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

Abstract

The invention 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

Technical Field

[0001] The present invention relates to the technical field of cooling tower demisting, and specifically to a demisting and water collection device for an energy-saving and environment-friendly cooling tower. Background Art

[0002] The condensation plume (fog) formed during the winter operation of the cooling tower settles on the production equipment and the roads around the cooling tower, causing problems such as icing and visual obstruction, seriously affecting production and road safety.

[0003] During the cooling process of the cooling tower in the industrial circulating water system, evaporation heat transfer dominates. Among the comprehensive water consumption of the cooling tower, evaporation accounts for about 70%, sewage discharge accounts for 15%, and drifting water accounts for 15%. How to reduce these evaporation fog and drifting water losses is an urgent problem.

[0004] The cooling tower demisting device aims to solve the winter fog problem of industrial cooling towers. A large amount of fog is generated during the operation of industrial cooling towers, resulting in water resource waste and abnormal humidity in the surrounding environment.

[0005] Currently, there are the following problems in cooling tower demisting:

[0006] 1. The cooling tower chimney is about 20 meters above the ground. In the winter when the fan is not operating, the fog is blown to one side when there is wind after leaving the chimney, so that the fog cannot reach the demister and is blown away.

[0007] 2. The air handling capacity of the demister is insufficient (the suction force is small).

[0008] 3. The total amount of fog on-site is greater than the original calculation. (Previously, the evaporation water volume and fog generation volume were measured to be about 15,000 m 3 / h. The air volume generated by the convection of cold and hot air in the cooling tower and the chimney effect was not calculated, which is about 45,000 m 3 / h, and the total fog volume to be treated is about 65,000 m 3 / h.

[0009] 4. Through on-site measurement, the water temperature leaving the tower is about 24 degrees, the temperature of the evaporation aerosol in the upper chimney of the tower is about 22 degrees, and the temperature on the chimney is about 14.6 degrees. At this time, the particle size of gaseous water molecules is small, the kinetic energy is large, and the escape is fast.

[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] (I) Technical Problems to be Solved

[0012] In view of the deficiencies of the prior art, the present invention provides a demisting and water collection device for an energy-saving and environment-friendly cooling tower, which solves the technical problem of poor demisting effect of the existing cooling tower.

[0013] (2) Technical solution

[0014] The present invention provides the following technical solution: A fog and water collection device for an energy-saving and environmental protection cooling tower, comprising a tower body and a fog and water collection device provided at the top of the tower body. Among them, the fog and water collection device includes a fog removal device and a water collection device. The fog removal device includes a wind barrel, a fan provided inside the wind barrel, and a frame provided outside the wind barrel. Casters are provided at the bottom of the frame, and the casters are arranged in a groove at the top of the tower body. A plurality of air inlets are provided on the outer side of the wind barrel, and air inlet pipes are provided on the air inlets. A detachable air disc is provided below the fan, and a plurality of wind shielding plates are provided on the side surfaces around the frame.

[0015] Preferably, a grid in the shape of a well is provided inside the air inlet, and a hinge door is provided outside. The air inlet pipe is provided on the lower side of the grid.

[0016] Preferably, an air inlet pipe joint is provided at the front end of the air inlet pipe. The air inlet pipe joint is in a T shape, with the front end extending into the wind barrel and the rear end connecting to the air inlet pipe.

[0017] Preferably, a lifting device is provided on the frame to drive the upper part of the frame to lift.

[0018] Preferably, the air disc is in a conical structure, and a number of air guiding vanes are provided inside it. A water collecting trough is provided at the bottom of the air disc. The side of the water collecting trough is connected to the water outlet pipe of the water collection device, and the bottom of the water outlet pipe extends into the water collection tank.

[0019] Preferably, the upper part of the frame is in a fence shape, and the wind shielding plates are arranged in the grids of the fence.

