CN113230870A - Desulfurizing tower dual cycle wet process filtration system for chemical production - Google Patents
Desulfurizing tower dual cycle wet process filtration system for chemical production Download PDFInfo
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- CN113230870A CN113230870A CN202011477536.4A CN202011477536A CN113230870A CN 113230870 A CN113230870 A CN 113230870A CN 202011477536 A CN202011477536 A CN 202011477536A CN 113230870 A CN113230870 A CN 113230870A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/602—Oxides
Abstract
The invention provides a desulfurization tower double-circulation wet-process filtration system for chemical production, which comprises an outer circulation tower and an inner circulation tower, wherein the inner circulation tower is arranged at the inner side of the outer circulation tower, the top of the inner circulation tower is communicated with the top of the outer circulation tower, the lower side of the side wall of the outer circulation tower is provided with an air inlet pipeline, the tail end of the air inlet pipeline extends to the position right below the structure of the inner circulation tower, an atomization supporting plate and a rain curtain supporting plate are sequentially welded between the outer circulation tower and the inner circulation tower from top to bottom, the inner side of the inner circulation tower is vertically provided with a flue gas outlet, a spiral supporting plate is welded between the flue gas outlet and the inner wall of the inner circulation tower, the upper sides of the atomization supporting plate and the spiral supporting plate are respectively provided with a ring-shaped primary spray pipe and a ring-shaped secondary spray pipe, the bottoms of the outer circulation tower and the inner circulation tower are respectively connected with a primary slurry outlet and a secondary slurry outlet, the invention arranges the inner and outer circulation structure to match different supporting plates at different positions, the effective contact of the lime water slurry and the flue gas is improved, the flue gas desulfurization effect is greatly improved, and the method has a good development prospect.
Description
Technical Field
The invention relates to the field of industrial waste gas treatment, in particular to a desulfurization tower double-circulation wet-process filtering system for chemical production.
Background
Along with the improvement of social environmental protection consciousness and the sound national laws and regulations, the emission control of facility pollutants is increasingly strict, the SO emission value of industrial waste gas is required to be lower than 50mg/NM, the wet desulphurization process has the advantages of high desulphurization efficiency (more than or equal to 95 percent), good stability, low operation cost and the like, the wet desulphurization process is widely applied to the ultra-low emission desulphurization treatment of flue gas in the domestic chemical industry, the limestone-gypsum wet desulphurization process is the most common wet desulphurization process in the wet desulphurization process, limestone slurry is used as an absorbent, the flue gas is washed in an absorption tower through the limestone slurry, and a reaction is carried out to remove SO in the flue gas, and calcium sulfite produced by the reaction generates calcium sulfate (gypsum) containing two crystal waters through forced oxidation.
However, the traditional desulfurizing tower often has the problems that the operating air speed of the empty tower of the desulfurizing tower is too high (more than or equal to 5m/s), the retention time of the sintering flue gas in the tower is too short, the sintering flue gas cannot be fully contacted with limestone-gypsum spraying slurry, the desulfurizing efficiency is influenced, and the like, and the increase of the site, equipment and operation and maintenance costs is brought by adopting a method of connecting double towers in series.
Disclosure of Invention
The invention aims to provide a double-circulation wet-process filtering system of a desulfurizing tower for chemical production, which solves the problem that the residence time of sintering flue gas in the traditional desulfurizing tower is too short, the sintering flue gas cannot be fully contacted with limestone-gypsum spraying slurry, and the desulfurizing efficiency is influenced.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a desulfurizing tower dual cycle wet process filtration system for chemical production, including the desulfurizing tower, the desulfurizing tower divide into outer loop tower and inner loop tower, the inner loop tower sets up the inboard at outer loop tower, top and outer loop tower top intercommunication, the lateral wall downside of outer loop tower is provided with the admission line that the tail end extends to the position under the inner loop tower structure, top-down has welded atomizing layer board and rain curtain layer board in proper order between outer loop tower and the inner loop tower, the inboard vertical exhanst gas outlet that is provided with of inner loop tower, the welding has the spiral layer board between exhanst gas outlet and the inner loop tower inner wall, the upside of atomizing layer board and spiral layer board is provided with annular one-level shower and second grade shower respectively, be provided with a plurality of shower heads on one-level shower and the second grade shower, the bottom of outer loop tower and inner loop tower respectively with one-level slurry outlet and second grade slurry outlet connection.
