CN217303640U - Power plant circulating water inlet temperature automatic regulating system - Google Patents
Power plant circulating water inlet temperature automatic regulating system Download PDFInfo
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- CN217303640U CN217303640U CN202123018346.9U CN202123018346U CN217303640U CN 217303640 U CN217303640 U CN 217303640U CN 202123018346 U CN202123018346 U CN 202123018346U CN 217303640 U CN217303640 U CN 217303640U
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
The utility model discloses an automatic temperature regulating system for a circulating water inlet of a power plant, which comprises a cooling water tower, a water collecting device and a water inlet, wherein the cooling water tower comprises an internal spraying system and the water collecting device is positioned below the spraying system; the circulating system comprises a water injection pipeline communicated with the spraying system and a water return pipeline communicated with the water collecting device; the bypass system comprises a bypass pipeline and a bypass valve on the bypass pipeline, and the bypass pipeline is used for communicating the water injection pipeline with the water collecting device; wherein the bypass valve is a normally closed valve. The utility model discloses a system for adjust circulating water inlet temperature through automatic control circulating water return bypass valve opening degree has avoided the frozen insecurity that brings of water tower, has improved unit economic nature.
Description
Technical Field
The utility model belongs to the technical field of the energy utilization, concretely relates to circulating water inlet temperature automatic regulating system of power plant.
Background
At present, for a wet-cold thermal power generating unit adopting a hyperbolic natural draft cooling tower, in order to avoid freezing of the cooling tower in winter, the safety and the economical efficiency of the unit are ensured by controlling the temperature of a circulating water inlet within a proper range, a louver type wind shield is frequently used, and the temperature of the circulating water inlet is adjusted by changing the angle of a louver.
However, in northern areas, the environmental temperature can reach-30 ℃ in extremely cold weather in winter, and even if all the shutters are closed, the temperature of the circulating water inlet is still lower than the minimum specified value and cannot meet the requirement of the temperature of the circulating water inlet, so that a water tower is frozen, and the safe operation of a unit is seriously influenced.
SUMMERY OF THE UTILITY MODEL
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract of the specification and the title of the application to avoid obscuring the purpose of this section, the abstract of the specification and the title of the application, and such simplifications or omissions are not intended to limit the scope of the invention.
In view of above-mentioned and/or among the prior art when the water tower shutter can't satisfy the extremely cold weather in northern area winter circulating water entry temperature requirement and the problem of the frost-proof requirement of water tower, the utility model provides a power plant's circulating water entry temperature automatic regulating system.
The utility model aims at providing a power plant's circulating water inlet temperature automatic regulating system controls circulating water inlet temperature through adjusting circulating water return bypass valve opening, when the shutter is whole to be closed back circulating water inlet temperature still is less than the requirement, starts this governing system, adjusts circulating water inlet temperature.
In order to solve the technical problem, the utility model provides a following technical scheme: an automatic regulating system for the temperature of a circulating water inlet of a power plant comprises,
a cooling water tower comprising an internal spray system and a water collection device located below the spray system;
the circulating system comprises a water injection pipeline communicated with the spraying system and a water return pipeline communicated with the water collecting device; and the number of the first and second groups,
the bypass system comprises a bypass pipeline and a bypass valve on the bypass pipeline, and the bypass pipeline is used for communicating the water injection pipeline with the water collecting device;
wherein the bypass valve is a normally closed valve.
As the utility model discloses power plant's circulating water entry temperature automatic regulating system's an preferred scheme, wherein: also comprises a control system, which comprises,
the temperature sensor is used for detecting the temperature in the water injection pipeline; and the number of the first and second groups,
a processor electrically connected to the temperature sensor and the bypass valve.
As the utility model discloses power plant's circulating water entry temperature automatic regulating system's an preferred scheme, wherein: the processor is also electrically connected with an opening and closing controller of a shutter in the cooling water tower.
As the utility model discloses power plant's circulating water entry temperature automatic regulating system's an preferred scheme, wherein: the control system further comprises an alarm connected with the processor, and the alarm comprises one of a warning lamp, a buzzer and an audible and visual alarm.
As the utility model discloses power plant's circulating water entry temperature automatic regulating system's an preferred scheme, wherein: the circulating system is connected with the condenser, the water injection pipeline is connected with a heat exchange outlet of the condenser, and the water return pipeline is connected with a heat exchange inlet of the condenser.
