Hybrid cross-flow enhanced condensation mist eliminator

Abstract

The present application relates to a kind of mixed cross flow enhanced condensation mist eliminator, including vane unit in the main flow path of cooling tower, secondary air inlet unit is arranged on the outer side of the side wall of main flow path two sides, vane unit: by several arc vane of interval side by side, arc flow path of wet hot air flow is formed between adjacent arc vane, the top surface of the convex part of arc vane is provided with water hook facing the direction of airflow entering, the surface of arc vane is provided with spoiler rib, the dry cold air flow from the secondary air inlet unit is arranged with 30 °~60 ° oblique angle at the spoiler rib;Secondary air inlet unit: with secondary air inlet and louvre group, secondary air inlet is fixed in the outer part of the side wall of cooling tower, louvre group is located in the interior of secondary air inlet.The present application directly contacts and mixes saturated wet hot air and secondary dry cold air, realizes the function integration of temperature reduction, humidity reduction, water collection in limited space, makes the mist elimination and energy consumption performance of mechanical ventilation cooling tower synchronous promotion.

Description

Technical Field

[0001] This invention relates to the field of cooling tower technology, and in particular to a hybrid cross-flow enhanced condensation and demisting device. Background Technology

[0002] Mechanical ventilation cooling towers have strict requirements for fog elimination performance in order to save water resources and reduce the negative impact on the surrounding ecological environment.

[0003] Conventional mechanical ventilation cooling towers rely on water collectors for mist elimination. However, water collectors can only intercept inertial droplets in humid air. When saturated humid air comes into contact with the outside air at the fan outlet, it will still generate a large amount of mist.

[0004] Currently, a further method to reduce cooling tower outlet plumes is to install a condenser inside the tower. The introduced dry, cold outside air and the rising saturated, humid, hot air undergo indirect heat exchange within the condenser. After the humid, hot air cools down, it mixes with the returning dry, cold air in the upper transition section, further reducing its saturation. This method has two problems: first, installing a condenser occupies additional space within the tower, resulting in higher modification or initial commissioning costs; second, the indirect heat exchange is inefficient, and the temperature drop of the humid, hot air is relatively small.

[0005] To save space, some have tried to remove the conventional water collector and keep only the condenser. However, the condenser is not very efficient at intercepting inertial droplets. Although it reduces the saturation of the humid air, it brings back the problem of drift droplet loss. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: in order to overcome the shortcomings of the prior art, the present invention provides a hybrid cross-flow enhanced condensation and defogging device to solve the problem that it is difficult to effectively balance water collection, defogging, and space cost in mechanical ventilation cooling towers.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a hybrid cross-flow enhanced condensation and defogging device, including a blade unit for condensation and water collection and a secondary air intake unit. The blade unit is located in the main channel of the cooling tower, and the secondary air intake unit is located on the outer side surface of the cooling tower sidewall on both sides of the main channel.

[0008] Blade unit: It consists of several arc-shaped blades arranged side by side at a distance. An arc-shaped flow channel for the flow of hot and humid air is formed between adjacent arc-shaped blades. The top surface of the convex part of the arc-shaped blade is provided with a water-blocking hook facing the direction of airflow entry. The surface array of the arc-shaped blade is provided with a flow-deflecting rib. The flow-deflecting rib is at an angle of 30° to 60° with the direction of the dry and cold air flow from the secondary air intake unit.

[0009] Secondary air inlet unit: with secondary air inlet and louver group, the secondary air inlet is fixed on the outside of the cooling tower side wall, and the louver group is located inside the secondary air inlet.

[0010] Specifically, the spoiler rib includes a first spoiler rib, a second spoiler rib and a third spoiler rib, the first spoiler rib is fixed at the front end of the windward surface of the convex part of the arc-shaped blade, the second spoiler rib is fixed at the windward surface of the convex part of the arc-shaped blade between the first spoiler rib and the water retaining hook, and the third spoiler rib is fixed on the surface of the concave part of the arc-shaped blade and located at the rear end of the water retaining hook.

[0011] Further, the rib width, height and length of the first spoiler rib are the same as the thickness of the base body of the arc-shaped blade, and the distance between adjacent ribs of the first spoiler rib is 8-12 times the height of the rib.

