CN113634078A

CN113634078A - Gas dust removal method, application and cyclone dust removal washing tower

Info

Publication number: CN113634078A
Application number: CN202110985270.2A
Authority: CN
Inventors: 伍玉良; 韩培军; 吴简; 叶家泽
Original assignee: Tongwei Solar Meishan Co Ltd
Current assignee: Tongwei Solar Meishan Co Ltd
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2021-11-12

Abstract

The invention relates to a gas dust removal method, application and a cyclone dust removal washing tower, and belongs to the field of tail gas treatment. A gas dedusting method comprises the following steps: the method comprises the following steps: introducing gas to be treated from the lower part of the spraying dust removing space, and spirally lifting the gas in the spraying dust removing space; step two: in the gas rising process, continuously spraying and dedusting the gas to be treated along the gas rising direction through a spraying mechanism; when the gas rises to the top of the spraying dust removal space, the gas is discharged from the gas outlet channel; meanwhile, part of dust contained in the gas is separated from the constraint of the spraying dust removal space under the action of centrifugal force and is discharged to the dust removal space from the outer side of the gas outlet channel; step three: the gas to be treated is subjected to primary dust removal. In the method for removing dust from gas, the gas introduced into the spraying dust removing space forms spiral ascending gas flow, and the spraying mechanism sprays and removes dust for the gas to be treated in the period, so that preliminary dust removal can be realized.

Description

Gas dust removal method, application and cyclone dust removal washing tower

Technical Field

The invention relates to the field of tail gas treatment, in particular to a gas dust removal method, application and a cyclone dust removal washing tower.

Background

In order to reduce the pollution of the finally discharged tail gas to the environment, the tail gas needs to be combusted so as to convert the tail gas into the tail gas containing silicon dioxide and other substances, and then the tail gas is conveyed to a plant-end washing tower for treatment. Lack the processing apparatus to dust in the tail gas among the current tail gas scrubbing tower, lead to in tail gas treatment, the dust is concentrated and is left there is the scrubbing tower back end, and then influences the operation of back end fan, causes the air pressure disorder in the scrubbing tower for the scrubbing tower has the risk of dying.

The existing scrubbing tower generally guides the tail gas into a rotating gas flow for dust removal, so that the gas is fully contacted with spray water, and dust removal is realized. For example, a patent with publication number CN108815961A discloses a fluorite drying tail gas treatment process, which includes a first rotational flow plate and a second rotational flow plate, and fully guides the tail gas to form a rotating and ascending air flow, and then contacts with water sprayed from a spraying device. In the process, the air flow is blocked by the spray water to rise so as to intercept the dust, and the single-stage dust removal mode cannot fully remove the dust at one time, so that the single-stage dust removal mode is only suitable for the working condition that the dust in the comparison document is subjected to preliminary dust removal and most of the dust is removed; water melted with dust can flow through the first cyclone plate and the second cyclone plate, so that the water is easy to remain on the first cyclone plate and the second cyclone plate to influence the subsequent use of the device; in addition, the filter device is additionally arranged for realizing water circulation, the cost is undoubtedly increased by the mode, and the filter device is frequently replaced and maintained as required, so that the labor cost is increased.

Disclosure of Invention

1. Problems to be solved

Aiming at the problem of insufficient dust removal of the existing tail gas washing tower, the invention provides a gas dust removal method, which can realize gas-dust separation on the basis of traditional spraying interception dust removal, effectively reduce the dust content in tail gas and improve the spraying dust removal effect. The gas dust removal method can be well applied to the production process of the solar cell. On the basis of the gas dust removal method, the invention also provides a cyclone dust removal washing tower for realizing the method.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A gas dedusting method comprises the following steps:

the method comprises the following steps: introducing gas to be treated from the lower part of the spraying dust removing space, and spirally lifting the gas in the spraying dust removing space;

step two: in the gas rising process, continuously spraying and dedusting the gas to be treated along the gas rising direction through a spraying mechanism; when the gas rises to the top of the spraying dust removal space, the gas is discharged from the gas outlet channel; meanwhile, part of dust contained in the gas is separated from the constraint of the spraying dust removal space under the action of centrifugal force and is discharged to the dust removal space from the outer side of the gas outlet channel;

step three: the gas to be treated is subjected to primary dust removal.

