CN113775381A - Steam turbine gland seal balanced system based on combination of polymorphic type valve - Google Patents
Steam turbine gland seal balanced system based on combination of polymorphic type valve Download PDFInfo
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- CN113775381A CN113775381A CN202110986451.7A CN202110986451A CN113775381A CN 113775381 A CN113775381 A CN 113775381A CN 202110986451 A CN202110986451 A CN 202110986451A CN 113775381 A CN113775381 A CN 113775381A
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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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
- F01D11/06—Control thereof
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- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention relates to a steam turbine steam seal balance system based on multi-type valve combination, which is used for realizing the stability of steam pressure in the steam seal balance system. The invention splits the steam supply pipeline and the steam exhaust pipeline into two valve groups, so that the steam supply management and the steam exhaust management can respectively and independently operate. Under the condition that a turbine balance system is in stable operation, the turbine balance system can be in a non-steam-supplementing and non-steam-discharging state, the problem of valve rod jumping in the use of a traditional steam seal pressure regulator is solved, a common self-operated pressure regulating valve and a standby electric valve are arranged in parallel, and a manual stop valve is arranged, so that the self-operated pressure regulating valve has non-stop maintenance capability and the influence of single valve fault on the integral operation of a turbine is reduced.
Description
Technical Field
The invention relates to a steam turbine gland seal balance system, in particular to a steam turbine gland seal balance system for a ship.
Background
The marine steam turbine is in a closed cabin, once internal steam leaks, the marine steam turbine forms a great hidden danger for the life health and safety of sailors, and therefore the marine steam turbine has higher requirements on the sealing performance of a shaft seal structure compared with a civil steam turbine.
The shaft seal structure of the marine steam turbine is divided into a front steam seal part and a rear steam seal part. The steam seal at each position is connected with a steam seal balance system and a steam seal steam extraction system in a subsection mode. The design pressure of the steam seal balance system is usually slightly greater than the atmospheric pressure, and the design pressure of the steam seal extraction system is slightly less than the atmospheric pressure.
The pressure inside the gland balance system has very important influence on the overall operation state of the steam turbine. If the pressure of the steam seal balance system is too high, more working new steam is extracted by the steam seal steam extraction system, so that the whole steam consumption of the steam turbine is increased. If the pressure of the steam seal balance system is too low, more steam inside the steam turbine flows into the steam seal balance system and then directly enters the condenser, and the output power and the efficiency of the steam turbine are reduced simultaneously.
The existing common steam seal balance system mostly uses a steam seal pressure regulator to realize the control of the pressure of the steam seal balance system. The steam seal balance system is connected with the high-pressure new steam and the low-pressure condenser through a steam seal pressure regulator.
Fig. 1 shows a currently-used hydraulic gland regulator, see (a) in fig. 1, and an electric gland regulator, see (b) in fig. 1. It can be observed from fig. 1 that the basic principles of both types of gland pressure regulators are identical:
the steam seal pressure regulator is provided with three steam interfaces which are respectively connected with a high-pressure new steam pipe, a low-pressure condenser pipeline and a steam seal balance system. When the pressure is higher, the pipeline of the low-pressure condenser is connected with the steam seal balance system, and steam flows into the condenser from the steam seal balance system, so that the pressure of the steam seal balance system is reduced. When the pressure is lower, the steam seal balance system is connected with the high-pressure new steam pipe, and steam flows into the steam seal balance system from the new steam pipe, so that the pressure of the steam seal balance system is increased.
Although the traditional gland sealing pressure regulator has the advantages of simple structure and high integration level, the structure of the traditional gland sealing pressure regulator also has the inevitable defects:
(1) valve stem oscillation
Conventional vapor lock pressure regulators have only two operating states: a steam supplementing state and a steam extracting state. There is no theoretical work of neither steam supply nor steam extraction. When the pressure inside the gland balance system is around the target pressure. The over-reaction phenomenon is easy to generate, so that the steam seal pressure regulator is switched between a steam supplementing state and a steam extraction stage, and the valve rod is further caused to oscillate up and down. This oscillation can wear the seal on the valve stem, making the stem position of the gland pressure regulator more susceptible to steam leakage.
(2) Jamming of valve stem
If steam leaks from the position of the valve rod, the steam encounters external cold air and is condensed into water drops to cover the gland and the shell of the steam seal pressure regulator. After long-time operation, the parts are easy to corrode, and the valve rod part is blocked. The jamming of the valve rod can cause the pressure of a steam seal pressure balance system to be too high or too low, and further the overall performance of the steam turbine is affected.
