CN111927569A - Steam turbine system and method for improving flexibility of heat supply unit - Google Patents
Steam turbine system and method for improving flexibility of heat supply unit Download PDFInfo
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- CN111927569A CN111927569A CN202010898931.3A CN202010898931A CN111927569A CN 111927569 A CN111927569 A CN 111927569A CN 202010898931 A CN202010898931 A CN 202010898931A CN 111927569 A CN111927569 A CN 111927569A
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 24
- 230000033228 biological regulation Effects 0.000 claims abstract description 19
- 238000005520 cutting process Methods 0.000 claims abstract description 9
- 238000002955 isolation Methods 0.000 claims description 29
- 230000001965 increasing effect Effects 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000003628 erosive effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 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
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F01D13/00—Combinations of two or more machines or engines
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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
- F01D13/00—Combinations of two or more machines or engines
- F01D13/02—Working-fluid interconnection of machines or engines
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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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/44—Use of steam for feed-water heating and another purpose
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Turbines (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a steam turbine system and a method for improving the flexibility of a heat supply unit. And a heat supply regulating valve is arranged on the middle and low pressure communicating pipes to assist in steam supply parameter regulation, and an isolating valve is arranged on a steam inlet pipeline of the low pressure cylinder of the steam turbine to assist in cutting off the low pressure cylinder of the steam turbine. And in the heat supply period, the first low-pressure cylinder and the second low-pressure cylinder of the turbine can be cut off on line according to the peak regulation requirement of the power grid. The rotor of the low-pressure cylinder of the steam turbine can be completely separated from the generator, temperature reduction and cooling are not needed, and the risk of blade damage caused by small steam inlet amount of the low-pressure cylinder of the steam turbine is eliminated. One or all low-pressure cylinders of the steam turbine can be cut off selectively, so that the flexibility of peak regulation of the unit is enhanced, the heat supply capacity of the unit can be greatly improved, and the heat supply economy is improved.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of turbines, and relates to a turbine system and a method for improving the flexibility of a heat supply unit.
[ background of the invention ]
The external heat supply can effectively reduce the energy consumption index of the thermal power generator set, the cogeneration is one of important development directions of power enterprises, but the heat supply unit has larger peak regulation requirements along with the increase of the peak regulation depth requirement of the power grid on the thermal power generator set.
However, since the supply steam needs to be kept at a certain pressure, and the low-pressure cylinder of the steam turbine can also have blade damage if the steam inlet quantity is lower than a limit value. Therefore, the steam inlet flow and the load of a common heating unit are limited by the lowest value, and the deep peak regulation is difficult. If the steam turbine adopts high back pressure heat supply, although the economic nature is better, the unit peak regulation ability is relatively poor to need to tear the jar before the heat supply and change the rotor, can't switch on line. Through the technical means, the low-pressure cylinder of the steam turbine is cut off or put into operation on line according to peak regulation and heat supply requirements, so that the peak regulation capacity of the steam turbine in the heat supply period can be greatly enhanced, the heat supply economical efficiency is improved, and the risk of damage to the blades of the low-pressure cylinder of the steam turbine in the heat supply period is eliminated.
[ summary of the invention ]
The invention aims to solve the problems in the prior art and provides a steam turbine system and a method for improving the flexibility of a heat supply unit.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a steam turbine system for enhancing flexibility of a heating unit, comprising:
the steam source of the steam turbine high-pressure cylinder is superheated steam, and a rotor of the steam turbine high-pressure cylinder is connected with a rotor of the steam turbine intermediate-pressure cylinder;
the steam source of the steam turbine intermediate pressure cylinder is reheated steam, and a rotor of the steam turbine intermediate pressure cylinder is connected with a rotor of the double-output-shaft generator; one part of the exhausted steam of the turbine intermediate pressure cylinder enters a heat supply pipeline to supply heat to the outside, and the other part of the exhausted steam enters a first turbine low pressure cylinder and a second turbine low pressure cylinder;
the other end of the rotor of the double-output-shaft generator is connected with the rotor of the low-pressure cylinder of the first turbine;
the first turbine low-pressure cylinder is connected with the rotor of the second turbine low-pressure cylinder; and the exhaust steam of the first steam turbine low-pressure cylinder and the second steam turbine low-pressure cylinder enters a condenser.
