JP2001004295A - Individual operation device for cooling tower, and its individual operation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue the operation even if the coil breaks, by providing the device with a bypass duct line which connects the inlet and the outlet of a coil for cooling inside fluid by sprinkling cooling water from a sprinkling nozzle, and opening the bypass valve from the output of a fluid sensor which detects the leakage of fluid from the coil. SOLUTION: At usual operation, cooling oil is sent from a clean tank 71 to a pump 73, and is distributed by a valve 77 and is sent to cooling towers 5 (5a-5d). The oil flowing in the coil 37 within each cooling tower 5 is cooled by the cooling water sprinkled from a sprinkling nozzle 17. In this case, if the coil 37 of any cooling tower 5 breaks, oil mixes in the cooling water, so a fluid sensor 53 detects this oil-mixed cooling water, and this device closes an inlet valve 33 and an outlet valve 39 under control by controller 57, and also this opens a bypass valve 45, and circulates the oil through the bypass pipe 43 so that it may bypass the broken coil 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an individual operation device of a cooling tower and an individual operation method thereof, and more particularly, to a method in which cooling oils cooled by individual cooling towers are combined and a cooling oil from a plurality of cooling towers is used. The present invention relates to a device for operating a cooling tower from which cooling oil has leaked and other cooling towers when cooling and lubricating equipment and the like, and an operation method thereof.

[0002]

2. Description of the Related Art Conventionally, in large plant equipment such as a rolling mill, a plurality of cooling towers are integrated into one cooling tower, and a plurality of cooling towers are arranged and operated at the same time to produce a large amount of cooling oil. The structure is such that cooling and lubrication are performed upon receiving the supply. FIG. 2 is a diagram showing a cooling circuit for a rolling mill in which a plurality of cooling towers are used as an example.
In FIG. 2, a plurality of rolling rolls 63 are incorporated in a rolling mill 61 for a rolling mill, and a cooling oil is supplied to suppress the generation of frictional heat generated when the plate 65 is rolled. I have.

[0003] Cooling oil is discharged from an oil nozzle 67 to cool and lubricate the rolling roll 63 and the plate 65. The cooling oil used in the rolling mill 61 is collected in a dirty tank 69 and, after removing dust and the like, is collected in a clean tank 71. Thereafter, the cooling oil is supplied to each of the cooling towers 75a, 75b, 75c by the oil pump 73.
It is sent to 75d ... At this time, the cooling oil passes through an oil valve 77 disposed between the oil pump 73 and the coil 83, and flows through the first cooling tower 75a and the second cooling tower 75.
b, the oil is uniformly sent to the third cooling tower 75c, the fourth cooling tower 75d, and so on.

[0004] Each of the first cooling tower 75a, the second cooling tower 75b,
Each of the third cooling tower 75c, the fourth cooling tower 75d,... First cooling tower 7
The cooling tower 5a and the second cooling tower 75b are provided adjacent to each other and housed in one cooling tower case 78. The first cooling tower 75a and the second cooling tower 75b are combined into one first cooling tower 81A. Similarly, the two cooling towers 75c and the cooling tower 7
5d are collectively referred to as a second cooling tower 81B. The first cooling tower 81A, the second cooling towers 81B,... Collect a plurality of cooling towers and supply cooling oil to the rolling mill 61. The first cooling tower 81A, the second cooling tower 81B,.
Since the operation is performed in exactly the same manner, the cooling tower 75a of the first cooling tower 81A will be described below. Cooling tower 7
The cooling oil flowing into 5a flows inside the coil 83 and is cooled by cooling water from outside the coil 83.

[0005] The cooling water is pumped by a cooling water pump 85 and passes through a check valve 87 and a watering valve 89.
Water is sprayed from the water spray nozzle 91 toward the coil 83 and cools the cooling oil flowing inside the coil 83. If the cooling capacity is insufficient, the cooling capacity is increased by the air blown by the fan 93. The sprayed cooling water accumulates in the lower part of the cooling tower case 78 and serves as a cooling water circulation device that is again pumped up by the cooling water pump 85. The cooled cooling oil is collected from the first cooling tower 81A, the second cooling tower 81B,... Via each check valve 99, and sent to the rolling mill 61 again by the rolling oil pump 93.

[0006]

However, two cooling towers (75a and 75a) are used in the conventional cooling circuit of FIG.
In the structure where b) is operated simultaneously using the cooling water of the same cooling tower case 78, when the coil in the cooling tower is broken, it is necessary to stop the operation of the two cooling towers sharing the cooling water circulation device. This is because if cooling water is mixed into the cooling oil due to coil breakage, the rolling mill and peripheral equipment will rust and cause a failure. For this reason, when a plurality of cooling towers sharing a cooling water circulating device with a damaged coil are stopped, a flow rate load is applied so that a large amount of cooling oil flows into other normally operating cooling towers. As a result, all cooling towers must be shut down. As a result, during restoration of the cooling tower, the operation of the rolling line is stopped, and the productivity of steel decreases.

