CN214145588U - Novel 40 MW-grade reaction type extraction condensing combined cycle steam turbine - Google Patents
Novel 40 MW-grade reaction type extraction condensing combined cycle steam turbine Download PDFInfo
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- CN214145588U CN214145588U CN202023068705.7U CN202023068705U CN214145588U CN 214145588 U CN214145588 U CN 214145588U CN 202023068705 U CN202023068705 U CN 202023068705U CN 214145588 U CN214145588 U CN 214145588U
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Abstract
A novel 40MW grade reaction type extraction condensing combined cycle steam turbine belongs to the field of steam turbine modification, and the utility model aims to solve the problems of early molding, impulse type unit, low stage efficiency, few stage numbers, unreasonable structural design, low unit cycle efficiency, low cylinder efficiency, poor overall performance and poor market competitiveness of the existing 40MW grade combined cycle steam turbine, the novel 40MW grade reaction type extraction condensing combined cycle steam turbine comprises a 40MW combined turbine main body, a main steam adjusting combined valve, a communication pipe, a steam extraction butterfly valve and a three balanced drum thrust system, wherein the communication pipe is connected with a high pressure cylinder and a medium and low pressure cylinder, the steam extraction butterfly valve is arranged at one end of the communication pipe close to the medium and low pressure cylinder, the main steam adjusting combined valve is arranged outside the cylinder body of the steam turbine main body, and the three balanced drum thrust system is arranged in the high pressure cylinder of the steam turbine main body, the device is used for ensuring that the integral thrust of the unit is always within the range which can be borne by the thrust bearing when the re-extraction amount is changed.
Description
Technical Field
The utility model belongs to the steam turbine field of reforming transform, concretely relates to novel 40MW grade reaction type is taken out and is congealed formula combined cycle steam turbine.
Background
The reaction steam turbine is a steam turbine in which steam expands not only in the nozzle but also in the rotor blade, and the rotor blade of the reaction steam turbine receives not only an acting force generated by the impact of the steam flow but also an acting force generated by the expansion and acceleration of the steam in the rotor blade;
the extraction condensing turbine is a turbine which extracts a part of steam from a turbine intermediate stage to supply to a user, namely, the turbine which generates electricity and also supplies heat. The steam extraction type can be designed into a primary regulation steam extraction type or a secondary regulation steam extraction type according to the needs of users;
in order to better realize the work of the steam turbine, the combined cycle steam turbine is researched and developed by combining the advantages and the working characteristics of the reaction steam turbine and the extraction condensing steam turbine;
the existing 40MW grade combined cycle steam turbine is early in forming, is an impulse type unit, and has low grade efficiency, few grade, unreasonable structural design, low unit cycle efficiency, low cylinder efficiency, poor overall performance and poor market competitiveness.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems that the existing 40MW grade combined cycle steam turbine is early molded and is an impulse type unit, the stage efficiency is low, the stage number is small, in addition, the structural design is unreasonable, the unit cycle efficiency is low, the cylinder efficiency is low, the overall performance is poor, and the market competitiveness is poor, thereby providing a novel 40MW grade reaction type extraction condensing combined cycle steam turbine;
a novel 40MW grade reaction type extraction condensing combined cycle steam turbine comprises a 40MW combined steam turbine main body, a main steam adjusting combined valve, a communicating pipe, a steam extraction butterfly valve and a three balance drum thrust system, wherein the communicating pipe is arranged outside a cylinder body of the steam turbine main body, the steam inlet end of the communicating pipe is communicated with a high-pressure cylinder in the steam turbine main body, the steam outlet end of the communicating pipe is communicated with a medium-low pressure cylinder in the steam turbine main body, one end of the communicating pipe close to the medium-low pressure cylinder is provided with a steam extraction butterfly valve, the main steam adjusting joint valve is arranged outside the steam turbine main body, the steam outlet end of the main steam adjusting combination valve is communicated with a high-pressure cylinder in the steam turbine main body, the steam inlet end of the main steam adjusting combination valve is communicated with a main steam interface, a three-balance-drum thrust system is further arranged in the high-pressure cylinder in the steam turbine main body, and the three-balance-drum thrust system is used for ensuring that the integral thrust of the unit is always within the range which can be borne by the thrust bearing when the re-extraction amount is changed;
