CN209865618U - Dust removal filter equipment - Google Patents

Abstract

The utility model discloses a dust removal and filtration device, which comprises a cylinder body, a dust removal device arranged on the upper part of the cylinder body, a filtration device arranged on the lower part of the cylinder body, an air inlet arranged on the side wall of the cylinder body and an air outlet arranged on the top of the cylinder body; this dust removal filter equipment can carry out degree of depth to waste gas and remove dust, thoroughly with the impurity clearance in the waste gas, filters the purification to the waste water that the clearance produced simultaneously, makes waste water can not influence the effect of removing dust in cyclic utilization.

Description

Dust removal filter equipment

Technical Field

The invention relates to the field of gas dust removal treatment, in particular to a dust removal filtering device.

Background

In some production fields, waste gas with a large amount of dust is often generated, such as coal mine dust generated in coal mining processing, dust generated in grain storage and drying processes, lime dust generated in cement production processes, wood dust generated in furniture board production processes and the like, and the atmospheric pollution level is seriously increased if the dust-carrying gas is directly discharged into the atmosphere. In order to purify the gas with a large amount of dust, a tower-type water mist dust removal device in the prior art generally comprises a tower-type dust removal cavity, wherein one group or a plurality of groups of water mist spray nozzles are arranged in the dust removal cavity, the dust-carrying gas enters from the lower end of the dust removal cavity and is discharged from the upper end of the dust removal cavity, and in the process of moving from bottom to top in the dust removal cavity, water vapor generated by the water mist spray nozzles is sprayed from top to bottom, the water vapor and the dust form convection, the water vapor and dust particles in the dust condense to form fine water drops in the convection process, after the water vapor and the dust particles in the dust fall together at the lower end of the dust removal cavity, the water vapor is discharged through a drain outlet arranged at the bottom of the dust removal cavity or is directly sprayed to the waste water in a circulating manner, the waste water resources are directly discharged, impurities in the waste water are easily.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a dust removal filter equipment, this dust removal filter equipment can carry out the degree of depth to waste gas and remove dust, thoroughly with the impurity clearance in the waste gas, carries out filtration purification to the waste water that the clearance produced simultaneously, makes waste water can not influence the effect of dust removal in cyclic utilization.

The utility model discloses a realize through following technical scheme:

a dust removal and filtration device comprises a cylinder, a dust removal device arranged on the upper part of the cylinder, a filtration device arranged on the lower part of the cylinder, an air inlet arranged on the side wall of the cylinder and an air outlet arranged on the top of the cylinder;

the dust removal device comprises a first spraying system arranged on the upper part of the air inlet and a second spraying system arranged on the upper part of the first spraying system, wherein the first spraying system comprises a first spraying pipe and a first nozzle arranged on the first spraying pipe;

the second spraying system comprises a filter plate, a folding filter screen, a second spraying pipe and a second nozzle, the filter plate is arranged at the lower part of the second spraying system, the second spraying pipe is arranged at the upper part of the filter plate, the second nozzle is arranged on the second spraying pipe, and the folding filter screen is arranged between the second spraying pipe and the filter plate;

the filter device comprises a primary filter device and a depth filter device, the primary filter device comprises a filter screen, a guide plate and a guide pipe, the filter screen is arranged at the lower part of the air inlet, the guide plate is arranged at the lower part of the filter screen, and the lower part of the guide plate is connected with the guide pipe;

the depth filtering device comprises a filtering tank, a supporting plate and a mud bucket which are arranged at the lower part of the barrel, the mud bucket is arranged at the bottom of the barrel, the upper part of the mud bucket is connected with the supporting plate, the bottom of the filtering tank is fixedly connected with the barrel through the supporting plate, the side wall of the lower part of the barrel is also provided with a water inlet pipe and a water outlet pipe, the water inlet pipe is arranged at the upper part of the water outlet pipe, and the water outlet pipe is arranged above the supporting plate;

the filter tank is internally provided with a filtering system and a back flushing system, the filtering system comprises a water distributor, a pore plate, a filtering medium, a water delivery pipe, a water pump and a circulating pipe, the top of the filtering tank is provided with the water distributor, the lower part of the filtering tank is provided with the pore plate, the pore plate is provided with the filtering medium, the side wall of the lower part of the filtering tank is provided with the water delivery pipe, the water delivery pipe is connected with the water pump, the other end of the water pump is connected with the water inlet end of the circulating pipe, and the water outlet end of the circulating pipe is respectively connected; the backwashing system comprises a backwashing sprayer and a backwashing pipe, the lower part of the pore plate is provided with the backwashing sprayer, the backwashing sprayer is connected with the backwashing pipe, and the backwashing pipe penetrates through the filter tank and the side wall of the cylinder body and extends to the outside of the cylinder body;

the side wall of the mud bucket is provided with a mud discharging port, and the mud discharging port penetrates through the side wall of the barrel and extends to the outer side of the barrel.

