CN112696239A - Long blade temperature control system and method for low-pressure cylinder under low-flow working condition - Google Patents
Long blade temperature control system and method for low-pressure cylinder under low-flow working condition Download PDFInfo
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- CN112696239A CN112696239A CN202011449539.7A CN202011449539A CN112696239A CN 112696239 A CN112696239 A CN 112696239A CN 202011449539 A CN202011449539 A CN 202011449539A CN 112696239 A CN112696239 A CN 112696239A
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- 238000000034 method Methods 0.000 title claims description 10
- 238000001816 cooling Methods 0.000 claims abstract description 72
- 230000001105 regulatory effect Effects 0.000 claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 239000000498 cooling water Substances 0.000 claims abstract description 8
- 238000005192 partition Methods 0.000 claims description 23
- 239000000523 sample Substances 0.000 claims description 23
- 239000007921 spray Substances 0.000 claims description 19
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000004891 communication Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 238000007664 blowing Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000004080 punching Methods 0.000 description 1
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
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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
- F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
- F01D19/02—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith dependent on temperature of component parts, e.g. of turbine-casing
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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
- 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
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Abstract
The invention relates to the technical field of steam turbines, in particular to a long blade temperature control system under a low-pressure cylinder low-flow working condition, which comprises: the low pressure cylinder is internally provided with a long blade area temperature measuring point and a water spraying ring; the steam outlet of the intermediate pressure cylinder is communicated with the steam inlet of the low pressure cylinder through a communicating pipeline and a bypass pipeline which are connected in parallel, the communicating pipeline is provided with a steam inlet control valve, and the bypass pipeline is provided with a bypass regulating valve; the cooling pipeline is used for conveying cooling water to the water spraying ring and is provided with a cooling regulating valve; and the temperature measuring point, the steam inlet control valve, the bypass regulating valve and the cooling regulating valve are all connected with the controller. The temperature control system is adopted, and the controller mainly controls the opening and closing of the steam inlet control valve, the bypass regulating valve and the cooling regulating valve and the opening degree according to the temperature measured by the temperature measuring point. The temperature monitoring and control can be carried out on the long blade area of the low-pressure cylinder, and the safe operation of the low-pressure cylinder under the working condition of small flow is ensured.
Description
Technical Field
The invention relates to the technical field of steam turbines, in particular to a long blade temperature control system under a low-pressure cylinder low-flow working condition and a long blade temperature control method under the low-pressure cylinder low-flow working condition.
Background
At present, a large-scale steam turbine set is used for heat supply transformation to replace a small boiler to supply heat to a city, a large number of 300MW-1000MW large-scale straight condensing steam turbine sets are used for heat supply transformation by punching and steam extraction through a middle-low pressure communicating pipe, and a heat supply butterfly valve is additionally arranged at a middle discharge port to adjust steam distribution to a low pressure cylinder and a heat supply initial station. The heat supply unit reduces the flow entering the low pressure cylinder as much as possible by closing the middle discharge butterfly valve, thereby enabling most of the middle pressure cylinder to discharge steam for heat supply and reducing the output of the low pressure cylinder. And part of the units even close the middle discharge butterfly valve completely, and the low-pressure cylinder operates under the working condition of zero output. Under the operating condition, the low-pressure cylinder is operated under the working condition of small flow, the steam inlet flow of the low-pressure cylinder is greatly reduced, backflow and backflow can be formed in two-stage long blade areas at the tail of the low-pressure cylinder, the friction blast heating phenomenon of high-speed operation of a low-pressure cylinder rotor is caused, and the blast heating can cause a series of problems of long blade strength, vibration, dynamic stress and the like. Therefore, certain temperature monitoring and protection are needed to be carried out on the long blade area, and the safety risk caused by long-term operation of the low-pressure cylinder under the working condition of low flow is avoided.
Disclosure of Invention
The invention aims to provide a long blade temperature control system and a long blade temperature control method for a low-pressure cylinder under a low-flow working condition, which can monitor and control the temperature of a long blade area of the low-pressure cylinder and protect the low-pressure cylinder from safely running under the low-flow working condition so as to overcome the defects in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a long blade temperature control system for low-pressure cylinder low-flow conditions comprises: the low-pressure cylinder is internally provided with a temperature measuring point for measuring the temperature of the long blade area of the low-pressure cylinder and a water spraying ring for spraying water to the long blade area of the low-pressure cylinder; the steam outlet of the middle pressure cylinder is communicated with the steam inlet of the low pressure cylinder through a communicating pipeline and a bypass pipeline which are connected in parallel, the communicating pipeline is provided with a steam inlet control valve, and the bypass pipeline is provided with a bypass regulating valve; the cooling pipeline is communicated with the water spray ring and used for conveying cooling water to the water spray ring, and a cooling regulating valve is arranged on the cooling pipeline; and the temperature measuring point, the steam inlet control valve, the bypass regulating valve and the cooling regulating valve are all connected with the controller.
