CN214145589U - Novel 80MW grade reaction condensing type combined cycle steam turbine - Google Patents
Novel 80MW grade reaction condensing type combined cycle steam turbine Download PDFInfo
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- CN214145589U CN214145589U CN202023326147.XU CN202023326147U CN214145589U CN 214145589 U CN214145589 U CN 214145589U CN 202023326147 U CN202023326147 U CN 202023326147U CN 214145589 U CN214145589 U CN 214145589U
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Abstract
The utility model provides a novel 80MW grade reaction formula condensing steam formula combined cycle steam turbine, includes that preceding bearing box, well bearing box, rear bearing box, high-pressure cylinder, well low pressure cylinder, console mode low pressure exhaust cylinder, middling pressure reheat regulation joint valve, high pressure main vapour adjust joint valve, moving blade and well medium pressure admission gear, middling pressure reheat regulation joint valve fixed mounting is on well low pressure cylinder, high pressure main vapour adjusts joint valve fixed mounting on high-pressure cylinder, high pressure main vapour adjusts joint valve and high pressure cylinder in 1 number spiral case intercommunication, high pressure cylinder and well low pressure cylinder inside bilateral symmetry fixed mounting have a plurality of moving blades, except the last two-stage baffle of low pressure, all the other moving blades on high pressure cylinder and the well low pressure cylinder all set into type of falling T blade root structure, well medium pressure admission gear is installed on the well low pressure cylinder that is close to well bearing box. The invention adopts the multi-stage small enthalpy drop reaction design for the through flow of the unit, thereby fundamentally improving the flow efficiency.
Description
Technical Field
The utility model relates to a novel 80MW grade reaction condensing combined cycle steam turbine.
Background
The existing steam turbine of the same grade has the disadvantages of early molding design, low grade efficiency, few grade, unreasonable structural design, low cycle efficiency of the turbine, low cylinder efficiency, poor overall performance and poor market competitiveness, and is an impulse type turbine set.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome the problem that unit circulation efficiency is low, jar inefficiency, provide a novel 80MW grade reaction condensing steam formula combined cycle steam turbine.
The technical scheme of the utility model is that:
a novel 80MW grade reaction condensing combined cycle steam turbine comprises a front bearing box, a middle bearing box, a rear bearing box, a high pressure cylinder, a middle and low pressure pressing cylinder, a floor type low pressure exhaust cylinder, a medium pressure reheating adjusting combined valve, a high pressure main steam adjusting combined valve, a moving blade and a medium pressure steam inlet device,
the front bearing box, the middle bearing box and the rear bearing box are fixedly arranged on the foundation,
the high-pressure end of the high-pressure cylinder is connected with the front bearing box in a sliding manner, the low-pressure end of the high-pressure cylinder is fixedly connected with the middle bearing box, the high-pressure end of the middle-low pressure cylinder is fixedly connected with the middle bearing box, the low-pressure end of the middle-low pressure cylinder is fixedly connected with the floor type low-pressure exhaust cylinder, the medium-pressure reheating adjusting combination valve is fixedly arranged on the middle-low pressure cylinder, the high-pressure main steam adjusting combination valve is fixedly arranged on the high-pressure cylinder, and the high-pressure main steam adjusting combination valve is communicated with a No. 1 volute in the high-pressure cylinder,
the high-pressure cylinder and the middle-low pressure combination cylinder are symmetrically and fixedly provided with a plurality of moving blades at two sides, the moving blades on the high-pressure cylinder and the middle-low pressure combination cylinder except the low-pressure last two-stage partition plate are all arranged into an inverted T-shaped blade root structure, and the middle-pressure steam inlet device is arranged on the middle-low pressure combination cylinder close to the middle bearing box.
Compared with the prior art, the utility model has the following effect:
the unit is designed to be a high-pressure cylinder and a medium-low pressure cylinder, the length of a shaft system is shortened, the length of the unit is shortened to the maximum extent on the premise that the unit is high in circulation efficiency and high in safety, the space is saved, and the construction cost is reduced.
Secondly, the through flow of the unit adopts a multi-stage small enthalpy drop reaction type design, so that the flow efficiency is fundamentally improved;
thirdly, a rear loading type novel blade profile is adopted, the blade profile attack angle is wide in application range, the variable load operation characteristic is good, the rated load efficiency of the unit is improved, and the economical efficiency of the unit in variable load operation is considered;
the unit adopts full-circle steam admission, and a valve is directly connected with a cylinder, so that the steam admission loss is reduced to the maximum extent, more enthalpy drops are prevented from falling on impulse type adjusting levels with low efficiency, and the enthalpy drops are distributed on small enthalpy drop reaction pressure levels, so that higher level efficiency can be obtained;
and fifthly, 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, so that the welding deformation is avoided, and the through-flow precision is better ensured.
