CN111701286A - Sintering flue gas desulfurization waste water high efficiency separates clarification processing apparatus - Google Patents
Sintering flue gas desulfurization waste water high efficiency separates clarification processing apparatus Download PDFInfo
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- CN111701286A CN111701286A CN202010450358.XA CN202010450358A CN111701286A CN 111701286 A CN111701286 A CN 111701286A CN 202010450358 A CN202010450358 A CN 202010450358A CN 111701286 A CN111701286 A CN 111701286A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0087—Settling tanks provided with means for ensuring a special flow pattern, e.g. even inflow or outflow
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
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Abstract
The invention belongs to the technical field of treatment and cyclic utilization of sintering flue gas desulfurization wastewater, and relates to a high-efficiency separation and clarification treatment device for sintering flue gas desulfurization wastewater, which comprises an outer cylinder, a central cylinder and a lifting assembly, wherein the outer cylinder, the central cylinder and the lifting assembly are coaxially sleeved from outside to inside by taking a vertical direction as a central shaft; the waste water enters the lifting assembly, overflows from an overflow port of the lifting assembly, enters the central cylinder, flows through the central cylinder, enters a water distribution area of the outer cylinder, passes through the water distribution area, is filtered by the inclined tube filler, and overflows and is discharged from a water outlet of the outer cylinder; and settling the large-particle suspended matters to the bottom of the settling zone for removal. The treatment capacity is 3-5 times of that of a horizontal flow sedimentation tank and 2-3 times of that of an accelerated clarification tank, the application range is wide, the treatment effect is high, and the occupied area is small.
Description
Technical Field
The invention belongs to the technical field of treatment and recycling of sintering flue gas desulfurization wastewater, and particularly relates to a sintering flue gas desulfurization wastewater efficient separation and clarification treatment device and a sintering flue gas desulfurization wastewater pretreatment system.
Background
The application of the sintering flue gas wet desulphurization (limestone/gypsum method) technology is a main means for controlling the emission of sulfides in power plants and the steel industry, and is used for controlling sulfur dioxide (SO)2) Important route for emissions. In the sintering flue gas wet desulphurization (limestone/gypsum method), heavy metal elements, fluorine ions, chlorine ions and the like are enriched, in order to maintain the balance of substances in a slurry circulating system of a desulphurization device, prevent the concentration of soluble parts in the flue gas, namely the concentration of the chlorine ions and the concentration of the fluorine ions from exceeding specified values and ensure the quality of gypsum, a part of filtrate water is required to be discharged from the system to be used as desulphurization wastewater, and the wastewater mainly comes from a gypsum dehydration and cleaning system, so that the corrosion to desulphurization equipment is reduced on one hand, and the influence on the quality of the gypsum is reduced on the other hand. In order to protect the environment, prevent and control pollution and promote the progress of wastewater technology and pollution treatment technology, the wastewater discharge standards of power plants and the steel industry are continuously updated, and the effluent quality of the existing wastewater treatment system needs to meet the discharge standards of water pollutants for the steel industry (GB13456-2012) or reach the zero discharge standard of wastewater.
The wet limestone/lime-gypsum method desulfurization wastewater mainly comes from the underflow of a solid-liquid separation tank of a gypsum cyclone station and a vacuum belt dehydrator, the temperature of the wastewater is 20-60 ℃, the pH value is 4-6, the solid content is 60000--20000-4 2-3700 and 5000mg/l of SO3 2-0-200 mg/l, ammonia nitrogen of 500-700mg/l, COD of 1200-1500mg/l, and the wastewater quality is characterized as follows: the wastewater is weakly acidic, and the PH is generally 4.0-6.0; the content of suspended matters is high, and the suspended matters in the wastewater are mainly gypsum particles, silicon dioxide and hydroxides of iron and aluminum; containing ammonia nitrogen; the content of inorganic salt is high, such as sulfate, chloride and the like;the COD value in the wastewater is higher.
