A cross-flow cooling tower with automatic defoaming function

Abstract

The invention discloses a cross-flow cooling tower with automatic defoaming function, which belongs to the technical field of cooling towers. A mechanical defoamer is arranged in the cooling tower, and at least two suction ports are arranged at the suction end branch of the mechanical defoamer, and the lower edge of the suction port of each branch is 20-30mm higher than the operating water level in the bottom basin of the cooling tower; at least two discharge ports are arranged at the discharge end branch of the mechanical defoamer, and the lower edge of each discharge port is submerged below the operating water level. It can automatically complete the defoaming treatment of the cooling tower without the need for a defoaming agent.

Description

Technical Field

[0001] The invention belongs to the technical field of cooling towers, in particular to a cross-flow cooling tower with an automatic defoaming function. Background Art

[0002] Cooling towers are devices that use water as a circulating coolant to absorb heat from the system and discharge it into the atmosphere to reduce the water temperature. They are widely used in many fields such as air conditioning, refrigeration, and chemical industries. Under certain water quality or process conditions in the circulation system of some industries, the circulating water in the cooling tower is prone to foaming.

[0003] Foam generated by circulating water has many hazards. It will affect the normal operation of the cooling tower liquid level switch, cause system misoperation, identify false liquid levels, and may cause the system to lack water and the water pump to run idle and be damaged; after a large amount of foam is generated, it fills the inside of the tower, seriously affecting the heat dissipation effect of the cooling tower, and also affects maintenance personnel from entering the cooling tower for maintenance activities; a large amount of foam overflows the cooling tower, accumulates around the cooling tower or flies in the air, polluting the environment.

[0004] Existing cooling towers usually use defoaming agents for defoaming, but in some specific industries, defoaming agents are highly selective. Improper selection cannot achieve the purpose of defoaming and is more likely to pollute the circulating water and fail to meet process requirements. Summary of the invention

[0005] In view of the above problems, the present invention provides a cross-flow cooling tower with automatic defoaming function, which can automatically and thoroughly complete the defoaming treatment of the cooling tower without the need for a defoaming agent.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a cross-flow cooling tower with automatic defoaming function, comprising a mechanical defoamer, a foam detection device, and a flushing system arranged in the cooling tower;

[0007] At least two suction ports are set on the suction end branch of the mechanical defoamer, and the lower edge of the suction port of each branch is 20-30mm above the operating water level in the bottom basin of the cooling tower; at least two discharge ports are set on the discharge end branch of the mechanical defoamer, and the lower edge of each discharge port is submerged below the operating water level;

[0008] The foam detection device includes a buoyancy device and a photoelectric beam switch;

[0009] The flushing system is arranged on the side of the bottom basin; the flushing system is a flushing pipe with a row of multiple flushing holes; a flushing pipe solenoid valve for controlling water flow is arranged at the water inlet of the flushing pipe;

[0010] The photoelectric radiation switch is connected to the mechanical defoamer and the flushing pipe electromagnetic valve.

[0011] As a further improvement of the above technical solution: the number of the suction ports is the same as the number of the discharge ports.

[0012] As a further improvement of the above technical solution: the discharge port is arranged away from the water outlet of the bottom basin; and the suction port is arranged close to the water outlet of the bottom basin.

[0013] As a further improvement of the above technical solution: the discharge outlet is in the shape of a circular tube, and a region close to the operating water level of the cooling tower is provided with small holes distributed along the circumference; and at least one row of holes is located above the operating water level of the cooling tower.

[0014] As a further improvement of the above technical solution: at least three sets of the foam detection devices are provided.

[0015] As a further improvement of the above technical solution: the buoyancy device includes positioning rods vertically arranged on the bottom basin; each positioning rod is provided with a floating ball which can rise and fall with the water level; the positioning rods are grouped into two, and the two floating balls on the same group of positioning rods are connected to each other by a connecting rod.

[0016] As a further improvement of the above technical solution: the photoelectric beam switch is arranged on the connecting rod at a distance, and the photoelectric beam switch is arranged at a height of -mm from the operating water surface of the cooling tower.