Preferably, there are two temperature measurement points, and the two temperature measurement points are used for measuring the temperature of the next-to-last-stage blade area and the temperature of the last-stage blade area of the low-pressure cylinder respectively.
Preferably, the low pressure cylinder comprises an outer cylinder, an inner cylinder arranged in the outer cylinder and a partition plate arranged in the inner cylinder, and the temperature measuring point comprises a temperature sleeve which sequentially penetrates through the outer cylinder, the inner cylinder and the partition plate and a temperature probe which is arranged in the temperature sleeve and extends out of the inner side of the partition plate.
Preferably, the temperature sleeve comprises an outer section sleeve with two ends respectively connected with the outer cylinder and the inner cylinder and an inner section sleeve with two ends respectively connected with the inner cylinder and the partition plate, the inner cylinder is provided with an installation through hole, the outer section sleeve and the inner section sleeve are both arranged in the installation through hole in a penetrating mode, and a spacing distance is arranged between the outer section sleeve and the inner section sleeve.
Preferably, the temperature sleeve further comprises an adapter, the adapter penetrates through the outer cylinder, and the outer section sleeve is connected with the adapter and forms an axial gap with the adapter; one end of the temperature probe is connected with the adapter, and the other end of the temperature probe extends out of the inner side of the partition plate.
Preferably, the temperature probe is a thermocouple.
Preferably, a bypass stop valve is arranged on the bypass pipeline and connected with the controller.
Preferably, a bypass flowmeter is arranged on the bypass pipeline.
Preferably, the cooling pipeline is provided with a cooling flowmeter.
A long blade temperature control method under a low-pressure cylinder low-flow working condition adopts the long blade temperature control system under the low-pressure cylinder low-flow working condition, and sequentially comprises the following steps: step one, closing a cooling regulating valve, opening a bypass regulating valve, closing a steam inlet control valve, enabling a low-pressure cylinder to operate under a low-flow working condition, measuring the temperature of a long blade area of the low-pressure cylinder by a temperature measuring point and transmitting a measured temperature value signal to a controller, and receiving the temperature value signal by the controller and comparing the received temperature value with a set temperature value; step two, when the temperature value received by the controller reaches a set temperature value, the controller controls the opening degree of the bypass regulating valve to be gradually increased, so that the temperature value received by the controller is lower than the set temperature value until the bypass regulating valve is fully opened; step three, when the temperature value received by the controller is greater than the set temperature value, the controller controls the opening degree of the cooling regulating valve to be gradually increased, so that the temperature value received by the controller is lower than the set temperature value until the cooling regulating valve is fully opened; and step four, when the temperature value received by the controller is greater than the set temperature value, the controller controls the steam inlet control valve to be opened, and then controls the bypass regulating valve and the cooling regulating valve to be closed, so that the low-pressure cylinder exits from the low-flow working condition.
Compared with the prior art, the invention has the remarkable progress that:
the temperature measuring points are arranged in the long blade area of the low-pressure cylinder and are connected into the controller, under the working condition of small flow, the controller controls the opening degrees of the bypass regulating valve and the cooling regulating valve to be gradually increased to full opening according to the temperature of the long blade area of the low-pressure cylinder measured by the temperature measuring points, the increase of cooling steam flow is input into the low-pressure cylinder through the bypass pipeline, and the cooling pipeline conveys cooling water to the water spray ring to spray water to cool the long blade area of the low-pressure cylinder, so that the cooling temperature of the long blade area of the low-pressure cylinder is maintained below a set temperature value, and the running safety of the low-pressure cylinder under the working condition of small flow is protected; when the bypass regulating valve and the cooling regulating valve are both fully opened and the temperature of the long blade area of the low-pressure cylinder is still larger than a set temperature value, the controller controls the steam inlet control valve to be opened first, and then controls the bypass regulating valve and the cooling regulating valve to be closed, so that the low-pressure cylinder exits from a low-flow working condition, and the low-pressure cylinder can be protected from running risks caused by blowing and heating under the low-flow working condition. Therefore, the invention can monitor and control the temperature of the long blade area of the low pressure cylinder, and ensure the safe operation of the low pressure cylinder under the working condition of small flow.
Drawings
FIG. 1 is a schematic structural diagram of a long-blade temperature control system under a low-pressure cylinder low-flow condition according to an embodiment of the invention.
FIG. 2 is a schematic view of an installation structure of a temperature measuring point in a low-pressure cylinder in a long-blade temperature control system under a low-flow working condition of the low-pressure cylinder in an embodiment of the invention.
Fig. 3 is a schematic sectional view of a portion a in fig. 2.
