Open type cooling tower evaporation water recovery device

Abstract

The utility model relates to an open type cooling tower evaporated water recovery device which is an inverted V-shaped water collector array arranged above a water tower supporting cross beam 7 in a cooling tower, wherein each inverted V-shaped water collector 4 in the array consists of a porous composite water collecting plate 4.1, a connecting plate 4.2, a water collecting plate fixing frame 4.3, a sealing side plate 4.5 and a dust shielding net 6. The porous composite water collecting plate 4.1 is made of a composite material and has excellent air permeability, adsorbability and water condensation performance, water vapor fog drops touch irregular hole nets of the porous composite water collecting plate 4.1 to be adhered down, after repeated adhesion, tiny fog drops are adhered and gathered to form liquid drops, water drops form raindrops and generate rainfall, and finally the raindrops fall into the cooling tower. The cooling tower evaporation water is timely recovered, and the cooling tower evaporation water vapor is eliminated. And complete replacement of the waveform dehydrator made of the PVC material and more efficient recovery of the evaporated water are realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of cooling tower recovery of evaporated water vapor, in particular to an open cooling tower evaporated water recovery device. Background Art

[0002] Open cooling towers are widely used in industries such as power, petroleum, chemicals, ceramics, and metallurgy. During operation, the circulating water within the cooling tower comes into direct contact with the air for heat and mass transfer, resulting in evaporation losses, windage losses, and wastewater losses, resulting in significant water waste. Evaporation losses from cooling towers account for 37-50% of total water consumption. Under certain climatic conditions, this evaporated water is cooled by the incoming cold air, forming a white mist that negatively impacts urban landscapes, road visibility, and causes icing on road surfaces. Furthermore, airborne particulate matter is easily absorbed by the white mist, exacerbating the effects of smog. Therefore, reducing evaporation losses and demisting to save water are crucial for cooling towers.

[0003] Due to evaporation losses in water towers, water resources are severely wasted, necessitating timely water replenishment, which in turn consumes electricity and generates carbon emissions. Furthermore, as water evaporates, residual chloride ions accumulate, leading to excessive discharge of concentrated water. The accumulated circulation of residual chloride ions is highly corrosive, causing corrosion, damage, and leakage in circulating pumps and heat exchangers. Plate heat exchangers, in particular, are currently mostly made of 304 stainless steel, which is extremely susceptible to chloride ion corrosion. This results in rapid equipment damage, extensive maintenance, closed-loop water contamination, and high operating costs. Cooling tower circulating water consumption has long been a pressing technical issue in the energy conservation field.

[0004] The consumption of circulating cooling water in cooling towers has always been a technical problem that needs to be solved in the field of energy conservation. The reason for the consumption of circulating cooling water in cooling towers is that the air outside the cooling tower has low humidity, and the water droplet content in the air is relatively low before entering the cooling tower from the bottom. After entering the cooling tower, during the operation of the cooling system, the air and the cooling water in the cooling tower are fully contacted and mixed in the tower. The moisture in the cold air reaches the saturation corresponding to the current temperature. The air entering the cooling tower becomes saturated hot and humid air. It is distributed in the upper space of the water distributor in the cooling tower. Under the action of the cooling tower exhaust fan, the saturated hot and humid air is discharged from the tower outlet. When it comes into contact with the relatively low temperature air outside the tower, the hot and humid air temperature gradually drops and gradually becomes supersaturated. It condenses into water mist and forms small water droplets. After the water vapor of the cooling water condenses with the condensed water mist, it will form large water droplets that mix with the hot and humid steam, leaving some of the hot and humid steam in the cooling tower to form condensate. Due to the upward flow of hot air and the suction of the exhaust fan, a large part of the cooling water vapor is discharged outside the cooling tower, mixed with the air to form white mist and dissipated in the air, resulting in cooling water loss. In the past, water was widely used in industrial circulating cooling systems due to its high specific heat capacity, relative abundance, and affordability. However, with the advancement and development of society, the increasing use of water in industry has severely damaged precious water resources and the environment. Reducing industrial water consumption, especially the high volume of cooling water, has become particularly important. In open-loop water-cooling tower systems, cooling water consumption is primarily concentrated at the top of the cooling tower, where it is discharged as mist and droplets, resulting in significant cooling water loss.