furthermore, an extraction regulating valve, a check valve and an extraction safety valve are sequentially arranged on the communicating pipe from the steam inlet end to the steam outlet end;
further, an air outlet hole is processed at the front side of the steam extraction butterfly valve;
furthermore, the three balance drum thrust system comprises a high-pressure balance drum, a medium-pressure balance drum and a low-pressure balance drum, wherein the high-pressure balance drum is arranged at one end, close to a turbine rotor thrust disc, of a high-pressure cylinder in the turbine main body, the low-pressure balance drum is arranged at the interface of the high-pressure cylinder and the medium-low pressure cylinder, the medium-pressure balance drum is arranged between the high-pressure balance drum and the low-pressure balance drum, and the medium-pressure balance drum is arranged close to the low-pressure balance drum;
furthermore, one end of the high-pressure cylinder, which is far away from the medium-low pressure cylinder, is arranged on the front bearing box, the high-pressure cylinder is connected with the front bearing box in a sliding manner, and the front bearing box is fixedly connected with the ground through the floor stand;
furthermore, one end of the medium and low pressure cylinder, which is far away from the high pressure cylinder, is arranged on the rear bearing box, the medium and low pressure cylinder is fixedly connected with the rear bearing box, and the rear bearing box is fixedly connected with the ground through the floor stand;
furthermore, all static blades, moving blades and rotor shafts on the impeller in the steam turbine main body are of pre-twisted assembly type structures;
further, the high-pressure cylinder and the medium-low pressure cylinder are both of a double-layer cylinder structure.
Compared with the prior art, the utility model following beneficial effect has:
the utility model provides a novel 40MW grade reaction type extraction condensing combined cycle steam turbine, the baffling position adopts communicating pipe arrangement, steam enters middle and low pressure part through communicating pipe after passing through high pressure part sub-group acting, a butterfly valve is added on the communicating pipe, the front of the butterfly valve is punched for supplying steam, steam supply pressure is controlled by adjusting the opening degree of the butterfly valve, steam supply is ensured, the steam entering the turbine has excellent thermodynamic property and through-flow efficiency in the process of entering a low pressure cylinder from a high pressure cylinder by arranging the communicating pipe while the steam supply is ensured, the reliability of the turbine during working is improved, the turbine start and stop are more flexible by designing the main steam adjusting combined valve, the operation is safe and reliable, the improvement is completed based on the existing forming turbine, the whole layout of the turbine can not be changed, the overhaul and maintenance of the turbine are very simple and convenient, can effectively improve the market competitiveness.
Drawings
FIG. 1 is a schematic longitudinal sectional view of the present invention;
FIG. 2 is a front view of the external arrangement of the present invention;
FIG. 3 is a top view of the configuration layout of the present invention;
FIG. 4 is a left side view of the external form layout of the present invention;
FIG. 5 is a diagram of a sliding pin system of the unit of the present invention;
the system comprises a main steam adjusting combination valve 1, a communicating pipe 2, a steam extraction butterfly valve 3, a three-balance-drum thrust system 4, a high-pressure cylinder 5, a middle-low pressure cylinder 6, a front bearing box 7, a rear bearing box 8, an absolute dead point of a unit a, a relative expansion dead point of a turbine rotor b, an expansion direction of a high-pressure cylinder unit c and an expansion direction of a turbine rotor d.
