CN108223029B - Temperature control system and method for exhaust cylinder of steam turbine - Google Patents
Temperature control system and method for exhaust cylinder of steam turbine Download PDFInfo
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- CN108223029B CN108223029B CN201711431994.2A CN201711431994A CN108223029B CN 108223029 B CN108223029 B CN 108223029B CN 201711431994 A CN201711431994 A CN 201711431994A CN 108223029 B CN108223029 B CN 108223029B
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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
- 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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- 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
Abstract
The invention discloses a temperature control system of a steam turbine exhaust casing and a control method thereof. When the turbine operates at ultra-low load, the temperature control system takes the condensed water as a temperature-reducing water spraying water source, the opening of a temperature-reducing water spraying main adjusting valve is adjusted by a water spraying temperature-reducing main controller according to the temperature measured by the steam exhaust temperature detecting device, and cooling water is sprayed into a low-pressure cylinder inlet flow passage by the temperature-reducing water spraying device to realize the effect of reducing the steam exhaust temperature. Compared with the traditional low-pressure exhaust cylinder water spray temperature reduction system, the invention realizes the closed-loop control of the temperature reduction water spray quantity, avoids the water erosion of the root part of the last-stage blade of the traditional water spray temperature reduction device caused by the backflow of the temperature reduction water spray to the last stage of the low-pressure cylinder, and ensures the reliability and the safety of the steam turbine during the low-load operation while reducing the temperature of the low-pressure exhaust cylinder.
Description
Technical Field
The invention relates to ultralow load operation of a steam turbine, in particular to a temperature control system of a steam turbine exhaust casing and a control method thereof.
Background
The steam turbine is a rotating machine which takes steam as a working medium and converts steam heat energy into mechanical work. Most of the discharged steam of the condensing steam turbine enters a wet steam area, and water drops generated by the spontaneous condensation of the steam in a low-pressure cylinder can absorb blast friction heat generated by high-speed rotation of a rotor and dynamic and static friction in the cylinder. Meanwhile, for a large reheating unit, the steam turbine works in different states along with different power requirements and parameter requirements, when the steam turbine deviates from the design working condition for a long time, namely when the steam turbine runs at a rated rotating speed low load or an idle load, the temperature after reheating basically keeps unchanged, so that the exhausted steam of the steam turbine enters a superheat area, the capacity of absorbing the heat of the blast air is greatly reduced, and the exhausted steam temperature is quickly increased due to small specific heat of steam. As shown in FIG. 3, the expansion line of the low pressure cylinder is A when the low pressure cylinder is operated at the rated working condition1C1The exhaust steam enters a wet steam area; when the unit operates at low load, the exhaust pressure of the intermediate pressure cylinder is reduced, the exhaust temperature is basically unchanged, and the expansion line of the low pressure cylinder is A2C2And the steam enters a superheat area, and the exhaust steam temperature is increased. The temperature of the exhaust cylinder of the unit rises, which causes the conditions of thermal deformation, negative expansion difference, unit vibration deterioration and the like, and endangers the safe operation of the unit. For this purpose, appropriate measures must be taken to reduce the exhaust-gas temperature.
At present, a water spray attemperator is arranged between an exhaust cylinder and a condenser of a large-scale unit, and a low-pressure cylinder is used for spraying water when the exhaust temperature is higher than a set value. The water spraying source is from condensed water discharged by the low-pressure cylinder and is led out from an outlet of the condensed water pump. Although the temperature of the exhaust cylinder can be reduced by using the water spraying temperature reducing device, when the last stage of the low-pressure cylinder works under the working condition of small volume flow, negative reaction degree is possibly generated in the root area and airflow separation and backflow are caused, backflow steam can bring the sprayed temperature reducing water of the exhaust cylinder into the movable blade grid and impact the outlet edge of the suction surface at the root of the movable blade at high speed, so that water erosion is generated at the outlet edge, and because the root edge of the movable blade bears large static stress and dynamic stress, a crack can be initiated and rapidly expanded towards a water erosion gap by the level of the tail edge; secondly, the zigzag burrs formed by the water erosion of the last stage blade of the steam turbine can cause stress concentration and reduce the area of the section of the blade root, influence the vibration characteristic of the blade, greatly reduce the strength of the blade, deteriorate the pneumatic performance of a blade cascade, reduce the stage efficiency, and cause the fracture and the damage of the blade to cause severe accidents such as strong vibration of a unit and the like in severe cases. Therefore, the erosion and crack initiation of the root of the rotor blade pose a great threat to the safety of the unit.