The pretreatment of the desulfurization waste water is mainly to separate heavy metals and other precipitable substances such as fluoride, sulfite and sulfate by chemical and mechanical methods. In order to ensure that the quality of the effluent reaches the standard, the general process flow of the desulfurization wastewater adopts neutralization, flocculation, coagulation aiding and filtration, flocculating agents of polyaluminium chloride and polyacrylamide are respectively added after neutralization, so that the crystallized and precipitated inorganic salt, heavy metal complex and fine alum floc of suspended matters are accumulated into larger particles, and faster sedimentation is conveniently obtained in a mechanical acceleration clarifier. The clarifier is especially important in the waste water treatment process, and improving the separation effect of clarifier is an important means that waste water treatment equipment promoted the water purification effect. The traditional clarifier is mainly provided with a flow guide device, the ascending flow velocity is reduced, and the retention time is prolonged, but the traditional clarifier has the defects of overlarge volume of the clarifier, poor filtering effect, higher failure rate, high overall cost of wastewater treatment equipment and the like.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a high-efficiency separation and clarification treatment device for sintering flue gas desulfurization wastewater, which can solve at least one technical defect.
The basic concept of the technical scheme adopted by the invention is as follows:
a high-efficiency separation and clarification treatment device for sintering flue gas desulfurization wastewater comprises an outer cylinder, a central cylinder and a lifting assembly, wherein the outer cylinder, the central cylinder and the lifting assembly are coaxially sleeved from outside to inside by taking a vertical direction as a central axis;
the outer cylinder is provided with a water inlet and a water outlet, the water inlet is positioned at the lower part of the outer cylinder and is communicated with the interior of the lifting assembly through a water inlet pipe, and the water outlet is positioned at the upper part of the outer cylinder;
the lower end of the central cylinder is open, and the lower end opening of the central cylinder enables the interior of the central cylinder to be communicated with the interior of the outer cylinder;
the side surface of the upper part of the lifting component is provided with an overflow port, the lower end of the lifting component is provided with an opening, the lower end wall of the lifting component is abutted or separated with the inner wall of the outer cylinder body by controlling the lifting component, and the interior of the outer cylinder body is divided into a water distribution area and a sedimentation area with controllable on-off;
the settling zone is located below the lower end opening of the lifting assembly.
As an implementation mode, the top of outer barrel is equipped with electronic lifting valve group, electronic lifting valve group's output with the upper end of lifting unit is connected, in order to drive lifting unit reciprocates along vertical direction.
As an implementation manner, the settling area is provided with a sludge discharge port and an outer discharge valve, the electric lifting valve group is in linkage with the outer discharge valve, the outer discharge valve is opened, and the electric lifting valve group drives the lifting assembly to move upwards so as to communicate the water distribution area with the settling area.
In one embodiment, a flow guiding element is arranged above the outlet of the water inlet pipe and used for slowing down the water flow speed from the water inlet pipe, and the flow guiding element is a conical reflecting plate.
As an embodiment, the water distribution area is provided with an inclined tube filler in the area between the water outlet of the outer cylinder and the lower end of the central cylinder;
and a circle of triangular weir is arranged on the inner wall of the outer cylinder above the water outlet end of the inclined tube filler, and liquid flowing out of the water outlet of the inclined tube filler passes through the triangular weir and is discharged from the water outlet of the outer cylinder.
As an embodiment, the outer cylinder comprises an upper cylinder section and a lower inverted cylinder section, and an included angle α formed at a connection position of the cylinder section and the inverted cylinder section is 135 °.
In one embodiment, the central cylinder is a cylinder, and the lower end of the cylinder of the central cylinder is flush with the lower end of the cylinder segment of the outer cylinder;
the lifting assembly comprises a cylindrical structure and a bell mouth-shaped structure opening extending from the lower end of the cylindrical structure in a downward inclined mode.
In one embodiment, the volume of the settling zone and the lifting assembly accounts for 1/5 of the total volume of the separation and clarification treatment device.
In one embodiment, the inclined tube filler is formed by welding a plurality of hexagonal honeycomb tubes with hexagonal cross sections, the hexagonal honeycomb tubes are made of ethylene propylene copolymer, the length of each tube is 1m, the diameter of an inscribed circle is phi 30mm, and the inclination angle is 60 ℃.
