JPS6340224A - Hot water cleaning of glass - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a hot water cleaning method for insulators for cleaning dirt on the surfaces of insulators in power plants and substations, particularly in cold regions.

(Conventional technology) Normally, when power plants and substations are installed near the coast, the insulating ability of the insulators is significantly reduced due to sea salt adhesion, so to prevent this, clean water is sprayed to clean the insulators. Approximately 1~
It is held regularly every two weeks. In particular, when there is a strong wind from the sea, it gets dirty quickly, so it is necessary to wash it frequently, about every 30 minutes.

However, in cold regions, the water that flows down along the surface of the insulator after water is discharged and the remaining water are cooled by the low-temperature outside air and freeze, making it easy for icicles to grow between the caps of the insulator.

As a result, the leakage distance of the insulator becomes shorter and the insulating ability of the insulator decreases. For this reason, in cold regions, power plants and substations may be installed in inland areas where the surface of the insulators is less contaminated by sea salt and the frequency of cleaning can be reduced, or cleaning may not be necessary at all. Long oversized insulators were used in power plants and substations. However, the above-mentioned solution not only imposes restrictions on the installation of power plants and substations, but also has problems such as the use of excess insulators, which increases the size of the equipment.

Furthermore, in cold regions, the above-mentioned reduction in insulation capacity due to the growth of icicles is a problem that exists not only near the coast but also in power plants and substations in inland areas.

Therefore, as a method that solves the above-mentioned problems and allows insulators to be cleaned even in power plants and substations in cold regions, a cleaning method as shown in FIG. 5, for example, can be considered.

That is, the water in the water storage tank 21 is preheated by the heater 22, and when cleaning the insulator 23, the valves 24 to 26 are opened, and the main pump 27 supplies hot water to the primary main pipe 28, and then the secondary main pipe 29. The hot water is discharged from the nozzle 30 through the nozzle for about 1 to 2 minutes. Like this C two insulators 2
By discharging hot water to the insulator 3, the insulator 23 is cleaned and icicles are prevented from growing in the Kasama of the insulator 23.

(Problems to be Solved by the Invention) However, in the above-described cleaning method, after the hot water is discharged, hot water remains in the primary main pipe 28 and the secondary main pipe 29, so that the residual water is Eventually, it will be cooled by the outside air and turn into cold water or freeze. This means that even if the primary main pipe 28 is buried underground, hot water cannot be maintained for a long time. Therefore, even if hot water is to be discharged next time, the cooled residual water in both the tubes 28 and 29 will be discharged first. On the other hand, since the residual water discharge time takes approximately 0.5 to 2 minutes depending on the length of the pipe, cold water is eventually discharged to the insulator 23.
Unable to prevent icicle growth.

Also, if the residual water in both tubes 28 and 29 freezes,
It becomes difficult to spray water onto the insulator 23.

Therefore, heating the entire pipe with a heater may be considered, but not only is it not easy to control the temperature of the heater, the cost is high, and maintenance and maintenance are labor-intensive. Also, it is possible to drain the water remaining in the two circulation pipes 28 and 29 after cleaning the insulator 23 through the blow valve 31 before the next cleaning, but it will take time to fill the water next time. Not only that, but water is wasted. Furthermore, it is conceivable to lengthen the water discharge time during washing to ensure that hot water is discharged after cold water, but this requires a large amount of water.

This invention was made in view of the above-mentioned circumstances, and is an insulator that can be cleaned without causing icicles to grow between the insulators in power plants and substations in cold regions, and that can prevent the deterioration of the insulating ability of the insulators. The purpose is to provide a hot water cleaning method.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a method for heating circulating water in a primary main pipe piped in a loop shape until it reaches a predetermined temperature using a heating means. The system adopts a configuration in which the circulating water is circulated, and when the warm water reaches a predetermined temperature, the hot water is supplied to the secondary main pipe and the hot water starts cleaning the insulator.

(Function) Therefore, when the circulating water of the primary main pipe is heated by the heating means and becomes hot water of a predetermined temperature, it is supplied to the secondary main pipe, and cleaning of the insulator with the hot water can be started.

(Embodiment) Hereinafter, an embodiment embodying the present invention will be described in detail based on FIGS. 1-2.