Because the traditional low-pressure steam exhaust cylinder water spray cooling system has poor controllability, the temperature reduction water spray backflow is easily caused to aggravate the water erosion of the last-stage blade, the running safety of a unit is influenced, and a better steam exhaust cylinder cooling method and system are designed, so that the system has important significance for the stable running of the unit under the ultra-low load and the start-stop working condition.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a temperature control system of a steam turbine exhaust casing and a control method thereof, aiming at preventing the root of the last-stage blade of a low-pressure cylinder from water erosion while realizing the cooling of the exhaust casing temperature under the ultra-low load and start-stop working conditions of the steam turbine.
In order to solve the problems of the prior art, the invention adopts the technical scheme that:
a temperature control system of a steam turbine exhaust cylinder comprises a medium pressure cylinder, a low pressure exhaust cylinder, a condenser heat sink, a condensed water pump set, a temperature-reducing water-spraying regulating valve set, an exhaust temperature detection device, a water-spraying temperature-reducing main controller, a temperature-reducing water-spraying device and a low pressure cylinder inlet runner; the low-pressure cylinder, the low-pressure exhaust cylinder, the condenser and the condenser hot well are arranged according to positions from top to bottom, the exhaust temperature detection device is located on the cylinder wall of the low-pressure exhaust cylinder, the condenser is connected with a condensate pump set through a pipeline, the condensate pump set comprises a condensate pump A, a condensate pump B and a condensate pump C which are connected in parallel, the other end of the condensate pump set is connected with a temperature-reducing water spraying adjusting valve set, the temperature-reducing water spraying adjusting valve set comprises a temperature-reducing water spraying main adjusting valve, a temperature-reducing water spraying main adjusting valve front isolating valve, a temperature-reducing water spraying main adjusting valve rear isolating valve and a temperature-reducing water spraying emergency water spraying stop valve, the temperature-reducing water spraying main adjusting valve rear isolating valve, the temperature-reducing water spraying main adjusting valve and a temperature-reducing water spraying main adjusting valve front isolating valve are sequentially arranged in series and then are connected in parallel to form the temperature-reducing water spraying adjusting valve set, and the temperature-reducing water spraying main adjusting valve front isolating valve and the temperature-reducing water spraying main adjusting valve rear isolating valve rear Normally open, the isolation valve before the main regulating valve of the temperature reduction water spray and behind the main regulating valve of the temperature reduction water spray keeps closing before the main regulating valve of the temperature reduction water spray is pulled down and is maintained, the other end of the adjusting valve group of the temperature reduction water spray is communicated with the temperature reduction water spray device through a pipeline, the temperature reduction water spray device is positioned in the inlet runner of the low-pressure cylinder, and the main regulating valve of the temperature reduction water spray is controlled by the main water spray temperature reduction controller.
The improvement is that the temperature-reducing water spraying device consists of 4 spray heads.
In a further improvement, the insides of the 4 spray heads are spiral.
As an improvement, a filter screen is arranged between the temperature-reducing water spraying regulating valve group and the temperature-reducing water spraying device.
According to the control method of the temperature control system of the exhaust cylinder of the steam turbine, when the low-pressure cylinder runs at ultralow load, steam enters a main condensation area of the condenser through the low-pressure exhaust cylinder, condensed water is boosted through a condensate pump to serve as a spraying water source for the temperature-reducing water spraying device, the low-pressure exhaust cylinder is cooled, the temperature of the low-pressure cylinder is detected by an exhaust temperature detection device in real time, and the opening of a main temperature-reducing water spraying adjusting valve is controlled by a main water spraying and temperature-reducing controller to adjust the water quantity of the temperature-reducing water spraying device; when the main temperature-reducing water-spraying regulating valve fails, the emergency water-spraying stop valve for temperature reduction is manually opened to reduce the temperature of the low-pressure exhaust cylinder.
