CN205192282U - Control system of cooling tower - Google Patents

Abstract

The utility model provides a cooling tower control system, comprising a water tank, a water pump connected to the water tank, a vacuum pump connected to one end of the water pump, a vacuum tank connected to the end of the vacuum pump away from the water pump, and a cooling unit connected to the vacuum tank. The vacuum tank is connected to at least one cooling unit, and each cooling unit includes a cooling tower, a heat exchanger arranged outside the cooling tower, a buffer tank arranged above the cooling tower and a second water inlet pipe connected to the bottom of the heat exchanger, The buffer tank is connected to the vacuum tank, and the buffer tank is also connected to the highest point of the heat exchanger. The vacuum pump can adjust the vacuum degree of the vacuum tank, and then adjust the vacuum degree of the buffer tank, so that the water in the second water inlet pipe passes through the heat exchanger. pumped into the buffer tank. The cooling tower control system of the utility model can automatically judge whether the cooling tower needs to be switched to the defogging state according to seasons and temperature changes, thereby avoiding the uninterrupted work of the damper motor and reducing energy consumption.

Description

A cooling tower control system

technical field

The utility model relates to an automatic control system of a cooling tower, in particular to a control system of a cooling tower.

Background technique

Cooling towers are widely used in large-scale industrial and mining enterprises, especially when the cooling tower is operating in the cold season, a pair of heat exchangers are generally added on both sides of the cooling tower, the cooling water of the system water distribution pipe passes through the heat exchanger, and then Under the action of the damper motor installed at the heater, the cold air outside the cooling tower is blown into the tower through the heat exchanger, so as to mix with the hot and humid saturated air rising from the bottom of the tower to form unsaturated air, eliminating or reducing the generation of white fog .

However, in the actual operation and operation process, the heat exchanger is often located at a higher place in the cooling tower, and the water channel in the heat exchanger is curved and long. If you want all the circulating water to enter the heat exchanger and then enter the In the water distribution system of the cooling tower, this puts forward higher requirements on the lift of the high-pressure water pump. Even if the water pump is replaced with a qualified lift to send water into the heat exchanger, it cannot be real-time based on the external temperature of the cooling tower. Controlling the opening and closing of the air door motor by itself increases the cost of the water pump on the one hand and consumes a lot of electric energy on the other hand.

Utility model content

The technical problem to be solved by the utility model is: in order to overcome the deficiency in the prior art that the cooling tower cannot remotely and automatically switch the defogging state according to the external temperature, a control system for the cooling tower is now provided.

The technical scheme adopted by the utility model to solve the technical problem is: a control system of a cooling tower, including a water tank, a water pump connected to the water tank, a vacuum pump connected to one end of the water pump, a vacuum tank connected to the end of the vacuum pump away from the water pump, and The cooling unit connected with the vacuum tank, the vacuum tank is connected with at least one cooling unit, and each cooling unit includes a cooling tower, a heat exchanger arranged outside the cooling tower, a buffer tank arranged above the cooling tower and connected to The second water inlet pipe below the heat exchanger, the buffer tank is connected to the vacuum tank, and the buffer tank is also connected to the highest point of the heat exchanger. The vacuum pump can adjust the vacuum degree of the vacuum tank, and then adjust the vacuum degree of the buffer tank, so that the first The water in the second water inlet pipe is pumped into the buffer tank through the heat exchanger.

Further, a pneumatic valve is provided above the buffer tanks to control the opening and closing of the buffer tanks.

Further, a second electric butterfly valve is provided on the second water inlet pipe, and the second electric butterfly valve can control water to rise from the second water inlet pipe.

Further, the control system also includes a steam-water separator, the steam-water separator is connected between the water pump and the vacuum pump, and the outlet ends of the steam-water separator are respectively connected to the water tank and the vacuum pump.

Further, the water outlet pipe of the vacuum pump is connected to the water tank, and the exhaust pipe of the vacuum pump is connected to the steam-water separator.

Further, the vacuum tank is also connected to a water storage tank, and the water storage tank is also connected to a water tank.

Further, the steam-water separator is provided with a first liquid level gauge.

Further, the buffer tank is provided with a second liquid level gauge, and the vacuum tank is provided with a vacuum gauge.

Further, there are two vacuum pumps connected in parallel to the vacuum tank.

Further, the number of the cooling units is four and connected in parallel to the vacuum tank.

The beneficial effects of the utility model are: the control system of a cooling tower of the utility model generates a negative pressure by vacuumizing the heat exchanger, sucks the water in the second water inlet pipe into the heat exchanger, and overcomes the The difficult problem of pumping water due to insufficient head of the high-pressure water pump; in addition, the control system of a cooling tower of the utility model can automatically judge whether the cooling tower needs to be switched to the defogging state according to the season and temperature changes, thereby avoiding the damper The uninterrupted operation of the motor reduces energy consumption.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is the structural representation of the control system of a kind of cooling tower of the present utility model;

Fig. 2 is a structural schematic diagram of a cooling unit in the control system of a cooling tower shown in Fig. 1 .

