CN110354653B - Flue gas desulfurization and denitrification purification system and purification method - Google Patents
Flue gas desulfurization and denitrification purification system and purification method Download PDFInfo
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- CN110354653B CN110354653B CN201910627123.0A CN201910627123A CN110354653B CN 110354653 B CN110354653 B CN 110354653B CN 201910627123 A CN201910627123 A CN 201910627123A CN 110354653 B CN110354653 B CN 110354653B
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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
- 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
- B01D53/504—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 device
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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
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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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
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- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses a flue gas desulfurization and denitration purification system, which comprises a flue gas inlet pipe, a circulating desulfurizer, a flue gas denitrator, a transition pipe and a flue gas outlet pipe; the smoke inlet pipe is communicated with the smoke inlet end of the circulating desulfurizer, the smoke outlet end of the circulating desulfurizer is communicated with the smoke inlet end of the smoke denitrator through the transition pipe, and the smoke outlet end of the smoke denitrator is communicated with the smoke outlet pipe; the flue gas is subjected to secondary leaching by flue gas leaching water in the process of passing through the arc-shaped flue gas channel; the flue gas can be treated by two leaching processes to fully improve the desulfurization effect.
Description
Technical Field
The invention belongs to the field of flue gas desulfurization.
Background
The existing flue gas desulfurization equipment is often in a leaching tower structure, the existing leaching tower is transitional, flue gas can be leached only once, if one leaching process needs to be added, an additional leaching tower needs to be added, the cost is doubled, and due to the fact that leaching solution contains insoluble CaCO3 turbid liquid, liquid outlet nozzles on a leaching spray head are prone to being blocked along with the accumulation of time and the like.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a flue gas desulfurization and denitrification purification system and a purification method.
The technical scheme is as follows: in order to achieve the purpose, the flue gas desulfurization and denitration purification system comprises a flue gas inlet pipe, a circulating desulfurizer, a flue gas denitrator, a transition pipe and a flue gas outlet pipe; the smoke inlet pipe is communicated with the smoke inlet end of the circulating desulfurizer, the smoke outlet end of the circulating desulfurizer is communicated with the smoke inlet end of the smoke denitrifier through the transition pipe, and the smoke outlet end of the smoke denitrifier is communicated with the smoke outlet pipe.
Further, the circulating desulfurizer comprises a long rectangular water tank which is obliquely arranged, and the long rectangular water tank is supported above the ground platform through a plurality of support columns; an oblique circulating cavity is arranged in the long rectangular water tank, the short end of the circulating cavity is a low-level cavity, and the high end of the circulating cavity is a high-level cavity; the circulating pipe is provided with a circulating pump, and the circulating pump can enable the circulating pipe to suck liquid in the low-position cavity into the high-position cavity; the smoke inlet end of the transition pipe is communicated with the upper end of the high-level cavity;
the upper side of the middle part of the long rectangular water tank is a semicircular integrated arched shell, an impeller cavity is arranged in the arched shell, and two sides of the lower part of the impeller cavity are respectively communicated with the lower end of the high-level cavity and the upper end of the low-level cavity; a desulfurization impeller is rotationally arranged in an impeller cavity in the arched shell; a water circulation passage is formed between the lower end of the desulfurization impeller and the lower inclined bottom wall of the long rectangular water tank, and water in the high-level cavity can flow to the low-level cavity through the water flow passage; the water flow flowing through the water flow passage can drive the desulfurization impeller to rotate clockwise; an arc-shaped flue gas channel is formed between the upper end of the desulfurization impeller and the inner wall of the arch-shaped shell, and flue gas in the low-level cavity can flow into the high-level cavity through the arc-shaped flue gas channel.
Further, the desulfurization impeller comprises an impeller hub, the impeller hub is of a cylindrical structure, and a left bearing barrel and a right bearing barrel are integrally arranged at two ends of the impeller hub respectively and coaxially; the left bearing cylinder and the right bearing cylinder; a left smoke guide channel is arranged in the left bearing cylinder; the outer walls of the left bearing cylinder and the right bearing cylinder are respectively in rotary sealing connection with the inner wall of the arched shell through a left bearing and a right bearing; the left end of the arched shell is integrally connected with a cigarette storage shell, and the inner cavity of the cigarette storage shell is a cigarette storage cavity; the smoke storage cavity is communicated with the left smoke guide channel; the smoke outlet end of the smoke inlet pipe is rotatably sleeved with the inner wall of the right bearing cylinder through a bearing, and a smoke inlet channel is arranged in the smoke inlet pipe; the smoke returning pipe is also included, and one end of the smoke returning pipe is communicated with the upper side of the low-level cavity; the other end of the smoke returning pipe is communicated with the smoke storage cavity.
