CN110567290A - A device and method for eliminating white smoke from unsaturated high-humidity tail gas - Google Patents

Abstract

The invention discloses a device and method for eliminating white smoke from unsaturated high-humidity tail gas. The device includes a water collection and white smoke removal tower. A number of heat exchange modules are arranged horizontally in the air inlet, and a main moisture flue is provided under the water collection and whitening tower, and a number of air passages are arranged obliquely in the heat exchange module with the lower end communicating with the atmosphere and the upper end communicating with the air inlet. And there are several wet gas channels whose upper ends communicate with the air inlet and whose lower ends communicate with the wet gas main flue through the wet gas branch flues; each wet gas branch flue is provided with a water collecting unit. The present invention uses a heat exchange module with multi-layer cross-flow channels to perform cross-flow indirect heat exchange between unsaturated high-humidity flue gas and ambient air, greatly increasing the heat exchange area between wet flue gas and ambient air, and promoting unsaturated wet flue gas Rapid condensation and efficient recovery of condensed water through the water collection unit reduce the operating cost of the high-humidity flue gas treatment device.

Description

A device and method for eliminating white smoke from unsaturated high-humidity tail gas

technical field

The invention belongs to the technical field of resource and environmental protection, and in particular relates to a device and method for eliminating white smoke from unsaturated high-humidity tail gas.

Background technique

In the industrial production process, the intermediate products in a large number of production processes are in a wet state or have a high moisture content, while the products entering the lower-level process are required to be in a dry state. In order to ensure continuous production and improve production efficiency, it is often necessary to adjust the wet state or Intermediate products with higher moisture content are dried. Material drying mainly uses the heat source to heat the wet material, and evaporates the water in the material into gaseous water to discharge, so as to realize the drying treatment of the material. During the drying process of industrial materials, some high-temperature hot air is sent into contact with the materials, and the use of hot air flow to increase the evaporation rate of water can greatly reduce the drying time, reduce the volume of the drying device and the investment and operation costs, so this kind of drying Dry process is widely used in industrial production process.

After the drying is completed, the mixture of water vapor and hot air in the material forms a drying tail gas. The drying tail gas is unsaturated high-humidity flue gas. The exhaust temperature is generally 50°C-90°C, and the relative saturation of water vapor is as high as 70%-95%, depending on the nature of the material, there is still a small amount of fine particle dust in the drying tail gas.

The unsaturated high-humidity drying exhaust gas is discharged into the atmosphere with the exhaust system. After contacting the low-temperature ambient air for heat exchange, the temperature of the flue gas is rapidly condensed and cooled to a supersaturated state, and a large amount of water vapor is condensed into fine mist droplets. An obvious white smoke tail is formed near the smoke mouth, causing serious visual pollution. A large number of enterprises with drying devices are often distributed in densely populated industrial factories and urban suburbs. In winter, in a low-temperature and static wind environment, the white smoke formed by high-humidity exhaust gas in the area near the exhaust outlet is difficult to diffuse due to the density. Suspended condensed water droplets are continuously enriched near the discharge area, greatly increasing the relative humidity of the ambient air; in a relatively high humidity environment, residual gaseous pollutants in the air can easily use suspended droplets as a carrier to undergo complex physical and chemical reactions to form ultra- Fine particulate matter, and then promote the formation of regional haze weather, seriously affecting people's production, life and health. At the same time, the unsaturated high-humidity drying tail gas also discharges a large amount of unrecoverable gaseous moisture into the environment, resulting in large water consumption and high water cost for industrial enterprises.

