CN110656986B - Circulating cooling water system of steam turbine and operation method thereof - Google Patents
Circulating cooling water system of steam turbine and operation method thereof Download PDFInfo
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- CN110656986B CN110656986B CN201910980122.4A CN201910980122A CN110656986B CN 110656986 B CN110656986 B CN 110656986B CN 201910980122 A CN201910980122 A CN 201910980122A CN 110656986 B CN110656986 B CN 110656986B
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- 239000000498 cooling water Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 82
- 238000010438 heat treatment Methods 0.000 claims description 11
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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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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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention discloses a circulating cooling water system of a steam turbine and an operation method thereof, which solve the problems that the cooling water system is too little in cooling exhaust and the operation of the cooling water system has potential safety hazards in the prior art. The technical proposal is as follows: the device comprises a condenser, a cooling tower and a forehearth, wherein the condenser is connected with the forehearth through a first circulation pipeline, and the condenser is connected with the cooling tower through a second circulation pipeline; one or more bypass circulating pumps are connected in parallel between the first circulating pipeline and the forehearth, a manual valve I and an electric valve V are respectively arranged on two sides of the bypass circulating pump, and a check valve is arranged between the bypass circulating pump and the electric valve V; the first circulating pipeline is connected with a backwater branch I for circulating cooling water of the auxiliary machine to flow in; the second circulation pipeline is connected with a connecting branch III for cooling water of the auxiliary machine to the temporary forebay.
Description
Technical Field
The invention relates to a circulating water cooling system of a thermal power plant, in particular to a circulating water cooling system of a steam turbine and an operation method thereof.
Background
At present, with the increasing living standard, the urban scale is larger and larger, the heating demand is also rising year by year, and more pure condensing units are used for heating reconstruction. In the heating period, even if the condensing unit is adopted, the exhaust steam quantity of the low-pressure cylinder can be greatly reduced, and if the condensing unit is transformed into a high-back pressure unit, the exhaust steam quantity required to be cooled by the original circulating cooling system is reduced. Although the wiring mode of the circulating pump motor is changed, the rotating speed is reduced, and the water quantity is reduced, more station service electricity is still wasted.
The existing circulating water cooling system of the thermal power plant is large in circulating water quantity, two circulating water pumps of each unit are common, one circulating water quantity is slightly smaller, and the other circulating water quantity is slightly larger. When the water pump is operated in winter, the connection mode of the motor of the water circulating pump is generally changed because the environmental temperature is low and the vacuum of the unit is high, and the water circulating quantity is properly reduced, so that the power consumption of factories is saved.
Because the exhaust steam required to be cooled by the original circulating water system is too little or even not, when the original circulating water pump is operated, the water temperature is lower, and the water is easy to freeze when the air temperature is lower, thereby threatening the safe operation of the cooling water system. The inventor finds that if the condenser does not need to be filled with the original circulating water and only supplies auxiliary machine cooling water, the pressure of the circulating pump outlet and the pressure of a system pipeline are greatly increased, and the operation safety of the original circulating water system is seriously influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a circulating cooling water system of a steam turbine and an operation method thereof, and when the condenser does not need the original circulating cooling water in a low vacuum mode, an on-machine water supply or bypass circulating pump is adopted, so that the pressure of the original circulating water system can be effectively reduced, and the safety of the system is protected.
The invention adopts the following technical scheme:
the circulating cooling water system of the steam turbine comprises a condenser, a cooling tower and a forehearth, wherein the condenser is connected with the forehearth through a first circulating pipeline, and the condenser is connected with the cooling tower through a second circulating pipeline;
one or more bypass circulating pumps are connected in parallel between the first circulating pipeline and the forehearth, a manual valve I and an electric valve V are respectively arranged on two sides of the bypass circulating pump, and a check valve is arranged between the bypass circulating pump and the electric valve V; the first circulating pipeline is connected with a backwater branch I for circulating cooling water of the auxiliary machine to flow in;
the second circulation pipeline is connected with a connecting branch III for auxiliary machine cooling water to the temporary forebay.
Further, the first circulating pipeline comprises a connecting branch I, and the connecting branch I is connected with a circulating pump I and a circulating pump II which are mutually connected in parallel;
the bypass circulating pump is connected with the circulating pump I and the circulating pump II in parallel, and the backwater branch I is connected with the connecting branch I and is provided with the manual valve II.