As the utility model discloses power plant's circulating water entry temperature automatic regulating system's an preferred scheme, wherein: the control system further comprises a pressure sensor connected with the processor, and the pressure sensor is used for detecting the vacuum degree in the condenser.
Compared with the prior art, the utility model discloses following beneficial effect has:
for a wet cooling unit adopting a hyperbolic natural draft cooling water tower in northern areas, both an artificial wind shield and a shutter type wind shield can not meet the anti-freezing requirement of the water tower in extremely cold weather in winter, and the water tower can still freeze even if the circulating water inlet temperature is still very low after the wind shields are completely closed. Therefore, the utility model discloses a system for adjust circulating water inlet temperature through automatic control circulating water return bypass valve opening degree has avoided the frozen insecurity that brings of water tower, has improved unit economic nature.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor. Wherein:
fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is the schematic diagram of the internal structure of the cooling tower of the present invention.
Fig. 3 is a system block diagram of the control system of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying description.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, the references herein to "one embodiment" or "an embodiment" refer to a particular feature, structure, or characteristic that may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1 and 2, in order to provide a first embodiment of the present invention, the embodiment provides an automatic temperature adjustment system for a circulating water inlet of a power plant, including a cooling tower 100, a circulation system 200 and a bypass system 300, wherein the cooling tower 100 includes an internal spraying system 101 and a water collecting device 102 located below the spraying system 101, the circulation system 200 includes a water injection pipeline 201 communicated with the spraying system 101 and a water return pipeline 202 communicated with the water collecting device 102;
the water injection pipeline 201 sends the circulating water to the central vertical shaft of the cooling water tower 100, the circulating water is lifted to a water distribution platform of the water tower through the central vertical shaft, the spraying system 101 uniformly distributes the circulating water to a packing layer through a water distribution and splashing device, the circulating water flows from top to bottom in a spraying mode, the water temperature is reduced after heat exchange is carried out on the circulating water and cold air flowing from bottom to top, the circulating water falls into the water collecting device 102 below after being cooled, and the circulating water is discharged by the water return pipeline 202 and is circulated again;
the bypass system 300 comprises a bypass pipeline 301 and a bypass valve 302 arranged on the bypass pipeline 301, the bypass pipeline 301 is used for communicating the water injection pipeline 201 with the water collecting device 102, the bypass pipeline 301 is arranged on the water injection pipeline 201 of the circulating water, and the bypass pipeline 301 does not pass through a central shaft tower, but directly enters the water collecting device 102, so that the heat exchange process with cold air is not carried out in winter, and the situations that the cooling water tower 100 is frozen and a bracket or a packing layer is damaged by pulling due to too low temperature of the circulating water can be prevented.
By controlling the opening of the bypass valve 302 on the bypass line 301, the circulating water inlet temperature can be adjusted.
It should be noted that the bypass valve 302 is a normally closed valve, and is opened only when the water temperature in the water injection pipeline 201 is low in winter, and is closed in other seasons.
Example 2
Referring to fig. 1 to 3, this embodiment is different from the first embodiment in that: in order to put into automatic control in winter and automatically adjust the opening of the circulating water bypass valve 302 according to the program setting, the present embodiment further comprises a control system 400, the control system 400 comprises a temperature sensor 401 and a processor 402, the temperature sensor 401 is used for detecting the temperature in the water injection pipeline 201, and the processor 402 is electrically connected with the temperature sensor 401 and the bypass valve 302.
When the temperature sensor 401 detects that the temperature in the water injection pipeline 201 is lower than the first preset value and still has a downward trend, the processor 402 sends an instruction to open the bypass valve 302, the bypass valve 302 is opened, and the system enters an anti-freezing mode.
When the temperature sensor 401 detects that the temperature in the water injection line 201 is higher than the second preset value and still has an upward trend, the processor 402 sends an instruction to close the bypass valve 302, the bypass valve 302 is closed, and the anti-freeze mode exits.
The first preset value and the second preset value can be adjusted according to actual conditions, and in northern areas, the first preset value can be set to be 3 ℃, and the cooling water tower 100 is very easy to freeze when the temperature is lower than 3 ℃, so that the safety of a unit is influenced; the second preset value can be set to 10 ℃ or higher to meet the requirement of energy saving.
