Water recovery system of mechanical draft cooling tower

Abstract

The utility model relates to the technical field of water recovery of cooling towers, in particular to a water recovery system of a mechanical draft cooling tower, which comprises an expanded connection air duct arranged at an air outlet of the mechanical draft cooling tower and communicated with the air outlet, a water condensation structure is axially arranged in the expanded connection air duct, and a sound wave generator corresponding to the water condensation structure is arranged on the inner circumferential wall of the expanded connection air duct. The water condensation structure comprises a plurality of longitudinally-arranged partition plates, and the sound production direction of the sound wave generator intersects with the partition plates. Sound waves generated by the sound wave generator interact with hot and humid air in the expanded air duct, the molecular motion state of water vapor carried in the hot and humid air is changed under the action of the sound waves, the water vapor condensation process is accelerated, and the longitudinally-arranged partition plates are matched with the sound wave generator to further promote the condensation effect. Water drops condensed under the action of sound waves are attached to the partition plate and slide down along the surface of the partition plate to be recycled, so that the amount of water vapor discharged out of the tower along with hot air is reduced, the water evaporation loss of the cooling tower is remarkably reduced, and the utilization rate of water resources is effectively increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to cooling tower water recovery technology field, specifically, relate to a kind of mechanical ventilation cooling tower water recovery system. BACKGROUND

[0002] In industrial production, many processes will generate a large amount of heat, in order to ensure the normal operation of equipment and the stable process, the need to effectively dissipate these heat. Mechanical ventilation cooling tower as a kind of commonly used cooling equipment, through the mechanical ventilation, air and cooling water in the tower heat exchange, so as to reduce the temperature of cooling water, realize heat transfer and dissipation.

[0003] Mechanical ventilation cooling tower has a wide range of applications in many industrial fields. In the power industry, mainly used in thermal power plant steam turbine cooling, cooling turbine exhaust steam condensation into water, recycling, improve energy efficiency; in the chemical industry, can be used in chemical production process of various reaction kettle, heat exchanger and other equipment cooling, control reaction temperature, ensure the smooth progress of chemical reaction; in the metallurgical industry, used in blast furnace, rolling mill and other equipment cooling, maintain the normal working temperature of equipment, prolong the service life of equipment; in the field of air conditioning and refrigeration, for central air conditioning system to provide cooling circulating water, ensure the refrigeration effect of air conditioning system.

[0004] The working principle of mechanical ventilation cooling tower is to pressurize the water to be cooled and delivered to the top of the cooling tower, and then uniformly sprayed on the filler through the water distribution system. Hot water falls from the upper part of the filler. At the same time, unsaturated air enters from the lower part of the tower body and flows upward. In the filler gap, hot water and unsaturated air are in full contact and exchange heat. In this process, air absorbs the heat of hot water and transmits upward, and finally becomes hot air, which is extracted out of the tower by the fan, so as to achieve the purpose of reducing water temperature. However, this working mode also has obvious disadvantages. A large amount of water is evaporated in the heat exchange process with air, resulting in considerable loss of water resources.

[0005] With the increasingly serious global water shortage problem, efficient use of industrial water has become a key problem to be solved. Under this background, water-saving technology based on sound waves has gradually emerged and developed. The application of sound wave technology in water-saving field brings new ideas and possibilities to solve the problem of water waste in cooling tower. However, at present, how to effectively apply sound wave technology to mechanical ventilation cooling tower and effectively improve its water-saving effect is still a technical problem to be solved in the industry. UTILITY MODEL CONTENTS

[0006] The utility model discloses a machine force ventilation cooling tower water recovery system, through setting up the extension wind cylinder at the air outlet of machine force ventilation cooling tower, and setting up the condensed water structure and acoustic generator in its inside, utilize the acoustic generator to emit the sound wave and the hot and humid air in the extension wind cylinder mutual effect, the water vapor carried in the hot and humid air changes the molecular motion state under the action of sound wave, and the condensation process of water vapor is accelerated, and the baffle of longitudinal setting further promotes the condensation effect with acoustic generator, and the water drop that condenses through the action of sound wave adheres on the baffle, slides down and recovers along the baffle surface, greatly reduces the water vapor amount that the hot air is discharged to the tower outside, thereby significantly reduces the water evaporation loss of cooling tower, effectively improves the utilization of water resources, to solve how the technical problem of effectively applying acoustic technology to machine force ventilation cooling tower, and practically improving its water saving effect.

