阅读说明：本技术 一种非饱和高湿尾气消白烟装置及方法 (Device and method for eliminating white smoke from unsaturated high-humidity tail gas ) 是由 程常杰 吴国良 张银海 于 2019-10-15 设计创作，主要内容包括：本发明公开了一种非饱和高湿尾气消白烟装置及方法,所述装置包括收水消白塔,收水消白塔上端为排气口,收水消白塔下端为进气口,进气口内横向排布有若干换热模块,收水消白塔下方设有湿气主烟道,换热模块内斜向设置有若干下端与大气连通、上端与进气口连通的空气通道,以及斜向设置有若干上端与进气口连通、下端通过湿气支烟道与湿气主烟道连通的湿气通道；各湿气支烟道内设置有收水单元。本发明其采用具有多层错流通道的换热模块将非饱和高湿烟气与环境空气进行错流间接换热,大幅提高湿烟气与环境空气的换热面积,促进非饱和湿烟气快速冷凝,并通过收水单元实现冷凝水的高效回收,降低了高湿烟气处理装置的运行成本。(The invention discloses a device and a method for removing white smoke from unsaturated high-humidity tail gas, wherein the device comprises a water-receiving and white-smoke removing tower, the upper end of the water-receiving and white-smoke removing tower is an exhaust port, the lower end of the water-receiving and white-smoke removing tower is an air inlet, a plurality of heat exchange modules are transversely arranged in the air inlet, a moisture main flue is arranged below the water-receiving and white-smoke removing tower, a plurality of air channels with the lower ends communicated with the atmosphere and the upper ends communicated with the air inlet are obliquely arranged in the heat exchange modules, and a plurality of moisture channels with the upper ends communicated with the air inlet and the lower ends communicated with the; a water collecting unit is arranged in each moisture branch flue. According to the invention, the heat exchange module with the multilayer cross flow channels is adopted to carry out cross flow indirect heat exchange on the unsaturated high-humidity flue gas and the ambient air, so that the heat exchange area of the high-humidity flue gas and the ambient air is greatly increased, the rapid condensation of the unsaturated high-humidity flue gas is promoted, the high-efficiency recovery of condensed water is realized through the water receiving unit, and the operation cost of the high-humidity flue gas treatment device is reduced.)

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.

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, the intermediate products in the mass production process are in a wet state or have a high water content, while the products entering the next process are required to be in a dry state. The material drying mainly utilizes a heat source to heat the wet material, and water in the material is evaporated into gaseous water to be discharged, so that the drying treatment of the material is realized. In the industrial material drying process, partial high-temperature hot air is fed to contact with the material, the hot air flow is utilized to improve the moisture evaporation rate, the drying time can be greatly reduced, and the volume and the investment operation cost of a 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 the water vapor and the 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 water vapor is up to 70-95%, and a small amount of fine material particle dust and the like exist in the drying tail gas according to different material properties.

Unsaturated high-humidity drying tail gas is discharged into the atmospheric environment along with an exhaust system, after the exhaust system is contacted with low-temperature environment air for heat exchange, the temperature of the flue gas is rapidly condensed and cooled to a supersaturated state, a large amount of water vapor is condensed and condensed into fine fog drops, and an obvious white smoke tail wing is formed near a smoke outlet, so that serious visual pollution is caused. Enterprises with a large number of drying devices are often distributed in densely populated industrial factories and suburban areas, white smoke formed by high-humidity tail gas in an area near a smoke exhaust port is difficult to diffuse due to the influence of density in a low-temperature and quiet wind environment in winter, condensed water suspended in air is continuously enriched near a discharge area, and the relative humidity of ambient air is greatly increased; under the environment of higher humidity, gaseous pollutants remained in the air are very easy to generate ultrafine particles by taking suspended liquid drops as carriers to carry out complex physical and chemical reactions, so that the formation of regional haze weather is promoted, and the production, life and body health of people are seriously influenced. Meanwhile, a large amount of gaseous moisture which cannot be recovered is discharged into the environment from unsaturated high-humidity drying tail gas, so that the water consumption of industrial enterprises is large, and the water consumption cost is high.

