CN110567290B

CN110567290B - Unsaturated high-humidity tail gas white smoke eliminating device and method

Info

Publication number: CN110567290B
Application number: CN201910976411.7A
Authority: CN
Inventors: 程常杰; 吴国良; 张银海
Original assignee: Hangzhou Yunze Environmental Technology Co ltd
Current assignee: Hangzhou Yunze Environmental Technology Co ltd
Priority date: 2019-10-15
Filing date: 2019-10-15
Publication date: 2024-04-02
Anticipated expiration: 2039-10-15
Also published as: CN110567290A

Abstract

The invention discloses a device and method for eliminating white smoke from unsaturated high-humidity exhaust gas. The device includes a water collection and white smoke elimination tower. The upper end of the water collection and white smoke elimination tower is an exhaust port, and the lower end of the water collection and white smoke elimination tower is an air inlet. There are several heat exchange modules arranged horizontally in the air inlet. There is a main moisture flue below the water collection and whitening tower. There are several air channels diagonally arranged in the heat exchange module with the lower end connected to the atmosphere and the upper end connected to the air inlet. And there are a number of moisture channels diagonally provided with upper ends connected to the air inlet and lower ends connected to the main moisture flue through the moisture branch flue; a water collection unit is provided in each moisture branch flue. The 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 costs of high-humidity flue gas treatment devices.

Description

Unsaturated high-humidity tail gas white smoke eliminating device and method

Technical Field

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

Background

In the industrial production process, intermediate products in a large number of production processes are in a wet state or have high water content, while products entering a next process are required to be in a dry state, and in order to ensure continuous production, the intermediate products in the wet state or have high water content are often required to be dried, so that the production efficiency is improved. The material drying mainly utilizes a heat source to heat the wet material, and evaporates moisture in the material into gaseous water to be discharged, so that the drying treatment of the material is realized. Part of the hot air is fed into the drying device to contact with the materials in the industrial material drying process, the moisture evaporation rate is improved by utilizing the hot air flow, the drying time can be greatly reduced, and the volume and the investment running cost of the drying device are reduced, so that the drying process is widely applied in the industrial production process.

After the drying is finished, the mixture of steam and hot air in the materials forms drying tail gas, the drying tail gas is unsaturated high-humidity flue gas, the exhaust temperature is generally 50-90 ℃, the relative saturation of the steam is as high as 70-95%, and a small amount of fine material particle dust and the like are also present in the drying tail gas according to different material properties.

The unsaturated high-humidity drying tail gas is discharged into the atmosphere along with an exhaust system, and after the unsaturated high-humidity drying tail gas is in contact heat exchange with low-temperature ambient air, the temperature of the flue gas is quickly condensed and reduced to a supersaturated state, a large amount of water vapor is condensed into fine fog drops, and an obvious white flue tail fin is formed near a smoke outlet, so that serious visual pollution is caused. The enterprises with a large number of drying devices are often distributed in densely populated industrial factories and urban suburban areas, white smoke formed by high-humidity tail gas in a region near a smoke outlet is greatly affected by density and is difficult to diffuse in a low-temperature static wind environment in winter, and condensed water drops suspended in air are continuously enriched near a discharge region, so that the relative humidity of ambient air is greatly increased; under the environment of higher humidity, the residual gaseous pollutants in the air are very easy to take suspension liquid drops as carriers to carry out complex physicochemical reactions to generate ultrafine particles, so that the formation of regional haze weather is promoted, and the production, life and physical health of people are seriously influenced. Meanwhile, a large amount of unrecoverable gaseous moisture is discharged into the environment from unsaturated high-humidity drying tail gas, so that industrial enterprises have large water consumption and high water consumption cost.

