CN219815753U - Air purifying device for chemical fiber manufacturing - Google Patents

Abstract

The utility model discloses an air purification device for chemical fiber manufacturing, which comprises a collecting device for collecting indoor gas, wherein the collecting device is sequentially connected with a blower, a spray tower, a photodecomposition device and a discharge device, at least three filter cottons are arranged in the photodecomposition device at intervals, one end of the photodecomposition device close to the spray tower is a front filter cotton, the rest filter cottons comprise an active carbon filter cottons and a photocatalysis filter cottons, a UV lamp tube is arranged between two adjacent filter cottons, the spray tower with a filler layer and the photodecomposition device with a plurality of layers of filter cottons are arranged through improving the internal structure of the UV photodecomposition treatment device, so that the characteristics of eliminating waste gas peculiar smell can be optimized, the photodecomposition efficiency can be improved, dust generated in the chemical fiber production process can be well solved, and the technical problems of dust non-organized discharge, environment protection and the like can be solved.

Description

Air purifying device for chemical fiber manufacturing

Technical Field

The utility model relates to the technical field of chemical fiber production equipment, in particular to an air purifying device for chemical fiber manufacturing.

Background

When chemical fiber products are produced, a large amount of three wastes are generally discharged, the atmosphere, water, soil and food are polluted, the health of human bodies is directly or indirectly influenced, and the generated waste gas contains smoke, dust, VOC substances and malodor. The pollution intensity of the waste gas is high, the emission amount is high, the pollution components are complex and changeable, and especially, the dust components in the waste gas easily cause great pollution to the atmosphere environment and the factory environment. With the promotion of national policies and the importance of people on environmental protection, enterprises polluting the environment are further regulated and remedied.

Due to the characteristics of materials, during the production of chemical fiber products, more dust containing material components can be generated in the spinning and heat treatment processes, the continuous production has a great influence on the production environment, the working environment of staff does not meet the requirements of occupational health safety standards, and the generated dust needs to be discharged, so that the aim of protecting the working environment is fulfilled. At present, a high-power exhaust fan device is installed in a production area for dust extraction operation in the same line so as to achieve the aim of improving the production environment, and the effect brought by the device is that the indoor dust can only be partially discharged and directly discharged into the atmosphere, so that the device partially improves the working environment but causes local pollution of the atmosphere, belongs to the unorganized emission and does not meet the requirement of environmental protection. Therefore, under the requirements of environmental protection regulations, the exhaust device of the waste gas needs to comprise corresponding treatment and purification devices, such as a silk screen foam removing device, an acid washing spray tower, a sodium hypochlorite advanced oxidation tower, a demisting device, a UV photolysis treatment device and the like, but the existing UV photolysis treatment device still has more problems in structural design, can not well solve the problem of eliminating the peculiar smell of the waste gas, and can not achieve the maximization of the photolysis efficiency in terms of photolysis efficiency, and has higher energy consumption in the practical use process.

Disclosure of Invention

The utility model aims to solve the problem of lower efficiency of a UV photolysis treatment device in the existing chemical fiber exhaust device, and provides an air purification device for chemical fiber manufacture, by improving the internal structure of the UV photolysis treatment device, the characteristics of eliminating waste gas peculiar smell can be optimized, the photolysis efficiency can be improved, dust generated in the spinning and heat treatment processes in chemical fiber production can be solved, and the technical problems of unorganized dust emission, environment protection, production failure and the like can be solved.

The technical scheme adopted by the utility model is as follows:

the utility model provides an air purification device for chemical fiber manufacturing, is including the collection device who is used for collecting indoor gas, and collection device has connected gradually air-blower, spray column, photodecomposition device and emission device, and photodecomposition device internal space is provided with at least three filter cotton, and wherein is close to spray column one end and is leading filter cotton, and remaining filter cotton includes active carbon filter cotton and photocatalysis filter cotton, is provided with the UV fluorescent tube between two adjacent filter cotton. Specifically, a spray air inlet and a spray air outlet are respectively arranged on the spray tower, a photodecomposition air inlet and a photodecomposition air outlet connected with the discharge device are respectively arranged on the photodecomposition device, the spray air inlet is connected with the blower, and the spray air outlet is connected with the photodecomposition air inlet.

