Demisting and water collecting device of energy-saving and environment-friendly cooling tower

Abstract

The utility model relates to the technical field of cooling tower demisting, in particular to a demisting and water collecting device of an energy-saving and environment-friendly cooling tower, which comprises a tower body and a demisting and water collecting device, the demisting and water collecting device comprises a demisting device and a water collecting device, the demisting device comprises an air duct, a fan and a frame, trundles are arranged at the bottom of the frame, the trundles are arranged in a groove at the top of the tower body, and the water collecting device is arranged in the groove. A plurality of air inlets are formed in the outer side of the air cylinder, air inlet pipes are arranged on the air inlets, a detachable air disc is arranged below the fan and connected with a water collecting device, and a plurality of air shielding plates are arranged on the side faces of the periphery of the frame. According to the demisting and water collecting device, a plurality of air inlets are formed in the outer side of the air duct, so that outside cold air entering is increased to be mixed with hot mist, and mist production is reduced; each air inlet is provided with an air inlet pipe, air is supplied to the central platform of the air duct from the outside of the tower, cold air is directly supplied into cold and hot mist through air inlet pipe pipelines, the mist is reduced through the condensation effect, and the air inlets and the air inlet pipes are used for supplementing air quantity when natural air inlet is insufficient.

Description

A demisting and water collection device for an energy-saving and environmentally friendly cooling tower Technical Field

[0001] This utility model relates to the field of cooling tower demisting technology, specifically a demisting and water collection device for energy-saving and environmentally friendly cooling towers. Background Technology

[0002] The condensate plumes (mist) generated during the winter operation of cooling towers settle on production facilities and roads around the cooling towers, causing problems such as icing and visual obstruction, which seriously affect production and road safety.

[0003] In the cooling process of industrial circulating water cooling towers, evaporation heat exchange is dominant. Of the total water consumption of cooling towers, evaporation accounts for about 70%, wastewater discharge accounts for 15%, and drift water accounts for 15%. How to reduce these losses from evaporation mist and drift water is an urgent problem.

[0004] Cooling tower demisting devices are designed to solve the problem of fogging in industrial cooling towers during winter. Industrial cooling towers generate a large amount of fog during operation, leading to water waste and abnormal humidity in the surrounding environment.

[0005] Currently, cooling tower demisting has the following problems:

[0006] 1. The cooling tower duct is about 20 meters above the ground. In winter, when the fan is not turned on, the mist is blown to one side when there is wind, so that the mist cannot reach the demister and be blown away.

[0007] 2. Insufficient air handling capacity of the demister (weak suction).

[0008] 3. The total amount of fog on site is greater than originally calculated (previously, the evaporation water volume and fog generation volume were estimated to be approximately 15,000 m³). 3 / h. The convection of hot and cold air in the cooling tower was not calculated; the air volume generated by the chimney effect is approximately 45,000 m³. 3 / h, the total amount of fog that needs to be processed is approximately 65,000 m³. 3 / h.

[0009] 4. On-site measurements showed that the tower water temperature was approximately 24 degrees Celsius, the temperature of the evaporating mist inside the tower's ventilation duct was approximately 22 degrees Celsius, and the temperature on the ventilation duct was approximately 14.6 degrees Celsius. At this temperature, the gaseous water molecules have small particle sizes, high kinetic energy, and escape quickly.

[0010] Therefore, there is an urgent need for a new type of cooling tower demisting and water collection device to solve the above problems. Summary of the Invention

[0011] (a) Technical problems to be solved

[0012] To address the shortcomings of existing technologies, this utility model provides an energy-saving and environmentally friendly demisting and water collection device for cooling towers, solving the technical problem of poor demisting effect in existing cooling towers.

