An energy-saving demisting wet cooling tower

Abstract

The present invention discloses an energy-saving fog-removing wet cooling tower, which comprises a tower body. A wind turbine is arranged on the outer peripheral direction above the tower body, and a rotary phase change condenser driven by the wind turbine to rotate is arranged on the wind turbine. The rotary phase change condenser is embedded above the tower body and exchanges heat with the tower body to realize the condensation and recovery of water vapor in the tower body. The rotary phase change condenser consists of a bottom plate and phase change microcapsule filling cavities annularly distributed on the bottom plate, and phase change microcapsules are filled in the phase change microcapsule filling cavities. The phase change microcapsule filling cavities include an inner ring cavity and an outer ring cavity. An outer ring water guide is arranged between the inner ring cavity and the outer ring cavity, and an inner ring water guide is arranged in the inner ring cavity. The design of the present invention is reasonable, solves the defect of large evaporation loss of wet hot water, and ensures that the cooling tower can operate continuously and efficiently under complex climate conditions, saving energy and water.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial circulating water cooling, and specifically relates to a cooling tower. Background Art

[0002] In the industrial field, the main water-consuming industries include the power generation industry, the steel industry, the petroleum refining industry, the food industry, the textile industry, and the precious metal refining industry. For example, in a thermal power plant, the water loss of a wet cooling tower accounts for 30-55% of the water consumption of the power plant; the blast furnace cooling system in the steel industry mostly uses a wet cooling tower, and the water loss of the wet cooling tower is extremely serious.

[0003] The function of a cooling tower is to conduct heat or heat and mass exchange between the circulating water carrying waste heat and air in the tower, transfer the heat of the water to the air and dissipate it into the atmosphere, so as to achieve the cooling of the circulating water. According to the different ways of contact between the circulating water and air, cooling towers are divided into two forms: dry cooling towers (heat exchange) and wet cooling towers (heat and mass exchange).

[0004] In some water-scarce areas, due to water resource constraints, dry cooling systems are mostly used. In a dry cooling tower, the heat exchange between the circulating water and air is through the heat transfer of the heat exchanger wall surface, and the heat of the water in the pipe is transferred to the air flowing outside the heat exchanger. Because water and air do not come into direct contact, there is no evaporation of water in the dry cooling tower, so there is no evaporation loss of cooling water. However, the heat exchange capacity of the dry cooling tower is much lower than that of the wet cooling tower, and it has more consumables and a higher cost.

[0005] At present, most countries adopt traditional wet cooling systems, spraying the cooling circulating water on the surface of the packing. The circulating water is in direct contact with the air, and through contact heat transfer and evaporative heat dissipation, the heat and part of the mass of the water are transferred to the air, reducing the water temperature. The heat exchange efficiency of a wet cooling tower is relatively high, and the ultimate temperature at which the water is cooled is the wet bulb temperature of the air. However, the cooling water causes water consumption due to the evaporation of water during the cooling process. Moreover, the evaporation of water increases the salinity of the circulating cooling water. In order to stabilize the water quality, the methods of adding medicine and side filtration and sewage discharge are often used. Among them, the sewage discharge method is widely used because of its low investment and operation costs. Its treatment method is to discharge a part of the water with a higher salinity, and at the same time, make up water to reduce the salinity, which means further water loss. In addition, the water drift phenomenon at the top of the wet cooling tower also causes water loss. At the same time, water vapor in the wet air will condense into water mist at the outlet of the cooling tower, causing environmental light pollution and affecting the local microclimate environment. In the northern regions of China, icing will also occur above the air inlet in winter.

[0006] In summary, the main water losses of a wet cooling tower include three parts: evaporation water loss, wind-blown water loss, and sewage discharge loss, among which the evaporation water loss accounts for the largest proportion. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an energy-saving fog-removing wet cooling tower, aiming to solve the problem of large water loss in wet cooling towers, reduce energy consumption, and achieve water and energy conservation.

[0008] The technical solution for the present invention to solve the technical problem is as follows:

[0009] An energy-saving fog-removing wet cooling tower, including a tower body, a wind turbine is arranged on the outer peripheral direction above the tower body, and a rotary phase change condenser driven by the wind turbine to rotate is arranged on the wind turbine; the rotary phase change condenser is embedded above the tower body and exchanges heat with the tower body to realize the condensation and recovery of water vapor in the tower body.

[0010] The rotary phase change condenser consists of a bottom plate and phase change microcapsule filling cavities annularly distributed on the bottom plate, and phase change microcapsules are filled in the phase change microcapsule filling cavities; the phase change microcapsule filling cavities include an inner ring cavity and an outer ring cavity; an outer ring water guide is arranged between the inner ring cavity and the outer ring cavity, and an inner ring water guide is arranged in the inner ring cavity; a water collecting tank is arranged on the bottom plate; the outer ring water guide and the inner ring water guide are connected to the water collecting tank.