In the figure: 10, water tank, 20, water pump, 30, vacuum pump, 40, vacuum tank, 41, vacuum gauge, 50, cooling unit, 51, cooling tower, 511, heat exchanger, 512, damper motor, 52, buffer tank , 521, pneumatic valve, 522, second liquid level gauge, 53, first electric magnetic valve, 54, second electric magnetic valve, 55, first water inlet pipe, 56, second water inlet pipe, 60, steam-water separator, 61. The first liquid level gauge, 70. The water storage tank.

detailed description

Now in conjunction with accompanying drawing, the utility model is described in detail. This figure is a simplified schematic diagram, only schematically illustrating the basic structure of the utility model, so it only shows the configuration related to the utility model.

Please refer to shown in Fig. 1, the control system of a kind of cooling tower that the utility model provides, comprises water tank 10, the water pump 20 that is connected with water tank 10, the vacuum pump 30 that is connected at one end of water pump 20, is connected at the end of vacuum pump 30 away from water pump 20 A vacuum tank 40, and a cooling unit 50 connected to the vacuum tank 40. In order to complete the vacuuming work quickly, in the present embodiment, the number of vacuum pumps 30 is two and connected in parallel. After the two vacuum pumps 30 pumping ends are confluent and communicated, they are connected to one end of the vacuum tank 40 through a pipeline. In order to meet the requirements of the control system, they can be simultaneously Multiple cooling towers are controlled to eliminate mist. In this embodiment, the number of cooling units 50 is four.

Specifically, as shown in FIG. 2, each cooling unit 50 mentioned above includes a cooling tower 51, a heat exchanger 511 arranged outside the cooling tower 51, a buffer tank 52 arranged above the cooling tower 51, and a heat exchanger connected to the cooling tower 51. The second water inlet pipe 56 below the device 511, the buffer tank 52 communicates with the vacuum tank 40, the buffer tank 52 is also communicated with the highest point of the heat exchanger 511, the vacuum pump 30 can adjust the vacuum degree of the vacuum tank 40, and then adjust the buffer tank 52 so that the water in the second water inlet pipe 56 is pumped into the buffer tank 40 through the heat exchanger 511 . Above each of the buffer tanks 52 is provided a pneumatic valve 521 for controlling the opening and closing of the buffer tanks 52 .

The second water inlet pipe 56 is provided with a second electric butterfly valve 54 , and the second electric butterfly valve 54 can control water to rise from the second water inlet pipe 56 .

A pneumatic valve 521 that can be used to change the connection or disconnection state with the vacuum tank 40 is provided above each buffer tank 52 , and a second liquid level gauge 522 is also provided on the buffer tank 52 , which detects the liquid level in the buffer tank 52 . When the water level exceeds the set value, the pneumatic valve 521 will be closed, and the buffer tank 52 will be disconnected from the vacuum tank 40.

Please refer to shown in Fig. 1, also comprise steam-water separator 60 in this control system, described steam-water separator 60 is pipe-connected between water pump 20 and vacuum pump 30, and the water outlet end of described steam-water separator 60 is respectively pipe-connected water tank 10 and At the water inlet of the vacuum pump 30, the steam-water separator 60 is provided with a first liquid level gauge 61. When the water level in the steam-water separator 60 exceeds the set water level, the excess will flow into the water tank 10 through the pipeline.

The water outlet end of the vacuum pump 30 is also connected to the water tank 10, and the exhaust end of the vacuum pump 30 is connected to the steam-water separator 60 through a pipeline. The steam-water separator 60 can separate the moisture in the gas discharged by the vacuum pump 30, and then flow into the water tank again. .

The vacuum tank 40 is provided with a vacuum gauge 41, and a water storage tank 70 is connected to the bottom of the vacuum tank 40. The other end of the water storage tank 70 is connected to the water tank 10. During the vacuuming process, the vacuum tank 40 Inhale the hot air, and after cooling, small water droplets will flow into the water storage tank 70 from the inner wall of the vacuum tank 40, and finally return to the water tank 10.

The control system of the cooling tower is also connected with a PLC control cabinet (not shown), and the PLC control cabinet is used to control the opening and closing of the water pump 20, the pneumatic valve 521 and the air door motor 512.

Below in conjunction with Fig. 1 and Fig. 2, the working process of the control system of a kind of cooling tower of the present utility model is illustrated: when the ambient temperature was higher than the set value, the first electric magnetic valve 53 was opened, and the second electric magnetic valve 54 Closed, the water of the water distribution system directly enters the water spray pipe of the cooling tower 51 from the first water inlet pipe 55 to spray.