For a traditional steam seal pressure regulator, after the steam seal pressure regulator is blocked, the valve rod blocking state can be relieved by pulling the manual reset rod after the steam turbine is stopped. The valve stem jam fault can continuously affect the normal operation of the steam turbine before the shutdown.
(3) Degree of system complexity
The traditional gland sealing pressure regulator needs to be matched with a complex oil supply system, an oil signal detection system, a control box, a power supply system and UPS power lamp equipment. The whole corollary equipment is comparatively complicated.
Disclosure of Invention
The invention provides a steam turbine steam seal balancing system based on multi-type valve combination, which has higher reliability and maintainability and solves the problem of the traditional steam seal pressure regulator.
In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides a steam turbine gland balance system based on polymorphic type valve combination for realize the stability of steam pressure in the gland balance system, this system comprises the benefit vapour pipeline and the exhaust steam pipeline of connecting the gland balance system, benefit vapour pipeline and exhaust steam pipeline can independent operation respectively.
Further, the steam supply pipeline consists of a manual stop valve of a steam supply pipeline pressure reducing valve, a self-operated pressure regulating valve of the steam supply pipeline and a manual stop valve which are connected in sequence; the pipelines connected with the manual stop valve, the steam supplementing pipeline self-operated pressure regulating valve and the manual stop valve are connected in parallel with a steam supplementing pipeline electric valve; the steam compensating pipeline pressure reducing valve is positioned on the front side of the steam compensating pipeline, so that the steam pressure entering the steam seal balancing system can be controlled.
Further, when the pressure of the steam seal balance system is too low, new steam enters the steam seal balance system of the steam turbine through a branch of a steam supply pipeline pressure reducing valve, a manual stop valve, a steam supply pipeline self-operated pressure regulating valve and a manual stop valve; at the moment, the self-operated pressure regulating valve in the steam exhaust pipeline is in a closed state.
Further, the self-operated pressure regulating valve of the steam compensating pipeline is a self-operated pressure regulating valve which adopts the pressure of the steam seal balance pipeline as a control signal, the opening degree of the valve is automatically reduced under the condition of pressure rise, and the opening degree of the valve is automatically increased under the condition of pressure fall, so that the self-operated regulation of the steam compensating pipeline is realized.
Further, when the steam supply pipeline self-operated pressure regulating valve breaks down, and the pressure of the steam seal balance system is too high or too low, the electric valve of the steam supply pipeline and the electric valve of the steam exhaust pipeline in the steam exhaust pipeline are automatically opened, and the manual stop valve are closed, so that the steam supply pipeline self-operated pressure regulating valve can be maintained under the operation of the unit.
Furthermore, the steam exhaust pipeline consists of a steam exhaust pipeline pressure reducing valve, a manual stop valve, a steam exhaust pipeline self-operated pressure regulating valve and a manual stop valve which are connected in sequence; and the pipeline connected with the manual stop valve, the exhaust pipeline self-operated pressure regulating valve and the manual stop valve is connected with an electrically operated valve of the exhaust pipeline in parallel.
Further, when the pressure of the steam seal system is too high, new steam flows out of the steam seal balance system through a branch of the manual stop valve, the steam exhaust pipeline self-operated pressure regulating valve, the manual stop valve and the steam exhaust pipeline pressure reducing valve, and at the moment, the steam supplementing pipeline self-operated pressure regulating valve in the steam exhaust pipeline is in a closed state.
Further, when the self-operated pressure regulating valve of the steam exhaust pipeline is damaged, the electric valve of the steam supplementing pipeline and the electric valve of the steam exhaust pipeline are automatically opened, and the manual stop valve are closed to maintain the self-operated pressure regulating valve of the steam exhaust pipeline under the operation of a unit.
Furthermore, the steam supplementing pipeline self-operated pressure regulating valve and the steam discharging pipeline self-operated pressure regulating valve have the same structure and consist of a regulating valve shell, a spring, a valve rod, a steam inlet, a steam outlet, a push rod and a control inlet, wherein the control inlet is connected with the steam pipeline through a signal pipe.
The invention has the beneficial effects that:
the steam turbine gland seal balance system based on the multi-type valve combination has the following advantages:
1. the steam supply pipeline and the steam exhaust pipeline are split into two valve banks, so that steam supply management and steam exhaust management can be operated independently. Under the condition that a turbine balance system is in stable operation, the turbine balance system can be in a non-steam-supplementing and non-steam-exhausting state, and the problem of valve rod jumping in the use of a traditional steam seal pressure regulator is solved.