[0012] Further, the rib width of the second spoiler rib is equal to the thickness of the base body of the arc-shaped blade, the rib length of the second spoiler rib is the same as the length of the water retaining hook, the rib height of the second spoiler rib is the same as the thickness of the base body of the arc-shaped blade but not higher than the height of the water retaining hook, and the distance between adjacent ribs of the second spoiler rib is 8-12 times the height of the rib.

[0013] Further, the width of the third spoiler rib is consistent with the width of the first spoiler rib, the height of the third spoiler rib is higher than the height of the first spoiler rib, the length of the third spoiler rib is greater than the length of the first spoiler rib, and the distance between adjacent ribs of the third spoiler rib is 8-12 times the height of the rib.

[0014] The beneficial effects of the present application are:

[0015] 1. The present application changes the traditional partition type condensation into direct contact mixing of secondary dry cold air and rising hot and humid air, and the main flow directions of the cold air and the hot air are staggered at 90°, thereby greatly improving the condensation efficiency.

[0016] 2. The present application retains the arc-shaped flow channel structure of the blade unit, does not sacrifice water collection performance due to the implementation of condensation, and the water retaining hook can effectively suppress the secondary entrainment phenomenon caused by liquid film breakage and reduce the loss of floating drops.

[0017] 3. The present application ingeniously utilizes the convective heat transfer characteristics of the arc-shaped blade itself for water collection, and the array of obliquely arranged spoiler ribs on the surface of the base body of the arc-shaped blade further promotes the temperature drop of the main flow of hot and humid air and the precipitation of liquid drops.

[0018] 4. The present application integrates cooling, dehumidification and water collection functions in the same component, significantly improving the space utilization and structural compactness of the cooling tower. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the external structure of the present invention.

[0021] Figure 2 This is a front view structural diagram of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the arc-shaped blades that constitute the arc-shaped flow channel in this invention.

[0023] Figure 4 This is a partial schematic diagram of the arc-shaped blade protrusion described in this invention.

[0024] Figure 5 This is a partial schematic diagram of the concave portion of the arc-shaped blade described in this invention.

[0025] Figure 6 This is a schematic diagram of the blade unit described in this invention.

[0026] In the diagram: 1. Arc-shaped blade, 2. Arc-shaped flow channel, 3. Water-blocking hook, 4. First turbulence rib, 5. Second turbulence rib, 6. Third turbulence rib, 7. Louver group, 8. Secondary air intake duct, 9. Cooling tower sidewall, 10. Main flow channel. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0028] like Figure 1 , Figure 2 The hybrid cross-flow enhanced condensation and demisting device shown comprises a blade unit for condensate collection and a secondary air intake unit. The blade unit is located within the main flow channel 10 formed by the cooling tower sidewall 9, and the secondary air intake unit is located on the outer surfaces of the cooling tower sidewall 9 on both sides of the main flow channel 10. Saturated humid and hot air generated by the cooling tower packing passes from bottom to top through the blade unit within the main flow channel 10, while dry and cold air from the outside enters the main flow channel 10 laterally through the secondary air intake unit.

[0029] Figure 2 The arrows in the diagram indicate the directions of three main streams: saturated humid and hot air from the packing material, dry and cold air from the outside, and unsaturated air whose temperature has decreased after mixing.

[0030] like Figures 3-6 As shown, the blade unit consists of several arc-shaped blades 1 arranged side by side at a certain distance, and an arc-shaped flow channel 2 for the flow of hot and humid air is formed between adjacent arc-shaped blades 1.

[0031] Since the secondary entrainment phenomenon caused by liquid film break-up is concentrated at the top of the convex portion of the curved blade 1, a water baffle hook 3 is fixed to the surface of the top of the convex portion of the curved blade 1 and faces the direction of the saturated hot and humid air flow.

[0032] A turbulence rib is arranged on the surface of the curved blade 1, and the arrangement direction of the turbulence rib is at an angle of 30°-60° with the dry cold air flow direction from the secondary air inlet unit. After the turbulence rib is arranged at an angle, a continuous strong spiral longitudinal vortex is generated on the surface of the curved blade 1, the mixing and heat exchange between the cold and hot fluids are strengthened, and the liquid droplet precipitation on the surface of the curved blade 1 is promoted.