The invention further improves the following steps:
and the double-output-shaft generator is connected with the first turbine low-pressure cylinder through a first overrunning clutch.
And the first turbine low-pressure cylinder and the second turbine low-pressure cylinder are connected through a second overrunning clutch.
The exhaust steam of the steam turbine intermediate pressure cylinder is divided into three paths, the first path enters a heat supply pipeline to supply heat to the outside, the second path enters the first steam turbine low pressure cylinder through a regulating valve and a first isolating valve, and the third path enters the second steam turbine low pressure cylinder through the regulating valve and a second isolating valve.
A method for improving flexibility of a heat supply unit comprises the following steps:
when the engine set is pure condensed or the external steam supply amount is lower than a threshold value, a first isolation valve and a second isolation valve are opened, the double-output-shaft generator and the first overrunning clutch are in a connected state, and the second overrunning clutch is in a connected state; the first steam turbine low pressure cylinder and the second steam turbine low pressure cylinder are filled with steam and are in a normal running state, and external heat supply parameters are adjusted by the adjusting valve;
when the steam supply quantity outside the unit is large or the power grid needs deep peak shaving of the unit, the first isolation valve is opened, and the second isolation valve is closed; the rotating speed of the low-pressure cylinder of the second turbine is reduced, the second overrunning clutch is automatically disengaged, the output of the low-pressure cylinder of the second turbine is reduced to zero, and the regulating valve is used for assisting in regulating steam supply parameters to finish the cutting process;
when the unit needs to put the second steam turbine low-pressure cylinder into operation again, the second isolation valve is opened, the rotating speed of the second steam turbine low-pressure cylinder rises, the second overrunning clutch is automatically connected, the output of the second steam turbine low-pressure cylinder gradually rises according to the requirement, and the regulating valve assists in regulating steam supply parameters to complete the switching operation process;
when the external steam supply of the unit is higher than a threshold value and all the low-pressure cylinders of the turbine are required to be cut off for deep peak regulation, closing the first isolation valve and the second isolation valve, and reducing the rotating speed of the first low-pressure cylinder of the turbine and the rotating speed of the second low-pressure cylinder of the turbine; the first overrunning clutch and the second overrunning clutch are automatically in a disengaged state, the output of the first steam turbine low-pressure cylinder and the second steam turbine low-pressure cylinder is reduced to zero, the exhaust steam of the steam turbine medium-pressure cylinder completely supplies heat to the outside, and the process of completely cutting off the steam turbine low-pressure cylinder is completed;
when the unit needs to be switched from a complete cutting-off state of the low-pressure cylinder of the steam turbine to a commissioning state, the first isolation valve is opened, the rotating speed of the low-pressure cylinder of the first steam turbine is increased, and the first overrunning clutch is automatically connected when the rotating speed of the low-pressure cylinder of the first steam turbine is increased to be the same as that of the double-output-shaft generator; and then the second isolating valve is opened, the rotating speed of the low-pressure cylinder of the second steam turbine is increased, the second overrunning clutch is automatically connected when the rotating speed is increased to the set rotating speed, and the regulating valve is used for assisting in regulating steam supply parameters to complete the switching operation.
Compared with the prior art, the invention has the following beneficial effects:
according to the method, the first low-pressure cylinder and the second low-pressure cylinder of the turbine can be cut off on line according to the peak regulation requirement of the power grid in the heat supply period. The rotor of the low-pressure cylinder of the steam turbine can be completely separated from the generator, temperature reduction and cooling are not needed, and the risk of blade damage caused by small steam inlet amount of the low-pressure cylinder of the steam turbine is eliminated. One or all low-pressure cylinders of the steam turbine can be cut off selectively, so that the flexibility of peak regulation of the unit is enhanced, the heat supply capacity of the unit can be greatly improved, and the heat supply economy is improved.
