JPH1163746A - Device for preventing condensation of cooling water in cooling tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sharply reduce the quantity of water used in a cooling tower. SOLUTION: A device is equipped with a pipe 11 on high temperature side of cooling water connected between the outlet side of the condenser of a freezer 6 and the sprinkler 4 of a cooling tower 1, a pipe 12 on low temperature side of cooling water connected between the inlet side of the condenser of the freezer 6 and the tank 2 of the cooling tower 1, a water supply pipe 15 for replenishment of blow water erected within the tank 2, a water supply pipe 19 connected to the water supply pipe 15 for replenishment of blow water through a first solenoid valve MV1, a drain pipe 13 connected to the pipe 11 on high temperature side of cooling water and through a second solenoid valve MV2, and a condensation detection sensor 21 arranged within the tank 2. As a result the first and the second solenoid valves MV1 and MV2 are interlocked to open and close, based on the detection signal of the condensation detection sensor 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of preventing the concentration of cooling water in a cooling tower used for a refrigerator for production or air conditioning in a factory or an office building.

[0002]

2. Description of the Related Art In a cooling tower, heat is exchanged with a condenser of a refrigerator to disperse heated water as water droplets in the air, the water temperature is lowered by the latent heat of evaporation of the water, and the water is circulated again as cooling water to the condenser. Like that. Since the cooling water used here is in direct contact with the atmosphere, contaminants and dust in the air dissolve into the cooling water and deteriorate the quality of the water. Is concentrated and there is a problem that heat exchange efficiency is reduced due to corrosion of cooling water pipes, condensers, etc., scale, slime adherence, generation of algae, etc.To solve this problem, conventionally,
A water treatment agent such as a corrosion inhibitor, a scale adhesion inhibitor, or an anti-algae agent is periodically injected into the cooling water using a timer, and when the electric conductivity of the cooling water exceeds a set value, the water in the cooling tower is removed. And supply of makeup water to prevent the concentration of impurities in the cooling water.

[0003]

By the way, an overflow pipe is provided in the water tank of the cooling tower, and when the water level in the water tank becomes a predetermined level or more, the cooling water is drained out of the system through the overflow pipe. However, in the conventional cooling water concentration preventing device, when the makeup water is supplied into the water tank of the cooling tower, the distance between the makeup water supply unit and the overflow pipe is short, so that the fresh water and the low temperature portion are not provided. As a result, the amount of water used increases and heat is wasted. Further, since the water treatment agent is periodically injected by the timer, the water treatment agent may be injected during the blow in a timely manner, and as a result, the water treatment agent is wastefully discharged out of the system. There is a problem that as the amount of use increases, the cost of purifying the water treatment agent also increases, and in some cases, the water treatment agent is excessively charged.

The present invention has been made to solve the above-mentioned conventional problems, and a first object of the present invention is to greatly reduce the amount of water used in a cooling tower. The purpose is to greatly reduce the amount of the agent used and the purification cost.

[0005]

For this purpose, the present invention according to claim 1 comprises a cooling water high temperature side pipe 11 connected between the condenser outlet side of the refrigerator 6 and the water sprinkling device 4 of the cooling tower 1; A cooling water low temperature side pipe 12 connected between the condenser inlet side of the machine 6 and the water tank 2 of the cooling tower 1; a blow water supply water supply pipe 15 erected in the water tank 2; Water supply pipe 15
Water supply pipe 19 connected to the first through a first solenoid valve MV1
A drain pipe 13 connected to the cooling water high-temperature side pipe 11 via a second solenoid valve MV2; and a concentration detection sensor 21 disposed in the water tank 2. The first and second solenoid valves MV1, MV2 are opened and closed in conjunction with each other based on the detection signal of the first and second detection signals.
The water treatment agent tank 9 and the water treatment agent injection pump 10 are connected to the cooling water high temperature side pipe 11, and the first and second solenoid valves M are connected.
While the valves V1 and MV2 are closed, the water treatment agent injection pump 10 is operated in accordance with the opening time of the first or second solenoid valve MV1 or MV2. The water treatment agent tank 9 and the water treatment agent injection pump 10 are connected to the cooling water high temperature side pipe 11, and the blow flow rate detection sensor 2 is connected to the drain pipe 13.
3, wherein the water treatment agent injection pump 10 is operated according to the flow rate detected by the blow flow rate detection sensor 23 while the first and second solenoid valves MV1 and MV2 are closed. . Note that the numbers added to the above configuration are compared with the drawings for easy understanding of the present invention, and the present invention is not limited thereto.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a cooling water concentration preventing device in a cooling tower according to the present invention. FIG. 1 is an overall configuration diagram, and FIG. 2 is a configuration diagram of a control system.

