A fog-eliminating cooling tower

Abstract

The present invention discloses a fog-eliminating cooling tower, which includes a tower frame, a water collecting tank, a water distribution device, packing, a water baffle, a fan, and a wet and dry bulb temperature monitoring device. There is a heat exchange module with a transformable channel and an adjustment mechanism for controlling the channel transformation between the water baffle and the fan. The heat exchange module includes a horizontally arranged cold air pipe group, which is composed of a group of cold air pipes that are parallel to each other and have an equal distance between them. Both ends of each cold air pipe are respectively connected to a wind valve arranged on the tower frame. The two side surfaces are composed of heat conduction plates. The lower side has a lower valve plate, and the upper side is provided with upper valve plates at positions close to both ends, and a certain proportion of the middle part is left empty. The adjustment mechanism includes that all the lower valve plates are connected in series with a lower operating rod, and all the upper valve plates are connected in series with an upper operating rod. The transformable channel includes opening the upper valve plate and the lower valve plate while closing the wind valves at both ends of each cold air pipe, or closing the upper valve plate and the lower valve plate while opening the wind valves at both ends of each cold air pipe.

Description

Technical Field

[0001] The present invention belongs to the technical field of cooling towers, and particularly relates to a water-saving and fog-eliminating cooling tower. Background Art

[0002] With the progress of science and technology and the development of the economy, people's demand for fog-eliminating cooling towers has gradually increased. Currently, the common fog-eliminating cooling tower types are mainly the following two. One is the dry-wet combined operation cooling tower, and the other is the fixed condensation type fog-eliminating cooling tower. For the dry-wet combined operation cooling tower, its disadvantage is that the fins in the dry area are easily fouled and blocked by impurities in the air, resulting in a sharp increase in the fluid operation resistance. The power consumption will increase due to the increase in resistance. The potential risk is that the fan motor operates with over-power, and in severe cases, it will endanger the equipment safety and cause system operation risks; for the fixed condensation type fog-eliminating cooling tower, its principle is to install a fixed-structured heat exchange module in the tower. There are different flow channels for the cold air and the humid and hot air inside the heat exchange module. Specifically, the module provides an air flow channel for the humid and hot air and an air flow channel for the cold air. The two channels in the heat exchange module do not communicate with each other and only conduct heat exchange through the tube wall. In this module, since the humid and hot air is cooled, its saturation point decreases and moisture condenses and precipitates, and the moisture content decreases accordingly. The cold air at low temperature in the module is heated, but the moisture content remains unchanged and the relative humidity decreases, and it is further away from the saturation zone than before entering the module; the problem with this mode is that this fixed-structured heat exchange module is installed in the cooling tower. When the system is in the non-fog-eliminating operation period, due to its fixed structure, it will inevitably be ineffective and occupy space, reducing the flow channel of the humid and hot air, resulting in an increase in the resistance of the fan operation, and correspondingly increasing the energy consumption of the cooling tower. Summary of the Invention

[0003] The purpose of the present invention is to overcome the structural defect of the existing cooling tower fog-eliminating device that still occupies space during the non-fog-eliminating period, resulting in reduced energy efficiency, and to provide a fog-eliminating cooling tower device composed of a heat exchange module with variable channels, which not only saves water and purifies the environment, but also can save energy and improve efficiency, and has a simple structure and convenient operation.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A fog-eliminating cooling tower, comprising a tower frame, a water collecting tank, a water distribution device, a filler, a water baffle, a fan and a wet and dry bulb temperature monitoring device. It is characterized in that a heat exchange module with a changeable channel and a matching adjusting mechanism for controlling the channel change are arranged between the water baffle and the fan; the heat exchange module includes a horizontally arranged cold air pipe group, which is composed of a group of cold air pipes that are parallel to each other and have an equal distance between them. Both ends of each cold air pipe are connected to air valves arranged on the tower frame; both side surfaces of each cold air pipe are composed of heat conduction plates; a lower valve plate is arranged on the lower side of each cold air pipe; upper valve plates are arranged at the positions near both ends of the upper side of each cold air pipe, and a part accounting for a certain proportion of the entire length of the cold air pipe is left empty in the middle part; the adjusting mechanism includes that all the lower valve plates are connected in series with a lower operating rod that can uniformly control the opening or closing of all the lower valve plates, and all the upper valve plates are connected in series with an upper operating rod that can uniformly control the opening or closing of all the upper valve plates; the changeable channel includes opening the upper valve plate and the lower valve plate while closing the air valves at both ends of each cold air pipe, or closing the upper valve plate and the lower valve plate while opening the air valves at both ends of each cold air pipe.