Furthermore, a plurality of hollowed holes are uniformly distributed and hollowed in a circumferential array on the wall of the impeller hub; the outer edges of two ends of the impeller hub are respectively and symmetrically provided with a water retaining ring plate; a plurality of hydraulic driving blades are distributed on the periphery of the impeller hub in a circumferential array, and two ends of each hydraulic driving blade extend to the two water retaining ring plates which are integrally connected; and each said hydraulically driven blade is inclined 30 to 40 degrees counter-clockwise with respect to the radial direction of the impeller hub; a flue gas desulfurization transfer cavity is formed between two adjacent hydraulic drive blades on each impeller hub; a descending groove is formed between each hydraulic driving blade at the right side position of the cross section of the impeller hub and the outer wall of the impeller hub; a plurality of liquid leakage holes are uniformly distributed on each hydraulic driving blade, and liquid in the descending groove can leak downwards through the liquid leakage holes;
the tail end of each blade of the hydraulic driving blade is uniformly connected with a water scooping blade, and the extending direction of the tail end of each water scooping blade is consistent with the tangential line of the impeller hub in the clockwise direction; a water scooping lifting groove is formed between each water scooping blade at the left side position of the impeller hub and the corresponding hydraulic driving blade; a left hole plugging piece and a right hole plugging piece are arranged in the cylinder structure of the impeller hub; the left hole plugging piece and the right hole plugging piece are of transverse cylinder structures, the cross section profiles of the cylinders of the left hole plugging piece and the right hole plugging piece are in bowstring shapes, the left cambered surface side wall of the left hole plugging piece and the right cambered surface side wall of the right hole plugging piece are in sliding fit with the cylindrical inner wall of the impeller hub, and the left cambered surface side wall and the right cambered surface side wall can plug the hollow hole at the position; the left plane side wall on the left hole plugging piece and the right plane side wall on the right hole plugging piece are both parallel to the plumb direction, and the left plane side wall and the right plane side wall are arranged at intervals; a smoke leaching channel is formed between the left plane side wall and the right plane side wall, and two ends of the smoke leaching channel are respectively communicated with the left smoke guide channel and the smoke inlet channel; one end of the left hole blocking piece and one end of the right hole blocking piece are fixedly connected with the inner wall of the cigarette storage shell through a second supporting column.
Further, a flue gas desulfurization method of the flue gas desulfurization, denitration and purification system comprises the following steps:
injecting a proper amount of flue gas leaching water into a circulating cavity in a long rectangular water tank, wherein the flue gas leaching water contains lime turbid liquid for reacting with sulfur dioxide; under the condition that the circulating pump is not started, the flue gas leaching water in the long rectangular water tank can be collected at the lower end of the low-level cavity under the action of gravity;
step two, starting a circulating pump, so that the circulating pump drives the circulating pipe to continuously pump the flue gas leaching water in the low-level cavity into the high-level cavity, the flue gas leaching water entering the high-level cavity flows downwards along the slope of the lower inclined bottom wall, and the flue gas leaching water in the high-level cavity continuously flows back to the low-level cavity again through a water flow passage, so that water flow circulation is formed in the long rectangular water tank; water flow always flows downwards in the water circulation passageway, and water flowing in the water flow passageway continuously submerges the hydraulic driving blades at the lower end of the desulfurization impeller; at the moment, the water flowing through the water flowing passage can continuously impact the hydraulic driving blade at the position clockwise, so that the hydraulic driving blade drives the impeller hub to continuously rotate clockwise; the clockwise rotation of the impeller hub enables the water scooping blades at the lower end of the impeller hub to continuously scoop up the flue gas showering water flowing through the water circulation passageway clockwise, so that the flue gas showering water is contained in each water scooping lifting groove on the left side of the impeller hub, the flue gas showering water in each water scooping lifting groove on the left side of the impeller hub is gradually lifted along with the clockwise rotation of the impeller hub, and the flue gas showering water in each water scooping lifting groove cannot be leaked through each hollowed hole in the process of being lifted upwards due to the fact that each hollowed hole on the left side of the impeller hub is blocked by the side wall of the left cambered surface; the liquid leakage holes are uniformly distributed on each hydraulic drive blade, so that the flue gas showering water in each water scooping lifting groove is lifted clockwise while part of the flue gas showering water leaks downwards to the water scooping lifting groove below through each liquid leakage hole, the water scooping lifting groove on the left side of the impeller hub receives water while leaking water, the water quantity of the flue gas showering water in the water scooping lifting groove is basically kept unchanged in the process of being lifted clockwise, meanwhile, the flue gas showering water leaking downwards from each liquid leakage hole forms showering rain in the corresponding flue gas desulfurization transfer cavity, and further, stable showering rain is formed in each flue gas desulfurization transfer cavity on the left side of the impeller hub;