[0013] (II) Technical Solution

[0014] This utility model provides the following technical solution: a demisting and water collection device for an energy-saving and environmentally friendly cooling tower, comprising a tower body and a demisting and water collection device disposed on the top of the tower body, wherein the demisting and water collection device includes a demisting device and a water collection device, the demisting device includes a wind duct, a fan disposed inside the wind duct and a frame disposed outside the wind duct, the bottom of the frame is provided with casters, the casters are disposed in a groove on the top of the tower body, the outer side of the wind duct is provided with multiple air inlets, the air inlets are provided with air inlet pipes, a detachable fan plate is provided below the fan, and multiple wind shields are provided on the sides around the frame.

[0015] Preferably, the air inlet has a grid-shaped grille inside and a hinged door on the outside, and the air inlet pipe is located on the lower side of the grille.

[0016] Preferably, the front end of the air inlet pipe is provided with an air inlet pipe connector, which is T-shaped, with the front end extending into the air duct and the rear end connected to the air inlet pipe.

[0017] Preferably, the frame is equipped with a lifting device to drive the upper part of the frame to rise and fall.

[0018] Preferably, the fan is a conical structure with several air guide vanes inside. The bottom of the fan is provided with a water collection trough, and the side of the water collection trough is connected to the water outlet pipe of the water collection device. The bottom of the water outlet pipe extends into the water collection tank.

[0019] Preferably, the upper part of the frame is a fence type, and the windproof plate is located within the grid of the fence.

[0020] (III) Beneficial Effects

[0021] Compared with the prior art, this utility model provides an energy-saving and environmentally friendly demisting and water collection device for cooling towers, which has the following beneficial effects:

[0022] 1. The demisting and water collection device of this energy-saving and environmentally friendly cooling tower uses a frame installed outside the air duct to intercept mist and prevent it from being blown into the atmosphere. The frame has multiple casters at the bottom, which can move left and right within grooves for easy maintenance of the cooling tower and the demisting and water collection device. Multiple air inlets on the outside of the air duct increase the mixing of cold air and hot mist, reducing mist formation. Each air inlet has an air inlet pipe that delivers air from outside the tower to the central platform of the air duct, directly introducing cold air into the hot and cold mist through the pipes. The condensation effect reduces mist formation. The air inlets and pipes supplement the airflow when natural air intake is insufficient. A fan disc is installed below the fan to further block mist; the fan disc is connected to the water collection device for easy mist collection. Multiple wind shields are installed on the sides of the frame to prevent crosswinds from disrupting the demisting process. Attached Figure Description

[0023] Figure 1 is a three-dimensional structural schematic diagram of an embodiment of the demisting and water collection device for an energy-saving and environmentally friendly cooling tower according to this utility model;

[0024] Figure 2 is a schematic diagram of the external structure of the duct of an embodiment of the demisting and water collection device for an energy-saving and environmentally friendly cooling tower of this utility model.

[0025] Figure 3 is a schematic diagram of the structure of the fan and water collection device of an embodiment of an energy-saving and environmentally friendly cooling tower demisting and water collection device of this utility model.

[0026] In the diagram: 1. Tower body; 11. Groove; 2. Demisting device; 21. Air duct; 211. Air inlet; 212. Grille; 213. Hinge door; 214. Air inlet pipe connector; 22. Fan; 23. Frame; 24. Fan coil; 241. Water collection trough; 25. Wind shield; 3. Water collection device; 31. Water outlet pipe; 32. Water collection tank. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a demisting and water collection device for an energy-saving and environmentally friendly cooling tower.

[0029] Please refer to Figures 1-3. A demisting and water collection device for an energy-saving and environmentally friendly cooling tower includes a tower body 1 and a demisting and water collection device located at the top of the tower body. The demisting and water collection device includes a demisting device 2 and a water collection device 3. The demisting device includes a wind duct 21, a fan 22 located inside the wind duct, and a frame 23 located outside the wind duct. The bottom of the frame 23 is provided with casters (not shown in the figure), which are located in a groove 11 at the top of the tower body. Multiple air inlets 211 are provided on the outside of the wind duct 21, and air inlets are provided on the air inlets 211. A detachable fan plate 24 is provided below the fan 22, and the fan plate 24 is connected to the water collection device 3. Multiple wind shields 25 are provided on the sides of the frame 23.