The working principle of the utility model is as follows: the collecting device collects the waste gas in the workshop production area, and the collected waste gas is introduced into the spray tower through the spray air inlet under the action of the air blower, and substances such as acid gas, alcohols and particulate matters in the waste gas are removed through spray washing in the spray tower, so that the influence on subsequent equipment (such as a photodecomposition device) is eliminated. The gas after spray washing enters the photodecomposition device through the spray air outlet and the photodecomposition air inlet, and is subjected to multistage purification in the photodecomposition device. The waste gas is first of all subjected to primary filtration by the front-end filter cotton, and the front-end filter cotton comprises water absorption filter cotton and primary filter cotton, and the two-layer front-end filter cotton is mainly used for removing residual water mist and fine dust in the waste gas so as to reduce the influence on rear-end equipment. For example, water mist can cause circuit failure and dust adhering to the UV lamp tube can affect the removal efficiency of contaminants. The waste gas after preliminary filtration enters a photodecomposition area formed by a UV lamp tube and photocatalysis filter cotton, the waste gas is decomposed under the action of strong oxidation particles such as free radicals, ozone, negative oxygen ions and the like, and waste gas substances are decomposed into low-molecular compounds, water and carbon dioxide by absorbing energy of photons or other particles to break chemical bonds; meanwhile, the titanium dioxide catalytic layer on the photocatalytic filter cotton can generate photoelectric effect by irradiation of UV light, so that high-energy particles are generated, molecular bonds of bacteria in the waste gas are cracked, and then oxidation reaction is carried out by ozone, so that pollution components in the waste gas are further decomposed. Meanwhile, the waste gas is filtered by the activated carbon filter cotton and subjected to photolysis and ozone oxidation, most of the waste gas forms water and carbon dioxide, and the peculiar smell of the waste gas is greatly eliminated at the moment to reach the emission standard. And after the gas reaches the standard, discharging the gas to the atmosphere through a discharging device connected with the photodecomposition gas outlet.

Further, the outside of the photodecomposition device is provided with a plurality of electric cabinets and switches, the electric cabinets are responsible for supplying power to the switches and the UV lamp tubes, operators can directly operate the electric cabinets to realize the switching of the UV lamp tubes, and also can realize the automatic control of the UV lamp tubes through control equipment (such as a PLC controller). Two groups of UV lamps are arranged in the chamber between two adjacent filter cottons, the UV lamps are controlled in groups, the switch can adjust the opening quantity of the UV lamps according to the change of the waste gas quantity or the pollutant concentration, and the energy consumption can be properly reduced while the treatment effect is achieved. When the exhaust gas quantity or the pollutant concentration exceeds a set value, both groups of UV lamp tubes in the same chamber are started; similarly, when the exhaust gas amount or the pollutant concentration is at an intermediate value, any one set of UV lamps in the same chamber is turned on.

Further, a plurality of packing layers are arranged in the spray tower, a spraying device is arranged above each packing layer, waste gas moves from bottom to top in the spray tower, water sprayed by the spraying device drops downwards under the action of gravity, air flow and liquid do gas-liquid countercurrent movement in the spray tower, and circulating water is utilized to spray and absorb dust. Through the multistage packing layer, the waste gas and the spray water are fully contacted in a gas-liquid two-phase manner, and pollutants in the waste gas are oxidized and absorbed.

Further, the spraying device comprises spraying pipes, the number of which corresponds to that of the packing layers, the spraying pipes are connected with water inlet pipes, and the water inlet pipes are connected with a circulating water system; the spray water recovery device and the water outlet pipe are arranged at the bottom of the spray tower, and the spray water recovery device is connected with the circulating water system through the water outlet pipe. The circulating water is pumped into a water inlet pipe from the spray water recovery device, then the circulating water is sprayed out by a spray pipe, and substances such as acid gas, alcohols, particulate matters and the like in the waste gas are removed through washing, so that the influence on subsequent equipment is eliminated; the circulating water drops under the action of gravity and is collected by a spray water recovery device arranged at the inner bottom of the spray tower, so that the effect of recycling is achieved. Since the exhaust gas contains acid gas, a certain amount of alkaline substances needs to be added to the spray water recovery device periodically to balance the pH value of the circulating water.