[0007] The utility model discloses a machine force ventilation cooling tower water recovery system, through following technical scheme realization: a machine force ventilation cooling tower water recovery system, including tower body, water collecting pool, filler, water distribution device and fan, the water collecting pool is located at tower body lower extreme, the filler and water distribution device all are located in the tower body, the water distribution device is located the above of filler, the fan is located at tower body upper extreme, still include setting in the air outlet of machine force ventilation cooling tower and with the extension wind cylinder that air outlet links, the extension wind cylinder inside is equipped with condensed water structure along the axial direction, the extension wind cylinder inner wall is equipped with acoustic generator with condensed water structure correspondingly on,

[0008] The condensed water structure includes a plurality of longitudinally arranged baffles, and the sound emitting direction of the acoustic generator intersects the baffles.

[0009] According to a preferred embodiment, the acoustic generator is a low-frequency acoustic generator.

[0010] According to a preferred embodiment, the acoustic generator has a frequency range of 100-2000 Hz.

[0011] According to a preferred embodiment, the acoustic generator is a pneumatic acoustic generator driven by compressed gas.

[0012] According to a preferred embodiment, a plurality of sound wave through holes are formed in the baffle.

[0013] According to a preferred embodiment, a valve is arranged on the compressed gas inlet pipeline connected to each pneumatic acoustic generator.

[0014] According to a preferred embodiment, a water collector is further arranged inside the extension wind cylinder, and the water collector is located above the condensed water structure.

[0015] According to a preferred embodiment, the extension wind cylinder is made of glass fiber reinforced plastic.

[0016] According to a preferred embodiment, the surface of the baffle is provided with a hydrophilic coating.

[0017] According to a preferred embodiment, the extension air duct is coaxially installed with the air outlet, and the upper and lower ends of the extension air duct are provided with annular supports, and the annular supports are provided with supporting legs.

[0018] The technical scheme of the machine forced ventilation cooling tower water recycling system has at least the following advantages and beneficial effects:

[0019] (1) By setting the extension air duct at the air outlet of the machine forced ventilation cooling tower, and setting the condensation structure and the sound wave generator inside the extension air duct, the sound waves emitted by the sound wave generator interact with the hot and humid air in the extension air duct, the water vapor carried in the hot and humid air changes the molecular motion state under the action of the sound waves, and the condensation process of the water vapor is accelerated, and the vertically arranged baffle cooperates with the sound wave generator to further promote the condensation effect, the water droplets condensed by the sound wave action adhere to the baffle and slide down the surface of the baffle for recycling, greatly reducing the amount of water vapor discharged out of the tower with the hot air, thereby significantly reducing the water evaporation loss of the cooling tower and effectively improving the utilization rate of water resources;

[0020] (2) The setting of the sound wave through hole causes diffraction phenomenon when the sound wave passes through, and the sound wave through holes at different positions make the sound waves continue to propagate at different angles and different paths, forming complex and interwoven sound wave propagation paths inside the extension air duct. This propagation mode causes the sound waves in each area divided by the baffle inside the extension air duct to superimpose on each other, thereby forming a strong sound field with superposition effect, effectively avoiding the blind area of sound wave propagation and ensuring that each corner inside the extension air duct can be effectively covered by the sound field. Under the action of this uniform and high-intensity sound field, the water vapor molecules in the hot and humid air can be more fully affected by the sound waves, thereby accelerating the condensation process and improving the overall water-saving effect of the cooling tower;

[0021] (3) The water collector arranged inside the extension air duct is located above the condensation structure, which can further capture the fine water droplets that are not collected by the baffle after being condensed by the sound wave and naturally cooled. Through the cooperative work of the water collector and the condensation structure, the water recovery efficiency in the discharged air is greatly improved, and the water dispersion outside the cooling tower is reduced;

[0022] (4) The extension air duct is made of glass steel material, which has good corrosion resistance and mechanical strength, can adapt to the complex operating environment of the cooling tower, and can ensure long-term stable operation of the equipment;