with the continuous clockwise rotation of the impeller hub, the flue gas shower water in the water ladling lifting groove on the left side of the impeller hub is finally lifted to the top end position of the impeller hub clockwise, and as the hollowed holes at the top end position of the impeller hub are always in an unblocked state without being blocked, the flue gas shower water in the water ladling lifting groove at the top end position of the impeller hub can continuously leak downwards through the hollowed holes at the top end position of the impeller hub, and as the impeller hub rotates continuously anticlockwise, the flue gas shower water in the water ladling lifting groove can be continuously lifted to the top end position of the impeller hub, and then the hollowed holes at the top end position of the impeller hub can continuously leak downwards, so that the flue gas shower channel can continuously and uniformly drop shower rain;
the smoke gas showering water lifted to the top of the impeller hub by the scooping water lifting groove cannot be completely leaked out by the hollow holes, and the impeller hub continuously rotates clockwise, so that part of smoke gas showering water still remains in each descending groove on the right side of the impeller hub;
step three, on the basis of maintaining the step two, continuously guiding the flue gas to be leached into the flue gas leaching channel through the smoke inlet pipe, continuously leaching the flue gas by first leaching rain in the flue gas leaching channel in the process of flowing through the flue gas leaching channel, guiding the flue gas subjected to the first leaching in the flue gas leaching channel into the flue gas storage cavity through the left smoke guide channel, further guiding the flue gas in the flue gas storage cavity into the upper part of the lower cavity through the smoke return pipe, wherein the impeller hub still rotates clockwise, and the clockwise rotation of the hydraulic drive blades and the water scooping blades on the impeller hub promotes the flue gas in the lower cavity to be continuously transferred into the upper cavity through each flue gas desulfurization transfer cavity in the arc-shaped flue gas channel, and the stable leaching rain exists in the flue gas desulfurization transfer cavity; therefore, the flue gas is subjected to secondary leaching by the flue gas leaching water in the process of passing through the arc-shaped flue gas channel; the following reactions occur in the first leaching process and the second leaching process: SO2+ H2O → H2SO 3; CaCO3+ H2SO3 → CaSO3+ CO2+ H2O; so that the flue gas is leached twice, and the flue gas is fully and thoroughly desulfurized; and the flue gas leached for the second time in the final high-level cavity is guided into the flue gas denitrator through the transition pipe to be subjected to a denitration process.
Has the advantages that: the structure of the invention is simple, the flue gas is continuously leached by the leaching rain in the flue gas leaching channel in the process of flowing through the flue gas leaching channel, the water power on the impeller hub drives the blades and the water scooping blades to rotate clockwise to promote the flue gas in the low-level cavity to be continuously transferred to the high-level cavity through each flue gas desulfurization transfer cavity in the arc-shaped flue gas channel, and the stable leaching rain is in the flue gas desulfurization transfer cavity; therefore, the flue gas is subjected to secondary leaching by the flue gas leaching water in the process of passing through the arc-shaped flue gas channel; the flue gas can be treated by two leaching processes to fully improve the desulfurization effect.
Drawings
FIG. 1 is a schematic view of the overall structure of the device;
FIG. 2 is an overall perspective view of the apparatus;
FIG. 3 is a schematic view of the structure of a circulating desulfurizer;
FIG. 4 is a schematic elevation section view of FIG. 3;
FIG. 5 is a front cross-sectional view of FIG. 3;
FIG. 6 is an enlarged partial schematic view of the middle portion of FIG. 5;
FIG. 7 is a schematic view of the desulfurization impeller shown in FIG. 4 with the impeller removed;
FIG. 8 is a schematic sectional view of the circulating desulfurizer at the axis of the arched shell;
FIG. 9 is a schematic view of a desulfurization impeller structure;
FIG. 10 is a cut-away schematic view of FIG. 9;
FIG. 11 is a schematic view of FIG. 9 with the left and right bearings hidden;
FIG. 12 is an axial cross-sectional view of a desulfurization impeller;
FIG. 13 is a schematic view showing the mutual matching of the left hole-plugging member and the right hole-plugging member.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The flue gas desulfurization and denitration purification system shown in the attached fig. 1 to 13 comprises a flue gas inlet pipe 11, a circulating desulfurizer 1, a flue gas denitration device 6, a transition pipe 2 and a flue gas outlet pipe 7; the smoke inlet pipe 11 is communicated with the smoke inlet end of the circulating desulfurizer 1, the smoke outlet end of the circulating desulfurizer 1 is communicated with the smoke inlet end of the smoke denitrator 6 through the transition pipe 2, and the smoke outlet end of the smoke denitrator 6 is communicated with the smoke outlet pipe 7.