[0030] This utility model discloses an energy-saving and environmentally friendly cooling tower demisting and water collection device, mainly comprising a tower body 1 and a demisting and water collection device 2. The demisting and water collection device 2 includes a wind tunnel 21, a fan 22, and a frame 23. The wind tunnel 21 is located directly above the water turbine of the cooling tower body 1. The fan 22 is installed inside the wind tunnel 21 and rotates at high speed under the drive of a motor, intercepting fine mist droplets in the mist generated by the cooling tower. The collected water enters the water collection device under the action of centrifugal force. The frame 23 is installed outside the wind tunnel 21 and covers the wind tunnel 21 to intercept the mist and prevent it from being blown into the atmosphere. In addition, the bottom of the frame 23 is equipped with multiple casters that can move left and right within the groove 11 for easy adjustment of the cooling tower. The tower and defogging and water collection device are inspected and repaired. Multiple air inlets 211 are installed on the outside of the air duct 21 to increase the entry of cold air and mix with hot fog, thereby reducing fog production. Each air inlet 211 is equipped with an air inlet pipe, which sends air from outside the tower to the central platform of the air duct 21. The cold air is directly sent into the hot and cold fog through the air inlet pipe 212, and the fog generation is reduced by the condensation effect. The air inlets 211 and air inlet pipes are used to supplement the air volume when the natural air intake is insufficient. A fan plate 24 is installed below the fan 22 to further block the fog. The fan plate 24 is connected to the water collection device 3 to facilitate the collection of fog. Multiple wind shields 25 are installed on the sides of the frame 23 to prevent crosswinds from disturbing the defogging process.

[0031] The purpose of the defogging and water collection device in this application is to reduce safety hazards caused by fog and to maximize the recovery of water resources lost due to fog. By condensing and displacing heat, the kinetic energy between gaseous water molecules is reduced, causing the gaseous water molecules to become liquid, thereby reducing a certain amount of fog. The device can quickly achieve the condensation effect by utilizing the relatively dry and cold environment. Since it is impossible to accurately measure the self-suction air volume by opening an air inlet at the bottom of the air duct 21, an additional forced air intake system, i.e., multiple air inlets 211, is added in case the condensation effect is insufficient.

[0032] In a preferred embodiment, referring to Figures 1 and 2, the air inlet 211 of the demisting and water collection device of the energy-saving and environmentally friendly cooling tower has a grid-shaped grille 212 inside and a hinged door 213 on the outside. The air inlet pipe is located below the grille 212. The front end of the air inlet pipe has an air inlet pipe connector 214, which is T-shaped, with its front end extending into the air duct 21 and its rear end connected to the air inlet pipe. By setting the hinged door 213 on the outside of the air inlet 211, the hinged door 213 can be opened / closed according to the air volume, making it more flexible to use. The air inlet pipe connector 214 is inserted into the grid-shaped grille 212 and connected to the external air inlet pipe to increase mist condensation. It uses the low temperature of the ambient air to cool the humid and hot air inside the air duct 21, reducing the kinetic energy between gaseous water molecules, increasing the droplet size in the mist, and reducing the amount of mist. By setting the air inlet pipe connector 214 to be T-shaped, a more uniform air volume is ensured.

[0033] In a preferred embodiment, referring to FIG1, a lifting device is provided on the frame 23 of the demisting and water collection device of the energy-saving and environmentally friendly cooling tower, which drives the upper part of the frame 23 to rise and fall. The height of the frame 23 can be adjusted according to the usage needs. The lifting device is a traditional screw module driven lifting method. Therefore, the specific structure of the lifting device is not further described in this application, but it does not affect the implementation of the patented technology.