The invention also relates to a sintering flue gas desulfurization wastewater pretreatment system which comprises the separation and clarification treatment device.
The technical scheme provided by the invention has the following beneficial effects:
1. the treatment capacity of the sintering flue gas desulfurization wastewater high-efficiency separation and clarification treatment device is 2-5 times that of a horizontal flow sedimentation tank or an accelerated clarification tank, and the overall cost of wastewater treatment equipment is reduced while the volume is reduced and the occupied area is saved. The residence time of the separation and clarification treatment device is 1.2-1.3 times of that of a horizontal flow sedimentation tank or an accelerated clarification tank, so that the removal efficiency of the sediment is ensured, and the removal rate of the sediment can be controlled between 90% and 95%.
2. The separation and clarification treatment device has the advantages of simple structure, flexible and efficient operation and difficult abrasion of parts.
3. The separation and clarification treatment device is not easy to block, the installation of the traditional high-efficiency clarifier mud scraper is reduced, and the maintenance failure rate is low.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
Wherein:
FIG. 1 is a schematic view of the structure of a separation and clarification treatment device according to the present invention;
FIG. 2 is a top view of the separation and clarification treatment apparatus shown in FIG. 1;
fig. 3 is a schematic view of the structure of an overflow port in the separation and clarification treatment apparatus of fig. 1.
The labels in the figure are: 1. an electric lifting valve group; 2. a lifting assembly; 3. an overflow port; 4. a water outlet; 5. a triangular weir; 6. a water distribution area; 7. a water inlet pipe; 8. a water inlet; 9. a central cylinder; 10. an outer cylinder; 11. a conical reflective plate; 12. a settling zone; 13. a sludge discharge port; 14. an outer discharge valve; 15. and (5) filling the inclined tube.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
As shown in fig. 1 to 3, according to an embodiment of the present invention, there is provided an efficient separation and clarification treatment device for sintering flue gas desulfurization wastewater, the separation and clarification treatment device includes an outer cylinder 10, a central cylinder 9 and a lifting assembly 2, which are coaxially sleeved from outside to inside with a vertical direction as a central axis; the space between the outer cylinder 10 and the central cylinder 9 and the other spaces in the outer cylinder 10 are hereinafter collectively referred to as the inside of the outer cylinder 10; the space between the central cylinder 9 and the lifting assembly 2 is hereinafter collectively referred to as the interior of the central cylinder 9.
The outer cylinder 10 is provided with a water inlet 8 and a water outlet 4, the water inlet 8 is positioned below the lower end of the central cylinder 9 and is communicated with the interior of the lifting assembly 2 through a water inlet pipe 7, and the water outlet 4 is positioned at a position close to the top of the outer cylinder 10;
the lower end of the central cylinder 9 is open and is communicated with the inside of an outer cylinder 10 positioned outside the central cylinder 9 through the opening;
the side surface of the lifting component 2 close to the top of the lifting component is provided with an overflow port 3, the lower end of the lifting component 2 is open, the lower end wall of the lifting component 2 is abutted or separated with the inner wall of the outer barrel 10 by controlling the lifting component 2, and the interior of the outer barrel 10 is divided into a water distribution area 6 and a sedimentation area 12 which can be controlled to be switched on and off;
the settling zone 12 is positioned below the lower end opening of the lifting assembly 2 and is provided with a sludge discharge port 13 and an outer discharge valve 14; the water distribution area 6 is provided with an inclined tube filler 15 in the area between the water outlet 4 of the outer cylinder 10 and the lower end of the central cylinder 9.
The liquid (waste water) to be treated enters the high-efficiency separation and clarification treatment device through the water inlet 8 of the outer cylinder 10 by pumping or overflowing by virtue of a height difference (the liquid level of the front-stage process is higher than that of the high-efficiency separation and clarification treatment device).