Preferably, the gas after the third step is sprayed and dedusted again for at least one time.

Preferably, the waste water generated by the subsequent spraying and dust removal is used for spraying and dust removal of the dust separated in the step two.

Preferably, the treated gas is exhausted after being dried.

Preferably, the waste water generated by spraying and dedusting is used for circulating spraying after natural sedimentation and purification.

Preferably, the gas dust removal method is applied to treatment of tail gas generated in the production process of solar cells.

A cyclone scrubber tower comprising:

the tower body is internally provided with a spraying dust removal space and a gas outlet after dust removal;

the air inlet unit is communicated with the spraying dust removal space;

the first spraying mechanism is positioned in the spraying dust removal space and is used for spraying dust removal;

the gas inlet unit is used for enabling gas introduced into the spraying dust removal space to form spiral ascending gas flow; the spraying and dedusting space is provided with an air outlet channel for the gas sprayed and dedusted by the first spraying mechanism to flow out and a dust channel which is positioned outside the air outlet channel and used for discharging separated dust;

the dust collection device also comprises a dust collection space which is positioned outside the spraying dust collection space in the tower body and is communicated with a dust channel of the spraying dust collection space. Preferably, the tower body is provided with a cylindrical spray cylinder with an opening at the upper side, the inner space and the outer space of the spray cylinder respectively form a spray dust removal space and a dust collection space, the opening at the upper side is close to the middle part to form an air outlet channel, and the opening at the two sides is close to form a dust channel; the first spraying mechanism is arranged below the air outlet channel in the spraying barrel.

Preferably, the air inlet unit comprises an air inlet pipe communicated with the lower side inside the spray cylinder, and an air inlet of the air inlet pipe is arranged along the tangential direction of the cross section of the spray cylinder.

Preferably, the first spraying mechanism comprises a plurality of groups of first spray heads arranged along the ascending direction of the airflow, and can spray and remove dust to the periphery; the arrangement diameter of the multiple groups of first spray heads along the ascending direction of the airflow gradually increases.

Preferably, a baffle plate for separating the space in the tower from top to bottom is arranged above the spray cylinder in the tower body; the air outlet channel is arranged on the baffle plate;

the second spraying mechanism is positioned above the baffle plate in the tower body and is used for spraying and dedusting the gas discharged from the gas outlet channel; and the baffle plate is provided with a lower water discharge port for the second spraying mechanism to spray water to flow out, and the lower water discharge port is communicated with a dust collection space.

Preferably, a water retaining cap for preventing water from flowing in is arranged above the air outlet channel.

Preferably, a sealing layer for sufficiently contacting gas and water is disposed between the second spraying mechanism and the baffle plate.

Preferably, the tight-fit layer is a Raschig ring arranged above the tower body.

Preferably, a drying layer is arranged in front of the exhaust port of the gas in the tower body and used for drying the treated gas.

Preferably, the drying layer is a pall ring disposed above the tower body.

Preferably, the dust collecting device further comprises a water collecting tank for collecting dust-removing sewage in the spraying dust-removing space and the dust-collecting space.

Preferably, the water collecting tank is divided into a sewage area and a clear water area which are communicated through an overflow channel; the dust-removing sewage in the spraying dust-removing space and the dust-absorbing space enters a sewage area of the water collecting tank;

the device also comprises a circulating water supply system, and water in the clear water area of the collecting tank is extracted to supply the spraying mechanism with spraying water.

Preferably, a first baffle plate extends upwards from the bottom of the collecting tank, and a second baffle plate is inserted into the tank from the upper part of the collecting tank and is close to the bottom of the tank, and an overflow channel is formed between the first baffle plate and the second baffle plate.