The improvement is that when the exhaust temperature of the low-pressure cylinder rises and approaches to 60 ℃, the main temperature-reducing water-spraying regulating valve starts to act, water is sprayed into the low-pressure cylinder to reduce the temperature, and the temperature of the low-pressure cylinder is reduced; when the exhaust temperature of the low-pressure cylinder is higher than 80 ℃, the main temperature-reducing water-spraying regulating valve is kept fully open, and when the exhaust temperature of the low-pressure cylinder is reduced and approaches to 60 ℃, the main temperature-reducing water-spraying regulating valve is closed.
Has the advantages that:
compared with the prior art, the invention has the following advantages:
1. the water spray temperature reduction system effectively reduces the temperature of the exhaust cylinder of the steam turbine, can consume the blast friction loss of the last stages of the low-pressure cylinder of the steam turbine when being put into operation under the low-load working condition, reduces the temperature of the exhaust cylinder, prevents the over-limit vibration and the like of the overall expansion difference of the steam turbine caused by the abnormal rise of the exhaust temperature, and improves the safety and the reliability of the operation of the steam turbine under the low-load and starting working conditions;
2. according to the water spraying and temperature reducing system, the temperature reducing and water spraying device is arranged in the inlet flow channel of the low-pressure cylinder, and compared with the traditional rear cylinder water spraying and temperature reducing device, water erosion at the root of the last-stage movable blade of the low-pressure cylinder caused by water spraying backflow is avoided, and potential safety hazards existing in the low-load water spraying and temperature reducing system are eliminated;
3. the temperature of the exhaust steam cylinder is detected in real time by using the exhaust steam temperature detection device, the opening degree of the main temperature-reducing water-spraying regulating valve in the temperature-reducing water-spraying regulating valve group is controlled by the controller, the water spraying quantity is regulated, the operation is simple and convenient, and the working requirement of the steam turbine under the ultra-low load can be met;
4. the water spraying and temperature reducing system is simple, a closed-loop control loop is constructed, a new cold source is not needed, the manufacturing cost is low, the adjustment is flexible, the yield is high, the deep peak regulation capability and the operation safety and reliability of the unit are improved, and the effect is more obvious particularly on a secondary reheating unit.
Drawings
FIG. 1 is a schematic structural diagram of a temperature control system of a steam turbine exhaust steam cylinder, wherein 000-intermediate pressure cylinder, 100-low pressure cylinder, 110-low pressure exhaust steam cylinder, 120-low pressure cylinder inlet runner, 200-condenser main condensation zone, 211-circulating cooling water inlet water chamber, 212-circulating cooling water outlet water chamber, 220-condenser heat trap, 301-condensate pump A, 302-condensate pump B, 303-condensate pump C, 410-shaft seal heater, 420- #1 low pressure heater, 510-main attemperation water spray regulating valve, 521-front attemperation water spray regulating valve isolating valve, 522-rear isolating valve of main attemperation water spray regulating valve, 530-emergency stop valve for temperature spraying, 600-steam turbine exhaust steam temperature detection device, 700-filter screen, 800-main attemperation water spray temperature reducing controller, 900-spray head;
FIG. 2 is a control flow diagram of a temperature control system for a steam turbine exhaust casing according to the present invention;
fig. 3 is a schematic diagram of the operation of a temperature control system for a steam turbine exhaust casing according to the present invention.
Detailed Description
The present invention will be described in further detail below with reference to specific examples.