At present, for the saturated or supersaturated high-humidity tail gas white smoke treatment, a direct heating method, a wind mixing method, a condensation reheating method and the like are mainly used. Both the direct heating method and the condensation reheating method need an external heat source to heat the high-humidity flue gas, reduce the humidity of the flue gas and eliminate white smoke, and need a large amount of external heat sources. The increased heat source of the heating method white smoke eliminating technology needs to be provided by increasing the amount of fire coal, the energy consumption of the system operation is higher, and the newly increased amount of fire coal can also increase the pollutant emission. The air mixing method is to mix a large amount of ambient air with high-humidity smoke, and then reduce the mixed smoke below saturated humidity to realize unsaturated emission of the smoke, thereby eliminating white smoke; the air mixing device is influenced by the ambient temperature, a large amount of ambient air is often required to be mixed with the desulfurization saturated wet flue gas, the occupied area of the air mixing device is large, and the running energy consumption of the air mixing fan is high. The unsaturated high-humidity flue gas, especially the drying high-humidity tail gas, has the characteristics of small flue gas amount (the flue gas amount of the general drying process is less than 200000Nm 3/h), high flue gas temperature (the exhaust temperature of most of the drying tail gas is 50-100 ℃), high humidity and the like, and is not suitable for the existing white removing process with high investment cost, high energy consumption and large occupied area. Therefore, aiming at unsaturated, high-humidity and low-gas-quantity flue gas such as drying tail gas, a white smoke eliminating technology which is obvious in white smoke eliminating effect, low in energy consumption, small in occupied area, objective in water yield and stable in operation and is matched with the unsaturated, high-humidity and low-gas-quantity flue gas such as the drying tail gas needs to be developed, and at present, the white smoke eliminating technology aiming at the unsaturated, high-humidity tail gas such as the drying tail gas is still blank.

Disclosure of Invention

The invention aims to solve the technical problems by providing an unsaturated high-humidity tail gas white smoke eliminating device and method, which are characterized in that unsaturated high-humidity smoke and ambient air are respectively led into a heat exchange module filler with a plurality of layers of cross flow channels for condensation heat exchange, most of water vapor in the unsaturated smoke is condensed into liquid water for recovery, and the low-temperature saturated smoke and the high-temperature ambient air after heat exchange are mixed to be unsaturated and discharged through an exhaust port, so that the unsaturated high-humidity smoke is free from white smoke discharge, the condensed and recovered water is recycled through a liquid collecting unit, and the running cost of a system is reduced.

The invention provides an unsaturated high-humidity tail gas white smoke eliminating device, which comprises a water collecting white tower, wherein an outlet at the upper end of the water collecting white tower is used as an exhaust port, the lower end of the water collecting white tower is used as an air inlet, a plurality of heat exchange modules are transversely arranged in the air inlet, a wet gas main flue is arranged below the water collecting white tower, a plurality of air channels with the lower end communicated with the atmosphere and the upper end communicated with the air inlet are obliquely arranged in the heat exchange modules, and a plurality of wet gas channels with the upper end communicated with the air inlet and the lower end communicated with the wet gas main flue through wet gas branch flues are obliquely arranged in the heat exchange modules; and each wet gas branch flue is internally provided with a water receiving unit, and liquid water condensed by the wet gas channel is accumulated and recycled through the water receiving unit.

Further, each heat exchange module comprises a plurality of first heat exchange plates and second heat exchange plates which are stacked up and down at intervals, and each first heat exchange plate and each second heat exchange plate are respectively and transversely provided with a plurality of channels in parallel, wherein each channel of the first heat exchange 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 and each air channel in each second heat exchange plate are crisscrossed.

Further, each heat exchange module is transversely and sequentially grouped in pairs, the two groups of heat exchange modules are distributed in a V shape, the included angle a between the two groups of heat exchange modules is 34-106 degrees, the lower ends of the moisture channels 411 of the two groups of heat exchange modules are obliquely and internally uniformly communicated and connected with the moisture main flue 2 by the same moisture branch flue 8, and the upper ends of the moisture channels are obliquely and externally communicated with the air inlets 12 respectively; the heat exchange modules are respectively connected in a sealing way, and the length ratio of the moisture channel to the air channel is 1:1-5:1.