The circulating desulfurizer 1 comprises a long rectangular water tank 3 which is obliquely arranged, and the long rectangular water tank 3 is supported above a ground platform 4 through a plurality of support columns 5; an oblique circulating cavity is arranged in the long rectangular water tank 3, the short end of the circulating cavity is a low-level cavity 16, and the high end of the circulating cavity is a high-level cavity 20; the liquid-liquid separation device further comprises a circulating pipe 8, two ends of the circulating pipe 8 are respectively communicated with the low-position cavity 16 and the high-position cavity 20, a circulating pump 9 is mounted on the circulating pipe 8, and the circulating pump 9 can enable the circulating pipe 8 to suck liquid in the low-position cavity 16 into the high-position cavity 20; the smoke inlet end of the transition pipe 2 is communicated with the upper end of the high-level cavity 20;
the upper side of the middle part of the long rectangular water tank 3 is provided with a semicircular integrated arched shell 13, an impeller cavity is arranged in the arched shell 13, and two sides of the lower part of the impeller cavity are respectively communicated with the lower end of the high-level cavity 20 and the upper end of the low-level cavity 16; a desulfurization impeller is rotationally arranged in an impeller cavity in the arched shell 13; a water flow passage 15 is formed between the lower end of the desulfurization impeller and the lower inclined bottom wall 71 of the long rectangular water tank 3, and water in the high-level cavity 20 can flow to the low-level cavity 16 through the water flow passage 15; and the water flow passing through the water flow passage 15 can drive the desulfurization impeller to rotate clockwise; an arc-shaped flue gas channel 14 is formed between the upper end of the desulfurization impeller and the inner wall of the arch-shaped shell 13, and flue gas in the low-level cavity 16 can flow into the high-level cavity 20 through the arc-shaped flue gas channel 14.
The desulfurization impeller comprises an impeller hub 21, the impeller hub 21 is of a cylindrical structure, and a left bearing barrel 28 and a right bearing barrel 29 are integrally arranged at two ends of the impeller hub 21 coaxially; the left and right bearing barrels 28 and 29; a left smoke guide channel 32 is arranged in the left bearing cylinder 28; the outer walls of the left bearing cylinder 28 and the right bearing cylinder 29 are respectively connected with the inner wall of the arched shell 13 in a rotating and sealing way through a left bearing 25 and a right bearing 27; the left end of the arched shell 13 is integrally connected with a cigarette storage shell 071, and the inner cavity of the cigarette storage shell 071 is a cigarette storage cavity 30; the smoke storage cavity 30 is communicated with the left smoke guide channel 32; the smoke outlet end of the smoke inlet pipe 11 is rotatably sleeved with the inner wall of the right bearing cylinder 29 through a bearing 31, and a smoke inlet channel 11.1 is arranged in the pipe of the smoke inlet pipe 11; the smoke returning pipe 10 is further included, and one end of the smoke returning pipe 10 is communicated with the upper side of the low-level cavity 16; the other end of the smoke returning pipe 10 is communicated with the smoke storage cavity 30.
A plurality of hollowed holes 34 are uniformly and hollowly arranged on the wall of the impeller hub 21 in a circumferential array; the outer edges of the two ends of the impeller hub 21 are respectively and symmetrically provided with a water retaining ring plate 35; a plurality of hydraulic driving blades 38 are distributed on the periphery of the impeller hub 21 in a circumferential array, and two ends of each hydraulic driving blade 38 extend to the two water retaining ring plates 35 which are integrally connected; and each said hydraulic drive blade 38 is inclined 30 ° to 40 ° counterclockwise with respect to the radial direction 42 of the impeller hub 21; a flue gas desulfurization transfer cavity 40 is formed between two adjacent hydraulic driving blades 38 on each impeller hub 21; a descending groove 43 is formed between each hydraulic driving blade 38 at the right side position of the cross section of the impeller hub 21 and the outer wall of the impeller hub 21; a plurality of liquid leakage holes 39 are uniformly distributed on each hydraulic driving blade 38, and liquid in the descending groove 43 can leak downwards through the liquid leakage holes 39;
the blade ends of the hydraulic driving blades 38 are connected with water scooping blades 37 uniformly, and the extending direction of the ends of the water scooping blades 37 is consistent with the tangential line 091 of the impeller hub 21 in the clockwise direction; a water scooping lifting groove 41 is formed between each water scooping blade 37 at the left side position of the impeller hub 21 and the corresponding hydraulic driving blade 38; a left hole blocking piece 17 and a right hole blocking piece 18 are arranged in the cylinder structure of the impeller hub 21; the left hole blocking piece 17 and the right hole blocking piece 18 are both of transverse cylinder structures, the cross section profiles of the cylinders of the left hole blocking piece 17 and the right hole blocking piece 18 are both in a bowstring shape, the left cambered surface side wall 50 of the left hole blocking piece 17 and the right cambered surface side wall 51 of the right hole blocking piece 18 are both in sliding fit with the cylindrical inner wall of the impeller hub 21, and the left cambered surface side wall 50 and the right cambered surface side wall 51 can block the hollow hole 34 at the position; the left plane side wall 48 on the left hole blocking piece 17 and the right plane side wall 49 on the right hole blocking piece 18 are both parallel to the plumb direction, and the left plane side wall 48 and the right plane side wall 49 are arranged at intervals; a flue gas leaching channel 22 is formed between the left plane side wall 48 and the right plane side wall 49, and two ends of the flue gas leaching channel 22 are respectively communicated with the left smoke guide channel 32 and the smoke inlet channel 11.1; one end of the left hole blocking piece 17 and one end of the right hole blocking piece 18 are fixedly connected with the inner wall of the cigarette storage shell 071 through a second support column 23.
