CN111661970A - Waste water treatment device of limestone-gypsum wet flue gas desulfurization system - Google Patents
Waste water treatment device of limestone-gypsum wet flue gas desulfurization system Download PDFInfo
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- CN111661970A CN111661970A CN202010545027.4A CN202010545027A CN111661970A CN 111661970 A CN111661970 A CN 111661970A CN 202010545027 A CN202010545027 A CN 202010545027A CN 111661970 A CN111661970 A CN 111661970A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/18—Evaporating by spraying to obtain dry solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/68—Regeneration of the filtering material or filter elements inside the filter by means acting on the cake side involving movement with regard to the filter elements
- B01D46/681—Regeneration of the filtering material or filter elements inside the filter by means acting on the cake side involving movement with regard to the filter elements by scrapers, brushes or the like
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
- C02F1/12—Spray evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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Abstract
The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment device of a limestone-gypsum wet flue gas desulfurization system, which comprises a desulfurization wastewater pool, a pretreatment pool and the like, wherein the desulfurization wastewater pool is communicated with the side wall of the pretreatment pool through a first wastewater conveying pipe, and the outer wall of the pretreatment pool is communicated with a spraying structure arranged at the top of a spray dryer through a second wastewater conveying pipe; the spray dryer is provided with a hot air inlet, a dry material outlet and a wet flue gas outlet; the bottom of the dust removing equipment is provided with a material collecting hopper, the bottom end of the material collecting hopper is provided with a solid particle outlet, and the right end of the dust removing equipment is provided with an air outlet; the exhaust port is communicated with a smoke exhaust fan through a first exhaust pipe, and the smoke exhaust fan is communicated with a chimney through a second exhaust pipe; in the invention, after the sewage is atomized, the contact with hot air in the spraying structure is more uniform, and the efficiency of drying and solidifying the sewage is improved; meanwhile, dry powder waste materials bonded on the inner wall of the spray dryer can be cleaned.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment device of a limestone-gypsum wet flue gas desulfurization system.
Background
As a country with poor oil, less gas and relatively rich coal, China has coal resources accounting for 70 percent of primary energy. In addition, coal-fired power generation is still a main solution for increasing electricity demand in China for a long time in the future. Coal fired in thermal power generation brings a large amount of sulfur dioxide, which is a main atmospheric pollutant causing acid rain and needs to be strictly controlled. At present, the wet limestone-gypsum process is mostly adopted for domestic flue gas desulfurization. The process is the flue gas desulfurization process which is most widely applied and has the most mature technology in the world at present, and has the advantages of high desulfurization efficiency, quick load response, wide range of coal used, mature gypsum utilization technology, low operation cost and the like.
Limestone-gypsum wet flue gas desulfurization slurry is continuously circulated and is in direct contact with flue gas, pollutants are transferred into the slurry, and Cl & lt- & gt is continuously enriched in the continuous operation process, so that the corrosion of equipment is accelerated, and the desulfurization efficiency is influenced. Therefore, in order to ensure the better operation effect of the system, partial waste water needs to be discharged periodically. The discharged wastewater has the following characteristics along with the fluctuation of concentration ratio of raw materials and slurry:
(1) the pH value of the wastewater is 4.0-6.5, and the wastewater is weakly acidic;
(2) the waste water has large suspended matter content and high turbidity, and is mainly gypsum particles and SiO2Etc.;
(3) the wastewater contains various heavy metals and other pollutants, such As Cr, As, Cd, Pb and Hg (first-class pollutants) and Cu, Zn, sulfides and the like (second-class pollutants);
(4) wastewater containing saltHigh content, mainly containing Cl-and Ca2+、Mg2+、SO42-And inorganic ions.
For example, the invention with patent number CN200710188081.2 discloses a method and a system for treating desulfurization wastewater, which is suitable for treating wastewater generated after limestone-gypsum wet flue gas desulfurization and other wastewater with high salt content, and the system comprises: a spray dryer, a flue gas conveying pipeline, a dust remover, a smoke exhaust fan, a waste ash discharge outlet and the like; the method utilizes the convective contact heat exchange between hot flue gas and desulfurization wastewater in a spray dryer to change the wastewater into particles and wet flue gas, the settled particles are discharged, and the wet flue gas and suspended particles are pumped away after passing through a dust remover. However, the invention still has a plurality of defects, for example, the waste water is not uniformly distributed in a spray dryer after being atomized, and the drying and solidifying effect on the sewage is not ideal; the inner wall of the spray dryer is stained with powder, which is not convenient for cleaning.