Drawings
FIG. 1 is a schematic longitudinal sectional structure of the present invention;
FIG. 2 is a schematic diagram of an intermediate pressure reheat trim combination valve and a high pressure main steam trim combination valve arrangement;
FIG. 3 is a schematic view of a high pressure cylinder;
fig. 4 is a schematic layout of a steam turbine.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 4, and the novel 80MW grade reaction condensing combined cycle steam turbine of the embodiment comprises a front bearing box 1, a middle bearing box 2, a rear bearing box 3, a high pressure cylinder 4, a middle and low pressure cylinder 5, a floor type low pressure exhaust cylinder 6, a medium pressure reheating regulating combined valve 7, a high pressure main steam regulating combined valve 8, a moving blade 52 and a medium pressure steam inlet device 53,
the front bearing box 1, the middle bearing box 2 and the rear bearing box 3 are fixedly arranged on the foundation,
the high-pressure end of the high-pressure cylinder 4 is connected with the front bearing box 1 in a sliding manner, the low-pressure end of the high-pressure cylinder 4 is fixedly connected with the middle bearing box 2, the high-pressure end of the middle-low pressure combination cylinder 5 is fixedly connected with the middle bearing box 2, the low-pressure end of the middle-low pressure combination cylinder 5 is fixedly connected with the floor type low-pressure exhaust cylinder 6, the medium-pressure reheating adjusting combination valve 7 is fixedly arranged on the middle-low pressure combination cylinder 5, the high-pressure main steam adjusting combination valve 8 is fixedly arranged on the high-pressure cylinder 4, the high-pressure main steam adjusting combination valve 8 is communicated with a No. 1 volute 42 in the high-pressure cylinder 4,
a plurality of moving blades 52 are symmetrically and fixedly installed on two sides of the interior of the high-pressure cylinder 4 and the middle-low pressure combination cylinder 5, except for the low-pressure last two-stage partition plate, the moving blades 52 on the other high-pressure cylinder 4 and the middle-low pressure combination cylinder 5 are all arranged in an inverted T-shaped blade root structure, and the middle-pressure steam inlet device 53 is installed on the middle-low pressure combination cylinder 5 close to the middle bearing box 2.
Compared with the traditional valve, the medium-pressure reheating regulation combined valve 7 and the high-pressure main steam regulation combined valve 8 are arranged, the valve cavity diffusion molded line is optimized, the valve limiting form is adjusted, the back of a valve disc is in full-circumference contact with a valve rod sleeve when the valve is fully opened, self sealing is formed, steam leakage of a valve rod is avoided, and the total pressure loss can be reduced by 2% when the valve is fully opened.
The high-pressure cylinder 4 and the medium-low pressure cylinder 5 are designed in a single-cylinder steam exhaust mode, high-pressure through flow is arranged in a reverse direction, medium-low pressure is arranged in a forward direction, and the through flow of the whole machine is arranged in a forward and reverse combined mode, so that the thrust of the unit is reduced favorably compared with the unidirectional arrangement.
The second embodiment is as follows: referring to fig. 1 to 4, the embodiment is described, one end of a high-pressure rotor 41 in the high-pressure cylinder 4 of the embodiment is sleeved with a front bearing 11 in a front bearing box 1, one end of the high-pressure rotor 41 is rotatably connected with the front bearing 11, the other end of the high-pressure rotor 41 is sleeved with a middle bearing 21 in a middle bearing box 2, and the other end of the high-pressure rotor 41 is rotatably connected with the middle bearing 21; the high-pressure end of the middle and low pressure rotor 51 in the middle and low pressure cylinder 5 is connected with the other end of the high pressure rotor 41; the low pressure end of the middle and low pressure rotor 51 is rotatably connected with the rear bearing 31 in the rear bearing housing 3.
The third concrete implementation mode: the embodiment is described with reference to fig. 1 to 4, the medium-pressure reheat regulation combined valve 7 of the embodiment includes a reheat steam inlet 71, a regulation valve vertical actuator 72, a connecting short pipe 73 and valve supports 74, two valve supports 74 are installed above the regulation valve vertical actuator 72, the connecting short pipe 73 is installed below the regulation valve vertical actuator 72, the connecting short pipe 73 is communicated with the medium-low pressure cylinder 5, and the reheat steam inlet 71 is installed on one side of the regulation valve vertical actuator 72.
The fourth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 4, and the high-pressure cylinder 4 and the middle/low-pressure cylinder 5 in the present embodiment are connected by a centering beam.