Preferably, a sewage area in the water collecting tank is provided with a sewage discharge pipe, and a clear water area is provided with a water replenishing pipe.

Preferably, the circulating water supply system comprises a communicating pipe for communicating the clean water area of the collecting tank with the spraying mechanism, and a water pump is arranged on the communicating pipe.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

(1) in the method for removing dust from gas, the gas introduced into the spraying dust removing space forms spiral ascending gas flow, and the spraying mechanism sprays and removes dust for the gas to be treated in the period, so that preliminary dust removal can be realized; and partial dust in the spirally-rising gas to be treated can be separated from the constraint of the spraying dust removal space under the action of centrifugal force and is discharged to the dust removal space, so that gas-dust separation is realized, gas dust removal is further realized, and the dust removal effect is enhanced.

(2) According to the gas dust removal method, the gas subjected to preliminary spray dust removal and gas-dust separation type dust removal is subjected to at least one spray dust removal, so that dust in the gas can be removed more thoroughly, and the waste water obtained by spray dust removal can be used for removing the dust separated in the gas-dust separation stage, so that the dust removal step is simplified on the premise of ensuring the dust removal effect; in addition, the waste water generated by spraying and dedusting can be used for circular spraying after natural sedimentation, so that the water resource is fully utilized.

(3) In the cyclone dust removal washing tower, the gas inlet unit guides the spiral ascending gas flow formed by the gas entering the spraying dust removal space, and preliminary spraying dust removal is realized through the first spraying mechanism; and part of unremoved dust continuously rises along with the spirally rising air flow and can be separated from the constraint of the spraying dust removal space under the action of centrifugal force, and then enters the dust removal space to realize gas-dust separation, so that a large amount of dust can be prevented from rising along with the air flow, the dust content in the continuously rising air flow is reduced, and a better dust removal effect is achieved.

(4) The air inlet unit in the cyclone dust removal washing tower can guide tail gas entering the spraying dust removal space to form conical rotating airflow with a wide top and a narrow bottom, and the arrangement diameters of a plurality of groups of first spray nozzles in the first spraying mechanism matched with the air inlet unit are gradually increased along the ascending direction of the airflow, so that the first spray nozzles are always positioned at the dense part of dust in the airflow, and water mist can be fully contacted with gas without barriers such as a cyclone plate, and a better dust removal effect is achieved.

(5) According to the cyclone dust removal washing tower, the water collecting tank for absorbing dust is arranged below the tower body and is communicated with the spraying dust removal space and the dust collection space, and the water resource recycling is realized by matching with a circulating water supply system; and the overflow channel that sets up is close to circulation water supply system one side at the catch basin, utilizes the natural sediment of aquatic dust to divide into sewage district and clear water district with the catch basin, has guaranteed that the water in clear water district just can flow in circulation water supply system, does not need filter equipment just to make the circulating water keep pure promptly, the cost is reduced.

Drawings

FIG. 1 is a two-dimensional view of the present invention.

In the figure:

1. a tower body;

2. spraying a dust removal space;

3. an air intake unit; 31. an air inlet pipe;

4. a first spraying mechanism; 41 a first nozzle;

5. a dust collection space; 6. an air outlet channel;

7. a spray cylinder;

8. a second spraying mechanism; 81. a second nozzle;

9. a baffle plate; 10. a lower drainage port;

11. a sealing layer;

12. drying the layer;

13. a water collecting tank;

14. a circulating water supply system; 141. a communicating pipe; 142. a water pump;

15. an overflow channel; 151. a first separator; 152. a second separator;

16. a blow-off pipe;

17. a water replenishing pipe.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the embodiment.