As a further scheme of the invention: the bottom of the internal circulation tower is conical, the lowest end of the internal circulation tower is welded with a flow guide cover, and the flow guide cover is in an inverted funnel shape.
As a further scheme of the invention: the atomizing layer board comprises guide plate and atomizing board, and guide plate and atomizing board weld respectively on the inner wall of outer circulation tower and the outer wall structure of inner circulation tower, and the opening is left to the opposite side.
As a further scheme of the invention: the atomization plate comprises a first step surface, a second step surface and a third step surface, the second step surface is located in the middle, the two sides of the atomization plate are connected with the first step surface and the third step surface through inclined surface structures, the horizontal position of the second step surface is lowest, the third step surface is next to the first step surface, the first step surface is highest, and a groove structure formed among the second step surface, the first step surface and the third step surface is internally covered with a sleeve plate.
As a further scheme of the invention: the second step surface has outstanding toper atomizing nozzle through metal stamping process, and the height that highly is higher than the third step height of atomizing nozzle structure, the clearance is arc concave surface structure between the atomizing nozzle, and the bottom of concave surface is provided with the outage.
As a further scheme of the invention: the lagging is metal stamping plate, and surface stamping processing has the diameter to be greater than the toper structure of atomizing nozzle diameter, and toper structure suit is in atomizing nozzle's the outside, and leaves 3 mm's clearance between the atomizing nozzle, and the position that the lagging surface corresponds with second step face outage is provided with the through-liquid hole that the diameter is greater than the outage.
As a further scheme of the invention: the rain curtain supporting plate is divided into an upper supporting plate and a lower supporting plate and consists of at least one group of upper supporting plate and lower supporting plate, and the upper supporting plate and the lower supporting plate are welded between the outer circulating tower and the inner circulating tower in a funnel shape which is upright and inverted respectively.
As a further scheme of the invention: the surface of higher level's layer board and subordinate's layer board all is provided with the circular through-hole of a plurality of annular distributions, and the through-hole is divided into a plurality of groups according to the relative height on higher level's layer board or subordinate's layer board surface, and the diameter and the relative height of different groups through-hole are directly proportional, and the quantity and the relative height of different groups through-hole are the inverse ratio.
As a further scheme of the invention: the through holes on the surfaces of the upper supporting plate and the lower supporting plate are respectively arranged in a staggered manner with the through hole of the other supporting plate in the vertical direction.
As a further scheme of the invention: the spiral layer board is the heliciform, and the surface is provided with the through-hole that a plurality of arrays were arranged, staggers in vertical direction through the setting of interval distance and angle and upper and lower layer through-hole between the through-hole.
Advantageous effects
1. The invention is provided with an internal circulation tower and an external circulation tower, the pH value of the external circulation tower is generally controlled between 4.5 and 5.0, the low pH value is beneficial to dissolving limestone and crystallizing gypsum, the gypsum with high quality can be obtained, the pH value of the internal circulation tower is controlled between 5.6 and 6.4, the higher pH value can obtain higher desulfurization efficiency, the liquid-gas ratio is reduced, the energy consumption of a circulating pump is reduced, and the external circulation tower and the internal circulation tower are nested, so that the space and the manufacturing cost are favorably saved.
2. The atomization supporting plate and the rain curtain supporting plate are arranged in the external circulation tower, rain curtain filtering and atomization filtering are performed on the flue gas in a segmented mode according to the counter-current flow direction of the flue gas in the external circulation tower, effective contact between the flue gas and limestone slurry is improved through coarse filtering of the rain curtain and fine filtering of water mist, and the desulfurization effect is improved.
3. The rain curtain supporting plate is provided with the broken line channels through the inclined planes in different directions, and the large-caliber through holes in the surface of the rain curtain supporting plate are arranged on one side with the relative height, so that most of smoke can only move along the broken line channels, the inclined plane structure of the rain curtain supporting plate can guide slurry to one side with the relative height and form a plurality of dense water curtains for blocking the broken line channels through the number advantage of small diameter, the contact effect of limestone slurry and the smoke is improved, and meanwhile, the through holes in the upper layer structure and the lower layer structure of the rain curtain supporting plate are staggered, so that the water curtains dripped from the upper layer can collide with the lower layer structure, more tiny water drops are generated, the contact area with the smoke is improved, and the desulfurization effect is improved.