As shown in FIG. 1, a heater 2 is provided in a water storage tank 1 installed in a power plant or substation as a means for heating the water in the tank 1. A loop-shaped primary main pipe 8 is connected to the water storage tank 1 via a first valve 3 and a main pump 4, and a second valve 5 for opening and closing the pipeline is connected to the base end of the primary main pipe 8. and a fourth valve 9 are provided. Further, a pipe line 8a branched from the base end of the primary main pipe 8 and connected to the water storage tank 1 is provided with a third valve 7 for opening and closing the pipe line 8a and a temperature sensor 6 for detecting water temperature. There is.

Then, by opening the first valve 3, the second valve 5, and the third valve 7, and operating the main pump 4 with the primary main pipe 8 and the pipe line 8a open, the water is stored. The water in the tank 1 flows through the first valve 3 and the main pump 4 as shown by the arrow in Figure 1.
, the second valve 5, and returns to the water storage tank l via the temperature sensor 6 and the third valve 7.

On the other hand, a plurality of partition valves 10 are provided at the tip of the primary main pipe 8.
The secondary main pipes 11 are connected to each other through the secondary main pipes 11, and a plurality of nozzles 12 are provided at the tips of the secondary main pipes 11. Water is then sprayed from these nozzles 12 toward predetermined insulators 13.

The first valve 3 is a manual valve and is normally kept open, and the other valves 5, 7, 9, and 10 are automatic valves that are automatically opened based on electrical control. It is designed to be opened and closed.

Therefore, when the outside temperature is below freezing, the insulator 13
If the main pump 4 is operated with the second valve 5 and the third valve 7 opened, and each compartment valve 10 and the fourth valve 9 closed, The water in the water storage tank 1, which is heated by the heater 2, circulates within the primary main pipe 8 at a speed of usually within 5 meters per second. At this time, when the temperature of the circulating water rises to a predetermined temperature and a signal corresponding to the temperature is output from the temperature sensor 6, it becomes possible to supply hot water to the secondary main pipe 11.

Note that this state may be notified to the operator by, for example, lighting an indicator lamp based on the temperature detection signal.

Then, when the regularly scheduled cleaning time for the insulator 13 arrives, or when it becomes necessary to clean the insulator 13 in an emergency, the supply of hot water to the secondary main pipe 11 starts immediately. be done.

That is, the third valve 7 is closed, the fourth valve 9 and each section valve 10 are opened, and the hot water in the primary main pipe 8 is pumped by the main pump 4 through each section valve 10 to the secondary main pipe. 11, and the hot water from the water storage tank 1 is branched and transferred to two series of primary main pipes 8, and then supplied to the secondary main pipe 11 via each division valve 10. And nozzle 12
Hot water is discharged from the insulator 13 to the insulator 13, and the insulator 13 is cleaned.

Further, the predetermined temperature of the hot water detected by the temperature sensor 6 is a temperature that prevents icicles from forming on the shade of the insulator 13 due to the outside air temperature when water is discharged to the insulator 13,
As shown in FIG. 2, the temperature is set to increase inversely as the outside temperature decreases. Furthermore, the temperature range of hot water in which icicles do not form varies depending on the water discharge pressure from the nozzle 12, and as shown in the figure, the upper right region A of the low water pressure cleaning curve corresponds to both low water pressure and high water pressure cleaning. Area B between the low water pressure washing curve and high water pressure washing curve is the range where icicles cannot form due to high water pressure washing only, and area C on the lower left side of the high water pressure washing curve is the range where icicles do not form due to high water pressure washing. This is the range where icicles can be formed by washing. Therefore, the predetermined temperature of the hot water is set in accordance with the set water discharge pressure during washing. Therefore, even if the outside air temperature becomes low, icicle growth can be reliably prevented according to the set water discharge pressure.

As mentioned above, in this embodiment, water is circulated through the primary main tube 8 while being warmed in the water storage tank 1, so the insulator 13 Even when cleaning is performed, only hot water is always supplied to the secondary main pipe 11, and the hot water can be immediately discharged from the nozzle 12. After cleaning the insulator, the hot water remaining on the surface of the insulator 13 is cooled by the outside air, and even if icicles begin to form between the caps of the insulator 13, the icicles will be melted by the warm water during the next cleaning, preventing them from growing. Ru. Therefore, the insulator 13 can be reliably cleaned without causing icicles to grow between its caps, and a decrease in the insulation ability of the insulator 13 can be reliably prevented.