Fig. 4 is a schematic sectional view of the portion B in fig. 2.
Fig. 5 is a schematic sectional view of the portion C in fig. 2.
Wherein the reference numerals are as follows:
1. low pressure cylinder 1-1, outer cylinder
1-2, inner cylinder 1-21 and mounting through hole
1-3, partition board 1-4, rotor
2. Intermediate pressure cylinder 3 and controller
4. Temperature measuring point 4a and penultimate temperature measuring point
4b, final temperature measuring point 41 and temperature sleeve
411. Outer casing 412, inner casing
413. Adapter 4131, first reaming
4132. Second counterbore 42, temperature probe
43. Support 5, water spray ring
6. Steam inlet control valve 7 and bypass regulating valve
8. Bypass stop valve 9, bypass flowmeter
10. Cooling regulating valve 11 and cooling flowmeter
100. Communicating pipe 200, bypass pipe
300. Cooling duct
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Referring to fig. 1 to 5, an embodiment of a long vane temperature control system for low-pressure cylinder low-flow conditions according to the present invention is shown.
Referring to fig. 1, the long blade temperature control system for a low-pressure cylinder in a low-flow condition of the present embodiment includes a low-pressure cylinder 1, an intermediate-pressure cylinder 2, a controller 3, a communication pipe 100, a bypass pipe 200, and a cooling pipe 300.
Wherein, a temperature measuring point 4 and a water spraying ring 5 are arranged in the low-pressure cylinder 1. The temperature measuring point 4 extends into the through-flow area inside the low pressure cylinder 1 and is used for measuring the temperature of the long blade area of the low pressure cylinder 1. Under the working condition of small flow, the temperature of the long blade area of the low pressure cylinder 1 measured by the temperature measuring point 4 can very intuitively represent the blowing heating condition of the long blade area of the low pressure cylinder 1, and the blowing heating phenomenon is more serious when the temperature is higher. The temperature measuring point 4 is connected with the controller 3, the temperature measuring point 4 transmits a measured temperature value signal to the controller 3, and the controller 3 receives the temperature value signal to realize real-time monitoring of the temperature of the long blade area of the low pressure cylinder 1. The water spray ring 5 is arranged in a through-flow area inside the low pressure cylinder 1 and is used for spraying water to a long blade area of the low pressure cylinder 1, so that the long blade area of the low pressure cylinder 1 is cooled by spraying water.
The communicating pipe 100 communicates the steam outlet of the intermediate pressure cylinder 2 with the steam inlet of the low pressure cylinder 1, and the steam outlet of the intermediate pressure cylinder 2 can enter the low pressure cylinder 1 through the communicating pipe 100. The communicating pipeline 100 is provided with the steam inlet control valve 6, the on-off of the communicating pipeline 100 is controlled by opening or closing the steam inlet control valve 6, and the flow in the communicating pipeline 100 can be controlled by adjusting the opening of the steam inlet control valve 6. The steam inlet control valve 6 is connected with the controller 3, and the controller 3 can automatically control the opening and closing of the steam inlet control valve 6 and the adjustment of the opening degree.
The bypass line 200 is connected in parallel to the communication line 100, that is, the bypass line 200 also connects the steam exhaust port of the intermediate pressure cylinder 2 to the steam intake port of the low pressure cylinder 1, and when the steam intake control valve 6 is closed and the communication line 100 is disconnected, the cooling steam of the intermediate pressure cylinder 2 can enter the low pressure cylinder 1 through the bypass line 200, and the cooling steam is also the exhaust steam of the intermediate pressure cylinder 2. The bypass pipeline 200 is provided with a bypass regulating valve 7, the on-off of the bypass pipeline 200 is controlled by opening or closing the bypass regulating valve 7, and the flow in the bypass pipeline 200 can be controlled by regulating the opening of the bypass regulating valve 7. The bypass regulating valve 7 is connected to the controller 3, and the opening, closing, and opening degree adjustment of the bypass regulating valve 7 can be automatically controlled by the controller 3. Preferably, the bypass pipeline 200 may further include a bypass stop valve 8, and the opening and closing of the bypass pipeline 200 is controlled by opening or closing the bypass stop valve 8, so that the opening and closing of the bypass pipeline 200 can be more reliable. The bypass stop valve 8 is connected with the controller 3, and the controller 3 can automatically control the opening and closing of the bypass stop valve 8. Preferably, a bypass flow meter 9 is further disposed on the bypass pipeline 200, and the bypass flow meter 9 is used for measuring the flow rate in the bypass pipeline 200. The bypass flow meter 9 may be connected to the controller 3 so that a measured flow value signal may be fed back to the controller 3.