The generator is provided with two output shafts, two sets of overrunning clutches are arranged, and the low-pressure cylinder rotor of the auxiliary steam turbine is disconnected from or connected with the generator rotor on line. And a heat supply regulating valve is arranged on the middle and low pressure communicating pipes to assist in steam supply parameter regulation, and an isolating valve is arranged on a steam inlet pipeline of the low pressure cylinder of the steam turbine to assist in cutting off the low pressure cylinder of the steam turbine. The invention can be applied to a power generation turbine which uses the steam exhausted by the intermediate pressure cylinder of the turbine to supply heat to the outside, the turbine can cut off all the low pressure cylinders of the turbine on line, or only one low pressure cylinder of the turbine, the shafting of the low pressure cylinder of the turbine is separated from the generator after cutting off, the risk of water erosion of the blades of the low pressure cylinder of the turbine is eliminated, the heat supply amount to the outside of the unit can be increased, the heat supply economical efficiency is improved, the peak regulation depth of the unit can be increased, all the low pressure cylinders of the turbine can be cut off or only part of the low pressure cylinders of the turbine can be cut off according to the peak regulation requirement, the output of the low pressure cylinders of the turbine can be adjusted according.
[ description of the drawings ]
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic view of the overall structure of the present invention.
Wherein, 1-high pressure cylinder of steam turbine; 2-a steam turbine intermediate pressure cylinder; 3-a double-output shaft generator; 4-a first overrunning clutch; 5-a first turbine low pressure cylinder; 6-a second overrunning clutch; 7-second turbine low pressure cylinder; 8-adjusting valve; 9-a first isolation valve; 10-a second isolation valve; 11-a condenser.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the steam turbine system for improving the flexibility of the heat supply unit of the present invention includes a steam turbine high pressure cylinder 1, a steam turbine intermediate pressure cylinder 2, a double output shaft generator 3, a first overrunning clutch 4, a first steam turbine low pressure cylinder 5, a second overrunning clutch 6, a second steam turbine low pressure cylinder 7, a regulating valve 8, a first isolating valve 9, and a second isolating valve 10; the rotor of the turbine intermediate pressure cylinder 2 is connected with the rotor of the double-output-shaft generator 3, and the other end of the generator rotor is connected with the rotor of the first turbine low pressure cylinder 5 through a first overrunning clutch 4. The rotors of the first and second low- pressure turbine cylinders 5 and 7 are connected by a second overrunning clutch 6. And a part or all of the steam discharged by the steam turbine intermediate pressure cylinder 2 enters an external heat supply pipeline, and the part of the steam discharged by the steam turbine intermediate pressure cylinder 2 which does not enter the heat supply pipeline enters the first steam turbine low pressure cylinder 5 and the second steam turbine low pressure cylinder 7 through the regulating valve 8.
The principle of the invention is as follows:
by opening and closing the first isolation valve 9 and the second isolation valve 10, the first turbine low-pressure cylinder 5 and the second turbine low-pressure cylinder 7 can be put in or cut off at any time. The overrunning clutch is disconnected and connected on line, so that the first turbine low-pressure cylinder 5 and the second turbine low-pressure cylinder 7 can be connected and disconnected with the double-output-shaft generator 3 at any time. The purposes of improving the peak regulation capacity of the heat supply unit, eliminating the risk of water erosion of the low-pressure cylinder blade of the steam turbine, increasing the external heat supply amount of the unit and improving the heat supply economy are achieved.
The working process of the invention is as follows:
when the unit is pure condensed or the external steam supply amount is small, the first isolation valve 9 and the second isolation valve 10 are in an opening state, the double-output-shaft generator 3 and the first overrunning clutch 4 are in a connection state, and the second overrunning clutch 6 is also in a connection state. The first steam turbine low pressure cylinder 5 and the second steam turbine low pressure cylinder 7 have steam entering and are in a normal operation state, and external heat supply parameters are adjusted by the adjusting valve 8.
When the steam supply outside the unit is large or the power grid needs deep peak shaving of the unit, the first isolation valve 9 is in an open state, and the second isolation valve 10 is gradually closed. And then the second steam turbine low-pressure cylinder 7 gradually reduces the steam admission to zero, the rotating speed also gradually decreases, the second overrunning clutch 6 automatically disengages, the output of the second steam turbine low-pressure cylinder 7 decreases to zero, the regulating valve 8 assists in regulating steam supply parameters, and finally the cutting process is completed.
