CN220667651U - Sectional type steam turbine shaft seal steam supply system - Google Patents
Sectional type steam turbine shaft seal steam supply system Download PDFInfo
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- CN220667651U CN220667651U CN202322493922.8U CN202322493922U CN220667651U CN 220667651 U CN220667651 U CN 220667651U CN 202322493922 U CN202322493922 U CN 202322493922U CN 220667651 U CN220667651 U CN 220667651U
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Abstract
The utility model discloses a sectional steam turbine shaft seal steam supply system which comprises a high-pressure cylinder and a low-pressure cylinder, wherein the high-pressure cylinder and the low-pressure cylinder are provided with a high-pressure shaft seal and a medium-pressure shaft seal, the low-pressure cylinder is provided with a low-pressure shaft seal, the high-pressure shaft seal and the medium-pressure shaft seal are communicated with a high-pressure section of a shaft seal main pipe, the low-pressure shaft seal is communicated with a low-pressure section of the shaft seal main pipe, a first auxiliary steam component and an overflow recovery component are both communicated with the high-pressure section of the shaft seal main pipe, a main pipe shutoff valve is arranged between the high-pressure section and the low-pressure section of the shaft seal main pipe, and a second auxiliary steam component, a steam supply component and a temperature reduction component are all communicated with the low-pressure section of the shaft seal main pipe and are arranged at a position close to the low-pressure shaft seal main pipe. The utility model has the advantages that: the functions of the original system are not changed, and the high-pressure shaft seal section and the low-pressure shaft seal section can be isolated respectively, so that the requirements of the latest specifications are met; realizing independent adjustment of pressure in the shaft seal at the low pressure section; the six sections of steam extraction can be utilized to supply steam to the low-pressure shaft seal, the water spraying and temperature reducing of the shaft seal are not needed, and the steam supply stability of the low-pressure shaft seal is facilitated.
Description
Technical Field
The utility model belongs to the field of thermal power generation, and particularly relates to a segmented steam turbine shaft seal steam supply system.
Background
The conventional shaft seal system adopts a high-pressure shaft seal mother pipe and a low-pressure shaft seal mother pipe to supply steam, leaks steam from a high-pressure cylinder shaft seal to the mother pipe, supplies steam to the low-pressure shaft seal after temperature reduction, and has the following problems:
1. the pressure of the high-pressure shaft seal section and the low-pressure shaft seal section cannot be independently adjusted; in the running process of the unit, the high-pressure section shaft seal is steam leakage, the low-pressure section shaft seal is steam supply, the shaft end is easy to steam out due to the fact that the high-pressure section shaft seal pressure is too high, and the low-pressure section shaft seal pressure is not beneficial to the vacuum of a condenser (steam exhaust device); the pressure requirements of the high-pressure shaft seal section and the low-pressure shaft seal section are contradictory, and in order to improve the vacuum level of a condenser (a steam exhaust device), a power plant often has to improve the pressure operation of a main shaft seal pipe for a long time, so that the shaft end of the high-pressure shaft seal section emits steam and is sucked into a bearing box, and the water content in lubricating oil is increased.
2. The temperature difference between the high-pressure shaft seal section and the low-pressure shaft seal section is large, and the temperature of the shaft seal of the low-pressure section is difficult to adjust stably; the high-pressure section shaft seal has higher steam leakage temperature and large temperature fluctuation along with the change of load; the low-pressure section shaft seal is stable in temperature demand for steam supply, the low-pressure shaft seal water spraying quantity is required to be continuously changed to adapt to the temperature change of a main pipe during the whole operation period of the unit, the water spraying pressure is influenced by a variable-frequency condensing pump, the variable quantity is multiple, the change range is large, the water spraying valve and the nozzle are difficult to adapt, the problem that the low-pressure shaft seal section temperature fluctuation is large, even the low-pressure cylinder shaft vibration is large and the operation safety is seriously influenced is caused in most units.