At present, for the treatment of saturated or supersaturated high-humidity white smoke, there are mainly direct heating method, air mixing method, condensation reheating method, etc. Both the direct heating method and the condensation reheating method require an external heating source to heat up the high-humidity flue gas, and reducing the humidity of the flue gas to eliminate white smoke requires a large number of external heating sources. The heat source added by the heating method white smoke elimination technology needs to be provided by increasing the amount of coal burned. The energy consumption of the system operation is relatively high, and the newly increased amount of coal burned will also increase pollutant emissions. The mixed air method is to reduce the mixed flue gas below the saturated humidity after mixing a large amount of ambient air with high-humidity flue gas, so as to realize the unsaturated emission of the flue gas, thereby eliminating the white smoke; affected by the ambient temperature, it often requires a larger The amount of ambient air is mixed with the desulfurized saturated wet flue gas, the air mixing device occupies a large area, and the energy consumption of the mixing fan is high. For unsaturated high-humidity flue gas, especially drying high-humidity tail gas, the flue gas volume is small (the flue gas volume of the general drying process is less than 200000Nm3/h), and the flue gas temperature is high (most of the drying tail gas exhaust The temperature is 50°C-100°C), high humidity and other characteristics, which are not suitable for the existing whitening process with high investment cost, high energy consumption and large area occupation. Therefore, for unsaturated, high-humidity, and low-volume flue gas such as drying tail gas, it is necessary to develop a matching white smoke elimination technology with obvious effects, low energy consumption, small footprint, objective water collection, and stable operation. At present, the white smoke elimination technology for unsaturated high-humidity exhaust gas such as drying exhaust gas is still blank.

Contents of the invention

The technical problem to be solved by the present invention is to provide an unsaturated high-humidity tail gas white smoke elimination device and method, respectively diverting unsaturated high-humidity flue gas and ambient air into the heat exchange module packing with multi-layer cross-flow channels for Condensation and heat exchange, condensing most of the water vapor in the unsaturated flue gas into liquid water for recovery, and mixing the low-temperature saturated flue gas and high-temperature ambient air after heat exchange until it is unsaturated and discharged from the exhaust port to achieve The unsaturated high-humidity flue gas has no white smoke emission, and the water recovered by condensation is recycled through the liquid collection unit, which reduces the operating cost of the system.

The present invention is realized as follows, providing a device for eliminating white smoke from unsaturated high-humidity tail gas, comprising a water collection and white smoke removal tower, the outlet at the upper end of the water collection and white removal tower is used as an exhaust port, and the lower end of the water collection and white removal tower is used as an air inlet , a number of heat exchange modules are horizontally arranged in the air inlet, and a main wet gas flue is provided under the water collection and whitening tower, and several heat exchange modules are arranged obliquely in the lower end to communicate with the atmosphere, and the upper end to communicate with the air inlet. The air channel, and several wet gas channels with upper ends connected to the air inlet and lower ends connected to the wet gas main flue through the wet gas branch flue are arranged obliquely; each wet gas branch flue is equipped with a water collecting unit, and the water collecting unit is arranged in each wet gas branch flue The unit accumulates and recycles liquid water from condensation in the moisture channel.

Further, each heat exchange module includes a plurality of first heat exchange plates and second heat exchange plates stacked up and down at intervals, and each of the first heat exchange plates and second heat exchange plates is respectively provided with a number of channels side by side, wherein the first heat exchange plate Each channel of the plate is used as a moisture channel, each channel of the adjacent second heat exchange plate is used as an air channel, and each moisture channel in each first heat exchange plate is crossed with each air channel in each second heat exchange plate.

Further, each heat exchange module is divided into two groups in sequence horizontally, and the grouped two groups of heat exchange modules are distributed in a V shape, and the angle a between them is 34°-106°, and the two groups of heat exchange modules The lower ends of the wet gas channels 411 are connected obliquely inwardly by the same wet gas branch flue 8 and the wet gas main flue 2, and the upper ends are connected obliquely outwardly with the air inlets 12 respectively; the heat exchange modules are respectively sealed and connected , the length ratio of the moisture channel to the air channel is 1:1-5:1.

Further, the water collection unit includes a water collection tank and a water guide. The water collection tank is welded to the side walls on both sides of the wet gas branch flue, and forms a cavity with an upper opening with the side walls of the wet smoke branch flue. There are perforated plates above the water receiving tanks, and a drain connected to the water receiving tanks is provided outside the moisture branch flue. The wet flue gas in the flue passes through the wet gas branch flue, passes through the water guide and enters the air inlet 12 through each wet gas channel, and the liquid water produced by the condensation of the wet gas channel 411 flows to the perforated plate through the water guide, and is passed through the water guide. The perforated plate accumulates and guides the water into the water receiving tank, and discharges it through the drain for recycling.