The pipe diameter of the bypass pipe 200 is smaller than that of the communication pipe 100. When the bypass pipeline 200 is disconnected and the communication pipeline 100 is opened, the exhaust steam of the intermediate pressure cylinder 2 enters the low pressure cylinder 1 through the communication pipeline 100, the exhaust steam flow of the intermediate pressure cylinder 2 conveyed by the communication pipeline 100 is large, and the low pressure cylinder 1 operates under the normal flow working condition. Because the pipe diameter of the communicating pipe 100 is large, even when the opening of the steam inlet control valve 6 on the communicating pipe 100 is adjusted to the minimum opening, the steam flow sent into the low pressure cylinder 1 by the communicating pipe 100 is still large, and the low flow working condition of the low pressure cylinder 1 cannot be realized, therefore, a bypass pipe 200 with a small pipe diameter is connected in parallel on the communicating pipe 100 and is used for greatly reducing the steam inlet amount of the low pressure cylinder 1, and the small flow working condition of the low pressure cylinder 1 can be realized by disconnecting the communicating pipe 100 and opening the bypass pipe 200, and conveying the small flow steam exhaust of the intermediate pressure cylinder 2 to the low pressure cylinder 1 by the bypass pipe 200. The pipe diameter of the bypass pipe 200 and the pipe diameter of the communication pipe 100 are not limited, and may be designed according to actual parameters of the steam turbine set.
The cooling pipe 300 communicates with the water spray ring 5, and the cooling pipe 300 supplies cooling water to the water spray ring 5. The cooling water delivered by the cooling pipe 300 may come from a condensate pump at the outlet of a condenser in the steam turbine system, and the condensate at the outlet of the condenser is pumped to the cooling pipe 300 by the condensate pump, and may be delivered to the water spray ring 5 through the cooling pipe 300. The cooling duct 300 is provided with a cooling regulating valve 10, the on-off of the cooling duct 300 is controlled by opening or closing the cooling regulating valve 10, and the flow rate in the cooling duct 300 can be controlled by adjusting the opening of the cooling regulating valve 10. The cooling control valve 10 is connected to the controller 3, and the opening, closing, and opening degree adjustment of the cooling control valve 10 can be automatically controlled by the controller 3. Preferably, the cooling pipeline 300 may further be provided with a cooling flow meter 11, and the cooling flow meter 11 is used for measuring the flow rate in the cooling pipeline 300. The cooling flow meter 11 may be connected to the controller 3 so that a measured flow value signal may be fed back to the controller 3.
The form of the controller 3 is not limited, and an existing controller, such as a PLC controller or a single chip microcomputer, may be used. In this embodiment, preferably, the controller 3 may adopt a main controller of an existing steam turbine system, that is, the temperature measuring point 4 is connected to the existing main controller of the steam turbine system, and the main controller of the steam turbine system monitors and protects and controls the temperature of the long blade area of the low-pressure cylinder under the low-flow working condition according to a temperature value signal measured by the temperature measuring point 4.
The working principle of the long-blade temperature control system under the low-pressure cylinder low-flow working condition is as follows: when the cooling regulating valve 10 is closed, the steam inlet control valve 6 is closed, and the bypass regulating valve 7 and the bypass stop valve 8 are opened, the low pressure cylinder 1 operates under a small flow working condition; under the working condition of small flow of the low pressure cylinder, the temperature measuring point 4 measures the temperature of the long blade area of the low pressure cylinder 1 and transmits a measured temperature value signal to the controller 3, the controller 3 receives the temperature value signal and compares the received temperature value with a set temperature value, and the set temperature value is the maximum temperature of the long blade area of the low pressure cylinder 1 allowed under the working condition of small flow of the low pressure cylinder 1 set according to the structural parameters of the actual low pressure cylinder 1; when the temperature value received by the controller 3 is greater than the set temperature value, the controller 3 controls the opening degrees of the bypass regulating valve 7 and the cooling regulating valve 10 to be gradually increased to full opening, cooling steam flow is input into the low-pressure cylinder 1 through the bypass pipeline 200, cooling water is conveyed to the water spray ring 5 through the cooling pipeline 300 to spray water to cool the long blade area of the low-pressure cylinder 1, cooling of the long blade area of the low-pressure cylinder 1 is achieved, the temperature of the long blade area of the low-pressure cylinder 1 is maintained below the set temperature value, and the running safety of the low-pressure cylinder 1 under the working condition of low flow is protected; when the bypass regulating valve 7 and the cooling regulating valve 10 are both fully opened and the temperature value received by the controller 3 is still greater than the set temperature value, the controller 3 firstly controls the steam inlet control valve 6 to be opened, and then controls the bypass regulating valve 7, the bypass stop valve 8 and the cooling regulating valve 10 to be closed, so that the low-pressure cylinder 1 is withdrawn from the low-flow working condition, and the low-pressure cylinder 1 is protected from the operation risk caused by the blowing heat of the low-flow working condition. From this, the long blade temperature control system of the low pressure cylinder low discharge operating mode of this embodiment can carry out temperature monitoring and control to the long blade region of low pressure cylinder 1, ensures the safe operation of low pressure cylinder 1 at the low discharge operating mode.