Further, the water receiving unit comprises a water receiving tank and a water guide device, wherein the water receiving tank is welded on the side walls of the two sides of the wet gas branch flue and forms a cavity with an opening at the upper part with the side walls of the wet gas branch flue, a porous plate is arranged above the water receiving tank respectively, a water outlet communicated with the water receiving tank is arranged outside the wet gas branch flue, the two sides of the water guide device are respectively connected with the porous plate and are arranged at the upper side between the water receiving tanks at the two sides, wet flue gas in the wet gas main flue passes through the water guide device and then enters the air inlet 12 through each wet gas channel, liquid water generated after the wet gas channel 411 is condensed flows to the porous plate through the water guide device, is accumulated and guided to the water receiving tank through the porous plate, and is discharged and recycled through the water outlet.

Further, a cleaning device for cleaning the water guide is arranged below the water guide, and comprises a plurality of nozzles facing the water guide module and an external water supply pipe for supplying water to the nozzles; the water guide device comprises two groups of water guide modules which are distributed in a herringbone manner, each water guide module comprises a plurality of waveform water guide blades which are distributed in a transverse row manner, and a liquid receiving baffle is arranged on one side of each waveform water guide blade between adjacent waveform water guide blades; each liquid receiving baffle plate is connected with the perforated plate at the inclined outer side of the water guide groove formed by the side wave-shaped water guide blades; the liquid water generated after the condensation of the wet gas channel flows through the water guide groove and flows into the porous plate, and is accumulated and guided into the water receiving groove by the porous plate.

Further, a wind mixing device is arranged between the heat exchange module and the exhaust port in the water receiving and white removing tower, the wind mixing device comprises a partition plate and a plurality of cyclone turbines, the periphery of the partition plate is packaged in the water receiving and white removing tower, a plurality of mounting holes are formed in the partition plate, cyclone turbines are respectively arranged in the mounting holes, each cyclone turbine comprises a plurality of turbine blades, a fixing sleeve and a central shaft, the central shaft is arranged at the axial center of the fixing sleeve, the turbine blades are radially distributed between the fixing sleeve and the central shaft, and the radial outer side of each fixing sleeve is connected with each mounting hole.

Further, the height h of the water guide device is 0.5m-1.2m, the thickness of the water guide blades is 0.5mm-3mm, the distance T between adjacent water guide blades is 10mm-35mm, and the included angle beta between the water guide modules distributed in a herringbone shape on two sides is 34-106 degrees.

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

1) The unsaturated high-humidity flue gas is shunted to each wet branch flue through the wet main flue, flows upwards along the wet branch flue and passes through the water guide, then enters the heat exchange module through the wet channel to exchange heat and cool to form low-temperature saturated high-humidity flue gas, flows upwards and is discharged into the water-collecting and white-removing tower through the air inlet, is discharged to the outside of the water-collecting and white-removing tower through the air outlet, and at the moment, the top area of the water-collecting and white-removing tower forms negative pressure; the unsaturated high-humidity flue gas is condensed to a supersaturated state by a heat exchange module, a large amount of water vapor in the flue gas is condensed to generate liquid water which is accumulated to a water receiving tank by a water guide device,

then the waste water is discharged from the water outlet for recycling;

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

3) The low-temperature saturated high-humidity smoke and high-temperature air in the water-collecting and white-removing tower are rapidly and uniformly mixed under the turbulent flow effect of the air mixing device, the smoke reaches an unsaturated state, and the mixed unsaturated smoke is discharged from an exhaust port of the water-collecting and white-removing tower without white smoke.

Further, the unsaturated high-humidity flue gas in the step 1) forms condensation water when passing through a moisture channel of the heat exchange module, flows out along the bottom of the moisture channel under the action of gravity and falls into a water guide device, is accumulated and guided by a water guide groove between water guide blades and is guided to a water receiving groove through a porous water guide plate, and is discharged from a water outlet to be recycled outside a water receiving and white tower, so that the high-humidity flue gas water resource is recycled.