[0005] Chinese patent CN102878857A discloses a cooling tower with a metal grid. This grid is installed at the ventilation outlet, allowing the mist from the impellers to condense on the grid and flow back to recover the condensate. However, using a single layer of metal grid for condensation suffers from poor flocculation, resulting in poor condensation efficiency, a small exhaust cross-section, low heat exchange efficiency, and increased fan load.

[0006] Chinese patent CN204854457U discloses a system consisting of multiple metal wire mesh modules stacked in a stepped configuration, connected by brackets to form a circular tower. When tiny liquids and mist droplets entrained in the vapor phase pass through the metal wire mesh modules, the tiny water vapor droplets collide with the wire mesh, collect, and flow back, achieving condensate recovery. However, while using multiple layers of metal mesh to condense water and install it at the outlet of the circular wind duct of the water tower offers good initial condensation results, it can also lead to blockage due to hard water, excessive fan pressure, and further overload of the fan due to the recovered evaporated water rain curtain and anti-clogging spray water.

[0007] Chinese patent CN211635849U discloses a novel flat-plate demister, comprising corrugated blades and connecting plates. Activated carbon blocks at the rear end of the fixed plate further absorb mist droplets from the demister's exhaust air. The adsorption effect of the activated carbon blocks significantly enhances the demister's demisting and water absorption capabilities. However, the fixed curved plate only significantly reduces windage loss, but has no effect on evaporation loss. Relying solely on the activated carbon blocks to absorb evaporated water can lead to rapid failure and frequent replacement of the activated carbon blocks. Furthermore, the activated carbon blocks reduce the exhaust cross-section, increasing fan load and power consumption. Summary of the Invention

[0008] To address some of the shortcomings of existing cooling tower evaporated water recovery technology, the present invention proposes an open cooling tower evaporated water recovery device. This device comprises an array of ∧-shaped water collectors positioned above the water tower support beams within the cooling tower. Each ∧-shaped water collector in the array consists of a porous composite water collector plate, a connecting plate, a water collector plate mounting bracket, a sealing side panel, and a dust screen. The porous composite water collector plate is made of a composite material with excellent air permeability, adsorption, and water condensation properties. Water vapor droplets adhere to the irregular pores of the porous composite water collector plate. After repeated adhesion, the tiny droplets adhere and aggregate, forming droplets. The water droplets then form raindrops, resulting in rainfall, which ultimately falls into the cooling tower. This ensures the timely recovery of evaporated water from the cooling tower and eliminates evaporative water vapor from the cooling tower. This device completely replaces PVC corrugated water eliminators, resolving the current inability of corrugated water eliminators to recover evaporated water.

[0009] The utility model discloses an open cooling tower evaporation water recovery device, which is composed of a plurality of ∧-shaped water collectors (4) arranged in an array and arranged on a water tower support beam (7) inside the cooling tower.

[0010] The ∧-shaped water collector (4) is composed of a porous composite water collecting plate (4.1), a connecting plate (4.2), a water collecting plate fixing frame (4.3), a sealing side plate (4.5) and a dust shielding net (6).

[0011] The porous composite water-receiving plate (4.1) is rectangular, with connecting plates (4.2) fixed to its two long sides. The plane of the porous composite water-receiving plate (4.1) and the vertical surface of the connecting plate (4.2) form a certain angle. The long sides of two porous composite water-receiving plates (4.1) are spliced ​​to form an isosceles ∧ shape at a certain angle, and the connecting plate (4.2) at the top of the ∧ shape is used to connect and fix the plate.

[0012] The connecting plates (4.2) of the two bottom edges of the isosceles ∧-shaped structure are connected and fixed using the water collecting plate fixing frame (4.3), and the connecting plates (4.2) of the two bottom edges are respectively connected and fixed to the sealing side plates (4.5) on both sides as a whole;

[0013] Sealing side panels (4.5) are provided around two porous composite water-receiving plates (4.1) connected in a ∧ shape, and the sealing side panels (4.5) at the four peripheries are connected and fixed to each other; a dust shielding net (6) is provided at the top of the sealing side panels (4.5).