The temperature sensor 401 adopted by the embodiment is an EXTS-312(M) series temperature sensor, the processor 402 adopts an STM32F103C8T6 type single chip microcomputer, and the bypass valve 302 adopts a CWX-15Q/N type electric valve.
Example 3
Referring to fig. 1 to 3, this embodiment is different from the above-described embodiment in that: the processor 402 is also electrically connected to the on/off controller 104 of the louvers 103 in the cooling tower 100.
When the temperature sensor 401 detects that the temperature in the water injection pipeline 201 is lower than the first preset value and still has a downward trend, the processor 402 sends an instruction for closing the shutter 103, the open-close controller 104 closes the shutter 103, and the purpose of preventing the water temperature from decreasing can be achieved by closing the shutter 103 at a certain environmental temperature, so that when the temperature in the water injection pipeline 201 is lower than the first preset value and still has a downward trend after the shutter 103 is completely closed, the regulating system is started to regulate the inlet temperature of the circulating water.
It should be noted that, in order to make the staff know that the system enters the anti-freeze mode at the first time, the control system 400 further includes an alarm 403 connected to the processor 402, and the alarm 403 includes one of a warning light, a buzzer and an audible and visual alarm, preferably an audible and visual alarm capable of simultaneously giving an audible alarm and a visual alarm.
Example 4
Referring to fig. 1 to 3, this embodiment is different from the above-described embodiment in that: the circulating system 200 of this embodiment is connected with the condenser 500, the water injection pipeline 201 is connected with the heat exchange outlet 501 of the condenser 500, the return water pipeline 202 is connected with the heat exchange inlet 502 of the condenser 500, the water of the water collecting device 102 below the cooling water tower 100 of the power plant enters the condenser 500 through the circulating water pump 203, the heat exchange is carried out with the exhaust steam which finishes the work of the steam turbine, the circulating water after the exhaust steam is cooled becomes hot, then the water is sent to the central shaft of the cooling water tower 100 through the water injection pipeline 201, the water goes up to the water tower water distribution platform through the central shaft, the circulating water is uniformly distributed to the packing layer through the water distribution and splashing devices by the spraying system 101, the circulating water flows from top to bottom in a spraying mode, the water temperature drops after the heat exchange is carried out with the cold air flowing from bottom to top, and the water collecting device 102 which falls below after the cooling is circulated again.
In the anti-freezing mode, in order to avoid tripping of the low vacuum protection action of the unit caused by too much vacuum drop of the condenser 500 after the bypass valve 302 is opened and the temperature of the circulating water is increased, the control system 400 further includes a pressure sensor 404 connected to the processor 402, the pressure sensor 404 is used for detecting the vacuum degree in the condenser 500, and the processor 402 is added with logic conditions: when the vacuum of the condenser 500 is less than or equal to-78 kpa, the locked bypass valve 302 is continuously opened, the bypass valve 302 keeps the original opening degree, and meanwhile, an audible and visual alarm is given out to remind an operator to adjust in time (the low vacuum protection action value of the unit is-70 kpa).
The utility model discloses divide into DCS automatically regulated and DSC manually operation. The operation in winter is automatic, the opening degree of the circulating water return bypass valve 302 is automatically adjusted according to the program setting, and the manual operation can be switched to the manual operation under special conditions; the other seasons are switched to manual and the circulating water return bypass valve 302 is closed.
In order to prevent the cooling water tower 100 from being frozen due to low temperature of a circulating water inlet in the running of the unit in winter and influence the safety of the unit, and meanwhile, to prevent the high temperature of the circulating water inlet from causing the vacuum reduction of a condenser 500 and the economic reduction of the unit, the temperature of the circulating water inlet is specially set to be 3-15 ℃, and when the temperature is lower than 3 ℃, the shutters 103 are all closed.
When the automatic circulating water temperature adjusting system detects that the temperature of the circulating water inlet is still lower than 3 ℃ and still has a downward trend after the temperature sensor 401 detects that the shutter 103 is completely closed for 5 minutes, the system enters an anti-freezing mode, and simultaneously gives out an audible and visual alarm, the shutter 103 is automatically switched to be manual and is kept closed, so that the shutter 103 is prevented from being frequently opened and closed due to the fact that the temperature of the circulating water inlet changes around a critical value, and the circulating water return bypass valve 302 is frequently opened and closed.
The system anti-freezing mode is divided into 3, 8 and 15 ℃ adjusting steps, and the steps cannot be changed when other temperature values are dead zones, so that the damage to the bypass valve 302 caused by frequent adjustment of the circulating water return bypass valve 302 and the frequent disturbance to the unit are avoided.
