CN110656986A - 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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- 239000000498 cooling water Substances 0.000 title claims abstract description 72
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 138
- 238000001816 cooling Methods 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims description 11
- 230000003134 recirculating effect Effects 0.000 claims description 8
- 238000011017 operating method Methods 0.000 claims 1
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- 238000001704 evaporation Methods 0.000 description 1
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- 230000017525 heat dissipation 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
- 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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Abstract
The invention discloses a turbine circulating cooling water system and an operation method thereof, which solve the problems of low exhaust steam of cooling of a circulating water system and potential safety hazard in the operation of the cooling water system in the prior art, and adopt an on-line water supply or bypass circulating pump when a condenser does not need original circulating cooling water in a low vacuum mode, thereby effectively reducing the pressure of the original circulating water system and protecting the safety of the system. The technical scheme is as follows: the system comprises a condenser, a cooling tower and a forebay, wherein the condenser is connected with the forebay 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 forebay, 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 water return branch I for circulating cooling water of the temporary auxiliary machine to flow in; the second circulating pipeline is connected with a connecting branch III which is used for cooling water of the auxiliary machine to reach the machine-approaching 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, along with higher living standard and larger urban scale, the heating demand is also increased year by year, and more pure condensing units are used for heating transformation. In the heating period, even if the condensing unit is used, the steam discharge amount of the low-pressure cylinder is greatly reduced, and if the condensing unit is transformed into a high-back-pressure unit, the steam discharge amount which needs to be cooled by the original circulating cooling system is less. Although the circulating pump motor changes the wiring mode, the rotating speed is reduced, and the water quantity is reduced, more service power is still wasted.
The circulating water cooling system of the existing thermal power plant has large circulating water volume, generally, two circulating water pumps are arranged in each unit, one circulating water volume is slightly smaller, and the other circulating water volume is slightly larger. When the water circulating pump runs in winter, because the environmental temperature is low, the vacuum of the unit is high, the wiring mode of the water circulating pump motor is generally changed, the circulating water quantity is properly reduced, and therefore the station service power is saved.
Because the exhaust steam which needs to be cooled by the original circulating water system is too little or even not, when the original circulating water pump operates, 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 original circulating water and only supplies auxiliary cooling water, the outlet pressure of the circulating pump and the pressure of a system pipeline are greatly increased, and the operation safety of an original circulating water system is seriously influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a turbine circulating cooling water system and an operation method thereof.
The invention adopts the following technical scheme:
a turbine circulating cooling water system comprises a condenser, a cooling tower and a forebay, wherein the condenser is connected with the forebay 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 front pool, a manual valve I and an electric valve V are respectively installed on two sides of each bypass circulating pump, and a check valve is installed between each bypass circulating pump and the electric valve V; the first circulating pipeline is connected with a water return branch I for circulating cooling water of the auxiliary machinery before the aircraft to flow in;
and the second circulating pipeline is connected with a connecting branch III which is used for cooling water of the auxiliary machine to reach a machine-approaching forebay.
Further, the first circulation pipeline comprises a connecting branch I, and the connecting branch I is connected with a circulation pump I and a circulation pump II which are connected in parallel;
the bypass circulating pump is connected with the circulating pump I and the circulating pump II in parallel, the return water branch I is connected with the connecting branch I, and a manual valve II is arranged between the return water branch I and the connecting branch I.
Furthermore, the lift of the bypass circulating pump is not less than that of the circulating pump II and not more than that of 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 a connecting branch III through a connecting branch IV, the connecting branch III is connected with the return water branch II between the connecting branch IV, and the connecting branch III is connected with the cooling water tower through a connecting branch V between the connecting branch IV.
Furthermore, 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 front pool, 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 forebay, 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; and a manual valve V is arranged on the connecting branch V, and a 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 a connecting branch V, the connecting branch V is connected with a return water branch II, and the connecting branch V is connected with the return water branch II and 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 front pool, 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 forebay, 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; and a manual valve V is arranged on the connecting branch V, and a manual valve III is arranged on the connecting branch III.
