JP2002028602A - Device and method for cleaning cooling water system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently clean a cooling water system while suppressing the quantity of cleaning water to be used at the time of cleaning the cooling water system for cooling a bearing lubricating oil, or the like. SOLUTION: The cleaning water system 15 is temporarily connected to a circulation pipe line 2 of the cooling water system 1. A cleaning water tank 18, a cleaning water pump 20, a strainer 22 and a water cleaning device 21 are provided in a circulation pipe line 16 of the cleaning water system 15. The cleaning water (pure water) is supplied from a replenishing water equipment 6 in a state that the cooling water pump 3 is stopped to be stored in the cleaning water thank 18, and next, the cleaning water pump 20 is driven to circulate the cleaning water into the circulation pipe line 2 of the cooling water system 1 to clean the system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning apparatus and a cleaning method for cleaning a piping system when laying a cooling water system for cooling equipment and facilities.

[0002]

2. Description of the Related Art In power plants, substations, factories, buildings, and other facilities, equipment and associated equipment are often cooled by cooling water. A lubricating pipe is provided, and the lubricating oil heated at the bearing portion is cooled in a cooler including a water-cooled exchanger. The cooling water of the cooler is guided to a heat exchanger for heat radiation through a cooling water piping system. Generally, in the cooling water piping system,
In addition to the heat exchanger, it includes a cooling water pump, a strainer, a makeup water facility, and the like.

When a cooling water system is installed in a facility and operation is started, or when the cooling water system is suspended for a long period of time for periodic inspection or the like and operation is resumed, the inside of the cooling water system is first thoroughly washed. However, it is necessary to remove dust and iron rust existing in the system, and soluble substances which are stably attached to the inner wall of the pipe. A conventional general method of cleaning a cooling water system is to first supply pure water for cleaning from a makeup water system to a cooling water system to fill the inside thereof, and then operate a cooling water pump to cool the circulation pipe. Circulate water. While the cooling water circulates through the circulation pipe, solids such as dust and iron rust are captured and separated by the strainer.

On the other hand, iron-based soluble substances and the like adhering to the inner wall of a pipe or the like dissolve in cooling water during washing and increase the turbidity. Then, when the turbidity of the washing water becomes a certain level or more, the washing water in the circulation pipe is extracted, replaced with new washing water, and the washing operation is performed again. In this way, the washing operation is performed while removing and replenishing the washing water until the new solid content in the strainer is sufficiently reduced and the turbidity of the washing water does not rise above a certain level. repeat. The operation of the cooling water system can be started at any time after the washing is completed. However, during the operation, a chemical such as a rust inhibitor is constantly injected into the cooling water system by an injection device as a measure against rust on the inner wall of the pipe.

[0005]

However, in the conventional cleaning method as described above, when the capacity of the cooling water system is large, the number of times and the amount of pure water to be replaced in the cleaning at the time of installation are increased, and the replacement is required. There is a problem that labor and cleaning cost increase. A similar problem occurs when the operation suspension period is long or when the storage state (maintenance state) of the cooling water system during that period is extremely poor. On the other hand, solids such as dust and iron rust in the cooling water system are captured and separated by the strainer during cleaning, but they also circulate in the pump, which may damage the pump blades, bearing seals, etc. There is. Therefore, an object of the present invention is to solve such a problem in the conventional cleaning method, and an object of the present invention is to provide a new cooling water system cleaning apparatus and a new cleaning method therefor.

[0006]

According to the present invention, there is provided a cooling water system cleaning apparatus for cleaning a cooling water system having a circulation pipe for circulating cooling water between a cooling water pump and cooling equipment. Device. The apparatus comprises a washing water system which is detachably temporarily connected before and after the cooling water pump and circulates washing water in a circulation pipe of the cooling water system, wherein the washing water system is a circulation pipe of washing water, and a circulation pipe thereof. Washing water tank,
It has a washing water pump, a strainer and a water purification device.
The washing water is circulated from the washing water system to the circulation pipe of the cooling water system while the cooling water pump is stopped, so that the circulation pipe can be washed while purifying the washing water. Item 1). In the cleaning device, a heating device for heating the cleaning water can be provided in the cleaning water system (claim 2).

A method for cleaning a cooling water system according to the present invention which solves the above-mentioned problems is a method for cleaning a cooling water system provided with a circulation pipe for circulating cooling water between a cooling water pump and cooling equipment. In this method, a washing water system including a washing water circulation pipe and a washing water tank, a washing water pump, a strainer, and a water purification device provided in the circulation pipe is provided, and the washing water system is connected to the cooling water pump. The cleaning water pump is operated with the cooling water pump stopped, and the cleaning water in the cleaning water system is circulated through the circulation piping of the cooling water system while purifying the cleaning water. (Claim 3).