[0033] The turbulence rib includes a first turbulence rib 4, a second turbulence rib 5, and a third turbulence rib 6 which are arranged in an array.

[0034] The first turbulence rib 4 is fixed to the front end of the windward surface of the convex portion of the curved blade 1, the rib width, height, and length of the first turbulence rib 4 are the same as the thickness of the base body of the curved blade 1, and the distance between adjacent ribs of the first turbulence rib 4 is 8-12 times the height of the rib. The function of the first turbulence rib 4 is to simultaneously generate a mixed longitudinal vortex adhering to the surface wall of the curved blade 1, strengthen the mixed convection heat transfer between the cold and hot fluids, and promote the temperature drop and liquid droplet precipitation of the saturated hot and humid air, by facing the mutually staggered lateral dry cold air secondary inlet and the upward main flow of the saturated hot and humid air. The related design of the rib size and the distance between adjacent ribs of the first turbulence rib 4 is to ensure that the wall-adhering longitudinal vortex maintains an effective size and strength.

[0035] The second turbulence rib 5 is fixed to the windward surface of the convex portion of the curved blade 1 between the first turbulence rib 4 and the water baffle hook 3, the rib width of the second turbulence rib 5 is equal to the thickness of the base body of the curved blade 1, the rib length of the second turbulence rib 5 is the same as the length of the water baffle hook 3, the rib height of the second turbulence rib 5 is the same as the thickness of the base body of the curved blade 1 but not higher than the height of the water baffle hook 3, and the distance between adjacent ribs of the second turbulence rib 5 is 8-12 times the height of the rib.

[0036] The basic function of the second turbulence rib 5 is also to generate a longitudinal vortex adhering to the surface wall of the curved blade 1 and promote the mixed convection heat transfer between the cold and hot fluids. The reason why the height of the second turbulence rib 5 is lower than the height of the water baffle hook 3 is to ensure that all the newly generated liquid droplets caused by the heat transfer enhancement of the second turbulence rib 5 enter the water baffle hook 3 for recovery. The design of the other related sizes of the second turbulence rib 5 is also to ensure that the wall-adhering longitudinal vortex maintains an effective size and strength.

[0037] After the saturated hot and humid air passes through the first turbulence rib 4 and the second turbulence rib 5, a large number of precipitated liquid droplets are intercepted and collected by the water baffle hook 3, realizing the synergistic effect of the turbulence rib and the water baffle hook 3.

[0038] The third turbulence rib 6 is fixed on the rear side surface of the lowest point in the middle of the concave part of the arc blade 1 and is located at the rear end of the water-blocking hook 3. The width of the third turbulence rib 6 is the same as the width of the first turbulence rib 4. The height of the third turbulence rib 6 is higher than the height of the first turbulence rib 4. The length of the third turbulence rib 6 is greater than the length of the first turbulence rib 4. The distance between adjacent ribs of the third turbulence rib 6 is 8 to 12 times the height of its rib.

[0039] The principle behind the third turbulence rib 6 is that this location is an area of ​​airflow accumulation, as well as a region where droplets or water vapor gather. However, localized flow blockage weakens convective heat transfer at this location. Setting up turbulence ribs here effectively improves the convective heat transfer effect, further reducing the airflow temperature and promoting the efficient precipitation of remaining water vapor into droplets. The reason why the height and length of the third turbulence rib 6 are greater than those of the first turbulence rib 4 is that this location is a weak flow region. Increasing the size of the turbulence element effectively maintains the enhancement of convective heat transfer without causing excessive local losses. The rib spacing of the third turbulence rib 4 is also designed to ensure that the longitudinal vortex attached to the wall maintains effective size and strength.