Detailed Description
The first embodiment is as follows: the embodiment is explained by referring to fig. 1 to 5, the embodiment provides a novel 40MW grade reaction type extraction condensing combined cycle steam turbine, the steam turbine comprises a 40MW combined steam turbine main body, and further comprises a main steam adjusting combined valve 1, a communicating pipe 2, a steam extraction butterfly valve 3 and a three balanced drum thrust system 4, the communicating pipe 2 is arranged outside the steam turbine main body, the steam inlet end of the communicating pipe 2 is communicated with a high pressure cylinder 5 in the steam turbine main body, the steam outlet end of the communicating pipe 2 is communicated with a middle or low pressure cylinder 6 in the steam turbine main body, one end of the communicating pipe 2 close to the middle or low pressure cylinder 6 is provided with the steam extraction butterfly valve 3, the main steam adjusting combined valve 1 is arranged outside the steam turbine main body, the steam outlet end of the main steam adjusting combined valve 1 is communicated with the high pressure cylinder 5 in the steam turbine main body, the steam inlet end of the main steam adjusting combined valve 1 is communicated with a main steam interface, and a three-balance-drum thrust system 4 is also arranged in a high-pressure cylinder 5 in the steam turbine main body, and the three-balance-drum thrust system 4 is used for ensuring that the integral thrust of the turbine set is always within the bearable range of the thrust bearing when the re-extraction amount is changed.
The embodiment provides a novel 40MW grade reverse pumping condensing combined cycle steam turbine, the deflection position of the turbine is arranged by a communicating pipe, steam is acted by a high pressure part sub-group and then enters a middle and low pressure part through the communicating pipe to do work, a butterfly valve is additionally arranged on the communicating pipe, holes are arranged in front of the butterfly valve to supply steam to the outside, the steam supply pressure is controlled by adjusting the opening degree of the butterfly valve to ensure the steam supply amount, the steam entering the turbine has excellent thermodynamic performance and through-flow efficiency in the process of entering a low pressure cylinder from a high pressure cylinder by the communicating pipe while ensuring the steam supply amount, the reliability of the turbine in work is improved, the turbine is more flexible to start and stop and safe and reliable to operate by the design of a main steam adjusting combined valve, the improvement is completed based on the existing forming turbine, the whole layout of the turbine cannot be changed, and the overhaul and maintenance of the turbine are very simple and convenient, can effectively improve the market competitiveness.
The second embodiment is as follows: the present embodiment will be described with reference to fig. 1 to 5, and the present embodiment further defines the communicating pipe 2 according to the first embodiment, and in the present embodiment, an extraction regulating valve, a check valve, and an extraction safety valve are sequentially provided on the communicating pipe 2 from a steam inlet end to a steam outlet end. Other components and connection modes are the same as those of the first embodiment.
So set up, be convenient for adjust unit adjustment steam extraction volume, guarantee steam extraction load change or get rid of load opportunity group security.
The third concrete implementation mode: the present embodiment will be described with reference to fig. 1 to 5, and the present embodiment further defines the steam extraction butterfly valve 3 according to the second embodiment, and in the present embodiment, a gas outlet hole is formed in the front side of the steam extraction butterfly valve 3. The other components and the connection mode are the same as those of the second embodiment.
So set up, add on communicating pipe 2 and establish steam extraction butterfly valve 3, punch before the steam extraction butterfly valve 3 and supply vapour to the outside.
The fourth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 5, and the present embodiment is further limited to the three balance drum thrust system 4 according to the third embodiment, in the present embodiment, the three balance drum thrust system 4 includes a high pressure balance drum, a middle pressure balance drum and a low pressure balance drum, the high pressure balance drum is disposed at one end of the high pressure cylinder 5 near the turbine rotor thrust disk in the turbine main body, the low pressure balance drum is disposed at the interface between the high pressure cylinder 5 and the middle and low pressure cylinder 6, the middle pressure balance drum is disposed between the high pressure balance drum and the low pressure balance drum, and the middle pressure balance drum is disposed near the low pressure balance drum. Other components and connection modes are the same as those of the third embodiment.
In the embodiment, the three balance drum thrust balance system 4 is adopted, the high-pressure balance drum balances the thrust generated by the high-pressure part grading group, the medium-pressure balance drum and the low-pressure balance drum balance the thrust generated by the medium-low pressure part grading group, the respective balance of the thrusts of the high-pressure cylinder and the medium-low pressure cylinder is ensured, and the whole thrust of the group is ensured to be always within the range which can be borne by the thrust bearing when the steam extraction amount is changed.