Further, by arranging the cleaning device below the water guide, intermittent flushing is carried out on the water guide, dust particles in the flue gas are prevented from adhering to and blocking the water guide, the liquid-gas ratio of cleaning water is 0.1L/Nm3-0.5L/Nm3, and 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 eliminating device and method provided by the invention have the advantages that the heat exchange module with the multi-layer cross flow channels is adopted to carry out cross flow indirect heat exchange on the unsaturated high-humidity smoke and the ambient air, so that the heat exchange area of the wet smoke and the ambient air is greatly increased, the unsaturated wet smoke is promoted to be quickly condensed, the condensed water is effectively recovered through the water receiving unit, and the running cost of the high-humidity smoke treatment device is reduced;

the unsaturated high-humidity flue gas is condensed to recover most of moisture in the flue gas, so that the water vapor content in the flue gas is reduced, the self-pulling force generated in the flue gas discharging process is used as a power source to mix air to reduce the flue gas humidity, other heat sources are not required to be added in the flue gas reheating process in the whitening process, the air mixing quantity can be reduced, and the energy consumption in the flue gas whitening process is low;

the moisture channels and the air channels of the heat exchange module are crossed in a cross lamination manner and are obliquely arranged, so that the condensation process is promoted to generate downward condensation water and upward wet flue gas to flow in a layered manner, and the resistance of the system is reduced; the cleaning device is arranged below the water guide device to intermittently flush the water guide device, so that dust particles in the flue gas are prevented from adhering to and blocking the water guide device, and the operation stability of the system is greatly improved;

the unsaturated high-humidity flue gas forms condensation water when passing through the moisture channel of the heat exchange module, flows out along the bottom of the moisture channel under the action of gravity and falls into the water guide device, is accumulated and guided by the water guide grooves among the water guide blades and is guided to the water receiving groove through the porous water guide plates, and is discharged from the water receiving and white tower to be recycled by the water outlet, so that the high-humidity flue gas water resource recovery is realized.

Drawings

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

FIG. 2 is a schematic view of the installation structure of two heat exchange modules and wet gas branch flues after two heat exchange modules are grouped;

fig. 3 is a schematic view of the structure of the 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 an assembled schematic view of the first heat exchange plate and the second heat exchange plate 42 of FIG. 3 stacked at intervals;

FIG. 7 is an enlarged schematic view of the mounting structure of the water receiver and the wet gas branch flue;

fig. 8 is a schematic layout view 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 perspective view of the knob turbine of fig. 9.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Example 1: referring to fig. 1 to 9, the unsaturated high-humidity tail gas white smoke eliminating device of the present invention includes a water collecting white tower 1, an outlet at an upper end of the water collecting white tower 1 is used as an exhaust port 11, a lower end of the water collecting white tower 1 is used as an air inlet 12, a plurality of heat exchange modules 4 are transversely arranged in the air inlet 12, a humidity 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 humidity channels 411 with upper ends communicated with the air inlet 12 and lower ends communicated with the humidity main flue 2 through humidity branch flues 8 are obliquely arranged in the heat exchange modules 4; a water receiving unit 3 is arranged in each wet gas branch flue 8, and liquid water condensed by the wet gas channel 411 is accumulated and recycled through the water receiving unit 3. Each wet gas branch flue 8 is vertically arranged and communicated with the wet gas main flue 2, and the peripheral side of the upper end of the wet gas branch flue is in sealing connection with the peripheral side of the wet gas channel 411 communicated with the same side of the heat exchange module 4, so that wet gas flows and leakage is avoided.

Each heat exchange module 4 comprises a plurality of first heat exchange plates 41 and second heat exchange plates 42 which are stacked up and down at intervals, and each first heat exchange plate 41 and each second heat exchange plate 42 are respectively and transversely provided with a plurality of channels in parallel, wherein 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 crisscrossed.