Disclosure of Invention
Aiming at the defects of the existing wastewater treatment device, the invention designs the wastewater treatment device of the limestone-gypsum wet flue gas desulfurization system, which can effectively solve the technical problems.
The invention is realized by the following technical scheme:
a waste water treatment device of a limestone-gypsum wet flue gas desulfurization system comprises a desulfurization waste water tank, a pretreatment tank, a spray dryer, a dust removal device and a smoke exhaust fan, wherein the desulfurization waste water tank is communicated with the side wall of the pretreatment tank through a first waste water conveying pipe, the outer wall of the pretreatment tank is communicated with a spraying structure arranged at the top of the spray dryer through a second waste water conveying pipe, and centrifugal water pumps are arranged on the first waste water conveying pipe and the second waste water conveying pipe;
the spraying structure comprises a connecting pipe, a main spraying pipe and spraying branch pipes, wherein a sealing bearing is fixed on the inner wall of the connecting pipe, the inner ring of the sealing bearing is fixed on the outer wall of the top end of the first wastewater conveying pipe, a gear ring is fixed on the outer wall of the connecting pipe, a driving gear is meshed with the outer wall of the gear ring, the driving gear is driven by a first driving motor, the bottom end of the connecting pipe is communicated with the main spraying pipe, the bottom end of the main spraying pipe is communicated with the two vertically crossed spraying branch pipes, and a plurality of atomizing nozzles are uniformly arranged on the lower pipe walls of the spraying branch pipes;
the spray dryer is provided with a hot air inlet, a dry material outlet and a wet flue gas outlet, one end of the hot air inlet is sequentially communicated with an external heater and an external air filter through an air inlet pipe, the other end of the hot air inlet is communicated with a hot air distributor in the spray dryer, and the wet flue gas outlet is communicated with a dust removal device through a wet flue gas conveying pipe;
a filter screen is obliquely arranged in the dust removing equipment, a cleaning mechanism is arranged on the lower surface of the filter screen, a material collecting hopper is arranged at the bottom of the dust removing equipment, a solid particle outlet is arranged at the bottom end of the material collecting hopper, and an exhaust port is arranged at the right end of the dust removing equipment;
the exhaust port is communicated with the smoke exhaust fan through a first exhaust pipe, and the smoke exhaust fan is communicated with the chimney through a second exhaust pipe.
As a further arrangement of the above scheme, a pair of connecting rods is fixed on the outer wall of the connecting pipe, and the tail ends of the pair of connecting rods are both fixed with scraping blades which are in contact with the inner wall of the spray dryer.
As a further arrangement of the scheme, the connecting rod and the scraping blade are both made of anti-corrosion and wear-resistant materials.
As a further arrangement of the above scheme, the cleaning mechanism comprises a cleaning blade, a rotating shaft and a second driving motor, the second driving motor is installed at the top of the dust removing device through a blood fixing block, the output end of the second driving motor is provided with the rotating shaft, and the rotating shaft penetrates through the filter screen and the cleaning blade to be fixed.
As a further arrangement of the above scheme, the cleaning blade is serrated, and the cleaning blade is arranged in parallel with and in contact with the lower surface of the filter screen.
As a further arrangement of the scheme, an interception net is arranged at the joint of the desulfurization wastewater pool and the first wastewater conveying pipe.
As a further arrangement of the proposal, the alkaline neutralizing agent NaOH or Ca (OH) is put into the pretreatment tank2And heavy metal ions in the wastewater can generate hydroxide precipitates while the pH value is adjusted.
As the further setting of above-mentioned scheme, spray dryer's bottom is equipped with the supporting leg, spray dryer's outer wall is equipped with the control box, inside control panel and the operating condition display lamp of being equipped with of control box.