[0017] As a further improvement of the above technical solution: the photoelectric radiation switch is interconnected with the mechanical defoamer and the flushing pipe solenoid valve; when there is foam on the liquid surface between any photoelectric radiation switches blocking the incident light, the mechanical defoamer is started for 30 minutes and the flushing pipe solenoid valve provided on the flushing system is opened for 30 minutes.

[0018] As a further improvement of the above technical solution: an automatic drainage system is arranged near the water outlet of the bottom basin of the cooling tower, and the automatic drainage system consists of an automatic drainage interface and a drain pipe solenoid valve; the photoelectric beam switch and the drain pipe solenoid valve are interconnected; when the three groups of photoelectric beam switches are blocked by liquid surface foam at the same time, the drain pipe solenoid valve is activated for 30 minutes.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] The cooling tower involved in the present invention is internally provided with a defoaming mechanism and a foam detection system, a flushing system is provided on the upper edge of the bottom basin at the cooling tower inlet, and an automatic drainage system is provided near the water outlet of the bottom basin of the cooling tower. When a certain amount of foam is detected to be accumulated in the bottom basin of the cooling tower by the photoelectric switch provided by the foam detection system, the defoaming device and the flushing system are started to automatically complete the defoaming of the cooling tower. When a certain amount of foam is detected at the positions of the three photoelectric switches in the bottom basin of the cooling tower by the photoelectric switch provided by the foam detection system, the automatic drainage system is started, and at the same time, the automatic water replenishment system provided as standard for cooling is automatically replenished to reduce the concentration of substances that cause foam generation in the circulating water system of the cooling tower, so as to reduce the generation of foam when the system is running. The reasonable combination of the above-mentioned multiple systems or devices eliminates or reduces the influence of foam on the normal operation of the cooling tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure after the present invention is installed;

[0022] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the foam detection device;

[0024] Figure 4 It is a structural schematic diagram of a defoamer;

[0025] Figure 5 This is a schematic diagram of the flushing system structure;

[0026] Figure 6 It is a structural diagram of the automatic drainage system;

[0027] Figure 7 Run the control flow chart for the defoamer.

[0028] In the figure: 1. Filler; 2. Bottom basin; 3. Mechanical defoamer; 4. Suction port; 5. Discharge port; 6. Flushing pipe solenoid valve; 7. Flushing pipe; 8. Flushing hole; 9. Photoelectric beam switch; 10. Connecting rod; 11. Float; 12. Positioning rod; 13. Flushing system; 14. Automatic drainage system; 15. Automatic drainage interface; 16. Drainage pipe solenoid valve. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0030] See also Figures 1 to 5, In a specific embodiment, a cross-flow cooling tower with automatic defoaming function includes a mechanical defoamer 3, a foam detection device, and a flushing system 13 arranged in the cooling tower;

[0031] At least two suction ports 4 are provided at the suction end branch of the mechanical defoamer 3, and the lower edge of the suction port 4 of each branch is 20-30 mm above the operating water level in the bottom basin 2 of the cooling tower; at least two discharge ports 5 are provided at the discharge end branch of the mechanical defoamer 3, and the lower edge of each discharge port 5 is submerged below the operating water level;

[0032] like Figure 3 As shown, in order to realize automatic monitoring and defoaming treatment, the above embodiment is further optimized: at least one set of foam detection device is arranged inside the cooling tower, and each set of foam detection device includes a buoyancy device and a photoelectric beam switch 9. The amount of foam generated is monitored by the foam monitoring device, and when the amount of foam generated reaches the set value, the defoamer can be started to perform defoaming treatment.

[0033] like Figure 2 , 5 As shown, in order to completely remove the foam on the operating water level, the water flow discharged by the flushing system automatically impacts the foam to the vicinity of the defoamer, which is convenient for the defoamer to remove the foam. It is further optimized on the basis of the above embodiment: a flushing system 13 is arranged at the upper edge of the side of the bottom basin, close to the air inlet of the filler 1; the flushing system 13 is a flushing pipe 7 with a row of multiple flushing holes 8; the water inlet of the flushing pipe 7 is provided with a flushing pipe solenoid valve 6 for controlling the water flow interruption.