[0014] The integrated ∧-shaped water collectors (4) are placed on the water tower support beams (7) arranged vertically and horizontally, and a matrix consisting of a plurality of vertically and horizontally arranged ∧-shaped water collectors (4) covers the top of the water tower support beams (7) in the horizontal direction.

[0015] Frames (4.4) are provided on the four sides of the porous composite water-receiving plate (4.1).

[0016] A plurality of fixing holes are provided on the connecting plate (4.2).

[0017] Compared with the existing cooling tower evaporation water recovery technology, the beneficial effects of this utility model are:

[0018] The ∧-shaped water collector design increases the exhaust cross-sectional area, resulting in a large amount of evaporated water recovery and high recovery efficiency;

[0019] Reduce sewage discharge, have good water mist removal effect, save energy and protect the environment;

[0020] Stable working performance and low operating cost;

[0021] Anti-corrosion, cold-resistant, high-temperature resistant, aging-resistant, and long service life;

[0022] Modular construction makes installation, inspection and maintenance easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0024] Figure 1 This is a schematic diagram of the internal structure of the utility model when applied to a cooling tower;

[0025] Figure 2 This is a top view of the array of ∧-shaped water collectors arranged in the tower of the utility model;

[0026] Figure 3 This is a structural diagram of the ∧-type water collector of the utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the porous composite water-receiving plate of the utility model;

[0028] Figure 5 It is a schematic diagram of the utility model in which the porous composite water-receiving plate and the connecting plate are connected at a certain angle.

[0029] Legend: 1. Fan, 2. Motor, 3. Reducer, 4. ∧-type water collector, 4.1. Multi-porous composite water collecting plate, 4.2. Connecting plate, 4.3. Water collecting plate fixing bracket, 4.4. Frame, 4.5. Sealing side panel, 4.6. Fixing hole, 5. Fan support column, 6. Dust shield, 7. Water tower support beam, 8. Water tower water distribution system, 9. Tower body. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] like Figure 1 As shown in Figure 2, the utility model discloses an open cooling tower evaporated water recovery device comprising an array of ∧-shaped water collectors 4 arranged above the water tower support beam 7 inside the cooling tower. Each ∧-shaped water collector 4 in the array is composed of a porous composite water collecting plate 4.1, a connecting plate 4.2, a water collecting plate fixing frame 4.3, a sealing side plate 4.5, and a dust screen 6. The porous composite water collecting plate 4.1 is made of a composite material with excellent air permeability, adsorption, and water condensation properties. Water vapor droplets adhere to the irregular pores of the porous composite water collecting plate 4.1. After repeated adhesion, the tiny droplets adhere and aggregate to form droplets. The water droplets then form raindrops, resulting in rainfall, which ultimately falls into the cooling tower. This ensures the timely recovery of evaporated water from the cooling tower and eliminates evaporated water vapor from the cooling tower. This completely replaces PVC corrugated water eliminators and achieves more efficient recovery of evaporated water.

[0032] like Figure 2 As shown in Figures 3, 4, and 5, the porous composite water-receiving plate 4.1 is rectangular, and its four sides are wrapped with a frame 4.4. Connecting plates 4.2 are fixed on its two long sides and fixed by welding or fasteners. There is a certain angle between the plane of the porous composite water-receiving plate 4.1 and the vertical surface of the connecting plate 4.2. The long sides of the two porous composite water-receiving plates 4.1 are spliced ​​into an isosceles ∧ shape at a certain angle, and the connecting plate 4.2 at the top of the ∧ shape is bolted and fixed. The isosceles ∧-shaped water-receiving plate shape can increase the exhaust cross-sectional area, cut the airflow, increase the contact between the cold air and the water vapor, improve the heat exchange rate, and effectively intercept saturated water vapor. The porous composite water-receiving plate 4.1 is made of porous foam ceramic breathable metal composite material, and can also be made of multi-layer stainless steel wire mesh by pressing. The volume density of the porous foam ceramic breathable metal composite material is 0.15-2g / cm³, and the specific surface area is 7.8×10 2-1.5×10 8 m 2 / m 3 The thickness is 10-60 mm, and the number of holes per inch (PPI) of the porous foam ceramic breathable metal composite material is 50-90.