Further, the lift of the bypass circulating pump is not smaller than the circulating pump II and not larger than the circulating pump I.
Further, the second circulation pipeline comprises a connecting branch II connected between the condenser and the cooling tower, and one side of the connecting branch II is connected to the cooling tower through a connecting branch VI;
the other side of the connecting branch II is connected with the connecting branch III through the connecting branch IV, the connecting branch III is connected with the backwater branch II through the connecting branch IV, and the connecting branch III is connected with the cold water tower through the connecting branch V.
Further, a manual valve IV is arranged on the connecting branch IV, an electric valve V is arranged on the connecting branch I, an electric valve I is arranged between the circulating pump I and the foretank, and an electric valve II is arranged between the circulating pump I and the connecting branch I; an electric valve III is arranged between the circulating pump II and the forehearth, and an electric valve IV is arranged between the circulating pump II and the connecting branch I;
an electric valve VI is arranged on the connecting branch II, and an electric valve VII is arranged on the connecting branch VI; the manual valve V is arranged on the connecting branch V, and the manual valve III is arranged on the connecting branch III.
Further, the second circulation pipeline comprises a connecting branch II connected between the condenser and the cooling tower, and one side of the connecting branch II is connected to the cooling tower through a connecting branch VI;
the cooling tower is connected with the connecting branch V, the connecting branch V is connected with the backwater branch II, and the connecting branch V is connected with the backwater branch II through the connecting branch III.
Further, an electric valve V is arranged on the connecting branch I, an electric valve I is arranged between the circulating pump I and the foretank, and an electric valve II is arranged between the circulating pump I and the connecting branch I; an electric valve III is arranged between the circulating pump II and the forehearth, and an electric valve IV is arranged between the circulating pump II and the connecting branch I;
an electric valve VI is arranged on the connecting branch II, and an electric valve VII is arranged on the connecting branch VI; the manual valve V is arranged on the connecting branch V, and the manual valve III is arranged on the connecting branch III.
The operation method of the turbine circulating cooling water system is that when the turbine is operated in a low vacuum mode in a heating period of a unit, the electric valve V and the electric valve VI are closed, and the following operation modes can be selected:
1) When the backwater branch I and the connecting branch III are used for ensuring the running of the unit, the electric valve I, the electric valve II, the electric valve III and the electric valve IV are closed, the bypass circulation pump is hot for standby, the manual valve I is opened, and the electric valve V is charged to be interlocked in a closed state; the manual valve II and the manual valve III are opened, the manual valve IV and the manual valve V are closed, one part of auxiliary machine cooling water is consumed and used, and the other part of auxiliary machine cooling water returns to the temporary front pool through the water return branch II and the connecting branch III;
2) When the backwater branch I and the connection branch III are not used, the bypass circulating pump normally operates during low vacuum operation, the circulating pump I and the circulating pump II are powered off, the electric valve I, the electric valve II, the electric valve III and the electric valve IV are closed, the manual valve I, the electric valve V and the manual valve V are opened, the manual valve IV is closed, a part of auxiliary machine cooling water is consumed and used, and a part of auxiliary machine cooling water returns to the water tank of the cooling tower through the backwater branch II and the connection branch V.
The operation method of the turbine circulating cooling water system is that when the turbine is operated in a high back pressure mode in a heating period of a unit, the electric valve V and the electric valve VI are opened, and the following operation modes can be selected:
1) When the backwater branch I and the connecting branch III are used for ensuring the operation of the unit, the circulating pump I and the circulating pump II are electrified for standby, the electric valve I and the electric valve III are opened, and the electric valve II and the electric valve IV are electrified for interlocking in a closed state; the bypass circulating pump is in hot standby, the manual valve I is opened, and the electric valve V is closed in an electrified manner; the manual valve II and the manual valve III are opened, the manual valve V is closed, a part of auxiliary machine cooling water is consumed and used, and the other part of auxiliary machine cooling water returns to the temporary front pool through the backwater branch II and the connecting branch III;
2) When the backwater branch I and the connection branch III are not used, the bypass circulating pump normally operates, the electric valve I, the electric valve III, the manual valve I, the electric valve V and the manual valve V are opened, the circulating pump I and the circulating pump II are in hot standby, and the electric valve II and the electric valve IV are closed in an electrified linkage manner; and part of auxiliary machine cooling water is consumed and used, and the other part of auxiliary machine cooling water returns to the water tank of the cooling water tower through the water return branch II and the connecting branch V.