As a further arrangement of the scheme, the outer wall of the dry material outlet and the outer wall of the solid particle outlet are both provided with discharge valves.
As a further configuration of the above scheme, the processing procedure comprises the following steps:
the method comprises the following steps: the wastewater enters a pretreatment tank through a first wastewater conveying pipe and a centrifugal water pump, and an alkaline neutralizer is put into the pretreatment tank, so that heavy metal ions in the wastewater can generate hydroxide precipitates;
step two: the pretreated waste water enters a spray dryer through a centrifugal water pump with two waste water conveying pipe holes, and the waste water is sprayed out from an atomizing nozzle and directly contacts with hot air in the spray dryer for heat exchange to form dry powder waste;
step three: the dry powder waste falls into the bottom of the spray dryer under the self gravity, and the waste can be discharged from a dry material outlet by opening a discharge valve;
step four: wet flue gas in the spray dryer and suspended dry powder enter the dust removing equipment through the first exhaust pipe;
step five: under the action of the filter screen, the suspended dry powder is settled into the collecting hopper and is discharged from the solid particle outlet; and finally, discharging the wet flue gas through a second exhaust pipe and a chimney under the action of a smoke exhaust fan.
Has the advantages that:
1. according to the invention, the driving gear can be driven to rotate after the first driving motor is electrified, and the driving gear is meshed with the gear ring which is fixed on the outer wall of the connecting pipe, so that the whole spraying structure can be driven to rotate, the contact between the inside of the spraying structure and hot air after sewage atomization is more uniform, the efficiency of drying and curing the sewage is improved, the size of dry powder waste particles is more uniform, and the subsequent discharge is facilitated.
2. According to the invention, the outer wall of the connecting pipe is fixed with the pair of connecting rods, the tail ends of the pair of connecting rods are respectively fixed with the scraping blade, the scraping blades are contacted with the inner wall of the spray dryer, and the scraping blades can be further driven to rotate along the inner wall of the spray dryer after the first driving motor is electrified, so that dry powder waste can be prevented from being bonded on the inner wall of the spray dryer.
3. According to the invention, the cleaning mechanism is arranged on the lower surface of the filter screen and comprises the cleaning blade, the rotating shaft and the second driving motor, and the second driving motor drives the cleaning blade to rotate after being electrified, so that dust accumulated on the lower surface of the filter screen can be cleaned, the filtering efficiency of the filter screen can be improved, and the filter holes can be prevented from being blocked by the dust.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a schematic view showing the internal structure of the spray dryer of the present invention;
FIG. 3 is a schematic structural view of a spray structure according to the present invention;
FIG. 4 is a schematic view showing the construction of a desulfurization waste water tank and a pretreatment tank in the present invention;
FIG. 5 is a perspective view of the dust removing apparatus according to the present invention;
FIG. 6 is a schematic view of the internal structure of the dust removing apparatus of the present invention;
FIG. 7 is a perspective view of the control box of the present invention after being opened;
fig. 8 is a schematic view of the internal structure of a spray dryer in example 2 of the present invention.
Wherein, 1-desulfurization wastewater pool, 2-pretreatment pool, 3-spray dryer, 301-hot air inlet, 302-dry material outlet, 303-wet flue gas outlet, 304-air inlet pipe, 305-heater, 306-air filter, 307-hot air distributor, 308-supporting leg, 309-control box, 4-dust removing equipment, 401-filter screen, 402-collecting hopper, 403-solid particle outlet, 404-exhaust port, 5-smoke exhaust fan, 6-first wastewater delivery pipe, 7-spraying structure, 701-connecting pipe, 702-spraying main pipe, 703-spraying branch pipe, 704-sealing bearing, 705-gear ring, 706-atomizing nozzle, 8-cleaning mechanism, 801-cleaning blade, 802-rotating shaft, 803-second driving motor, 9-centrifugal water pump, 10-second waste water conveying pipe, 11-driving gear, 12-first driving motor, 13-wet flue gas conveying pipe, 14-first exhaust pipe, 15-second exhaust pipe, 16-chimney, 17-connecting rod, 18-scraper, 19-intercepting net and 20-discharge valve.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all 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 application.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The bag-type dust collector of the present invention will be described in detail with reference to the accompanying drawings 1 to 8.