Further, a cleaning device for cleaning the water guide is provided under the water guide, and the cleaning device includes several nozzles facing the water guide module and external water supply pipes that supply water to the nozzles; The water-guiding modules distributed in a font shape, each water-guiding module respectively includes a number of wave-shaped water-guiding blades distributed in a row in the horizontal direction, and a liquid-contacting baffle is arranged on one side of the wave-shaped water-guiding blades between adjacent wave-shaped water-guiding blades; The water guide groove formed by the liquid baffle and the wave-shaped water guide blade on the side is connected to the perforated plate obliquely to the outside; the liquid water produced after the condensation of the moisture channel flows to the perforated plate through the water guide groove, and is accumulated and guided into the water receiving tank by the perforated plate.

Further, an air mixing device is provided between the heat exchange module and the exhaust port in the water collection and whitening tower, and the air mixing device includes a partition and several swirl turbines, and the periphery of the partition is sealed in the water collection and whitening tower , a number of installation holes are arranged on the partition, and swirl turbines are respectively arranged in each installation hole. The radial distribution is between the fixed sleeve and the central shaft, and the radial outer side of each fixed sleeve is connected with each installation hole.

Further, the height h of the water guide is 0.5m-1.2m, the thickness of the water guide vanes is 0.5mm-3mm, the distance T between adjacent water guide vanes is 10mm-35mm, and the water guide modules are distributed in a herringbone shape on both sides The angle β between them is 34°-106°.

A method for eliminating white smoke using the unsaturated high-humidity tail gas white smoke eliminating device described in any one of claims 1-8, comprising the steps of:

1) The unsaturated high-humidity flue gas is diverted to each wet gas branch flue through the wet gas main flue, flows upward along the wet gas branch flue, passes through the water guide, and then enters the heat exchange module through the wet gas channel for heat exchange After cooling down, low-temperature saturated high-humidity flue gas is formed, and flows upward through the air inlet and is discharged into the water collection and whitening tower, and is discharged from the exhaust port to the outside of the water collecting and whitening tower. At this time, the top area of the water collecting and whitening tower forms Negative pressure; the unsaturated high-humidity flue gas is condensed by the heat exchange module to a supersaturated state, and a large amount of water vapor in the flue gas condenses to form liquid water, which is accumulated by the water guide to the water collection tank, and then discharged from the drain for recycling;

2) Under the action of negative pressure in the water collection and whitening tower, the low-temperature ambient air passes through the air channel outside the water collecting and whitening tower to form high-temperature air, and then enters the water collecting and whitening tower and flows upward;

3) The low-temperature saturated high-humidity flue gas and high-temperature air in the water collection and whitening tower are quickly mixed evenly under the turbulence of the air mixing device, and the flue gas reaches an unsaturated state. The mixed unsaturated flue gas is discharged from the water collection and whitening tower The exhaust port realizes no white smoke emission.

Further, step 1) unsaturated high-humidity flue gas forms condensed water when it passes through the wet gas channel of the heat exchange module, and flows out along the bottom of the wet gas channel under the action of gravity and falls into the water guide. The water guide tank accumulates and diverts the water, and then drains it to the water receiving tank through the porous water guide plate, and discharges the water from the drain outlet to the white collecting tower for recycling, so as to realize the recovery of high-humidity flue gas water resources.

Further, by installing a cleaning device under the water guide, the water guide is intermittently flushed to prevent the dust particles in the flue gas from adhering to and blocking the water guide. The liquid-gas ratio of the cleaning water is 0.1L/Nm ³ -0.5L /Nm ³ , the distance between the cleaning nozzle and the bottom of the water guide is 0.2m-0.7m.