Further, the circulating water system comprises a water pump, a liquid filtering device and an external interface for replacing circulating water, wherein the water inlet pipe, the water pump, the liquid filtering device and the water outlet pipe are sequentially connected, the water pump is a multi-way water pump, and the water pump is connected with the external interface. And under the action of a water pump, the spray water collected by the spray water recovery device flows to the liquid filtering device along the water outlet pipe to perform preliminary filtration, the washed particulate matters are filtered, and then the water inlet pipe is subjected to repeated spraying. When the spraying time length reaches a preset value, the connecting channel of the water pump is adjusted to enable the spraying water to be discharged from the external interface, and meanwhile, an uncontaminated clean water source is supplemented from the external interface and enters the circulating water system to participate in spraying.

Further, a swirl plate is arranged in the spray tower, the swirl plate rotates around the axis of the spray tower, upward thrust is generated by rotation of the swirl plate, and waste gas in the spray tower is assisted to move upwards.

Further, the spray air outlet is arranged at the top of the spray tower. Because the excessive waste gas of humidity gets into photodecomposition device and can lead to circuit trouble easily, influences its life, consequently spray and set up to defogging layer between gas outlet and the packing layer that is closest to it, be provided with the baffling board in the defogging layer. When the gas containing mist flows through the baffle plate at a certain speed, the mist collides with the baffle plate and is attached to the surface of the baffle plate due to the inertia impact effect of the gas, and the gravity sedimentation of the mist enables the mist to be separated from the surface of the baffle plate, so that the demisting effect is achieved.

Further, the outer side wall of the spray tower is provided with a ladder stand and a plurality of observation holes, the observation holes are formed in the adjacent side of the ladder stand, and the setting height of the observation holes is the same as that of each packing layer. The cat ladder is convenient for operating personnel to ascend a height, and the operation condition inside the spray tower is checked through the observation hole, so that whether the packing in the packing layer needs to be replaced is judged in time.

Further, the discharge device comprises a discharge chimney and an exhaust fan connected with the photodecomposition air outlet, the air outlet end of the exhaust fan is connected with the chimney, and the height of the chimney is at least 15 meters. The exhaust fan pumps the UV photolyzed gas from the photodecomposition device, and the gas is discharged to the atmosphere from a chimney, and the height of the chimney is 15 or more, so as to reduce the concentration of the gas discharged from the chimney and falling to the ground.

Further, in order to meet the requirements of environmental protection policies, a sampling platform and a sampling port are arranged on the chimney, so that the gas and the smoke at the smoke outlet of the chimney can be sampled in the field at regular time, and the emission of pollutants is ensured to be in a qualified range.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, through the spray tower provided with the multi-stage packing layers and the photodecomposition device provided with the multi-layer filter cotton, the characteristic of eliminating waste gas peculiar smell can be optimized by improving the internal structure of the UV photodecomposition treatment device, the photodecomposition efficiency can be improved, dust generated in the chemical fiber production process can be solved, and the technical problems of unorganized dust emission, environment protection, substandard environment protection and the like are solved;

2. according to the utility model, the baffle plate is arranged at the top of the spray tower, so that the air flow is more uniform, the demisting effect is improved, and the service life of rear-end equipment is ensured; the whole floor area is small, the purifying effect is good, and the efficiency is high.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a front half sectional view of the spray tower of the present utility model;

FIG. 3 is a schematic view showing the overall structure of the photodecomposition device of the present utility model;

fig. 4 is a schematic view showing an internal structure of the photodecomposition device of the present utility model.

In the accompanying drawings:

1-a collection device; 2-a blower; 3-a spray tower; 301-spraying an air inlet; 302-spraying an air outlet; 303-a filler layer; 304-a spray pipe; 305-a water inlet pipe; 306-spray water recovery device; 307-outlet pipe; 308-a swirl plate; 309-a mist removal layer; 310-baffle plate; 4-photodecomposition means; 401-photodecomposition gas inlet; 402-photodecomposition gas outlet; 403-pre-filter cotton; 404-activated carbon filter cotton; 405-photocatalytic filter cotton; 406-UV lamp tube; 407-an electric cabinet; 5-climbing a ladder; 6-observation holes; 7-chimney; 701-sampling platform; 702—a sampling port; 8-exhaust fan.