In the above technical scheme, the sludge discharge port is provided with a sludge suction pump.

In the technical scheme, a dehydration device is arranged in the cylinder body, and the dehydration device is arranged at the upper part of the second spraying system.

In the above technical scheme, the dehydration device comprises an outer frame body and a water vapor adsorption filtration ceramic filler, wherein the water vapor adsorption filtration ceramic filler is filled in the outer frame body.

In the technical scheme, the filter medium is one or more of quartz sand, diatomite, manganese sand, ceramsite and activated carbon.

In the technical scheme, the folding filter screen is a multi-layer porous screen, and different mesh apertures and metal screen layer numbers can be selected according to the dust property and the filtering efficiency.

In the technical scheme, the bottom of the filter tank is provided with a pore plate and covered with a stainless steel net, and the pore size of the pore plate is 1/4 which is the nominal diameter of the filter medium particles.

In the technical scheme, water inlet holes with the aperture more than 10 times of the nominal diameter of the filter medium particles are uniformly distributed on the water distributor, the upper part and the lower part of the water distributor are covered by stainless steel nets, and the stainless steel nets are fixedly connected with the water distributor.

In the technical scheme, the backwashing sprayer comprises a sprayer body and a nozzle body, wherein the nozzle body is arranged at the upper end of the sprayer body, a bidirectional filter and a water stopping device are arranged inside the sprayer body, the water stopping device is arranged at the upper end of the bidirectional filter, and the bidirectional filter and the water stopping device are respectively arranged in an accommodating cavity a and an accommodating cavity b inside the sprayer body; the water stopping device consists of a water transmission rotor, a spring and a water stopping ball which are connected in sequence; the bidirectional filter comprises an end cover, an inner barrel and an outer barrel, the end cover is installed at the two ends of the outer barrel, the inner barrel is arranged in the outer barrel, the end cover comprises a bottom end cover and a top end cover, a water outlet is formed in the surface of the top end cover, a sealing ring b and a sealing ring c are further arranged on the outer side surfaces of the bottom end cover and the top end cover, and a nozzle piece, a protection piece and a sealing ring a are sequentially arranged in the nozzle body.

In the above technical scheme, the bottom of the spray head body is provided with the locking cover.

The utility model discloses an advantage and beneficial effect do: this dust removal filter equipment can carry out degree of depth to waste gas and remove dust, thoroughly with the impurity clearance in the waste gas, filters the purification to the waste water that the clearance produced simultaneously, makes waste water can not influence the effect of removing dust in cyclic utilization.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic structural diagram of the third embodiment.

Wherein:

1: barrel, 2: dewatering device, 3: second shower, 4: foldable filter screen, 5: filter plate, 6: first shower, 7: air inlet, 8: filter screen, 9: deflector, 10: honeycomb duct, 11: inlet tube, 12: backwash pipe, 13: water outlet pipe, 14: air outlet, 15: circulation pipe, 16: sedimentation tank, 17: water distributor, 18: a filtration tank, 19: filter medium, 20: orifice plate, 21: water delivery pipe, 22: water pump, 23: support plate, 24: sludge discharge port, 25: mud bucket, 26: back washing spray head, 26-1: bottom end cap, 26-2: outer cylinder, 26-3: inner cylinder, 26-4: top end cap, 26-5: nozzle body, 26-6: nozzle sheet, 26-7: protective sheet, 26-8: sealing ring a, 26-9: water stopping ball, 26-10 spring, 26-11: water transport rotor, 26-12: nozzle body, 26-13: locking cover, 26-14: sealing ring b, 26-15: sealing rings c, 26-16: cavity a, 26-17: a cavity b.

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

In order to make the technical field person understand the solution of the present invention better, the technical solution of the present invention is further described below with reference to the specific embodiments.