Example 1
A temperature control system of a steam turbine exhaust cylinder comprises a medium pressure cylinder 000, a low pressure cylinder 100, a low pressure exhaust cylinder 110, a condenser hot well 220, a condensed water pump group, a heater group, a temperature-reducing water-spraying regulating valve group, an exhaust temperature detection device 600, a water-spraying temperature-reducing main controller 800, a temperature-reducing water-spraying device and a low pressure cylinder inlet runner 120; the low-pressure cylinder 100, the low-pressure exhaust cylinder 110, the condenser and the condenser heat sink 220 are arranged from top to bottom, the exhaust steam temperature detection device 600 is located on the cylinder wall of the low-pressure exhaust cylinder 110, the condenser is connected with a condensate pump group through a pipeline, the condensate pump group comprises a condensate pump A301, a condensate pump B302 and a condensate pump C303 which are connected in parallel, the other end of an outlet of the condensate pump group is connected with a heater group, the other end of the outlet of the condensate pump group is connected with a temperature-reducing water-spraying regulating valve group, the heater group is formed by serially connecting a shaft seal heater 410 and a #1 low-pressure heater 420, the temperature-reducing water-spraying regulating valve group comprises a temperature-reducing water-spraying main regulating valve 510, a temperature-reducing water-spraying main regulating valve front isolating valve 521, a temperature-reducing water-spraying main regulating valve rear isolating valve 522 and a temperature-reducing water-spraying emergency water-spraying stop valve 530, the temperature-reducing, The front isolation valves 521 of the main attemperation water spraying regulating valve are sequentially arranged in series and then connected in parallel with the emergency attemperation water spraying stop valve 530 to form an attemperation water spraying regulating valve group, the front isolation valves 521 of the main attemperation water spraying regulating valve and the rear isolation valves 522 of the main attemperation water spraying regulating valve are normally open during normal operation, the front isolation valves 521 of the main attemperation water spraying regulating valve and the rear isolation valves 522 of the main attemperation water spraying regulating valve are kept closed before the main attemperation water spraying regulating valve 510 is detached for maintenance, the other end of the main attemperation water spraying regulating valve group is communicated with an attemperation water spraying device through a pipeline, the attemperation water spraying device is located in an inlet runner 120 of a low-temperature cylinder, and the main attemperation water spraying regulating valve 510 is controlled to be opened and closed. The temperature-reducing water spraying device is composed of 4 spray heads 900, the 4 spray heads 900 are spiral, a filter screen 700 is arranged between the temperature-reducing water spraying adjusting valve group and the temperature-reducing water spraying device, and impurities in water are effectively removed.
Example 2
A control method of a temperature control system of a steam turbine exhaust casing is performed as shown in a mode shown in FIG. 2. When the low-pressure cylinder operates at ultra-low load, steam enters a condenser main condensation area of a condenser through a low-pressure exhaust cylinder, circulating cooling water enters a water chamber at a circulating cooling water inlet, water exits from a water chamber at a circulating cooling water outlet, the steam is changed into condensed water after condensation, and the condensed water is boosted through a condensed water pump set to serve as a spraying water source for the temperature-reducing water spraying device, so that the low-pressure exhaust cylinder is cooled, a steam exhaust temperature detection device detects the temperature of the low-pressure cylinder in real time, and the opening of a main temperature-reducing water spraying adjusting valve is controlled through a main water spraying temperature-reducing controller to realize the water quantity of the; when the main temperature-reducing water-spraying regulating valve fails, the emergency water-spraying stop valve for temperature reduction is manually opened to reduce the temperature of the low-pressure cylinder. When the exhaust steam temperature of the low-pressure cylinder rises and approaches to 60 ℃, the main temperature-reducing water-spraying regulating valve starts to act, water is sprayed into the low-pressure cylinder to reduce the temperature, and the temperature of the low-pressure cylinder is reduced; when the exhaust temperature of the low-pressure cylinder is higher than 80 ℃, the main temperature-reducing water-spraying regulating valve is kept fully open, and when the exhaust temperature of the low-pressure cylinder is reduced and approaches to 60 ℃, the main temperature-reducing water-spraying regulating valve is closed.
