A gas dust removal method, application and cyclone dust removal washing tower

Abstract

The present invention relates to a gas dust removal method, application and cyclone dust removal washing tower, belonging to the field of tail gas treatment. A gas dust removal method, the steps of which include: step one: introducing the gas to be treated from the lower part of the spray dust removal space, and making the gas spirally rise in the spray dust removal space; step two: during the rising process of the gas, the gas to be treated is continuously sprayed and dusted along the rising direction of the gas by a spray mechanism; when the gas rises to the top of the spray dust removal space, the gas is discharged from the gas outlet channel; at the same time, part of the dust contained in the gas, under the action of centrifugal force, breaks away from the constraints of the spray dust removal space, and is discharged from the outside of the gas outlet channel to the dust suction space; step three: the gas to be treated is initially dusted. In the gas dust removal method of the present invention, the gas introduced into the spray dust removal space forms a spiral rising airflow, during which the spray mechanism sprays and dusts the gas to be treated, and initial dust removal can be achieved.

Description

Technical Field

[0001] The invention relates to the field of tail gas treatment, and in particular to a gas dust removal method, application and a cyclone dust removal washing tower. Background Art

[0002] During the production of solar cells, tail gas containing silane and ammonia is generated. In order to reduce the pollution of the final exhaust gas to the environment, the exhaust gas needs to be burned to convert it into exhaust gas containing silicon dioxide and other substances, and then transported to the factory end washing tower for treatment. The existing exhaust gas washing tower lacks a treatment device for dust in the exhaust gas, resulting in dust being concentrated in the rear section of the washing tower during the exhaust gas treatment, which in turn affects the operation of the rear fan, causing air pressure disturbance in the washing tower, and making the washing tower at risk of downtime.

[0003] In order to remove dust, the existing washing tower usually guides the exhaust gas into a rotating airflow so that the gas is fully in contact with the spray water, thereby achieving dust removal. For example, a patent with a publication number of CN108815961A discloses a fluorite drying exhaust gas treatment process, which is provided with a first cyclone plate and a second cyclone plate, which fully guides the exhaust gas to form a rotating upward airflow, and then contacts the water sprayed by the spray device. However, in this process, the rising airflow is blocked by spraying water alone, thereby intercepting dust. This single-stage dust removal method cannot fully remove dust at one time, and can only be applied to the working conditions described in the comparative document that have undergone preliminary dust removal and removed most of the dust; and the water with dust will flow through the first cyclone plate and the second cyclone plate, so it is easy to remain on the first cyclone plate and the second cyclone plate, affecting the subsequent use of the device; in addition, the comparative document adds a filter device to achieve water circulation. This method undoubtedly increases the cost, and the filter device needs to be replaced and repaired frequently, increasing labor costs. Summary of the invention

[0004] 1. Problems to be solved

[0005] In view of the problem that the existing tail gas scrubber has insufficient dust removal, the present invention provides a gas dust removal method, which can realize gas-dust separation on the basis of traditional spray interception dust removal, effectively reduce the dust content in the tail gas, and improve the spray dust removal effect. The gas dust removal method can be well applied in the production process of solar cells. Based on the gas dust removal method, the present invention also provides a cyclone dust removal scrubber to implement the method.

[0006] 2. Technical solution

[0007] To solve the above problems, the present invention adopts the following technical solutions.

[0008] A gas dust removal method, the steps comprising:

[0009] Step 1: introduce the gas to be treated from the lower part of the spray dust removal space, and make the gas spirally rise in the spray dust removal space;

[0010] Step 2: During the rising process of the gas, the spray mechanism continuously sprays and dusts the gas to be treated along the rising direction of the gas; when the gas rises to the top of the spray dust removal space, the gas is discharged from the gas outlet channel; at the same time, part of the dust contained in the gas is freed from the constraints of the spray dust removal space under the action of centrifugal force and discharged from the outside of the gas outlet channel to the dust suction space;

[0011] Step 3: The gas to be treated is initially dust-removed.