Example one

A dust removal filter device comprises a cylinder 1, a dust removal device arranged on the upper part of the cylinder 1, a filter device arranged on the lower part of the cylinder 1, an air inlet 7 arranged on the side wall of the cylinder 1 and an air outlet 14 arranged on the top of the cylinder 1;

the dust removal device comprises a first spraying system arranged on the upper part of the air inlet 7 and a second spraying system arranged on the upper part of the first spraying system, wherein the first spraying system comprises a first spraying pipe 6 and a first nozzle arranged on the first spraying pipe 6;

the second spraying system comprises a filter plate 5, a foldable filter screen 4, a second spraying pipe 3 and a second nozzle, the filter plate 5 is arranged at the lower part of the second spraying system, the second spraying pipe 3 is arranged at the upper part of the filter plate 5, the second spraying pipe 3 is provided with the second nozzle, and the foldable filter screen 4 is arranged between the second spraying pipe 3 and the filter plate 5;

the filter device comprises a primary filter device and a depth filter device, the primary filter device comprises a filter screen 8, a guide plate 9 and a guide pipe 10, the filter screen 8 is arranged at the lower part of the air inlet 7, the guide plate 9 is arranged at the lower part of the filter screen 8, and the lower part of the guide plate 9 is connected with the guide pipe 10;

the depth filtering device comprises a filtering tank 18, a supporting plate 23 and a mud bucket 25 which are arranged at the lower part of the cylinder body 1, wherein the mud bucket 25 is arranged at the bottom of the cylinder body 1, the upper part of the mud bucket 25 is connected with the supporting plate 23, the bottom of the filtering tank 18 is fixedly connected with the cylinder body 1 through the supporting plate 23, the side wall of the lower part of the cylinder body 1 is also provided with a water inlet pipe 11 and a water outlet pipe 13, the water inlet pipe 11 is arranged at the upper part of the water outlet pipe 13, and the water outlet pipe 13 is arranged above the supporting plate 23;

a filtering system and a back flushing system are arranged in the filtering tank 18, the filtering system comprises a water distributor 17, a pore plate 20, a filtering medium 19, a water delivery pipe 21, a water pump 22 and a circulating pipe 15, the water distributor 17 is arranged at the top of the filtering tank 18, the pore plate 20 is arranged at the lower part of the filtering tank 18, the filtering medium 19 is arranged on the pore plate 20, the water delivery pipe 21 is arranged on the side wall of the lower part of the filtering tank 18, the water delivery pipe 21 is connected with the water pump 22, the other end of the water pump 22 is connected with the water inlet end of the circulating pipe 15, and the water outlet end of the circulating pipe 15 is respectively connected with the first; the backwashing system comprises a backwashing spray head 26 and a backwashing pipe 12, the backwashing spray head 26 is arranged at the lower part of the pore plate 20, the backwashing spray head 26 is connected with the backwashing pipe 12, and the backwashing pipe 12 passes through the filter tank 18 and the side wall of the cylinder body 1 and extends to the outside of the cylinder body 1;

the side wall of the mud bucket 25 is provided with a mud discharging port 24, and the mud discharging port 24 penetrates through the side wall of the barrel body 1 and extends to the outer side of the barrel body 1.

Preferably, the sludge discharge port 24 is provided with a sludge suction pump.

Preferably, a dehydration device 2 is arranged in the cylinder 1, and the dehydration device 2 is arranged at the upper part of the second spraying system.

Preferably, the dehydration device 2 includes an outer frame and a water vapor adsorption and filtration ceramic filler, and the water vapor adsorption and filtration ceramic filler is filled in the outer frame.

The working mode is as follows:

smoke enters the cylinder 1 through the air inlet and is fully mixed and contacted with a water curtain sprayed out by the first spraying system, dust in the smoke is carried into a filter screen 8 in the cylinder 1 by water flow under the combined action of washing and natural sedimentation, larger sludge particles are blocked by the filter screen 8, the remaining wastewater flows downwards through the filter screen 8, is gathered at a guide pipe 10 by a guide plate 9 and enters a sedimentation tank 16 through the guide pipe 10, and the primarily filtered smoke upwards passes through the second spraying system; the bigger granule in the flue gas can not pass through filter 5, and the less flue gas of granule reaches degree of depth dust removal at foldable filter screen 4 and second spraying system spun rivers combined action behind filter 5. When the cleaned flue gas contains a large amount of water mist and passes through the water mist removing device, the water vapor adsorption and filtration ceramic filler can adsorb a large amount of water mist, so that the water mist is condensed into large water drops and drops to the bottom of the cylinder body 1.