[0011] A water collector, a spray cooling nozzle, a filler, a fan, a storage pool, a water collector and a water baffle are arranged in the tower body; an air inlet is arranged on the tower body, and the air inlet is located between the water collector and the storage pool and is arranged around the tower body; the water collector is arranged below the filler.

[0012] A fixing frame is also arranged in the tower body; the filler is arranged on the fixing frame.

[0013] The wind turbine consists of a wind turbine connecting rod, wind turbine blades, a coupling and a driving shaft; the wind turbine blades are fixed on the wind turbine connecting rod, the wind turbine connecting rod is connected to the driving shaft through the coupling; the driving shaft rotates under the drive of the wind turbine blades.

[0014] The wind turbine blades consist of vertical blades and horizontal blades.

[0015] The water collector is provided with a plurality of upper grooves and lower grooves, the lower grooves are located below the upper grooves and are parallel to the upper grooves; the upper grooves and the lower grooves are arranged in a staggered manner, and the edges of the upper grooves and the adjacent lower grooves are on the same vertical line; the upper grooves are generally V-shaped in cross-section and the groove openings face upward; the lower grooves are generally octagonal in cross-section with the upper three sides missing and the groove openings face upward; the upper grooves are fixed by support members; the lower grooves are fixed by a plurality of slender partition plates.

[0016] A hinged baffle is provided at the bottom of the upper tank; one end of the hinged baffle is fixed to the bottom surface of the upper tank, and the other end is free, and its length is controlled by the distance between the upper tank and the lower tank; the hinged baffle swings freely around the support member.

[0017] The cross-sectional shape of the support member is I-shaped, with the upper end fixed to the bottom of the packing and the lower end fixed to the bottom surface of the upper tank; the slender partition plate has an I-shaped cross-section, with the upper end fixed to the bottom of the packing and the lower end fixed to the bottom surface of the lower tank.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. A rotary phase change condenser is provided inside the cooling tower. The rotary phase change condenser is arranged on the linkage shaft and uses phase change microcapsule materials for condensation; one-fourth of it is embedded in the tower body and is driven to rotate by a wind turbine. The rotary phase change condenser recovers the water vapor of nearly saturated or saturated wet air from above the dewaterer of the cooling tower. By directly or indirectly cooling the wet air, when the temperature of the wet air decreases, the saturated wet air condenses, reducing evaporation and drift losses, reducing the amount of makeup water, and being beneficial to water conservation and environmental protection (as Figure 1 shown);

[0020] 2. Through experimental verification and comparison, compared with the traditional condensing dewatering device, the average water saving rate of the rotary phase change condenser is 30%, which is 10% higher than that of the traditional condensing dewatering device. In addition, the rotary design can keep the condenser maintaining a relatively high water saving rate all the time, that is, when the water saving rate is lower than 30%, the part that has not undergone phase change condensation can be sent into the cooling tower by rotating the condenser, so that the phase change condenser is always in a high water saving state (as Figure 2 shown);

[0021] 3. The rotary phase change condenser is driven by a wind turbine, making full use of the crosswind brought by the ventilation of the cooling tower and the environment to drive the rotation without consuming additional energy;

[0022] 4. The wind turbine blades are composed of vertical blades and horizontal blades, making full use of the crosswind force and the lift force brought by the upper and lower pressure differences. Under the action of the reducer, there is enough power to drive the rotary phase change condenser to rotate;

[0023] 5. The reducer ensures that the wind turbine can drive the rotary phase change condenser to rotate at a stable rotational speed, so as to ensure that the material can be fully mixed with the liquid water droplets in the cooling tower before the hot and humid gas is cooled by the wind blow loss, and after mixing, it can fully exchange heat with the external environment and the phase change material is re-solidified and regenerated, and water is precipitated. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the cooling tower of the present invention;

[0025] Figure 2 Schematic diagram of the position of the rotary phase change condenser;

[0026] Figure 3 Top view of the central cross-section of the rotary phase change condenser;

[0027] Figure 4 Profile view of the central cross-section of the rotary phase change condenser;

[0028] Figure 5 Front view of the bottom water collecting tank;

[0029] Figure 6 Profile view of the central cross-section of the bottom water collecting tank;

[0030] Figure 7 Developed view of the outer ring water collecting tank;

[0031] Figure 8 Developed view of the inner ring water collecting tank;

[0032] Figure 9 Axonometric view of the wind turbine;

[0033] Figure 10 Top view of the wind turbine;

[0034] Figure 11 Schematic diagram of the structure of the water collector;

[0035] Figure 12 Variation law of the water saving rate of the rotary phase change condenser with time. Embodiment

[0036] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings:

[0037] As Figure 1 shown, an energy-saving fog-removing wet cooling tower of the present invention includes a conventional cooling tower structure part, a wind turbine, and a rotary phase change condenser 15.