[0012] Preferably, the gas after step 3 is sprayed for dust removal at least once again.

[0013] Preferably, the dust separated in step 2 is sprayed with wastewater generated by subsequent spray dust removal.

[0014] Preferably, the treated gas is discharged after being dried.

[0015] Preferably, the wastewater generated by the spray dust removal is used for circulating spraying after natural sedimentation and purification.

[0016] Preferably, the gas dust removal method is used in the treatment of tail gas generated in the production process of solar cells.

[0017] A cyclone dust removal washing tower, comprising:

[0018] The tower body has a spray dust removal space inside and an outlet for the gas after dust removal;

[0019] Air intake unit, connected to the spray dust removal space;

[0020] The first spray mechanism is located in the spray dust removal space and is used for spray dust removal;

[0021] The air inlet unit is used to make the gas entering the spray dust removal space form a spiral upward airflow; the spray dust removal space has an air outlet channel for the gas after the first spray mechanism sprays and removes dust to flow out, and a dust channel located outside the air outlet channel for the separated dust to be discharged;

[0022] It also includes a dust suction space, which is located outside the spray dust removal space in the tower body and is connected to the dust passage of the spray dust removal space. Preferably, the tower body is provided with a cylindrical spray cylinder with an upper opening, and the inner and outer spaces of the spray cylinder form a spray dust removal space and a dust suction space respectively, and the upper opening forms an air outlet channel in the middle and dust channels on both sides; the first spray mechanism is arranged below the air outlet channel in the spray cylinder.

[0023] Preferably, the air intake unit comprises an air intake pipe connected to the lower side of the interior of the spray cylinder, and the air intake of the air intake pipe is arranged along the tangent direction of the cross section of the spray cylinder.

[0024] Preferably, the first spray mechanism includes a plurality of groups of first nozzles arranged along the ascending direction of the airflow, which can spray and remove dust in all directions; the arrangement diameters of the plurality of groups of first nozzles along the ascending direction of the airflow gradually increase.

[0025] Preferably, in the tower body, a baffle is provided above the spray barrel to separate the space in the tower from top to bottom; and the air outlet channel is provided on the baffle;

[0026] It also includes a second spray mechanism, which is located above the baffle plate in the tower body and sprays and removes dust on the gas discharged from the air outlet channel; a lower drain outlet is provided on the baffle plate for the second spray mechanism to spray water out, and the lower drain outlet is connected to the dust suction space.

[0027] Preferably, a water retaining cap is provided above the air outlet channel to prevent water from flowing in.

[0028] Preferably, a close contact layer is arranged between the second spray mechanism and the baffle plate to enable the gas and water to fully contact each other.

[0029] Preferably, the close contact layer is a Raschig ring arranged above the tower body.

[0030] Preferably, a drying layer is provided before the gas discharge port in the tower body to dry the treated gas.

[0031] Preferably, the drying layer is a ball ring arranged above the tower body.

[0032] Preferably, it also includes a water collection tank for collecting dust removal wastewater in the spray dust removal space and the dust suction space.

[0033] Preferably, the water collection tank is divided into a sewage area and a clean water area, which are connected by an overflow channel; the dust removal sewage in the spray dust removal space and the dust suction space enters the sewage area of ​​the water collection tank;

[0034] It also includes a circulating water supply system that draws water from the clear water area of ​​the collection tank to supply water for spraying by the spraying mechanism.

[0035] Preferably, a first baffle extends upward from the bottom of the water collecting pool, and a second baffle is inserted from above the water collecting pool into the pool close to the bottom of the pool, and an overflow channel is formed between the first baffle and the second baffle.

[0036] Preferably, the sewage area in the water collection tank is provided with a sewage pipe, and the clean water area is provided with a water supply pipe.