Because the low pressure cylinder 1 forms backflow and backflow mainly in the last two stages of long blade regions of the low pressure cylinder 1 (i.e. the last-stage long blade region and the last-stage long blade region of the low pressure cylinder 1, i.e. the two-stage long blade regions located at the extreme end of the low pressure cylinder 1 along the through-flow direction in the low pressure cylinder 1) under the low flow working condition that the intake flow is greatly reduced, the phenomenon of blast heating is caused, therefore, in the present embodiment, referring to fig. 1, preferably, two temperature measuring points 4 are provided, that is, a next-to-last-stage temperature measuring point 4a and a last-stage temperature measuring point 4b, the next-to-last-stage temperature measuring point 4a extending into the next-to-last-stage long blade region through which the inside of the low pressure cylinder 1 flows, and is used for measuring the temperature of the next-to-last-stage-length-blade region of the low-pressure cylinder 1, and the last-stage-temperature measuring point 4b extends into the last-stage-length-blade region through which the inside of the low-pressure cylinder 1 flows, and is used for measuring the temperature of the last-stage-length-blade region of the low-pressure cylinder 1. Preferably, a water spray ring 5 is also provided in the last two-stage long vane region of the low pressure cylinder 1 for water spray cooling of the last two-stage long vane region of the low pressure cylinder 1. The installation structure of the water spray ring 5 in the low pressure cylinder 1 can adopt a conventional water spray cooling structure in the cylinder in the prior art, which is not described in detail herein.
In the present embodiment, the two temperature measurement points 4 have the same mounting structure in the penultimate blade region and the final-stage blade region of the low pressure cylinder 1. Referring to fig. 2, the low pressure cylinder 1 generally includes an outer cylinder 1-1, an inner cylinder 1-2, a partition plate 1-3 and a rotor 1-4, the inner cylinder 1-2 is disposed in the outer cylinder 1-1, the partition plate 1-3 is disposed in the inner cylinder 1-2, the rotor 1-4 is disposed in the inner cylinder 1-2, a through-flow area is formed between the partition plate 1-3 and the rotor 1-4, and a long blade is disposed in the through-flow area. In this embodiment, the temperature measuring point 4 has a double-layer structure, and specifically includes a temperature sleeve 41 and a temperature probe 42. The temperature sleeve 41 is sequentially arranged in the outer cylinder 1-1, the inner cylinder 1-2 and the partition plate 1-3 of the low pressure cylinder 1 in a penetrating way, and the temperature sleeve 41 extends out of the inner side of the partition plate 1-3 and extends into the long blade area in the through flow of the low pressure cylinder 1. The temperature probe 42 is arranged in the temperature sleeve 41, and the temperature probe 42 also extends out of the inner side of the partition board 1-3 and extends into the long blade area in the through flow of the low pressure cylinder 1, so that the temperature of the long blade area of the low pressure cylinder 1 can be effectively monitored. The temperature probe 42 is connected with the controller 3, and the temperature sleeve 41 protects the temperature probe 42.
Referring to fig. 2 and 3, preferably, the temperature casing 41 is in two-section type, and specifically includes an outer casing 411 and an inner casing 412, two ends of the outer casing 411 are respectively connected to the outer casing 1-1 and the inner casing 1-2 of the low pressure cylinder 1, and two ends of the inner casing 412 are respectively connected to the inner casing 1-2 and the partition 1-3 of the low pressure cylinder 1. The inner cylinder 1-2 of the low pressure cylinder 1 is provided with an installation through hole 1-21, one end of the outer section sleeve 411 connected with the inner cylinder 1-2 and one end of the inner section sleeve 412 connected with the inner cylinder 1-2 are both arranged in the installation through hole 1-21 of the inner cylinder 1-2 in a penetrating mode, and a spacing distance L1 is arranged between the outer section sleeve 411 and the inner section sleeve 412. Referring to fig. 3 and 4, the interior of the outer casing 411 is axially through, the inner casing 412 is in the shape of an inner hollow tube with one end through and the other end sealed, the through end of the inner casing 412 is inserted into the installation through hole 1-21 of the inner cylinder 1-2, the sealed end of the inner casing 412 is inserted into the partition 1-3 and extends out of the inner side of the partition 1-3, the temperature probe 42 is inserted into the outer casing 411 and the inner casing 412, and the end of the temperature probe 42 extending into the inner casing 412 is in contact with the sealed end of the inner casing 412. The temperature sleeve 41 is in two-section type, and a spacing distance L1 is left between the outer section sleeve 411 and the inner section sleeve 412, so that damage to the temperature sleeve 41 caused by inconsistent expansion of the low pressure cylinder 1 and the temperature sleeve 41 can be avoided. The separation distance L1 between the outer casing 411 and the inner casing 412 may be 2mm to 3 mm. In this embodiment, preferably, the outer sleeve 411 may be fixedly connected to the outer side surface of the inner cylinder 1-2 by full-length welding; the inner section sleeve 412 can be fixedly connected with the inner side surface of the inner cylinder 1-2 through full welding; the inner sleeve 412 may be fixedly connected to the inner and outer side surfaces of the partition boards 1-3 by full-length welding. Preferably, the inner section sleeve 412 is also supported on the bulkheads 1-3 by brackets 43 (as shown in FIG. 2). In this embodiment, the length of the inner sleeve 412 extending out of the inner side of the partition boards 1-3 may be 80mm-100 mm. In this embodiment, the inner diameters of the inner spaces of the outer casing 411 and the inner casing 412 are the same, and the inner diameter is the inner diameter of the temperature casing 41, and preferably, the outer diameter of the temperature probe 42 is smaller than the inner diameter of the temperature casing 41, so that a spacing distance L2 (as shown in fig. 4) is provided between the temperature probe 42 and the inner wall of the temperature casing 41, and the spacing distance L2 may be about 1.5 mm.