3. According to the "high-low pressure shaft seals should supply steam respectively" indicated in the latest specification requirements, the conventional system does not meet the specification requirements.
Disclosure of Invention
The utility model aims at: the sectional steam turbine shaft seal steam supply system not only does not change the functions of the original system, but also can isolate the high-pressure shaft seal section and the low-pressure shaft seal section respectively, thereby meeting the requirements of the latest specifications; the shaft seal at the low pressure section realizes independent adjustment of pressure, effectively solves the contradiction between pressure requirements of the high pressure section and the low pressure section, and improves the vacuum of the low pressure cylinder; and can utilize six sections to draw the vapour to supply the vapour to the low pressure shaft seal, need not to carry out the bearing seal spray water temperature reduction, do benefit to the stable vapour that supplies of low pressure shaft seal, the system is simple, and the cost is also lower, promotes flexibility, stability, the security of unit operation, has solved the unsafe, unstable problem of conventional bearing seal steam supply system.
The aim of the utility model is achieved by the following technical scheme:
the utility model provides a sectional type steam turbine bearing seal steam supply system, including high-and-medium pressure jar and low pressure jar, be equipped with high-pressure bearing seal and middling pressure bearing seal on the high-and-medium pressure jar, be equipped with low pressure bearing seal on the low pressure jar, high-pressure bearing seal and middling pressure bearing seal intercommunication bearing seal main pipe's high pressure section, low pressure bearing seal intercommunication bearing seal main pipe's low pressure section, first assistance vapour subassembly and overflow recovery unit all communicate bearing seal main pipe's high pressure section, be equipped with main pipe shut-off valve between bearing seal main pipe's high pressure section and the low pressure section, the low pressure section that the bearing seal main pipe was all linked together to the second assistance vapour subassembly, steam supply subassembly and temperature-reducing unit, temperature-reducing unit establishes the position that is close to low pressure bearing seal on bearing seal main pipe.
Further, the high-medium pressure cylinder is an opposite high-medium pressure cylinder composed of high pressure and medium pressure, the low pressure cylinder is an opposite low pressure cylinder composed of two low pressures, two ends of the high-medium pressure cylinder are respectively provided with a high-pressure shaft seal and a medium-pressure shaft seal, and two ends of the low pressure cylinder are respectively provided with a low-pressure shaft seal.
Furthermore, the high-pressure shaft seal is communicated with the shaft seal main pipe through a high-pressure shaft seal pipeline, the medium-pressure shaft seal is communicated with the shaft seal main pipe through a low-medium-pressure shaft seal pipeline, and the low-pressure shaft seal is communicated with the shaft seal main pipe through a low-pressure shaft seal pipeline.
Further, the first auxiliary steam component comprises auxiliary steam, a first auxiliary steam pipeline and an auxiliary steam regulating valve, the auxiliary steam is communicated with the first auxiliary steam pipeline, the auxiliary steam regulating valve is arranged on the first auxiliary steam pipeline, the first auxiliary steam pipeline is communicated with the high-pressure section of the main shaft seal pipe, and the main shaft seal pipe is provided with a high-pressure section pressure transmitter interlocked with the auxiliary steam regulating valve.
Further, the overflow recovery assembly comprises a final-stage low-pressure adding pipeline, an overflow recovery pipeline and an overflow regulating valve, wherein the final-stage low-pressure adding pipeline is communicated with the overflow recovery pipeline, the overflow recovery pipeline is provided with the overflow regulating valve, the overflow recovery pipeline is communicated with a high-pressure section of a shaft seal main pipe, and the shaft seal main pipe is provided with a high-pressure section pressure transmitter interlocked with the overflow regulating valve.
Further, the shaft seal main pipe is provided with a first check valve connected with the main pipe shutoff valve in parallel, and the shaft seal main pipe is also provided with a safety valve.
Further, the second auxiliary steam component and the steam supply component are communicated with the shaft seal main pipe at a position between the main pipe shut-off valve and the temperature reducing component.