[0006] The interior of this cooling tower is equipped with a heat exchange module more than a general cooling tower, and at the same time, the adjustment structure is also increased. When the cooling tower does not need to eliminate fog in summer, it can control that each air flow channel is passed by humid and hot air. The flow area is maximized and the operation resistance is small. When eliminating fog in winter, a certain area of voids is set according to the balance of air flow resistance and heat balance during air flow. Therefore, it can ensure that the cold air has sufficient heat exchange area with the humid and hot air throughout the whole process, and will not increase the air passing resistance during the operation of the fan, achieving the effects of fog elimination, water saving and energy saving.

[0007] In a preferred solution, the heat conduction plates on both side surfaces of each cold air pipe are corrugated plates, and the corrugation direction is horizontally distributed.

[0008] In a preferred solution, a part accounting for 40 - 50% of the entire length of the cold air pipe is left empty in the middle part of the upper side of each cold air pipe.

[0009] In a preferred solution, the control device of the air valve is connected to the output end of the wet and dry bulb temperature monitoring device arranged at the outlet of the cooling tower, and the opening angle of the valve flap of the air valve is dynamically adjusted accordingly according to the monitoring value of the wet and dry bulb temperature monitoring device.

[0010] In a preferred solution, an upper operation rotating wheel is connected to the end of the upper operating rod, and there are scales indicating the adjustment angle on the upper operation rotating wheel; a lower operation rotating wheel is connected to the end of the lower operating rod, and there are scales indicating the adjustment angle on the lower operation rotating wheel.

[0011] In a preferred solution, the lower operation rotating wheel and the upper operation rotating wheel are composed of gears with the same structure, and are manually or electrically synchronously operated through an intermediate transmission gear.

[0012] Preferably, a blower is provided on the side of the tower and connected to the cold air pipe through a wind valve.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. The heat exchange module placed in the cooling tower of the present invention is designed with a structure of variable channels. When fog elimination is required, it forms a heat exchanger. When fog elimination is not required, the valve can be controlled to change the structure, so that the original heat exchange pipes become conventional humid and hot gas flow channels, thus completely avoiding the defect that the heat exchange module in the prior art does not play a role during non-fog elimination periods and still occupies the gas flow channel, resulting in a large operating resistance.

[0015] 2. When the fogging state is not very serious, by appropriately adjusting the upper and lower valve plates and the angle of the end wind valve, it is coordinated with the overall operating state of the cooling tower and has the best comprehensive performance, including cooling, water saving, fog elimination, energy saving and environmental purification;

[0016] 3. Changing the structure during non-fog elimination periods reduces the flow resistance of the humid and hot air flow, which is also beneficial to energy saving;

[0017] 4. The valve control is connected to the output end of the dry and wet bulb temperature monitoring device to achieve automatic control;

[0018] 5. The pipe structure adopts a transverse corrugated plate, which effectively increases the heat exchange area and improves the heat exchange effect. Its bent part has a more significant effect of intercepting water droplets on the secondary circulation induced by the humid and hot air flow flowing longitudinally on the surface of the corrugated plate;

[0019] 6. It can be simply operated manually and is convenient to operate;

[0020] 7. The structure is simple and the manufacturing cost is low. Description of the Drawings

[0021] Figure 1 is the main front view schematic diagram of the structure of an embodiment of the present invention in a non-fog elimination state;

[0022] Figure 2 is Figure 1 the left view schematic diagram of

[0023] Figure 3 is Figure 1 the top view schematic diagram of

[0024] Figure 4 is Figure 1 the schematic diagram of the structure of the device in

[0025] Figure 5 is Figure 4 the left view schematic diagram of

[0026] Figure 6 isFigure 5 Top view schematic diagram;

[0027] Figure 7 is Figure 5 Partial enlarged schematic diagram at position A in

[0028] Figure 8 is Figure 5 Partial enlarged schematic diagram at position B in

[0029] Figure 9 Schematic diagram of the operating state of the device in this embodiment.