At present, a direct heating method, a mixed air method, a condensation reheating method and the like are mainly used for treating saturated or supersaturated high-humidity tail gas white smoke. Both the direct heating method and the condensation reheating method require an external heating source to heat the high-humidity flue gas, reduce the humidity of the flue gas to eliminate white smoke, and require a large amount of external heating sources. The heat source added by the heating method white smoke elimination technology needs to be provided by increasing the coal combustion quantity, the system operation energy consumption is higher, and the pollutant emission can be increased by the newly added coal combustion quantity. The air mixing method is characterized in that a large amount of ambient air and high-humidity flue gas are mixed, and then the mixed flue gas is reduced to be below saturated humidity, so that unsaturated emission of the flue gas is realized, and white smoke is eliminated; influenced by the ambient temperature, often need great ambient air volume and desulfurization saturation wet flue gas to mix, it is great that the air mixing device takes up an area of, and mixes the wind fan operation energy consumption higher. For unsaturated high-humidity flue gas, especially dried high-humidity tail gas, the method has the characteristics of small flue gas amount (the flue gas amount of a common drying process is less than 200000Nm3/h), high flue gas temperature (the exhaust temperature of most dried 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 the unsaturated, high-humidity and small-gas-amount smoke such as the drying tail gas, the white smoke eliminating technology which is matched with the smoke and has the advantages of obvious white smoke eliminating effect, low energy consumption, small occupied area, objective water collection amount and stable operation needs to be developed, and at present, the white smoke eliminating technology aiming at the unsaturated and high-humidity tail gas such as the drying tail gas is blank.

Disclosure of Invention

the technical problem to be solved by the invention is to provide a device and a method for eliminating white smoke from unsaturated high-humidity tail gas, which are used for respectively guiding unsaturated high-humidity flue gas and ambient air to a heat exchange module filler with a plurality of layers of cross flow channels for condensation heat exchange, condensing most of water vapor in the unsaturated flue gas into liquid water for recovery, mixing the low-temperature saturated flue gas and the high-temperature ambient air after heat exchange until the flue gas is unsaturated and discharging the liquid water from an exhaust port, so that the unsaturated high-humidity flue gas is discharged without white smoke, and the condensed and recovered water is recycled through a liquid collecting unit, thereby reducing the operation cost of a system.

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

furthermore, each heat exchange module comprises a plurality of first heat exchange plates and a plurality of second heat exchange plates which are stacked up and down at intervals, a plurality of channels are transversely arranged in parallel on each first heat exchange plate and each second heat exchange plate respectively, 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 crossed.

Furthermore, the heat exchange modules are transversely and sequentially grouped in pairs, the two grouped heat exchange modules 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 groups of heat exchange modules are obliquely and inwardly 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 outwardly communicated with the air inlet 12 respectively; the heat exchange modules are connected in a sealing mode, and the length ratio of the moisture channel to the air channel is 1:1-5: 1.

Furthermore, the water receiving unit comprises a water receiving groove and a water guider, the water receiving groove is welded on the side walls of two sides of the moisture branch flue and forms a cavity with an upper opening with the side wall of the moisture branch flue, porous plates are respectively arranged above the water receiving groove, a water outlet communicated with the water receiving groove is arranged outside the moisture branch flue, two sides of the water guider are respectively connected with the porous plates and are erected on the upper side between the water receiving grooves of the two sides, the wet flue gas in the moisture main flue passes through the moisture branch flue and then enters the air inlet 12 through each moisture channel after passing through the water guider, liquid water generated after condensation of the moisture channel 411 flows to the porous plates through the water guider, is accumulated by the porous plates and guided to the water receiving groove and is discharged through the water outlet for recycling.

