CN109404067B - Turbine expander spiral case - Google Patents
Turbine expander spiral case Download PDFInfo
- Publication number
- CN109404067B CN109404067B CN201811542344.XA CN201811542344A CN109404067B CN 109404067 B CN109404067 B CN 109404067B CN 201811542344 A CN201811542344 A CN 201811542344A CN 109404067 B CN109404067 B CN 109404067B
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- CN
- China
- Prior art keywords
- valve
- volute
- quick
- valve disc
- flange
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000005540 biological transmission Effects 0.000 claims abstract description 3
- 238000012856 packing Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
-
- 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
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
-
- 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
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
Abstract
The invention discloses a turbine expander volute, which comprises a volute casing and a quick-closing valve, wherein the quick-closing valve comprises: a valve rod driven by a pneumatic or hydraulic or electromagnetic driving device and a valve disc for closing an air inlet of the inner wall of the volute; the valve disc moves up and down in the transmission of the valve rod. Compared with the case that the quick-closing valve is arranged on an inlet pipeline, the quick-closing valve is arranged on the inlet pipeline, the response speed of interlocking parking is faster, and the safety of the unit is greatly improved.
Description
Technical Field
The invention belongs to the technical field of turbomachinery, and particularly relates to a turbine expander volute.
Background
Turboexpanders are machines that utilize the principle of mechanical work output to the outside when compressed gas expands to reduce the temperature of the gas to achieve a nearly adiabatic isentropic expansion process to obtain energy, typically by a main shaft coupled to an impeller, to brake devices such as a booster, generator, blower, pump, oil brake, etc.
The turbine expander generally comprises an expander flow-through part, a brake and a machine body. The flow passage part of the expander is a key part for obtaining low temperature and comprises a volute, a nozzle, a working wheel and a diffuser.
When the turbine expander works, working medium flows in from the volute inlet, flows through the nozzle and pushes the impeller blades to enable the impeller to move, so that the main shaft is driven to rotate, and torque is transmitted. During the flow of the working medium in the volute, the air flow continuously and uniformly flows to the nozzle, so that the sectional area of the volute is always reduced from the inlet to the tail end.
The monitoring of the turbine expander operating parameters generally includes measuring points such as rotational speed, vibration, bearing temperature, seal air pressure, gap pressure, oil temperature, etc. Before starting, when the measured values of the measuring points meet the starting conditions, a starting signal can be sent to a quick-closing valve through a control system such as a PLC or a DCS through manual operation, so that the starting of the unit is realized; when the fault stops, when the measured value of the measuring point exceeds the interlocking set value, a control system such as a PLC or a DCS automatically sends an interlocking signal to a quick-closing valve of the expander through interlocking logic, so that the aim of emergency stop and machine safety guarantee is fulfilled; when the vehicle is parked normally, the unit is lowered to a certain rotating speed by closing the opening of the nozzle, and a parking signal is sent to the quick-closing valve by manual operation of a PLC (programmable logic controller) or a DCS (distributed control system) and the like, so that the normal parking is completed.
The turbo expander is used as equipment rotating at a high speed, and in the working process, emergency situations can be occasionally encountered, timely interlocking stop is required, and the requirements on emergency stop response time are extremely severe. The prior art turbine expander volutes are generally provided with only a nozzle flow regulator, and a quick-shut valve is arranged on an inlet pipeline of the expander, and the prior art turbine expander can be shut down, but the following defects exist: firstly, the external quick-closing valve is sometimes limited by the arrangement of a pipeline, so that the quick-closing valve is separated from the expander for a certain distance, working medium in the pipeline still enters the expander after being interlocked, the requirement of quick closing during interlocking is difficult to be met, and the safety of the turbine expander has a great hidden trouble; secondly, the manufacturing process of the valve body of the external quick-closing valve in the prior art is generally casting, and the supply period is longer; thirdly, in the prior art, the pressure and temperature measuring points of the expander are generally arranged on an inlet and outlet pipeline, but not on a volute, so that measurement errors exist, and the performance of the expander cannot be accurately reflected; .
Disclosure of Invention
The invention provides a turbine expander volute, which can enable the response speed of a turbine expander to be faster when the turbine expander is stopped in an interlocking way, improve the safety of a machine, and enable a quick-closing valve to be directly arranged on the volute without a valve body, so that the cost is saved, and the construction period is shortened.
A turbine expander volute comprising a volute housing and a quick-shut valve, wherein the quick-shut valve comprises: a valve rod driven by a pneumatic or hydraulic or electromagnetic driving device and a valve disc for closing an air inlet of the inner wall of the volute;
the valve disc moves up and down in the transmission of the valve rod.
According to the invention, by transferring the quick-closing valve from the inlet pipeline of the external expander to the air inlet of the volute of the expander, when the expander is required to be stopped in an interlocking way under emergency conditions, the response time is greatly shortened.