[0040] like Figure 1 , Figure 2 As shown, the secondary air intake unit comprises a secondary air intake duct 8 and a louver group 7. The secondary air intake duct 8 is fixed to the outside of the cooling tower side wall 9. The height of the secondary air intake duct 8 is slightly greater than the height of the arc-shaped blades 1, and the width of the secondary air intake duct 8 is approximately equal to the total width of the array of arc-shaped blades 1. The louver group 7 is located inside the secondary air intake duct 8. The airflow angle of the louvers in the louver group 7 is adjustable. When it is necessary to increase the secondary air intake flow rate, the airflow angle of the louvers can be decreased; when it is necessary to decrease the secondary air intake flow rate, the airflow angle of the louvers can be increased. The purpose is to adjust the flow ratio of the secondary dry and cold air and the saturated humid and hot air from the packing material. The heat transfer performance of the condensation and demisting device can be flexibly changed as needed, facilitating flexible adaptation to operating conditions and improving the environmental and seasonal adaptability of the cooling tower's demisting operation.

[0041] Traditional water collection and defogging devices only have the ability to intercept and collect inertial droplets in rising saturated humid air, but they lack heat exchange capabilities and cannot collect more water vapor from the humid air. This invention directly introduces dry, cool outside air into the main flow channel 10 of the cooling tower. The laterally flowing dry, cool air and the rising saturated humid air directly cross-flow and mix, enabling the defogging device to simultaneously perform heat exchange and reduce the temperature and humidity of the air inside the tower.

[0042] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A hybrid cross-flow enhanced condensation and mist elimination device, characterized in that: The application relates to a cooling tower, which comprises a blade unit for condensing water and a secondary air inlet unit, the blade unit is located in a main flow channel of the cooling tower, and the secondary air inlet unit is arranged on the outer side of the side wall of the cooling tower on both sides of the main flow channel. The blade unit is composed of a plurality of arc-shaped blades arranged in parallel at intervals, arc-shaped flow channels for the flow of hot and humid air are formed between the adjacent arc-shaped blades, the top surface of the convex part of the arc-shaped blade is provided with a water baffle hook facing the air inlet direction, and the surface of the arc-shaped blade is provided with turbulence ribs arranged in an array, the turbulence ribs are arranged at an angle of 30-60 DEG to the flow direction of the dry and cold air entering from the secondary air inlet unit. The secondary air inlet unit is provided with a secondary air inlet channel and an adjustable louver group, the secondary air inlet channel is fixed on the outer side of the side wall of the cooling tower, and the adjustable louver group is located in the secondary air inlet channel. The saturated hot and humid air generated from the filler of the cooling tower passes through the blade unit in the main flow channel from bottom to top, and the dry and cold air flowing transversely from the outside enters the main flow channel through the secondary air inlet unit and directly contacts and mixes with the rising hot and humid air.

2. The hybrid-crossflow enhanced condensing and mist elimination device of claim 1, wherein: The turbulence ribs comprise first turbulence ribs, second turbulence ribs and third turbulence ribs, the first turbulence ribs are fixed on the front end of the windward surface of the convex part of the arc-shaped blade, the second turbulence ribs are fixed on the windward surface of the convex part of the arc-shaped blade between the first turbulence ribs and the water baffle hook, and the third turbulence ribs are fixed on the surface of the concave part of the arc-shaped blade and located at the rear end of the water baffle hook.

3. The hybrid cross-flow enhanced condensing and mist elimination device of claim 2, wherein: The rib width, height and length of the first turbulence ribs are the same as the thickness of the base body of the arc-shaped blade, and the distance between the adjacent ribs of the first turbulence ribs is 8-12 times the height of the ribs.

4. The hybrid-crossflow enhanced condensing and mist elimination device of claim 2, wherein: The rib width of the second turbulence ribs is equal to the thickness of the base body of the arc-shaped blade, the rib length of the second turbulence ribs is the same as the length of the water baffle hook, the rib height of the second turbulence ribs is the same as the thickness of the base body of the arc-shaped blade but not higher than the height of the water baffle hook, and the distance between the adjacent ribs of the second turbulence ribs is 8-12 times the height of the ribs.

5. The hybrid cross-flow enhanced condensing and mist elimination device of claim 3, wherein: The width of the third turbulence ribs is the same as that of the first turbulence ribs, the height of the third turbulence ribs is higher than that of the first turbulence ribs, the length of the third turbulence ribs is greater than that of the first turbulence ribs, and the distance between the adjacent ribs of the third turbulence ribs is 8-12 times the height of the ribs.

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