[0033] The connecting plate 4.2, the water collecting plate fixing frame 4.3 and the frame 4.4 are preferably made of stainless steel.

[0034] The connecting plates 4.2 at the two bottom corners of the ∧-shaped structure are fixed by welding to the water collecting plate fixing frame 4.3 to increase stability and integrity. The porous composite water collecting plate 4.1 is bolted to the sealing side plates 4.5 on both sides using the connecting plates 4.2 at the two bottom corners.

[0035] like Figure 1 As shown in FIG2 , sealing side panels 4.5 are provided around two porous composite water collecting plates 4.1 connected in a ∧ shape. The sealing side panels (4.5) are connected and fixed to each other using fasteners. A dust screen 6 is provided at the top of the sealing side panels 4.5 to prevent debris and dust from entering the water collector and affecting its operating efficiency.

[0036] The integrated ∧-shaped water collectors 4 are placed on the water tower support beams 7 arranged vertically and horizontally at the corresponding positions. An array composed of several vertically and horizontally arranged ∧-shaped water collectors 4 covers the top of the water tower support beams 7 in the horizontal direction, forming an integral water collection layer in the cooling tower.

[0037] Furthermore, according to actual needs, the porous composite water-receiving plate 4.1 can also be designed into other shapes besides the ∧ shape, such as a straight shape, an arc shape, etc.

[0038] The inventors have verified the effectiveness of this utility model in experiments conducted at an ambient temperature of 45°C, a humidity of 19.8% RH, and a dew point of 13.7°C. The results demonstrate a high evaporation water recovery efficiency of 40-55%, a residual droplet content of ≤5 mg / Nm³ (dry basis), and a residual droplet size of ≤5 µm at the water tower outlet. This achieves high evaporation efficiency, effective water mist removal, and reduced wastewater discharge. Furthermore, the device exhibits stable operating performance, corrosion resistance, aging resistance, cold resistance, high temperature resistance, bending resistance, lightweight, low operating costs, energy conservation, environmental protection, and a long service life.

[0039] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An open cooling tower evaporation water recovery device, characterized in that: The evaporated water recovery device is composed of a plurality of ∧-shaped water collectors (4) arranged in an array and arranged on a water tower support beam (7) inside a cooling tower; The ∧-shaped water collector (4) is composed of a porous composite water collecting plate (4.1), a connecting plate (4.2), a water collecting plate fixing frame (4.3), a sealing side plate (4.5) and a dust shielding net (6); The porous composite water-receiving plate (4.1) is rectangular, with connecting plates (4.2) fixed to its two long sides. The plane of the porous composite water-receiving plate (4.1) and the vertical surface of the connecting plate (4.2) form a certain angle. The long sides of two porous composite water-receiving plates (4.1) are spliced ​​to form an isosceles ∧ shape at a certain angle, and the connecting plate (4.2) at the top of the ∧ shape is used to connect and fix the plate. The connecting plates (4.2) of the two bottom edges of the isosceles ∧-shaped structure are connected and fixed using the water collecting plate fixing frame (4.3), and the connecting plates (4.2) of the two bottom edges are respectively connected and fixed to the sealing side plates (4.5) on both sides as a whole; Sealing side panels (4.5) are provided around two porous composite water-receiving plates (4.1) connected in a ∧ shape, and the sealing side panels (4.5) at the four peripheries are connected and fixed to each other; a dust shielding net (6) is provided at the top of the sealing side panels (4.5); The integrated ∧-shaped water collectors (4) are placed on the water tower support beams (7) arranged vertically and horizontally, and a matrix consisting of a plurality of vertically and horizontally arranged ∧-shaped water collectors (4) covers the top of the water tower support beams (7) in the horizontal direction.

2. The open cooling tower evaporated water recovery device according to claim 1, characterized in that: Frames (4.4) are provided on the four sides of the porous composite water-receiving plate (4.1).

3. The open cooling tower evaporated water recovery device according to claim 1, characterized in that: A plurality of fixing holes are provided on the connecting plate (4.2).

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