The flue gas desulfurization method of the flue gas desulfurization, denitration and purification system, the principle in the desulfurization process, the flue gas trend, the leaching mode and the like are described in detail as follows:
the method comprises the following steps:
injecting a proper amount of flue gas leaching water into a circulating cavity in a long rectangular water tank 3, wherein the flue gas leaching water contains lime turbid liquid for reacting with sulfur dioxide; under the condition that the circulating pump 9 is not started, the flue gas leaching water in the long rectangular water tank 3 is converged at the lower end of the low-level cavity 16 under the action of gravity;
step two, starting the circulating pump 9, so that the circulating pump 9 drives the circulating pipe 8 to continuously pump the flue gas leaching water in the low-level cavity 16 into the high-level cavity 20, the flue gas leaching water entering the high-level cavity 20 flows downwards along the slope of the lower inclined bottom wall 71, and then the flue gas leaching water in the high-level cavity 20 continuously flows back to the low-level cavity 16 through the water circulation passage 15 again, so that water circulation is formed in the long rectangular water tank 3; so that water flows downwards all the time in the water flow passage 15, and the water flowing in the water flow passage 15 continuously submerges the hydraulic driving blades 38 at the lower end position of the desulfurization impeller; at this time, the water flowing through the water flowing passageway 15 can continuously impact the hydraulic driving blade 38 at the position clockwise, so that the hydraulic driving blade 38 drives the impeller hub 21 to continuously rotate clockwise; the clockwise rotation of the impeller hub 21 enables the water scooping blades 37 at the lower end of the impeller hub 21 to continuously scoop up the flue gas shower water flowing through the water circulation passageway 15 clockwise, so that the water scooping lifting grooves 41 at the left side of the impeller hub 21 are filled with the flue gas shower water, the flue gas shower water in the water scooping lifting grooves 41 at the left side of the impeller hub 21 is gradually lifted along with the clockwise rotation of the impeller hub 21, and as the hollow holes 34 at the left side of the impeller hub 21 are blocked by the left cambered side wall 50, the flue gas shower water in the water scooping lifting grooves 41 cannot leak through the hollow holes 34 in the upward lifting process; since the liquid leakage holes 39 are uniformly distributed on each hydraulic driving blade 38, the flue gas showering water in each water scooping lifting groove 41 is lifted clockwise, and simultaneously, part of the flue gas showering water leaks downwards to the water scooping lifting groove 41 below through each liquid leakage hole 39, the water scooping lifting groove 41 on the left side of the impeller hub 21 receives water while leaking water, so that the water quantity of the flue gas showering water in the water scooping lifting groove 41 is basically kept unchanged in the process of being lifted clockwise, meanwhile, the flue gas showering water leaking downwards from each liquid leakage hole 39 forms showering rain in the corresponding flue gas desulfurization transfer cavity 40, and further, stable showering rain is formed in each flue gas desulfurization transfer cavity 40 on the left side of the impeller hub 21;
with the continuous clockwise rotation of the impeller hub 21, the flue gas shower water in the water scooping lifting groove 41 on the left side of the impeller hub 21 is finally lifted clockwise to the top end position of the impeller hub 21, because each hollowed hole 34 at the top end position of the impeller hub 21 is always in an unblocked state without being blocked, the flue gas shower water in the water scooping lifting groove 41 at the top end position of the impeller hub 21 can continuously leak downwards through the plurality of hollowed holes 34 at the top end position of the impeller hub 21, because the impeller hub 21 rotates continuously counterclockwise, the flue gas shower water in the water scooping lifting groove 41 can be continuously lifted to the top end position of the impeller hub 21, and then the plurality of hollowed holes 34 at the top end position of the impeller hub 21 can continuously leak downwards, so that the flue gas shower rain which continuously and uniformly falls is generated in the flue gas shower channel 22;