Step one, when the water temperature of the circulating water inlet is detected to reach 3 ℃, the system sends out a pulse instruction that the opening degree of the bypass valve 302 is 100 percent, and the bypass valve 302 is fully opened;
step two, when the temperature of the water at the circulating water inlet is detected to reach 8 ℃, the system sends out a pulse instruction of 50% of the opening of the bypass valve 302;
step three, when the temperature of the water at the circulating water inlet is detected to reach 15 ℃, the system sends out a pulse instruction of 0 percent of the opening of the bypass valve 302, and the bypass valve 302 is completely closed;
and when the temperature of the circulating water inlet reaches 15 ℃ for 5 minutes, the temperature is still higher than 15 ℃ and still has an ascending trend, the anti-freezing mode is quitted, and meanwhile, the system gives out an audible and visual alarm. At this time, the operator switches the shutter 103 regulating system from manual to automatic, and the circulating water inlet water temperature control is switched to shutter 103 regulation by the bypass valve 302 regulation.
In the anti-freezing mode, in order to avoid tripping of the low-vacuum protection action of the unit caused by too much vacuum drop of the condenser 500 after the circulating water return bypass valve 302 is opened and the temperature of circulating water is increased, a logic condition is specially added: when the vacuum of the condenser 500 is less than or equal to-78 kpa, the locked bypass valve 302 is continuously opened, the bypass valve 302 keeps the original opening degree, and meanwhile, an audible and visual alarm is given out to remind an operator to adjust in time.
It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a circulating water of power plant entry temperature automatic regulating system which characterized in that: comprises the steps of (a) preparing a substrate,
a cooling water tower (100) comprising an internal spraying system (101) and a water collection device (102) located below the spraying system (101);
the circulating system (200) comprises a water injection pipeline (201) communicated with the spraying system (101) and a water return pipeline (202) communicated with the water collecting device (102); and the number of the first and second groups,
a bypass system (300) comprising a bypass line (301) and a bypass valve (302) thereon, the bypass line (301) communicating the water injection line (201) with the water collection device (102);
wherein the bypass valve (302) is a normally closed valve.
2. The automatic regulating system for inlet temperature of circulating water of power plant of claim 1, characterized in that: further comprising a control system (400), said control system (400) comprising,
a temperature sensor (401), the temperature sensor (401) being configured to detect a temperature within the water injection line (201); and (c) a second step of,
a processor (402), the processor (402) electrically connected with the temperature sensor (401), the bypass valve (302).
3. The power plant circulating water inlet temperature automatic regulating system of claim 2, characterized in that: the processor (402) is also electrically connected with the opening and closing controller (104) of the shutter (103) in the cooling water tower (100).
4. The automatic regulating system for inlet temperature of circulating water of power plant of claim 3, characterized in that: the control system (400) further comprises an alarm (403) connected with the processor (402), wherein the alarm (403) comprises one of a warning lamp, a buzzer and an audible and visual alarm.
5. The automatic regulating system for inlet temperature of circulating water of a power plant as claimed in any one of claims 2 to 4, characterized in that: the circulating system (200) is connected with the condenser (500), the water injection pipeline (201) is connected with a heat exchange outlet (501) of the condenser (500), and the water return pipeline (202) is connected with a heat exchange inlet (502) of the condenser (500).
6. The automatic regulating system for inlet temperature of circulating water of power plant of claim 5, characterized in that: the control system (400) further comprises a pressure sensor (404) connected with the processor (402), wherein the pressure sensor (404) is used for detecting the vacuum degree in the condenser (500).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123018346.9U CN217303640U (en) | 2021-12-03 | 2021-12-03 | Power plant circulating water inlet temperature automatic regulating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123018346.9U CN217303640U (en) | 2021-12-03 | 2021-12-03 | Power plant circulating water inlet temperature automatic regulating system |
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| Publication Number | Publication Date |
|---|---|
| CN217303640U true CN217303640U (en) | 2022-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123018346.9U Active CN217303640U (en) | 2021-12-03 | 2021-12-03 | Power plant circulating water inlet temperature automatic regulating system |
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| CN (1) | CN217303640U (en) |
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2021
- 2021-12-03 CN CN202123018346.9U patent/CN217303640U/en active Active
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