2. The common self-operated pressure regulating valve and the standby electric valve are arranged in parallel, and the manual stop valve is arranged, so that the self-operated pressure regulating valve has the non-stop maintenance capability and the influence of single valve fault on the integral operation of the steam turbine is reduced.
Drawings
FIG. 1 is a diagram of a conventional vapor lock pressure regulator configuration;
wherein: (a) a hydraulic steam seal pressure regulator, (b) an electric steam seal pressure regulator;
FIG. 2 is a diagram of a turbine gland balance system based on multiple types of valve combinations according to the present invention;
FIG. 3 is a schematic structural view of a self-operated pressure regulating valve;
fig. 4 is a schematic view of the electric valve.
Detailed Description
The invention will be further explained with reference to the following drawings and examples
As shown in fig. 2 to 4, the steam turbine steam seal balance system based on the combination of the multiple types of valves is used for realizing the stability of steam pressure in the steam seal balance system, and the system comprises a steam supply pipeline pressure reducing valve 1, a manual stop valve 2, a steam supply pipeline self-operated pressure regulating valve 3, a steam supply pipeline electric valve 4, a manual stop valve 5, a steam exhaust pipeline pressure reducing valve 6, a steam exhaust pipeline electric valve 7, a manual stop valve 8, a steam exhaust pipeline self-operated pressure regulating valve 9 and a manual stop valve 10.
The assembly positions of the respective sleeves are shown in detail in FIG. 2.
The steam supply pipeline is formed by a valve group consisting of a steam supply pipeline pressure reducing valve 1, a manual stop valve 2, a steam supply pipeline self-operated pressure regulating valve 3, a steam supply pipeline electric valve 4 and a manual stop valve 5; the steam supply pipeline pressure reducing valve 1 is connected with a steam seal balance system of the steam turbine sequentially through a manual stop valve 2, a steam supply pipeline self-operated pressure regulating valve 3 and a manual stop valve 5, and a steam supply pipeline electric valve 4 is connected in parallel with a pipeline connected with the manual stop valve 2, the steam supply pipeline self-operated pressure regulating valve 3 and the manual stop valve 5; the steam exhaust pipeline pressure reducing valve is characterized in that a steam exhaust pipeline is formed by a valve group consisting of a steam exhaust pipeline pressure reducing valve 6, a steam exhaust pipeline electric valve 7, a manual stop valve 8, a steam exhaust pipeline self-operated pressure regulating valve 9 and a manual stop valve 10, wherein the steam exhaust pipeline pressure reducing valve 6 is sequentially connected with the manual stop valve 8, the steam exhaust pipeline self-operated pressure regulating valve 9 and the manual stop valve 10, and the steam exhaust pipeline electric valve 7 is connected in parallel with pipelines connected with the manual stop valve 8, the steam exhaust pipeline self-operated pressure regulating valve 9 and the manual stop valve 10. Wherein each manual stop valve is in the normal open mode, only closes in the maintenance. The electric valve of the steam supply pipeline and the electric valve of the steam exhaust pipeline are in a normally closed standby state.
When the pressure of the steam seal system is too low, new steam mainly enters the steam seal balance system of the steam turbine 100 through a branch of a steam supply pipeline pressure reducing valve 1, a manual stop valve 2, a steam supply pipeline self-operated pressure regulating valve 3 and a manual stop valve 5. At this time, the exhaust pipeline self-operated pressure regulating valve 9 in the exhaust pipeline is in a closed state.
The new steam comes directly from the boiler and has the same pressure as the main steam pressure of the turbine. To reduce the impact of new steam injection on the gland balance system. Therefore, the steam compensating pipeline pressure reducing valve 1 is designed to be positioned at the front side of the steam compensating pipeline, so that the steam pressure entering the steam seal balancing system can be controlled.
The self-operated pressure regulating valve 3 of the steam supply pipeline uses the pressure of the steam seal balance pipeline as a control signal, automatically reduces the valve opening degree under the condition of pressure rising, and automatically increases the valve opening degree under the condition of pressure falling, thereby realizing the self-operated regulation of the steam supply pipeline.
When the self-operated pressure regulating valve 3 of the steam supply pipeline fails, the pressure of the steam seal balance system is too high or too low, and the electric valve 4 of the steam supply pipeline and the electric valve 7 of the steam exhaust pipeline automatically work. If the self-operated pressure regulating valve of the steam supplementing pipeline is blocked in a closed state, the electric valve of the steam supplementing pipeline is opened to provide steam for the steam seal balance system. If the self-operated pressure regulating valve of the steam supplementing pipeline is blocked in an open state, the electric valve of the steam exhaust pipeline is opened to exhaust redundant steam for the steam seal balance system. At the moment, the steam compensating pipeline self-operated pressure regulating valve can be maintained by manually closing the manual stop valve 2 and the manual stop valve 5 under the operation of the unit.