When the unit needs to put the second steam turbine low-pressure cylinder 7 into operation again, the second isolation valve 10 is gradually opened, the rotating speed of the second steam turbine low-pressure cylinder 7 gradually rises due to the gradual increase of steam admission, the second overrunning clutch 6 is automatically connected, the output force of the second steam turbine low-pressure cylinder 7 gradually rises according to the requirement, the regulating valve 8 assists in regulating steam supply parameters, and finally the switching operation process is completed.
When the machine set has large external steam supply amount and needs to cut off all the low-pressure cylinders of the steam turbine for deep peak regulation, the first isolation valve 9 and the second isolation valve 10 are gradually closed, the steam inlet of the first low-pressure cylinder 5 of the steam turbine and the steam inlet of the second low-pressure cylinder 7 of the steam turbine are gradually reduced to zero, and the rotating speed is also reduced. At the moment, the first overrunning clutch 4 and the second overrunning clutch 6 are automatically in a disengaged state, the output forces of the first steam turbine low pressure cylinder 5 and the second steam turbine low pressure cylinder 7 are reduced to zero, the exhaust steam of the steam turbine medium pressure cylinder 2 completely supplies heat to the outside, and finally the complete cutting process of the steam turbine low pressure cylinder is completed.
When the unit needs to be switched from a complete cutting-off state of the low-pressure cylinder of the steam turbine to a commissioning state, the first isolation valve 9 is gradually opened, at the moment, the rotating speed of the low-pressure cylinder 5 of the first steam turbine is gradually increased to be the same as that of the double-output-shaft generator 3, and the first overrunning clutch 4 is automatically connected. And then gradually opening the second isolation valve 10, starting steam admission of the second steam turbine low-pressure cylinder 7, gradually increasing the rotating speed, automatically connecting the second overrunning clutch 6 when the rotating speed is increased to a certain rotating speed, and adjusting the steam supply parameters in an auxiliary mode through the adjusting valve 8 to finally complete the switching stroke.
The invention has clear principle and simple system, and can ensure that the low-pressure cylinder of the steam turbine can be put into operation and stopped without stopping the operation. The method is suitable for all heat supply generating sets with low-pressure cylinders of the steam turbine, and is an innovative technology for enhancing the peak regulation capacity of the heat supply generating sets, eliminating the water erosion risk of the low-pressure cylinders of the steam turbine, increasing the heat supply amount and improving the heat supply economical efficiency of the generating sets.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A steam turbine system for improving flexibility of a heat supply unit is characterized by comprising:
the steam turbine high-pressure cylinder (1), the steam source of the steam turbine high-pressure cylinder (1) is superheated steam, and the rotor of the steam turbine high-pressure cylinder is connected with the rotor of the steam turbine intermediate-pressure cylinder (2);
the steam turbine intermediate pressure cylinder (2), the steam source of the steam turbine intermediate pressure cylinder (2) is reheat steam, and the rotor of the steam turbine intermediate pressure cylinder is connected with the rotor of the double-output-shaft generator (3); one part of the steam discharged by the steam turbine intermediate pressure cylinder (2) enters a heat supply pipeline to supply heat to the outside, and the other part of the steam enters a first steam turbine low pressure cylinder (5) and a second steam turbine low pressure cylinder (7);
the other end of the rotor of the double-output-shaft generator (3) is connected with the rotor of the first turbine low-pressure cylinder (5);
the first turbine low-pressure cylinder (5), the first turbine low-pressure cylinder (5) is connected with the rotor of the second turbine low-pressure cylinder (7); the exhaust steam of the first turbine low-pressure cylinder (7) and the second turbine low-pressure cylinder (7) enters a condenser (11).
2. Steam turbine system for increasing the flexibility of a heating unit according to claim 1, characterized in that the double output shaft generator (3) is connected with the first low pressure turbine cylinder (5) through a first overrunning clutch (4).
3. Steam turbine system for increasing flexibility of a heating unit according to claim 1 or 2, characterized in that the first and second low-pressure turbine cylinders (5, 7) are connected by a second overrunning clutch (6).