Further, the electric door VII is utilized to adjust the flow rate of the upper part of the cooling tower to control the water temperature; when the bypass circulating pump fails, the circulating pump II which is put into hot standby is started, when the circulating pump II fails, the circulating pump I is put into the circulating pump, and when the circulating pump I fails again and no circulating water is available, the machine set is shut down.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, under a low vacuum mode, when the condenser does not need the original circulating cooling water, the temporary water supply or the bypass circulating pump is adopted, so that the pressure of the original circulating water system can be effectively reduced, and the system safety is protected; the electricity can be saved when the temporary water supply or the bypass circulating pump is adopted;
(2) When the bypass circulating pump is used for standby, the safety coefficient of the machine is increased, and the non-stop probability of the unit is reduced; the water circulating system can be prevented from being forced to stop due to water loss caused by the fact that the water circulating temperature is too low, the water tower is frozen and the filter screen is blocked when the original circulating pump is operated; the evaporation consumption of the circulating water can be reduced, and the water resource is saved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of the present invention;
wherein 1, electric valve I,2, electric valve II,3, electric valve III,4, electric valve IV,5, manual valve I,6, check valve, 7, electric valve V,8, manual valve II,9, electric valve V,10, electric valve VI,11, manual valve III,12, manual valve IV,13, manual valve V,14, electric valve VII,15, condenser, 16, cooling tower, 17, forehearth, 18, circulation pump I,19, circulation pump II,20, bypass circulation pump, 21, backwater branch I,22, water supply branch I,23, connection branch I,24, connection branch II,25, backwater branch II,26, connection branch III,27, connection branch IV,28, connection branch V,29, connection branch VI.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "upper", "lower", "left" and "right" in this application, if they mean only the directions of upper, lower, left and right in correspondence with the drawings themselves, do not limit the structure, and merely facilitate description of the present invention and simplify description, without indicating or implying that the apparatus or elements to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "mounted," "connected," "secured," and the like in this application are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the terms are used herein as specific meanings as understood by those of ordinary skill in the art, and are not limited to the following terms.
As described in the background art, the prior art has the defects of too little exhaust gas of the cooling water system and potential safety hazard of the operation of the cooling water system, and in order to solve the technical problems, the invention provides a circulating cooling water system of a steam turbine and an operation method thereof.
Embodiment one:
the present invention will be described in detail with reference to fig. 1, and the specific structure is as follows:
the embodiment discloses a turbine circulating cooling water system, which comprises a condenser 15, a cooling tower 16, a forehearth 17, a first circulating pipeline and a second circulating pipeline, wherein the condenser 15 is connected with the forehearth 17 through the first circulating pipeline, and the condenser 15 is connected with the cooling tower 16 through the second circulating pipeline; one or more bypass circulation pumps 20 are connected in parallel between the first circulation pipeline and the foretank 17, the first circulation pipeline is connected with a backwater branch I21 for circulating cooling water of the auxiliary machine of the temporary machine to flow in, the second circulation pipeline is connected with a connection branch III26, and the circulating water is connected with auxiliary machine cooling water such as air cooler, oil cooler, open water, water injection tank water supplementing and the like through the connection branch III 26.
Specifically, the first circulation pipeline includes a connection branch I23, and the circulating water passes through the connection branch I23 to the condenser 15. An electric valve V9 is arranged on the connecting branch I23, and the connecting branch I23 is connected with a circulating pump I18 and a circulating pump II19 which are mutually connected in parallel; an electric valve I1 is arranged between the circulating pump I18 and the forehearth 17, and an electric valve II2 is arranged between the circulating pump I18 and the connecting branch I23. An electric valve III3 is arranged between the circulating pump II19 and the forehearth 17, and an electric valve IV4 is arranged between the circulating pump II19 and the connecting branch I23.