[0020] (3) Advantageous effects

[0021] Compared with the prior art, the present invention provides a fog and water collection device for an energy-saving and environmental protection cooling tower, having the following advantageous effects:

[0022] 1. For the fog and water collection device of this energy-saving and environmental protection cooling tower, by setting a frame outside the wind barrel and covering the wind barrel, it is used to intercept the fog and prevent the fog from being blown into the atmosphere. In addition, a plurality of casters are provided at the bottom of the frame, and the casters can move left and right in the groove, which is convenient for the maintenance of the cooling tower and the fog and water collection device; by setting a plurality of air inlets on the outer side of the wind barrel, the entry of outside cold air and the mixing with hot fog are increased, reducing the production of fog; an air inlet pipe is provided on each air inlet, and the cold air is sent from outside the tower to the central platform of the wind barrel. The cold air is directly sent into the hot and cold fog through the air inlet pipe, and the occurrence of fog is reduced through the condensation effect. The air inlets and air inlet pipes are used to supplement the air volume when the natural air intake is insufficient; by setting an air disc below the fan, the fog is further blocked, and the air disc is connected to the water collection device, which is convenient for the collection of fog; by setting a plurality of wind shielding plates on the side surfaces around the frame, the side wind is prevented from disturbing the fog removal process. Brief Description of the Drawings

[0023] Figure 1 Fig. 5 is a schematic perspective view of an embodiment of a mist elimination and water collection device for an energy-saving and environment-friendly cooling tower according to the present invention;

[0024] Figure 2 Fig. 6 is a schematic external structure view of the air duct of an embodiment of a mist elimination and water collection device for an energy-saving and environment-friendly cooling tower according to the present invention;

[0025] Figure 3 Fig. 7 is a schematic structural view of the air tray and the water collection device of an embodiment of a mist elimination and water collection device for an energy-saving and environment-friendly cooling tower according to the present invention.

[0026] In the figures: 1, tower body; 11, groove; 2, mist elimination device; 21, air duct; 211, air inlet; 212, grille; 213, hinge door; 214, air inlet pipe joint; 22, fan; 23, frame; 24, air tray; 241, water collection tank; 25, wind shield; 3, water collection device; 31, water outlet pipe; 32, water collection tank. Detailed Embodiment

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] As introduced in the background art, there are deficiencies in the prior art. To solve the above technical problems, the present application proposes a mist elimination and water collection device for an energy-saving and environment-friendly cooling tower.

[0029] Please refer to Figures 1-3 , a mist elimination and water collection device for an energy-saving and environment-friendly cooling tower, including a tower body 1 and a mist elimination and water collection device provided at the top of the tower body. The mist elimination and water collection device includes a mist elimination device 2 and a water collection device 3. The mist elimination device includes an air duct 21, a fan 22 provided inside the air duct, and a frame 23 provided outside the air duct. The bottom of the frame 23 is provided with casters (not shown in the figure), and the casters are provided in the groove 11 at the top of the tower body. A plurality of air inlets 211 are provided on the outer side of the air duct 21, an air inlet pipe is provided on the air inlets 211, a detachable air tray 24 is provided below the fan 22, the air tray 24 is connected to the water collection device 3, and a plurality of wind shields 25 are provided on the side surfaces around the frame 23.

[0030] A fog and water collection device for an energy-saving and environment-friendly cooling tower of the present invention mainly includes a tower body 1 and a fog and water collection device 2. The fog and water collection device 2 includes a wind barrel 21, a fan 22 and a frame 23. Among them, the wind barrel 21 is arranged directly above the water turbine of the cooling tower tower body 1. The fan 22 is installed inside the wind barrel 21. The fan 22 rotates at a high speed under the drive of the motor to intercept the fine water droplets in the fog 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 barrel 21 and covers the wind barrel 21 to intercept the fog and prevent the fog from being blown into the atmosphere. In addition, a plurality of casters are provided at the bottom of the frame 23, and the casters can move left and right in the groove 11, which is convenient for the maintenance of the cooling tower and the fog and water collection device. By arranging a plurality of air inlets 211 on the outer side of the wind barrel 21, the entry of outside cold air and the mixing with hot fog are increased, and the production of fog is reduced. An air inlet pipe is arranged on each air inlet 211, and the cold air is sent from outside the tower to the central platform of the wind barrel 21. The cold air is directly sent into the hot and cold fog through the air inlet pipe 212. The occurrence of fog is reduced through the condensation effect. The air inlets 211 and the air inlet pipes are used to supplement the air volume when the natural air intake is insufficient. By arranging a wind disk 24 below the fan 22, the fog is further blocked. The wind disk 24 is connected to the water collection device 3, which is convenient for the collection of fog. By arranging a plurality of wind shields 25 on the side surfaces around the frame 23, the side wind is prevented from disturbing the fog removal process.