4. The steam turbine system for improving the flexibility of the heat supply unit according to claim 1 or 2, wherein the steam exhaust of the intermediate pressure cylinder (2) of the steam turbine is divided into three paths, the first path enters the heat supply pipeline to supply heat to the outside, the second path enters the first low pressure cylinder (5) of the steam turbine through the regulating valve (8) and the first isolating valve (9), and the third path enters the second low pressure cylinder (7) of the steam turbine through the regulating valve (8) and the second isolating valve (10).
5. A method for increasing the flexibility of a heating unit using the system of claim 4, comprising the steps of:
when the engine set is pure condensed or the external steam supply amount is lower than a threshold value, a first isolation valve (9) and a second isolation valve (10) are opened, the double-output-shaft generator (3) and the first overrunning clutch (4) are in a connected state, and the second overrunning clutch (6) is in a connected state; steam enters the first steam turbine low pressure cylinder (5) and the second steam turbine low pressure cylinder (7) and is in a normal running state, and external heat supply parameters are adjusted by an adjusting valve (8);
when the steam supply quantity outside the unit is large or the power grid needs unit deep peak shaving, the first isolation valve (9) is opened, and the second isolation valve (10) is closed; the rotating speed of the second steam turbine low pressure cylinder (7) is reduced, the second overrunning clutch (6) is automatically disengaged, the output of the second steam turbine low pressure cylinder (7) is reduced to zero, and the regulating valve (8) is used for assisting in regulating steam supply parameters to complete the cutting process;
when the unit needs to put the second steam turbine low-pressure cylinder (7) into operation again, a second isolation valve (10) is opened, the rotating speed of the second steam turbine low-pressure cylinder (7) rises, the second overrunning clutch (6) is automatically connected, the output of the second steam turbine low-pressure cylinder (7) gradually rises according to the requirement, and the regulating valve (8) is used for assisting in regulating steam supply parameters to complete the switching operation process;
when the external steam supply of the unit is higher than a threshold value and all the low-pressure cylinders of the turbine are required to be cut off for deep peak regulation, closing the first isolation valve (9) and the second isolation valve (10), and reducing the rotating speed of the first low-pressure cylinder (5) and the second low-pressure cylinder (7) of the turbine; the first overrunning clutch (4) and the second overrunning clutch (6) are automatically in a disengaged state, the output of the first steam turbine low pressure cylinder (5) and the second steam turbine low pressure cylinder (7) is reduced to zero, and the exhaust steam of the steam turbine intermediate pressure cylinder (2) completely supplies heat to the outside to complete the complete cutting process of the steam turbine low pressure cylinder;
when the unit needs to be switched from a complete cutting-off state of a low-pressure cylinder of the steam turbine to a commissioning state, a first isolation valve (9) is opened, the rotating speed of the low-pressure cylinder (5) of the first steam turbine is increased, and when the rotating speed of the low-pressure cylinder of the first steam turbine is increased to be the same as that of the double-output-shaft generator (3), a first overrunning clutch (4) is automatically connected; and then the second isolating valve (10) is opened, the rotating speed of the second steam turbine low-pressure cylinder (7) is increased, the second overrunning clutch (6) is automatically connected when the rotating speed is increased to the set rotating speed, and the regulating valve (8) is used for assisting in regulating steam supply parameters to complete the switching operation process.
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| CN202010898931.3A CN111927569B (en) | 2020-08-31 | 2020-08-31 | Steam turbine system and method for improving flexibility of heat supply unit |
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| CN202010898931.3A CN111927569B (en) | 2020-08-31 | 2020-08-31 | Steam turbine system and method for improving flexibility of heat supply unit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114439559A (en) * | 2021-12-09 | 2022-05-06 | 广西电网有限责任公司电力科学研究院 | Heat supply method for mutual switching between condensing type and high back pressure of steam turbine generator set |
| CN114483214A (en) * | 2021-12-09 | 2022-05-13 | 广西电网有限责任公司电力科学研究院 | Condensing and high-back-pressure mutually-switched heat supply system |
| WO2024075468A1 (en) * | 2022-10-06 | 2024-04-11 | 三菱パワー株式会社 | Steam turbine and method for modifying same |
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| CN114439559B (en) * | 2021-12-09 | 2024-02-06 | 广西电网有限责任公司电力科学研究院 | Heat supply method for switching condensing type and high back pressure of steam turbine generator set |
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