Compared with the prior art, the unsaturated high-humidity tail gas white smoke elimination device and method provided by the present invention adopts a heat exchange module with multi-layer cross-flow channels to exchange unsaturated high-humidity flue gas and ambient air indirect cross-flow Heat, greatly increasing the heat exchange area between wet flue gas and ambient air, promoting rapid condensation of unsaturated wet flue gas, and realizing efficient recovery of condensed water through the water collection unit, reducing the operating cost of high-humidity flue gas treatment devices;

Condensate the unsaturated high-humidity flue gas to recover most of the moisture in the flue gas, reduce the water vapor content in the flue gas, and then use the self-extraction force generated by the smoke exhaust process as the power source to mix the air to reduce the humidity of the exhaust smoke and eliminate the whitening process There is no need to add other heat sources to reheat the flue gas, and it can reduce the air volume of the mixed air, and the energy consumption of the flue gas whitening process is low;

By intersecting the moisture channel and the air channel of the heat exchange module in a cross-stacked manner and setting them in an inclined manner, the condensed water flowing downward and the wet flue gas flowing upward will be stratified during the condensation process to reduce the resistance of the system; A cleaning device is installed under the water guide to intermittently wash the water guide to prevent dust particles in the flue gas from adhering to and blocking the water guide, and greatly improving the operation stability of the system;

Condensed water is formed when the unsaturated high-humidity flue gas passes through the wet gas channel of the heat exchange module, and flows out along the bottom of the wet gas channel under the action of gravity and falls into the water guide, where it is accumulated and guided by the water guide groove between the water guide vanes And through the porous water guide plate, the water is drained to the water collection tank, and the water is discharged out of the water collection and whitening tower from the drain for recycling, so as to realize the recovery of high-humidity flue gas water resources.

Description of drawings

Fig. 1 is a schematic plan view of a preferred embodiment of an unsaturated high-humidity tail gas white smoke elimination device;

Figure 2 is a schematic diagram of the installation structure of two groups of heat exchange modules and wet gas branch flues after grouping in pairs;

Fig. 3 is a schematic structural diagram of a single heat exchange module in Fig. 2 .

Fig. 4 is a schematic structural view of the first heat exchange plate in Fig. 3;

Fig. 5 is a schematic structural view of the second heat exchange plate in Fig. 3;

FIG. 6 is a schematic diagram of the assembly of the first heat exchange plate and the second heat exchange plate 42 stacked at intervals in FIG. 3;

Figure 7 is an enlarged schematic diagram of the installation structure of the water eliminator and the wet gas branch flue;

FIG. 8 is a schematic diagram of the layout of the wave-shaped water-guiding blades 301 of the water-guiding module in FIG. 7 .

Fig. 9 is a schematic top view of the air mixing device in Fig. 1 .

Fig. 10 is a schematic diagram of the three-dimensional structure of the knob turbine in Fig. 9 .

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Embodiment 1: Please refer to Fig. 1 to Fig. 9, a device for eliminating white smoke of unsaturated high-humidity tail gas according to the present invention includes a water collection and white removal tower 1, and the outlet at the upper end of the water collection and white removal tower 1 is used as an exhaust port 11. The lower end of the water collection and whitening tower 1 is used as an air inlet 12, and a number of heat exchange modules 4 are arranged horizontally in the air inlet 12, and a moisture main flue 2 is arranged under the water collecting and whitening tower 1. The heat exchange The module 4 is obliquely provided with several air passages 421 whose lower ends communicate with the atmosphere and whose upper ends communicate with the air inlet 12, and several upper ends communicate with the air inlet 12, and whose lower ends communicate with the moisture through the moisture branch flue 8. The wet gas channel 411 connected to the main flue 2; each wet gas branch flue 8 is provided with a water collecting unit 3, and the liquid water condensed in the wet gas channel 411 is accumulated and recycled through the water collecting unit 3. Each wet gas branch flue 8 is vertically installed and communicated with the wet gas main flue 2, and the upper end peripheral side is connected with the moisture channel 411 on the same side of the heat exchange module 4. Avoid spills.

Each heat exchange module 4 includes a plurality of first heat exchange plates 41 and second heat exchange plates 42 stacked up and down at intervals. Each of the first heat exchange plates 41 and the second heat exchange plates 42 is respectively provided with a number of channels in parallel in a horizontal direction, wherein the first Each channel of the heat exchange plate 41 is used as a moisture channel 411, and each channel of the adjacent second heat exchange plate 42 is used as an air channel 421, and each moisture channel 411 in each first heat exchange plate 41 and each second heat exchange plate Each air channel 421 in 42 is crossed.