[0038] The conventional cooling tower structure part includes a tower body 1, a water collector 2, a spray cooling nozzle 3, a packing 4, a fan 5, a storage pool 6, an air inlet 7, a water collector 9, a water baffle 16, and related pipelines;

[0039] The tower body 1 is an induced draft mechanical ventilation cooling tower, and the top view projection of the tower body 1 is rectangular;

[0040] The air inlet 7 is located between the water collector 9 and the storage pool 6 and is arranged around the tower body 1;

[0041] The water collector 9 is arranged below the packing 4;

[0042] The water collector 9 is composed of an upper trough 9A, a lower trough 9B, a support member 9C, an elongated partition plate 9D and a hinged baffle plate 9E; the upper trough 9A is fixed by the support member 9C; the cross-sectional shape of the support member 9C is an I-shaped, the upper end of which is fixed to the bottom of the filler 4, and the lower end is fixed to the bottom surface of the upper trough 9A; the lower trough 9B is fixed by a plurality of elongated partition plates 9D; the cross-sectional shape of the elongated partition plate 9D is an I-shaped, the upper end of which is fixed to the bottom of the filler 4, and the lower end of which is fixed to the bottom surface of the lower trough 9B: the hinged baffle plate 9E is arranged on both sides of the bottom of the upper trough 9A and can rotate around the bottom (see Figure 11 The free end of the first hinged baffle 9E on the left side is just located on the lower groove 9B, the free end of the second hinged baffle 9E on the left side is just in the horizontal direction, and the third hinged baffle 9E on the left side is turned upward), and the length of the hinged baffle 9E is controlled by the distance between the upper groove 9A and the lower groove 9B;

[0043] A shutter 10 with adjustable opening and air inlet direction is arranged outside the air inlet 7;

[0044] The fixing frame 8 is located above the water collector 9, adjacent to the water collector 9, and has a cross shape when viewed from above;

[0045] The wind turbine is fixed on the left and right sides above the tower body 1; the wind turbine is composed of a wind turbine connecting rod 11, a wind turbine blade 12, a coupling 13, and a linkage shaft 14. The wind turbine blade 12 is fixed on the wind turbine connecting rod 11, and the wind turbine connecting rod 11 is connected to the linkage shaft 14 through the coupling 13. Driven by the wind turbine blade 12, the linkage shaft 14 rotates;

[0046] The rotary phase-change condenser 15 is disposed on the linkage shaft 14 and rotates together with the linkage shaft 14;

[0047] The connection relationship between the rotary phase change condenser 15 and the tower body 1 is shown in FIG. Figure 2 The same size of fan-shaped notches are respectively opened on the left and right sides of the upper part of the tower body 1. The rotary phase-change condenser 15 is arranged at the fan-shaped notches on the left and right sides of the upper part of the tower body 1, so that the rotary phase-change condenser 15 can enter;

[0048] The rotary phase change condenser is driven by the wind turbine connecting rod 11 and rotates along with the wind turbine blades 12;

[0049] The rotary phase change condenser 15 is composed of a bottom plate and a phase change microcapsule filling cavity distributed in an annular shape on the bottom plate, in which phase change microcapsules 15A are filled; the phase change microcapsule filling cavity includes an inner ring cavity and an outer ring cavity, an outer ring water guide 15B is arranged between the inner ring cavity and the outer ring cavity, and an inner ring water guide 15D is arranged in the inner ring cavity; a water collecting trough 15C is arranged on the bottom plate; the outer ring water guide 15B and the inner ring water guide 15D are connected to the water collecting trough 15C;

[0050] The rotary phase change condenser 15 is placed above the fan 5, symmetrically arranged relative to the cooling tower body and embedded in the cooling tower wall, and the volume embedded inside the cooling tower accounts for one - quarter of the rotary phase change condenser.

[0051] Both the inner - ring cavity and the outer - ring cavity are formed by sleeves. There is a channel left between the inner walls of the sleeves, and water guides with a certain inclination angle are arranged on the inner walls of the sleeves to drain the condensed water of the water mist out of the tower into the water collection tank 15C.

[0052] The function of the phase - change microcapsules 15A is to condense water vapor; the functions of the outer - ring water guide 15B and the inner - ring water guide 15D are to collect condensed water; the function of the water collection tank 15C is to introduce the collected condensed water into the water collector.

[0053] The rotary phase change condenser 15 uses phase - change microcapsule materials for condensation; when the rotary phase change condenser 15 operates, it rotates clockwise around the center of the concentric circles, does not contact the tower body, and half of it enters the tower body 1, and is driven by the wind turbine to rotate.

[0054] The wind turbine blades 12 are composed of vertical blades 12A and horizontal blades 12B.