Example 1

As shown in fig. 1, the cyclone dust removal washing tower of the embodiment comprises a tower body 1, wherein a spray dust removal space 2 is arranged inside the tower body 1, preliminary dust removal is realized in the spray dust removal space 2 through spray water, and an outlet for exhausting gas after dust removal is also arranged; the tower body 1 is also internally provided with a dust collection space 5 positioned outside the spraying dust removal space 2 and communicated with a dust channel of the spraying dust removal space 2. Specifically, the outlet of the tower body 1 can be connected with a draught fan and a discharge chimney through a connecting air pipe and a collecting air pipe, tail gas processed by the tower body 1 is converged in the collecting air pipe through the connecting air pipe, and then is guided to the discharge chimney by the draught fan to be discharged into the atmosphere.

The tower body 1 is provided with an air inlet unit 3 communicated with the spraying dust removing space 2, and the air inlet unit 3 guides air to enter the spraying dust removing space 2. The spraying and dust removing space 2 is formed by the inner space of a spraying cylinder 7 arranged in the tower body 1, a first spraying mechanism 4 for spraying and dust removing is arranged in the spraying and dust removing space 2, the first spraying mechanism 4 comprises a plurality of groups of first spray heads 41 which are arranged along the ascending direction of the air flow and can spray to the periphery, so that spraying water mist is contacted with dust in the ascending air flow, and the dust removing effect is achieved; specifically, the spray cylinder 7 is fixedly connected inside the tower body 1 through connecting pieces such as a connecting plate, the first spray mechanism 4 comprises a first water supply pipe, a plurality of transverse pipes which are symmetrically or annularly distributed along the center line of the first water supply pipe are fixedly connected to the side face of the first water supply pipe, and the end part of each transverse pipe is connected with the first spray head 41.

In order to make the spraying water mist of the first spraying mechanism 4 contact with the dust in the air flow more fully, the air inlet unit 3 is required to form the air entering the spraying dust removing space 2 into a spiral ascending air flow so as to increase the contact time and the contact area between the dust in the air flow and the spraying water mist. Therefore, the air inlet unit 3 is provided, and comprises an air inlet pipe 31 communicated with the inner part of the spray cylinder 7 and close to the lower side, and an air inlet of the air inlet pipe 31 is arranged along the tangential direction of the cross section of the spray cylinder 7. Specifically, the air inlet pipe 31 penetrates through the spray cylinder 7 and the tower body 1 and is fixedly connected with the spray cylinder 7 and the tower body 1, and an air inlet of the air inlet pipe 31 can be connected with a tail gas sending device through connecting pieces such as flanges. In the scheme, the airflow is guided through the air inlet pipe 31, blown into the cylinder along the tangent position of the spraying cylinder 7, guided by the deflection of the cylinder wall, accelerated rotated in the cylinder, and driven by pressure because the abutting section is positioned at the upper outlet, and the airflow is in a spiral rising shape. In another possible embodiment, the gas inlet unit 3 comprises a swirl guide plate arranged inside the spray cylinder 7 and a gas inlet pipe 31 positioned below the swirl guide plate, wherein the gas inlet pipe 31 introduces gas into the spray cylinder 7, and the gas rises through the swirl guide plate to form a spiral ascending gas flow. There are of course other implementations in which the spiral updraft resembles a tornado, with a vertically wide-down trapezoidal shape in cross-section.

Corresponding to the spiral ascending air flow, the arrangement diameter of the multiple groups of first spray nozzles 41 along the ascending direction of the air flow is gradually increased, so that spray water of the first spray nozzles 41 and dust in the spiral ascending air flow are always in a sufficient contact state, and a better dust removal effect is achieved; specifically, the length of the cross pipe communicating the first water supply pipe and the first nozzle 41 is gradually increased in the ascending direction.