[0023] (5) The extension air duct is coaxially installed with the air outlet, and is fixed through the annular supports and supporting legs at the upper and lower ends, which ensures the stability of the installation of the extension air duct and reduces the influence of factors such as equipment shaking on the operation effect of the cooling tower;

[0024] (6) The compressed air inlet pipeline connected with each gas dynamic acoustic wave generator is provided with a valve, and an operator can accurately adjust the working state of each acoustic wave generator through the valve according to the actual operation condition of the cooling tower, such as heat load change, environmental temperature and humidity difference, so as to flexibly control the acoustic wave effect and ensure that the best water saving and operation effect can be achieved under different conditions.

[0025] (7) The hydrophilic coating on the surface of the baffle can reduce the contact angle of water and the surface of the baffle, so that water vapor is more easily condensed into water droplets on the surface of the baffle, thereby improving the condensation efficiency and increasing the amount of condensed water. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A schematic diagram of the overall structure of the mechanical ventilation cooling tower is provided for the embodiment 1 of the utility model.

[0027] Figure 2 A front view of the mechanical ventilation cooling tower is provided for the embodiment 1 of the utility model.

[0028] Figure 3 A schematic diagram of the longitudinal section of the mechanical ventilation cooling tower is provided for the embodiment 1 of the utility model.

[0029] Figure 4 A schematic diagram of the condensed water structure is provided for the embodiment 1 of the utility model.

[0030] The drawings show that: 100 is a tower body, 200 is a water collecting pool, 300 is a filler, 400 is a water distribution device, 500 is a fan, 600 is an extended wind cylinder, 700 is a condensed water structure, 710 is a baffle, 711 is an acoustic wave through hole, 712 is a hydrophilic coating, 713 is a water guide groove, 720 is a water collecting groove, 800 is an acoustic wave generator, and 900 is a water collector. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0032] Embodiment 1

[0033] In order to reduce the amount of water vapor discharged with hot air outside the tower, reduce the water evaporation loss of the cooling tower, and further improve the utilization rate of water resources, the utility model applies acoustic wave technology to the mechanical ventilation cooling tower and proposes a mechanical ventilation cooling tower water recovery system based on acoustic wave water collection.

[0034] The water recovery system of the mechanical draft cooling tower based on the sound wave in the embodiment, as shown in Figures 1 to 3 includes a tower body 100, a water collecting pool 200, a filler 300, a water distribution device 400 and a fan 500.

[0035] In some embodiments, the water collecting pool 200 is arranged at the lower end of the tower body 100, which can conveniently collect the condensed water generated in the cooling process in the cooling tower, and provides storage space for the recycling of the cooling water; the filler 300 and the water distribution device 400 are arranged in the tower body 100, and the water distribution device 400 is located above the filler 300, which can uniformly distribute the water to be cooled on the filler 300; the fan 500 is arranged at the upper end of the tower body 100, which can generate negative pressure through the rotation of the impeller, and can suck the cold air outside the tower into the tower and discharge the hot and humid air in the tower; the filler 300 has a large specific surface area, and after the water distribution device 400 uniformly distributes the water to the filler 300, a thin water layer is formed on the surface of the filler 300, which increases the contact area and contact time of the water and the air; when the fan 500 operates, it promotes the air to flow through the filler 300 and fully exchanges heat with the water, and the cold air absorbs the heat of the hot water, so that the hot water is cooled, thereby improving the cooling efficiency of the cooling tower.

[0036] Further, the water recovery system of the mechanical draft cooling tower based on the sound wave in the embodiment further includes an expansion air duct 600 arranged at the air outlet of the mechanical draft cooling tower and connected with the air outlet; the expansion air duct 600 is internally provided with a condensation structure 700 along the axial direction, and the expansion air duct 600 is provided with a sound wave generator 800 on the inner wall corresponding to the condensation structure 700, which utilizes the sound waves emitted by the sound wave generator 800 to interact with the hot and humid air in the expansion air duct 600, thereby accelerating the condensation process of the water vapor.