4. The atomizing support plate is provided with a plurality of atomizing nozzles through a stamping process, the outer sides of the atomizing nozzles are sleeved with sleeve plates, micro gaps are reserved between the sleeve plates and the atomizing nozzles, the atomizing nozzle structure can play a bundling role on smoke, the flow rate of the smoke is improved, pressure changes caused by the improvement of the flow rate of the smoke are increased, limestone slurry accumulated in a groove structure of a second-stage surface is sucked up through the micro gaps, the slurry collides with a guide plate under the wrapping of the smoke, small-particle water mist is formed in a refining mode, the contact effect of the slurry and the smoke is improved, the smoke is desulfurized more finely, the atomizing nozzles are provided with arc-shaped concave surfaces at the positions, liquid discharge holes are formed in the bottoms of the atomizing nozzles, the flowability of the slurry at the second-stage surface can be maintained, the phenomenon that the limestone particles are deposited and accumulated on the second-stage surface to block the operation of the atomizing nozzles due to the reduction of the flowability of the slurry is prevented, and the stability of the effect of the atomizing nozzles is ensured.
Drawings
Fig. 1 is a sectional view of the overall structure of the present invention.
FIG. 2 is an enlarged view of the structure at A of FIG. 1 according to the present invention.
FIG. 3 is an enlarged view of the structure at B of FIG. 1 according to the present invention.
Fig. 4 is a sectional view of an atomizing plate structure of the present invention.
Fig. 5 is a schematic structural diagram of the upper layer supporting plate of the invention.
FIG. 6 is a schematic view of a lower layer pallet structure according to the present invention.
Fig. 7 is a schematic structural diagram of the spiral supporting plate of the invention.
In FIGS. 1-7: 1-a desulfurizing tower, 2-an external circulation tower, 3-an internal circulation tower, 301-a flow guide cover, 4-an air inlet pipeline, 5-a primary spray pipe, 501-a spray header, 6-an atomizing supporting plate, 7-a flow guide plate, 8-an atomizing plate, 801-a first step surface, 802-a second step surface, 803-a third step surface, 804-an atomizing nozzle, 805-a liquid discharge hole, 806-a sleeve plate, 807-a liquid through hole, 9-a rain curtain supporting plate, 901-an upper supporting plate, 902-a lower supporting plate, 10-a primary slurry outlet, 11-a secondary spray pipe, 12-a spiral supporting plate, 13-a secondary slurry outlet and 14-a flue gas outlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of the word "comprising" or "comprises", and the like, in this disclosure is intended to mean that the elements or items listed before that word, include the elements or items listed after that word, and their equivalents, without excluding other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Referring to fig. 1-7, in the embodiment of the present invention, a desulfurization tower dual-cycle wet filtration system for chemical production includes a desulfurization tower 1, an external circulation tower 2, an internal circulation tower 3, a diversion cover 301, an air inlet pipe 4, a primary spray pipe 5, a spray header 501, an atomization supporting plate 6, a diversion plate 7, an atomization plate 8, a first step 801, a second step 802, a third step 803, an atomization nozzle 804, a liquid discharge hole 805, a sheathing plate 806, a liquid through hole 807, a rain curtain supporting plate 9, an upper supporting plate 901, a lower supporting plate 902, a primary slurry outlet 10, a secondary spray pipe 11, a spiral supporting plate 12, a secondary slurry outlet 13, a flue gas outlet 14, and a desulfurization tower 1 divided into an external circulation tower 2 and an internal circulation tower 3, wherein the internal circulation tower 3 is disposed inside the external circulation tower 2, the top of the external circulation tower 2 is communicated with the top of the external circulation tower 2, the lower side wall of the external circulation tower 2 is provided with the air inlet pipe 4 having a tail end extending to a position right below the structure of the internal circulation tower 3, the top-down has welded atomizing layer board 6 and rain curtain layer board 9 in proper order between outer loop tower 2 and the inner loop tower 3, the inboard vertical exhanst gas outlet 14 that is provided with of inner loop tower 3, the welding has spiral layer board 12 between exhanst gas outlet 14 and the 3 inner walls of inner loop tower, the upside of atomizing layer board 8 and spiral layer board 12 is provided with annular one-level shower 5 and second grade shower 11 respectively, be provided with a plurality of shower heads 501 on one-level shower 5 and the second grade shower 11, the bottom of outer loop tower 2 and inner loop tower 3 is connected with one-level thick liquid export 10 and second grade thick liquid export 13 respectively.