In the above-described cleaning method, a makeup water system is provided in the cooling water system, and the circulation pipe of the washing water system is temporarily connected to the circulation pipe of the cooling water system. The makeup water can be supplied to the washing water tank and stored as washing water in a washing water tank (claim 4).
Further, in the above-mentioned cleaning method, a heating device for heating the cleaning water is provided in the cleaning water system, the temperature of the cleaning water is increased by the heating device, and the cleaning water is circulated through the circulation pipe of the cooling water system from the makeup water facility. By supplying make-up water to the cooling water system, the temperature of the heated washing water can be lowered (claim 5).

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a process flow diagram of an apparatus for performing the cleaning method of the present invention, and FIG. 2 is a schematic apparatus diagram of a cleaning water system indicated by a chain line frame (right side from an arrow) in FIG. In these figures, 1 is a cooling water system,
2 is a circulation pipe of the cooling water system 1, 3 is a cooling water pump, 4 is a heat exchanger, 5 is cooling equipment such as a bearing cooling unit, 6 is a makeup water facility, 7 is a makeup water tank, 8 is a makeup water valve, 9 is a makeup water pipe, 10 is a makeup water supply pipe, 11 and 12 are regulating valves, 13
Is a bypass valve of the heat exchanger 4, and 14 is a bypass valve of the cooling facility 5.

Reference numeral 15 denotes a washing water system, and 16 denotes a washing water system.
Is a circulation pipe of the washing water system 15, 18 is a washing water tank, 1
9 is a heating device, 20 is a washing water pump, 21 is a water purification device, 22 is a strainer, 23 and 24 are flanged connection parts, 25 is an inlet valve of the circulation pipe 16, and 26 is a circulation pipe 1
Reference numeral 27 denotes an outlet valve, reference numeral 27 denotes a bogie for accommodating the equipment constituting the washing water system 15 and transports it to the washing place. Reference numeral 28 denotes a bogie 27.
Wheels. V in each pipe is an on-off valve for switching or the like.

A plurality (three in this example) of cooling water pumps 3 including a spare water pump are provided in parallel, and open / close valves V are provided before and after the cooling water pumps 3, respectively. The heat exchanger 4 cools the cooling water during operation of the cooling water system. Here, the cooling water exchanges heat with the secondary cooling water in the cooling water pipe 30 connected to a cooling means such as a cooling tower. Multiple groups (three in this example)
Are connected in parallel to the circulation pipe 2, and heat exchange is performed between the cooling water and the cooling target such as lubricating oil inside each cooling facility 5. In the drawings, the lubricating oil piping is omitted, and a bearing (not shown) is connected to the piping. Make-up water is supplied from a make-up water pipe 9 to a make-up water tank 7 of the make-up water facility 6, and its flow rate is adjusted by a make-up water valve 8. The makeup water in the makeup water tank 7 is supplied to the circulation pipe 2 by opening the on-off valve V of the makeup water supply pipe 10.

Flanged connection parts 23 and 24 are provided before and after the cooling water pump 3 in the circulation pipe 2 (specifically before and after the on-off valve V), and these are connected when the cooling water system 1 is operated. It is closed by a plate, but at the time of washing, the blind plate is removed and a circulation pipe 16 of the washing water system 15 is temporarily detachably connected as shown in FIG. The capacity of the washing water tank 18 in the washing water system 15 is set large enough to sufficiently wash the cooling water system 1 with the washing water stored inside without newly replenishing the washing water during washing. The washing water stored in the washing water tank 18 can be heated by a heating device 19 provided with an electric heater, a steam heating tube and the like. The water purification device 21 is provided as needed to remove dissolved components that increase the turbidity of the washing water, and includes an adsorption-type purification device filled with activated carbon or ion exchange resin,
A separation membrane type purification device provided with a hollow fiber membrane can be used.

Next, a method of cleaning a cooling water system using the above-described cleaning apparatus will be described. First, the carriage 27 accommodating the washing water system 15 is moved, and the circulation pipe 16 is temporarily connected to the connection portions 23 and 24 of the cooling water system 1. The on-off valves V before and after each cooling water pump 3 are closed, and pure water is supplied to the makeup water tank 7 of the makeup water facility 6. The heat exchanger 4 and the cooling equipment 5
If one or both washings are not required,
The on-off valves V provided before and after them are closed, and the bypass valve 13 is closed.
And open 14. Further, the circulation pipe 16 of the washing water system 15
The inlet valve 25, the outlet valve 26, and the on-off valves V before and after the operating equipment are also opened.