Detailed Description

The utility model is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "front", "rear", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances. Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

Embodiment one:

referring to fig. 1 or 4, the present embodiment provides an air purifying device for chemical fiber manufacturing, which includes a collecting device 1 for collecting indoor gas, wherein the collecting device 1 is sequentially connected with a blower 2, a spray tower 3, a photodecomposition device 4 and a discharge device. The collecting device 1 collects the waste gas in the workshop production area, the collected waste gas is treated by the spray tower 3 and the photodecomposition device 4 under the action of the blower 2, so that the waste gas reaches the emission standard regulated by the related policy, and finally the waste gas is discharged by the emission device.

The spray tower 3 is respectively provided with a spray air inlet 301 and a spray air outlet 302, the photodecomposition device 4 is respectively provided with a photodecomposition air inlet 401 and a photodecomposition air outlet 402 connected with a discharge device, the spray air inlet 301 is connected with a blower 2, the spray air outlet 302 is connected with the photodecomposition air inlet 401, five filter cottons are arranged in the photodecomposition device 4 at intervals, one end close to the photodecomposition air inlet 401 is a front filter cottons 403, one end close to the photodecomposition air outlet 402 is an activated carbon filter cottons 404, the other three are photocatalytic filter cottons 405, and a UV (ultraviolet) light tube 406 is arranged between two adjacent filter cottons.

In the spray tower 3, the waste gas is sprayed and washed to remove substances such as acid gas, alcohols, particulate matters and the like, so that the influence on subsequent equipment (such as the photodecomposition device 4) is eliminated. The sprayed and washed gas enters the photodecomposition device 4 through the spray gas outlet 302 and the photodecomposition gas inlet 401, and is subjected to multistage purification in the photodecomposition device 4. The waste gas is initially subjected to preliminary filtration by a pre-filter cotton 403, the pre-filter cotton 403 including a water-absorbing filter cotton and a preliminary filter cotton. The water mist in the exhaust gas causes circuit failure, and dust is easily attached to the upper surface of the UV lamp tube, so that the removal efficiency of the UV light on pollutants is affected. The two layers of pre-filter cotton 403 are mainly used for removing residual water mist and fine dust in the exhaust gas so as to reduce the influence on the back-end equipment. The waste gas after preliminary filtration enters a photodecomposition area formed by a UV lamp tube 406 and photocatalysis filter cotton 405, the waste gas is decomposed under the action of strong oxidation particles such as free radicals, ozone, negative oxygen ions and the like, and waste gas substances are decomposed and converted into low molecular compounds, water and carbon dioxide by absorbing energy of photons or other particles so that chemical bonds are broken; meanwhile, the titanium dioxide catalytic layer on the photocatalytic filter cotton 405 can generate photoelectric effect by irradiation of UV light, so that high-energy particles are generated, molecular bonds of bacteria in the waste gas are cracked, and then oxidation reaction is carried out by ozone, so that pollution components in the waste gas are further decomposed. Finally, the waste gas is subjected to final filtration by the activated carbon filter cotton 404, most of the waste gas is oxidized and filtered to form water and carbon dioxide, and the gas reaches the emission standard at this time and is discharged through an emission device.

Embodiment two:

as shown in fig. 3 and 4, in order to properly reduce energy consumption while achieving the processing effect on the basis of the first embodiment, in this embodiment, a plurality of electric cabinets 407 and switches are provided outside the photodecomposition device 4, and the electric cabinets 407 are responsible for supplying power to the switches and the UV lamps 406. An operator can directly operate a switch on the electric cabinet 407 to control the UV lamp 406, and of course, other control devices can also be used to realize automatic control.