When the pressure of the steam seal system is too high, the new steam mainly flows out of the steam seal balance system through a branch of the manual stop valve 10, the steam exhaust pipeline self-operated pressure regulating valve 9, the manual stop valve 8 and the steam exhaust pipeline pressure reducing valve 6. At the moment, the self-operated pressure regulating valve of the steam supplementing pipeline in the steam exhaust pipeline is in a closed state.
The pressure in the steam seal balance system is also a certain pressure difference compared with the pressure in the condenser, so that the steam is discharged into the condenser after being subjected to primary pressure reduction through the steam discharge pipeline pressure reducing valve.
The self-operated pressure regulating valve of the steam exhaust pipeline uses the pressure of the steam seal balance pipeline as a control signal, the opening degree of the valve is automatically increased under the condition of pressure rising, and the opening degree of the valve is automatically reduced under the condition of pressure falling, so that the self-operated regulation of the steam exhaust pipeline is realized.
The structure of the steam compensating pipeline is similar to that of the steam compensating pipeline, and when the self-operated pressure regulating valve of the steam exhaust pipeline is damaged, the electric valve of the steam compensating pipeline and the electric valve of the steam exhaust pipeline automatically work. At this time, the manual stop valve 10 and the manual stop valve 8 are closed, so that the self-operated pressure regulating valve of the steam exhaust pipeline can be maintained.
In conclusion, after the steam turbine steam seal balance system with the combination of the multiple types of valves is adopted, the system has the capability of maintenance in operation, the electric valve of the steam exhaust pipeline can be adjusted in an intervention manner at the first time when the self-operated pressure regulating valve breaks down, and the influence of the failure on the normal operation of the steam turbine is reduced to the maximum extent.
As shown in fig. 3, the self-operated pressure regulating valve mainly comprises a regulating valve housing 11, a spring 12, a valve rod 13, a steam inlet 14, a steam outlet 15, a push rod 16 and a control inlet 17. Wherein the control inlet is connected with the steam pipeline through a signal pipe. The self-operated pressure regulating valve has the main function that the position of the valve rod can be automatically regulated through the pressure change of the steam pipeline, and then the flow passing through the valve is regulated.
As shown in fig. 4, the electric desuperheating valve adopts a conventional valve structure. The steam valve mainly comprises an actuator 21, a valve rod 22, a shell 23, a steam inlet 24 and a steam outlet 25. The primary function of an electrically operated desuperheater valve is to control the movement of the valve stem position through an actuator and thus control the flow through the valve.
And (4) independently producing, processing and connecting the pressure reducing valve, the self-operated pressure regulating valve, the electric valve, the connecting pipeline and other part sleeves. The control inlet of the self-operated pressure regulating valve is connected to the steam pipeline, and the electric temperature reducing valve is connected with the control box and the power supply. And connecting the inlet of the system with a new steam inlet pipeline, and connecting the outlet of the system with a condenser, thus finishing the installation of the steam turbine steam seal balance system based on the combination of various valves.
Claims (9)
1. The utility model provides a steam turbine gland sealing balanced system based on polymorphic type valve combination for realize the stability of steam pressure in the gland sealing balanced system, its characterized in that: the system consists of a steam supplementing pipeline and a steam discharging pipeline which are connected with a steam seal balance system, wherein the steam supplementing pipeline and the steam discharging pipeline can respectively and independently operate.
2. The steam turbine gland balance system based on multiple types of valve combinations according to claim 1, wherein: the steam supply pipeline consists of a steam supply pipeline pressure reducing valve (1), a manual stop valve (2), a steam supply pipeline self-operated pressure regulating valve (3) and a manual stop valve (5) which are connected in sequence; the pipelines connected with the manual stop valve (2), the steam-supply pipeline self-operated pressure regulating valve (3) and the manual stop valve (5) are connected with a steam-supply pipeline electric valve (4) in parallel; the steam supplementing pipeline pressure reducing valve (1) is positioned on the front side of the steam supplementing pipeline, so that the steam pressure entering the steam seal balancing system can be controlled.