Referring to fig. 2 and 5, preferably, the temperature sleeve 41 further includes an adapter 413, the adapter 413 is inserted into the outer cylinder 1-1 of the low pressure cylinder 1, the adapter 413 can be fixedly connected to the inner and outer side surfaces of the outer cylinder 1-1 by full welding, the outer sleeve 411 is connected to the adapter 413, so that the outer sleeve 411 is connected to the outer cylinder 1-1, and an axial gap L3 is formed between the outer sleeve 411 and the adapter 413. Referring to fig. 5, the inside of the adapter 413 is axially through, and a first counterbore 4131 is formed inside an end of the adapter 413 located inside the outer cylinder 1-1, an end of the outer sleeve 411 is received in the first counterbore 4131, and an axial gap L3 is formed between an end surface of the outer sleeve 411 and a bottom wall of the first counterbore 4131, and the axial gap L3 can also prevent the temperature sleeve 41 from being damaged due to inconsistent expansion of the low pressure cylinder 1 and the temperature sleeve 41. In this embodiment, the axial gap L3 between the outer sleeve 411 and the adapter 413 may be 2mm to 3 mm. The outer sleeve 411 may be fixedly connected to an end surface of the adapter 413 located inside the outer cylinder 1-1 by full-weld. One end of the temperature probe 42 is connected to the adapter 413, and the other end of the temperature probe 42 passes through the adapter 413 and the outer casing 411, extends into the inner casing 412, contacts with the end of the inner casing 412 at the closed end, and extends out of the inner side of the partition board 1-3 in the inner casing 412. In this embodiment, a second counterbore 4132 is formed in the end of the adapter 413 located outside the outer cylinder 1-1, and the second counterbore 4132 is provided with an internal thread for fixedly connecting with the end of the temperature probe 42, so as to mount the temperature probe 42 in the temperature sleeve 41.
In this embodiment, the temperature probe 42 may be a thermocouple.
Based on the long blade temperature control system under the low-pressure cylinder low-flow working condition, the embodiment also provides a long blade temperature control method under the low-pressure cylinder low-flow working condition. The long blade temperature control method under the low-flow working condition of the low-pressure cylinder of the embodiment adopts the long blade temperature control system under the low-flow working condition of the low-pressure cylinder 1 of the embodiment, and sequentially comprises the following steps.
Step one, the cooling regulating valve 10 is closed, the bypass regulating valve 7 and the bypass stop valve 8 are opened, and the steam inlet control valve 6 is closed, so that the low-pressure cylinder 1 operates under the working condition of low flow. The temperature measuring point 4 measures the temperature of the long blade area of the low pressure cylinder 1 and transmits the measured temperature value signal to the controller 3, and the controller 3 receives the temperature value signal and compares the received temperature value with a set temperature value. In the present embodiment, it is preferable that the temperature measuring points 4 are provided with two, a next-last-stage temperature measuring point 4a and a last-stage temperature measuring point 4b, respectively, the next-last-stage temperature measuring point 4a measures the temperature of the next-last-stage long blade region of the low pressure cylinder 1 and transmits a measured temperature value signal to the controller 3, and the last-stage temperature measuring point 4b measures the temperature of the last-stage long blade region of the low pressure cylinder 1 and transmits a measured temperature value signal to the controller 3. Correspondingly, two set temperature values are set for the last-stage long blade area and the last-stage long blade area respectively, the controller 3 receives a temperature value signal measured by the last-stage temperature measuring point 4a and compares the received temperature value with the set temperature value of the last-stage long blade area, and the controller 3 receives a temperature value signal measured by the last-stage temperature measuring point 4b and compares the received temperature value with the set temperature value of the last-stage long blade area. Therefore, the temperature parameter change of the last two stages of long blade areas of the low-pressure cylinder 1 is monitored in real time.