[0037] In some embodiments, referring to Figure 4 , the condensation structure 700 includes a plurality of longitudinally arranged baffles 710, which extend along the length direction to contact or maintain a certain distance with the inner wall of the expansion air duct 600, which is not specifically limited here; the sound emitting direction of the sound wave generator 800 intersects with the baffle 710, and the longitudinally arranged baffle 710 based on the flow direction of the water vapor makes the water droplets condensed by the sound wave adhere to the baffle 710 and slide down the surface of the baffle 710 for recovery. In some embodiments, the circumferential intersection of the plurality of baffles 710 around the axis of the expansion air duct 600, Figure 4The number of the partition plates 710 is 4, but the number of the partition plates 710 is not limited here, and the number of the partition plates 710 can be any number. The acoustic wave generator 800 is arranged corresponding to the gap between adjacent partition plates 710, and at least one acoustic wave generator 800 is arranged corresponding to the gap between each adjacent partition plates 710. In other embodiments, the partition plates 710 are arranged in a cross shape, that is, the two or more longitudinally arranged partition plates 710 and the two or more transversely arranged partition plates 710 are staggered to form the cross shape. The number of the partition plates 710 is not limited here.

[0038] Further, to avoid the condensed water droplets on the partition plates 710 from falling on the motor of the fan 500 and affecting the operation of the motor or being scattered by the running fan 500, the embodiment is provided with a downwardly inclined water guide groove 713 on the partition plate 710, and a water collecting groove 720 is arranged below the partition plate 710 to collect the condensed water introduced by the water guide groove 713. Further, the outlet side of the water collecting groove 720 is adjacent to the inner wall of the expansion air duct 600, so that the condensed water can slide along the inner wall of the expansion air duct 600 and fall into the tower body 100.

[0039] Specifically, the embodiment is provided with the expansion air duct 600 at the air outlet of the mechanical draft cooling tower, and the condensed water structure 700 and the acoustic wave generator 800 are arranged inside the expansion air duct 600. The acoustic wave generator 800 emits sound waves, which interact with the hot and humid air in the expansion air duct 600. The water vapor carried by the hot and humid air changes its molecular motion state under the action of the sound waves, which accelerates the condensation process of the water vapor. The longitudinally arranged partition plates 710 cooperate with the acoustic wave generator 800 to further promote the condensation effect. The water droplets condensed by the sound waves adhere to the partition plates 710 and slide down the surface of the partition plates 710 to be recycled, which greatly reduces the amount of water vapor discharged out of the tower with the hot air, thereby significantly reducing the water evaporation loss of the cooling tower and effectively improving the utilization rate of water resources.

[0040] Embodiment 2

[0041] The embodiment is based on the technical solution provided in Embodiment 1, and the acoustic wave generator 800 is further described:

[0042] In the embodiment, the acoustic wave generator 800 is a pneumatic acoustic wave generator 800 driven by compressed air, and the sound frequency range is 100-2000 Hz. It should be noted that the working principle of the pneumatic acoustic wave generator 800 is to generate sound waves after compressed air passes through the acoustic wave generator 800. The sound frequency of the acoustic wave generator 800 is 100-2000 Hz, which belongs to medium-low frequency sound waves and will not resonate with equipment and facilities to avoid damage to them.

[0043] Further, the baffle plate 710 is provided with a plurality of sound wave through holes 711; the sound wave through holes 711 are arranged to cause diffraction of the sound wave when the sound wave passes through, and the sound wave through holes 711 at different positions cause the sound wave to continue to propagate at different angles and different paths, forming a complex and interwoven sound wave propagation path in the extension air duct 600; this propagation mode causes the sound waves in each area in the extension air duct 600 divided by the baffle plate 710 to superimpose on each other, thereby forming a strong sound field with superposition effect, effectively avoiding the blind area of sound wave propagation, and ensuring that each corner in the extension air duct 600 can be effectively covered by the sound field; under the action of the uniform and high-intensity sound field, the water vapor molecules in the hot and humid air can be more fully affected by the sound wave, thereby accelerating the condensation process and improving the overall water-saving effect of the cooling tower.

[0044] In addition, a valve is arranged on the compressed air inlet pipeline connected to each of the pneumatic sound wave generators 800; an operator can accurately adjust the working state of each sound wave generator 800 through the valve according to the actual operating conditions of the cooling tower, such as changes in thermal load, differences in environmental temperature and humidity, and the like, to realize flexible control of the sound wave effect and ensure that the best water-saving and operating effect can be achieved under different conditions.