Example 1
Example 1 describes a wastewater treatment plant for a limestone-gypsum wet flue gas desulfurization system, including a de-desulfurization unit, with reference to FIGS. 1 and 4The desulfurization waste water treatment device comprises a sulfur waste water tank 1, a pretreatment tank 2, a spray dryer 3, a dust removal device 4 and a smoke exhaust fan 5, wherein the desulfurization waste water tank 1 is communicated with the side wall of the pretreatment tank 2 through a first waste water conveying pipe 6, the outer wall of the pretreatment tank 2 is communicated with a spraying structure 7 arranged at the top of the spray dryer 3 through a second waste water conveying pipe 10, and centrifugal water pumps 9 are arranged on the first waste water conveying pipe 6 and the second waste water conveying pipe 10; wherein, an interception net 19 is arranged at the joint of the desulfurization wastewater pool 1 and the first wastewater delivery pipe 6; alkaline neutralizing agent NaOH or Ca (OH) is put into the pretreatment pool 22While adjusting the pH value, heavy metal ions in the wastewater can generate hydroxide precipitates;
referring to fig. 2 and fig. 3, the spraying structure 7 includes a connecting pipe 701, a main spraying pipe 702 and branch spraying pipes 703, a sealing bearing 704 is fixed on the inner wall of the connecting pipe 701, the inner ring of the sealing bearing 704 is fixed on the outer wall of the top end of the first wastewater delivery pipe 6, a gear ring 705 is fixed on the outer wall of the connecting pipe 701, a driving gear 11 is engaged with the outer wall of the gear ring 705, the driving gear 11 is driven by a first driving motor 12, the bottom end of the connecting pipe 701 and the main spraying pipe 702 are connected with two vertically intersecting branch spraying pipes 703, and 5 atomizing nozzles 706 are uniformly arranged on the lower pipe walls of the branch spraying pipes 703; first driving motor 12 circular telegram back can drive driving gear 11 and rotate, because be connected for the meshing between driving gear 11 and the ring gear 705, and ring gear 705 is fixed in connecting pipe 701 outer wall, and then can drive whole spray structure 7 and rotate to it is more even to spray structure 7 inside and hot-air contact after the sewage atomization, has improved the efficiency of the dry solidification of sewage simultaneously, and the size of dry powder waste material granule is also more even, is favorable to subsequent row material.
Referring to fig. 2, the spray dryer 3 is provided with a hot air inlet 301, a dry material outlet 302 and a wet flue gas outlet 303, one end of the hot air inlet 301 is sequentially communicated with an external heater 305 and an air filter 306 through an air inlet pipe 304, the other end of the hot air inlet 301 is communicated with a hot air distributor 307 inside the spray dryer 3, and the wet flue gas outlet 303 is communicated with the dust removing device 4 through a wet flue gas conveying pipe 13; the bottom end of the spray dryer 3 is provided with a supporting leg 308, the outer wall of the spray dryer 3 is provided with a control box 309, referring to fig. 7, a control panel and a working state display lamp are arranged inside the control box 309;
referring to fig. 5 and 6, a filter screen 401 is obliquely installed inside the dust removing device 4, a cleaning mechanism 8 is installed on the lower surface of the filter screen 401, wherein the cleaning mechanism 8 includes a cleaning blade 801, a rotating shaft 802 and a second driving motor 803, the second driving motor 803 is installed on the top of the dust removing device 4 through a blood fixing block, the output end of the second driving motor 803 is provided with the rotating shaft 802, the rotating shaft 802 penetrates through the filter screen 401 to be fixed with 2 cleaning blades 801, the cleaning blades 801 are zigzag, and the cleaning blades 801 are arranged in parallel to and in contact with the lower surface of the filter screen 401; the bottom of the dust removing device 4 is provided with a collecting hopper 402, the bottom end of the collecting hopper 402 is provided with a solid particle outlet 403, and the right end of the dust removing device 4 is provided with an air outlet 404; the outer wall of the dry material outlet 302 and the outer wall of the solid particle outlet 403 are both provided with a discharge valve 20;
referring to fig. 1, the exhaust port 404 communicates with the smoke exhaust fan 5 through the first exhaust duct 14, and the smoke exhaust fan 5 communicates with the chimney 16 through the second exhaust duct 15.