The heat exchange modules 4 are transversely and sequentially grouped in pairs, the two groups of heat exchange modules 4 are distributed in a V shape, the included angle a between the two groups of heat exchange modules is 34-106 degrees, the lower ends of the moisture channels 411 of the two groups of heat exchange modules 4 are obliquely and internally uniformly communicated and connected with the moisture main flue 2 by the same moisture branch flue 8, and the upper ends of the moisture channels are obliquely and externally communicated with the air inlets 12 respectively; the heat exchange modules 4 are respectively connected in a sealing way, and the length ratio of the moisture channel 411 to the air channel 421 is 1:1-5:1.

The water receiving unit 3 comprises a water receiving tank 31 and a water guide 32, the water receiving tank 31 is welded on the side walls of the two sides of the wet gas branch flue 8 and forms a cavity with an opening at the upper part with the side walls of the wet gas branch flue 8, a porous plate 33 is arranged above the water receiving tank 31, a water outlet 34 communicated with the water receiving tank 31 is arranged outside the wet gas branch flue 8, the two sides of the water guide 32 are respectively connected with the porous plate 33 and are arranged at the upper side between the water receiving tanks 31 at the two sides, wet flue gas in the wet gas main flue 2 passes through the wet gas branch flue 8 and then passes through the water guide 32 to enter the air inlet 12 through each wet gas channel 411, liquid water generated after the condensation of the wet gas channels 411 flows through the porous plate 33, is accumulated and guided into the water receiving tank 31 through the porous plate 33, and is discharged and recycled through the water outlet 34, namely the water guide 32 can realize the through-up flow of air flow, and the water flow is accumulated along the water guide 32 to the water receiving tank 31 on the side walls of the wet gas branch flue 8 through the porous plate 33 through the water guide 32. An inward inclined water baffle 311 is arranged on the inward opening edge of the water receiving tank 31.

A cleaning device 7 for cleaning the water guide is arranged below the water guide 32, and the cleaning device 7 comprises a plurality of nozzles 71 facing the water guide module and an external water supply pipe 72 for supplying water to the nozzles 71; the water guide 32 comprises two groups of water guide modules 30 distributed in a herringbone manner, each water guide module 30 comprises a plurality of waveform water guide blades 301 distributed in a transverse row, and a liquid receiving baffle 302 is arranged on one side of each waveform water guide blade 301 between adjacent waveform water guide blades 301; the inclined outer side of the water guide groove 300 formed by each liquid receiving baffle piece 302 and the side wave-shaped water guide blade 301 is connected with the porous plate 33; the liquid water generated by condensation of the wet gas channel 411 flows through the water guiding groove 300 to the porous plate 33, and is accumulated and guided into the water receiving groove 31 by the porous plate 33.

As shown in fig. 9 and 10, a wind mixing device 5 is disposed between the heat exchange module 4 and the exhaust port 11 in the water collecting and white tower 1, the wind mixing device 5 includes a partition plate 51 and a plurality of swirl turbines 50, the periphery of the partition plate 51 is encapsulated in the water collecting and white tower 1, a plurality of mounting holes 510 are formed in the partition plate 51, the swirl turbines 50 are respectively disposed in the mounting holes 510, each swirl turbine 50 includes a plurality of turbine blades 501, a fixing sleeve 500 and a central shaft 502, the central shaft 502 is disposed at the axial center of the fixing sleeve 500, the turbine blades 501 are radially distributed between the fixing sleeve 500 and the central shaft 502, and the radially outer side of each fixing sleeve 500 is connected with each mounting hole 510. The low-temperature saturated high-humidity flue gas and the high-temperature air below the partition plate 51 form vortex after passing through the air mixing device 5, so that the low-temperature saturated high-humidity flue gas and the high-temperature air are mixed and discharged above the partition plate 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 wave-shaped water guide blades 301 is 0.5mm-3mm, the interval T between adjacent wave-shaped water guide blades 301 is 10mm-35mm, and the included angle beta between the water guide modules 30 distributed in a herringbone shape on two sides is 34-106 degrees.