Next, the opening / closing valve V of the makeup water supply pipe 10 is opened, and pure water is supplied from the makeup water tank 7 to the cooling water system 1 as washing water.
To the circulation pipe 2. When the circulation pipe 2 is filled with pure water, the pure water further passes through the connection part 23 and the washing water system 1
5 overflows into the circulation pipe 16 and the washing water tank 18. After confirming that the washing water tank 18 is filled with a predetermined amount of washing water (pure water), the makeup water supply pipe 1
The on-off valve V of 0 is closed to stop the supply of pure water. Next, the washing water pump 20 is operated, and the circulation pipe 1 of the washing water system 15 is operated.
6, a cooling water system 1, and a large circulation path formed by the circulation pipe 2, that is, the washing water tank 18 and the strainer 22.
-Water purification apparatus 21-Wash water pump 20-Outlet valve 26-Circulation pipe 2-Outlet valve 25-Wash water is circulated through the path of the wash water tank 18, and the circulation pipe 2 of the cooling water system
(Including the heat exchanger 4 and cooling equipment 5 connected thereto). At this time, as described above, the cooling water pump 3 does not pass the washing water because the opening / closing valves V before and after the cooling water pump 3 are closed.

The circulation amount of the washing water can be adjusted by an adjustment valve 12 provided in the circulation pipe 2. Further, the circulation amount of the washing water can be adjusted by the rotation speed of the washing water pump 20 or the like. In that case, the bypass valve 1 of the regulating valve 12
It is desirable to open 3. When the heat exchanger 4 is also washed at the same time, the regulating valve 12 is closed and the circulation amount of the washing water is adjusted by the regulating valve 11. Solid matter such as dust and iron rust in the circulation pipe 2 is captured by the strainer 22 by the washing operation, and the water purification device 21 separates soluble substances dissolved in the wash water from the pipe inner wall and the like. The turbidity increasing speed can be reduced, and the capacity of the washing water tank 18 can be correspondingly reduced. Wash water tank 18
When the volume of the cleaning water is increased, the turbidity of the cleaning water does not increase so much even if the cleaning water is circulated until the cooling water system 1 can be sufficiently cleaned. Therefore, it is not necessary to repeat the washing operation while replacing the washing water in the cooling water system 1 and the washing water system 15 as in the related art.

By raising the temperature of the washing water to, for example, 50 to 80 ° C., the washing efficiency can be increased.
The heating operation of the washing water is performed by the heating device 1 provided in the washing tank 18.
9, but the upper limit temperature is limited by the allowable temperature of the cooling equipment 5. Next, it is confirmed that the increase in the turbidity of the washing water has settled to a certain level or less, and that the increase in the solid content captured by the strainer 22 has stopped. When the temperature of the cleaning water is raised as described above, new pure water is supplied from the makeup water facility 6 to the cooling water system 1 to lower the temperature of the cleaning water to a temperature before the temperature rise. When the temperature of the washing water in the cooling water system reaches a normal value, the supply of pure water is stopped, and then the washing water pump 20 is stopped. Next, the washing water system 15
The inlet valve 25 and the outlet valve 26 are closed, and the washing water system 15 is cut off from the connecting portions 23 and 24, and this portion is closed with a black plate.

As a result, all the washing operations are completed, so that the cooling water system 1 is in an operable state. However, as described above, the circulating piping 2 of the cooling water system 1 is operated as a measure for preventing rust on the inner wall of the piping. A chemical such as a rust preventive is continuously injected by an injection device from an injection port provided in the like. Note that a plurality of cooling water systems 1 can be sequentially cleaned using one cleaning water system 15. In this case, when the cleaning operation of one cooling water system 1 is completed, the connection portions 23 and 2 of the cooling water system 1 are completed.
The washing water system 15 can be disconnected from the cooling water system 4, and the carriage 27 can be moved to the connecting portions 23 and 24 of the other cooling water systems 1 and operated in the same manner.

[0018]

As described above, the cleaning device for a cooling water system according to the present invention comprises a cleaning water circulation pipe, a cleaning water tank, a cleaning water pump, a strainer, and a water purification device provided in the circulation pipe. The system is configured so that the cleaning water can be circulated through the circulation pipe of the cooling water system while cleaning the cleaning water while the cooling water pump of the cooling water system is stopped, so that the cleaning water is always kept clean. The inside of the circulation pipe can be washed while performing. Then, the cooling water system can be sufficiently washed without replacing the washing water in the washing step. As a result, the amount of cleaning water used such as purified water can be reduced,
The time required for cleaning can also be reduced. Further, since the cooling water pump is not used for cleaning, it is possible to effectively prevent the cooling water pump blades and the like from being damaged by impact due to solids such as dust during the cleaning. This damage prevention effect is particularly effective when a large-capacity and expensive cooling water pump is installed. In the above-described cleaning device, by providing a heating device for heating the cleaning water in the cleaning water system, the temperature of the cleaning water can be increased to further enhance the cleaning effect.