The fifth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 4, in which the high pressure cylinder 4 of the present embodiment has a double-cylinder structure and a high-narrow flange structure, and the inner cylinder of the high pressure cylinder has a 360-degree tangential volute steam intake mode.
The double-layer cylinder structure is adopted, the high-temperature working environment characteristics of the unit are adapted, the cylinder body is good in strength, good in rigidity and small in thermal stress, the high-pressure inner cylinder and the high-pressure outer cylinder are both cast, and the high-narrow flange structure is adopted, so that the requirement of quick start of the unit is met. The high-pressure inner cylinder adopts a 360-degree tangential volute steam inlet mode, and steam inlet is matched with the transversely-arranged stationary blades to ensure steam inlet efficiency.
The sixth specific implementation mode: the present embodiment will be described with reference to fig. 1 to 4, and both the high-pressure rotor 41 and the middle and low-pressure rotors 51 of the present embodiment are monobloc forged rotors. The front section and the rear section have different mechanical properties, which not only meets the high-temperature strength requirement of the high-temperature section, but also meets the performances of the high strength and the low brittle transition temperature value of the low-temperature section.
The seventh embodiment: the present embodiment will be described with reference to fig. 1 to 4, in which the vane and the blade of the high pressure cylinder 4 and the medium/low pressure cylinder 5 of the present embodiment are assembled.
The specific implementation mode is eight: the embodiment is described with reference to fig. 1 to 4, and the novel 80MW grade reaction condensing combined cycle steam turbine of the embodiment adopts a non-guide steam pipe design, a steam inlet valve is directly connected with a cylinder, main steam enters a high-pressure main steam adjusting combined valve 8, then enters a high-pressure cylinder 4, flows through a high-pressure through-flow and then flows out from a steam exhaust pipeline at the lower part of a high-pressure outer cylinder; the steam reheated by the boiler enters the main reheating steam adjusting combined valve and then enters the intermediate pressure cylinder, flows through the intermediate and low pressure through-flow and then enters the condenser through the steam outlet at the lower part of the steam exhaust cylinder.
The specific implementation method nine: the embodiment is described with reference to fig. 1 to 4, and the novel 80MW grade reaction condensing combined cycle steam turbine of the embodiment adopts a multi-stage small enthalpy drop reaction design, thereby fundamentally improving the flow efficiency. The movable partition plate has small thickness, can be arranged in multiple stages, has large coefficient of heat, and improves the efficiency of the through-flow part by increasing the coefficient of heat; meanwhile, the root diameter (top diameter) of the blade is greatly reduced while the number of stages is increased, the steam leakage area of the root part of the static blade and the top part of the movable blade is reduced, and the reaction stage has no steam leakage of a balance hole, so that the leakage loss is small, and the unit efficiency can be improved.
The detailed implementation mode is ten: the embodiment is described with reference to fig. 1 to 4, and the novel 80MW grade reaction condensing combined cycle steam turbine of the embodiment adopts a rear loading type novel blade profile, has a wide application range of the attack angle of the blade profile and good variable load operation characteristics, improves the rated load efficiency of the unit, and simultaneously considers the economy during variable load operation.
The concrete implementation mode eleven: the embodiment is described with reference to fig. 1 to 4, and the inner cylinder of the high-pressure cylinder 4 in the novel 80MW grade reaction condensing combined cycle steam turbine of the embodiment is sealed by a red lantern ring, so that the traditional split flange bolt sealing type is replaced, and better cylinder sealing performance is obtained.
The working principle is as follows:
the invention relates to a steam turbine applied to gas-steam combined cycle, which realizes the conversion of heat energy and mechanical energy by enabling steam with certain pressure and temperature to flow through moving blades on a steam turbine rotor at high speed to do work under the action of the pressure difference of inlet steam and outlet steam, and driving the steam turbine rotor to uniformly rotate at certain speed by the moving blades. In the invention, multiple innovative technologies such as high-efficiency multi-stage small enthalpy drop reaction type blade profiles, low-pressure loss main steam combined regulating valves, streamline tangential volute steam admission, intelligent steam seal design systems with minimum leakage amount, high-efficiency last-stage blades and the like are applied to realize more efficient and safer conversion of heat energy and mechanical energy.
The present invention has been disclosed in the above embodiments, but the present invention is not limited thereto, and any person skilled in the art will not depart from the technical solution of the present invention, and any simple modification, equivalent change and modification made by the technical essence of the present invention to the above embodiments still belong to the technical solution scope of the present invention.