The present invention focuses on the above-mentioned conventional problems, and relates to an individual operation device and an individual operation method of a cooling tower, and in particular, prevents a plurality of cooling towers from stopping even if a coil in the cooling tower is damaged. In this way, it is possible to operate individually, stop cooling only the damaged cooling tower and prevent the flow load from being applied to other normal cooling towers. It aims to provide an individual operation method.

[0008]

In order to achieve the above object, an invention for an individual operation apparatus for a cooling tower according to the present invention comprises: a coil for spraying cooling water from a water spray nozzle to cool an internal fluid; Cooling having at least an inlet valve and an outlet valve provided at an inlet and an outlet of the coil, a bypass valve provided at a bypass pipe connecting the inlet and the outlet of the coil, and a fluid sensor for detecting leakage of fluid from the coil. A plurality of towers are provided, and the fluid is bypassed by connecting the inlet and the outlet of only the cooling tower that has received a signal from the fluid sensor.

According to the invention of the individual operation method of the cooling tower according to the present invention, the fluid leaks from the coil to each of a plurality of cooling towers for cooling by flowing cooling water from the outside of the coil through which the fluid flows. A method is adopted in which the fluid is bypassed by connecting the inlet and the outlet of the coil of only the cooling tower that has been detected by the sensor and has received a signal from the fluid sensor.

Another invention of the individual operation method of a cooling tower according to the present invention relates to a method of distributing and flowing cooling oil of a rolling mill to a plurality of cooling towers, cooling the cooling oil from outside the coils of the cooling tower with cooling water, The fluid sensor detects that the cooling oil flowing inside the tank has leaked, outputs a closing command to the inlet and outlet of the coil only in the cooling tower that receives the signal from the fluid sensor, and connects the inlet and outlet of the coil. The control unit outputs an open command to a bypass circuit to be used to bypass the cooling oil.

[0011]

According to the above construction, the cooling tower has a plurality of cooling water circulating individually, and a lower portion of each cooling tower is provided when a fluid flowing inside the coil of the cooling tower leaks out. A fluid sensor for detecting is provided. When the coil in the cooling tower breaks, the inlet valve and the outlet valve provided at the inlet and the outlet of the coil are closed, and the bypass valve provided in the bypass circuit connecting the inlet and the outlet of the coil is opened, so that the fluid flows through the coil. And bypass it. At this time, when the fluid sensor detects that the coil is damaged, it outputs a signal to a control unit such as a controller to stop only the cooling tower, and the control unit outputs a close command to the inlet valve and the outlet valve. Also, an "open" signal is output to the bypass valve, and the fluid flows through the bypass circuit without flowing through the coil.

This makes it possible to operate the cooling towers individually so as to prevent the cooling towers from stopping, to stop cooling only the damaged cooling tower, and to prevent the flow load from being applied to other normal cooling towers. Therefore, the cooling water is not stopped completely.
Further, the number of rotations of the fan is increased or decreased so that the temperature of the fluid supplied to plant equipment such as a rolling mill is kept constant by measuring the temperature of the fluid collected from a plurality of cooling towers with a temperature sensor.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a cooling tower individual operation apparatus and an individual operation method according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an overall configuration circuit diagram of an individual cooling tower operating device 1, and is a circuit diagram illustrating a cooling circuit for a rolling mill using a plurality of cooling towers as an example. In the following, the same components as those of the related art are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 1, similarly to the above, the cooling oil collected in the clean tank 71 is separated by the oil pump 73 into the first cooling tower 5a and the second cooling tower 5 which are individually installed.
b, the third cooling tower 5c, the fourth cooling tower 5d, etc.
At this time, as in the conventional case, the oil valve 7 is controlled so that the cooling oil is uniformly sent to each of the first cooling tower 5a, the second cooling tower 5b, the third cooling tower 5c, the fourth cooling tower 5d,.
7 is attached. A plurality of the first cooling tower 5a, the second cooling tower 5b, the third cooling tower 5c, and the fourth cooling tower 5d are collected and supplied with the cooling oil to the rolling mill 61. In the following, the fourth cooling tower 5d will be described. The fourth cooling tower 5d
The cooling water circulation unit 11, the cooling oil circulation unit 31, and the control unit 51 are configured.