Preferably, the quick-closing valve further comprises: a valve disc cover plate and a pre-opened valve body;
the valve rod penetrates through the cover plate through hole to be fixedly connected with the pre-opened valve body;
the valve disc is provided with a pressure relief channel and a pre-opening channel;
the valve rod can pull the valve disc and move the valve disc cover plate through the pre-opening valve body;
the pressure relief channel takes the valve rod as a central shaft and is uniformly distributed on the circumference of the valve disc;
the pre-opening valve body can move in a pre-opening channel of the valve disc and is matched with the water level in the valve disc at the pressure relief channel.
Preferably, the volute casing is provided with a quick-closing valve mounting port, and a flange is fixed at the quick-closing valve mounting port;
the driving device is connected and fixed with the flange through a connecting pipe, an upper flange of the connecting pipe is fixed with the driving device, and a lower flange of the connecting pipe is fixed with the flange;
a channel is arranged in the flange, and the channel in the connecting pipe form a valve rod channel with full stroke;
the upper end of the corrugated pipe is fixed and sealed with the upper flange of the connecting pipe, and the lower end of the corrugated pipe is fixed with the valve rod in a welding way;
and a packing seal is arranged between the valve rod and the flange.
Preferably, the volute is provided with a temperature and pressure measuring port, and the temperature and pressure measuring port is provided with a measuring instrument for measuring the temperature and pressure of the working medium.
Preferably, a blow-off valve is arranged at the bottom of the volute;
preferably, the driving device can be manually or automatically controlled by a control system such as a PLC or a DCS.
Compared with the prior art, the invention has the beneficial effects that:
(1) The turbine expander volute has higher response speed when the interlocking stop is needed;
(2) Compared with the condition that the measuring point is arranged outside the pipeline, the measuring error is small, the data acquisition accuracy of the expander is improved, and particularly, under the condition that the outlet of the expander is provided with liquid, the temperature measurement accuracy has great influence on the efficiency accounting of the expander.
(3) The quick-closing valve is directly arranged on the volute without a valve body, so that the cost is saved, and the construction period is shortened;
(4) When the expansion machine needs to be opened, the valve rod is pulled to move upwards in the pre-opening channel of the valve disc, so that a small amount of gas firstly enters the volute through the pressure release channel of the valve disc, the pressure difference on two sides of the valve disc is reduced, and the opening force of the quick-closing valve is reduced.
5. The valve rod is provided with the corrugated pipe, so that working medium is effectively prevented from leaking outwards along a valve rod sealing gap, the left and right sealing is achieved, and the corrugated pipe can perform stress compensation on the valve rod in a low-temperature state.
Drawings
FIG. 1 is a cross-sectional elevation view of the scroll construction of the turboexpander of the present invention.
Fig. 2 is a left side view of a turbine expander volute section of the present invention.
Fig. 3 is a partial cross-sectional view of a scroll of a turboexpander of the present invention.
FIG. 4 is a turbine expander volute outline view structure of the present invention
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As can be seen from the schematic structural diagram of the scroll casing of the turboexpander shown in fig. 1, the scroll casing of the turboexpander of the present invention mainly includes a scroll casing 2 and a quick-closing valve 1 for closing the intake port at the intake port.
As a specific embodiment, the quick-closing valve 1 comprises a valve rod 1.4 driven by a pneumatic or hydraulic or electromagnetic driving device 1.1, a valve disc 1.8 matched with an air inlet of the inner wall of a volute 2, a valve disc cover plate 1.6 and a pre-opening valve body 1.7;
the quick-closing valve 1 can be manually or automatically controlled and interlocked by signals of a control system such as a PLC or a DCS. When the measured values of the rotation speed, vibration, oil temperature, oil pressure and the like obtained by the primary instrument exceed the interlocking set values, a control system such as a PLC or DCS automatically sends an interlocking stop signal to the driving device 1.1, the driving device 1.1 works, the driving valve rod 1.4 descends, the air inlet of the volute 2 is sealed, and the quick closing of the expander is realized. When the control systems such as the PLC or the DCS judge that the measured measurement values of the measured points meet the driving conditions, the control systems such as the PLC or the DCS send driving signals to the driving device 1.1 through manual operation, the driving valve rod 1.4 pulls the valve disc 1.8 to rise, and the air inlet of the volute 2 is opened. When the expander is required to be opened, the valve rod 1.4 is pulled to move upwards in the pre-opening channel of the valve disc 1.8 in the process of lifting the valve rod 1.7 upwards, and the valve disc 1.8 is not moved at the moment, so that a small amount of gas enters the volute 2 through the pressure release channels uniformly distributed on the circumference of the valve disc 1.8, the pressure difference on two sides of the valve disc 1.8 is reduced, and the opening force of the quick-closing valve 1 is reduced; when the driving device 1.1 drives the valve rod 1.4 to continuously ascend, the valve rod 1.4 can drive the valve disc 1.8 to continuously ascend, and at the moment, the air inlet of the volute 2 is completely opened, so that the expander can normally work.