3. The turbine gland seal balancing system based on multiple types of valve combinations according to claim 2, wherein: when the pressure of the steam seal balance system is too low, new steam enters the steam seal balance system of the steam turbine through a branch of a steam supplementing pipeline pressure reducing valve (1), a manual stop valve (2), a steam supplementing pipeline self-operated pressure regulating valve (3) and a manual stop valve (5); at the moment, a self-operated pressure regulating valve (9) in the steam exhaust pipeline is in a closed state.
4. The turbine gland seal balancing system based on multiple types of valve combinations according to claim 2, wherein: the self-operated pressure regulating valve (3) of the steam compensating pipeline is a self-operated pressure regulating valve which adopts the pressure of a steam seal balance pipeline as a control signal, the opening degree of the valve is automatically reduced under the condition of pressure rise, and the opening degree of the valve is automatically increased under the condition of pressure fall, so that the self-operated regulation of the steam compensating pipeline is realized.
5. The turbine gland seal balancing system based on multiple types of valve combinations according to claim 2, wherein: when the steam compensating pipeline self-operated pressure regulating valve (3) breaks down, and the pressure of the steam seal balance system is too high or too low, the electric valve (4) of the steam compensating pipeline and the electric valve (7) of the steam exhaust pipeline are automatically opened, and the manual stop valve (2) and the manual stop valve (5) are closed to maintain the self-operated pressure regulating valve (3) of the steam compensating pipeline under the operation of the unit.
6. The steam turbine gland balance system based on multiple types of valve combinations according to claim 1, wherein: the steam exhaust pipeline is composed of a steam exhaust pipeline pressure reducing valve (6), a manual stop valve (8), a steam exhaust pipeline self-operated pressure regulating valve (9) and a manual stop valve (10) which are sequentially connected; and the pipelines connected with the manual stop valve (8), the exhaust pipeline self-operated pressure regulating valve (9) and the manual stop valve (10) are connected with an exhaust pipeline electric valve (7) in parallel.
7. The turbine gland seal balancing system based on multiple types of valve combinations according to claim 6, wherein: when the pressure of the steam seal system is too high, new steam flows out of the steam seal balance system through a branch of the manual stop valve (10), the steam exhaust pipeline self-operated pressure regulating valve (9), the manual stop valve (8) and the steam exhaust pipeline pressure reducing valve (6), and at the moment, the steam supplementing pipeline self-operated pressure regulating valve (3) in the steam exhaust pipeline is in a closed state.
8. The turbine gland seal balancing system based on multiple types of valve combinations according to claim 6, wherein: when the self-operated pressure regulating valve (9) of the steam exhaust pipeline is damaged, the electric valve (4) of the steam supplement pipeline and the electric valve (7) of the steam exhaust pipeline are automatically opened, and the manual stop valve (10) and the manual stop valve (8) are closed to maintain the self-operated pressure regulating valve (9) of the steam exhaust pipeline under the operation of a unit.
9. The turbine gland seal balancing system based on multiple types of valve combinations according to claim 2 or 6, wherein: the steam compensating pipeline self-operated pressure regulating valve (3) and the steam discharging pipeline self-operated pressure regulating valve (9) are identical in structure and comprise a regulating valve shell (11), a spring (12), a valve rod (13), a steam inlet (14), a steam outlet (15), a push rod (16) and a control inlet (17), wherein the control inlet (17) is connected with the steam pipeline through a signal pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110986451.7A CN113775381A (en) | 2021-08-26 | 2021-08-26 | Steam turbine gland seal balanced system based on combination of polymorphic type valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110986451.7A CN113775381A (en) | 2021-08-26 | 2021-08-26 | Steam turbine gland seal balanced system based on combination of polymorphic type valve |
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| CN113775381A true CN113775381A (en) | 2021-12-10 |
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| CN202110986451.7A Pending CN113775381A (en) | 2021-08-26 | 2021-08-26 | Steam turbine gland seal balanced system based on combination of polymorphic type valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115126552A (en) * | 2022-07-26 | 2022-09-30 | 中国船舶重工集团公司第七0四研究所 | Through-flow valve block structure with safety valve arranged outside machine |
| CN115126552B (en) * | 2022-07-26 | 2024-06-04 | 中国船舶集团有限公司第七〇四研究所 | Flow valve group structure with safety valve arranged outside machine |
-
2021
- 2021-08-26 CN CN202110986451.7A patent/CN113775381A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115126552A (en) * | 2022-07-26 | 2022-09-30 | 中国船舶重工集团公司第七0四研究所 | Through-flow valve block structure with safety valve arranged outside machine |
| CN115126552B (en) * | 2022-07-26 | 2024-06-04 | 中国船舶集团有限公司第七〇四研究所 | Flow valve group structure with safety valve arranged outside machine |
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