The bypass circulating pump 20 is connected with the circulating pump I18 and the circulating pump II19 in parallel, the lift of the bypass circulating pump 20 is generally not smaller than the circulating pump II19 and not larger than the circulating pump I18, and can be slightly larger than the circulating pump I18 and not exceeding the allowable pressure of a pipeline. The flow rate of the bypass circulation pump 20 is about 5% to 10% of the minimum flow rate of the circulation pump II19, the proper sewage treatment capacity, and about 60 times of the low-pressure cylinder exhaust capacity required for circulating water cooling, and can be set according to practical requirements.
A manual valve I5 and an electric valve V are arranged between the bypass circulating pump 20 and the foretank 17, and the bypass circulating pump 20 is connected with the connecting branch I23 through a check valve 6 and an electric valve V7. The motorised valve II2, the motorised valve IV4, the motorised valve V7 are connected to the same end of the connecting branch I, and two branches are connected between the motorised valve V9 and the motorised valve II2, the motorised valve IV4, the motorised valve V7, namely: the water supply branch I22 and the backwater branch I21, wherein the backwater branch I21 is provided with a manual valve II8.
The second circulation pipeline comprises a connection branch II24 connected between the condenser 15 and the cooling tower 16, and circulating water flows from the condenser 15 to the local cooling tower 16 through the connection branch II 24. The connection branch II24 is provided with an electric valve VI10, one side of the connection branch II24 is connected to the cooling tower 16 through a connection branch VI29, circulating water is connected to a water tank of the water chiller through the connection branch VI29, and the connection branch VI29 is provided with an electric valve VII.
The other side of the connecting branch II24 is connected with a connecting branch III26 through a connecting branch IV27, the connecting branch IV27 is a water return pipeline from auxiliary cooling water to circulating water, and the auxiliary cooling water is sent to the temporary forehearth 16 through the connecting branch III 26; a manual valve IV is arranged on the connecting branch IV27, a return branch II25 for inflow of auxiliary cooling water is connected between the connecting branch III26 and the connecting branch IV27, and a manual valve III11 is arranged on the connecting branch III 26; and the connecting branch III26 and the connecting branch IV27 are connected with the cooling tower 16 through a connecting branch V28, auxiliary machine cooling water is supplied to the water tank of the machine through the connecting branch V28, and a manual valve V13 is arranged on the connecting branch V28.
The bypass circulation pump 20 may be one, two or more, and the plurality of bypass circulation pumps 20 are spare for each other because the pump flow rate is small, and the added cost and operation are small. The number of the electric valves V9 and VI10 is 2 times the number of the low-pressure cylinders, which are 2 in this example, and it is understood that the number of the electric valves V9 and VI10 may be 4, 8, or the like in other embodiments.
Compared with the original circulating water system, the bypass circulating pump 20, the backwater branch I21, the connecting branch III26, the connecting branch IV27 and related valves are added, the original circulating water system is kept normal when the unit is operated in a non-heating period, the bypass circulating pump 20 is powered off, and the manual valve I5, the electric valve V7, the manual valve II8, the manual valve III11 and the manual valve IV12 are closed.
The steam turbine recirculated cooling water system of this embodiment can handle the steam turbine low pressure jar and reduce to zero to original circulating cooling water system exhaust by a wide margin, and the unit heats when the low vacuum mode down operation in period:
the low pressure cylinder exhaust steam heating main pipe network, the main pipe network operation mode is prior art, and the description is omitted here. The original circulating water does not provide cooling water to the condenser 15 any more, and the electric valve V9 and the electric valve VI10 are closed.
If the return water branch I21 and the connection branch III26 are utilized to ensure the operation of the unit, the temporary circulation pump must normally operate and a standby circulation pump is arranged. Because the through flow of the water supply branch I22 and the water return branch II25 is smaller, the circulating pump I18 and the circulating pump II19 are not in power failure (generally, even if in standby, after starting, the pressure is too high, the equipment is greatly damaged, and if the equipment is connected with a main pipe of a thicker pipeline, the water quantity is also very quickly exhausted).
The electric valve I2, the electric valve II2, the electric valve III3 and the electric valve IV4 are closed for power failure, the bypass circulating pump 20 is in hot standby, the manual valve I5 is opened, and the electric valve V7 is in an electrified switching interlocking state; the manual valves II8 and III11 are opened, the manual valves IV12 and V13 are closed, a part of auxiliary machine cooling water is consumed and used, and a part of auxiliary machine cooling water returns to the temporary foretank 17 through the water return branch II25 and the connecting branch III 26.