[0034] The photoelectric radiation switch 9 is connected to the mechanical defoamer 3 and the flushing pipe electromagnetic valve 6 .

[0035] Since the foaming height of the cooling tower is at least 20-30 mm above the operating water level, the height of the suction port 4 is also set to be 20-30 mm above the operating water level.

[0036] The principle of the present invention is to actively suck the liquid with foam into the mechanical defoamer for defoaming treatment to achieve complete removal of foam. The liquid coming out of the mechanical defoamer is directly immersed below the operating water level to complete the removal of foam.

[0037] like Figure 4 As shown, in order to achieve flow balance between the amount of water sucked in and the amount of water discharged, further optimization is performed based on the above embodiment: the number of the suction ports 4 is the same as the number of the discharge ports 5 .

[0038] Since the foam of the cooling tower is mainly concentrated at the water outlet of the bottom basin, further optimization is performed based on the above embodiment: the discharge port 5 is arranged away from the water outlet of the bottom basin 2; the suction port 4 is arranged close to the water outlet of the bottom basin 2.

[0039] like Figure 4 As shown, in order to improve the defoaming effect, the above embodiment is further optimized: the discharge port 5 is in the shape of a circular tube, and the area close to the operating water level of the cooling tower is provided with small holes distributed along the circumference; at least one row of holes is above the operating water level of the cooling tower. By providing small holes on the circular tube of the discharge port 5, the excess air generated by the foam can be eliminated and the foaming rate can be reduced.

[0040] like Figure 3 As shown, the above embodiment is further optimized: the buoyancy device includes a positioning rod 12 vertically arranged on the bottom basin 2; each positioning rod 12 is sleeved with a floating ball 11 that can rise and fall with the water level; the positioning rods 12 are grouped in pairs, and the two floating balls 11 on the same group of positioning rods 12 are connected to each other through a connecting rod 10. The floating ball automatically tracks the changes in the operating water level to ensure that the photoelectric beam switch always maintains a stable distance from the operating water level.

[0041] In a preferred embodiment, at least three sets of foam detection devices are provided.

[0042] like Figure 3 As shown, the above embodiment is further optimized: the photoelectric beam switch 9 is arranged on the connecting rod 10 at a distance, and the photoelectric beam switch 9 is arranged at a height of 20-30 mm from the operating water surface of the cooling tower.

[0043] Further optimization is performed on the basis of the above embodiment: the photoelectric opposing switch 9 is interconnected with the mechanical defoamer 3 and the flushing pipe solenoid valve 6; when there is foam on the liquid surface between the opposing photoelectric opposing switches blocking the opposing light, the mechanical defoamer is started and the flushing pipe solenoid valve provided on the flushing system is opened.

[0044] like Figure 6 As shown, the above embodiment is further optimized: an automatic drainage system 14 is arranged near the water outlet of the cooling tower bottom basin, and the automatic drainage system 14 is composed of an automatic drainage interface 15 and a drain pipe solenoid valve 16; the photoelectric beam switch 9 is connected to the drain pipe solenoid valve 16; when the three groups of photoelectric beam switches are blocked by liquid surface foam at the same time, the drain pipe solenoid valve is started for 30 minutes.

[0045] The specific working principle of the present invention is:

[0046] The suction port 4 sucks the foam on the bottom basin 2 into the mechanical defoamer to eliminate the foam, and directly discharges the liquid after the foam is removed to below the operating water level through the discharge port 5; the float 11 automatically tracks the changes in the operating water level to ensure that the photoelectric radiation switch 9 always maintains a constant height with the operating water level.

[0047] like Figure 7 As shown, during the operation of the cooling tower, when there is excessive foam, it will rise above the water surface. At this time, the foam blocks any photoelectric switch 9. The photoelectric switch 9 starts the mechanical defoamer and the flushing pipe electromagnetic valve through the control system, and the mechanical defoamer starts to work and continues to run for 30 minutes. After the flushing pipe electromagnetic valve 6 is started, the cleaning pipe 7 is opened; the outer wall of the cleaning pipe 7 is distributed with flushing holes, which generate impact water flow to flush the foam into the center of the bottom basin, making it easier for the mechanical defoamer to remove the foam.