the flue gas shower water lifted to the top of the impeller hub 21 by the scooping water lifting groove 41 cannot be completely leaked out by the hollow holes 34, and the impeller hub 21 continuously rotates clockwise, so that residual flue gas shower water can be remained in the descending grooves 43 on the right side of the impeller hub 21, and as the hollow holes 34 on the right side of the impeller hub 21 are blocked by the right cambered side wall 51, the liquid accumulated in the water receiving descending grooves 43 on the right side of the impeller hub 21 cannot overflow inwards through the hollow holes 34, so that the flue gas shower water in the descending grooves 43 on the right side of the desulfurization roller 24 leaks into the descending grooves 43 below through the liquid leakage holes 39, and can continuously leak water downwards, and further, stable shower rain is formed in the flue gas desulfurization transfer cavities 40 on the right side of the impeller hub 21;
step three, on the basis of maintaining the step two, the flue gas to be leached is continuously led into the flue gas leaching channel 22 through the smoke inlet pipe 11, the flue gas is continuously leached by the first leaching rain in the flue gas leaching channel 22 in the process of flowing through the flue gas leaching channel 22, the flue gas after being leached by the first leaching rain in the flue gas leaching channel 22 is led into the smoke storage cavity 30 through the left smoke guide channel 32, and then the flue gas in the smoke storage cavity 30 is led into the upper part of the low-level cavity 16 through the smoke return pipe 10, at the moment, the impeller hub 21 still rotates clockwise, the hydraulic driving blades 38 and the water scooping blades 37 on the impeller hub 21 rotate clockwise to promote the flue gas in the low-level cavity 16 to be continuously transferred into the high-level cavity 20 through the flue gas desulfurization transfer cavities 40 in the arc-shaped flue gas channel 14, and the stable leaching rain is in the flue gas desulfurization transfer cavities 40; therefore, the flue gas is subjected to secondary leaching by the flue gas leaching water in the process of passing through the arc-shaped flue gas channel 14; the following reactions occur in the first leaching process and the second leaching process: SO2+ H2O → H2SO 3; CaCO3+ H2SO3 → CaSO3+ CO2+ H2O; so that the flue gas is leached twice, and the flue gas is fully and thoroughly desulfurized; the flue gas leached for the second time in the final high-level cavity 20 is guided into the flue gas denitrator 6 through the transition pipe 2 to be subjected to the denitration process.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (2)
1. The utility model provides a flue gas desulfurization denitration clean system which characterized in that: comprises a smoke inlet pipe (11), a circulating desulfurizer (1), a smoke denitrator (6), a transition pipe (2) and a smoke outlet pipe (7); the smoke inlet pipe (11) is communicated with the smoke inlet end of the circulating desulfurizer (1), the smoke outlet end of the circulating desulfurizer (1) is communicated with the smoke inlet end of the smoke denitrator (6) through the transition pipe (2), and the smoke outlet end of the smoke denitrator (6) is communicated with the smoke outlet pipe (7);
the circulating desulfurizer (1) comprises a long rectangular water tank (3) which is obliquely arranged, and the long rectangular water tank (3) is supported above a ground platform (4) through a plurality of support columns (5); an oblique circulating cavity is arranged in the long rectangular water tank (3), the short end of the circulating cavity is a low-level cavity (16), and the high end of the circulating cavity is a high-level cavity (20); the liquid-absorbing device is characterized by further comprising a circulating pipe (8), two ends of the circulating pipe (8) are respectively communicated with the low-position cavity (16) and the high-position cavity (20), a circulating pump (9) is mounted on the circulating pipe (8), and the circulating pump (9) can enable the circulating pipe (8) to suck liquid in the low-position cavity (16) into the high-position cavity (20); the smoke inlet end of the transition pipe (2) is communicated with the upper end of the high-level cavity (20);
the upper side of the middle part of the long rectangular water tank (3) is provided with a semicircular integrated arched shell (13), an impeller cavity is arranged in the arched shell (13), and two sides of the lower part of the impeller cavity are respectively communicated with the lower end of the high-level cavity (20) and the upper end of the low-level cavity (16); a desulfurization impeller is rotationally arranged in an impeller cavity in the arched shell (13); a water circulation passage (15) is formed between the lower end of the desulfurization impeller and the lower inclined bottom wall (71) of the long rectangular water tank (3), and water in the high-level cavity (20) can flow to the low-level cavity (16) through the water circulation passage (15); the water flow flowing through the water flow passage (15) can drive the desulfurization impeller to rotate clockwise; an arc-shaped flue gas channel (14) is formed between the upper end of the desulfurization impeller and the inner wall of the arch-shaped shell (13), and flue gas in the low-level cavity (16) can flow into the high-level cavity (20) through the arc-shaped flue gas channel (14);