The heat exchange modules 4 are grouped in pairs in turn in the horizontal direction, and the grouped two groups of heat exchange modules 4 are distributed in a V shape, and the angle a between them is 34°-106°, and the two groups of heat exchange modules 4 The lower ends of the wet gas channels 411 are connected obliquely inwardly by the same wet gas branch flue 8 and the wet gas main flue 2 , and the upper ends are connected obliquely outwardly with the air inlets 12 respectively; the heat exchange modules 4 are respectively sealed connection, the length ratio of the moisture channel 411 to the air channel 421 is 1:1-5:1.

The water collection unit 3 includes a water collection tank 31 and a water guide 32. The water collection tank 31 is welded to the side walls of the wet gas branch flue 8, and forms an upper opening with the side walls of the wet flue gas branch flue 8. The cavity, the top of the water receiving tank 31 are respectively provided with a porous plate 33, the moisture branch flue 8 is provided with a drain 34 connected with the water receiving tank 31, and the two sides of the water guide 32 are respectively connected with the porous plate 33 and placed on the two sides. On the upper side between the side receiving water tanks 31, the wet flue gas in the wet gas main flue 2 passes through the wet gas branch flue 8, passes through the water guide 32, and enters the air inlet 12 through each wet gas channel 411, and the wet gas channel The liquid water produced after 411 condensation flows to the porous plate 33 through the water guide 32, accumulates and guides the flow into the water receiving tank 31 from the porous plate 33, and discharges it through the water outlet 34 for recycling, that is, the water guide 32 can realize the flow of air from The water flows downward and upward, and the water flows along the water guide 32, passes through the water guide 32, passes through the perforated plate 33, and accumulates in the water receiving tank 31 on the side wall of the wet flue gas branch flue 8. An inwardly inclined water deflector 311 is provided on the inward edge of the water receiving tank 31 .

A cleaning device 7 for cleaning the water guide is provided below the water guide 32, the cleaning device 7 includes a number of nozzles 71 facing the water guide module and an external water supply pipe 72 that supplies water to the nozzles 71; the water guide 32 includes Two groups of water-guiding modules 30 distributed in a herringbone shape, each water-guiding module 30 respectively includes a number of wave-shaped water-guiding blades 301 distributed in rows in the transverse direction, and the wave-shaped water-guiding blades 301 on one side between each wave-shaped water-guiding blade 301 are adjacent to each other. The liquid contact baffle 302 is provided; the water guide groove 300 formed by each liquid contact baffle 302 and the side wave water guide vane 301 is connected obliquely to the outside with the porous plate 33; the liquid water produced after the moisture channel 411 condenses passes through the water guide groove 300 It flows to the perforated plate 33, and is accumulated and diverted into the water receiving tank 31 by the perforated plate 33.

As shown in Figures 9 and 10, an air mixing device 5 is provided between the heat exchange module 4 and the exhaust port 11 in the water collection and whitening tower 1, and the air mixing device 5 includes a partition 51 and several swirl turbines 50, the peripheral side of the partition 51 is packaged in the water collection and whitening tower 1, a number of installation holes 510 are arranged on the partition 51, and a swirl turbine 50 is respectively arranged in each installation hole 510, and each swirl turbine 50 includes a plurality of turbines respectively. The blade 501, the fixed sleeve 500 and the central shaft 502, the central shaft 502 is arranged in the axial center of the fixed sleeve 500, and several turbine blades 501 are radially distributed between the fixed sleeve 500 and the central shaft 502, and each fixed sleeve 500 is radially outside and each Mounting holes 510 are connected. The low-temperature saturated high-humidity flue gas and high-temperature air below the partition 51 form a vortex after passing through the air mixing device 5, so that the low-temperature saturated high-humidity flue gas and high-temperature air are mixed and discharged into the top of the partition 51 and discharged from the exhaust port 11 .