The water flow sprayed by the first spraying system and the second spraying system drops on the guide plate 9 after washing smoke dust, and then flows into the sedimentation tank 16 through the guide pipe 10 to form the change of the water flow direction of the inlet water for the first time; the large-particle solid matters quickly settle into the mud bucket 25, and are discharged out of the sedimentation tank 16 through the mud discharge port 24 by a mud suction pump at regular time according to the mud accumulation condition; the liquid level in the sedimentation tank 16 rises from bottom to top, when the liquid level overflows the top water distributor 17 of the filter tank 18, water flows into the filter tank 18 from the top water distributor 17, and flows out of the water delivery pipe 21 through the filter medium 19, and under the action of the water pump 22, the water in the water delivery pipe 21 is recycled through the water pump 22 and the circulating pipe 15; when the water flux in the filter tank 18 decreases, the backwash pump is activated to flush and regenerate the filter media 19 through the backwash nozzle 26 through the backwash pipe 12. When the water in the sedimentation tank 16 is too little or the mud is too much, clean water is flushed into the sedimentation tank 16 through the water inlet, and the sedimentation tank 16 can be cleaned or replenished with water.

Example two

The embodiment is further optimized on the basis of the first embodiment.

Preferably, the filter medium 19 is one or more of quartz sand, diatomite, manganese sand, ceramsite and activated carbon.

Preferably, the foldable filter screen 4 is a multi-layer porous screen, and different mesh apertures and metal mesh layers can be selected according to the dust property and the filtering efficiency.

Preferably, the bottom of the filter tank 18 is provided with a perforated plate 20 covered with a stainless steel net, and the pore size of the mesh is 1/4 which is the nominal diameter of the particles of the filter medium 19.

Preferably, water inlets with a diameter more than 10 times of the nominal diameter of the particles of the filter medium 19 are uniformly distributed on the water distributor 17, and stainless steel nets are covered on the upper and lower parts of the water distributor 17 and fixedly connected with the water distributor 17.

The working mode is as follows:

the stainless steel net is fixed on the water distributor 17 by bolts; 1/2 the aperture of the stainless steel net covering the water distributor 17 is the nominal diameter of the particles of the filter medium 19; filling one or more of filter media 19 such as quartz sand, diatomite, manganese sand, ceramsite, activated carbon and the like into the filter tank 18 according to different requirements of the washed water quality; the bottom of the filtering tank 18 is provided with a water delivery pipe 21, a pore plate 20 is arranged, the upper part and the lower part of the pore plate 20 are covered by stainless steel nets, and the stainless steel nets are fixed on the pore plate 20 by bolts. The stainless steel mesh pore size is 1/4 the nominal diameter of the filter media 19 particles; evenly distributing backwashing nozzles 26 below the stainless steel net, wherein the distance between the nozzles is 300 mm; the backwash pump performs the flushing regeneration of the filter media 19 through the backwash pipe 12. The sedimentation tank 16 is designed according to the retention time of 1.5-2.5 h. The lower part of the mud bucket 25 is provided with a mud discharging port 24, mud is discharged through an external mud suction pump, and a supporting plate 23 is arranged about 500mm away from the bottom and used for supporting the filter tank 18.

EXAMPLE III

The embodiment is further optimized on the basis of the first embodiment.

The back washing spray head 26 comprises a spray head body 26-12 and a spray nozzle body 26-5, the spray nozzle body 26-5 is arranged at the upper end of the spray head main body, a two-way filter and a water stopping device are arranged inside the spray head body 26-12, the water stopping device is arranged at the upper end of the two-way filter, and the two-way filter and the water stopping device are respectively arranged in an accommodating cavity a26-16 and a cavity b26-16 inside the spray nozzle body 26-5; the water stopping device consists of a water transmission rotor 26-11, a spring 26-10 and a water stopping ball 26-9 which are connected in sequence; the bidirectional filter comprises end covers, an inner cylinder 26-3 and an outer cylinder 26-2, the end covers are mounted at two ends of the outer cylinder 26-2, the inner cylinder 26-3 is arranged inside the outer cylinder 26-2, the end covers comprise a bottom end cover 26-1 and a top end cover 26-4, a water outlet is formed in the surface of the top end cover 26-4, a sealing ring b26-14 and a sealing ring c26-15 are further arranged on the outer side surfaces of the bottom end cover 26-1 and the top end cover 26-4, and a nozzle sheet 26-6, a protection sheet 26-7 and a sealing ring a26-8 are sequentially arranged inside the nozzle body 26-5.

Preferably, the bottom end of the spray head body 26-12 is provided with a locking cover 26-13.