The photodecomposition device 4 is also provided with a monitor for monitoring the concentration of pollutants, the monitor is arranged on the photodecomposition air inlet 401 (not shown in the figure), and two groups of UV lamps 406 are arranged in a chamber between two adjacent filter cottons, the UV lamps 406 adopt 185nm+254nm dual-band quartz lamps, and the switch can adjust the opening quantity of the UV lamps 406 according to the exhaust gas quantity or the concentration of the pollutants by adopting grouping control. 185nm and 254nm are the luminous lines commonly used in ultraviolet germicidal lamps (i.e. UV lamps), wherein 185nm ultraviolet rays can change oxygen in the air into ozone, and the ozone has strong oxidization and can effectively kill bacteria. Meanwhile, the dispersion of the ozone can exactly make up the defect that dead angles exist in disinfection because ultraviolet rays only propagate along a straight line. In addition, 254nm ultraviolet rays can kill bacteria immediately or can not reproduce bacteria by irradiating DNA of microorganisms and destroying and changing the DNA structure of the microorganisms.

When the monitor in the light splitting device 4 detects that the concentration of the contaminant exceeds a set point, or that the amount of exhaust gas passing through the light splitting device 4 is too great, both sets of UV lamps 406 in the same chamber are turned on. When the exhaust gas amount is small or the pollutant concentration does not exceed the set value, an operator can alternately turn on the two groups of UV lamps 406 in the same chamber through the electric control box 407 and the switch, so as to achieve the effect of energy saving.

Embodiment III:

referring to fig. 1 or 2, this embodiment provides an air purifying device for chemical fiber manufacturing, which is different from the air purifying device disclosed in the first embodiment, in this embodiment, a plurality of packing layers 303 are disposed in the spray tower 3, and a sufficient amount of polyhedral hollow sphere packing is disposed in each packing layer 303. The polyhedral hollow sphere filler is a sphere composed of two hemispheres, each hemisphere is composed of a plurality of half fan-shaped blades, and the upper blades and the lower blades are arranged in a staggered manner, so that the polyhedral hollow sphere filler has the advantages of being easy to completely accumulate in the filler layer 303, but not causing bridging and void effects, and being beneficial to uniform gas-liquid distribution. A cyclone plate 308 is arranged below each packing layer 303, and the cyclone plate 308 is a horizontally arranged wind driven device, and the rotation of the wind driven device can generate upward thrust to assist the upward movement of the waste gas in the spray tower 3. And spraying pipes 304 are arranged above the packing layers 303, the spraying pipes 304 are connected with water inlet pipes 305, and the water inlet pipes 305 are arranged on the outer side wall of the spraying tower 3. Under the pushing of the water pump, the water inlet pipe 305 draws circulating water from the spray water recovery device 306, water is conveyed into the spray pipe 304 and sprayed out by the spray pipe 304, and the waste gas flowing through the spray tower 3 is sprayed and washed to absorb substances such as acid gas, alcohols, particulate matters and the like in the waste gas, so that the influence on back-end equipment is eliminated. The spray pipe 304 can rotate around the normal direction of the packing layer 303 where the spray pipe is positioned, so that a better spray effect is realized, and the waste gas in the spray tower 3 can be fully moistened. Under the action of gravity, the spray water (namely circulating water) drops and falls into a spray water recovery device 306 arranged at the bottom of the spray tower 3 to be recovered, and then is conveyed to a water pump by a water outlet pipe 307 connected with the spray water recovery device 306 to be recycled. Since the exhaust gas contains acid gas, a certain amount of alkaline substances needs to be added to the shower water recovery device 306 at regular intervals to balance the ph of the circulating water.

In order to be able to observe the packing service conditions in the packing layer 303 in time, the outer side wall of the spray tower 3 is provided with a ladder stand 5 and an observation hole 6, and the observation hole 6 is arranged on one side of the ladder stand 5. When an operator climbs up the crawling ladder 5, the operator can lean on to look over the condition of each packing layer 303 in the spray tower 3 through the observation holes 6, and whether the packing in the packing layer 303 needs to be replaced is judged in time.

Embodiment four:

on the basis of the third embodiment, in order to overcome the problem that the excessive humidity of the exhaust gas entering the photodecomposition device 4 can easily cause circuit failure, in this embodiment, referring to fig. 2, a demisting layer 309 is disposed between the spray air outlet 302 and the packing layer 303 closest thereto, and a baffle plate 310 is disposed in the demisting layer 309. The baffle 310 is typically in the form of a streamlined two/three channel, a broken line type two/three channel, a streamlined two channel hooked type, etc., and has the characteristics of convenient cleaning and maintenance due to an open structure, and low cost.