[0037] Preferably, the circulating water supply system comprises a connecting pipe connecting the clean water area of ​​the water collection tank with the spray mechanism, and a water pump is provided on the connecting pipe.

[0038] 3. Beneficial effects

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] (1) In the gas dust removal method of the present invention, the gas introduced into the spray dust removal space forms a spiral rising airflow, during which the spray mechanism sprays the treated gas for dust removal, thereby achieving preliminary dust removal; and part of the dust in the spirally rising gas to be treated can be freed from the constraints of the spray dust removal space under the action of centrifugal force and discharged into the dust suction space, thereby achieving gas-dust separation, further achieving gas dust removal, and enhancing the dust removal effect.

[0041] (2) The gas dust removal method of the present invention can more thoroughly remove dust in the gas after preliminary spray dust removal and gas-dust separation dust removal by spray dust removal at least once, and the wastewater obtained by spray dust removal can remove the dust separated in the gas-dust separation stage, thereby simplifying the dust removal steps while ensuring the dust removal effect; in addition, the wastewater generated by spray dust removal can be used for circulating spraying after natural sedimentation, thereby realizing full utilization of water resources.

[0042] (3) In the cyclone dust removal and washing tower of the present invention, the air intake unit guides the gas entering the spray dust removal space to form a spiral rising airflow, and realizes preliminary spray dust removal through the first spray mechanism; and part of the dust that is not removed continues to rise with the spiral rising airflow and will break away from the constraints of the spray dust removal space under the action of centrifugal force, and then enter the dust suction space to realize gas-dust separation, which can prevent a large amount of dust from rising with the airflow, reduce the dust content in the continuously rising airflow, and achieve a better dust removal effect.

[0043] (4) The air intake unit in the cyclone dust removal washing tower of the present invention can guide the exhaust gas entering the spray dust removal space to form a conical rotating airflow that is wide at the top and narrow at the bottom. The arrangement diameters of the multiple groups of first nozzles in the first spray mechanism arranged in conjunction with the air intake unit gradually increase along the rising direction of the airflow, so that the first nozzles are always in the dust-dense area in the airflow, and the water mist and gas can be fully contacted without obstructions such as swirl plates, thereby achieving a better dust removal effect.

[0044] (5) The cyclone dust removal and washing tower of the present invention is provided with a water collecting pool for absorbing dust under the tower body, which is connected to the spray dust removal space and the dust suction space, and cooperates with the circulating water supply system to realize the recycling of water resources; and an overflow channel is arranged on the side of the water collecting pool close to the circulating water supply system, and the water collecting pool is divided into a sewage area and a clean water area by utilizing the natural precipitation of dust in the water, thereby ensuring that the water in the clean water area will flow into the circulating water supply system, that is, the circulating water can be kept pure without the need for a filtering device, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a two-dimensional diagram of the present invention.

[0046] In the figure:

[0047] 1. Tower body;

[0048] 2. Spray dust removal space;

[0049] 3. Air intake unit; 31. Air intake pipe;

[0050] 4. a first spray mechanism; 41 a first spray head;

[0051] 5. Dust collection space; 6. Air outlet channel;

[0052] 7. Spray barrel;

[0053] 8. Second spray mechanism; 81. Second spray head;

[0054] 9. Baffle plate; 10. Lower drain outlet;

[0055] 11. Adhesive layer;

[0056] 12. Drying layer;

[0057] 13. Catchment pool;

[0058] 14. Circulating water supply system; 141. Connecting pipe; 142. Water pump;

[0059] 15. overflow channel; 151. first baffle; 152. second baffle;

[0060] 16. Sewage pipe;

[0061] 17. Water supply pipe. DETAILED DESCRIPTION

[0062] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with embodiments.