The working mode is as follows:

the end of the big circular hole of the nozzle body 26-12 is provided with internal threads matched with the external threads of the locking cover 26-13, and the part of the locking cover 26-13 which is larger than the external diameter of the end cover is provided with 4 equant water inlet holes. One side of the end cover of the two-way filter is provided with a groove for placing a rubber sealing ring, and the other side is provided with a groove matched with the inner cylinder 26-3 with the micropore of the outer cylinder 26-2 with the micropore; a water outlet is processed in the center of the end cover, a groove for placing a rubber sealing ring is processed on one surface of the end cover, and a groove matched with the inner cylinder 26-3 with the micropores of the outer cylinder 26-2 with the micropores is processed on the other surface of the end cover; the bottom end cover 26-1 and the top end cover 26-4 are tightly matched with the outer cylinder 26-2 with the micropores and the inner cylinder 26-3 with the micropores; after being assembled into a whole, the integral spray head is put into a big round hole of the spray head body 26-12 with external threads at the two ends and is locked and fixed by a locking cover 26-13. Thereby realizing the bidirectional filtration of liquid from outside to inside and from inside to outside and the filter which can carry out self-flushing. The sealing water stop ball 26-9 seals the water outlet hole in the center of the end cover under the action of the spring 26-10 to prevent water leakage. The other end of the spring 26-10 is connected with the water transmission rotor 26-11, so that the water transmission rotor 26-11 is pressed against the water outlet at the center of the protection sheet 26-7 under the action of the spring 26-10. Assembled within a small circular bore of a dual-ended externally threaded spray head body 26-12. The inner hole of the nozzle main body with the inner screw thread is processed into 4 inner holes with different diameters from bottom to top, namely a large round hole, a middle round hole, a small round hole and a through hole. The outer end of the big round hole is provided with an internal thread matched with the nozzle body 26-12 with the external thread at the two ends and locked with the nozzle body; the inner diameter of the middle round hole is in sealing fit with the outer diameter of the protection sheet 26-7; the internal thread matched in the small round hole is locked with the internal thread; the inner diameter of the middle round hole is in sealing fit with the outer diameter of the protection sheet 26-7; the inner diameter of the small round hole is in sealing fit with the outer diameter of the nozzle sheet 26-6; the aperture of the central hole of the protection plate 26-7 is 0.4-0.5mm larger than that of the central hole of the nozzle plate 26-6. The aperture of the center of the nozzle sheet 26-6 is 0.1-0.15 mm. The protective sheet 26-7 protects the nozzle pieces 26-6 so that the water transport rotor 26-11 does not directly wear the nozzle pieces 26-6. The aperture of the through hole is 3-4 mm. The liquid is sprayed out through the central hole of the protective plate 26-7 and the central aperture of the nozzle plate 26-6 to form a spiral umbrella-shaped fog column.

Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

The invention has been described above by way of example, and it should be noted that any simple variants, modifications or other equivalent substitutions by a person skilled in the art without spending creative effort may fall within the scope of protection of the present invention without departing from the core of the present invention.

Claims (9)

1. The utility model provides a dust removal filter equipment which characterized in that: comprises a cylinder body (1), a dust removal device arranged at the upper part of the cylinder body (1), a filtering device arranged at the lower part of the cylinder body (1), an air inlet (7) arranged at the side wall of the cylinder body (1) and an air outlet (14) arranged at the top of the cylinder body (1);

the dust removal device comprises a first spraying system arranged on the upper part of the air inlet (7) and a second spraying system arranged on the upper part of the first spraying system, wherein the first spraying system comprises a first spraying pipe (6) and a first nozzle arranged on the first spraying pipe (6);

the second spraying system comprises a filter plate (5), a folding filter screen (4), a second spraying pipe (3) and a second nozzle, the filter plate (5) is arranged at the lower part of the second spraying system, the second spraying pipe (3) is arranged at the upper part of the filter plate (5), the second spraying pipe (3) is provided with the second nozzle, and the folding filter screen (4) is arranged between the second spraying pipe (3) and the filter plate (5);

the filter device comprises a primary filter device and a depth filter device, the primary filter device comprises a filter screen (8), a guide plate (9) and a guide pipe (10), the filter screen (8) is arranged on the lower part of the air inlet (7), the guide plate (9) is arranged on the lower part of the filter screen (8), and the guide pipe (10) is connected to the lower part of the guide plate (9);

