CN109899203B - Anti-condensation method and system for air cooler of water turbine generator set - Google Patents
Anti-condensation method and system for air cooler of water turbine generator set Download PDFInfo
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- CN109899203B CN109899203B CN201910043014.4A CN201910043014A CN109899203B CN 109899203 B CN109899203 B CN 109899203B CN 201910043014 A CN201910043014 A CN 201910043014A CN 109899203 B CN109899203 B CN 109899203B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention relates to the technical field of dehumidification and condensation prevention, in particular to an intelligent condensation prevention method and system for an air cooler of a water turbine generator set. By adopting the method and the system, on the premise of effectively ensuring the normal operation of the generator set, the waste of water is reduced, the use of a dehumidifier is effectively reduced under the condition of ensuring that the air cooler does not dew, and the waste of a large amount of resources is reduced.
Description
Technical Field
The invention relates to the technical field of dehumidification and condensation prevention, in particular to an intelligent condensation prevention method and system for an air cooler of a water-turbine generator set.
Background
The hydropower station is below a waterline in the water-blocking dam, the environmental temperature in a factory building is low, the moisture content is usually large, the metal pipeline is easy to rust due to serious condensation, and meanwhile, an electric control system is easy to break down due to the humid environment.
Especially, the dew in the generator enters the air duct under the carrying of the circulating air flow, which can reduce the insulation level of the electrical equipment and accelerate the aging of electrical components.
The condensation also affects the reliable and safe operation of electrical equipment, and leads to the shutdown maintenance of the equipment when the condensation is serious, so that the production, maintenance and repair costs are increased, and the factors seriously restrict the improvement of the benefits of the hydraulic power plant.
The air cooler is used for cooling a stator winding and an iron core of the generator in a hydropower station and plays an important role in normal operation of the generator, but the dewing phenomenon of the air cooler is serious in some times, the dewing amount of each air cooler is about 10Kg every day in serious cases, but the dewing phenomenon does not occur at any time, and a large amount of energy is consumed if dehumidification equipment is started all the time.
Disclosure of Invention
The invention aims to provide an intelligent anti-condensation method for an air cooler of a water turbine generator set, which can effectively ensure the normal operation of a generator and can realize intelligent dehumidification.
In order to achieve the aim of the invention, the intelligent anti-condensation method for the hydroelectric generating set comprises the following steps of detecting whether the temperature of an iron core is higher than a set safe temperature or not, if so, adjusting the flow of an air cooler to be maximum, and if not, performing the following steps:
a. data acquisition: collecting relative humidity in an upwind tunnel, temperature of the pipe wall of a water inlet pipe of an air cooler, air temperature in the air cooler, water flow of the air cooler and unit load;
b. calculating the required flow: the required flow in the air cooler tubes is calculated as follows,
wherein:
t outlet air: the temperature of the air in the air cooler,
t inlet cooling water: the temperature of the pipe wall of the water inlet pipe of the air cooler,
q V: the flow rate required in the air cooler tubes at the current unit load,
p: the unit load is provided with data by the LCU cabinet of the corresponding unit,
η c ρ: these three parameters are constants:
η: indicating the operating efficiency of the air cooler (%)
c: represents the specific heat capacity of water (J/kg. Degree. C.)
ρ: denotes the density (kg/m 3) of the cooling water
c. Flow and anti-condensation control: and (b) comparing the flow required in the air cooler pipeline obtained by the calculation in the step (2) with the flow of the air cooler collected in the step (a), further adjusting the flow of the air cooler, calculating an environment dew point value by using the relative humidity in the upwind tunnel, starting the dehumidifier for 20-40 min if the environment dew point value is greater than the temperature of the wall of the air cooling water pipe, and not starting the dehumidifier if the environment dew point value is less than the temperature of the wall of the air cooling water pipe.
Further, the set safe temperature is not higher than 85 ℃, and preferably, the set safe temperature is 85 ℃.
Further, in the step a, a dew point sensor is adopted to collect the pneumatic relative humidity, the sensor can automatically calculate a dew point value corresponding to the relative humidity, and preferably, the dew point sensor is DMT143L.
Further, in the step a, a patch type temperature sensor is adopted to collect the temperature of the pipe wall of the water inlet pipe of the air cooler, and preferably, the patch type temperature sensor adopts SA2C-RTD-3-100-A-80.
Further, in the step a, a gas measurement RTD sensor is adopted to measure the temperature of the air in the air cooler, preferably, the gas measurement RTD sensor is P-L-1/10-M60-150-M8-P-1.