[0063] Example 1

[0064] like Figure 1 As shown, a cyclone dust removal washing tower of this embodiment includes a tower body 1, and a spray dust removal space 2 is provided inside the tower body 1. The spray dust removal space 2 realizes preliminary dust removal by spraying water, and also has an outlet for discharging the gas after dust removal; the tower body 1 is also provided with a dust suction space 5 located outside the spray dust removal space 2, which is connected to the dust channel of the spray dust removal space 2. Specifically, the outlet of the tower body 1 can be connected to the induced draft fan and the exhaust chimney through the connecting air duct and the collecting air duct, and the exhaust gas treated by the tower body 1 is merged in the collecting air duct through the connecting air duct, and then led to the exhaust chimney by the induced draft fan and discharged into the atmosphere.

[0065] An air intake unit 3 connected to the spray dust removal space 2 is arranged on the tower body 1, and the air intake unit 3 guides the gas into the spray dust removal space 2. The spray dust removal space 2 is formed by the inner space of the spray barrel 7 arranged in the tower body 1, and a first spray mechanism 4 for spray dust removal is arranged in the spray dust removal space 2. The first spray mechanism 4 includes a plurality of first nozzles 41 arranged along the rising direction of the airflow, which can spray in all directions so that the spray water mist contacts the dust in the rising airflow to achieve the dust removal effect; specifically, the spray barrel 7 is fixedly connected to the inside of the tower body 1 through a connecting plate or other connecting parts, and the first spray mechanism 4 includes a first water supply pipe, and a plurality of transverse pipes symmetrically or annularly distributed along the center line of the first water supply pipe are fixedly connected to the side of the first water supply pipe, and the end of the transverse pipe is connected to the first nozzle 41.

[0066] In order to make the spray water mist of the first spray mechanism 4 contact more fully with the dust in the airflow, the air intake unit 3 is required to form a spiral upward airflow with the gas entering the spray dust removal space 2, so as to increase the contact time and contact area between the dust in the airflow and the spray water mist. Therefore, an air intake unit 3 is set, including an air intake pipe 31 connected to the lower side of the inside of the spray barrel 7, and the air inlet of the air intake pipe 31 is set along the tangent direction of the cross section of the spray barrel 7. Specifically, the air intake pipe 31 passes through the spray barrel 7 and the tower body 1, and is fixedly connected to the spray barrel 7 and the tower body 1. The air intake of the air intake pipe 31 can be connected to the exhaust gas delivery device through a flange or other connector. In this scheme, the airflow is guided by the air intake pipe 31, blown into the barrel along the tangent position of the spray barrel 7, and guided by the deflection of the barrel wall. The airflow accelerates and rotates in the barrel. Since the pressure section is located at the upper outlet, the airflow is driven by pressure and presents a spiral upward shape. In another possible embodiment, the air intake unit 3 includes a swirl guide plate disposed inside the spray cylinder 7 and an air intake pipe 31 located below the swirl guide plate, and the air intake pipe 31 introduces gas into the spray cylinder 7, and the gas rises through the swirl guide plate to form a spiral rising airflow. Of course, there are other implementations, in which the spiral rising airflow is similar to a tornado, and the cross section along the vertical direction is a trapezoidal shape that is wide at the top and narrow at the bottom.

[0067] Corresponding to the spiral rising airflow, the arrangement diameters of the multiple groups of first nozzles 41 along the rising direction of the airflow are gradually increased, so that the spray water of the first nozzles 41 is always in full contact with the dust in the spiral rising airflow, thereby achieving a better dust removal effect; specifically, the length of the horizontal pipe connecting the first water supply pipe and the first nozzle 41 gradually increases along the rising direction.