In the event of a failure, the circulating water cannot normally run, for example, two circulating pumps cannot normally use. Because the local vacuum is not affected, there is some time for accident handling. The bypass circulating pump 20 is started immediately, the electric valve V7 is started in a linkage way, the electric valve of the temporary circulating water phase is closed, and the backwater branch I does not flow backwards. The manual valve V13 is opened, and the manual valves II8 and III11 are closed.
If the backwater branch I21 and the connecting branch III26 are not used or not used, the bypass circulating pump 20 normally operates during low vacuum operation, the circulating pump I18 and the circulating pump II19 are powered off, the electric valve I1, the electric valve II2, the electric valve III3 and the electric valve IV4 are closed, the manual valve I5, the electric valve V7 and the manual valve V13 are opened, the manual valve IV12 is closed, a part of auxiliary machine cooling water is consumed and used, and a part of auxiliary machine cooling water returns to the cooling water tank 17 through the backwater branch II25 and the connecting branch V28.
The environment temperature in the heating period is generally lower, the water in the water tower pool can be cooled by naturally radiating, if the cooling effect is not ideal, the manual valve IV12 can be opened, the manual valve V13 can be closed, and the electric valve VII 14 is utilized to adjust the flow rate at the upper part of the cooling water tower 16 so as to control the water temperature.
Embodiment two:
as shown in fig. 2, in this embodiment, compared with the first embodiment, the connection branch IV27 and the manual valve IV12 are not provided, and other structures are the same and will not be described here.
When the unit is operated in modes of high back pressure (little or no steam exhaust amount of the low-pressure cylinder) or cylinder cutting of the low-pressure cylinder in the heating period, and the like:
the low-pressure cylinder rotor can be an optical axis or a moving blade, and a small part of steam warms the low-pressure cylinder rotor during the optical axis, so that the temperature of the rotor is ensured to be above the brittle transition temperature. When moving blades are arranged, a small part of steam is required to take away the heat of the blowing effect, and the low-pressure cylinder has a small amount of exhaust steam. In this mode of operation, the electric valves V9 and VI10 must be opened, and the opening degree is controlled according to actual needs, so as to ensure auxiliary cooling water.
If the return water branch I21 and the connection branch III26 are utilized to ensure the running of the unit, the temporary circulation pump must normally run, a standby circulation pump is arranged, the circulation pump I18 and the circulation pump II19 are provided with electric heat for standby, the electric valves I1 and III3 are opened, and the electric valves II2 and IV4 are provided with electric throw-in interlocks in a closed state. The bypass circulating pump is hot for standby, the manual valve I5 is opened, and the electric valve V7 is closed in an electrified manner; the manual valve II8 and the manual valve III11 are opened, the manual valve V13 is closed, a part of auxiliary machine cooling water is consumed and used, and the other part of auxiliary machine cooling water returns to the temporary front pool 17 through the water return branch II25 and the connecting branch III 26.
In the event of a failure, the circulating water cannot normally run, for example, two circulating pumps cannot normally use. Because the local vacuum is affected, the accident handling time is somewhat less. And immediately starting the bypass circulating pump 20, starting the electric valve V7 in a linkage way, and closing the electric valve related to the temporary circulating water system, so that the backwater branch I does not flow backwards. The manual valve V13 is opened, and the manual valves II8 and III11 are closed.
And part of auxiliary machine cooling water is consumed and used, and the other part of auxiliary machine cooling water returns to the water tank of the local cooling water tower through the water return branch II25 and the connecting branch V28. The electric valve VII 14 is used for adjusting the flow rate of the connecting branch II24 to the upper part of the cooling tower 16 to control the water temperature. When the bypass circulating pump 20 fails, the circulating pump II19 which is put into hot standby is started, the related interlocking valve is opened or closed, when the circulating pump II19 fails, the circulating pump I18 is put into operation, and when the circulating pump I18 fails again and no circulating water is available, the unit is switched on and stopped.