Further, in the step a, the air cooler water flow rate is measured by using an ultrasonic flow meter, and preferably, the ultrasonic flow meter uses FDT-47.
Further, the water flow of the air cooler is controlled by a throttle valve, and the throttle valve is automatically controlled.
Preferably, in the step c, if the ambient dew point value is greater than the temperature of the air cooling water pipe wall, the dehumidifier is started for 30min.
The intelligent anti-condensation system of the air cooler of the water-turbine generator set based on the intelligent anti-condensation method of the air cooler of the water-turbine generator set comprises the following steps: the device comprises a dew point sensor, a surface mount type temperature sensor, a gas measurement RTD sensor, a flowmeter, a controller, a dehumidifier and a throttle valve, wherein signal output ends of the dew point sensor, the surface mount type temperature sensor, the gas measurement RTD sensor and the flowmeter are connected with a signal input end of a control system, a signal output end of the controller is connected with the dehumidifier and the throttle valve, and the controller is in signal connection with an LCU cabinet of a generator set.
Further, the controller adopts a PLC system, and preferably, the controller adopts a Schneider PLC M340 series.
Furthermore, the controller corresponds to a plurality of air coolers of the same generator set.
The method can accurately control the flow of the pipeline of the air cooler, reduce the waste of water on the premise of effectively ensuring the normal operation of the generator set, and simultaneously effectively reduce the use of a dehumidifier on the premise of ensuring that the air cooler does not dew, thereby reducing the waste of a large amount of resources. The system of the invention can automatically realize the method.
Drawings
FIG. 1 is a flow chart of an intelligent anti-condensation method for an air cooler of a water turbine generator set, provided by the invention;
fig. 2 is a structural diagram of an intelligent anti-condensation system of an air cooler of a water turbine generator set.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings. Example 1: an intelligent anti-condensation method for a hydroelectric generating set comprises the steps of detecting whether the temperature of an iron core is higher than 85 ℃, adjusting the flow of an air cooler to the maximum value if the temperature of the iron core is higher than 85 ℃, and performing the following steps if the temperature of the iron core is lower than 85 ℃:
a. data acquisition: collecting relative humidity in an upper wind tunnel, temperature of a pipe wall of a water inlet pipe of an air cooler, air temperature in the air cooler, water flow of the air cooler and unit load;
b. calculating the required flow: the required flow in the air cooler tubes is calculated as follows:
t outlet air: the temperature of the air in the air cooler,
t inlet cooling water: the temperature of the pipe wall of the water inlet pipe of the air cooler,
q V: the flow rate required in the air cooler tubes at the current unit load,
p: the unit load is provided with data by the LCU cabinet of the corresponding unit,
η c ρ: these three parameters are constants:
eta: indicating the operating efficiency of the air cooler (%)
c: represents the specific heat capacity of water (J/kg. Degree. C.)
ρ: shows the density (kg/m 3) of the cooling water
c. Flow and anti-condensation control: and c, comparing the flow required in the air cooler pipeline obtained by the calculation in the step 2 with the flow of the air cooler collected in the step a, further adjusting the flow of the air cooler, calculating an environment dew point value by using the relative humidity in the upwind tunnel, starting the dehumidifier for 30min if the environment dew point value is greater than the temperature of the air cooling water pipe wall, and not starting the dehumidifier if the environment dew point value is less than the temperature of the air cooling water pipe wall.
In the step a, a dew point sensor is adopted to collect the pneumatic relative humidity, and the sensor can automatically calculate the corresponding dew point value of the relative humidity; collecting the temperature of the pipe wall of the water inlet pipe of the air cooler by adopting a surface mount type temperature sensor; measuring the air temperature in the air cooler by using a gas measurement RTD sensor; an ultrasonic flow meter was used to measure air cooler water flow.
The water flow of the air cooler is controlled by a throttle valve, and the throttle valve is automatically controlled. Example 2: an intelligent anti-condensation method for a hydroelectric generating set comprises the steps of detecting whether the temperature of an iron core is more than 83 ℃, adjusting the flow of an air cooler to be maximum if the temperature of the iron core is more than 83 ℃, and performing the following steps if the temperature of the iron core is less than 83 ℃:
a. data acquisition: collecting relative humidity in an upper wind tunnel, temperature of a pipe wall of a water inlet pipe of an air cooler, air temperature in the air cooler, water flow of the air cooler and unit load;
b. calculating the required flow: the required flow in the air cooler tubes is calculated as follows, wherein:
t outlet air: the temperature of the air in the air cooler,
t inlet cooling water: the temperature of the pipe wall of the water inlet pipe of the air cooler,
q V: the flow rate required in the air cooler tubes at the current unit load,
p: the unit load is provided by the LCU cabinet of the corresponding unit,
η c ρ: these three parameters are constants:
eta: the working efficiency of the air cooler (%)
c: represents the specific heat capacity of water (J/kg. Degree. C.)