[0030] In the figure: tower 1; water collecting tank 2; water distribution device 3; packing 4; water baffle 5; fan 6; heat exchange module 7; cold air pipe group 8; cold air pipe 9; air valve 10; corrugated plate 11; lower valve plate 12; upper valve plate 13; lower operating rod 14; upper operating rod 15; state ①; state ②; state ③; state ④; state ⑤; area I is the supersaturated area; area II is the unsaturated area; line C is the saturation line. Specific implementation mode

[0031] The following will describe the embodiments of the present invention in detail with reference to the accompanying drawings: This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0032] Embodiment 1: A fog-eliminating cooling tower includes a tower 1, a water collecting tank 2, a water distribution device 3, a packing 4, a water baffle 5, a fan 6 and a wet and dry bulb temperature monitoring device. A heat exchange module 7 with a variable channel and an adjustment mechanism for controlling the channel change are arranged between the water baffle 5 and the fan 6. See Figure 1 . The heat exchange module 7 includes a horizontally arranged cold air pipe group 8, and the cold air pipe group 8 is composed of a group of cold air pipes 9 that are parallel to each other and have an equal distance between them. Both ends of each cold air pipe 9 are connected to an air valve 10 arranged on the tower 1. See Figure 2 . Both side surfaces of each cold air pipe 9 are composed of heat conduction plates. The heat conduction plates are made of anti-corrosion metal thin plates pressed into corrugated plates 11, and then assembled into units and then assembled into cold air pipes 9. The corrugation direction of the corrugated plates 11 is horizontally distributed relative to the cooling tower, and the corrugations are circular arcs or sine waves. A lower valve plate 12 is arranged on the lower side of each cold air pipe 9; upper valve plates 13 are arranged at the positions near both ends on the upper side of each cold air pipe 9, and there is a part with a length of 40 - 50% of the entire cold air pipe 9 left empty in the middle part, that is, the upper valve plate 13 is not installed. The adjustment mechanism includes that all the lower valve plates 12 are connected in series with a lower operating rod 14 that can uniformly control the opening or closing of all the lower valve plates 12, and all the upper valve plates 13 are connected in series with an upper operating rod 15 that can uniformly control the opening or closing of all the upper valve plates 13. See Figure 3 .

[0033] The transformation channel includes opening the upper valve plate 13 and the lower valve plate 12 while closing the air valves 10 at both ends of each cold air pipe 9, or closing the upper valve plate 13 and the lower valve plate 12 while opening the air valves 10 at both ends of each cold air pipe 9. Refer to Figure 4 , Figure 5 , Figure 6 . Among them, Figure 6 shows that there is no upper valve plate in the middle of the cold air pipe 9. The ends of the upper operating rod 15 and the lower operating rod 14 are both exposed outside the tower 1. The end of the upper operating rod 15 is connected with an upper operating runner, and there are scales indicating the adjustment angle on the upper operating runner; the end of the lower operating rod 14 is connected with a lower operating runner, and there are scales indicating the adjustment angle on the lower operating runner. Refer to Figure 7 , Figure 8 . The control device of the air valve 10 is connected to the output end of the dry and wet bulb temperature monitoring device arranged at the outlet of the cooling tower. The opening angle of the valve flap of the air valve 10 is dynamically adjusted accordingly according to the monitored value of the dry and wet bulb temperature at the outlet.

[0034] Compared with the interior of a traditional general cooling tower, this demisting cooling tower is equipped with a heat exchange module 7. Compared with the existing demisting cooling towers, the prominent feature of this device is that the heat exchange device is provided with a transformable structure. The significant advantage of this device is that when the cooling tower operates in seasons such as summer, that is, during the period when demisting is not required, opening the upper valve plate 13 and the lower valve plate 12 while closing the air valves 10 at both ends of each cold air pipe 9 can change each horizontal cold air channel into a vertical channel for humid and hot air. Therefore, it does not have the defect of large resistance to air flow increase during the operation of the fan as in the fixed heat exchange module of the prior art, and has the effects of demisting, water saving and energy saving.

[0035] When the cooling tower is in the demisting operation period, by adjusting the air valve 10, the upper valve plate 13 and the lower valve plate 12, that is, closing the upper valve plate 13 and the lower valve plate 12 while opening the air valves 10 at both ends of each cold air pipe 9, relatively dry and cold air in the external environment enters the cold air pipe group 8 and exchanges heat with the humid and hot air flowing from the outside of the cold air pipe 9 from bottom to top. Also, since the two side plates of the cold air pipe 9 are horizontal corrugated plates 11, the bent parts not only have the effect of expanding the heat exchange area for the humid and hot air flowing longitudinally on the surface of the corrugated plates 11, but also can generate secondary circulation due to the bent parts to separate out water droplets. Moreover, during the demisting process, the water droplets formed by the condensation of the humid and hot air due to temperature reduction are intercepted by the existence of the arc-shaped surface and are not easily blown out of the tower by the wind.