[0034] In a preferred embodiment, referring to Figures 1 and 3, the fan plate 24 of the demisting and water collection device of the energy-saving and environmentally friendly cooling tower has a conical structure with several guide vanes inside. A water collection trough 241 is located at the bottom of the fan plate 24, and the side of the water collection trough 241 is connected to the outlet pipe 31 of the water collection device 3. The bottom of the outlet pipe 31 extends into the water collection tank 32. By setting the fan plate 24 to an inverted conical shape, the mist absorbed by the fan 22 can be guided into the water collection trough 241 and discharged through the outlet pipe 31, then collected in the water collection tank 32. The water collection tank 32 can be connected to the cooling water pipes of the cooling tower, allowing water to enter the cooling tower for recycling, achieving energy-saving and environmentally friendly effects.

[0035] In a preferred embodiment, referring to FIG1, the upper part of the frame 23 of the demisting and water collection device of the energy-saving and environmentally friendly cooling tower is a fence type, and the wind shield 25 is disposed within the grid of the fence. Several wind shields 25 are disposed within the grid of the frame 23. The wind shields 25 at the top can block the mist blown out from the cooling tower, and the wind shields 25 on the sides can prevent the mist on the sides from being blown away.

[0036] The demisting and water collection device for the energy-saving and environmentally friendly cooling tower of this utility model also has the following characteristics:

[0037] (1) The damping method is used to release the kinetic energy and thermal energy of water droplets in the fog. The process involves friction, collision, cutting and collection of the rising fog in an approximately horizontal direction, turning the hot and humid fog into drier air. At the same time, the thermal energy is released, eliminating the fog diffusion phenomenon in the cooling tower during winter.

[0038] (2) The evaporation mist in the cooling tower is composed of air and fine water droplets with an average droplet diameter of 10-50 micrometers. After passing through the friction, collision, cutting and collection of the demisting device, the fine water droplets become larger water droplets, realizing the recycling process of the evaporated water. The water recovery rate is high, which greatly reduces the loss of drift water.

[0039] (3) An anti-freezing device was added to eliminate the possibility of freezing of the water collection pipes during winter.

[0040] (4) It consists of two platforms of the same size and has parallel movement and lifting functions, which facilitates the maintenance of the fan reducer inside the air duct.

[0041] (5) The yield can be adjusted according to the amount of mist during operation control, and multiple alarm functions are provided.

[0042] (6) Equipment "Three-proof" design. Waterproof design reaches IP65 or higher waterproof rating, including waterproof design of plugs and sockets. Anti-freeze design: return hot water is introduced into the defogging device, which can be activated in extreme low-temperature climates to prevent the equipment from freezing. Corrosion-resistant design: stainless steel and modified engineering plastics are used, which are oxidation-resistant and low-temperature corrosion-resistant. The frame is made of aluminum alloy material to achieve corrosion resistance and lightweight.

[0043] (7) Modular design. The defogging device is composed of multiple defogging units with a modular structure design, which makes installation convenient.

[0044] (8) Control System. The main tasks of the control system of the demisting device are motor speed control, fault display, and PLC / DCS monitoring.

[0045] Typically, the sum of the self-drawn air volume and the evaporation air volume of a cooling tower is about 3-5 times the cooling water volume. However, this is only a rough estimate. The calculation results are as follows:

[0046] Given that the circulating water volume is 3500 tons / h, or 3500 cubic meters / h, and based on the 9-degree temperature difference between the inlet and outlet water, the evaporation water volume is approximately 54.31 cubic meters / h.

[0047] Self-priming air volume estimation:

[0048] Taking the median value as 4 times, the sum of the self-absorbed air volume and the evaporation air volume is approximately 3500 × 4 = 14000 cubic meters / h. Therefore, the self-absorbed air volume is approximately 14000 - 54.31 = 13945.69 cubic meters / h.

[0049] The air volume of the exhaust duct is approximately the sum of the self-drawn air volume and the evaporation air volume, which is about 14,000 cubic meters per hour.

[0050] The above is only a rough estimate. The air volume refers to the amount of air carried in the evaporation volume.