Further, the second auxiliary steam component comprises auxiliary steam, a second auxiliary steam pipeline, an auxiliary steam shutoff valve, a combining pipeline and a low-pressure section regulating valve, wherein the auxiliary steam is communicated with the second auxiliary steam pipeline, the second auxiliary steam pipeline is provided with the auxiliary steam shutoff valve, the second auxiliary steam pipeline is communicated with the combining pipeline, the combining pipeline is provided with the low-pressure section regulating valve, the combining pipeline is communicated with the low-pressure section of the main shaft seal pipe, and the main shaft seal pipe is provided with a low-pressure section pressure transmitter interlocked with the low-pressure section regulating valve.
Further, the steam supply assembly comprises a steam extraction pipeline, a second check valve, a steam extraction shutoff valve, a merging pipeline and a low-pressure section regulating valve, the steam extraction pipeline is communicated with the steam extraction pipeline, the steam extraction pipeline is provided with the second check valve and the steam extraction shutoff valve, the steam extraction pipeline is communicated with the merging pipeline, the merging pipeline is provided with the low-pressure section regulating valve, the merging pipeline is communicated with the low-pressure section of the main shaft seal pipe, and the main shaft seal pipe is provided with a low-pressure section pressure transmitter interlocked with the low-pressure section regulating valve.
Further, the temperature reducing assembly comprises temperature reducing water, a temperature reducing pipeline, a temperature reducing water regulating valve and a temperature reducing device, wherein the temperature reducing water is communicated with the temperature reducing pipeline, the temperature reducing pipeline is provided with the temperature reducing water regulating valve, the temperature reducing pipeline is communicated with the temperature reducing device, the temperature reducing device is arranged on a shaft seal main pipe, and a low-pressure section thermocouple interlocked with the temperature reducing water regulating valve is arranged on the shaft seal main pipe.
The utility model has the beneficial effects that:
1. the system has the capability of independently supplying steam to the high-pressure section and the low-pressure section while maintaining the function of the traditional self-sealing system, and can switch modes in a non-stop state.
2. The pressure requirement contradiction of the shaft seal of the high-pressure section and the low-pressure section is solved, different pressure matching is realized in the high-pressure shaft seal section and the low-pressure shaft seal section, and the requirements of various working conditions are met. For example, when the unit encounters poor vacuum of the condenser and the steam supply capacity of the shaft seal is insufficient, the shaft seal of the low-pressure section can be switched to an independent steam supply mode under the condition of no shutdown, and the relatively high steam supply pressure of the shaft seal is maintained so as to achieve better vacuum condition and not to influence the pressure of the shaft seal of the high-pressure section.
3. The low-pressure section shaft seal steam supply selects six sections of steam extraction steam supply after the unit operates, the temperature of the steam extraction steam supply is equal to the steam supply demand temperature of the low-pressure shaft seal, the low-pressure shaft seal can be directly supplied with steam under the condition of not reducing the temperature, and the problems of uncontrolled temperature and water in the steam caused by water spray temperature reduction are avoided.
4. When the high-pressure section or the low-pressure section steam supply regulating valve fails, one path of regulating valve is independently opened to meet the steam supply requirement of the whole system, so that the unit is ensured to start and stop smoothly, and the failure resistance of the unit is improved.
5. The operation safety of the unit is improved, the system is simple, the cost is low, and the design of a new unit and the transformation of an old unit are very convenient.
The foregoing inventive subject matter and various further alternatives thereof may be freely combined to form a plurality of alternatives, all of which are employable and claimed herein; and the utility model may be freely combined between choices (of non-conflicting choices) and with other choices as well. Various combinations will be apparent to those skilled in the art from a review of the present disclosure, and are not intended to be exhaustive or to limit the utility model to the precise forms disclosed.
Drawings
Fig. 1 is a schematic diagram of the structure of the present utility model.