When the embodiment is used specifically, the method comprises the following steps:
the method comprises the following steps: the wastewater enters the pretreatment tank 2 through the first wastewater conveying pipe 6 and the centrifugal water pump 9, and the alkaline neutralizer is put into the pretreatment tank 2, so that hydroxide precipitates can be generated from heavy metal ions in the wastewater;
step two: the pretreated waste water enters the spray dryer 3 through the centrifugal water pump 9 with two waste water conveying pipe holes, and the waste water is sprayed out from the atomizing nozzle 706 to directly contact with hot air in the spray dryer 3 for heat exchange to form dry powder waste;
step three: the dry powder waste falls into the bottom of the spray dryer 3 under the self gravity, and the waste can be discharged from the dry material outlet 302 by opening the discharge valve 20;
step four: wet flue gas in the spray dryer 3 and suspended dry powder enter the dust removing device 4 through the first exhaust pipe 14;
step five: under the action of the filter screen 401, suspended dry powder is settled into the collection hopper 402 and discharged from the solid particle outlet 403; the wet flue gas is finally exhausted through a second exhaust pipe 15 and a chimney 16 under the action of the smoke exhaust fan 5.
Example 2
referring to fig. 2 and fig. 3, the spraying structure 7 includes a connecting pipe 701, a main spraying pipe 702 and branch spraying pipes 703, a sealing bearing 704 is fixed on the inner wall of the connecting pipe 701, the inner ring of the sealing bearing 704 is fixed on the outer wall of the top end of the first wastewater delivery pipe 6, a gear ring 705 is fixed on the outer wall of the connecting pipe 701, a driving gear 11 is engaged with the outer wall of the gear ring 705, the driving gear 11 is driven by a first driving motor 12, the bottom end of the connecting pipe 701 and the main spraying pipe 702 are connected with two vertically intersecting branch spraying pipes 703, and 5 atomizing nozzles 706 are uniformly arranged on the lower pipe walls of the branch spraying pipes 703;
referring to fig. 2, the spray dryer 3 is provided with a hot air inlet 301, a dry material outlet 302 and a wet flue gas outlet 303, one end of the hot air inlet 301 is sequentially communicated with an external heater 305 and an air filter 306 through an air inlet pipe 304, the other end of the hot air inlet 301 is communicated with a hot air distributor 307 inside the spray dryer 3, and the wet flue gas outlet 303 is communicated with the dust removing device 4 through a wet flue gas conveying pipe 13; the bottom end of the spray dryer 3 is provided with a supporting leg 308, the outer wall of the spray dryer 3 is provided with a control box 309, referring to fig. 7, a control panel and a working state display lamp are arranged inside the control box 309;
referring to fig. 5 and 6, a filter screen 401 is obliquely installed inside the dust removing device 4, a cleaning mechanism 8 is installed on the lower surface of the filter screen 401, wherein the cleaning mechanism 8 includes a cleaning blade 801, a rotating shaft 802 and a second driving motor 803, the second driving motor 803 is installed on the top of the dust removing device 4 through a blood fixing block, the output end of the second driving motor 803 is provided with the rotating shaft 802, the rotating shaft 802 penetrates through the filter screen 401 to be fixed with 2 cleaning blades 801, the cleaning blades 801 are zigzag, and the cleaning blades 801 are arranged in parallel to and in contact with the lower surface of the filter screen 401; the bottom of the dust removing device 4 is provided with a collecting hopper 402, the bottom end of the collecting hopper 402 is provided with a solid particle outlet 403, and the right end of the dust removing device 4 is provided with an air outlet 404; the outer wall of the dry material outlet 302 and the outer wall of the solid particle outlet 403 are both provided with a discharge valve 20;
referring to fig. 1, the exhaust port 404 communicates with the smoke exhaust fan 5 through the first exhaust duct 14, and the smoke exhaust fan 5 communicates with the chimney 16 through the second exhaust duct 15.