An opening is arranged at the upper side of the spray cylinder 7, a baffle plate 9 for separating the space in the tower body 1 from the upper part and the lower part is fixedly connected above the tower body 1, and an air outlet channel 6 is arranged on the baffle plate 9 for the outflow of the dedusted air flow; a second spraying mechanism 8 comprising one or more second spray nozzles 81 is arranged above the baffle plate 9, and further spraying and dedusting are carried out on the gas flowing out of the gas outlet channel 6; the second spraying mechanism 8 comprises a second water supply pipe communicated with the first water supply pipe, and the second water supply pipe is connected with the second spray head 81; in order to prevent the water sprayed by the second spraying mechanism 8 from colliding with the spirally ascending air flow to influence the ascending of the air flow, a water retaining cap is arranged above the air outlet channel 6. The air outlet channel 6 can be an air outlet cylinder facing the outlet of the spray cylinder 7, and in order to guide the air flow to smoothly rise through the air outlet channel, the diameter of the air outlet cylinder is not less than the maximum arrangement diameter of the first spray head 41.

In a general washing tower device, dust which is not removed by water mist is easy to continuously rise along with ascending air flow, and the dust may be accumulated at the top of the tower body 1 to influence dust removal. Therefore, the dust collection space 5 for separating the powder and the air is arranged outside the spraying dust collection space 2. Dust collecting space 5 comprises the outer space of shower 7, and when the helical air current in the shower 7 rose to shower 7 opening edge, lost the constraint, diffusion entering dust collecting space 5 under the effect of centrifugal force to realized the dust separation, carried out solitary processing to the dust that has separated again, it is higher than in the past simply through mode efficiency such as multistage spray dust removal. For the absorption treatment of dust in the dust absorption space 5, the baffle 9 is provided with a lower drainage port 10 for the wastewater after dust removal sprayed by the second spraying mechanism 8 to flow out, and the wastewater enters the dust absorption space 5 to absorb separated dust, thereby realizing the multiple utilization of spraying water.

In order to remove the dust more sufficiently, an adhesion layer is provided between the second shower mechanism 8 and the baffle plate 9 to allow the gas and water to sufficiently contact each other, thereby removing the dust more sufficiently. Wherein the tight-joint layer comprises a first support net connected with the tower body 1 and the water retaining cap, the first support net can be used for water flow to pass through, and the first support net is connected with a first filling layer, preferably a Raschig ring.

Gas will flow out of the tower body 1 finally, and at this time, because gas and spray water are contacted for many times, a large amount of moisture is contained in the gas, and the tail gas cannot meet the emission standard, so that the drying layer 12 is arranged in the tower body 1 before the gas is discharged, and the gas after treatment is dried. The drying layer 12 comprises a second support network connected to the tower 1, to which a second tight-fitting layer, preferably a pall ring, is connected.

In order to remove the dust in the waste water formed in the above-mentioned multiple stages, a collecting tank 13 is provided below the tower body 1 for collecting the dust-removing waste water in the spray dust-removing space 2 and the dust-collecting space 5. Wherein the water collecting tank 13 can be separately arranged with the tower body 1 and fixedly connected through a connecting piece, and can also be integrally formed with the tower body 1. A first partition plate 151 extends upwards from the bottom of the collecting tank 13, and a second partition plate 152 is inserted from the upper part of the collecting tank 13, and an overflow channel 15 is formed between the first partition plate 151 and the second partition plate 152. The overflow channel 15 divides the water collecting tank 13 into a sewage area and a clear water area by utilizing the natural sedimentation of dust, and the sewage area and the clear water area are communicated through the overflow channel 15; meanwhile, the dust-removing sewage formed by the spraying dust-removing space 2 and the dust-absorbing space 5 enters the sewage area of the water-collecting tank 13, and after dust is naturally precipitated, cleaner water flows into the clean water area through the overflow passage 15. And a circulating water supply system 14 connected with the clear water area of the collecting tank 13 is further arranged and used for extracting water in the clear water area of the collecting tank 13 for the spraying mechanism to spray water, so that the water is recycled. The circulating water supply system 14 comprises a communicating pipe 141 for communicating the collecting tank 13 with the spraying mechanism, and a water pump 142 is arranged in the middle of the pipeline, so that clean water in the collecting tank 13 is conveyed to the spraying mechanism; specifically, the first water supply pipe communicates with the second water supply pipe, and the communication pipe 141 in the circulating water supply system 14 communicates with the first water supply pipe and the second water supply pipe. Of course, both the first spraying mechanism 4 and the second spraying mechanism 8 can be supplied with water by water sources.