Example 3
A working principle diagram of a temperature control system of a steam turbine exhaust casing is shown in FIG. 3, and comprises an inlet isobaric line of a low-pressure cylinder under rated working conditionp 0 Inlet isobaric line for ultralow load low pressure cylinderp 0 ＇ Low pressure cylinder exhaust isobarp 2 Equal temperature line of low pressure cylinder inlet before water spraying and temperature reductiont 0 Low pressure cylinder exhaust isotherm before water spray desuperheating under rated working conditiont 1 And the inlet of the low-pressure cylinder is isothermally cooled after water sprayingt 0 ＇ Low pressure cylinder exhaust isotherm before ultra-low load water spray desuperheatingt 1 ＇ Ideal expansion line A of low-pressure cylinder before water spraying and temperature reduction under rated working condition1B1Actual expansion line A of low-pressure cylinder before water spraying and temperature reduction under rated working condition1C1Ideal expansion line A of low-pressure cylinder before ultra-low load water spray cooling2B2Actual expansion line A of low-pressure cylinder before ultralow-load water spraying and temperature reduction2C2Ideal expansion of low-pressure cylinder after ultralow-load water spraying and temperature reductionExpansion line A3B3Actual expansion line A of low-pressure cylinder after ultralow-load water spraying and temperature reduction3C3And a saturated steam line.
When the steam turbine operates in a low-flow working condition, steam expands in the low-pressure cylinder to do work as shown in figure 3, and the constant-pressure line at the inlet of the low-pressure cylinderp 0 ＇ Isotherm with the inlet of the low pressure cylinder before water spray desuperheatingt 0 The intersection point of the water spray and the temperature reduction is an inlet point A of the low-pressure cylinder before the water spray and the temperature reduction2Ideally steam flow point A2Expands to point B2The exhaust isobar of the low-pressure cylinder isp 2 Because the actual steam has irreversible loss in the process of expansion work of the turbine blade, the actual steam passes through the point A2Expands to point C2Namely the intersection point of the low-pressure cylinder exhaust isobar and the low-pressure cylinder exhaust isotherm before the temperature reduction water spray, and the exhaust temperature ist 1 ＇ 。
Due to the fact that the blast friction loss of the moving and static parts of the final stage of the low-pressure cylinder under the low-flow working condition is increased, the steam exhaust point of the low-pressure cylinder is located above a saturated steam line, the exhaust steam is already in a superheated steam area, heat generated by the blast friction loss cannot be consumed, and the condition that the exhaust steam temperature of the low-pressure cylinder is increased tends to be worsened. The temperature-reducing water spray is sprayed at the inlet of the low-pressure cylinder, the steam temperature at the inlet of the low-pressure cylinder can be rapidly reduced due to the small specific heat of the steam, and the steam is sprayed before temperature reductiont 0 Down tot 0 ＇ The entry point of the low pressure cylinder being defined by point A2Moving down to point A along the inlet isobar of the low pressure cylinder3The steam is delivered to an isothermal line at the inlet of the low-pressure cylinder after water spraying and temperature reduction, and the steam passes through a point A under an ideal condition3Expands to point B3Back pressure ofp 2 If the amount of the water sprayed during the temperature reduction is appropriate, the efficiency of the front and rear stage groups for spraying water during the temperature reduction does not change greatly, and the actual steam expansion line can be defined as A2C2Is translated to A along the inlet isobaric line and the exhaust isobaric line of the low-pressure cylinder3C3As shown by the dotted line in FIG. 3, the steam discharging point after spraying water and reducing temperature is C2Move to C3Exhaust temperature of low pressure cylindert 1 ＇ Is reduced tot 1 ＂ The steam discharging point is positioned below the saturated steam line, the steam humidity of the last stage of the low-pressure cylinder is increased, and the latent heat of vaporization of the wet steam can absorb most of heat generated by blast friction, so that the low-pressure cylinder steam discharging temperature is reduced.