[0055] The water baffle 16: Its structure is usually composed of a group of vertical or inclined metal or plastic slats. These slats are installed between the spray system and the tower packing and are arranged at a certain interval to prevent the spray water from directly falling back into the pool, but being dispersed on the tower packing to increase the heat - exchange surface area and improve the cooling efficiency.

[0056] The water collector 2: Its structure is usually composed of a group of horizontal pipes or boxes. These pipes or boxes are fixed at the bottom of the cooling tower through brackets to form a water collection area. Its main function is to collect the cooling water flowing through the tower packing and circulate it back to the heating equipment to achieve the purpose of circulating cooling.

[0057] The spray cooling nozzle 3: Its function is to spray out the cooling water.

[0058] The packing 4: Generally made of polyurethane, polypropylene, plate - type PVC, metal, etc., its function is to provide the largest possible heat - exchange area for water and air.

[0059] The fan 5: Axial - flow fans are used for induced - draft cooling towers; axial - flow / centrifugal fans are used for forced - draft cooling towers.

[0060] The fixing frame 8: Its main function is to provide a supporting and stable structure to maintain the position and stability of the tower packing and other structural components.

[0061] In summary, the present invention relates to a cooling tower that combines a wet cooling method to cool circulating water. It utilizes a phase change material for condensation and at the same time employs a vertical axis wind turbine that utilizes the ventilation of the cooling tower and the natural wind force of the environment to drive the condenser to rotate, ensuring the flexible and efficient operation of the cooling tower under complex climate conditions and achieving the effects of energy conservation and water conservation.

Claims

1. An energy-saving demisting wet cooling tower, comprising a tower body, characterized in that: A wind turbine is provided in the outer peripheral direction above the tower body, and a rotary phase change condenser driven to rotate by the wind turbine is provided on the wind turbine; the rotary phase change condenser is embedded above the tower body to realize the condensation recovery of water vapor in the tower body through heat exchange with the tower body. The rotary phase change condenser consists of a bottom plate and phase change microcapsule filling cavities distributed in a ring shape on the bottom plate, and phase change microcapsules are filled in the phase change microcapsule filling cavities; the phase change microcapsule filling cavities include an inner ring cavity and an outer ring cavity; an outer ring water guide is arranged between the inner ring cavity and the outer ring cavity, and an inner ring water guide is arranged in the inner ring cavity; a water collecting tank is arranged on the bottom plate; the outer ring water guide and the inner ring water guide are connected to the water collecting tank.

2. The energy-saving demisting wet cooling tower according to claim 1, characterized in that: A water collector, a spray cooling nozzle, a packing, a fan, a storage pool, a water collector and a water baffle are arranged in the tower body; an air inlet is arranged on the tower body, and the air inlet is located between the water collector and the storage pool and is arranged around the tower body in a circumferential manner; the water collector is arranged below the packing.

3. The energy-saving demisting wet cooling tower according to claim 2, wherein: A fixing frame is also arranged in the tower body; the packing is arranged on the fixing frame.

4. The energy-saving demisting wet cooling tower according to any one of claims 2-3, characterized in that: The wind turbine is composed of a wind turbine connecting rod, wind turbine blades, a coupling and a driving shaft; the wind turbine blades are fixed on the wind turbine connecting rod, and the wind turbine connecting rod is connected to the driving shaft through the coupling; the driving shaft rotates under the drive of the wind turbine blades.

5. The energy-saving demisting wet cooling tower according to claim 4, characterized in that: The wind turbine blades are composed of vertical blades and horizontal blades.

6. The energy-saving demisting wet cooling tower according to claim 4, wherein: The water collector is provided with a plurality of upper grooves and lower grooves, the lower grooves are located below the upper grooves and are parallel to the upper grooves; the upper grooves and the lower grooves are arranged in a staggered manner, and the edges of the upper grooves and the adjacent lower grooves are on the same vertical line; the upper grooves are generally in a V-shaped cross-sectional shape with the groove opening upward. The lower grooves are generally in a regular octagonal cross-sectional shape missing the upper three sides with the groove opening upward. The upper grooves are fixed by support members; the lower grooves are fixed by a plurality of slender partition plates.

7. The energy-saving demisting wet cooling tower according to claim 6, characterized in that: A hinged baffle is arranged at the bottom of the upper groove; one end of the hinged baffle is fixed to the bottom surface of the upper groove, and the other end is free, and the length is controlled by the distance between the upper groove and the lower groove; the hinged baffle swings freely around the support member.

8. The energy-saving demisting wet cooling tower according to claim 6, wherein: The cross-sectional shape of the support member is I-shaped, the upper end is fixed to the bottom of the packing, and the lower end is fixed to the bottom surface of the upper groove; the slender partition plate is in an I-shaped cross-section, the upper end is fixed to the bottom of the packing, and the lower end is fixed to the bottom surface of the lower groove.

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