In order to realize thorough water circulation, a drain pipe 16 is arranged at the bottom of the water collecting tank 13 and used for discharging sludge deposited at the bottom of the water collecting tank 13, and in addition, a water replenishing pipe 17 is arranged at the position of the clean water area of the water collecting tank 13 and used for replenishing water for the clean water area of the water collecting tank 13 in time due to certain water consumption in the water circulation process.

In the embodiment, when tail gas is treated, the tail gas is firstly guided into the spraying cylinder 7 through the water inlet pipe 31, the tail gas is deflected and guided by the cylinder wall to form spiral ascending air flow, and the first spraying mechanism 4 in the spraying cylinder 7 sprays water mist through the first spray head 41 to realize primary dust removal; the spiral ascending airflow continuously ascends to the edge of an upper opening of the spray cylinder 7 and loses constraint, so that the spiral ascending airflow is diffused into the dust collection space 5, gas-dust separation is realized, secondary dust collection is completed, and the residual purer gas continuously ascends along the gas outlet channel 6; the gas flowing out through the gas outlet channel 6 is dispersed to the periphery along the water retaining cap, at the moment, the water sprayed by the second spraying mechanism 8 passes through the tight-joint layer 11 to further spray and remove dust on the gas, so that the three-stage dust removal is completed, wherein the residual dust removal wastewater flows into a dust collection space through the lower water discharge port 10 on the baffle plate 9, and further the dust separated in the two-stage dust removal is removed; the residual gas in the third-stage dust removal continuously rises to the close connection layer 11, the close connection layer 11 realizes more thorough four-stage dust removal by increasing the contact area of the spraying water mist and the gas, wherein the four-stage dust removal and the third-stage dust removal are carried out synchronously; the final gas passes through the drying layer 12 before exiting the tower 1 to remove water mist components contained in the gas and to achieve a predetermined discharge standard.

Example 2

This example provides a gas dedusting method for removing dust from a gas using the cyclone scrubber of example 1, and the process is described in more detail below.

The method comprises the following steps: gas to be treated is introduced into the spraying and dust removing space 2 formed by the spraying barrel 7 through the gas inlet unit 3, the gas is blown into the barrel along the tangential position of the spraying barrel 7 and is guided by the deflection of the barrel wall, and the gas flow rotates in the barrel at an accelerated speed to form spiral rising gas flow.

Step two: the first spraying mechanism 4 located in the spraying dust removal space 2 continuously sprays water mist to the gas to be treated along the gas ascending direction, the spraying water mist is contacted with the gas flow, and then the dust in the gas is absorbed, and meanwhile, when the spirally ascending gas flow ascends to the top edge of the spraying barrel 7, part of contained dust is separated from the constraint of the spraying dust removal space 2 and enters the dust collection space 5 from the outer side of the gas outlet channel 6, so that further separation and dust removal are realized.

Step three: and (4) processing the gas in the first step and the second step to obtain primary dust removal.

Step four: and (4) spraying and dedusting the gas after the third step for at least one time, namely, the gas rises along the gas outlet channel 6, and spraying and dedusting the gas for the second time by a second spraying mechanism 8 arranged above the baffle plate 9. And the sewage obtained in the period enters the dust collection space 5 in the step two, and the separated dust is subjected to spray dust removal, so that the reutilization of spray water is realized.

Step five: the gas obtained in the fourth step passes through a drying layer 12 provided at the outlet of the tower body 1 before being discharged, and water mist components contained in the gas are removed to meet a predetermined discharge standard.