In addition, even if power plants and substations are installed near the coast (and in cold regions) that are particularly susceptible to salt damage, by adopting the cleaning method of this embodiment, it is possible to prevent icicles from growing between the insulators. It is possible to prevent salt damage to the insulators due to sea salt by washing them frequently without washing them. Therefore, it is possible to install power plants and substations in cold regions without being subject to restrictions related to washing the insulators. Become.

In addition, in this embodiment, the piping of the -next pipe 8 is made into a loop shape, and hot water is supplied from the water storage tank 1 to the secondary main pipe 11 by the two series of primary main pipes 8 during cleaning, which is different from the conventional example. Compared to the primary main pipe 28, although the piping length is doubled, the primary main pipe 8 with a smaller pipe diameter can be used, so the piping cost does not increase much.

Further, since the division valve IO is usually arranged near the insulator 13, the length of the secondary main pipe 11 from the division valve 10 to the nozzle 12 can be shortened. For this reason, even if there is one volume of water remaining in the secondary main pipe 11 after water discharge before the next water discharge, only a small amount of water needs to be removed.

Furthermore, this invention can also be implemented as follows.

(a) As shown in FIG. 3, the first valve 3 and the second valve 5
An auxiliary main pipe 14 is provided between the outflow sides of the auxiliary main pipe 14, and a small circulation pump 15, a fifth valve 16, and a check valve 17 are connected in series to the auxiliary main pipe 14. When the water in the water storage tank 1 is to be circulated, the small circulation pump 15 is operated, and the water from the water storage tank 1 is pumped through the first valve 3 and the small circulation pump 15, as shown by the arrow in the figure. 15, the water is transferred to the primary main pipe 8 via the fifth valve 16 and the check valve 17, and is returned to the water storage tank 1 via the third valve 7.

In this other example, since it is sufficient to use the small circulation pump 15 with a small output except when cleaning the insulator 13, there is no need to use the main pump 4 with a large output, and the operating cost can be reduced. .

(b) As shown in FIG. 4, two series of primary main tubes 8 are connected to each other by a conduit 18 near the base end of the tube 8, and a small circulation pump 15 is installed in the conduit 18. Another heater 19 is provided as a heating means, and the circulating water in the pipe 8 is heated by another heater 19 without being returned to the water storage tank 1, and is circulated as shown by the arrow in the figure. The temperature sensor 6 connected to the primary main pipe 8 is configured to detect the temperature of the primary main pipe 8.

In this case, the circulating water only in the -next pipe 8 is connected to another heater 19.
The heating efficiency of the circulating water can be improved.

(c) As a heating means, use steam using heat generated from high-voltage power facilities at power plants and substations.

Effects of the Invention As detailed above, according to the present invention, insulators can be cleaned in power plants and substations in cold regions without causing icicles to grow between their caps, and a decline in the insulating ability of the insulators can be reliably prevented. It has excellent effects.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment embodying the present invention. Figure 1 is a schematic diagram of piping, etc., and Figure 2 shows the relationship between the water discharge pressure from the nozzle, the outside air temperature, and the cleaning water temperature. This is a graph showing. 3 and 4 are schematic diagrams showing another example, and FIG. 5 is a schematic diagram showing a conventional example. 2.19...Heater as heating means, 6...Temperature sensor, 8...-Next pipe, 11...Secondary main pipe, 13
···insulator.

Claims (1)

[Claims] 1. Circulating water is circulated in a primary main pipe (8) piped in a loop while being heated by heating means (2, 19) until it becomes hot water at a predetermined temperature, and the circulating water becomes hot water at a predetermined temperature. A method for washing an insulator with hot water, in which when the hot water reaches the temperature, the hot water is supplied to a secondary main pipe (11) to start washing the insulator (13) with hot water. 2. The predetermined temperature is when water is sprayed onto the insulator (13).
The hot water cleaning method for an insulator (13) according to claim 1, wherein the temperature is set to prevent icicles from forming on the shade of the insulator (13) due to the outside air temperature, and increases as the outside air temperature decreases. 3. The timing to start supplying hot water to the secondary main pipe (11) is determined by a temperature sensor (
6) The hot water cleaning method for insulators according to claim 1, wherein the temperature is set based on when a predetermined temperature is detected.