An operation method of a turbine circulating cooling water system is characterized in that when a unit operates in a low-vacuum mode in a heating period, an electric valve V and an electric valve VI are closed, and the following operation modes can be selected:
1) the water return branch I and the connection branch III are used for ensuring that the unit runs, the electric valve I, the electric valve II, the electric valve III and the electric valve IV are closed, the bypass circulating pump is in hot standby, the manual valve I is opened, and the electric valve V is in a closed state in a live-line switching interlocking mode; the manual valve II and the manual valve III are opened, the manual valve IV and the manual valve V are closed, part of the auxiliary machine cooling water is consumed, and part of the auxiliary machine cooling water returns to the front pool of the next machine through the water return branch II and the connecting branch III;
2) when the water return branch I and the connecting 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, part of cooling water of the auxiliary machine is consumed and used, and the other part of the cooling water returns to the water pool of the cooling water tower through the water return branch II and the connecting branch V.
An operation method of a turbine circulating cooling water system is characterized in that when a unit operates in a high-backpressure mode in a heating period, an electric valve V and an electric valve VI are opened, and the following operation modes can be selected:
1) the water return branch I and the connection branch III are used for ensuring that the unit runs, the circulating pump I and the circulating pump II are electrically heated for standby, the electric valve I and the electric valve III are opened, and the electric valve II and the electric valve IV are electrically switched and interlocked 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 way; the manual valve II and the manual valve III are opened, the manual valve V is closed, part of the auxiliary machine cooling water is consumed and used, and the other part of the auxiliary machine cooling water returns to the pre-machine pool through the water return branch II and the connecting branch III;
2) when the water return branch I and the connecting 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 a linkage manner in an electrified manner; and part of the cooling water of the auxiliary machine is consumed and used, and the other part of the cooling water returns to the water pool of the cooling tower through the water return branch II and the connecting branch V.
Further, the water temperature is controlled by adjusting the flow quantity of the upper part of the cooling tower by using an electric door VII; when bypass circulating pump trouble, start the circulating pump II that drops into hot reserve, when circulating pump II trouble, drop into circulating pump I, when circulating pump I trouble no available circulating water again, the unit is opened a floodgate and is shut down.
Compared with the prior art, the invention has the beneficial effects that:
(1) in a low-vacuum mode, when the condenser does not need original circulating cooling water, the invention adopts an on-line water supply or bypass circulating pump, so that the pressure of the original circulating water system can be effectively reduced, and the safety of the system is protected; and the power can be saved by adopting the on-machine water supply or the bypass circulating pump;
(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 machine set is reduced; the circulating water system can be prevented from being forced to stop due to water loss caused by the fact that a water tower is frozen and a filter screen is blocked when the original circulating pump is operated; can reduce the evaporation consumption of circulating water and save water resources.
Drawings
The accompanying drawings, which 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 are not intended to limit the application.
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram according to a second embodiment of the present invention;
the system comprises a water supply branch I, a water supply branch 23, a water supply branch I, a water supply branch 24, a water supply branch II, a water return branch 25, a water return branch II, a water return branch 26, a water supply branch III, a water supply branch 27, a water supply branch IV, a water supply branch VI, a water supply branch IV, a water supply branch VI, a water supply branch IV, a water supply branch VI, a water supply branch III, a water supply branch IV, a water supply branch 28, a water supply branch V, a water supply branch 29.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this application, if any, merely indicate correspondence with the directions of up, down, left and right of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.
The terms "mounted", "connected", "fixed", and the like in the present application should be understood broadly, and for example, the terms "mounted", "connected", and "fixed" may be fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As introduced in the background art, the defects of too little exhaust steam of cooling of a circulating water system and potential safety hazard of running of the cooling water system exist in the prior art, and the invention provides a turbine circulating cooling water system and a running method thereof in order to solve the technical problems.
The first embodiment is as follows:
the invention is described in detail below with reference to fig. 1, specifically, the structure is as follows:
the embodiment discloses a turbine circulating cooling water system, which comprises a condenser 15, a cooling tower 16, a forebay 17, a first circulating pipeline and a second circulating pipeline, wherein the condenser 15 is connected with the forebay 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 circulating pumps 20 are connected in parallel between the first circulating pipeline and the forebay 17, the first circulating pipeline is connected with a water return branch I21 for circulating cooling water of the auxiliary machinery before the machine to flow in, the second circulating pipeline is connected with a connecting branch III26, and the circulating water is supplied with auxiliary machinery cooling water such as an air cooler, an oil cooler, open water, a water injection tank and the like through the connecting branch III 26.