The fifth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 5, and the present embodiment further defines the high pressure cylinder 5 according to the fourth embodiment, in the present embodiment, one end of the high pressure cylinder 5 away from the medium/low pressure cylinder 6 is disposed on the front bearing box 7, the high pressure cylinder 5 is slidably connected to the front bearing box 7, and the front bearing box 7 is fixedly connected to the ground through the floor stand. The other components and the connection mode are the same as those of the fourth embodiment.
This embodiment front bearing case 7 adopts the structure of falling to the ground to support on the bed frame, and high-pressure jar 5 transfers the end to support on front bearing case 7 through lower cat claw, cat claw and front bearing case sliding fit.
The sixth specific implementation mode: the present embodiment is described with reference to fig. 1 to 5, and the present embodiment further defines the intermediate and low pressure cylinder 6 according to the fifth embodiment, in the present embodiment, one end of the intermediate and low pressure cylinder 6 away from the high pressure cylinder 5 is disposed on the rear bearing box 8, the intermediate and low pressure cylinder 6 is fixedly connected to the rear bearing box 8, and the rear bearing box 8 is fixedly connected to the ground through the floor stand. The other components and the connection mode are the same as the fifth embodiment mode.
The seventh embodiment: the present embodiment will be described with reference to fig. 1 to 5, and the present embodiment further defines the steam turbine main body according to a sixth embodiment, and in the present embodiment, all of the static and moving blades of the impeller and the rotor shaft in the steam turbine main body are of a pre-twisted assembly type structure. Other components and connection modes are the same as those of the sixth embodiment.
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 the assembly type structures have no welding seams, so that welding deformation is avoided, and the through-flow precision is better ensured.
The specific implementation mode is eight: the present embodiment will be described with reference to fig. 1 to 5, and the present embodiment further defines the high-pressure cylinder 5 and the intermediate-low pressure cylinder 6 according to the seventh embodiment, and in the present embodiment, both the high-pressure cylinder 5 and the intermediate-low pressure cylinder 6 have a double-cylinder structure. The other components and the connection mode are the same as those of the seventh embodiment.
The double-layer cylinder structure is adopted in the embodiment, 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 inner cylinder and the 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.
Principle of operation
The utility model discloses main vapour regulation combination valve, communicating pipe, extraction butterfly valve and three balanced drum thrust systems have mainly been increased on current combination formula steam turbine unit's basis. The improved unit adopts single-cylinder single-exhaust steam baffling arrangement, adopts a double-layer cylinder structure, and the baffling position adopts communicating pipe arrangement, and steam enters the low-pressure part grading group through the communicating pipe after passing through the high-pressure part grading group for acting, and a butterfly valve is additionally arranged on the communicating pipe, and is punched before the butterfly valve for supplying steam to the outside. The unit adopts a design without a steam guide pipe, a steam inlet valve is directly connected with a cylinder, main steam enters the cylinder after entering a main steam adjusting joint valve, and flows through a high-pressure part and then flows out from a steam exhaust pipeline at a baffling position; the steam enters the medium-low pressure part through flow through a communicating pipe, flows through the medium-low pressure part through flow and then enters a condenser through a steam outlet at the lower part of the steam exhaust cylinder;
the utility model discloses the absolute dead point design of well unit is in low pressure steam exhaust cylinder department, for the absolute dead point of the inflation of whole unit. The relative expansion dead point of the turbine rotor is designed at the thrust bearing of the front bearing box. During operation, the cylinder expands towards the adjusting end, the cylinder pushes the front bearing box to slide through the centering beam, and the turbine rotor expands towards the two ends by taking the thrust bearing as a center.