Step two, on the basis of the step one, when the temperature value received by the controller 3 reaches the set temperature value, specifically, when the temperature value measured by the last stage temperature measuring point 4a received by the controller 3 reaches the set temperature value of the last stage long blade region or the temperature value measured by the last stage temperature measuring point 4b received by the controller 3 reaches the set temperature value of the last stage long blade region, the controller 3 controls the opening degree of the bypass regulating valve 7 to gradually increase, the cooling steam flow is input into the low pressure cylinder 1 through the bypass pipeline 200 to realize the cooling of the long blade region of the low pressure cylinder 1, so that the temperature value received by the controller 3 is lower than the set temperature value, specifically, the temperature value measured by the last stage temperature measuring point 4a received by the controller 3 is lower than the set temperature value of the last stage long blade region and the temperature value measured by the last stage temperature measuring point 4b received by the controller 3 is lower than the, and the low pressure cylinder 1 is kept in the state to operate until the bypass regulating valve 7 is fully opened, so that the operation safety of the low pressure cylinder 1 under the working condition of small flow can be protected.
Step three, on the basis of the step two, namely after the bypass regulating valve 7 is fully opened, when the temperature value received by the controller 3 is greater than the set temperature value, specifically, when the temperature value measured by the penultimate temperature measuring point 4a received by the controller 3 is greater than the set temperature value of the penultimate long blade area or the temperature value measured by the final temperature measuring point 4b received by the controller 3 is greater than the set temperature value of the final long blade area, the controller 3 controls the cooling regulating valve 10 to be opened and controls the opening degree of the cooling regulating valve 10 to be gradually increased, cooling water is conveyed to the water spray ring 5 through the cooling pipeline 300 to spray water to cool the long blade area of the low pressure cylinder 1, so that the long blade area of the low pressure cylinder 1 is further cooled, the temperature value received by the controller 3 is lower than the set temperature value, specifically, the temperature value measured by the penultimate temperature measuring point 4a received by the controller 3 is lower than the set temperature value of the penultimate 4b is lower than the set temperature value of the last-stage long blade area until the cooling regulating valve 10 is fully opened, the low-pressure cylinder 1 is maintained to operate in the state, and the operation safety of the low-pressure cylinder 1 under the working condition of small flow can be protected.
And step four, on the basis of the step three, namely after the bypass regulating valve 7 and the cooling regulating valve 10 are fully opened, after the low-pressure cylinder 1 runs for a long time, when the temperature value received by the controller 3 is greater than the set temperature value, specifically, when the temperature value measured by the penultimate temperature measuring point 4a received by the controller 3 is greater than the set temperature value of the penultimate long blade area or the temperature value measured by the last temperature measuring point 4b received by the controller 3 is greater than the set temperature value of the last long blade area, the controller 3 firstly controls the steam inlet control valve 6 to be opened, so that the exhaust steam of the intermediate pressure cylinder 2 enters the low-pressure cylinder 1 through the communicating pipeline 100, the steam inlet flow of the low-pressure cylinder 1 is increased, then the bypass regulating valve 7 and the cooling regulating valve 10 are controlled to be closed, so that the low-pressure cylinder 1 exits from the low-flow working condition, and the.
Therefore, the long blade temperature control method under the low-flow working condition of the low-pressure cylinder can monitor and control the temperature of the long blade area of the low-pressure cylinder 1, and the safe operation of the low-pressure cylinder 1 under the low-flow working condition is ensured.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a long blade temperature control system of low pressure cylinder low discharge operating mode which characterized in that includes:
the device comprises a low pressure cylinder (1), wherein a temperature measuring point (4) for measuring the temperature of a long blade area of the low pressure cylinder (1) and a water spraying ring (5) for spraying water to the long blade area of the low pressure cylinder (1) are arranged in the low pressure cylinder (1);
the steam exhaust port of the intermediate pressure cylinder (2) is communicated with the steam inlet port of the low pressure cylinder (1) through a communicating pipeline (100) and a bypass pipeline (200) which are connected in parallel, a steam inlet control valve (6) is arranged on the communicating pipeline (100), and a bypass regulating valve (7) is arranged on the bypass pipeline (200);
the cooling pipeline (300) is communicated with the water spray ring (5) and conveys cooling water to the water spray ring (5), and a cooling regulating valve (10) is arranged on the cooling pipeline (300); and
and the controller (3), the temperature measuring point (4), the steam inlet control valve (6), the bypass regulating valve (7) and the cooling regulating valve (10) are all connected with the controller (3).