Example 2: referring to fig. 1 to 10, based on embodiment 1, a method for eliminating white smoke from unsaturated high-humidity tail gas includes the following steps:

1) The unsaturated high-humidity flue gas is split into each wet branch flue 8 through the wet main flue 2, flows upwards along the wet branch flue 8 and passes through the water guide 32, then enters the heat exchange module 4 through the wet channel 411 to exchange heat and cool to form low-temperature saturated high-humidity flue gas, flows upwards and is discharged into the water receiving and white removing tower 1 through the air inlet 12, is discharged out of the water receiving and white removing tower 1 through the air outlet 11, and at the moment, the top area of the water receiving and white removing tower 1 forms negative pressure; the 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 flows onto the water guide 32 along the moisture channel 411 under the action of gravity, is accumulated to the water receiving tank 31 by the water guide 32, and is discharged from the water outlet 34 for recycling; the moisture channel 411 which is obliquely arranged in the heat exchange module 4 can enable the moisture airflow and the condensed water flow to be layered up and down and flow reversely, so that the gas-liquid collision phenomenon is effectively prevented.

2) Under the action of negative pressure in the water receiving and whitening tower 1, low-temperature ambient air is subjected to heat exchange and temperature rise through an air channel 421 from outside the water receiving and whitening tower 1 to form high-temperature air, and the high-temperature air enters the water receiving and whitening tower 1 and flows upwards; because the unsaturated high-humidity flue gas carries a large amount of heat when passing through the moisture channel 411 of the heat exchange module 4, the temperature of the heat exchange air is increased continuously as the low-temperature ambient air flows upwards to continuously absorb the heat exchange module 4, and the relative saturation of water vapor in the air is reduced continuously; the low-humidity high-temperature ambient air with heat exchange completed enters the air inlet 12 through the air channel 421;

3) The low-temperature saturated high-humidity smoke and high-temperature air in the water-receiving and white-removing tower 1 are rapidly and uniformly mixed under the turbulent flow effect of the air mixing device 5, the smoke reaches an unsaturated state, and the mixed unsaturated smoke is discharged from the exhaust port 11 of the water-receiving and white-removing tower 1, so that white smoke-free discharge is realized.

Step 1) the unsaturated high-humidity flue gas forms condensation water when passing through the moisture channel 411 of the heat exchange module 4, flows out along the bottom of the moisture channel 411 under the action of gravity and falls into the water guide 32, is accumulated and guided by the water guide grooves 300 on each wave-shaped water guide blade 301 and is guided to the water receiving groove 31 through the porous plate 33, is discharged out of the water receiving and whitening tower 1 through the water outlet 34 for recycling, and realizes the recycling of high-humidity flue gas water resources.

By arranging the cleaning device 7 below the water guide 32, intermittent flushing is carried out on the water guide 32, dust particles in the flue gas are prevented from adhering to and blocking the water guide 32, the liquid-gas ratio of cleaning water is 0.1L/Nm3-0.5L/Nm3, and 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 collide with each waveform water guide blade 301 and are trapped, and as the operation time of the white smoke eliminating device is prolonged, partial areas inside the water guide 32 are easily blocked when the particles on each waveform water guide blade 301 are accumulated to a certain thickness, so that the operation resistance of the water guide 32 is increased. When the resistance of the water guide 32 increases, the cleaning device 7 is started, the cleaning water is atomized by the nozzle 71 through the external water supply pipe 72 and washes the water guide 21 along with the wet flue gas flow, the surface of each waveform water guide blade 301 is cleaned, the cleaning liquid and dust particles which are cleaned are guided to the water receiving groove 31 by each waveform water guide blade 301, and the cleaning liquid and dust particles are discharged out of the water receiving and whitening tower 1 along with condensate through the water outlet 34.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. A device for eliminating white smoke from unsaturated high-humidity tail gas, including a water collection and white smoke elimination tower (1), the upper outlet of the water collection and white smoke elimination tower (1) serves as the exhaust port (11), and the water collection and white smoke elimination tower (1) The lower end serves as the air inlet (12), which is characterized in that a number of heat exchange modules (4) are arranged horizontally in the air inlet (12), and a main moisture flue (2) is provided below the water collection and whitening tower (1). ), the heat exchange module (4) is provided with a number of air channels (421) with lower ends connected to the atmosphere and upper ends connected with the air inlets (12), and several upper ends connected with the air inlets (12). ) is connected, and the lower end is connected to the main moisture flue (2) through the moisture branch flue (8);