The height h of the water guide 32 is 0.5m-1.2m, the thickness of the water guide vanes 301 is 0.5mm-3mm, the distance T between each water guide vane 301 is 10mm-35mm, and the water guide modules are distributed in a herringbone shape on both sides The angle β between 30 is 34°-106°.

Embodiment 2: Please refer to Fig. 1 to Fig. 10, on the basis of Embodiment 1, a method for eliminating white smoke with unsaturated high-humidity tail gas includes the following steps:

1) Unsaturated high-humidity flue gas is diverted to each wet gas branch flue 8 through the wet gas main flue 2, flows upward along the wet gas branch flue 8, passes through the water guide 3, and then enters the exchange through the wet gas channel 311. The thermal module 4 performs heat exchange and cooling to form low-temperature saturated high-humidity flue gas, which flows upwards and is discharged into the water collection and whitening tower 1 through the air inlet 12, and is discharged from the exhaust port 11 to the outside of the water collection and whitening tower 1. At this time, a negative pressure is formed in the top area of the water-receiving and whitening tower 1; the unsaturated high-humidity flue gas is condensed to a supersaturated state by the heat exchange module 4, and a large amount of water vapor in the flue gas condenses to form liquid water, which flows along the wet gas under the action of gravity. The channel 411 flows to the water guide 32, accumulates from the water guide 32 to the water receiving tank 33, and then is discharged from the drain port 34 for recycling; the inclined moisture channel 411 in the heat exchange module 4 can make the moisture flow and condensed water The water flow is layered up and down and flows in reverse, which effectively prevents the gas-liquid collision phenomenon.

2) Under the action of negative pressure in the water collection and whitening tower 1, the low-temperature ambient air passes through the air channel 421 from the water collecting and whitening tower 1 to form high-temperature air after heat exchange, and then enters the water collecting and whitening tower 1 and Flow upwards; since the unsaturated high-humidity flue gas carries a large amount of heat when passing through the moisture channel 311 of the heat exchange module 4, it continuously absorbs the heat exchange module 4 as the low-temperature ambient air flows upward, so that the temperature of the heat exchange air also continues to rise. The relative saturation of water vapor in the air keeps decreasing; the low-humidity and high-temperature ambient air that has completed the heat exchange enters the air inlet 12 through the air channel 421;

3) The low-temperature saturated high-humidity flue gas and high-temperature air in the water collection and whitening elimination tower 1 are quickly mixed evenly under the turbulence of the air mixing device 5, and the flue gas reaches an unsaturated state. The white tower 1 exhaust port 11 discharges, so as to realize no white smoke emission.

Step 1) Condensed water is formed when the unsaturated high-humidity flue gas passes through the wet gas channel 411 of the heat exchange module 4, and flows out along the bottom of the wet gas channel 411 under the action of gravity and falls into the water guide 32. The water guide tank 300 on the 301 accumulates and diverts the water and drains it to the water receiving tank 31 through the porous water guide plate 33, and discharges the water from the water receiving and whitening tower 1 through the drain port 34 for recycling, realizing the recovery of high-humidity flue gas water resources.

By setting the cleaning device 7 under the water guide 32, the water guide 32 is intermittently washed to prevent the dust particles in the flue gas from adhering to and blocking the water guide 32. The liquid-gas ratio of the cleaning water is 0.1L/Nm ³ -0.5 L/Nm ³ , the distance between the cleaning nozzle and the bottom of the water guide is 0.2m-0.7m. When the unsaturated high-humidity flue gas passes through the water guide 32, a small amount of particles in the flue gas will collide with each wave-shaped water guide blade 301 and be trapped. When the particles on the blades 301 accumulate to a certain thickness, it is easy to cause some areas inside the water guide 32 to be blocked, increasing the running resistance of the water guide 32 . When the resistance of the water guide 32 increases, the cleaning device 7 is turned on, the flushing water is atomized by the nozzle 71 through the external water supply pipe 72, and the water guide 21 is washed with the wet flue gas flow, and the surface of each wave-shaped water guide vane 301 is cleaned. The cleaned cleaning liquid and dust particles are diverted to the water receiving tank 31 by the corrugated water guide blades 301, and then discharged out of the water collecting and whitening tower 1 through the drain port 34 along with the condensate.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. The unsaturated high-humidity tail gas white smoke eliminating device comprises a water collecting white tower (1), wherein an outlet at the upper end of the water collecting white tower (1) is used as an exhaust port (11), and the lower end of the water collecting white tower (1) is used as an air inlet (12), and is characterized in that a plurality of heat exchange modules (4) are transversely distributed in the air inlet (12), a moisture main flue (2) is arranged below the water collecting white tower (1), a plurality of air channels (421) with lower ends communicated with the atmosphere and upper ends communicated with the air inlet (12) are obliquely arranged in the heat exchange modules (4), and a plurality of moisture channels (411) with upper ends communicated with the air inlet (12) and lower ends communicated with the moisture main flue (2) through moisture branch flues (8) are obliquely arranged in the heat exchange modules (4); a water collecting unit (3) is arranged in each moisture branch flue (8), and liquid water condensed by the moisture channel (411) is accumulated and recycled through the water collecting unit (3).