2. The long blade temperature control system under the low-pressure cylinder low-flow working condition as claimed in claim 1, wherein there are two temperature measuring points (4), and the two temperature measuring points (4) are respectively used for measuring the temperature of the last long blade area and the temperature of the second long blade area of the low-pressure cylinder (1).
3. The long-blade temperature control system under the low-pressure cylinder low-flow working condition as claimed in claim 1 or 2, wherein the low-pressure cylinder (1) comprises an outer cylinder (1-1), an inner cylinder (1-2) arranged in the outer cylinder (1-1) and a partition plate (1-3) arranged in the inner cylinder (1-2), and the temperature measuring point (4) comprises a temperature sleeve (41) arranged in the outer cylinder (1-1), the inner cylinder (1-2) and the partition plate (1-3) in a penetrating manner in sequence and a temperature probe (42) arranged in the temperature sleeve (41) and extending out of the inner side of the partition plate (1-3).
4. The long-blade temperature control system under the low-pressure cylinder low-flow working condition as claimed in claim 3, wherein the temperature sleeve (41) comprises an outer section sleeve (411) and an inner section sleeve (412), the two ends of the outer section sleeve are respectively connected with the outer cylinder (1-1) and the inner cylinder (1-2), the two ends of the inner section sleeve are respectively connected with the inner cylinder (1-2) and the partition plate (1-3), the inner cylinder (1-2) is provided with a mounting through hole (1-21), the outer section sleeve (411) and the inner section sleeve (412) are both arranged in the mounting through hole (1-21), and a spacing distance is reserved between the outer section sleeve (411) and the inner section sleeve (412).
5. The long-blade temperature control system under the low-pressure-cylinder low-flow condition of claim 4, wherein the temperature sleeve (41) further comprises an adapter (413), the adapter (413) is arranged in the outer cylinder (1-1) in a penetrating manner, and the outer-section sleeve (411) is connected with the adapter (413) and forms an axial gap with the adapter (413); one end of the temperature probe (42) is connected with the adapter (413), and the other end of the temperature probe extends out of the inner side of the partition board (1-3).
6. The long vane temperature control system for low cylinder low flow conditions of claim 4 wherein the temperature probe (42) is a thermocouple.
7. The long-blade temperature control system under the low-pressure cylinder low-flow working condition as claimed in claim 1, wherein a bypass stop valve (8) is arranged on the bypass pipeline (200), and the bypass stop valve (8) is connected with the controller (3).
8. The long-blade temperature control system under the low-pressure cylinder low-flow working condition as claimed in claim 1, wherein a bypass flowmeter (9) is arranged on the bypass pipeline (200).
9. The long-blade temperature control system under the low-pressure cylinder low-flow working condition of claim 1, wherein a cooling flow meter (11) is arranged on the cooling pipeline (300).
10. A long blade temperature control method under a low-pressure cylinder low-flow working condition, which is characterized in that the long blade temperature control system under the low-pressure cylinder low-flow working condition as claimed in any one of claims 1 to 9 is adopted, and the method sequentially comprises the following steps:
step one, closing the cooling regulating valve (10), opening the bypass regulating valve (7), closing the steam inlet control valve (6) to enable the low-pressure cylinder (1) to operate under a low-flow working condition, measuring the temperature of a long blade area of the low-pressure cylinder (1) by the temperature measuring point (4) and transmitting a measured temperature value signal to the controller (3), and receiving the temperature value signal by the controller (3) and comparing the received temperature value with a set temperature value;
step two, when the temperature value received by the controller (3) reaches the set temperature value, the controller (3) controls the opening degree of the bypass regulating valve (7) to be gradually increased, so that the temperature value received by the controller (3) is lower than the set temperature value until the bypass regulating valve (7) is fully opened;
step three, when the temperature value received by the controller (3) is greater than the set temperature value, the controller (3) controls the opening degree of the cooling regulating valve (10) to be gradually increased, so that the temperature value received by the controller (3) is lower than the set temperature value until the cooling regulating valve (10) is fully opened;
and step four, when the temperature value received by the controller (3) is greater than the set temperature value, the controller (3) controls the steam inlet control valve (6) to be opened firstly, and then controls the bypass regulating valve (7) and the cooling regulating valve (10) to be closed, so that the low-pressure cylinder (1) exits from the low-flow working condition.
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| CN202011449539.7A CN112696239A (en) | 2020-12-09 | 2020-12-09 | Long blade temperature control system and method for low-pressure cylinder under low-flow working condition |
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| CN202011449539.7A CN112696239A (en) | 2020-12-09 | 2020-12-09 | Long blade temperature control system and method for low-pressure cylinder under low-flow working condition |
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Application publication date: 20210423 |