[0045] Embodiment 3

[0046] This embodiment further describes the internal and external structures of the extension air duct 600 based on the technical solution provided in Embodiment 2.

[0047] In terms of material selection, the extension air duct 600 is made of glass fiber reinforced plastic, which has good corrosion resistance and mechanical strength and can adapt to the complex operating environment of the cooling tower to ensure long-term stable operation of the equipment. The surface of the baffle plate 710 is provided with a hydrophilic coating 712, which can reduce the contact angle of water with the surface of the baffle plate 710, so that water vapor is more easily condensed into water droplets on the surface of the baffle plate 710, thereby improving the condensation efficiency and increasing the amount of condensed water.

[0048] Further, the extension air duct 600 is further provided with a water collector 900, which is located above the condensed water structure 700 and can further capture fine water droplets that are not collected by the baffle plate 710 after being condensed by the sound wave and naturally cooled; through the cooperative work of the water collector 900 and the condensed water structure 700, the water recovery efficiency of the water in the discharged air is greatly improved, and the scattering of water outside the cooling tower is reduced.

[0049] Further, the extension air duct 600 is coaxially installed with the air outlet, and the upper and lower ends of the extension air duct 600 are both provided with annular supports, and the annular supports are provided with supporting legs; specifically, the extension air duct 600 is coaxially installed with the air outlet and is fixed through the annular supports and the supporting legs at the upper and lower ends, so that the stability of the installation of the extension air duct 600 is ensured, and the influence of factors such as equipment shaking on the operation effect of the cooling tower is reduced.

[0050] The preferred embodiments of the present application are merely used for limiting the present application, and for those skilled in the art, the present application can be variously changed and altered. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A mechanically ventilated cooling tower water recovery system, comprising a tower body (100), a water collection tank (200), packing material (300), a water distribution device (400), and a fan (500), wherein the water collection tank (200) is located at the lower end of the tower body (100), the packing material (300) and the water distribution device (400) are both located inside the tower body (100), the water distribution device (400) is located above the packing material (300), and the fan (500) is located at the upper end of the tower body (100), characterized in that, It also includes an expansion duct (600) installed at the air outlet of the mechanical ventilation cooling tower and connected to the air outlet. The expansion duct (600) has a condensation structure (700) arranged axially inside. The expansion duct (600) has a sound wave generator (800) on its inner peripheral wall corresponding to the condensation structure (700). The condensation structure (700) includes several longitudinally arranged baffles (710), and the sound generation direction of the sound wave generator (800) intersects with the baffles (710).

2. The mechanical ventilation cooling tower water recovery system as described in claim 1, characterized in that, The sound wave generator (800) is a low-to-medium frequency sound wave generator (800).

3. The mechanical ventilation cooling tower water recovery system as described in claim 2, characterized in that, The frequency range of the sound wave generator (800) is 100 to 2000 Hz.

4. The mechanical ventilation cooling tower water recovery system as described in claim 3, characterized in that, The sound wave generator (800) is a pneumatic sound wave generator (800) driven by compressed air.

5. The mechanical ventilation cooling tower water recovery system as described in claim 4, characterized in that, The partition (710) has several acoustic wave through holes (711).

6. The mechanical ventilation cooling tower water recovery system as described in claim 4, characterized in that, Valves are provided on the compressed air inlet pipes connecting each of the pneumatic acoustic wave generators (800).

7. The mechanical ventilation cooling tower water recovery system as described in claim 1, characterized in that, The expansion duct (600) is also equipped with a water collector (900), which is located above the condensate structure (700).

8. The mechanical ventilation cooling tower water recovery system as described in claim 1, characterized in that, The expansion duct (600) is made of fiberglass.

9. The mechanical ventilation cooling tower water recovery system as described in claim 1, characterized in that, The surface of the partition (710) is provided with a hydrophilic coating (712).

10. The mechanical ventilation cooling tower water recovery system as described in claim 1, characterized in that, The expansion duct (600) is coaxially installed with the air outlet. Both the upper and lower ends of the expansion duct (600) are provided with annular supports, and the annular supports are provided with legs.

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