[0068] An opening is provided on the upper side of the spray barrel 7, and a baffle plate 9 is fixedly connected above the tower body 1 to separate the space inside the tower body 1 from top to bottom. An air outlet channel 6 is provided on the baffle plate 9 for the airflow after dust removal to flow out; and a second spray mechanism 8 including one or more second nozzles 81 is provided above the baffle plate 9 to further spray and remove dust on the gas flowing out of the air outlet channel 6; the specific second spray mechanism 8 includes a second water supply pipe connected to the first water supply pipe, and the second water supply pipe is connected to the second nozzle 81; in order to prevent the spray water of the second spray mechanism 8 from colliding with the spiral rising airflow and affecting the rise of the airflow, a water retaining cap is provided above the air outlet channel 6. The air outlet channel 6 can be an air outlet directly opposite to the outlet of the spray barrel 7. In order to guide the airflow to rise smoothly through the air outlet channel, the diameter of the air outlet is not less than the maximum arrangement diameter of the first nozzle 41.

[0069] In a general washing tower device, the dust that is not removed by the water mist will eventually continue to rise with the rising airflow, and may eventually gather at the top of the tower body 1, affecting dust removal. Therefore, in addition to the spray dust removal space 2, this embodiment also provides a dust suction space 5 for realizing powder-gas separation. The dust suction space 5 is composed of the outer space of the spray barrel 7. When the spiral airflow in the spray barrel 7 rises to the edge of the opening of the spray barrel 7, it loses its restraint and diffuses into the dust suction space 5 under the action of centrifugal force, thereby realizing dust separation. The separated dust is then treated separately, which is more efficient than the previous method of simply using multi-stage spray dust removal. For the absorption and treatment of dust in the dust suction space 5, a lower drain port 10 is opened on the baffle plate 9 for the wastewater after the second spray mechanism 8 sprays and removes dust. The wastewater enters the dust suction space 5 to absorb the separated dust, realizing multiple utilization of the spray water.

[0070] In order to remove dust more fully, a close contact layer is arranged between the second spray mechanism 8 and the baffle plate 9, so as to make the gas and water fully contact and remove dust more fully. The close contact layer includes a first support net connected to the tower body 1 and the water retaining cap, the first support net can allow water to pass through, and the first support net is connected to a first filling layer, preferably a Raschig ring.

[0071] The gas will eventually flow out of the tower body 1. At this time, due to multiple contacts between the gas and the spray water, the gas contains a large amount of water, resulting in the tail gas not meeting the emission standards. Therefore, a drying layer 12 is set before the gas in the tower body 1 is discharged to dry the treated gas. The drying layer 12 includes a second support net connected to the tower body 1, and the second support net is connected to a second close-fitting layer, preferably a ball ring.

[0072] In order to remove the dust in the wastewater formed in the above-mentioned stages, a water collecting tank 13 is set under the tower body 1 to collect the dust-removed sewage in the spray dust removal space 2 and the dust suction space 5. The water collecting tank 13 can be set separately from the tower body 1 and fixedly connected by a connecting piece, or it can be formed integrally with the tower body 1. A first partition 151 extends upward from the bottom of the water collecting tank 13, and a second partition 152 is inserted from the top of the water collecting tank 13, and an overflow channel 15 is formed between the first partition 151 and the second partition 152. The overflow channel 15 divides the water collecting tank 13 into a sewage area and a clean water area by the natural precipitation of dust, and the two are connected through the overflow channel 15; meanwhile, the dust-removed sewage formed by the spray dust removal space 2 and the dust suction space 5 enters the sewage area of ​​the water collecting tank 13, and after the dust is naturally precipitated, the cleaner water flows into the clean water area through the overflow channel 15. A circulating water supply system 14 connected to the clean water area of ​​the water collection tank 13 is further provided, which extracts water from the clean water area in the water collection tank 13 for spraying water to the spraying mechanism, thereby realizing water recycling. The circulating water supply system 14 includes a connecting pipe 141 connecting the water collection tank 13 and the spraying mechanism, and a water pump 142 is provided in the middle of the pipe to transport the clean water in the water collection tank 13 to the spraying mechanism; specifically, the first water supply pipe is connected to the second water supply pipe, and the connecting pipe 141 in the circulating water supply system 14 is connected to the first water supply pipe and the second water supply pipe. Of course, the above-mentioned first spraying mechanism 4 and the second spraying mechanism 8 can also be supplied with water through a water source separately.