Specifically, the first circulation pipeline comprises a connecting branch I23, and circulating water is connected to the condenser 15 through the connecting branch I23. An electric valve V9 is installed on the connecting branch I23, and the connecting branch I23 is connected with a circulating pump I18 and a circulating pump II19 which are connected in parallel; an electric valve I1 is arranged between the circulating pump I18 and the forebay 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 forebay 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, and the lift of the bypass circulating pump 20 is generally not less than the circulating pump II19 and not more than the circulating pump I18, and can also be slightly more than the circulating pump I18 and does not exceed the allowable pressure of a pipeline. The flow of the bypass circulating pump 20 is about 5% to 10% of the minimum flow of the circulating pump II19, the appropriate sewage treatment amount and about 60 times of the steam discharge amount of the low-pressure cylinder needing circulating water cooling, and the flow can be set according to actual requirements.
A manual valve I5 and an electric valve V are arranged between the bypass circulating pump 20 and the forebay 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 electric valve II2, the electric valve IV4 and the electric valve V7 are connected to the same end of the connecting branch I, and two branches are connected between the electric valve V9 and the electric valves II2, IV4 and V7, namely: a water supply branch I22 and a water return branch I21, wherein a manual valve II8 is arranged on the water return branch I21.
The second circulation pipeline comprises a connecting 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 connecting branch II 24. Be equipped with motorised valve VI10 on the connecting branch II24, connecting branch II24 one side is connected to cold water tower 16 through connecting branch VI29, and the circulating water passes through connecting branch VI29 to this computer pond, and installs motorised valve VII on connecting branch VI 29.
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 return water pipeline from the auxiliary machine cooling water to the circulating water, and the auxiliary machine cooling water is connected to the pre-machine pool 16 through a connecting branch III 26; a manual valve IV is arranged on the connecting branch IV27, a return water branch II25 for the inflow of auxiliary machine cooling water is connected between the connecting branch III26 and the connecting branch IV27, and a manual valve III11 is installed on the connecting branch III 26; and the connecting branch III26 is connected with the connecting branch IV27 through a connecting branch V28 and the cold water tower 16, the auxiliary machine cooling water is sent to the water tank of the machine through a connecting branch V28, and a manual valve V13 is arranged on the connecting branch V28.
The number of the bypass circulation pumps 20 may be one, two or more, and a plurality of bypass circulation pumps 20 are used as a backup for each other, because the flow rate of the pump is small, the added cost and operation are small. The electric valves V9 and VI10 are circulating water electric valves close to the condenser 15, and are 2 times as many as the number of low-pressure cylinders, and in this embodiment, 2 low-pressure cylinders are provided, but it is understood that in other embodiments, 4 or 8 low-pressure cylinders may be provided.
Compared with the original circulating water system, the bypass circulating pump 20, the water return branch I21, the connecting branch III26, the connecting branch IV27 and related valves are added, when the unit operates in a non-heating period, the original circulating water system is kept normal, the bypass circulating pump 20 is powered off, and the hand valve I5, the electric valve V7, the hand valve II8, the hand valve III11 and the hand valve IV12 are closed.
This embodiment steam turbine recirculating cooling water system can handle the steam turbine low pressure jar and reduce till zero original recirculating cooling water system steam extraction by a wide margin, and the unit heats the time low vacuum mode down the operation:
the low-pressure cylinder exhaust steam heating heat supply main pipe network adopts the prior art as the operation mode of the main pipe network, and the details are not repeated here. The original circulating water is not supplied to the condenser 15, and the electric valve V9 and the electric valve VI10 are closed.
If the running of the unit is ensured by the return water branch I21 and the connecting branch III26, the temporary circulating pump must run normally, and a standby circulating pump is provided. Because the through flow of the water supply branch I22 and the water return branch II25 is relatively small, the circulating pump I18 and the circulating pump II19 are powered off (generally, the circulating pump I18 and the circulating pump II19 are not standby, even if the circulating pump I is standby, the pressure is too high after the circulating pump I is started, the damage to equipment is large, and if the circulating pump I is connected with a mother pipe of a thick pipeline which is on the head of a user, the water quantity.
The electric valve I2, the electric valve II2, the electric valve III3 and the electric valve IV4 are closed to power off, the bypass circulating pump 20 is in hot standby, the manual valve I5 is opened, and the electric valve V7 is in a closed state in an electrified switching interlocking mode; and when the manual valve II8 and the manual valve III11 are opened, the manual valve IV12 and the manual valve V13 are closed, part of the auxiliary machine cooling water is consumed and used, and the other part of the auxiliary machine cooling water returns to the pre-machine pool 17 through the water return branch II25 and the connecting branch III 26.