Each moisture branch flue (8) is provided with a water collection unit (3), and the liquid water condensed in the moisture channel (411) is accumulated and recycled through the water collection unit (3);

Each heat exchange module (4) comprises a plurality of first heat exchange plates (41) and second heat exchange plates (42) stacked in an upper and lower spaced relationship, each first heat exchange plate (41) and each second heat exchange plate (42) are respectively provided with a plurality of channels arranged in parallel in a transverse manner, wherein 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) is connected to each second heat exchange plate (42)

The air channels (421) in the heat exchange plate (42) are arranged in a cross shape;

An air mixing device (5) is arranged between a heat exchange module (4) and an exhaust port (11) in a water collecting and deoxidizing tower (1). The air mixing device (5) comprises a partition (51) and a plurality of swirl turbines (50). The circumferential side of the partition (51) is encapsulated in the water collecting and deoxidizing tower (1). A plurality of mounting holes (510) are arranged on the partition (51). A swirl turbine (50) is arranged in each mounting hole (510). Each swirl turbine (50) comprises a plurality of turbine blades (501), a fixing sleeve (500) and a central shaft (502). The central shaft (502) is arranged at the axial center of the fixing sleeve (500). The plurality of turbine blades (501) are radially distributed between the fixing sleeve (500) and the central shaft (502). The radial outer side of each fixing sleeve (500) is connected to each mounting hole (510).

2. The device for eliminating white smoke from unsaturated high-humidity tail gas as claimed in claim 1, characterized in that each heat exchange module (4) is grouped into two groups laterally, and the two groups of heat exchange modules (4) are V-shaped. type distribution, the angle a between them is 34°-106°, and the lower ends of each moisture channel (411) of the two sets of heat exchange modules (4) are unified diagonally inward by the same moisture branch flue (8 ) is connected to the main moisture flue (2), and its upper end is diagonally outwardly connected to the air inlet (12); each heat exchange module (4) is sealed and connected respectively, and the moisture channel (411) is connected to the air channel The length ratio of (421) is 1:1-5:1.

3. The unsaturated high-humidity tail gas white smoke elimination device according to claim 1, characterized in that the water collection unit (3) includes a water collection channel (31), a water guide (32), and a water collection channel (31). Welded to the two side walls of the moisture branch flue (8), and with the side walls of the moisture branch flue (8), they form a cavity with an upper opening, and porous plates (33) are respectively provided above the water collection channels (31). ), there is a drainage outlet (34) connected to the water collection tank (31) outside the moisture branch flue (8), and both sides of the water guide (32) are connected to the porous plates (33) and placed on both sides. On the upper side between the water tanks (31), the moist flue gas in the main moisture flue (2) passes through the moisture branch flue (8), passes through the water guide (32), and then enters through each moisture channel (411) The liquid water generated after condensation in the air inlet (12) and the moisture channel (411) flows to the porous plate (33) through the water guide (32), and is accumulated and guided by the porous plate (33) to the water collection tank (31) , and be discharged for recycling through the drain port (34).