[0073] In order to achieve thorough water circulation, a sewage pipe 16 is opened at the bottom of the water collection tank 13 to discharge the sludge deposited at the bottom of the water collection tank 13. In addition, since there is a certain amount of water consumption during the water circulation process, a water replenishment pipe 17 is set at the clear water area of ​​the water collection tank 13 to replenish the clear water area of ​​the water collection tank 13 in time.

[0074] When treating the tail gas in this embodiment, the tail gas is first introduced into the spray barrel 7 through the water inlet pipe 31, and the tail gas is deflected and guided by the barrel wall to form a spiral rising airflow. The first spray mechanism 4 in the spray barrel 7 sprays water mist through the first nozzle 41 to achieve primary dust removal; the spiral rising airflow continues to rise until it loses its restraint at the edge of the opening on the spray barrel 7, thereby diffusing into the dust suction space 5 to achieve gas-dust separation and complete secondary dust removal. The remaining relatively pure gas continues to rise along the air outlet channel 6; the gas flowing out of the air outlet channel 6 spreads to the surroundings along the water retaining cap, and at this time, the second spray mechanism 8 sprays water through The close contact layer 11 further sprays the gas to remove dust, completing the third-level dust removal, wherein the remaining dust removal wastewater flows into the dust suction space through the lower drain port 10 on the baffle plate 9, thereby removing the dust separated in the second-level dust removal; the remaining gas in the third-level dust removal continues to rise to the close contact layer 11, and the close contact layer 11 achieves a more thorough fourth-level dust removal by increasing the contact area between the spray water mist and the gas, wherein the fourth-level dust removal and the third-level dust removal are carried out simultaneously; finally, the gas passes through the drying layer 12 before being discharged from the tower body 1 to remove the water mist component contained in the gas, so that the gas meets the prescribed emission standards.

[0075] Example 2

[0076] This embodiment provides a gas dust removal method for removing dust from the gas. The method is completed using the cyclone dust removal washing tower in Example 1. The processing process is described in more detail below.

[0077] Step 1: The gas to be treated is introduced into the spray dust removal space 2 formed by the spray tube 7 through the air intake unit 3. The gas is blown into the tube along the tangent position of the spray tube 7. The gas is deflected and guided by the tube wall. The airflow is accelerated in the tube to form a spiral rising airflow.

[0078] Step 2: The first spray mechanism 4 located in the spray dust removal space 2 continuously sprays water mist on the treated gas along the rising direction of the gas. The sprayed water mist comes into contact with the airflow and then absorbs the dust in the gas. At the same time, when the spirally rising airflow rises to the top edge of the spray barrel 7, part of the dust contained in it breaks away from the constraints of the spray dust removal space 2 and enters the dust suction space 5 from the outside of the air outlet channel 6, thereby realizing further separation and dust removal.

[0079] Step 3: The gas is preliminarily dust-removed after being processed in steps 1 and 2.

[0080] Step 4: The gas after step 3 is sprayed for dust removal at least once again, that is, the gas rises along the gas outlet channel 6, and the second spray mechanism 8 arranged above the baffle plate 9 sprays the gas for dust removal again. The sewage obtained during this period enters the dust suction space 5 in step 2, and the separated dust is sprayed for dust removal, so as to realize the reuse of the spray water.

[0081] Step 5: The gas obtained in step 4 passes through a drying layer 12 disposed at the outlet of the tower body 1 before being discharged to remove the water mist component contained in the gas so as to meet the prescribed emission standards.

[0082] Step 6: The dust-removed wastewater obtained from steps 1 to 5 flows into the water collection tank 13 located below the tower body 1, undergoes natural sedimentation in the water collection tank 13, and then the resulting clean water is circulated and transported to the spraying mechanism, thereby achieving cyclic spraying.