the desulfurization impeller comprises an impeller hub (21), the impeller hub (21) is of a cylindrical structure, and a left bearing barrel (28) and a right bearing barrel (29) are integrally arranged at two ends of the impeller hub (21) coaxially; the left bearing cylinder (28) and the right bearing cylinder (29); a left smoke guide channel (32) is arranged in the left bearing cylinder (28); the outer walls of the left bearing cylinder (28) and the right bearing cylinder (29) are respectively connected with the inner wall of the arch-shaped shell (13) in a rotating and sealing way through a left bearing (25) and a right bearing (27); the left end of the arched shell (13) is integrally connected with a cigarette storage shell (071), and the inner cavity of the cigarette storage shell (071) is a cigarette storage cavity (30); the smoke storage cavity (30) is communicated with the left smoke guide channel (32); the smoke outlet end of the smoke inlet pipe (11) is rotatably sleeved with the inner wall of the right bearing cylinder (29) through a bearing (31), and a smoke inlet channel (11.1) is arranged in the pipe of the smoke inlet pipe (11); the smoke returning pipe (10) is further included, and one end of the smoke returning pipe (10) is communicated with the upper side of the low-level cavity (16); the other end of the smoke returning pipe (10) is communicated with the smoke storage cavity (30);
a plurality of hollowed holes (34) are uniformly and hollowly arranged on the wall of the impeller hub (21) in a circumferential array; the outer edges of two ends of the impeller hub (21) are respectively and symmetrically provided with water retaining ring plates (35); a plurality of hydraulic driving blades (38) are distributed on the periphery of the impeller hub (21) in a circumferential array, and two ends of each hydraulic driving blade (38) extend to be integrally connected with two water retaining ring plates (35) respectively; and each said hydraulic drive blade (38) is inclined 30 to 40 ° counter-clockwise with respect to a radial direction (42) of the impeller hub (21); a flue gas desulfurization transfer cavity (40) is formed between two adjacent hydraulic drive blades (38) on each impeller hub (21); a descending groove (43) is formed between each hydraulic driving blade (38) at the right side position of the cross section of the impeller hub (21) and the outer wall of the impeller hub (21); a plurality of liquid leakage holes (39) are uniformly distributed on each hydraulic driving blade (38), and liquid in the descending groove (43) can leak downwards through the liquid leakage holes (39);
the tail end of each hydraulic driving blade (38) is uniformly connected with a water scooping blade (37), and the extending direction of the tail end of each water scooping blade (37) is consistent with the clockwise direction of a tangent line (091) of the impeller hub (21); a water scooping lifting groove (41) is formed between each water scooping blade (37) at the left side position of the impeller hub (21) and the corresponding hydraulic driving blade (38); a left hole plugging piece (17) and a right hole plugging piece (18) are arranged in the cylinder structure of the impeller hub (21); the left hole plugging piece (17) and the right hole plugging piece (18) are both of a transverse cylinder structure, the cross section profiles of the cylinders of the left hole plugging piece (17) and the right hole plugging piece (18) are both in a bow-string shape, the left cambered surface side wall (50) of the left hole plugging piece (17) and the right cambered surface side wall (51) of the right hole plugging piece (18) are both in sliding fit with the cylindrical inner wall of the impeller hub (21), and the left cambered surface side wall (50) and the right cambered surface side wall (51) can both block the hollow hole (34) at the position; a left plane side wall (48) on the left plugging piece (17) and a right plane side wall (49) on the right plugging piece (18) are both parallel to the plumb direction, and the left plane side wall (48) and the right plane side wall (49) are arranged at intervals; a flue gas washing channel (22) is formed between the left plane side wall (48) and the right plane side wall (49), and two ends of the flue gas washing channel (22) are respectively communicated with the left smoke guide channel (32) and the smoke inlet channel (11.1); one end of the left hole plugging piece (17) and one end of the right hole plugging piece (18) are fixedly connected with the inner wall of the cigarette storage shell (071) through a second support column (23).