Because the inlet temperature of the low-pressure cylinder of the secondary reheating unit is higher, and the exhaust superheat degree is higher when the design working condition is deviated, the optimization of the secondary reheating unit is more obvious, the optimization effect mainly shows that the inlet temperature of the low-pressure cylinder is rapidly reduced, the exhaust humidity of the low-pressure cylinder is increased, the heat capacity of absorbing blast friction loss is enhanced, but the temperature-reducing water injection quantity is kept in a reasonable range, otherwise, the wet steam loss of the low-pressure cylinder is increased, and the efficiency of the low-pressure cylinder is reduced.
Compared with the traditional low-pressure exhaust cylinder water spray temperature reduction system, the invention realizes the closed-loop control of the temperature reduction water spray quantity, avoids the water erosion of the root part of the last-stage blade of the traditional water spray temperature reduction device caused by the backflow of the temperature reduction water spray to the last stage of the low-pressure cylinder, and ensures the reliability and the safety of the steam turbine during the low-load operation while reducing the temperature of the low-pressure exhaust cylinder.
In addition, the present invention is not limited to the above embodiments, and may be implemented in various ways without departing from the scope of the invention.
Claims (6)
1. A temperature control system of a steam turbine exhaust cylinder is characterized by comprising a medium pressure cylinder, a low pressure exhaust cylinder, a condenser hot well, a condensed water pump set, a temperature-reducing water-spraying regulating valve set, an exhaust steam temperature detection device, a water-spraying temperature-reducing main controller, a temperature-reducing water-spraying device and a low pressure cylinder inlet runner; the low-pressure cylinder, the low-pressure exhaust cylinder, the condenser and the condenser hot well are arranged according to positions from top to bottom, the exhaust temperature detection device is located on the cylinder wall of the low-pressure exhaust cylinder, the condenser is connected with a condensate pump set through a pipeline, the condensate pump set comprises a condensate pump A, a condensate pump B and a condensate pump C which are connected in parallel, the other end of the condensate pump set is connected with a temperature-reducing water spraying adjusting valve set, the temperature-reducing water spraying adjusting valve set comprises a temperature-reducing water spraying main adjusting valve, a temperature-reducing water spraying main adjusting valve front isolating valve, a temperature-reducing water spraying main adjusting valve rear isolating valve and a temperature-reducing water spraying emergency water spraying stop valve, the temperature-reducing water spraying main adjusting valve rear isolating valve, the temperature-reducing water spraying main adjusting valve and a temperature-reducing water spraying main adjusting valve front isolating valve are sequentially arranged in series and then are connected in parallel to form the temperature-reducing water spraying adjusting valve set, and the temperature-reducing water spraying main adjusting valve front isolating valve and the temperature-reducing water spraying main adjusting valve rear isolating valve rear Normally open, the isolation valve before the main regulating valve of the temperature reduction water spray and the isolation valve behind the main regulating valve of the temperature reduction water spray keep closing when the main regulating valve of the temperature reduction water spray is pulled down for maintenance, the other end of the regulating valve group of the temperature reduction water spray is communicated with the temperature reduction water spray device through a pipeline, the temperature reduction water spray device is positioned in the inlet runner of the low-pressure cylinder, and the main regulating valve of the temperature reduction water spray is controlled by the main water spray temperature reduction controller.
2. The system of claim 1 wherein said desuperheating water injection means comprises 4 spray nozzles.
3. The system of claim 2 wherein said 4 nozzles are helical in shape.
4. The system of claim 1, wherein a screen is disposed between the desuperheating water injection regulating valve set and the desuperheating water injection device.
5. The control method of the steam turbine exhaust casing temperature control system based on claim 1 is characterized in that when the low-pressure cylinder runs at ultra-low load, steam enters a main condensation area of a condenser through the low-pressure exhaust casing, condensed condensate water is boosted through a condensate pump to serve as a spraying water source for the temperature-reducing water spraying device, the low-pressure exhaust casing is cooled, a steam exhaust temperature detection device detects the temperature of the low-pressure cylinder in real time, and the opening of a main temperature-reducing water spraying adjusting valve is controlled through a main water spraying temperature-reducing controller to adjust the water quantity of the temperature-reducing water spraying device; when the main temperature-reducing water-spraying regulating valve fails, the emergency water-spraying stop valve for temperature reduction is manually opened to reduce the temperature of the low-pressure exhaust cylinder.