The processing capacity of the separation and clarification processing device is 2-5 times of that of a horizontal flow sedimentation tank or an accelerated clarification tank, so that the occupied area is saved, the volume of a clarifier is reduced, and the equipment cost is reduced. The retention time is 1.2-1.3 times of that of a horizontal flow sedimentation tank or an accelerated clarification tank, the removal efficiency of the sediment is ensured, and the removal rate of the sediment can be controlled between 90% and 95%. In addition, the device has the advantages of simple structure, flexible and efficient operation, difficult abrasion of parts and low maintenance failure rate.
The waste water that flows from the lower extreme opening of central barrel 9 gets into water distribution area 6, and the velocity of flow reduces, and dwell time increases, and 6 upper portions in water distribution area set up the pipe chute filler 15 simultaneously, and waste water rises and flows through the surface that the pipe chute filler 15, reduces the settling distance on the one hand, and on the other hand increases the surface area of clarifier, promotes the attachment point of precipitate, shortens the settling time, guarantees out water quality suspended solid concentration. In addition, the inclined tube packing 15 is convenient and simple to replace.
The upper end of the central cylinder 9 extends to the upper end cover of the outer cylinder 10 and can be connected with the upper end cover of the outer cylinder 10 in a welding mode.
As an embodiment, the top of outer barrel 10 is equipped with electronic lifting valve group 1, and the output of electronic lifting valve group 1 is connected with lifting unit 2's upper end to drive lifting unit 2 and reciprocate along vertical direction, thereby reciprocate through control lifting unit 2, realize the wall and the intercommunication of water distribution district 6 and settlement zone 12.
As an embodiment, the electric valve lifting group 1 is linked with the outer discharge valve 14, the outer discharge valve 14 is opened, and the electric valve lifting group 1 drives the lifting assembly 2 to move upwards.
The arrangement facilitates the regular discharge of the sediment at the bottom of the water distribution area 6 and the sediment in the settling area 12 through the discharge valve 14, the structure arrangement is exquisite, auxiliary elements are saved, the whole structure of the device is more compact, and the occupied area is reduced.
In one embodiment, a flow guiding element is arranged above the outlet of the water inlet pipe 7, and the flow guiding element is a conical reflecting plate 11.
Waste water gets into separation clarification processing apparatus's mode generally has two kinds, one kind is that the pump squeezes into, one kind is the entering of flowing automatically, if the mode that the pump squeezed into, because the lift pressure is too big, can arouse the violent stirring of the exit waste water of inlet tube 7, and then influences the precipitation effect of waste water, and the toper reflecting plate can play fine cushioning effect, and then can adapt to two kinds of entering methods of waste water simultaneously, guarantees the precipitation effect.
Specifically, the conical reflection plate 11 is a cone (or umbrella shape) with a hollow interior, the vertex of the cone is arranged upward, the inner surface of the cone faces the outlet of the water inlet pipe 7, and water flowing out of the water inlet pipe 7 first contacts the inner surface of the cone, so that the water flow speed is buffered.
As an implementation mode, the water distribution area 6 is provided with an inclined tube filler 15 in the area between the water outlet 4 of the outer cylinder 10 and the lower end of the central cylinder 9; the inner wall of the outer cylinder body 10 above the water outlet end of the inclined tube filler 15 is provided with a circumferential triangular weir 5, and liquid flowing out of the water outlet end of the inclined tube filler 15 passes through the triangular weir 5 and then is discharged from the water outlet 4 of the outer cylinder body 10.
Specifically, the water outlet 4 is a small hole formed in the outer cylinder 10, and discharges the liquid through a connecting pipe.
The triangular weir 5 can prevent large suspended matters from overflowing and entering the next process section.
As an embodiment, the outer cylinder 10 comprises an upper cylinder section and a lower cone section, and the connection between the cylinder section and the inverted cone section forms an included angle α of 135 °.
The angle setting can guarantee that the precipitate sinks smoothly, equipment is not easy to block, necessary mud scrapers in the traditional high-efficiency clarifier are reduced, and then the failure rate of the equipment is reduced.