When the ambient temperature is lower than the set value, the first electric magnetic valve 53 is closed, the second electric magnetic valve 54 is opened, the PLC control cabinet turns on the water pump 20, and starts to pump water from the water tank 10, and the water enters the vacuum pump through the steam-water separator 60 30, when the water in the vacuum pump 30 reaches the opening condition, the vacuum pumping work of the vacuum pump 30 will start, and the pneumatic valve 521 in the cooling unit 50 that needs to be defogged will open. Water enters in the heat exchanger 511 from the second water inlet pipe 56 and rises in the buffer tank 52, when the water in the heat exchanger 511 crosses the highest point of the heat exchanger 511 until reaching the set water level of the buffer tank 52, this At this time, the pneumatic valve 521 above the buffer tank 52 is closed, and the damper motor 512 at the heat exchanger 511 is opened, and the outside air is heated by the heat exchanger 511 and then blown into the cooling tower 51 to achieve the purpose of defogging. Similarly, the working processes of the other three cooling units 50 are as described above, and will not be repeated here.

When each pneumatic valve 521 in the four cooling units 50 is closed and the vacuum degree in the vacuum tank 40 reaches the set value, the water pump 20 automatically cuts off the power supply, and the vacuum pump 30 stops running to complete the vacuuming work of the whole system. During the operation of the system, water continuously flows in the heat exchanger 511, and some gas will be contained in the water. As the gas accumulates more and more, the degree of vacuum will decrease, and the water level in the buffer tank 52 will drop. At this time, the PLC After the control cabinet receives the liquid level drop signal from the second liquid level gauge 522, it controls the opening of the pneumatic valve 521, and the system will be opened again to repeat the above vacuuming process until the vacuum degree of the system reaches the set value.

The control system of a cooling tower of the utility model generates negative pressure by vacuumizing the heat exchanger 511, and sucks the water in the second water inlet pipe 56 into the heat exchanger 511, which overcomes the problem of insufficient lift of the high-pressure water pump. In addition, the control system of a cooling tower of the present invention can automatically judge whether the cooling tower needs to be switched to the defogging state according to the season and temperature changes, thereby avoiding the uninterrupted operation of the damper motor 512 work, reducing energy consumption.

Inspired by the above-mentioned ideal embodiment according to the present utility model, through the above-mentioned description content, relevant staff can make various changes and modifications without departing from the scope of the present utility model. The technical scope of this utility model is not limited to the contents in the description, and its technical scope must be determined according to the scope of the claims.

Claims (10)

1. the control system of a cooling tower, it is characterized in that: comprise water tank (10), the water pump (20) connect with water tank (10) pipe, be connected to the vavuum pump (30) of water pump (20) one end, be connected to the vacuum tank (40) of vavuum pump (30) away from water pump (20) one end, and the cooling unit (50) to be connected with vacuum tank (40), described vacuum tank (40) to education and correction for juvenile offenders connects a cooling unit (50), cooling unit described in each (50) comprises cooling tower (51), be arranged at the heat exchanger (511) in cooling tower (51) outside, be arranged at the surge tank (52) of cooling tower (51) top and be connected to the below second water inlet pipe (56) of heat exchanger (511), described surge tank (52) is communicated with vacuum tank (40), surge tank (52) is also communicated with the highest point of heat exchanger (511), vavuum pump (30) can regulate the vacuum of vacuum tank (40), and then regulate the vacuum of surge tank (52), thus the water in the second water inlet pipe (56) is pumped in surge tank (52) through heat exchanger (511).

2. the control system of a kind of cooling tower as claimed in claim 1, is characterized in that: described surge tank (52) top is equipped with a pneumatic operated valve (521) controlling described surge tank (52) and open and close.

3. the control system of a kind of cooling tower as claimed in claim 1, it is characterized in that: described second water inlet pipe (56) is provided with the second electric butterfly valve (54), described second electric butterfly valve (54) can control water and rise in the second water inlet pipe (56).

4. the control system of a kind of cooling tower as claimed in claim 1, it is characterized in that: in this control system, also comprise steam-water separator (60), described steam-water separator (60) pipe is connected between water pump (20) and vavuum pump (30), and the water side of described steam-water separator (60) is divided no matter water receiving case (10) and vavuum pump (30).

5. the control system of a kind of cooling tower as claimed in claim 4, is characterized in that: water side pipe water receiving case (10) of described vavuum pump (30), vavuum pump (30) exhaust end pipe connects steam-water separator (60).

6. the control system of a kind of cooling tower as claimed in claim 1, is characterized in that: described vacuum tank (40) is also communicated with water tank (70), described water tank (70) joining water box (10).

7. the control system of a kind of cooling tower as claimed in claim 4, is characterized in that: described steam-water separator (60) is provided with the first liquid level gauge (61).

8. the control system of a kind of cooling tower as claimed in claim 1, is characterized in that: described surge tank (52) is provided with the second liquid level gauge (522), and described vacuum tank (40) is provided with vacuum meter (41).

9. the control system of a kind of cooling tower as claimed in claim 1, is characterized in that: the quantity of described vavuum pump (30) has two and is connected with vacuum tank (40) after parallel connection.

10. the control system of a kind of cooling tower as claimed in claim 1, is characterized in that: the quantity of described cooling unit (50) is four and is connected with vacuum tank (40) after parallel connection.