Step six: and (4) allowing the dedusting sewage obtained in the first step to the fifth step to flow into a water collecting tank 13 positioned below the tower body 1, performing natural sedimentation in the water collecting tank 13, and circularly conveying the obtained clean water to a spraying mechanism, so that circular spraying is realized.

In summary, in the gas dust removal method of the present embodiment, firstly, gas is introduced into the spraying dust removal space 2 to form a spiral ascending gas flow, and then the spraying mechanism is used to spray and remove dust from the gas; meanwhile, under the action of centrifugal force of the spirally-rising gas to be treated, part of dust is separated and enters the dust collection space 5; in addition, the purer gas is subjected to at least one other spraying dedusting, and the obtained spraying sewage enters the dust collection space 5 to realize the spraying dedusting of the separated dust; the final gas is dried to remove water mist components before being discharged. The dedusting sewage generated in the gas treatment process finally enters the water collecting tank 13, natural sedimentation is carried out in the water collecting tank 13, the obtained clean water is conveyed back to the spraying mechanism to realize circular water supply, and water resources, manpower and material resource costs are saved.

Example 3

The embodiment provides an application of the gas dust removal method in embodiment 2 in tail gas treatment generated in the production process of solar cells. The tail gas generated in the production process of the solar cell panel contains a large amount of dust, and if dust is not removed, the tail gas cannot reach the specified emission standard, so that the environment is polluted. Therefore, tail gas generated in the production process of the solar cell panel is used as gas to be treated and introduced into the spraying and dedusting space 2, the specific treatment steps are basically the same as those in the embodiment 2, and finally, dust in the gas can be fully removed to enable the dust to reach the emission standard.

In the description of this patent, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the patent.

In this patent, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which shall fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A gas dedusting method comprises the following steps:

the method comprises the following steps: introducing gas to be treated from the lower part of the spraying dust removing space (2), and spirally lifting the gas in the spraying dust removing space (2);

step two: in the gas rising process, continuously spraying and dedusting the gas to be treated along the gas rising direction through a spraying mechanism; when the gas rises to the top of the spraying dust removing space (2), the gas is discharged from the gas outlet channel (6); meanwhile, part of dust contained in the gas is separated from the constraint of the spraying dust removal space (2) under the action of centrifugal force and is discharged to the dust collection space (5) from the outer side of the gas outlet channel (6);

step three: the gas to be treated is subjected to primary dust removal.

2. A gas dedusting method as recited in claim 1, characterized in that: and D, spraying and dedusting the gas subjected to the third step for at least one time.

3. A gas dedusting method as recited in claim 2, characterized in that: and D, spraying and dedusting the dust separated in the step II by using wastewater generated by subsequent spraying and dedusting.

4. A gas dedusting method as recited in claim 1, 2, or 3, characterized in that: the treated gas is dried and discharged.

5. A gas dedusting method as recited in claim 1, 2, or 3, characterized in that: the waste water generated by spraying and dedusting is used for circulating spraying after natural sedimentation and purification.

6. Use of the gas dedusting method according to any of the claims 1-5 in the treatment of off-gas generated during the production of solar cells.

7. A cyclone scrubber tower comprising:

the tower body (1) is internally provided with a spraying dust removal space (2) and a gas outlet after dust removal;

the air inlet unit (3) is communicated with the spraying and dedusting space (2);

the first spraying mechanism (4) is positioned in the spraying dust removal space (2) and is used for spraying dust removal;

the device is characterized in that the gas inlet unit (3) is used for enabling gas introduced into the spraying and dust removing space (2) to form spiral ascending gas flow; the spraying and dedusting space (2) is provided with an air outlet channel (6) through which the gas sprayed and dedusted by the first spraying mechanism (4) flows out and a dust channel which is positioned outside the air outlet channel (6) and used for discharging separated dust;

the dust collection tower further comprises a dust collection space (5) which is positioned outside the spraying dust collection space (2) in the tower body (1) and is communicated with a dust channel of the spraying dust collection space (2).