Further, the method for cleaning a cooling water system according to the present invention provides a cleaning water system comprising a cooling water circulation pipe, a cleaning water tank, a cleaning water pump, a strainer and a water purification device provided in the cleaning water circulation pipe. The cleaning water system is temporarily connected before and after the cooling water pump of the cooling water system, and the cleaning water pump is operated while the cooling water pump is stopped to purify the cleaning water of the cleaning water system. It is characterized in that it is circulated through the circulation pipe for washing. Therefore, the cooling water system can be sufficiently washed without replacing the washing water in the washing step, so that the amount of washing water such as purified water can be reduced and the time required for washing can be shortened. Furthermore, since the cooling water pump does not need to be used for cleaning, it is possible to prevent damage to the blades of the cooling water pump due to solids such as dust during cleaning.

In the above-described cleaning method, a makeup water system is provided in the cooling water system, and the circulation pipe of the washing water system is temporarily connected to the circulation pipe of the cooling water system. And make-up water can be stored in the wash water tank as wash water. By doing so, it is possible to simplify the operation of replenishing the washing water and filling the cooling water system and the washing water system with water, thereby improving the working efficiency. Further, in the above-described cleaning method, a heating device for heating the cleaning water is provided in the cleaning water system, and a heating operation of the cleaning water is performed by the heating device, and the cleaning water is circulated through the circulation pipe of the cooling water system. By supplying make-up water from the make-up water facility to the cooling water system, the temperature of the washing water whose temperature has been raised can be lowered. By doing so, it is possible to raise the temperature of the cleaning water to increase the cleaning effect without complicating the apparatus, and to lower the temperature again after the cleaning to make the cooling water system an operating condition.

[Brief description of the drawings]

FIG. 1 is a process flow diagram of an apparatus for performing a cleaning method of the present invention.

FIG. 2 is a schematic view of a device constituting a washing water system indicated by a chain line frame in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling water system 2 Circulation pipe 3 Cooling water pump 4 Heat exchanger 5 Cooling equipment 6 Makeup water equipment 7 Makeup water tank 8 Makeup water valve 9 Makeup water pipe 10 Makeup water supply pipe 11 Adjustment valve 12 Adjustment valve 13 Bypass valve 14 Bypass Valve 15 Wash water system 16 Circulation pipe 18 Wash water tank 19 Heating device 20 Wash water pump 21 Water purification device 22 Strainer 23 Connection part 24 Connection part 25 Inlet valve 26 Outlet valve 27 Truck 28 Wheel 30 Cooling water pipe V On-off valve

Claims (5)

[Claims] An apparatus for cleaning a cooling water system provided with a circulation pipe for circulating cooling water between a cooling water pump and a cooling facility. And a washing water system 1 for circulating washing water through a circulation pipe 2 of the cooling water system 1.
The washing water system 15 includes a washing water circulation pipe 16, a washing water tank 18, a washing water pump 20, a strainer 22, and a water purification device 21 provided in the circulation pipe 16. The cleaning water is circulated from the cleaning water system 15 to the circulation pipe 2 of the cooling water system 1 in a state where the cleaning water 3 is stopped, so that the cleaning water can be purified and the circulation pipe 2 can be washed. Cooling water system cleaning equipment. 2. The cleaning device for a cooling water system according to claim 1, wherein a heating device 19 for heating the cleaning water is provided in the cleaning water system 15. 3. A method for cleaning a cooling water system 1 provided with a circulation pipe 2 for circulating cooling water between a cooling water pump 3 and a cooling facility 5, comprising: a cleaning water circulation pipe 16; A washing water system 15 including a washing water tank 18, a washing water pump 20, a strainer 21, and a water purification device 21 is provided. The washing water system 15 is temporarily connected detachably before and after the cooling water pump 3; With the cooling water pump 3 stopped, the cleaning water pump 20 is operated to circulate the washing water of the washing water system 15 to the circulation pipe 2 of the cooling water system 1 and purify the washing water while purifying the washing water. A method for cleaning a cooling water system, comprising: 4. A replenishing water system 6 is provided in the cooling water system 1, and the circulation piping 16 of the washing water system 15 is temporarily connected to the circulation piping 2 of the cooling water system 1.
4. The method for cleaning a cooling water system according to claim 3, wherein the makeup water is supplied to the cleaning water system 15 via the cleaning water tank and stored in the cleaning water tank 18 as the cleaning water. 5. 5. A heating device 19 for heating the washing water is provided in the washing water system 15, the temperature of the washing water is raised by the heating device 19, and the washing water is circulated through the circulation pipe 2 of the cooling water system 1. The method for cleaning a cooling water system according to claim 4, wherein the temperature of the heated cleaning water is decreased by supplying the makeup water to the cooling water system 1 from the makeup water facility 6.