In the figure: the device comprises a 1-high-medium pressure cylinder, a 2-low pressure cylinder, a 3-high pressure shaft seal, a 4-medium pressure shaft seal, a 5-low pressure shaft seal, a 6-shaft seal main pipe, a 7-high pressure shaft seal pipeline, an 8-low medium pressure shaft seal pipeline, a 9-low pressure shaft seal pipeline, 10-auxiliary steam, 11-final low-pressure addition, 12-extraction steam, 13-desuperheating water, 14-auxiliary steam regulating valve, 15-overflow regulating valve, 16-low pressure section regulating valve, 17-extraction steam shutoff valve, 18-auxiliary steam shutoff valve, 19-first check valve, 20-main pipe shutoff valve, 21-desuperheater, 22-desuperheating water regulating valve, 23-high pressure section pressure transmitter, 24-low pressure section pressure transmitter, 25-low pressure section thermocouple, 26-safety valve and 27-second check valve.
Detailed Description
The utility model will be further described with reference to specific examples and figures.
Example 1
Referring to fig. 1, a sectional steam turbine shaft seal steam supply system comprises a high-pressure cylinder 1, a low-pressure cylinder 2, a high-pressure shaft seal 3, a medium-pressure shaft seal 4, a low-pressure shaft seal 5, a shaft seal main pipe 6, a first auxiliary steam component, an overflow recovery component, a second auxiliary steam component, a steam supply component and a temperature reduction component.
The high and medium pressure cylinder 1 is an opposite high and medium pressure cylinder composed of high pressure and medium pressure, and the two ends of the high and medium pressure cylinder 1 are respectively provided with a high pressure shaft seal 3 and a medium pressure shaft seal 4. The low pressure cylinder 2 is an opposite low pressure cylinder composed of two low pressures, and the two ends of the low pressure cylinder 2 are respectively provided with a low pressure shaft seal 5.
The high-pressure shaft seal 3 is communicated with the high-pressure section of the shaft seal main pipe 6 through a high-pressure shaft seal pipeline 7, the medium-pressure shaft seal 4 is communicated with the high-pressure section of the shaft seal main pipe 6 through a low-medium-pressure shaft seal pipeline 8, and the low-pressure shaft seal 5 is communicated with the low-pressure section of the shaft seal main pipe 6 through a low-pressure shaft seal pipeline 9.
The first auxiliary steam component and the overflow recovery component are both communicated with a high-pressure section of the main shaft seal pipe 6, a main shaft pipe shutoff valve 20 is arranged between the high-pressure section and the low-pressure section of the main shaft seal pipe 6, the second auxiliary steam component, the steam supply component and the temperature reduction component are both communicated with the low-pressure section of the main shaft seal pipe 6, the temperature reduction component is arranged at a position on the main shaft seal pipe 6, which is close to the low-pressure shaft seal 5, and the second auxiliary steam component and the steam supply component are both communicated with a position on the main shaft seal pipe 6, which is located between the main shaft pipe shutoff valve 20 and the temperature reduction component.
The working flow of the utility model is as follows:
master control starts and shuts down mode: the main pipe shutoff valve 20 is opened, the first auxiliary steam component supplies steam to the high-pressure shaft seal 3 and the medium-pressure shaft seal 4 through the shaft seal main pipe 6, and the other path supplies steam to the low-pressure shaft seal 5 through the temperature reducing component. Master tube self-sealing operation mode: the main pipe shutoff valve 20 is opened, the high-pressure shaft seal 3 and the medium-pressure shaft seal 4 leak steam to the shaft seal main pipe 6, steam is supplied to the low-pressure shaft seal 5 through the temperature reduction assembly, and the redundant steam is recycled through the overflow recycling assembly. Sectional start-stop mode: the main pipe shutoff valve 20 is closed, the first auxiliary steam component supplies steam to the high-pressure shaft seal 3 and the medium-pressure shaft seal 4 through the shaft seal main pipe 6, and the second auxiliary steam component supplies steam to the low-pressure shaft seal 5 through the shaft seal main pipe 6 and the temperature reducing component. Sectional mode of operation: the main pipe shutoff valve 20 is closed, the high-pressure shaft seal 3 and the medium-pressure shaft seal 4 leak steam to the shaft seal main pipe 6, and the redundant steam is recycled through the overflow recycling assembly. Sectional special operation mode: and closing the steam supply assembly, and switching to the second auxiliary steam assembly to supply steam for the low-pressure shaft seal 5. Failure conditions: and in the start-stop stage, the first auxiliary steam component fails, the main pipe shutoff valve 20 is opened, and the second auxiliary steam component is utilized to supply steam to the shaft seal main pipe 6, so that the unit is safely started and stopped.