Claims (7)
1. A novel 80MW grade reaction condensing combined cycle steam turbine comprises a front bearing box (1), a middle bearing box (2), a rear bearing box (3), a high pressure cylinder (4), a middle and low pressure cylinder (5), a floor type low pressure exhaust cylinder (6), a middle pressure reheating adjusting combined valve (7), a high pressure main steam adjusting combined valve (8), a moving blade (52) and a middle pressure steam inlet device (53),
the front bearing box (1), the middle bearing box (2) and the rear bearing box (3) are fixedly arranged on the foundation,
the method is characterized in that:
the high-pressure end of the high-pressure cylinder (4) is connected with the front bearing box (1) in a sliding mode, the low-pressure end of the high-pressure cylinder (4) is fixedly connected with the middle bearing box (2), the high-pressure end of the medium-low pressure cylinder (5) is fixedly connected with the middle bearing box (2), the low-pressure end of the medium-low pressure cylinder (5) is fixedly connected with the floor type low-pressure exhaust cylinder (6), the medium-pressure reheating adjusting joint valve (7) is fixedly arranged on the medium-low pressure cylinder (5), the high-pressure main steam adjusting joint valve (8) is fixedly arranged on the high-pressure cylinder (4), and the high-pressure main steam adjusting joint valve (8) is communicated with a No. 1 volute (42) in the high-pressure cylinder (4),
the movable blades (52) are symmetrically and fixedly installed on two sides of the interior of the high-pressure cylinder (4) and the middle-low pressure cylinder (5), except for two-stage partition plates at the end of low pressure, the movable blades (52) on the other high-pressure cylinder (4) and the middle-low pressure cylinder (5) are all arranged into an inverted T-shaped blade root structure, and the middle-pressure steam inlet device (53) is installed on the middle-low pressure cylinder (5) close to the middle bearing box (2).
2. The novel 80MW grade reaction condensing combined cycle steam turbine according to claim 1, wherein: one end of a high-pressure rotor (41) in the high-pressure cylinder (4) is sleeved with a front bearing (11) in the front bearing box (1), one end of the high-pressure rotor (41) is rotatably connected with the front bearing (11), the other end of the high-pressure rotor (41) is sleeved with a middle bearing (21) in the middle bearing box (2), and the other end of the high-pressure rotor (41) is rotatably connected with the middle bearing (21); the high-pressure end of a middle and low pressure rotor (51) in the middle and low pressure cylinder (5) is connected with the other end of the high-pressure rotor (41); the low-pressure end of the middle and low-pressure rotor (51) is rotationally connected with a rear bearing (31) in the rear bearing box (3).
3. The novel 80MW grade reaction condensing combined cycle steam turbine according to claim 1, wherein: the medium-pressure reheating regulation combined valve (7) comprises a reheating steam inlet (71), a regulating valve vertical execution mechanism (72), a connecting short pipe (73) and valve supports (74), wherein the two valve supports (74) are installed above the regulating valve vertical execution mechanism (72), the connecting short pipe (73) is installed below the regulating valve vertical execution mechanism (72), the connecting short pipe (73) is communicated with the middle-low pressing cylinder (5), and the reheating steam inlet (71) is arranged on one side of the regulating valve vertical execution mechanism (72).
4. The novel 80MW grade reaction condensing combined cycle steam turbine according to claim 1, wherein: the high-pressure cylinder (4) and the middle-low pressing cylinder (5) are connected through a centering beam.
5. The new 80MW grade reaction condensing combined cycle steam turbine according to claim 4, wherein: the high-pressure cylinder (4) is of a double-layer cylinder structure and a high-narrow flange structure, and an inner cylinder of the high-pressure cylinder adopts a 360-degree tangential volute steam inlet mode.
6. The new 80MW grade reaction condensing combined cycle steam turbine according to claim 2, wherein: the high-pressure rotor (41) and the middle and low-pressure rotors (51) are both integrally forged rotors.
7. The novel 80MW grade reaction condensing combined cycle steam turbine according to claim 1, wherein: the high-pressure cylinder (4) and the static blades and the movable blades on the medium-low pressure cylinder (5) are of an assembled structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023326147.XU CN214145589U (en) | 2020-12-31 | 2020-12-31 | Novel 80MW grade reaction condensing type combined cycle steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023326147.XU CN214145589U (en) | 2020-12-31 | 2020-12-31 | Novel 80MW grade reaction condensing type combined cycle steam turbine |
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| Publication Number | Publication Date |
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| CN214145589U true CN214145589U (en) | 2021-09-07 |
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| CN202023326147.XU Active CN214145589U (en) | 2020-12-31 | 2020-12-31 | Novel 80MW grade reaction condensing type combined cycle steam turbine |
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