Wherein: the bottom of inner loop tower 3 is the toper, and the welding of bottommost end has water conservancy diversion lid 301, and water conservancy diversion lid 301 is the infundibulate of invering, carries out the water conservancy diversion through water conservancy diversion lid 301 to the thick liquid in the outer loop tower 2, prevents that the thick liquid from falling into in the admission line 4.
Wherein: atomizing layer board 6 comprises guide plate 7 and atomizing board 8, and guide plate 7 welds respectively with atomizing board 8 in the outer wall structure of inner wall and inner loop tower 3 of outer loop tower 2, and the opening is left to the opposite side, separates through guide plate and atomizing board and forms airflow channel, leads the flue gas, improves the effective contact of flue gas and thick liquid.
Wherein: the atomization plate 8 includes a first step surface 801, a second step surface 802 and a third step surface 803, the second step surface 802 is located at the middle position, and the two sides of the second step surface 802 are connected with the first step surface 801 and the third step surface 802 through an inclined surface structure, wherein the horizontal position of the second step surface 802 is the lowest, the third step surface 803 is the next to the first step surface 801, the first step surface 801 is the highest, and a groove structure formed between the second step surface 802 and the first step surface 801 and the third step surface 803 is covered with a sleeve plate 806.
Wherein: the surface of the second step surface 802 is processed with a protruding conical atomizing nozzle 804 through metal stamping, the height of the atomizing nozzle 804 structure is higher than that of the third step surface 803, a gap between the atomizing nozzles 804 is of an arc concave surface structure, a liquid discharge hole 805 is formed in the bottom of the concave surface, the height of the second step surface 802 plays a role in storing slurry, and meanwhile, due to the arrangement of the concave surface structure and the liquid discharge hole 805, sediment in the slurry can be timely discharged to prevent limestone particles which are not completely dissolved in the slurry from being accumulated at the second step surface 802 to affect the work of the atomizing nozzle 804.
Wherein: the sleeve plate 806 is a metal stamping plate, a conical structure with the diameter larger than that of the atomizing nozzle 804 is stamped on the surface of the metal stamping plate, the conical structure is sleeved on the outer side of the atomizing nozzle 804, a gap of 3mm is reserved between the conical structure and the atomizing nozzle 804, and liquid through holes 807 with the diameter larger than that of the liquid discharging holes 805 are arranged on the surface of the sleeve plate 806 corresponding to the liquid discharging holes 805 of the second step surface 802.
Wherein: rain curtain layer board 9 divide into higher level layer board 901 and subordinate layer board 902, constitute by at least a set of higher level layer board 901 and subordinate layer board 902, higher level layer board 901 is just with subordinate layer board 902 respectively and is just set up with the funnel shape welding of inversion between outer loop tower 2 and inner loop tower 3, through the difference of higher level layer board 901 and subordinate layer board 902 installation direction, make to form the broken line passageway between the rain curtain layer board 9, improve the effective contact of the retention time of flue gas and rain curtain, the effect of flue gas desulfurization has been improved.
Wherein: the surface of higher level's layer board 901 and subordinate's layer board 902 all is provided with the circular through-hole of a plurality of annular distributions, the through-hole is divided into a plurality of groups according to the relative height on higher level's layer board 901 or subordinate's layer board 902 surface, the diameter and the relative height of different group's through-holes are directly proportional, the quantity and the relative height of different group's through-holes are inversely proportional, set up the broken line passageway of cooperation rain curtain layer board 9 through-hole quantity and diameter, make major diameter through-hole department be the place that the flue gas percent of pass is high, the minor diameter through-hole that 9 structure quantities of rain curtain layer board through the upper strata forms intensive rain curtain, and the flue gas passes intensive rain curtain many times under the direction of rain curtain layer board 9, the retention time and the flue gas of flue gas have been improved, effective contact between the rain curtain, the effect of flue gas desulfurization has been improved.