Example 2
Referring to fig. 1, a sectional turbine shaft seal steam supply system is provided, a high pressure section pressure transmitter 23 is arranged at a high pressure section of a shaft seal main pipe 6, a main pipe shut-off valve 20 is arranged between the high pressure section and a low pressure section of the shaft seal main pipe 6, a first check valve 19 connected in parallel with the main pipe shut-off valve 20 is arranged on the shaft seal main pipe 6, and a low pressure section pressure transmitter 24 and a low pressure section thermocouple 25 are arranged at the low pressure section of the shaft seal main pipe 6. The low pressure section of the shaft seal main 6 is also provided with a safety valve 26.
The first auxiliary steam component comprises an auxiliary steam 10, a first auxiliary steam pipeline and an auxiliary steam regulating valve 14, wherein the auxiliary steam 10 is communicated with the first auxiliary steam pipeline, the first auxiliary steam pipeline is provided with the auxiliary steam regulating valve 14, the first auxiliary steam pipeline is communicated with the high-pressure section of the main shaft seal pipe 6, and the main shaft seal pipe 6 is provided with a high-pressure section pressure transmitter 23 interlocked with the auxiliary steam regulating valve 14.
The overflow recovery assembly comprises a final-stage low-pressure tank 11, an overflow recovery pipeline and an overflow regulating valve 15, wherein the final-stage low-pressure tank 11 is communicated with the overflow recovery pipeline, the overflow recovery pipeline is provided with the overflow regulating valve 15, the overflow recovery pipeline is communicated with a high-pressure section of the main shaft seal pipe 6, and the main shaft seal pipe 6 is provided with a high-pressure section pressure transmitter 23 interlocked with the overflow regulating valve 15.
The second auxiliary steam component comprises an auxiliary steam 10, a second auxiliary steam pipeline, an auxiliary steam shut-off valve 18, a combining pipeline and a low-pressure section regulating valve 16, wherein the auxiliary steam 10 is communicated with the second auxiliary steam pipeline, the second auxiliary steam pipeline is provided with the auxiliary steam shut-off valve 18, the second auxiliary steam pipeline is communicated with the combining pipeline, the combining pipeline is provided with the low-pressure section regulating valve 16, the combining pipeline is communicated with the low-pressure section of the main shaft seal pipe 6, and the main shaft seal pipe 6 is provided with a low-pressure section pressure transmitter 24 interlocked with the low-pressure section regulating valve 16.
The steam supply assembly comprises a steam extraction 12 (six sections of steam extraction), a steam extraction pipeline, a second check valve 27, a steam extraction shutoff valve 17, a merging pipeline and a low-pressure section regulating valve 16, wherein the steam extraction 12 is communicated with the steam extraction pipeline, the steam extraction pipeline is provided with the second check valve 27 and the steam extraction shutoff valve 17, the steam extraction pipeline is communicated with the merging pipeline, the merging pipeline is provided with the low-pressure section regulating valve 16, the merging pipeline is communicated with the low-pressure section of the shaft seal main pipe 6, and the shaft seal main pipe 6 is provided with the low-pressure section pressure transmitter 24 interlocked with the low-pressure section regulating valve 16.