4. The device for eliminating white smoke from unsaturated high-humidity exhaust gas as claimed in claim 3, characterized in that a cleaning device (7) for cleaning the water guide (32) is provided below the water guide (32), and the cleaning device (7) ) includes a number of nozzles (71) facing the water guide modules and external water supply pipes (72) supplying water to the nozzles (71); the water guides (32) each include two groups of water guide modules (30) distributed in a herringbone shape. , each water-guiding module (30) includes a number of corrugated water-guiding blades (301) distributed laterally in rows, and a connection is provided on one side of the adjacent corrugated water-guiding blades (301) between each corrugated water-guiding blade (301). Liquid baffle (302); the water guide channel (300) formed by each liquid baffle (302) and the corrugated water guide blade (301) on that side is connected obliquely to the outside with the porous plate (33); the moisture channel (411) condenses The liquid water produced then flows to the perforated plate (33) through the water conduit (300), and is accumulated and guided by the perforated plate (33) to the water collecting channel (31).

5. The unsaturated high-humidity tail gas white smoke elimination device according to claim 4, characterized in that the height h of the water guide (32) is 0.5m-1.2m, and the thickness of the corrugated water guide blade (301) is 0.5mm- 3mm, the spacing T between adjacent corrugated water guide blades (301) is 10mm-35mm, and the angle β between the water guide modules (30) distributed in a herringbone shape on both sides is 34°-106°.

6. A white smoke elimination method using the unsaturated high-humidity tail gas white smoke elimination device as claimed in claim 5, characterized in that it includes the following steps:

1) The 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) and passes through the water guide (32), and then enters the heat exchange module (4) through the wet gas channel (411) for heat exchange and cooling to form low-temperature saturated high-humidity flue gas, and flows upward through the air inlet (12) and is discharged into the water collecting and dehumidifying tower (1), and is discharged from the exhaust port (11) to the outside of the water collecting and dehumidifying tower (1), at which time a negative pressure is formed in the top area of the water collecting and dehumidifying tower (1); the unsaturated high-humidity flue gas is condensed to an oversaturated state by the heat exchange module (4), and a large amount of water vapor in the flue gas condenses to generate liquid water, which is accumulated in the water collecting tank (31) by the water guide (32), and then discharged from the drain port (34) for recycling;

2) Under the effect of negative pressure in the water collecting and deoxidizing tower (1), the low-temperature ambient air is heated through the air passage (421) outside the water collecting and deoxidizing tower (1) to form high-temperature air, and then enters the water collecting and deoxidizing tower (1) and flows upward;

3) The low-temperature, saturated, high-humidity flue gas and high-temperature air in the water collection and whitening tower (1) are rapidly mixed evenly under the turbulence of the air mixing device (5). The flue gas reaches an unsaturated state, and the mixed unsaturated flue gas is completed. The exhaust port (11) of the water collection and white elimination tower (1) achieves no white smoke emission.

7. The white smoke elimination method according to claim 6, characterized in that, in step (1), when the unsaturated high-humidity flue gas passes through the moisture channel (411) of the heat exchange module (4), condensed water is formed, and condensed water is formed under the influence of gravity. Under the action of the action, the water flows out along the bottom of the moisture channel (411) and falls into the water guide (32). It is accumulated and guided by the water guide grooves (300) on each wave-shaped water guide blade (301) through the porous plate (33) to the collection point. The water tank (31) is discharged from the drainage port (34) to collect water and recycle it outside the whitewashing tower (1) to realize the recovery of high-humidity flue gas water resources.

8. The method for eliminating white smoke as claimed in claim 7, characterized in that a cleaning device (7) is provided below the water guide (32) to perform intermittent flushing of the water guide (32) to prevent Dust particles adhere and block the water guide (32). The liquid-to-gas ratio of cleaning water is 0.1L/Nm3-

0.5L/Nm3, the distance between the cleaning nozzle and the bottom of the water guide is 0.2m-0.7m.