If the backwater branch I21 and the connecting branch III26 are not used or not used, the bypass circulating pump 20 normally operates, the electric valve I1, the electric valve III3, the manual valve I5, the electric valve V7 and the manual valve V13 are opened, the circulating pump I18 and the circulating pump II19 are hot standby, and the electric valve II2 and the electric valve IV4 are closed in an electrified linkage manner; and part of auxiliary machine cooling water is consumed and used, and the other part of auxiliary machine cooling water returns to the water pool of the cooling tower 16 through the water return branch II25 and the connecting branch V28.
The electric valve VII 14 is used for controlling the water temperature by adjusting the flow rate of the upper part of the cooling tower 16. When the bypass circulating pump 20 fails, the circulating pump II19 which is put into hot standby is started, the related interlocking valve is opened or closed, when the circulating pump II19 fails, the circulating pump I18 is put into operation, and when the circulating pump I18 fails again and no circulating water is available, the unit is switched on and stopped.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (3)
1. The operation method of the turbine circulating cooling water system is characterized in that the turbine circulating cooling water system comprises a condenser, a cooling tower and a forehearth, wherein the condenser is connected with the forehearth through a first circulating pipeline, and the condenser is connected with the cooling tower through a second circulating pipeline; one or more bypass circulating pumps are connected in parallel between the first circulating pipeline and the forehearth, a manual valve I and an electric valve V are respectively arranged on two sides of the bypass circulating pump, and a check valve is arranged between the bypass circulating pump and the electric valve V; the first circulating pipeline is connected with a backwater branch I for circulating cooling water of the auxiliary machine to flow in; the second circulating pipeline is connected with a connecting branch III for auxiliary machine cooling water to the temporary front pool;
the first circulating pipeline comprises a connecting branch I, and the connecting branch I is connected with a circulating pump I and a circulating pump II which are mutually connected in parallel;
the bypass circulating pump is connected with the circulating pump I and the circulating pump II in parallel, the backwater branch I is connected with the connecting branch I, and a manual valve II is arranged between the backwater branch I and the connecting branch I;
the lift of the bypass circulating pump is not smaller than the circulating pump II and not larger than the circulating pump I;
the second circulation pipeline comprises a connecting branch II connected between the condenser and the cooling tower, and one side of the connecting branch II is connected to the cooling tower through a connecting branch VI;
the other side of the connecting branch II is connected with a connecting branch III through a connecting branch IV, the connecting branch III is connected with a backwater branch II between the connecting branch IV, and the connecting branch III is connected with a cooling tower through a connecting branch V;
the manual valve IV is arranged on the connecting branch IV, the electric valve V is arranged on the connecting branch I, the electric valve I is arranged between the circulating pump I and the foretank, and the electric valve II is arranged between the circulating pump I and the connecting branch I; an electric valve III is arranged between the circulating pump II and the forehearth, and an electric valve IV is arranged between the circulating pump II and the connecting branch I;
an electric valve VI is arranged on the connecting branch II, and an electric valve VII is arranged on the connecting branch VI; the manual valve V is arranged on the connecting branch V, and the manual valve III is arranged on the connecting branch III;
when the unit is operated in a low vacuum mode in a heating period, the electric valve V and the electric valve VI are closed, and the following operation modes are selected:
1) When the backwater branch I and the connecting branch III are used for ensuring the running of the unit, the electric valve I, the electric valve II, the electric valve III and the electric valve IV are closed, the bypass circulation pump is hot for standby, the manual valve I is opened, and the electric valve V is charged to be interlocked in a closed state; the manual valve II and the manual valve III are opened, the manual valve IV and the manual valve V are closed, one part of auxiliary machine cooling water is consumed and used, and the other part of auxiliary machine cooling water returns to the temporary front pool through the water return branch II and the connecting branch III;
2) When the backwater branch I and the connection branch III are not used, the bypass circulating pump normally operates during low vacuum operation, the circulating pump I and the circulating pump II are powered off, the electric valve I, the electric valve II, the electric valve III and the electric valve IV are closed, the manual valve I, the electric valve V and the manual valve V are opened, the manual valve IV is closed, a part of auxiliary machine cooling water is consumed and used, and a part of auxiliary machine cooling water returns to the water tank of the cooling tower through the backwater branch II and the connection branch V.