ρ: denotes the density (kg/m 3) of the cooling water
c. Flow and anti-condensation control: and (b) comparing the flow required in the air cooler pipeline obtained by the calculation in the step (2) with the flow of the air cooler collected in the step (a) to further adjust the flow of the air cooler, calculating an environment dew point value by using the relative humidity in the upwind tunnel, starting the dehumidifier for 40min if the environment dew point value is greater than the temperature of the wall of the air cooling water pipe, and not starting the dehumidifier if the environment dew point value is less than the temperature of the wall of the air cooling water pipe.
The water flow of the air cooler is controlled by a throttle valve, and the throttle valve is automatically controlled. Example 3: an intelligent anti-condensation method for a hydroelectric generating set comprises the steps of detecting whether the temperature of an iron core is higher than 80 ℃, adjusting the flow of an air cooler to the maximum value if the temperature of the iron core is higher than 80 ℃, and performing the following steps if the temperature of the iron core is lower than 80 ℃:
a. data acquisition: collecting relative humidity in an upper wind tunnel, temperature of a pipe wall of a water inlet pipe of an air cooler, air temperature in the air cooler, water flow of the air cooler and unit load;
b. and (3) calculating the required flow: the required flow in the air cooler tubes is calculated as follows, wherein:
t outlet air: the temperature of the air in the air cooler,
t inlet cooling water: the temperature of the pipe wall of the water inlet pipe of the air cooler,
q V: the flow rate required in the air cooler tubes at the current unit load,
p: the unit load is provided by the LCU cabinet of the corresponding unit,
η c ρ: these three parameters are constants:
eta: indicating the operating efficiency of the air cooler (%)
c: represents the specific heat capacity of water (J/kg. Degree. C.)
ρ: denotes the density (kg/m 3) of the cooling water
c. Flow and anti-condensation control: and c, comparing the flow required in the air cooler pipeline obtained by the calculation in the step 2 with the flow of the air cooler collected in the step a, further adjusting the flow of the air cooler, calculating an environment dew point value by using the relative humidity in the upwind tunnel, starting the dehumidifier for 20min if the environment dew point value is greater than the temperature of the air cooling water pipe wall, and not starting the dehumidifier if the environment dew point value is less than the temperature of the air cooling water pipe wall.
In the step a, a dew point sensor is adopted to collect the upper pneumatic relative humidity, and the sensor can automatically calculate the dew point value corresponding to the relative humidity.
Example 4: an intelligent moisture condensation prevention system for an air cooler of a water turbine generator set comprises: the system comprises a dew point sensor DMT143L, a patch type temperature sensor SA2C-RTD-3-100-A-80, a gas measurement RTD sensor P-L-1/10-M60-150-M8-P-1, an ultrasonic flowmeter FDT-47, a controller, a dehumidifier and a throttle valve, wherein signal output ends of the dew point sensor, the patch type temperature sensor, the gas measurement RTD sensor and the ultrasonic flowmeter are connected with a signal input end of a control system, a signal output end of the controller is connected with a dehumidifier CF-B158L/D and the throttle valve, and the controller is in signal connection with an LCU cabinet of a generator set.
The controller adopts a PLC system, and preferably, the controller adopts a Schneider PLC M340 series.
The controller corresponds to a plurality of air coolers of the same generator set.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made within the spirit and the principle of the present invention, and these equivalent modifications and substitutions are included in the scope of the present invention.
Claims (10)
1. An intelligent anti-condensation method for an air cooler of a water turbine generator set is characterized in that: the method comprises the following steps of detecting whether the temperature of an iron core is greater than a set safe temperature, adjusting the flow of an air cooler to the maximum if the temperature of the iron core is greater than the set safe temperature, and performing the following steps if the temperature of the iron core is less than the set safe temperature:
a. data acquisition: collecting relative humidity in an upper wind tunnel, temperature of a pipe wall of a water inlet pipe of an air cooler, air temperature in the air cooler, water flow of the air cooler and unit load;
b. calculating the required flow: the required flow in the air cooler tubes is calculated as follows,
wherein:
t outlet air: the temperature of the air in the air cooler,
t inlet cooling water: the temperature of the pipe wall of the water inlet pipe of the air cooler,
q v: the flow rate required in the air cooler tubes at the current unit load,
p: the unit load is provided by the LCU cabinet of the corresponding unit,
η c ρ: these three parameters are constants:
eta: indicating the operating efficiency of the air cooler (%)
c: represents the specific heat capacity of water (J/kg. Degree. C.)