[0031] The purpose of the fog and water collection device of the present application is to reduce the potential safety hazards caused by fog and recover the water resources lost due to fog drifting to the maximum extent. By condensing and replacing heat, the kinetic energy between gaseous water molecules is reduced, and the gaseous water molecules become liquid, reducing a certain amount of fog. The condensation effect can be quickly achieved by using the relatively low-temperature dry cold fog in the environment. By opening air inlet holes below the wind barrel 21, the accurate self-aspirated air volume cannot be measured. Therefore, an additional forced air intake system, that is, a plurality of air inlets 211, is added to be started in case the condensation effect is insufficient.

[0032] In a preferred embodiment, referring to Figure 1 and 2 , a cross-shaped grille 212 is arranged inside the air inlet 211 of the fog and water collection device of the energy-saving and environment-friendly cooling tower, and a hinge door 213 is arranged outside. The air inlet pipe is arranged on the lower side of the grille 212. The front end of the air inlet pipe is provided with an air inlet pipe joint 214. The air inlet pipe joint 214 is T-shaped, with the front end extending into the wind barrel 21 and the rear end connecting to the air inlet pipe. By arranging a hinge door 213 outside the air inlet 211, the hinge door 213 can be opened / closed according to the air intake volume, making it more flexible to use. The air inlet pipe joint 214 is snapped into the cross-shaped grille 212 and is externally connected to the air inlet pipe for increasing fog condensation. The low-temperature air in the environment is used to cool the hot and humid air in the wind barrel 21, reducing the kinetic energy between gaseous water molecules and increasing the particle size of the water droplets in the fog, thereby reducing the fog volume. By setting the air inlet pipe joint 214 as T-shaped, the air intake volume is ensured to be more uniform.

[0033] In a preferred embodiment, referring to Figure 1 The frame 23 of the demisting and water collecting device of the energy-saving and environmentally friendly cooling tower is provided with a lifting device to drive the upper portion of the frame 23 to rise and fall. The height of the frame 23 can be adjusted according to the needs of use. The lifting device adopts a traditional screw module to drive the lifting. 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 Figure 1 and Figure 3 The fan disc 24 of the demisting and water collecting device of this energy-saving and environmentally friendly cooling tower has a conical structure with several air guide vanes inside. A water collecting trough 241 is provided at the bottom of the fan disc 24. The side of the water collecting trough 241 is connected to the water outlet pipe 31 of the water collecting device 3, and the bottom of the water outlet pipe 31 extends into the water collecting tank 32. The fan disc 24 is set to an inverted cone shape to ensure that the mist absorbed by the fan 22 can be drained into the water collecting trough 241, discharged through the water outlet pipe 31, and collected in the water collecting tank 32. The water collecting tank 32 can be connected to the cooling water pipeline of the cooling tower, so that the water can enter the cooling tower for recycling, achieving energy-saving and environmental protection effects.

[0035] In a preferred embodiment, referring to Figure 1 The upper portion of the frame 23 of the demisting and water collecting device of the energy-saving and environmentally friendly cooling tower is a fence-shaped frame, and wind shields 25 are arranged within the grid of the fence. Several wind shields 25 are arranged within the grid of the frame 23. The upper wind shields 25 can block the mist blown out from the cooling tower, and the side wind shields 25 can block the side mist from being blown away.

[0036] The demisting and water collecting device for the energy-saving and environmentally friendly cooling tower of the present invention 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 mist. The process is to make the rising mist rub, collide, cut and converge in an approximately horizontal direction, turning the hot and humid mist into relatively dry air. At the same time, the heat energy is released, eliminating the fog diffusion phenomenon in the cooling tower in winter.

[0038] (2) The evaporation mist in the cooling tower is composed of air and fine water droplets. The average particle size of the water droplets is 10-50 microns. After friction, collision, cutting and aggregation by the demisting device, the fine water droplets become larger water droplets, realizing the recycling process of recovering the evaporated water. The water recovery rate is high, which greatly reduces the loss of floating water.

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

[0040] (4) It is composed of two platforms of the same size and has functions of parallel movement and lifting, which is convenient for the maintenance of the fan reducer in the air duct.

[0041] (5) During operation control, the yield can be adjusted according to the amount of fog, and there are multiple alarm functions.