Referring to fig. 7, a pair of connecting rods 17 are fixed to the outer wall of the connecting pipe 701, a scraper 18 is fixed to the ends of the pair of connecting rods 17, and the scraper 18 contacts with the inner wall of the spray dryer 3; the connecting rod 17 and the scraping blade 18 are both made of anti-corrosion and wear-resistant materials; the first driving motor 12 can further drive the scraping blade 18 to rotate along the inner wall of the spray dryer 3 after being electrified, thereby preventing dry powder waste materials from being bonded on the inner wall of the spray dryer 3
When the embodiment is used specifically, the method comprises the following steps:
the method comprises the following steps: the wastewater enters the pretreatment tank 2 through the first wastewater conveying pipe 6 and the centrifugal water pump 9, and the alkaline neutralizer is put into the pretreatment tank 2, so that hydroxide precipitates can be generated from heavy metal ions in the wastewater;
step two: the pretreated waste water enters the spray dryer 3 through the centrifugal water pump 9 with two waste water conveying pipe holes, and the waste water is sprayed out from the atomizing nozzle 706 to directly contact with hot air in the spray dryer 3 for heat exchange to form dry powder waste;
step three: the dry powder waste falls into the bottom of the spray dryer 3 under the self gravity, and the waste can be discharged from the dry material outlet 302 by opening the discharge valve 20;
step four: wet flue gas in the spray dryer 3 and suspended dry powder enter the dust removing device 4 through the first exhaust pipe 14;
step five: under the action of the filter screen 401, suspended dry powder is settled into the collection hopper 402 and discharged from the solid particle outlet 403; the wet flue gas is finally exhausted through a second exhaust pipe 15 and a chimney 16 under the action of the smoke exhaust fan 5.
In embodiment 1 and embodiment 2, the lower surface of the filter screen 401 is provided with the cleaning mechanism 8, the cleaning mechanism 8 comprises a cleaning blade 801, a rotating shaft 802 and a second driving motor 803, and the second driving motor 803 is electrified to drive the cleaning blade 801 to rotate, so that dust collected on the lower surface of the filter screen 401 can be cleaned, on one hand, the filtering efficiency of the filter screen 401 can be improved, and on the other hand, the filter holes can be prevented from being blocked by the dust
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A waste water treatment device of a limestone-gypsum wet flue gas desulfurization system comprises a desulfurization waste water tank (1), a pretreatment tank (2), a spray dryer (3), a dust removing device (4) and a smoke exhaust fan (5), and is characterized in that the desulfurization waste water tank (1) is communicated with the side wall of the pretreatment tank (2) through a first waste water conveying pipe (6), the outer wall of the pretreatment tank (2) is communicated with a spraying structure (7) arranged at the top of the spray dryer (3) through a second waste water conveying pipe (10), and centrifugal water pumps (9) are arranged on the first waste water conveying pipe (6) and the second waste water conveying pipe (10);
the spraying structure (7) comprises a connecting pipe (701), a spraying main pipe (702) and spraying branch pipes (703), a sealing bearing (704) is fixed on the inner wall of the connecting pipe (701), the inner ring of the sealing bearing (704) is fixed on the outer wall of the top end of the first wastewater conveying pipe (6), a gear ring (705) is fixed on the outer wall of the connecting pipe (701), a driving gear (11) is meshed with the outer wall of the gear ring (705), the driving gear (11) is driven by a first driving motor (12), the bottom end of the connecting pipe (701) is connected with the spraying main pipe (702), the bottom end of the spraying main pipe (702) is communicated with the two vertically crossed spraying branch pipes (703), and the lower pipe walls of the spraying branch pipes (703) are uniformly provided with a plurality of atomizing nozzles (706);
the spray dryer (3) is provided with a hot air inlet (301), a dry material outlet (302) and a wet flue gas outlet (303), one end of the hot air inlet (301) is sequentially communicated with an external heater (305) and an air filter (306) through an air inlet pipe (304), the other end of the hot air inlet (301) is communicated with a hot air distributor (307) in the spray dryer (3), and the wet flue gas outlet (303) is communicated with a dust removal device (4) through a wet flue gas conveying pipe (13);
a filter screen (401) is obliquely arranged in the dust removing device (4), a cleaning mechanism (8) is arranged on the lower surface of the filter screen (401), a material collecting hopper (402) is arranged at the bottom of the dust removing device (4), a solid particle outlet (403) is arranged at the bottom end of the material collecting hopper (402), and an exhaust port (404) is arranged at the right end of the dust removing device (4);
the exhaust port (404) is communicated with the smoke exhaust fan (5) through a first exhaust pipe (14), and the smoke exhaust fan (5) is communicated with a chimney (16) through a second exhaust pipe (15).