ρ: denotes the density (kg/m 3) of the cooling water
c. Flow and anti-condensation control: and (b) comparing the flow required in the air cooler pipeline obtained by the calculation in the step (2) with the flow of the air cooler collected in the step (a), further adjusting the flow of the air cooler, calculating an environment dew point value by using the relative humidity in the upwind tunnel, starting the dehumidifier for 20-40 min if the environment dew point value is greater than the temperature of the wall of the air cooling water pipe, and not starting the dehumidifier if the environment dew point value is less than the temperature of the wall of the air cooling water pipe.
2. The intelligent anti-condensation method for the air cooler of the water turbine generator set according to claim 1, characterized in that: in the step a, a dew point sensor is adopted to collect the pneumatic relative humidity, and the sensor can automatically calculate the dew point value corresponding to the relative humidity.
3. The intelligent anti-condensation method for the air cooler of the water turbine generator set according to claim 1, characterized in that: and in the step a, a surface mount type temperature sensor is adopted to collect the temperature of the pipe wall of the water inlet pipe of the air cooler.
4. The intelligent anti-condensation method for the air cooler of the water turbine generator set according to claim 1, characterized in that: in the step a, the temperature of the air in the air cooler is measured by adopting a gas measurement RTD sensor.
5. The intelligent anti-condensation method for the air cooler of the water turbine generator set according to claim 1, characterized in that: in the step a, the water flow of the air cooler is measured by adopting an ultrasonic flowmeter, and the ultrasonic flowmeter adopts FDT-47.
6. The intelligent anti-condensation method for the air cooler of the water turbine generator set according to claim 1, characterized in that: and the water flow of the air cooler is controlled by a throttle valve.
7. The intelligent anti-condensation method for the air cooler of the water turbine generator set according to claim 1, characterized in that: and c, starting the dehumidifier for 30min if the environmental dew point value is greater than the temperature of the wall of the air cooling water pipe.
8. The intelligent anti-condensation system of the air cooler of the water turbine generator set based on the intelligent anti-condensation method of the air cooler of the water turbine generator set according to any one of claims 1 to 7, is characterized by comprising the following steps of: the system comprises a dew point sensor, a surface mount type temperature sensor, a gas measurement RTD sensor, a flowmeter, a controller, a dehumidifier and a throttle valve, wherein signal output ends of the dew point sensor, the surface mount type temperature sensor, the gas measurement RTD sensor and the flowmeter are connected with a signal input end of a control system, a signal output end of the controller is connected with the dehumidifier and the throttle valve, and the controller is in signal connection with an LCU cabinet of a generator set.
9. The intelligent anti-condensation system of the air cooler of the water turbine generator set according to claim 8, characterized in that: the controller adopts a PLC system.
10. The intelligent anti-condensation system of the air cooler of the water turbine generator set according to claim 8, characterized in that: the controller corresponds to a plurality of air coolers of the same generator set.
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| KR101908867B1 (en) * | 2017-12-05 | 2018-12-18 | (주)큰나무 | Small Hydro Power Device using waterworks |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CH636737A5 (en) * | 1977-11-21 | 1983-06-15 | Kraftwerk Union Ag | METHOD AND DEVICE FOR DETERMINING COOLING WATER LEAKAGE ON ELECTRICAL MACHINES. |
| JPH0837761A (en) * | 1994-07-26 | 1996-02-06 | Fuji Electric Co Ltd | Device for preventing drying and dew condensation of rotating electric nachine |
| CN2458809Y (en) * | 2000-12-15 | 2001-11-07 | 天津市净化设备厂 | Air passage mechanism for hydrogen circulation drier |
| CN101251282A (en) * | 2008-04-03 | 2008-08-27 | 东南大学 | Water chilling unit based on hot moisture independent process as well as air-treatment method thereof |
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| KR101908867B1 (en) * | 2017-12-05 | 2018-12-18 | (주)큰나무 | Small Hydro Power Device using waterworks |
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