The temperature reducing assembly comprises temperature reducing water 13, a temperature reducing pipeline, a temperature reducing water regulating valve 22 and a temperature reducing device 21, wherein the temperature reducing water 13 is communicated with the temperature reducing pipeline, the temperature reducing pipeline is provided with the temperature reducing water regulating valve 22, the temperature reducing pipeline is communicated with the temperature reducing device 21, the temperature reducing device 21 is arranged on a shaft seal main pipe 6, and the shaft seal main pipe 6 is provided with a low-pressure section thermocouple 25 interlocked with the temperature reducing water regulating valve 22.
The working flow of the utility model is as follows:
master control starts and shuts down mode: the main pipe shutoff valve 20 is opened, the low-pressure section regulating valve 16 is closed, the steam extraction shutoff valve 17 is closed, the auxiliary steam shutoff valve 18 is closed, the overflow regulating valve 15 is closed, auxiliary steam enters the main shaft seal pipe 6 from the auxiliary steam 10 through the auxiliary steam regulating valve 14 to supply steam, one path supplies steam to the high-pressure shaft seal 3 and the medium-pressure shaft seal 4, the other path supplies steam to the low-pressure shaft seal 5 after the temperature is reduced to a given temperature through the main pipe shutoff valve 20, the high-pressure section pressure transmitter 23 interlocks the auxiliary steam regulating valve 14 to regulate the pressure to a given value, and the low-pressure section thermocouple 25 interlocks the temperature-reducing water regulating valve 22 to control the temperature to the given value.
Master tube self-sealing operation mode: the main pipe shutoff valve 20 is opened, the auxiliary steam regulating valve 14 is closed, the low-pressure section regulating valve 16 is closed, the steam extraction shutoff valve 17 is closed, the auxiliary steam shutoff valve 18 is closed, the high-pressure shaft seal 3 and the medium-pressure shaft seal 4 leak steam to the shaft seal main pipe 6, steam is supplied to the low-pressure shaft seal 5 through the main pipe shutoff valve 20 after passing through the desuperheater 21, excessive steam overflows to the final-stage low-pressure valve 11 through the overflow regulating valve 15, the high-pressure section pressure transmitter 23 interlocks the overflow regulating valve 15 to regulate the pressure to a given value, and the low-pressure section thermocouple 25 interlocks the temperature-reducing water regulating valve 22 to control the temperature to a given value.
Sectional start-stop mode: the main pipe shutoff valve 20 is closed, the steam extraction shutoff valve 17 is closed, the auxiliary steam shutoff valve 18 is opened, the low-pressure section regulating valve 16 is opened, the auxiliary steam regulating valve 14 is opened, and one path of auxiliary steam enters the shaft seal main pipe 6 through the auxiliary steam regulating valve 14 to supply steam to the high-pressure shaft seal 3 and the medium-pressure shaft seal 4; the other path of auxiliary steam supplies steam to the low-pressure shaft seal 5 after passing through the auxiliary steam shut-off valve 18, the low-pressure section regulating valve 16 and the attemperator 21, the high-pressure section pressure transmitter 23 interlocks the auxiliary steam regulating valve 14 to regulate the pressure to a given value, and the low-pressure section thermocouple 25 interlocks the attemperator regulating valve 22 to control the temperature to the given value.
Sectional mode of operation: the main pipe shutoff valve 20 is closed, the auxiliary steam regulating valve 14 is closed, the steam extraction shutoff valve 17 is opened, the auxiliary steam shutoff valve 18 is closed, the temperature-reducing water regulating valve 22 is closed, the high-pressure shaft seal 3 and the medium-pressure shaft seal 4 leak steam to the shaft seal main pipe 6, overflow to the final low pressure tank 11 through the overflow regulating valve 15, the high-pressure section pressure transmitter 23 interlocks the overflow regulating valve 15 to regulate the pressure of the high-pressure section to a given value, and the low-pressure section pressure transmitter 24 interlocks the low-pressure section regulating valve 16 to regulate the pressure of the low-pressure section to a given value, so that different pressure operation of the high-pressure section shaft seal and the low-pressure section shaft seal is realized.