6. The method of claim 5, wherein when the exhaust temperature of the low pressure cylinder rises and approaches 60 ℃, the main attemperation valve starts to operate, and attemperation water is injected to the inlet of the low pressure cylinder to lower the exhaust temperature of the low pressure cylinder; when the exhaust temperature of the low-pressure cylinder is higher than 80 ℃, the main temperature-reducing water-spraying regulating valve is kept fully open, and when the exhaust temperature of the low-pressure cylinder is reduced and approaches to 60 ℃, the main temperature-reducing water-spraying regulating valve is closed.
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| CN201711431994.2A CN108223029B (en) | 2017-12-26 | 2017-12-26 | Temperature control system and method for exhaust cylinder of steam turbine |
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| CN201711431994.2A CN108223029B (en) | 2017-12-26 | 2017-12-26 | Temperature control system and method for exhaust cylinder of steam turbine |
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| CN109736904B (en) * | 2019-03-08 | 2024-02-27 | 张黎明 | Temperature control system and method for eliminating expansion difference and deformation of low-pressure cylinder |
| CN113027546B (en) * | 2021-03-29 | 2022-08-02 | 西安热工研究院有限公司 | Low-pressure cylinder zero-output cooling effect evaluation method suitable for wet-cooling 300MW unit |
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| JPS59208106A (en) * | 1983-05-13 | 1984-11-26 | Toshiba Corp | Exhaust chamber temperature control device of steam turbine |
| JPH07253006A (en) * | 1994-03-15 | 1995-10-03 | Fuji Electric Co Ltd | Exhaust water injection spray controller of steam turbine |
| JPH10252417A (en) * | 1997-03-14 | 1998-09-22 | Toshiba Eng Co Ltd | Protection device of steam turbine exhaust hood |
| CN2613593Y (en) * | 2003-04-10 | 2004-04-28 | 江苏省电力公司常州供电公司 | Spray circulation cooling device for discharge cylinder of steam turbine |
| CN200955409Y (en) * | 2006-07-28 | 2007-10-03 | 中信重型机械公司 | Water-sprinkling device for cooling air-exhaust cylinder |
| CN104533650A (en) * | 2014-12-29 | 2015-04-22 | 东方电气集团东方汽轮机有限公司 | Water spry cooling method and system of low-pressure exhaust hood of air-cooling steam turbine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10253653B2 (en) * | 2014-12-16 | 2019-04-09 | Kabushiki Kaisha Toshiba | Exhaust chamber cooling apparatus and steam turbine power generating facility |
| US10316697B2 (en) * | 2015-06-05 | 2019-06-11 | Kabushiki Kaisha Toshiba | Steam turbine exhaust chamber cooling device and steam turbine |
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2017
- 2017-12-26 CN CN201711431994.2A patent/CN108223029B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59208106A (en) * | 1983-05-13 | 1984-11-26 | Toshiba Corp | Exhaust chamber temperature control device of steam turbine |
| JPH07253006A (en) * | 1994-03-15 | 1995-10-03 | Fuji Electric Co Ltd | Exhaust water injection spray controller of steam turbine |
| JPH10252417A (en) * | 1997-03-14 | 1998-09-22 | Toshiba Eng Co Ltd | Protection device of steam turbine exhaust hood |
| CN2613593Y (en) * | 2003-04-10 | 2004-04-28 | 江苏省电力公司常州供电公司 | Spray circulation cooling device for discharge cylinder of steam turbine |
| CN200955409Y (en) * | 2006-07-28 | 2007-10-03 | 中信重型机械公司 | Water-sprinkling device for cooling air-exhaust cylinder |
| CN104533650A (en) * | 2014-12-29 | 2015-04-22 | 东方电气集团东方汽轮机有限公司 | Water spry cooling method and system of low-pressure exhaust hood of air-cooling steam turbine |
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