Wherein: the through-hole on higher level's layer board 901 and the layer board 902 surface of subordinate staggers the setting with the through-hole of another layer board respectively in vertical direction, through the through-hole that staggers, after the through-hole of superstructure has the water droplet to drip, can collide with the substructure, produces more tiny drops of water, also prevents that the water droplet that the minor diameter through-hole drips from directly passing from the major diameter through-hole, has improved thick liquid and flue gas area of contact, has improved flue gas desulfurization's effect.
Wherein: spiral layer board 12 is the heliciform, and the surface is provided with the through-hole that a plurality of arrays were arranged, staggers in vertical direction through the setting of interval distance and angle and lower floor's through-hole between the through-hole, and through the through-hole that staggers, after the through-hole of superstructure has the water droplet to drip, can collide with substructure, produce more tiny drops of water, improve with flue gas area of contact, improved flue gas desulfurization's effect.
When the invention is used, the flue gas to be desulfurized is introduced from the bottom of the external circulation tower 2 through the air inlet pipeline 4, the limestone slurry is sprayed out through the spray header 501 of the primary spray pipe 5 and flows to the atomizing plate 8 through the guide plate 7, a small amount of limestone slurry is accumulated at the second-level surface 802 of the atomizing plate 8, after the limestone slurry fills the second-level surface 802, the rest limestone slurry flows to the rain curtain supporting plate 9 through the opening at one side of the atomizing plate 8 under the action of gravity, is guided to the small-diameter through hole at the relatively lower position of the surface of the rain curtain supporting plate 9 under the action of the inclined surface of the rain curtain supporting plate 9 and drops through the small-diameter through hole, an annular dense water curtain is formed at the large-diameter through hole of the rain curtain supporting plate 9 at the lower side, when the flue gas passes through the broken-line channel formed by the rain curtain supporting plate 9, the dense water curtain can pass through for multiple times to fully contact and react with the slurry, and roughly filter the flue gas, then, the flue gas is delivered to the position of the atomizing plate 8, part of the flue gas flows out through the atomizing nozzles 804 on the atomizing plate 8, the limestone slurry accumulated in the groove structure of the second-stage surface 802 is wrapped and carried by the pressure change caused by the flow of the flue gas to collide with the guide plate 7, the slurry is refined to form water mist, the contact fineness between the flue gas at the atomizing support plate 8 and the slurry is improved, the clean slurry at the atomizing support plate 8 is used for fine desulfurization, the slurry enters the rain curtain support plate 9 after being slightly polluted to be used for coarse desulfurization of the flue gas again, the utilization rate of the slurry and the flue gas desulfurization effect are improved, and the slurry dropped from the rain curtain support plate 9 is discharged through the primary slurry outlet 10 and purified to be recycled;
the flue gas after desulfurization in the outer circulation tower 5 enters the inner circulation tower 6 through the top of the inner circulation tower 6 and is sprayed by the secondary spraying pipe 11 for desulfurization again, the contact and reaction time of the flue gas and the slurry is prolonged by the spiral supporting plate 12 of the inner circulation tower 6, finally the flue gas is discharged from the flue gas outlet 14, and the slurry in the inner circulation tower 3 is discharged through the secondary slurry outlet 13 and is purified for recycling again.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several variations and modifications without departing from the concept of the present invention, and these should be considered as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (10)
1. A desulfurization tower double-circulation wet-process filtration system for chemical production is characterized by comprising a desulfurization tower (1), wherein the desulfurization tower (1) is divided into an outer circulation tower (2) and an inner circulation tower (3), the inner circulation tower (3) is arranged on the inner side of the outer circulation tower (2), the top of the inner circulation tower is communicated with the top of the outer circulation tower (2), the lower side of the side wall of the outer circulation tower (2) is provided with an air inlet pipeline (4) the tail end of which extends to the position under the structure of the inner circulation tower (3), an atomization supporting plate (6) and a rain curtain supporting plate (9) are sequentially welded between the outer circulation tower (2) and the inner circulation tower (3) from top to bottom, the inner side of the inner circulation tower (3) is vertically provided with a flue gas outlet (14), a spiral supporting plate (12) is welded between the flue gas outlet (14) and the inner wall of the inner circulation tower (3), the atomization supporting plate (8) and the upper side of the spiral supporting plate (12) are respectively provided with an annular primary spray pipe (5) and a secondary spray pipe (11), a plurality of spray heads (501) are arranged on the first-stage spray pipe (5) and the second-stage spray pipe (11), and the bottoms of the external circulation tower (2) and the internal circulation tower (3) are respectively connected with a first-stage slurry outlet (10) and a second-stage slurry outlet (13).