In FIG. 1, a cooling tower 1 is installed on the roof of a building, and is provided with a water tank 2, a filler layer 3 provided above the water tank 2, and a filler layer 3 provided above the filler layer 3. A water dispenser 4 and a cooling fan 5 are provided, and a refrigerator 6, a cooling water pump 7, a water treatment agent tank 9 and a water treatment agent injection pump 10 are installed on the first floor.

[0008] The condenser outlet side of the refrigerator 6 and the sprinkler 4 of the cooling tower 1 are connected by a cooling water high-temperature side pipe 11, and
The condenser inlet side and the lower part of the water tank 2 of the cooling tower 1 are connected by a plurality of cooling water low temperature side pipes 12. The water treatment agent tank 9 and the water treatment agent injection pump 10 are connected to the cooling water high-temperature side pipe 11, and a drain pipe 13 is connected to the inlet side of the water tank 2. Valve MV
2 are provided. Further, the cooling water pump 7 is disposed in the cooling water low temperature side pipe 12.

In the water tank 2 of the cooling tower 1, a plurality of blow water supply water supply pipes 15, an evaporation loss supply water pipe 16, and an overflow pipe 17 are provided upright. The blow water supply water supply pipe 15 is connected to a water supply pipe 19 via a first solenoid valve MV1 and a water meter 18. The installation position of the blow water supply water supply pipe 15 is set at a position farthest from the cooling water outlet of the water tank 2 so that the fresh water is mixed well with the high concentration water. The overflow pipe 17 has an upper end extending upward from the existing position, and is provided so as to drain from the drain pipe 13 to the outside of the system when makeup water is continuously supplied due to a failure of the solenoid valve MV1 or the like. .

The makeup water pipe 16 for the evaporation loss is provided with a first solenoid valve M
V1 is connected to the upstream side, a float valve 20 is attached to the upper end of the makeup water pipe 16, and the water level of the water tank 2 is adjusted to the makeup water pipe 1
When the water level of the water tank 2 rises above the top of the makeup water pipe 16, the float valve 20 closes, and when the water level of the water tank 2 rises above the top of the makeup water pipe 16, the float valve 20 closes. The water level in the water tank 2 is always adjustable so as to be a predetermined water level.

At the bottom of the water tank 2, a concentration detecting sensor 21 for detecting electric conductivity of the cooling water is provided. In addition, the amount of water supplied from the blow water supply water supply pipe 15 and the amount of water blown from the second solenoid valve MV2 of the drain pipe 13 are designed to be equal.

The operation of the cooling water concentration preventing device having the above configuration will be described with reference to FIGS. The concentration detection sensor 21 detects the electric conductivity of the cooling water in the water tank 2, and this signal is sent to the concentration determination means 22a of the control device 22, where it is determined that the concentration is equal to or more than the predetermined value. The first solenoid valve MV1 by the solenoid valve output means 22b.
And a signal for opening the second solenoid valve MV2 is output. As a result, fresh water is supplied from the water supply pipe 19 to the blow water supply water supply pipe 15 via the first solenoid valve MV1, and at the same time, the high-concentration cooling water at the lower part of the water tank 2 is supplied to the cooling water low-temperature side pipe 12 ,
Condenser of refrigerator 6, cooling water high temperature side pipe 11, drain pipe 13
And drained through the second solenoid valve MV2 and the regulating valve 24. When the electric conductivity of the cooling water in the water tank 2 becomes lower than a predetermined value due to the supply of fresh water, the electromagnetic valve output means 22b outputs the first electric current.
Of the second solenoid valve MV1 and the second solenoid valve MV2 are output.