[0042] (6) The equipment has a "three-proof" design. The waterproof design reaches the waterproof level of IP65 or above, including the waterproof design of plug and socket. The anti-freezing design introduces the return hot water into the demisting device and turns it on in extremely low-temperature climates to prevent the equipment from freezing. The anti-corrosion design. It adopts stainless steel and modified engineering plastics, with anti-oxidation and low-temperature corrosion resistance. The frame adopts aluminum alloy materials to achieve anti-corrosion and light weight.

[0043] (7) Module design. The demisting device is composed of multiple demisting units designed in a modular structure, which is convenient for installation.

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

[0045] Generally, the sum of the self-aspirated air volume and the evaporation volume of a cooling tower is about 3-5 times the cooling water volume, but this is only a rough empirical range. The estimated results through calculation are as follows:

[0046] Given that the circulating water volume is 3500 tons / h, that is, 3500 cubic meters / h, the evaporation volume calculated according to the inlet and outlet water temperature difference of 9 degrees is about 54.31 cubic meters / h.

[0047] Estimation of self-aspirated air volume:

[0048] Taking the middle value of 4 times for calculation, the sum of the self-aspirated air volume and the evaporation volume is about 3500×4 = 14000 cubic meters / h. Then the self-aspirated air volume is about 14000 - 54.31 = 13945.69 cubic meters / h.

[0049] The air volume of the air outlet duct is about the sum of the self-aspirated air volume and the evaporation volume, that is, about 14000 cubic meters / h.

[0050] The above is only based on a rough estimate, and this air volume refers to the air volume carried in the evaporation volume.

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

[0052] It varies due to various factors such as the type of cooling tower, the performance of the packing, the air temperature and humidity, the area of the air inlet, the height from the air inlet to the air outlet of the tower, and the atmospheric pressure.

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

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

[0055] Assume that the pressure of the discharged mixed gas is approximately the atmospheric pressure \(p = 101325\ Pa\). According to the ideal gas state equation \(V=\frac{nRT}{p}\), at the tower temperature of \(306.15\ K\), let the molar flow rate of the discharged water vapor be \(n_{v}\), then \(n_{v}=\frac{p_{v}G}{RT_{2}}\) (\(G\) is the air flow rate calculated previously).

[0056] Substituting the data, we get

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

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

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

[0060] Calculate the total amount of discharged gas

[0061] The total amount of discharged gas \(Q = G+V_{v}=17.9 + 0.047\approx17.947\ m^{3} / s\).

[0062] The total air volume is about \(65000\ m^{3} / h\).

[0063] The above calculations are simplified calculations under some assumptions and ideal conditions. Some of the given parameters are not accurate. For example, the given humidity should be \(65\%\). In actual situations, factors such as the internal structure of the cooling tower and the non-uniform mixing of water vapor also need to be considered.

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

Claims

1. A demisting and water collecting device for an energy-saving and environmental protection cooling tower, comprising a tower body and a demisting and water collecting device arranged 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 barrel, a fan arranged inside the wind barrel, and a frame arranged outside the wind barrel. Casters are arranged at the bottom of the frame, and the casters are arranged in a groove at the top of the tower body. A plurality of air inlets are arranged on the outer side of the wind barrel, and air inlet pipes are arranged on the air inlets. A detachable wind disk is arranged below the fan, and the wind disk is connected to the water collection device. A plurality of wind shields are arranged on the side surfaces around the frame.

2. The demisting and water collecting device of the energy-saving and environmental protection cooling tower according to claim 1, characterized in that, A grid-shaped grille is arranged inside the air inlet, and a hinge door is arranged outside. The air inlet pipe is arranged below the grille.

3. The demisting and water collection device of the energy-saving and environmental protection cooling tower according to claim 1, characterized in that, The front end of the air inlet pipe is provided with an air inlet pipe joint. The air inlet pipe joint is T-shaped, with the front end extending into the wind barrel and the rear end connecting the air inlet pipe.

4. The demisting and water collection device of the energy-saving and environmental protection cooling tower according to claim 1, characterized in that, A lifting device is arranged on the frame to drive the upper part of the frame to lift.

5. The demisting and water collection device of the energy-saving and environmental protection cooling tower according to claim 1, characterized in that, The wind disk is of a conical structure, and a number of air guiding vanes are arranged inside it. A water collection tank is arranged at the bottom of the wind disk, and the side of the water collection tank 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 demisting and water collection device of the energy-saving and environmental protection cooling tower according to claim 1, characterized in that, The upper part of the frame is of a fence type, and the wind shields are arranged in the grids of the fence.

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