[0083] In summary, the gas dust removal method of this embodiment first passes the gas into the spray dust removal space 2 to form a spiral rising airflow, and then sprays and dusts the gas through the spray mechanism; at the same time, the spirally rising gas to be treated separates part of the dust under the action of centrifugal force and enters the dust suction space 5; in addition, the relatively pure gas undergoes at least one more spray dust removal, and the spray wastewater obtained during this period enters the dust suction space 5 to spray and dust the separated dust; finally, the gas is dried to remove the water mist component before being discharged. The dust removal wastewater generated during the gas treatment process finally enters the water collection tank 13, and naturally settles in the water collection tank 13. The obtained clean water is transported back to the spray mechanism to realize circulating water supply, saving water resources and manpower and material costs.

[0084] Example 3

[0085] This embodiment provides the application of the gas dust removal method in embodiment 2 in the treatment of tail gas generated in the production process of solar cells. The tail gas generated in the production process of solar panels contains a large amount of dust. If dust removal is not performed, it will not meet the prescribed emission standards and pollute the environment. Therefore, the tail gas generated in the production process of solar panels is introduced into the spray dust removal space 2 as the gas to be treated. The specific treatment steps are basically the same as those in embodiment 2, and finally the dust in the gas can be fully removed to meet the emission standards.

[0086] In the description of this patent, it should be understood that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on this patent.

[0087] In this patent, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0088] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and the specification only describe the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which should fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A gas dust removal method, characterized in that: include: The tower body (1) has a spray dust removal space (2) inside and an outlet for the gas after dust removal; The spray dust removal space (2) comprises an outlet passage (6) for the gas after the spray dust removal by the first spray mechanism (4) to flow out, and a dust passage located outside the outlet passage (6) for the separated dust to be discharged; It also includes a dust suction space (5), which is located outside the spray dust removal space (2) in the tower body (1) and is connected to the dust passage of the spray dust removal space (2); The steps include: Step 1: introducing the gas to be treated from the lower part of the spray dust removal space (2), and causing the gas to rise in a spiral in the spray dust removal space (2); Step 2: During the rising process of the gas, the spray mechanism continuously sprays and removes dust on the gas to be treated along the rising direction of the gas; when the gas rises to the top of the spray dust removal space (2), the gas is discharged from the gas outlet channel (6); at the same time, part of the dust contained in the gas is freed from the constraints of the spray dust removal space (2) under the action of centrifugal force and discharged from the outside of the gas outlet channel (6) to the dust suction space (5); Step 3: The gas to be treated is initially dust-removed.

2. The gas dust removal method according to claim 1, characterized in that: The gas after step 3 is sprayed again for dust removal at least once.

3. The gas dust removal method according to claim 2, characterized in that: The dust separated in step 2 is sprayed and dusted using the wastewater generated by the subsequent spray dust removal.

4. The gas dust removal method according to claim 1, 2 or 3, characterized in that: The treated gas is discharged after being dried.

5. The gas dust removal method according to claim 1, 2 or 3, characterized in that: The wastewater generated by spray dust removal is used for circulating spraying after natural sedimentation and purification.

6. Application of the gas dust removal method according to any one of claims 1 to 5 in the treatment of tail gas generated in the production process of solar cells.

7. A cyclone dust removal washing tower, comprising: The tower body (1) has a spray dust removal space (2) inside and an outlet for the gas after dust removal; An air intake unit (3) connected to the spray dust removal space (2); A first spray mechanism (4), located in the spray dust removal space (2), is used for spray dust removal; The invention is characterized in that the air inlet unit (3) is used to form a spiral upward airflow into the gas introduced into the spray dust removal space (2); the spray dust removal space (2) has an air outlet channel (6) for the gas after spray dust removal by the first spray mechanism (4) to flow out, and a dust channel located outside the air outlet channel (6) for the separated dust to be discharged; It also includes a dust suction space (5), which is located outside the spray dust removal space (2) in the tower body (1) and is connected to the dust passage of the spray dust removal space (2); It also includes a water collection tank (13) which is detachably connected to or integrally formed with the tower body and is used to collect dust removal wastewater in the spray dust removal space (2) and the dust suction space (5).