The volute 2 is provided with an inlet temperature measuring port 2.2, an inlet pressure measuring port 2.1, an outlet temperature measuring port 2.4 and an outlet pressure measuring port 2.3, and the temperature measuring pressure measuring port is provided with a measuring instrument for measuring the temperature and the pressure of working media and is used for monitoring the pressure and the temperature of an inlet and an outlet of an expansion machine and ensuring the stable operation of the machine.
The foregoing detailed description of the preferred embodiments and advantages of the invention will be appreciated that the foregoing description is merely illustrative of the presently preferred embodiments of the invention, and that no changes, additions, substitutions and equivalents of those embodiments are intended to be included within the scope of the invention.
Claims (5)
1. A turbine expander volute comprising a volute housing (2) and a quick-closing valve (1), characterized in that the quick-closing valve (1) comprises: a valve rod (1.4) driven by a pneumatic or hydraulic or electromagnetic driving device (1.1) and a valve disc (1.8) for closing an air inlet of the inner wall of the volute casing (2);
the valve disc (1.8) moves up and down in the transmission of the valve rod (1.4);
the quick-closing valve (1) further comprises: a valve disc cover plate (1.6) and a pre-opening valve body (1.7);
the valve disc cover plate (1.6) is fixed with the valve disc (1.8), a through hole is arranged in the center, and the valve rod (1.4) passes through the cover plate through hole to be fixedly connected with the pre-opened valve body (1.7);
the valve disc (1.8) is provided with a pressure relief channel and a pre-opening channel;
the valve rod (1.4) pulls the valve disc (1.8) to move through the pre-opening valve body (1.7) and the valve disc cover plate (1.6);
the pressure relief channel takes the valve rod (1.4) as a central shaft and is uniformly distributed on the circumference of the valve disc (1.8);
the pre-opening valve body (1.7) moves in a pre-opening channel of the valve disc (1.8) and is matched with the water level in the valve disc (1.8) at the pressure relief channel;
a quick-closing valve mounting opening is formed in the volute casing (2), and a flange (1.5) is fixed at the quick-closing valve mounting opening;
the driving device (1.1) is connected and fixed with the flange (1.5) through a connecting pipe (1.2), an upper flange of the connecting pipe (1.2) is fixed with the driving device (1.1), and a lower flange of the connecting pipe (1.2) is fixed with the flange (1.5);
a channel is arranged in the flange (1.5), and the channel in the connecting pipe (1.2) form a valve rod channel with full stroke;
the upper end of the corrugated pipe (1.3) is fixed and sealed with an upper flange (1.5) of the connecting pipe (1.2), and the lower end of the corrugated pipe is welded and fixed with the valve rod (1.4);
and a packing seal is arranged between the valve rod (1.4) and the flange (1.5).
2. The turbine expander volute of claim 1, wherein the volute housing (2) is provided with an inlet temperature measuring port (2.2), an inlet pressure measuring port (2.1), an outlet temperature measuring port (2.4) and an outlet pressure measuring port (2.3), and the temperature measuring port and the pressure measuring port are respectively provided with measuring instruments for measuring the temperature and the pressure of the working medium.
3. The turbine expander volute of claim 1, wherein the bottom of the volute housing (2) is provided with a blow-off hole (2.5).
4. The turbine expander volute of claim 1, wherein the volute housing (2) is provided with a lifting ring (2.6).
5. The turbine expander volute of claim 1, further comprising a PLC or DCS control system that manually or automatically controls and interlocks the quick-shut valve (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811542344.XA CN109404067B (en) | 2018-12-17 | 2018-12-17 | Turbine expander spiral case |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811542344.XA CN109404067B (en) | 2018-12-17 | 2018-12-17 | Turbine expander spiral case |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109404067A CN109404067A (en) | 2019-03-01 |
| CN109404067B true CN109404067B (en) | 2024-03-12 |
Family
ID=65460989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811542344.XA Active CN109404067B (en) | 2018-12-17 | 2018-12-17 | Turbine expander spiral case |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109404067B (en) |
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| US3987818A (en) * | 1975-06-19 | 1976-10-26 | Turbodyne Corporation | Safety trip valve for steam or gas turbines with means to assure controlled opening from the closed position |
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| US3892382A (en) * | 1973-06-22 | 1975-07-01 | Westinghouse Electric Corp | Holding arrangement for a main valve plug and a pilot valve plug |
| US3987818A (en) * | 1975-06-19 | 1976-10-26 | Turbodyne Corporation | Safety trip valve for steam or gas turbines with means to assure controlled opening from the closed position |
| US4679769A (en) * | 1984-07-27 | 1987-07-14 | Westinghouse Electric Corp. | Steam turbine control valve for cyclic duty |
| JPS6362971A (en) * | 1986-09-04 | 1988-03-19 | Toshiba Corp | Steam valve |
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| Publication number | Publication date |
|---|---|
| CN109404067A (en) | 2019-03-01 |
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