When the machine is in fault, the circulating water can not normally run, for example, two circulating pumps can not be normally used. Because the vacuum of the machine is not affected, a certain accident handling time is provided. And immediately starting the bypass circulating pump 20, starting the electric valve V7 in a linkage manner, and closing the electric valve related to the circulating water close to the machine, so that the water return branch I does not flow backwards. And (4) opening the manual valve V13, and closing the manual valve II8 and the manual valve III 11.
If the water return branch I21 and the connecting branch III26 are not used or 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, part of cooling water of the auxiliary machine is consumed and used, and part of the cooling water returns to the water tank 17 of the cooling water tower through the water return branch II25 and the connecting branch V28.
The environmental temperature is lower in the ordinary heating period, the water in the water tower pool can be cooled by natural heat dissipation, if the cooling effect is not ideal, the manual valve IV12 can be opened, the manual valve V13 can be closed, and the flow of the upper part of the cooling tower 16 can be adjusted by the electric valve VII 14 to control the water temperature.
Example two:
as shown in fig. 2, compared with the first embodiment, this embodiment does not have the connecting branch IV27 and the manual valve IV12, and other structures are the same, and are not described herein again.
The high back pressure (little or no low pressure cylinder steam discharge) or low pressure cylinder cutting mode of the unit heating period is operated:
the low-pressure cylinder rotor can be an optical axis and can also be a moving blade, and the temperature of the low-pressure cylinder rotor is ensured to be above the brittle transition temperature because a small part of steam is required to warm the low-pressure cylinder rotor during the optical axis. When moving blades are arranged, a small part of steam is needed to take away the heat of blast action, and a low-pressure cylinder has a small amount of exhausted steam. When the system is operated in the mode, the electric valve V9 and the electric valve VI10 are required to be opened, and the opening degree is controlled according to actual needs to ensure the cooling water of the auxiliary machine.
If the backwater branch I21 and the connecting branch III26 are used for ensuring that the unit runs, a machine-approaching circulating pump must run normally, a standby circulating pump is provided, the circulating pump I18 and the circulating pump II19 are electrified and hot for standby, the electric valve I1 and the electric valve III3 are opened, and the electric valve II2 and the electric valve IV4 are electrified and interlocked to be in a closed state. The bypass circulating pump is in hot standby, the manual valve I5 is opened, and the electric valve V7 is closed in an electrified way; and when the manual valve II8 and the manual valve III11 are opened, the manual valve V13 is closed, part of the auxiliary machine cooling water is consumed and used, and part of the auxiliary machine cooling water returns to the pre-machine pool 17 through the water return branch II25 and the connecting branch III 26.
When the machine is in fault, the circulating water can not normally run, for example, two circulating pumps can not be normally used. Because the local vacuum is affected, the incident processing time is somewhat less. And immediately starting the bypass circulating pump 20, starting the electric valve V7 in a linkage manner, and closing the electric valve related to the machine-approaching circulating water system to prevent the water return branch I from flowing backwards. And (4) opening the manual valve V13, and closing the manual valve II8 and the manual valve III 11.
And part of the auxiliary machine cooling water is consumed and used, and the other part of the auxiliary machine cooling water returns to the water tank of the cooling water tower of the machine through the water return branch II25 and the connecting branch V28. The water temperature is controlled by regulating the flow rate of the connecting branch II24 to the upper part of the cooling tower 16 by using an electric valve VII 14. When the bypass circulating pump 20 has a fault, the circulating pump II19 for putting hot standby is started, the associated lock valve is opened or closed, when the circulating pump II19 has a fault, the circulating pump I18 is put in, and when the circulating pump I18 has a fault again and no available circulating water exists, the unit is switched on and shut down.
If the water return 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 the auxiliary machine cooling water is consumed and used, and the other part of the auxiliary machine cooling water returns to the water pool of the cooling tower 16 through a water return branch II25 and a connecting branch V28.
The water temperature is controlled by adjusting the flow rate of the upper part of the water removal cooling tower 16 through an electric valve VII 14. When the bypass circulating pump 20 has a fault, the circulating pump II19 for putting hot standby is started, the associated lock valve is opened or closed, when the circulating pump II19 has a fault, the circulating pump I18 is put in, and when the circulating pump I18 has a fault again and no available circulating water exists, the unit is switched on and shut down.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A turbine circulating cooling water system comprises a condenser, a cooling tower and a forebay, and is characterized in that the condenser is connected with the forebay 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 front pool, a manual valve I and an electric valve V are respectively installed on two sides of each bypass circulating pump, and a check valve is installed between each bypass circulating pump and the electric valve V; the first circulating pipeline is connected with a water return branch I for circulating cooling water of the auxiliary machinery before the aircraft to flow in;
and the second circulating pipeline is connected with a connecting branch III which is used for cooling water of the auxiliary machine to reach a machine-approaching forebay.