The cooling water circulating section 11 includes the cooling tower case body 1.
3, a watering pump 15, a watering nozzle 17, an electric motor 19 for watering, a fan 21, an electric motor 23 for a fan, a drain valve 25, and an electric motor 2 for a drain valve.
7 and an oil / water separation tank 29. The cooling tower case body 13 has a watering nozzle 17
And a coil 37 to be described later is housed below. In addition, a cooling water circulating device in which cooling water sprinkled from the watering nozzle 17 is stored in the lower portion and is pumped up again by the watering pump 15 is provided. In the cooling water circulating unit 11, a fan 21 driven by an electric motor for fan 23 is housed in an upper portion of the cooling tower case main body 13. Thereby, the cooling water is sucked from the lower part of the cooling tower case main body 13 by the watering pump 15 and then sent to the watering nozzle 17 to be sprayed toward the coil 37 described later,
The cooling oil flowing inside the coil 37 is cooled.
The fan 21 is driven by the fan electric motor 23, and when the temperature of the cooling water is high, the number of revolutions is increased to improve the cooling capacity.

The cooling oil circulation unit 31 includes a clean tank 71, an oil pump 73, an oil valve 77,
An inlet valve 33, an inlet valve electric motor 35, a coil 37, an outlet valve 39, an outlet valve electric motor 41, a bypass pipe 43, a bypass valve 45,
It comprises an electric motor 47 for a bypass valve, a check valve 99 and an oil pump 93 for rolling.

The cooling oil circulating section 31 draws the cooling oil from the clean tank 71, and the cooling oil is evenly distributed to each cooling tower by the oil valve 77. The cooling oil is circulated from the inlet valve 33 to the coil 37, the outlet valve 39, and ,
The cooling oil circulation device is collected through a check valve 99 and sent to the rolling mill 61 again by the rolling oil pump 93.

The coil 37 is housed inside the cooling tower case body 13, is cooled by the cooling water sprayed by the water spray nozzle 17, and cools the cooling oil flowing inside.
The bypass line 43 includes an inlet valve 33 and an outlet valve 39.
And a bypass valve 45 in between.
Are arranged. The bypass pipe 43 bypasses the cooling oil so that it does not flow to the coil 37 when the coil 37 is damaged.

The control section 51 comprises a fluid sensor 53, a temperature sensor 55, and a controller 57. The fluid sensor 53 is disposed at the lower part of the cooling tower case main body 13 and checks whether cooling oil is mixed in the cooling water,
No, and the signal is transmitted to the controller 57. The temperature sensor 55 detects whether or not the cooling oil collected from each cooling tower and sent to the rolling mill 61 has reached a predetermined temperature, and transmits a signal to the controller 57. The controller 57 receives a signal from the fluid sensor 53 and outputs a command to each electric motor. Further, in response to a signal from the temperature sensor 55, a command is output to the fan electric motor 23 to increase or decrease the rotation speed of the fan 21.

The cooling water circulating section 11 includes the cooling tower case body 1
3, a watering pump 15, a watering nozzle 17, a watering electric motor 19, a fan 21, and a fan electric motor 23. Cooling oil circulation part 3
1 is a clean tank 71, an oil pump 73, an oil valve 77, an inlet valve 33, an inlet valve electric motor 35, a coil 37, an outlet valve 39,
An outlet valve electric motor 41, a bypass line 43,
Bypass valve 45, electric motor 47 for bypass valve
, A check valve 99, and a rolling oil pump 93.

The operation of the embodiment of the cooling tower individual operation device 1 configured as described above is as follows. In FIG. 2, in a normal operation, the cooling oil is sucked and discharged from the clean tank 71 by the oil pump 73 and sent to the oil valve 77. The cooling oil evenly distributed by the oil valve 77 is supplied to each of the first cooling tower 5a, the second cooling tower 5b, the third cooling tower 5c, and the fourth cooling tower 5c.
It is sent to the cooling towers 5d and flows through the coils 37 in each cooling tower. The cooling oil flowing in the coil 37 is cooled by the cooling water sprayed from the water spray nozzle 17 toward the coil 37 as described above.

The cooled cooling oil is collected from the first cooling tower 5a, the second cooling tower 5b, the third cooling tower 5c, the fourth cooling tower 5d,. It is sent to the rolling mill 61 again by the oil pump 93. At this time, the temperature of the cooling oil is detected by the temperature sensor 55 and output to the controller 57. Controller 57
Compares the set temperature with the detected temperature, outputs a rotation control signal to the fan electric motor 23 to determine the amount of air blown by the fan 21 corresponding to the temperature difference therebetween, and outputs a rotation control signal to the fan 21. The number of revolutions is increasing or decreasing. For example, when the temperature of the cooling oil is lower than the set temperature, the rotation speed of the electric motor 23 for the fan is reduced, the rotation speed of the fan 21 is reduced, and the amount of air blown is reduced, so that the temperature of the cooling oil is reduced to the set value. I try to get closer.