[0036] The rotation angles of the air valve 10, the upper valve plate 13 and the lower valve plate 12 can be adjusted steplessly manually or automatically according to the monitored value of the dry and wet bulb temperatures of the outlet air during operation, so as to appropriately improve the defogging effect and comprehensively balance defogging and reducing air flow resistance. When the air valve 10, the upper valve plate 13 and the lower valve plate 12 are partially opened, the air flow passing through the cold air pipe 9 is a mixed air flow of dry cold gas and humid hot air flow, and the mixed air flow also has the effect of cooling the humid hot air flow and defogging.

[0037] The following briefly describes the operating state of the device in conjunction with the attached Figure 9 Brief description of the operating state of this device:

[0038] In the defogging state, after the air passes through the air valve 10 in state ① and obtains the heat in state ②, it becomes state ④; the air at the lower part of the cooling tower is also in state ①, and after contacting with water, it absorbs heat and incorporates water vapor and becomes state ②; state ② is cooled by the cold air on the side wall of the cold air pipe 9 in the defogging unit and becomes state ③, and water droplets condense during this process. It drops along the wall surface of the defogging unit into the cooling tower.

[0039] The air in state ③ and state ④ are mixed to become the air in state ⑤, which is taken out of the air duct by the operation of the cooling tower fan 6 and finally discharged into the atmosphere. Figure 7 In the figure, area Ⅰ is the supersaturated area, area Ⅱ is the unsaturated area, and line C is the saturation line.

[0040] Embodiment 2: The lower operating runner and the upper operating runner are composed of gears with the same structure, and are synchronously operated electrically or manually through an intermediate transmission gear. The rest of the structure is the same as that of Embodiment 1.

[0041] Embodiment 3: A blower is provided on the side of the tower frame 1 and is connected to the cold air pipe 9 through the air valve 10. The rest of the structure is the same as that of Embodiment 1 or Embodiment 2.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A fog-eliminating cooling tower, comprising a tower frame, a water collecting tank, a water distribution device, packing, a water baffle, a fan and a wet and dry bulb temperature monitoring device, characterized in that There is a heat exchange module with a transformable channel and a matching adjustment mechanism for controlling the channel transformation between the water baffle and the fan; the heat exchange module includes a horizontally arranged cold air pipe group, which is composed of a group of cold air pipes that are parallel to each other and have an equal distance between them. The two ends of each cold air pipe are respectively connected to the air valves arranged on the tower frame; the two side surfaces of each cold air pipe are composed of heat conduction plates; a lower valve plate is arranged on the lower side of each cold air pipe; upper valve plates are arranged at the positions near the two ends on the upper side of each cold air pipe, and a part accounting for a certain proportion of the entire length of the cold air pipe is left empty in the middle part; the adjustment mechanism includes that all the lower valve plates are connected in series with a lower operating rod that can uniformly control the opening or closing of all the lower valve plates, and all the upper valve plates are connected in series with an upper operating rod that can uniformly control the opening or closing of all the upper valve plates; the transformable channel includes opening the upper valve plate and the lower valve plate while closing the air valves at both ends of each cold air pipe, or closing the upper valve plate and the lower valve plate while opening the air valves at both ends of each cold air pipe.

2. The fog-eliminating cooling tower according to claim 1, characterized in that, The heat conduction plates on the two side surfaces of each cold air pipe are corrugated plates, and the corrugation direction is horizontally distributed.

3. The fog-eliminating cooling tower according to claim 1, characterized in that, In the middle part on the upper side of each cold air pipe, a part accounting for 40 - 50% of the entire length of the cold air pipe is left empty and no upper valve plate is installed.

4. The fog-eliminating cooling tower according to claim 3, characterized in that, The control device of the air valve is connected to the output end of the dry and wet bulb temperature monitoring device arranged at the outlet of the cooling tower, and the opening angle of the valve flap of the air valve is dynamically adjusted accordingly according to the monitoring value of the dry and wet bulb temperature monitoring device.

5. The fog-eliminating cooling tower according to claim 4, characterized in that, An upper operating runner is connected to the end of the upper operating rod, and there are scales indicating the adjustment angle on the upper operating runner; a lower operating runner is connected to the end of the lower operating rod, and there are scales indicating the adjustment angle on the lower operating runner.

6. The fog-eliminating cooling tower according to claim 5, characterized in that, The lower operating runner and the upper operating runner are composed of gears with the same structure, and are manually or electrically operated synchronously through an intermediate transmission gear.

7. The fog-eliminating cooling tower according to claim 6, characterized in that, A blower is arranged on the side of the tower frame and is connected to the cold air pipe through an air valve.

Images