Sectional special operation mode: the unit operates under special working conditions, such as a low-pressure cylinder cutting working condition, the extraction pressure is low, the extraction shutoff valve 17 can be closed, the auxiliary steam shutoff valve 18 and the temperature-reducing water regulating valve 22 are opened, the low-pressure section thermocouple 25 interlocks the temperature-reducing water regulating valve 22 to control the temperature to a given value, and the rest is the same as the sectional operation mode.
Failure conditions: the auxiliary steam regulating valve 14 fails in the starting and stopping stage, the unit faces the problem of steam supply interruption of the shaft seal, and the safety starting and stopping of the unit can be realized by opening the main pipe shutoff valve 20, the auxiliary steam shutoff valve 18 and the low-pressure section regulating valve 16 to supply steam to the shaft seal main pipe 6.
Otherwise, the same as in example 1 was conducted.
The foregoing basic embodiments of the utility model, as well as other embodiments of the utility model, can be freely combined to form numerous embodiments, all of which are contemplated and claimed. In the scheme of the utility model, each selection example can be arbitrarily combined with any other basic example and selection example.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. The utility model provides a sectional type steam turbine bearing seal steam supply system, includes high intermediate pressure jar (1) and low pressure jar (2), its characterized in that: the high-pressure and medium-pressure cylinder (1) on be equipped with high-pressure shaft seal (3) and middling pressure shaft seal (4), be equipped with low-pressure shaft seal (5) on low-pressure cylinder (2), high-pressure shaft seal (3) and middling pressure shaft seal (4) communicate the high-pressure section of shaft seal main pipe (6), the low-pressure section of low-pressure shaft seal (5) intercommunication shaft seal main pipe (6), first assistance vapour subassembly and overflow recovery unit all communicate the high-pressure section of shaft seal main pipe (6), be equipped with main pipe shutoff valve (20) between the high-pressure section and the low-pressure section of shaft seal main pipe (6), the low-pressure section that second assistance vapour subassembly, steam supply subassembly and temperature reduction subassembly all communicate shaft seal main pipe (6), the temperature reduction subassembly is established and is close to the position of low-pressure shaft seal (5) on shaft seal main pipe (6).
2. The segmented turbine shaft seal steam supply system of claim 1 wherein: the high-pressure and medium-pressure cylinder (1) is an opposite high-pressure and medium-pressure cylinder, the low-pressure cylinder (2) is an opposite low-pressure cylinder formed by two low pressures, the two ends of the high-pressure and medium-pressure cylinder (1) are respectively provided with a high-pressure shaft seal (3) and a medium-pressure shaft seal (4), and the two ends of the low-pressure cylinder (2) are respectively provided with a low-pressure shaft seal (5).
3. The segmented turbine shaft seal steam supply system of claim 1 or 2, wherein: the high-pressure shaft seal (3) is communicated with the shaft seal main pipe (6) through a high-pressure shaft seal pipeline (7), the medium-pressure shaft seal (4) is communicated with the shaft seal main pipe (6) through a low-medium-pressure shaft seal pipeline (8), and the low-pressure shaft seal (5) is communicated with the shaft seal main pipe (6) through a low-pressure shaft seal pipeline (9).
4. The segmented turbine shaft seal steam supply system of claim 1 wherein: the first auxiliary steam component comprises an auxiliary steam (10), a first auxiliary steam pipeline and an auxiliary steam regulating valve (14), wherein the auxiliary steam (10) is communicated with the first auxiliary steam pipeline, the first auxiliary steam pipeline is provided with the auxiliary steam regulating valve (14), the first auxiliary steam pipeline is communicated with a high-pressure section of the main shaft seal pipe (6), and the main shaft seal pipe (6) is provided with a high-pressure section pressure transmitter (23) interlocked with the auxiliary steam regulating valve (14).