8. A cyclone scrubber tower as recited in claim 7, wherein: the tower body (1) is provided with a cylindrical spray cylinder (7) with an opening at the upper side, the inner space and the outer space of the spray cylinder (7) respectively form a spray dust removal space (2) and a dust collection space (5), the upper side of the spray cylinder is opened close to the middle to form an air outlet channel (6), and the upper side of the spray cylinder is opened close to the two sides to form a dust channel; the first spraying mechanism (4) is arranged below the air outlet channel (6) in the spraying barrel (7).

9. A cyclone scrubber tower as recited in claim 8, wherein: the air inlet unit (3) comprises an air inlet pipe (31) communicated with the inner part of the spray cylinder (7) and close to the lower side, and an air inlet of the air inlet pipe (31) is arranged along the tangential direction of the cross section of the spray cylinder (7).

10. A cyclone scrubber tower as recited in claim 7, wherein: the first spraying mechanism (4) comprises a plurality of groups of first spray heads (41) which are arranged along the ascending direction of the airflow and can spray and remove dust to the periphery; the arrangement diameter of the plurality of groups of first spray heads (41) along the ascending direction of the airflow is gradually increased.

11. A cyclone scrubber tower as recited in claim 8, wherein: in the tower body (1), a baffle plate (9) for separating the space in the tower from top to bottom is arranged above the spray cylinder (7); the air outlet channel (6) is arranged on the baffle plate (9);

the second spraying mechanism (8) is positioned above the baffle plate (9) in the tower body (1) and is used for spraying and dedusting the gas discharged from the gas outlet channel (6); the baffle plate (9) is provided with a lower drainage port (10) for the second spraying mechanism (8) to spray water to flow out, and the lower drainage port (10) is communicated with the dust collection space (5).

12. A cyclone scrubber tower as recited in claim 11, wherein: a water retaining cap for avoiding water from flowing in is arranged above the air outlet channel (6).

13. A cyclone scrubber tower as recited in claim 11, wherein: and a close-joint layer (11) for fully contacting gas and water is arranged between the second spraying mechanism (8) and the baffle plate (9).

14. A cyclone scrubber tower as recited in claim 13, wherein: the tight-joint layer (11) is a Raschig ring arranged above the tower body (1).

15. A cyclone scrubber tower as recited in claim 11, wherein: a drying layer (12) is arranged in front of the gas outlet in the tower body (1) and used for drying the treated gas.

16. A cyclone scrubber tower as recited in claim 15, wherein: the drying layer (12) is a pall ring arranged above the tower body (1).

17. A cyclone scrubber tower as recited in claim 7, wherein: and the dust collecting tank (13) is used for collecting dust-removing sewage in the spraying dust-removing space (2) and the dust-collecting space (5).

18. A cyclone scrubber tower as recited in claim 17, wherein: the water collecting tank (13) is divided into a sewage area and a clear water area which are communicated through an overflow channel (15); the dust-removing sewage in the spraying dust-removing space (2) and the dust-absorbing space (5) enters a sewage area of a water collecting tank (13);

the device also comprises a circulating water supply system (14) for pumping water in a clear water area of the water collecting tank (13) for spraying water of the spraying mechanism.

19. A cyclone scrubber tower as recited in claim 18, wherein: a first baffle (151) extends upwards from the bottom of the collecting tank (13), and a second baffle (152) which is inserted into the tank from the upper part of the collecting tank (13) and is close to the bottom of the tank, wherein an overflow channel (15) is formed between the first baffle (151) and the second baffle (152).

20. A cyclone scrubber tower as recited in claim 18, wherein: and a sewage discharge pipe (16) is arranged in a sewage area in the water collecting tank (13), and a water replenishing pipe (17) is arranged in a clear water area.

21. A cyclone scrubber tower as recited in claim 18, wherein: the circulating water supply system (14) comprises a communicating pipe (141) for communicating the clean water area of the water collecting tank (13) with the spraying mechanism, and a water pump (142) is arranged on the communicating pipe (141).