The principle of demisting using baffles 310 is: when the gas containing mist flows through the baffle 310 at a certain speed, the mist collides with the baffle 310 and adheres to the surface of the baffle 310 due to the inertial collision of the gas. Mist gathers into larger droplets on the surface of baffle 310 and moves forward with the gas flow to the turns of baffle 310, causing droplets to become larger and larger due to the steering centrifugal force, the surface tension of the liquid and its friction with baffle 310, until the gathered droplets are separated from the surface of baffle 310 by gravity exceeding the resultant force of the lifting force of the gas and the surface tension of the liquid. Baffles 310 in the mist eliminator 309 increase the probability of mist being captured, and mist not removed can be captured continuously at the next turning, and repeated actions can greatly improve the mist eliminating efficiency. The gas passes through the defogging layer 309 and then enters the photodecomposition device 4 without damaging the circuits in the photodecomposition device 4.

In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The utility model provides an air purification device for chemical fiber manufacturing, including being used for collecting indoor gaseous collection device (1), collection device has connected gradually air-blower (2), spray column (3), photodecomposition device (4) and discharging equipment, its characterized in that, the interval is provided with at least three filter cotton in photodecomposition device (4), wherein is close to spray column (3) one end and is leading filter cotton (403), and other filter cotton includes active carbon filter cotton (404) and photocatalysis filter cotton (405), is provided with UV fluorescent tube (406) between two adjacent filter cotton.

2. The air purification device for chemical fiber manufacturing according to claim 1, wherein a plurality of electric cabinets (407) and switches are arranged outside the photodecomposition device (4), and the electric cabinets (407) are responsible for supplying power to the switches and the UV lamp tubes (406); the UV lamps (406) are controlled in groups, and the switch can adjust the opening quantity of the UV lamps (406) according to the change of the exhaust gas quantity or the pollutant concentration.

3. The air purification device for chemical fiber manufacturing according to claim 1 or 2, wherein a plurality of packing layers (303) are arranged in the spray tower (3), and a spray device is arranged above each packing layer (303).

4. An air cleaning device for chemical fiber manufacturing according to claim 3, characterized in that the spraying device comprises spraying pipes (304) corresponding to the number of the filler layers (303), the spraying pipes (304) are connected with water inlet pipes (305), and the water inlet pipes (305) are connected with a circulating water system; the inner bottom of the spray tower (3) is provided with a spray water recovery device (306) and a water outlet pipe (307), and the spray water recovery device (306) is connected with a circulating water system through the water outlet pipe (307).

5. The air purification device for chemical fiber manufacturing according to claim 4, wherein the circulating water system comprises a water pump, a liquid filtering device and an external interface for replacing circulating water, the water inlet pipe (305), the water pump, the liquid filtering device and the water outlet pipe (307) are sequentially connected, the water pump is a multi-way water pump, and the water pump is connected with the external interface.

6. An air cleaning device for chemical fiber manufacturing according to claim 3, characterized in that a swirl plate (308) is provided in the spray tower (3), the swirl plate (308) rotating around the axis of the spray tower (3).

7. An air cleaning device for chemical fiber manufacturing according to any one of claims 4-6, characterized in that a demisting layer (309) is arranged between the uppermost packing layer (303) and the top of the spray tower (3), and a baffle (310) is arranged in the demisting layer (309).

8. An air cleaning device for chemical fiber manufacturing according to claim 3, characterized in that the outer side wall of the spray tower (3) is provided with a ladder stand (5) and a plurality of observation holes (6), the observation holes (6) are arranged on the adjacent side of the ladder stand (5), and the arrangement height of the observation holes (6) is the same as that of each packing layer (303).

9. An air cleaning device for chemical fiber manufacturing according to claim 1, characterized in that the discharge means comprises a discharge chimney (7) and an exhaust fan (8) connected to the photodecomposition air outlet (402), the air outlet end of the exhaust fan (8) being connected to the chimney (7), the height of the chimney (7) being at least 15 meters.

10. The air purification device for chemical fiber manufacturing according to claim 9, wherein the chimney (7) is provided with a sampling platform (701) and a sampling port (702).