5. The segmented turbine shaft seal steam supply system according to claim 1 or 4, wherein: the overflow recovery assembly comprises a final-stage low-pressure adding device (11), an overflow recovery pipeline and an overflow regulating valve (15), wherein the final-stage low-pressure adding device (11) is communicated with the overflow recovery pipeline, the overflow recovery pipeline is provided with the overflow regulating valve (15), the overflow recovery pipeline is communicated with a high-pressure section of a shaft seal main pipe (6), and a high-pressure section pressure transmitter (23) interlocked with the overflow regulating valve (15) is arranged on the shaft seal main pipe (6).
6. The segmented turbine shaft seal steam supply system of claim 1 wherein: the shaft seal main pipe (6) is provided with a first check valve (19) connected with the main pipe shutoff valve (20) in parallel, and the shaft seal main pipe (6) is also provided with a safety valve (26).
7. The segmented turbine shaft seal steam supply system according to claim 1 or 6, wherein: the second auxiliary steam component and the steam supply component are communicated with the shaft seal main pipe (6) and positioned between the main pipe shut-off valve (20) and the temperature reducing component.
8. The segmented turbine shaft seal steam supply system of claim 1 wherein: the second auxiliary steam component comprises an auxiliary steam (10), a second auxiliary steam pipeline, an auxiliary steam shut-off valve (18), a combining pipeline and a low-pressure section regulating valve (16), wherein the auxiliary steam (10) is communicated with the second auxiliary steam pipeline, the second auxiliary steam pipeline is provided with the auxiliary steam shut-off valve (18), the second auxiliary steam pipeline is communicated with the combining pipeline, the combining pipeline is provided with the low-pressure section regulating valve (16), the combining pipeline is communicated with the low-pressure section of the shaft seal main pipe (6), and the shaft seal main pipe (6) is provided with a low-pressure section pressure transmitter (24) interlocked with the low-pressure section regulating valve (16).
9. The segmented turbine shaft seal steam supply system of claim 1 or 8, wherein: the steam supply assembly comprises a steam extraction pipeline, a second check valve (27), a steam extraction shutoff valve (17), a merging pipeline and a low-pressure section regulating valve (16), the steam extraction pipeline is communicated with the steam extraction pipeline, the steam extraction pipeline is provided with the second check valve (27) and the steam extraction shutoff valve (17), the steam extraction pipeline is communicated with the merging pipeline, the merging pipeline is provided with the low-pressure section regulating valve (16), the merging pipeline is communicated with the low-pressure section of the shaft seal main pipe (6), and the shaft seal main pipe (6) is provided with a low-pressure section pressure transmitter (24) interlocked with the low-pressure section regulating valve (16).
10. The segmented turbine shaft seal steam supply system of claim 1 wherein: the temperature reducing assembly comprises temperature reducing water (13), a temperature reducing pipeline, a temperature reducing water regulating valve (22) and a temperature reducing device (21), wherein the temperature reducing water (13) is communicated with the temperature reducing pipeline, the temperature reducing pipeline is provided with the temperature reducing water regulating valve (22), the temperature reducing pipeline is communicated with the temperature reducing device (21), the temperature reducing device (21) is arranged on a shaft seal main pipe (6), and a low-pressure section thermocouple (25) interlocked with the temperature reducing water regulating valve (22) is arranged on the shaft seal main pipe (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322493922.8U CN220667651U (en) | 2023-09-13 | 2023-09-13 | Sectional type steam turbine shaft seal steam supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322493922.8U CN220667651U (en) | 2023-09-13 | 2023-09-13 | Sectional type steam turbine shaft seal steam supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220667651U true CN220667651U (en) | 2024-03-26 |
Family
ID=90338704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322493922.8U Active CN220667651U (en) | 2023-09-13 | 2023-09-13 | Sectional type steam turbine shaft seal steam supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220667651U (en) |
-
2023
- 2023-09-13 CN CN202322493922.8U patent/CN220667651U/en active Active
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