21 of the low pressure cylinder is the intersection point of the horizontal pin 22 and the vertical pin 23 of the low pressure cylinder, and the low pressure cylinder expands or contracts towards two sides along the intersection point; the relative dead center of the turbine rotor is the rotor thrust disc 24 face with which the turbine rotor expands or contracts toward the electrical end.
Although the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention,
according to the technical spirit of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments within the spirit and principle of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (7)
1. A novel E-stage combined cycle steam turbine is characterized in that: the novel E-stage combined cycle steam turbine comprises a cylinder (1), a rotor (2), a front bearing box (3), a first thrust support bearing (4), a rear bearing box (5), a second support bearing (6) and a steam exhaust cylinder (7),
the left end of the rotor (2) is sleeved with a thrust supporting bearing (4), and the right end of the rotor (2) is sleeved with a supporting bearing (6);
the thrust supporting bearing (4) is positioned in the front bearing box (3), the supporting bearing (6) is positioned in the rear bearing box (5),
the cylinder (1) is sleeved on the rotor (2), and the front end and the rear end of the cylinder (1) are respectively supported by the front bearing box (3) and the rear bearing box (5); the steam exhaust end on the right side of the cylinder (1) is connected with a steam exhaust cylinder (7).
2. The new type of the cascade-connected cycle steam turbine according to claim 1, wherein: the novel E-stage combined cycle steam turbine further comprises a centering beam (8), and the lower half of the cylinder (1) is connected with the front bearing box (3) through the centering beam (8).
3. The new type of the cascade-connected cycle steam turbine according to claim 2, wherein: the upper part of the exhaust cylinder (7) is provided with a steam valve (7-1).
4. The new type of the cascade-connected cycle steam turbine according to claim 2, wherein: the novel E-stage combined cycle steam turbine further comprises a turning gear (8), wherein the turning gear (8) is installed at the steam exhaust end of the cylinder (1) and is located on an upper cover of the rear bearing box (5).
5. The new type of the cascade-connected cycle steam turbine according to claim 2, wherein: the left end of the cylinder (1) is provided with a high-pressure main steam adjusting combined valve (18).
6. The new type of the cascade-connected cycle steam turbine according to claim 2, wherein: the inner side of the upper wall of the cylinder (1) is provided with a first separation plate sleeve (9), a second separation plate sleeve (10), a third separation plate sleeve (11), a fourth separation plate sleeve (12), a fifth separation plate sleeve (13), a sixth separation plate sleeve (14), a seventh separation plate sleeve (15), an eighth separation plate sleeve (16) and a ninth separation plate sleeve (17) along the length direction of the inner side of the upper wall.
7. The new type of the cascade-connected cycle steam turbine according to claim 2, wherein: the lower part of the lower half of the cylinder (1) is provided with a steam supplementing valve (1-1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011595118.5A CN112627908A (en) | 2020-12-28 | 2020-12-28 | Novel E-stage combined cycle steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011595118.5A CN112627908A (en) | 2020-12-28 | 2020-12-28 | Novel E-stage combined cycle steam turbine |
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| CN112627908A true CN112627908A (en) | 2021-04-09 |
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| CN202011595118.5A Pending CN112627908A (en) | 2020-12-28 | 2020-12-28 | Novel E-stage combined cycle steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114087040A (en) * | 2021-10-21 | 2022-02-25 | 中国长江动力集团有限公司 | High-temperature high-pressure high-rotation-speed condensing steam turbine |
-
2020
- 2020-12-28 CN CN202011595118.5A patent/CN112627908A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114087040A (en) * | 2021-10-21 | 2022-02-25 | 中国长江动力集团有限公司 | High-temperature high-pressure high-rotation-speed condensing steam turbine |
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