The first solenoid valve MV1 (= second solenoid valve MV1)
The opening time of 2) is measured by the solenoid valve opening time measuring means 22c, and the infusion pump operating time calculating means 22d calculates the operating time of the infusion pump in accordance with the electromagnetic valve opening time, and injects based on this operating time. The water treatment agent injection pump 10 is operated by the pump output means 22e. In the present invention, since the cooling water is blown from the cooling water high-temperature side pipe 11, the water treatment agent is wastefully discharged if the water treatment agent injection pump 10 is operated during the blow. Therefore, when both the solenoid valves MV1 and MV2 are open, that is, during blowing, the water treatment agent injection pump 10 is interlocked so as not to be operated, thereby preventing wasteful discharge of the water treatment agent.

FIG. 3 shows another example of the control system according to the present invention. In the example of FIG. 2, the operation time of the infusion pump is calculated according to the opening time of the solenoid valve. In this example, however, the blowdown of the drain pipe 13 of FIG. 1 is performed downstream of the second solenoid valve MV <b> 2. The flow rate detection sensor 23 is provided, the operation time of the injection pump is calculated according to the blow flow rate, and the water treatment injection pump 10 is operated by the injection pump output means according to the operation time. Note that the blow flow rate detection sensor 23 may be provided on the first solenoid valve MV1 side.

[0015]

As is apparent from the above description, claim 1
According to the described invention, when makeup water for preventing concentration of cooling water is supplied, fresh water is mixed and diluted with concentrated water in the water tank,
The high-concentration and high-temperature cooling water is blown from the cooling water high-temperature side piping side of the refrigerator, so that new water is not wasted from the overflow pipe as in the past, and the amount of water used is greatly reduced. Heat can be prevented from being wasted.

According to the second and third aspects of the present invention,
Since the water treatment agent is injected according to the discharged blow water amount, an appropriate amount of the water treatment agent can always be managed, and the amount of the water treatment agent used and the purification cost can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a cooling water concentration preventing device in a cooling tower of the present invention.

FIG. 2 is a configuration diagram illustrating an example of a control system according to the present invention.

FIG. 3 is a configuration diagram showing another example of a control system according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cooling tower 2 ... Water tank 4 ... Sprinkler 6 ... Refrigerator 9 ... Water treatment agent tank 10 ... Water treatment agent injection pump 11 ... Cooling water high temperature side pipe 12 ... Cooling water low temperature side pipe 13 ... Drain pipe 15 ... Blow water Supply water pipe for supply 19 ... Water supply pipe 21 ... Concentration detection sensor 23 ... Blow flow rate detection sensor MV1 ... First solenoid valve MV2 ... Second solenoid valve

Claims (3)

[Claims] 1. A cooling water high temperature pipe connected between a condenser outlet side of a refrigerator and a water sprinkler of a cooling tower, and a cooling water low temperature pipe connected between a condenser inlet side of the refrigerator and a water tank of the cooling tower. A side pipe, and a blow water supply water supply pipe erected in the water tank,
A water supply pipe connected to the blow water supply water supply pipe via a first solenoid valve, a drain pipe connected to the cooling water high temperature side pipe via a second solenoid valve, and a water supply pipe. A cooling water concentration preventing device, comprising: a concentration detection sensor provided therein, wherein the first and second solenoid valves are opened and closed in conjunction with each other based on a detection signal of the concentration detection sensor. 2. A water treatment agent tank and a water treatment agent injection pump are connected to the cooling water high temperature side pipe, and when the first and second solenoid valves are closed, the first or second solenoid valve is closed. The cooling water concentration preventing device according to claim 1, wherein the water treatment agent injection pump is operated according to an opening time. 3. A water treatment agent tank and a water treatment agent injection pump are connected to the cooling water high temperature side pipe, and a blow flow rate detection sensor is provided in the drain pipe, and the first and second solenoid valves are closed. 2. The cooling water concentration preventing device according to claim 1, wherein the water treatment agent injection pump is operated according to a flow rate detected by the blow flow rate detection sensor. 3.