Claims (8)
1. The utility model provides a novel 40MW grade reaction formula of taking out condensing combined cycle steam turbine, the steam turbine includes 40MW combined turbine main part, its characterized in that: the steam turbine further comprises a main steam adjusting combination valve (1), a communicating pipe (2), a steam extraction butterfly valve (3) and a three-balance drum thrust system (4), wherein the communicating pipe (2) is arranged outside a cylinder body of the steam turbine main body, a steam inlet end of the communicating pipe (2) is communicated with a high-pressure cylinder (5) in the steam turbine main body, a steam outlet end of the communicating pipe (2) is communicated with a medium-low pressure cylinder (6) in the steam turbine main body, one end, close to the medium-low pressure cylinder (6), of the communicating pipe (2) is provided with the steam extraction butterfly valve (3), the main steam adjusting combination valve (1) is arranged outside the cylinder body of the steam turbine main body, a steam outlet end of the main steam adjusting combination valve (1) is communicated with the high-pressure cylinder (5) in the steam turbine main body, a steam inlet end of the main steam adjusting combination valve (1) is communicated with a main steam interface, the three-balance drum thrust system (4) is further arranged in the high-pressure cylinder (5) in the steam turbine main body, the three-balance-drum thrust system (4) is used for ensuring that the integral thrust of the turbine set is always within the range which can be borne by the thrust bearing when the re-extraction amount is changed.
2. A novel 40MW grade reaction condensing combined cycle steam turbine as claimed in claim 1 wherein: and a steam extraction regulating valve, a check valve and a steam extraction safety valve are sequentially arranged on the communicating pipe (2) from the steam inlet end to the steam outlet end.
3. A novel 40MW grade reaction condensing combined cycle steam turbine as claimed in claim 2 wherein: and an air outlet hole is processed at the front side of the steam extraction butterfly valve (3).
4. A novel 40MW grade reaction condensing combined cycle steam turbine as claimed in claim 3 wherein: the three-balance-drum thrust system (4) comprises a high-pressure balance drum, a medium-pressure balance drum and a low-pressure balance drum, wherein the high-pressure balance drum is arranged at one end, close to a turbine rotor thrust disc, of a high-pressure cylinder (5) in a turbine main body, the low-pressure balance drum is arranged at a connector of the high-pressure cylinder (5) and a medium-low pressure cylinder (6), the medium-pressure balance drum is arranged between the high-pressure balance drum and the low-pressure balance drum, and the medium-pressure balance drum is arranged close to the low-pressure balance drum.
5. The new 40MW class reaction condensing combined cycle turbine according to claim 4, wherein: one end, far away from the medium and low pressure cylinder (6), of the high pressure cylinder (5) is arranged on the front bearing box (7), the high pressure cylinder (5) is connected with the front bearing box (7) in a sliding mode, and the front bearing box (7) is fixedly connected with the ground through the floor stand.
6. The new 40MW class reaction condensing combined cycle turbine according to claim 4, wherein: one end, far away from the high-pressure cylinder (5), of the medium-low pressure cylinder (6) is arranged on the rear bearing box (8), the medium-low pressure cylinder (6) is fixedly connected with the rear bearing box (8), and the rear bearing box (8) is fixedly connected with the ground through a floor stand.
7. The new 40MW class reaction condensing combined cycle turbine according to claim 6, wherein: all static blades, moving blades and rotor shafts on the impellers in the steam turbine main body are of pre-twisted assembly type structures.
8. A novel 40MW grade reaction condensing combined cycle steam turbine as claimed in claim 7 wherein: the high pressure cylinder (5) and the medium and low pressure cylinder (6) are both of a double-layer cylinder structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023068705.7U CN214145588U (en) | 2020-12-18 | 2020-12-18 | Novel 40 MW-grade reaction type extraction condensing combined cycle steam turbine |
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| CN202023068705.7U CN214145588U (en) | 2020-12-18 | 2020-12-18 | Novel 40 MW-grade reaction type extraction condensing combined cycle steam turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523817A (en) * | 2020-12-18 | 2021-03-19 | 哈尔滨汽轮机厂有限责任公司 | Novel 40 MW-grade reaction type extraction condensing combined cycle steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523817A (en) * | 2020-12-18 | 2021-03-19 | 哈尔滨汽轮机厂有限责任公司 | Novel 40 MW-grade reaction type extraction condensing combined cycle steam turbine |
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