2. the unsaturated high-humidity tail gas white smoke elimination device according to claim 1, wherein each heat exchange module (4) comprises a plurality of first heat exchange plates (41) and a plurality of second heat exchange plates (42) which are stacked up and down at intervals, each first heat exchange plate (41) and each second heat exchange plate (42) are respectively provided with a plurality of channels in a transverse parallel manner, each channel of the first heat exchange plate (41) is used as a moisture channel (411), each channel of the adjacent second heat exchange plate (42) is used as an air channel (421), and each moisture channel (411) in each first heat exchange plate (41) and each air channel (421) in each second heat exchange plate (42) are crossed.

3. The unsaturated high-humidity tail gas white smoke elimination device according to claim 1 or 2, characterized in that each heat exchange module (4) is horizontally and sequentially grouped in pairs, the two grouped heat exchange modules (4) are distributed in a V shape, the included angle a between the two heat exchange modules is 34-106 degrees, the lower ends of the moisture channels (411) of the two heat exchange modules (4) are obliquely and inwardly communicated and connected with the moisture main flue (2) through the same moisture branch flue (8), and the upper ends of the moisture channels are obliquely and outwardly communicated with the air inlet (12); the heat exchange modules (4) are connected in a sealing mode, and the length ratio of the moisture channel (411) to the air channel (421) is 1:1-5: 1.

4. the unsaturated high-humidity tail gas white smoke abatement device according to claim 1, wherein the water collection unit (3) comprises a water collection tank (31) and a water guider (32), the water collection tank (31) is welded on the side walls of the two sides of the moisture branch flue (8) and forms a cavity with an upper opening with the side walls of the moisture branch flue (8), a porous plate (33) is respectively arranged above the water collection tank (31), a water outlet (34) communicated with the water collection tank (31) is arranged outside the moisture branch flue (8), two sides of the water guider (32) are respectively connected with the porous plate (33) and are erected at the upper side between the two side water collection tanks (31), the moisture in the moisture main flue (2) passes through the moisture branch flue (8) and then enters the air inlet (12) through the moisture channels (411) after passing through the water guider (32), and liquid water generated after condensation of the moisture channels (411) flows to the porous plate (33) through the water guider (32), the water is collected and guided to the water collecting tank (31) by the porous plate (33) and is discharged and recycled by the water outlet (34).

5. The white smoke abatement device for unsaturated high humidity tail gas according to claim 3, wherein a cleaning device (7) for cleaning the water deflector is arranged below the water deflector (32), the cleaning device (7) comprises a plurality of nozzles (71) facing the water deflector module and an external water supply pipe (72) for supplying water to the nozzles (71); the water distributor (32) comprises two groups of water distribution modules (30) distributed in a herringbone manner, each water distribution module (30) comprises a plurality of wave-shaped water distribution blades (301) distributed in a row transversely, and a liquid receiving baffle (302) is arranged on one wave-shaped water distribution blade (301) between adjacent wave-shaped water distribution blades (301); the oblique outer side of a water chute (300) formed by each liquid receiving baffle plate (302) and the side wave-shaped water guide blade (301) is connected with a porous plate (33); liquid water generated after the moisture channel (411) is condensed flows to the porous plate (33) through the water guide groove (300), and is accumulated and guided to the water collecting groove (31) by the porous plate (33).