[0048] The mechanical defoamer and the flushing pipe solenoid valve 6 are started for 30 minutes and then stopped; after 30 minutes, when there is no foam to cover the photoelectric beam switch 9, the photoelectric beam switch 9 does not send a signal, and the mechanical defoamer remains in a non-operating state.

[0049] When the three groups of photoelectric switches are blocked from shooting light by liquid foam at the same time, the automatic drainage system 14 is started, and the drain pipe solenoid valve is started for 30 minutes. At the same time, the automatic water replenishment system provided as standard for cooling is used to automatically replenish water, so as to reduce the concentration of substances that cause foam in the cooling tower circulating water system, so as to reduce the generation of foam during system operation.

[0050] When the cooling tower is not in operation, the defoaming system is in a stopped state.

[0051] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0052] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A cross-flow cooling tower with automatic defoaming function, characterized in that: It comprises a mechanical defoamer (3) arranged in a cooling tower, a foam detection device, and a flushing system (13); At least two suction ports (4) are provided on the suction end branch of the mechanical defoamer (3), and the lower edge of each suction port (4) is 20-30 mm above the operating water level in the bottom basin (2) of the cooling tower; at least two discharge ports (5) are provided on the discharge end branch of the mechanical defoamer (3), and the lower edge of each discharge port (5) is submerged below the operating water level; The foam detection device comprises a buoyancy device and a photoelectric beam switch (9); The flushing system (13) is arranged on the side of the bottom basin; the flushing system (13) is a flushing pipe (7) having a row of multiple flushing holes (8); a flushing pipe solenoid valve (6) for controlling water flow interruption is arranged at the water inlet of the flushing pipe (7); The photoelectric radiation switch (9) is interconnected with the mechanical defoamer (3) and the flushing pipe solenoid valve (6); The buoyancy device comprises positioning rods (12) vertically arranged on the bottom basin (2); each positioning rod (12) is sleeved with a floating ball (11) that can rise and fall with the water level; the positioning rods (12) are grouped in pairs, and the two floating balls (11) on the same group of positioning rods (12) are connected to each other via a connecting rod (10); The photoelectric opposing switches (9) are arranged on the connecting rod (10) at intervals.

2. A cross-flow cooling tower with automatic defoaming function according to claim 1, characterized in that: The number of the suction ports (4) is the same as the number of the discharge ports (5).

3. A cross-flow cooling tower with automatic defoaming function according to claim 1, characterized in that: The discharge port (5) is arranged away from the water outlet of the bottom basin (2); and the suction port (4) is arranged close to the water outlet of the bottom basin (2).

4. A cross-flow cooling tower with automatic defoaming function according to claim 1, characterized in that: The discharge port (5) is in the shape of a circular tube, and a region close to the operating water level of the cooling tower is provided with small holes distributed along the circumference; at least one row of holes is located above the operating water level of the cooling tower.

5. A cross-flow cooling tower with automatic defoaming function according to claim 1, characterized in that: At least three sets of foam detection devices are provided.

6. A cross-flow cooling tower with automatic defoaming function according to claim 1, characterized in that: The photoelectric beam switch (9) is arranged at a height of 20-30 mm from the operating water surface of the cooling tower.

7. A cross-flow cooling tower with automatic defoaming function according to claim 1, characterized in that: The flushing system (13) is arranged near the air inlet of the filler (1).

8. The cross-flow cooling tower with automatic defoaming function according to claim 1, characterized in that: An automatic drainage system (14) is provided at the water outlet of the bottom basin (2) of the cooling tower. The automatic drainage system (14) is composed of an automatic drainage interface (15) and a drainage pipe electromagnetic valve (16); the photoelectric radiation switch (9) is connected to the drainage pipe electromagnetic valve (16).

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