the depth filtering device comprises a filtering tank (18), a supporting plate (23) and a mud bucket (25), wherein the filtering tank (18), the supporting plate (23) and the mud bucket (25) are arranged at the lower part of the barrel body (1), the upper part of the mud bucket (25) is connected with the supporting plate (23), the bottom of the filtering tank (18) is fixedly connected with the barrel body (1) through the supporting plate (23), the side wall of the lower part of the barrel body (1) is also provided with a water inlet pipe (11) and a water outlet pipe (13), the water inlet pipe (11) is arranged at the upper part of the water outlet pipe (13), and the water outlet pipe (13) is arranged above the supporting plate (23);

a filtering system and a back-flushing system are arranged in the filtering tank (18), the filtering system comprises a water distributor (17), a pore plate (20), a filtering medium (19), a water conveying pipe (21), a water pump (22) and a circulating pipe (15), the water distributor (17) is arranged at the top of the filtering tank (18), the pore plate (20) is arranged at the lower part of the filtering tank (18), the filtering medium (19) is arranged on the pore plate (20), the water conveying pipe (21) is arranged on the side wall of the lower part of the filtering tank (18), the water conveying pipe (21) is connected with the water pump (22), the other end of the water pump (22) is connected with the water inlet end of the circulating pipe (15), and the water outlet end of the circulating pipe (15) is respectively connected with the first spraying pipe (6; the backwashing system comprises a backwashing spray head (26) and a backwashing pipe (12), the backwashing spray head (26) is arranged at the lower part of the pore plate (20), the backwashing spray head (26) is connected with the backwashing pipe (12), and the backwashing pipe (12) passes through the filtering tank (18) and the side wall of the cylinder body (1) and extends to the outside of the cylinder body (1);

the side wall of the mud bucket (25) is provided with a mud discharging port (24), and the mud discharging port (24) penetrates through the side wall of the barrel body (1) and extends to the outer side of the barrel body (1).

2. A dust-removing filter unit as claimed in claim 1, in which: the sludge discharge port (24) is provided with a sludge suction pump.

3. A dust-removing filter unit as claimed in claim 1, in which: and a dehydration device (2) is arranged in the cylinder body (1), and the dehydration device (2) is arranged at the upper part of the second spraying system.

4. A dust-removing filter unit according to claim 3, wherein: the dehydration device (2) comprises an outer frame body and a water vapor adsorption and filtration ceramic filler, wherein the water vapor adsorption and filtration ceramic filler is filled in the outer frame body.

5. A dust-removing filter unit as claimed in claim 1, in which: the filter medium (19) is one or more of quartz sand, diatomite, manganese sand, ceramsite and activated carbon.

6. A dust-removing filter unit as claimed in claim 1, in which: the perforated plate (20) is covered with a stainless steel mesh, and the pore size of the mesh is 1/4 which is the nominal diameter of the particles of the filter medium (19).

7. A dust-removing filter unit as claimed in claim 1, in which: water inlets with the aperture more than 10 times of the nominal diameter of the particles of the filter medium (19) are uniformly distributed on the water distributor (17), the upper part and the lower part of the water distributor (17) are covered by stainless steel nets, and the stainless steel nets are fixedly connected with the water distributor (17).

8. A dust-removing filter unit as claimed in claim 1, in which: the back washing sprayer (26) comprises a sprayer body (26-12) and a nozzle body (26-5), the nozzle body (26-5) is arranged at the upper end of the sprayer body (26-12), a bidirectional filter and a water stopping device are arranged inside the sprayer body (26-12), the water stopping device is arranged at the upper end of the bidirectional filter, and the bidirectional filter and the water stopping device are respectively arranged in an accommodating cavity a (26-16) and a cavity b (26-17) inside the nozzle body (26-5); the water stopping device consists of a water transmission rotor, a spring (26-10) and a water stopping ball (26-9) which are connected in sequence; the bidirectional filter comprises end covers, an inner barrel (26-3) and an outer barrel (26-2), the end covers are mounted at two ends of the outer barrel (26-2), the inner barrel (26-3) is arranged inside the outer barrel (26-2), the end covers comprise a bottom end cover (26-1) and a top end cover (26-4), a water outlet is formed in the surface of the top end cover (26-4), a sealing ring b (26-14) and a sealing ring c (26-15) are further arranged on the outer side surfaces of the bottom end cover (26-1) and the top end cover (26-4), and a nozzle sheet (26-6), a protection sheet (26-7) and a sealing ring a (26-8) are sequentially arranged inside a nozzle body (26-5).

9. A dust-removing filter unit as claimed in claim 8, in which: the bottom end of the spray head body (26-12) is provided with a locking cover (26-13).