If the coil 37 is damaged during operation of the rolling mill 61, cooling oil is mixed in the cooling water. The mixed cooling water is detected by the fluid sensor 53 and output to the controller 57. The controller 57 receives a signal from the fluid sensor 53, outputs a command to the inlet valve electric motor 35 and the outlet valve electric motor 41, and drives the inlet valve 33 and the outlet valve 39 to close. At this time, the controller 57 receives a signal from the fluid sensor 53, outputs a command to the electric motor 47 for the bypass valve, and drives the bypass valve 45 to open. Thereby, the cooling oil is bypassed from the inlet valve 33 to the outlet valve 39 through the bypass pipe 43 without passing through the damaged coil 37.

Since the cooling oil is bypassed without being cooled by an amount corresponding to the damaged coil 37, the temperature of the cooling oil collected through each check valve 99 and sent to the rolling mill 61 again by the rolling oil pump 93 is reduced. It will be higher than the set temperature. The temperature of the raised cooling oil is measured by the temperature sensor 55 and output to the controller 57. The controller 57 compares the set predetermined temperature with the detected temperature, and sets the fan 2 corresponding to the temperature difference between the two.
In order to determine the amount of air to be blown, for example, the damaged fourth cooling tower 5
d, ie, the first cooling tower 5a and the second cooling tower 5
(b) A rotation control signal is output to the electric motor 23 for the cooling tower fan of the third cooling tower 5c to uniformly increase the rotation speed of the fan 21. Accordingly, the cooling tower other than the damaged cooling tower is not subjected to a large load, it is possible to prevent a flow load, and an efficient individual operating device without stopping the cooling water can be obtained.

Although the above description has been made using the rolling mill 61, the present invention can be applied to plant equipment requiring cooling. Further, the liquid to be cooled has been described as a cooling oil, but can be applied to a fluid such as a vapor or a gas.

[0026]

As described above, the present invention has a plurality of cooling towers for individually circulating cooling water, and when a coil in any one of the cooling towers is damaged, the cooling tower is connected to the inlet and outlet of the coil. The inlet valve and the outlet valve provided are closed, and the bypass valve provided in the bypass circuit connecting the inlet and the outlet of the coil is opened, so that the fluid is bypassed without flowing through the coil. For this reason, it is possible to stop cooling only the damaged cooling tower and prevent the flow load from being applied to other normal cooling towers. it can.

In addition, since the temperature of the fluid collected from a plurality of cooling towers is measured by a temperature sensor and the number of rotations of the fan is increased or decreased so that the temperature of the fluid supplied to plant equipment such as a rolling mill becomes constant, Stable cooling and lubrication can be performed.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an entire configuration of an individual operation device of a cooling tower according to an embodiment of the present invention, and is a circuit diagram showing a cooling circuit for a rolling mill in which a plurality of cooling towers are used as an example. .

FIG. 2 is a circuit diagram showing an entire configuration of an individual operation device of a cooling tower according to a conventional embodiment, and is a circuit diagram showing a cooling circuit for a rolling mill using a plurality of cooling towers as an example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Individual operation apparatus of cooling tower 5a 1st cooling tower 5b 2nd cooling tower 5c 3rd cooling tower 5d 4th cooling tower 11 Cooling water circulation part 13 Cooling tower case main body 15 Watering pump 17 Watering nozzle 19 Electric motor for watering 21 Fan 23 Electric motor for fan 25 Drain valve 27 Electric motor for drain valve 29 Oil / water separation tank 31 Cooling oil circulation unit 33 Inlet valve 35 Electric motor for inlet valve 37 Coil 39 Outlet valve 41 Electric motor for outlet valve 43 Bypass line 45 Bypass valve 47 Electric motor for bypass valve 51 Control unit 53 Fluid sensor 55 Temperature sensor 57 Controller 57

Claims (3)

[Claims] 1. A coil for spraying cooling water from a water spray nozzle to cool an internal fluid, an inlet valve and an outlet valve provided at an inlet and an outlet of the coil, and a bypass pipe connecting the inlet and the outlet of the coil. A bypass valve provided in the
A plurality of cooling towers having at least a fluid sensor that detects leakage of fluid from the coil are installed, and the fluid is bypassed by connecting the inlet and the outlet of only the cooling tower that has received a signal from the fluid sensor. Characteristic individual operation device of cooling tower. 2. A fluid sensor detects that a fluid leaks from a coil into each of a plurality of cooling towers for cooling by flowing cooling water from outside of a coil in which a fluid flows, and receives a signal from the fluid sensor. A method for operating a cooling tower individually, comprising: connecting an inlet and an outlet of a coil of only the cooling tower to bypass a fluid. 3. A fluid sensor for distributing and flowing cooling oil from a rolling mill to a plurality of cooling towers, cooling the cooling oil with cooling water from outside the coils of the cooling tower, and detecting leakage of the cooling oil flowing inside the coils. And outputs a close command to the inlet and outlet of the coil only in the cooling tower that received the signal from the fluid sensor and received a signal from the fluid sensor. An individual operation method of a cooling tower, wherein oil is bypassed.