2. The desulfurization tower double-circulation wet-process filtration system for chemical production according to claim 1, characterized in that: the bottom of the internal circulation tower (3) is conical, the lowest end of the internal circulation tower is welded with a flow guide cover (301), and the flow guide cover (301) is in an inverted funnel shape.
3. The desulfurization tower double-circulation wet-process filtration system for chemical production according to claim 1, characterized in that: the atomization supporting plate (6) is composed of a guide plate (7) and an atomization plate (8), the guide plate (7) and the atomization plate (8) are respectively welded on the inner wall of the outer circulation tower (2) and the outer wall of the inner circulation tower (3) structurally, and a through opening is reserved on the other side.
4. The desulfurization tower double-circulation wet-process filtration system for chemical production according to claim 1, characterized in that: the atomization plate (8) comprises a first step surface (801), a second step surface (802) and a third step surface (803), the second step surface (802) is located in the middle, the two sides of the second step surface are connected with the first step surface (801) and the third step surface (802) through inclined surface structures, the horizontal position of the second step surface (802) is the lowest, the horizontal position of the third step surface (803) is the highest, and a groove structure formed among the second step surface (802), the first step surface (801) and the third step surface (803) is internally covered with a sleeve plate (806).
5. The desulfurization tower double-circulation wet-process filtration system for chemical production according to claim 4, characterized in that: the surface of the second step surface (802) is processed with a protruding conical atomizing nozzle (804) through metal stamping, the height of the structure of the atomizing nozzle (804) is higher than that of the third step surface (803), the gap between the atomizing nozzles (804) is of an arc concave surface structure, and the bottom of the concave surface is provided with a liquid discharge hole (805).
6. The desulfurization tower double-circulation wet-process filtration system for chemical production according to claim 4, characterized in that: the sleeve plate (806) is a metal stamping plate, a conical structure with the diameter larger than that of the atomizing nozzle (804) is stamped on the surface of the metal stamping plate, the conical structure is sleeved on the outer side of the atomizing nozzle (804), a gap of 3mm is reserved between the conical structure and the atomizing nozzle (804), and liquid through holes (807) with the diameter larger than that of the liquid discharging holes (805) are formed in the surface of the sleeve plate (806) and the positions corresponding to the liquid discharging holes (805) of the second step surface (802).
7. The desulfurization tower double-circulation wet-process filtration system for chemical production according to claim 1, characterized in that: the rain curtain supporting plate (9) is divided into an upper supporting plate (901) and a lower supporting plate (902) and is composed of at least one group of upper supporting plate (901) and lower supporting plate (902), and the upper supporting plate (901) and the lower supporting plate (902) are welded between the outer circulation tower (2) and the inner circulation tower (3) in a funnel shape which is upright and inverted respectively.
8. The desulfurization tower double-circulation wet-process filtration system for chemical production according to claim 7, characterized in that: the surfaces of the upper layer supporting plate (901) and the lower layer supporting plate (902) are provided with a plurality of circular through holes distributed in an annular mode, the through holes are divided into a plurality of groups according to the relative height of the surfaces of the upper layer supporting plate (901) or the lower layer supporting plate (902), the diameters of the through holes in different groups are in direct proportion to the relative height, and the number of the through holes in different groups is in inverse proportion to the relative height.
9. The desulfurization tower double-circulation wet-process filtration system for chemical production according to claim 7, characterized in that: the through holes on the surfaces of the upper layer supporting plate (901) and the lower layer supporting plate (902) are respectively staggered with the through hole of the other supporting plate in the vertical direction.
10. The desulfurization tower double-circulation wet-process filtration system for chemical production according to claim 1, characterized in that: spiral layer board (12) are the heliciform, and the surface is provided with the through-hole that a plurality of arrays were arranged, staggers in vertical direction through the setting of interval distance and angle and upper and lower layer through-hole between the through-hole.
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