8. A cyclone dust removal washing tower according to claim 7, characterized in that: The tower body (1) is provided with a cylindrical spray barrel (7) with an opening on the upper side, and the inner and outer spaces of the spray barrel (7) respectively form a spray dust removal space (2) and a dust suction space (5), and the upper opening forms an air outlet channel (6) in the middle and dust channels on both sides; the first spray mechanism (4) is arranged below the air outlet channel (6) in the spray barrel (7).

9. A cyclone dust removal washing tower according to claim 8, characterized in that: The air intake unit (3) comprises an air intake pipe (31) connected to the lower side of the interior of the spray barrel (7), and an air intake port of the air intake pipe (31) is arranged along the tangent direction of the cross section of the spray barrel (7).

10. A cyclone dust removal washing tower according to claim 7, characterized in that: The first spray mechanism (4) comprises a plurality of groups of first spray heads (41) arranged along the ascending direction of the airflow, which can spray and remove dust in all directions; the diameters of the plurality of groups of first spray heads (41) arranged along the ascending direction of the airflow gradually increase.

11. A cyclone dust removal washing tower according to claim 8, characterized in that: In the tower body (1), a baffle plate (9) is arranged above the spray cylinder (7) to separate the space in the tower into upper and lower parts; the air outlet channel (6) is opened on the baffle plate (9); It also includes a second spray mechanism (8) located above the baffle plate (9) inside the tower body (1) and used for spraying and removing dust from the gas discharged from the gas outlet channel (6); a lower drainage port (10) is provided on the baffle plate (9) for the second spray mechanism (8) to spray water out, and the lower drainage port (10) is connected to the dust suction space (5).

12. A cyclone dust removal washing tower according to claim 11, characterized in that: A water retaining cap is arranged above the air outlet channel (6) to prevent water from flowing in.

13. A cyclone dust removal washing tower according to claim 11, characterized in that: A close contact layer (11) is arranged between the second spray mechanism (8) and the baffle plate (9) for enabling the gas and water to fully contact each other.

14. A cyclone dust removal washing tower according to claim 13, characterized in that: The close-contact layer (11) is a Raschig ring arranged above the tower body (1).

15. A cyclone dust removal washing tower according to claim 11, characterized in that: A drying layer (12) is arranged before the gas discharge port in the tower body (1) to dry the treated gas.

16. A cyclone dust removal washing tower according to claim 15, characterized in that: The drying layer (12) is a ball ring arranged above the tower body (1).

17. A cyclone dust removal washing tower according to claim 7, characterized in that: The water collection tank (13) is divided into a sewage area and a clean water area, which are connected via an overflow channel (15); the dust removal sewage in the spray dust removal space (2) and the dust suction space (5) enters the sewage area of ​​the water collection tank (13); It also includes a circulating water supply system (14) for extracting water from the clear water area of ​​the water collection tank (13) to supply water for spraying by the spraying mechanism.

18. A cyclone dust removal washing tower according to claim 17, characterized in that: A first baffle (151) extends upward from the bottom of the water collecting pool (13), and a second baffle (152) is inserted from above the water collecting pool (13) into the pool close to the bottom of the pool, and an overflow channel (15) is formed between the first baffle (151) and the second baffle (152).

19. A cyclone dust removal scrubber according to claim 17, characterized in that: The sewage area in the water collection tank (13) is provided with a sewage discharge pipe (16), and the clean water area is provided with a water replenishment pipe (17).

20. The cyclone dust removal washing tower according to claim 17, characterized in that: The circulating water supply system (14) comprises a connecting pipe (141) connecting the clean water area of ​​the water collection tank (13) with the spray mechanism, and a water pump (142) is arranged on the connecting pipe (141).

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