2. The waste water treatment device of the limestone-gypsum wet flue gas desulfurization system according to claim 1, wherein a pair of connecting rods (17) is fixed on the outer wall of the connecting pipe (701), a scraping blade (18) is fixed on the tail end of each connecting rod (17), and the scraping blade (18) is in contact with the inner wall of the spray dryer (3).
3. The waste water treatment device of the limestone-gypsum wet flue gas desulfurization system according to claim 2, wherein the connecting rod (17) and the scraping blade (18) are made of corrosion-resistant and wear-resistant materials.
4. The waste water treatment device of the limestone-gypsum wet flue gas desulfurization system according to claim 1, wherein the cleaning mechanism (8) comprises a cleaning blade (801), a rotating shaft (802) and a second driving motor (803), the second driving motor (803) is installed on the top of the dust removing device (4) through a blood fixing block, the rotating shaft (802) is arranged at the output end of the second driving motor (803), and the rotating shaft (802) passes through the filter screen (401) and is fixed with a plurality of the cleaning blades (801).
5. The waste water treatment device of the limestone-gypsum wet flue gas desulfurization system according to claim 4, wherein the cleaning blade (801) is serrated, and the cleaning blade (801) is arranged in parallel to and in contact with the lower surface of the filter screen (401).
6. The waste water treatment device of the limestone-gypsum wet flue gas desulfurization system according to claim 1, wherein an interception net (19) is provided at the connection of the desulfurization waste water pool (1) and the first waste water delivery pipe (6).
7. The apparatus for treating waste water of limestone-gypsum wet flue gas desulfurization system according to claim 1, wherein alkaline neutralizing agent NaOH or Ca (OH) is put into the pretreatment tank (2)2And heavy metal ions in the wastewater can generate hydroxide precipitates while the pH value is adjusted.
8. The waste water treatment device of the limestone-gypsum wet flue gas desulfurization system according to claim 1, wherein a support leg (308) is arranged at the bottom end of the spray dryer (3), a control box (309) is arranged on the outer wall of the spray dryer (3), and a control panel and an operating state display lamp are arranged inside the control box (309).
9. The waste water treatment device of the limestone-gypsum wet flue gas desulfurization system according to claim 1, wherein the outer wall of the dry material outlet (302) and the outer wall of the solid particle outlet (403) are provided with discharge valves (20).
10. The apparatus for treating waste water of limestone-gypsum wet flue gas desulfurization system according to any one of claims 1 to 9, wherein the treatment process comprises the steps of:
the method comprises the following steps: the wastewater enters the pretreatment tank (2) through the first wastewater conveying pipe (6) and the centrifugal water pump (9), and the alkaline neutralizer is put into the pretreatment tank (2) to precipitate heavy metal ions in the wastewater;
step two: the pretreated waste water enters the spray dryer (3) through a centrifugal water pump (9) with two waste water conveying pipe holes, and the waste water is sprayed out from an atomizing nozzle (706) to directly contact with hot air in the spray dryer (3) for heat exchange to form dry powder waste;
step three: the dry powder waste falls into the bottom of the spray dryer (3) under the self gravity, and the waste can be discharged from a dry material outlet (302) by opening a discharge valve (20);
step four: wet flue gas in the spray dryer (3) and suspended dry powder enter the dust removing device (4) together through the first exhaust pipe (14);
step five: under the action of the filter screen (401), suspended dry powder is settled into the collecting hopper (402) and is discharged from the solid particle outlet (403); the wet flue gas is finally discharged through a second exhaust pipe (15) and a chimney (16) under the action of a smoke exhaust fan (5).
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