Furthermore, a cleaning device for cleaning the water distributor is arranged below the water distributor and comprises a plurality of nozzles facing the water distribution module and an external water supply pipe for supplying water to the nozzles; the water guider comprises two groups of water guiding modules distributed in a herringbone manner, each water guiding module comprises a plurality of wave-shaped water guiding blades distributed in a transverse row, and a liquid receiving baffle is arranged on one side wave-shaped water guiding blade between every two adjacent wave-shaped water guiding blades; the oblique outer side of a water chute formed by each liquid receiving baffle and the side wave-shaped water guide blade is connected with the porous plate; liquid water generated after the condensation of the moisture channel flows to the porous plate through the water guide groove and is accumulated and guided to the water collection groove by the porous plate.

Further, be provided with between heat exchange module and the gas vent in the white tower that disappears of receipts water and mix the wind device, mix the wind device and include baffle and a plurality of whirl turbine, the baffle week side is packaged in the white tower that disappears of receipts water, is provided with a plurality of mounting holes on the baffle, is provided with the whirl turbine in each mounting hole respectively, and each whirl turbine includes a plurality of turbine blades, fixed cover and central shaft respectively, and the central shaft sets up in fixed cover axial direction, and a plurality of turbine blades radially distribute in between fixed cover and central shaft, and each fixed cover radially outside is connected with each mounting hole.

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

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 8, comprising the following steps:

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

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

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

Further, the unsaturated high-humidity flue gas in the step 1) forms condensed 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 guider, 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 plate, and is discharged from the water receiving white tower through the water outlet to be recycled, so that the water resource recovery of the high-humidity flue gas is realized.

further, a cleaning device is arranged below the water distributor to intermittently clean the water distributor, so that dust particles in the flue gas are prevented from adhering to and blocking the water distributor, 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.

compared with the prior art, the unsaturated high-humidity tail gas white smoke eliminating device and the method provided by the invention have the advantages that the heat exchange module with the multilayer cross flow channels is adopted to carry out cross flow indirect heat exchange on unsaturated high-humidity flue gas and ambient air, so that the heat exchange area of the high-humidity flue gas and the ambient air is greatly increased, the rapid condensation of the unsaturated high-humidity flue gas is promoted, the high-efficiency recovery of condensed water is realized through the water collecting unit, and the operation cost of the high-humidity flue gas treatment device is reduced;

Condensing unsaturated high-humidity flue gas to recover most of moisture in the flue gas, reducing the content of water vapor in the flue gas, mixing air by taking the self-drawing force generated in the smoke discharging process as a power source to reduce the smoke discharging humidity, reheating the flue gas without adding other heat sources in the white removing process, reducing the air volume of mixed air and reducing the energy consumption in the white removing process of the flue gas;

The moisture channel and the air channel of the heat exchange module are crossed in a cross laminated manner and are obliquely arranged, so that the downward flowing condensed water and the upward flowing wet flue gas generated in the condensation process are promoted to flow in a layered manner, and the resistance of the system is reduced; the cleaning device is arranged below the water deflector to intermittently wash the water deflector, so that dust particles in flue gas are prevented from adhering to and blocking the water deflector, and the operation stability of the system is greatly improved;

The unsaturated high-humidity flue gas forms condensed 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 guider, 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 plate, and is discharged from the water receiving and purifying tower through the water outlet to be recycled, so that the water resource recovery of the high-humidity flue gas is realized.

drawings

FIG. 1 is a schematic plan view of a preferred embodiment of a white smoke abatement device for unsaturated high humidity exhaust gases;

FIG. 2 is a schematic view of an installation structure of two groups of heat exchange modules and a moisture branch flue after being grouped in pairs;

fig. 3 is a schematic structural view of a single heat exchange module in fig. 2.

FIG. 4 is a schematic view of the first heat exchange plate of FIG. 3;

FIG. 5 is a schematic view of the second heat exchange plate of FIG. 3;

FIG. 6 is an assembled schematic view of the first and second heat exchanger plates 42 of FIG. 3 in a spaced stack;

FIG. 7 is an enlarged schematic view of the mounting structure of the water collector and the moisture branch flue;

Fig. 8 is a schematic layout of the wave-shaped water guide vanes 301 of the water guide module in fig. 7.

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

fig. 10 is a perspective view of the rotary knob turbine of fig. 9.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present 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 merely illustrative of the invention and are not intended to limit the invention.