2. The operation method of the turbine circulating cooling water system is characterized in that the turbine circulating cooling water system comprises a condenser, a cooling tower and a forehearth, wherein the condenser is connected with the forehearth through a first circulating pipeline, and the condenser is connected with the cooling tower through a second circulating pipeline; one or more bypass circulating pumps are connected in parallel between the first circulating pipeline and the forehearth, a manual valve I and an electric valve V are respectively arranged on two sides of the bypass circulating pump, and a check valve is arranged between the bypass circulating pump and the electric valve V; the first circulating pipeline is connected with a backwater branch I for circulating cooling water of the auxiliary machine to flow in; the second circulating pipeline is connected with a connecting branch III for auxiliary machine cooling water to the temporary front pool;
the first circulating pipeline comprises a connecting branch I, and the connecting branch I is connected with a circulating pump I and a circulating pump II which are mutually connected in parallel;
the bypass circulating pump is connected with the circulating pump I and the circulating pump II in parallel, the backwater branch I is connected with the connecting branch I, and a manual valve II is arranged between the backwater branch I and the connecting branch I;
the lift of the bypass circulating pump is not smaller than the circulating pump II and not larger than the circulating pump I;
the second circulation pipeline comprises a connecting branch II connected between the condenser and the cooling tower, and one side of the connecting branch II is connected to the cooling tower through a connecting branch VI;
the cold water tower is connected with the connecting branch V, the connecting branch V is connected with the backwater branch II, and the connecting branch V is connected with the backwater branch II through the connecting branch III;
an electric valve V is arranged on the connecting branch I, an electric valve I is arranged between the circulating pump I and the forebay, and an electric valve II is arranged between the circulating pump I and the connecting branch I; an electric valve III is arranged between the circulating pump II and the forehearth, and an electric valve IV is arranged between the circulating pump II and the connecting branch I;
an electric valve VI is arranged on the connecting branch II, and an electric valve VII is arranged on the connecting branch VI; the manual valve V is arranged on the connecting branch V, and the manual valve III is arranged on the connecting branch III;
when the unit is operated in a high back pressure mode in a heating period, the electric valve V and the electric valve VI are opened, and the following operation modes are selected:
1) When the backwater branch I and the connecting branch III are used for ensuring the operation of the unit, the circulating pump I and the circulating pump II are electrified for standby, the electric valve I and the electric valve III are opened, and the electric valve II and the electric valve IV are electrified for interlocking in a closed state; the bypass circulating pump is in hot standby, the manual valve I is opened, and the electric valve V is closed in an electrified manner; the manual valve II and the manual valve III are opened, the manual valve V is closed, a part of auxiliary machine cooling water is consumed and used, and the other part of auxiliary machine cooling water returns to the temporary front pool through the backwater branch II and the connecting branch III;
2) When the backwater branch I and the connection branch III are not used, the bypass circulating pump normally operates, the electric valve I, the electric valve III, the manual valve I, the electric valve V and the manual valve V are opened, the circulating pump I and the circulating pump II are in hot standby, and the electric valve II and the electric valve IV are closed in an electrified linkage manner; and part of auxiliary machine cooling water is consumed and used, and the other part of auxiliary machine cooling water returns to the water tank of the cooling water tower through the water return branch II and the connecting branch V.
3. The method for operating a circulating cooling water system of a steam turbine according to claim 1 or 2, wherein the water temperature is controlled by adjusting the upper flow rate of the cooling tower by means of an electric door VII; when the bypass circulating pump fails, the circulating pump II which is put into hot standby is started, when the circulating pump II fails, the circulating pump I is put into the circulating pump, and when the circulating pump I fails again and no circulating water is available, the machine set is shut down.
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| CN201910980122.4A CN110656986B (en) | 2019-10-15 | 2019-10-15 | Circulating cooling water system of steam turbine and operation method thereof |
| PCT/CN2020/121035 WO2021073556A1 (en) | 2019-10-15 | 2020-10-15 | Steam turbine circulating cooling water system and operating method therefor |
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| CN201910980122.4A CN110656986B (en) | 2019-10-15 | 2019-10-15 | Circulating cooling water system of steam turbine and operation method thereof |
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| CN110656986B (en) * | 2019-10-15 | 2024-01-19 | 中国电建集团山东电力建设第一工程有限公司 | Circulating cooling water system of steam turbine and operation method thereof |
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| CN110656986A (en) | 2020-01-07 |
| WO2021073556A1 (en) | 2021-04-22 |
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