[0051] Actual total air volume of the exhaust duct:

[0052] The differences between cooling towers are due to various factors such as the type of cooling tower, the performance of the packing material, the air temperature and humidity, the air inlet area, the height from the air inlet to the air outlet, and the atmospheric pressure.

[0053] According to the saturated vapor pressure formula p_{s}=Ae^{-B}{T+C}} (for water, A=610.78Pa, B=17.27, C=237.3^{C}), at a water temperature of 33^{C}, the saturated vapor pressure p_{s}=610.78e^{-17.27}{33+237.3}}\approx5032.1Pa.

[0054] According to the humidity formula varphi=\frac{p_{v}}{p_{s}} (where varphi is relative humidity and p_{v} is the actual water vapor partial pressure), given that varphi=0.55, the actual water vapor partial pressure p_{v}=0.55\times5032.1=2767.7Pa.

[0055] Assuming the pressure of the discharged mixed gas is approximately atmospheric pressure p = 101325 Pa, according to the ideal gas law V = nRT p, at a temperature of 306.15 K inside the tower, let the molar flow rate of the discharged water vapor be n_{v}, then n_{v} = p_{v}G}{RT_{2} (G is the air flow rate calculated earlier).

[0056] Substituting the data, we can obtain

[0057] n_{v}=\frac{2767.7\times17.9}{8.314\times306.15}\approx1.9mol / s.

[0058] According to the ideal gas law, water vapor flow rate

[0059] V_{v}=\frac{n_{v}RT_{2}}{p}\approx\frac{1.9\times8.314\times306.15}{101325}\approx0.047m^{3} / s.

[0060] Calculate the total amount of exhaust gas

[0061] The total amount of gas discharged, Q = G + V_{v} = 17.9 + 0.047 approx. 17.947 m^{3} / s.

[0062] The total air volume is approximately 65,000 m³ / h.

[0063] The above calculations are simplified calculations based on some assumptions and ideal conditions. Some given parameters are not precise, such as the humidity being given as 65%. In actual situations, the influence of factors such as the internal structure of the cooling tower and the uneven mixing of water vapor also needs to be considered.

[0064] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A demisting and water collection device for an energy-saving and environmentally friendly cooling tower, comprising a tower body and a demisting and water collection device disposed at the top of the tower body, characterized in that, The demisting and water collection device includes a demisting device and a water collection device. The demisting device includes a wind duct, a fan inside the wind duct, and a frame outside the wind duct. The bottom of the frame is equipped with casters, which are located in a groove at the top of the tower. The outside of the wind duct is equipped with multiple air inlets, and each air inlet is equipped with an air inlet pipe. A detachable fan plate is located below the fan and is connected to the water collection device. Multiple wind shields are provided on the sides of the frame.

2. The energy-saving and environment-friendly demisting and water collecting device of a cooling tower according to claim 1, characterized in that, The air inlet has a grid-shaped grille inside and a hinged door on the outside, with the air inlet pipe located below the grille.

3. The energy-saving and environment-friendly demisting and water collecting device of a cooling tower according to claim 1, characterized in that, The front end of the air inlet pipe is provided with an air inlet pipe connector, which is T-shaped, with the front end extending into the air duct and the rear end connected to the air inlet pipe.

4. The demisting and water collection device for the energy-saving and environmentally friendly cooling tower according to claim 1, characterized in that, The frame is equipped with a lifting device that drives the upper part of the frame to rise and fall.

5. The demisting and water collection device for the energy-saving and environmentally friendly cooling tower according to claim 1, characterized in that, The fan is a conical structure with several air guide vanes inside. The bottom of the fan is equipped with a water collection trough, and the side of the water collection trough is connected to the water outlet pipe of the water collection device. The bottom of the water outlet pipe extends into the water collection tank.

6. The energy saving and environment friendly demisting and water collecting device of cooling tower as claimed in claim 1 wherein, The upper part of the frame is fence-shaped, and the windproof plate is located within the grid of the fence.

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