2. The steam turbine recirculating cooling water system of claim 1, wherein the first circulating line comprises a connecting branch I, and the connecting branch I is connected with a circulating pump I and a circulating pump II which are connected in parallel with each other;
the bypass circulating pump is connected with the circulating pump I and the circulating pump II in parallel, the return water branch I is connected with the connecting branch I, and a manual valve II is arranged between the return water branch I and the connecting branch I.
3. The steam turbine recirculating cooling water system of claim 2, wherein the head of the bypass circulating pump is not less than circulating pump II and not more than circulating pump I.
4. The steam turbine circulating cooling water system as claimed in claim 2, wherein the second circulating 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 the return water branch II between the connecting branch IV, and the connecting branch III is connected with the cooling water tower through a connecting branch V between the connecting branch IV.
5. The turbine recirculating cooling water system as claimed in claim 4, wherein 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 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 forebay, 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; and a manual valve V is arranged on the connecting branch V, and a manual valve III is arranged on the connecting branch III.
6. The steam turbine circulating cooling water system as claimed in claim 2, wherein the second circulating 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 a connecting branch V, the connecting branch V is connected with a return water branch II, and the connecting branch V is connected with the return water branch II and the connecting branch III.
7. The turbine recirculating cooling water system of claim 6, wherein 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 forebay, 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; and a manual valve V is arranged on the connecting branch V, and a manual valve III is arranged on the connecting branch III.
8. The operating method of a turbine recirculating cooling water system as claimed in claim 5, wherein when the unit is operated in the low vacuum mode during the heating period, the electric valve V and the electric valve VI are closed, and the following operating modes can be selected:
1) the water return branch I and the connection branch III are used for ensuring that the unit runs, the electric valve I, the electric valve II, the electric valve III and the electric valve IV are closed, the bypass circulating pump is in hot standby, the manual valve I is opened, and the electric valve V is in a closed state in a live-line switching interlocking mode; the manual valve II and the manual valve III are opened, the manual valve IV and the manual valve V are closed, part of the auxiliary machine cooling water is consumed, and part of the auxiliary machine cooling water returns to the front pool of the next machine through the water return branch II and the connecting branch III;
2) when the water return branch I and the connecting 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, part of cooling water of the auxiliary machine is consumed and used, and the other part of the cooling water returns to the water pool of the cooling water tower through the water return branch II and the connecting branch V.
9. The method of claim 7, wherein when the turbine cycle cooling water system is operated in the high back pressure mode during the heating period of the turbine, the electric valve V and the electric valve VI are opened, and the following operation modes can be selected:
1) the water return branch I and the connection branch III are used for ensuring that the unit runs, the circulating pump I and the circulating pump II are electrically heated for standby, the electric valve I and the electric valve III are opened, and the electric valve II and the electric valve IV are electrically switched and interlocked 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 way; the manual valve II and the manual valve III are opened, the manual valve V is closed, part of the auxiliary machine cooling water is consumed and used, and the other part of the auxiliary machine cooling water returns to the pre-machine pool through the water return branch II and the connecting branch III;
2) when the water return branch I and the connecting 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 a linkage manner in an electrified manner; and part of the cooling water of the auxiliary machine is consumed and used, and the other part of the cooling water returns to the water pool of the cooling tower through the water return branch II and the connecting branch V.
10. The method for operating a steam turbine recirculating cooling water system as claimed in claim 8 or 9, wherein the water temperature is controlled by adjusting the amount of the upper flow of the water cooling tower using a power door VII; when bypass circulating pump trouble, start the circulating pump II that drops into hot reserve, when circulating pump II trouble, drop into circulating pump I, when circulating pump I trouble no available circulating water again, the unit is opened a floodgate and 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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| WO2021073556A1 (en) * | 2019-10-15 | 2021-04-22 | 中国电建集团山东电力建设第一工程有限公司 | Steam turbine circulating cooling water system and operating method therefor |
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| CN110656986B (en) | 2024-01-19 |
| WO2021073556A1 (en) | 2021-04-22 |
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