6. The unsaturated high-humidity tail gas white smoke eliminating device according to claim 1, wherein an air mixing device (5) is arranged between the heat exchange module (4) and the exhaust port (11) in the water collecting and white smoke eliminating tower (1), mix wind device (5) and include baffle (51) and a plurality of whirl turbine (50), baffle (51) week side encapsulation is in receiving water white tower (1) that disappears, be provided with a plurality of mounting holes (510) on baffle (51), be provided with whirl turbine (50) in each mounting hole (510) respectively, each whirl turbine (50) includes a plurality of turbine blade (501) respectively, fixed cover (500) and central shaft (502), central shaft (502) set up in fixed cover (500) axial direction center, a plurality of turbine blade (501) radial distribution is between fixed cover (500) and central shaft (502), each fixed cover (500) radial outside is connected with each mounting hole (510).

7. The unsaturated high-humidity tail gas white smoke elimination device according to claim 4, wherein the height h of the water deflector (32) is 0.5-1.2 m, the thickness of the water deflector blades (301) is 0.5-3 mm, the distance T between adjacent water deflector blades (301) is 10-35 mm, and the included angle beta between the water deflector modules (30) which are distributed in a herringbone shape at two sides is 34-106 degrees.

8. A method for eliminating white smoke by using the unsaturated high humidity exhaust white smoke eliminating device according to any one of claims 1 to 7, comprising the steps of:

1) The unsaturated high-humidity flue gas is shunted to each moisture branch flue (8) through the moisture main flue (2), flows upwards along the moisture branch flue (8), passes through the water guider (3), enters the heat exchange module (4) through the moisture channel (311) for heat exchange and cooling to form low-temperature saturated high-humidity flue gas, flows upwards, is discharged into the water-receiving and water-removing tower (1) through the air inlet (12), is discharged out of the water-receiving and water-removing tower (1) through the air outlet (11), and at the moment, negative pressure is formed in the top area of the water-receiving and water-removing tower (1); unsaturated high-humidity flue gas is condensed to a supersaturated state by the heat exchange module (4), a large amount of water vapor in the flue gas is condensed to generate liquid water, the liquid water is accumulated to the water receiving tank (33) by the water guider (32), and then the liquid water is discharged from the water outlet (34) for recycling;

2) Under the action of negative pressure in the water-receiving and air-removing tower (1), low-temperature environment air is subjected to heat exchange and temperature rise through an air channel (421) from the outside of the water-receiving and air-removing tower (1) to form high-temperature air, and the high-temperature air enters the water-receiving and air-removing tower (1) and flows upwards;

3) The low-temperature saturated high-humidity flue gas and the high-temperature air in the water and white water collecting and eliminating tower (1) are quickly and uniformly mixed under the turbulent flow effect of the air mixing device (5), the flue gas reaches an unsaturated state, and the unsaturated flue gas after mixing is discharged without white smoke through the exhaust port (11) of the water and white water collecting and eliminating tower (1).

9. The white smoke abatement method according to claim 8, wherein in the step (1)), condensed water is formed when the unsaturated high humidity flue gas passes through the moisture channel (411) of the heat exchange module (4), and flows out along the bottom of the moisture channel (411) under the action of gravity and falls into the water deflector (32), and is accumulated and guided by the water guide grooves (300) on the wave-shaped water guide blades (301), and is guided to the water collection groove (31) through the porous water guide plate (33), and is discharged out of the water collection white tower (1) through the water discharge opening (34) for recycling, so that the water resource recovery of the high humidity flue gas is realized.

10. The white smoke abatement method according to claim 8, wherein the water deflector (32) is intermittently washed by arranging a cleaning device (7) below the water deflector (32) to prevent dust particles in the smoke from adhering to and blocking the water deflector (32), and the cleaning water-liquid-gas ratio is 0.1L/Nm³-0.5L/Nm³the distance between the cleaning nozzle and the bottom of the water deflector is 0.2m-0.7 m.