2. The flue gas desulfurization method of the flue gas desulfurization, denitration and purification system according to claim 1, characterized in that: the method comprises the following steps:
injecting a proper amount of flue gas leaching water into a circulating cavity in a long rectangular water tank (3), wherein the flue gas leaching water contains lime turbid liquid for reacting with sulfur dioxide; under the condition that the circulating pump (9) is not started, the flue gas showering water in the long rectangular water tank (3) can be collected at the lower end of the low-level cavity (16) under the action of gravity;
step two, starting a circulating pump (9), so that the circulating pump (9) drives a circulating pipe (8) to continuously pump the flue gas leaching water in the low-level cavity (16) into the high-level cavity (20), the flue gas leaching water entering the high-level cavity (20) flows downwards along the slope of the lower inclined bottom wall (71), and the flue gas leaching water in the high-level cavity (20) continuously flows back to the low-level cavity (16) through a water circulation passage (15), so that water circulation is formed in the long rectangular water tank (3); so that water flow always flows downwards in the water circulation passage (15), and the water flowing in the water circulation passage (15) continuously submerges the hydraulic driving blades (38) at the lower end of the desulfurization impeller; at the moment, the water flowing through the water flowing passageway (15) can continuously impact the hydraulic driving blade (38) at the position clockwise, so that the hydraulic driving blade (38) drives the impeller hub (21) to continuously rotate clockwise; the clockwise rotation of the impeller hub (21) enables the water scooping blades (37) at the lower end of the impeller hub (21) to continuously scoop up the flue gas showering water flowing through the water circulation passageway (15) clockwise, so that the flue gas showering water is contained in each water scooping lifting groove (41) on the left side of the impeller hub (21), the flue gas showering water in each water scooping lifting groove (41) on the left side of the impeller hub (21) is gradually lifted along with the clockwise rotation of the impeller hub (21), and as each hollowed-out hole (34) on the left side of the impeller hub (21) is blocked by the left cambered side wall (50), the flue gas showering water in each water scooping lifting groove (41) cannot leak through each hollowed-out hole (34) in the process of being lifted upwards; the liquid leakage holes (39) are uniformly distributed on each hydraulic driving blade (38), so that the flue gas showering water in each water scooping lifting groove (41) is lifted clockwise while part of the flue gas showering water leaks into the water scooping lifting groove (41) below through each liquid leakage hole (39), the water scooping lifting groove (41) on the left side of the impeller hub (21) receives water while leaking water, the water quantity of the flue gas showering water in the water scooping lifting groove (41) is basically kept unchanged in the process of being lifted clockwise, meanwhile, the flue gas showering water leaking from each liquid leakage hole (39) forms showering rain in the corresponding flue gas desulfurization transfer cavity (40), and further stable showering rain is formed in each flue gas desulfurization transfer cavity (40) on the left side of the impeller hub (21);
with the continuous clockwise rotation of the impeller hub (21), the flue gas showering water in the water scooping lifting groove (41) on the left side of the impeller hub (21) is finally lifted to the top end position of the impeller hub (21) clockwise, because each hollowed hole (34) on the top end position of the impeller hub (21) is always in an unblocked state without being blocked, the flue gas showering water in the water scooping lifting groove (41) on the top end position of the impeller hub (21) can continuously leak downwards through a plurality of hollowed holes (34) on the top end position of the impeller hub (21), because the impeller hub (21) rotates continuously counterclockwise, the flue gas showering water in the water scooping lifting groove (41) can be continuously lifted to the top end position of the impeller hub (21), and a plurality of hollowed holes (34) on the top end position of the impeller hub (21) can continuously leak downwards, so as to generate continuous and uniform falling leaching rain in the flue gas leaching channel (22);
the flue gas showering water lifted to the top of the impeller hub (21) by the water scooping lifting groove (41) cannot be completely leaked out by the hollow holes (34), and the impeller hub (21) continuously rotates clockwise, further, partial flue gas showering water still remains in each descending groove (43) at the right side of the impeller hub (21), because each hollowed-out hole (34) on the right side of the impeller hub (21) is blocked by the right cambered side wall (51), further, the liquid accumulated in the right water receiving descending groove (43) of the impeller hub (21) can not overflow inwards through the hollow holes (34), further, the flue gas showering water in each descending groove (43) at the right side of the desulfurization roller (24) is leaked downwards to the descending groove (43) at the lower part through each liquid leakage hole (39) and can continuously leak downwards, further, stable leaching rain is formed in each flue gas desulfurization transfer cavity (40) on the right side of the impeller hub (21);
step three, on the basis of maintaining the step two, the flue gas to be leached is continuously led into the flue gas leaching channel (22) through the smoke inlet pipe (11), the flue gas is continuously leached by the first leaching rain in the flue gas leaching channel (22) in the process of flowing through the flue gas leaching channel (22), the flue gas after being leached by the first leaching rain in the flue gas leaching channel (22) is led into the smoke storage cavity (30) through the left smoke guide channel (32), and then the flue gas in the smoke storage cavity (30) is led into the upper part of the low-level cavity (16) through the smoke return pipe (10), at the moment, the impeller hub (21) still rotates clockwise, the clockwise rotation of the hydraulic drive blades (38) and the water scooping blades (37) on the impeller hub (21) promotes the flue gas in the low-level cavity (16) to be continuously transferred into the high-level cavity (20) through each flue gas desulfurization transfer cavity (40) in the arc-shaped flue gas channel (14), the stable leaching rain is arranged in the flue gas desulfurization transfer cavity (40); therefore, the flue gas is subjected to secondary leaching of flue gas leaching water in the process of passing through the arc-shaped flue gas channel (14); the following reactions occur in the first leaching process and the second leaching process: SO2+ H2O → H2SO 3; CaCO3+ H2SO3 → CaSO3+ CO2+ H2O; so that the flue gas is leached twice, and the flue gas is fully and thoroughly desulfurized; the flue gas leached for the second time in the final high-level cavity (20) is guided into a flue gas denitrator (6) through a transition pipe (2) to carry out a denitration process.
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