As an embodiment, the central cylinder 9 is a cylinder, and the lower end opening of the cylinder of the central cylinder 9 is flush with the lower end of the cylinder segment of the outer cylinder 10;
the lifting assembly 2 comprises a cylindrical structure and an opening of a bell-mouth-shaped structure extending from the lower end of the cylindrical structure in a downward inclined manner, and the lower end of the bell-mouth-shaped structure is abutted to the inner wall of the inverted cone section of the outer cylinder 10.
The structure setting of above-mentioned lifting unit 2 and outer barrel 10, it realizes cutting apart and the intercommunication of water distribution district, settlement zone 12 to be convenient for it, reduces auxiliary structure's setting, but also more is favorable to subsiding and the discharge of precipitate. In the state that the settling zone is separated from the water distribution zone, the area enclosed by the horn-shaped opening extending from the lower end of the cylindrical structure of the lifting component 2 and the inverted cone-shaped wall of the outer cylinder 10 below the opening is the settling zone; the water distribution area is an area defined by the outer wall of the trumpet-shaped opening, the outer wall of the central cylinder 9 and the inner wall of the outer cylinder 10 positioned above the outer wall of the trumpet-shaped opening and is a water distribution area 6.
In one embodiment, the volume of the settling zone 12 and the lift module 2 is 1/5 of the total volume of the separation and clarification treatment device.
The wastewater enters the settling zone 12 and the lifting component 2 from the water inlet pipe 7, and 40-50% of large-particle suspended matters in the wastewater can settle to the bottom of the settling zone 12 for removal.
In one embodiment, the inclined tube filler is formed by welding a plurality of hexagonal honeycomb tubes with hexagonal cross sections, the hexagonal honeycomb tubes are made of ethylene propylene copolymer, the length of each tube is 1m, the diameter of an inscribed circle is phi 30mm, and the inclination angle is 60 ℃.
The inclined tube filler 15 with the specification has the advantages of large wet circumference, small hydraulic radius, good laminar flow state, no disturbance of turbulent flow on particle sedimentation and optimal effluent quality.
The work flow of the separation and clarification treatment device is roughly as follows:
the wastewater enters the separation and clarification treatment device from a water inlet pipe 7 arranged at a water inlet 8, the wastewater flowing out from an outlet of the water inlet pipe 7 is guided by a conical reflecting plate 11 and then enters a lifting assembly 2, the wastewater flows through the lifting assembly 2 and then overflows from an overflow port 3 of the lifting assembly 2 and enters a central barrel 9, the wastewater flows through the central barrel 9 and then enters a water distribution area 6 of an outer barrel 10 from a lower end opening of the central barrel 9, and the wastewater is filtered by an inclined tube filler 15 after passing through the water distribution area 6 and then overflows from a triangular weir 5 at the edge of the outer barrel 10 and then is discharged from a water outlet 4 and then enters the next process section for subsequent treatment.
40-50% of large-particle suspended matters in the wastewater can be settled to the bottom of the settling zone 12 for removal;
the separating and clarifying treatment device is used for periodically opening the external discharge valve 14 to discharge sediments, the electric lifting valve group 1 is opened when the external discharge valve 14 is opened, the electric lifting valve group 1 lifts the lifting assembly 2 by 5-10cm so as to communicate the water distribution area 6 with the settling area 12, the sediments at the bottom of the water distribution area 6 sink to the settling area 12 through a gap at the junction of the lifting assembly 2 and the water distribution area 6, and are discharged together with the sediments in the settling area 12 through the external discharge valve 14.
The invention also relates to a sintering flue gas desulfurization wastewater pretreatment system which comprises the separation and clarification treatment device.
The above description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention is intended to be covered by the appended claims.
Claims (10)
1. The efficient separation and clarification treatment device for the sintering flue gas desulfurization wastewater is characterized by comprising an outer cylinder, a central cylinder and a lifting assembly, wherein the outer cylinder, the central cylinder and the lifting assembly are coaxially sleeved from outside to inside by taking a vertical direction as a central axis;
the outer cylinder is provided with a water inlet and a water outlet, the water inlet is positioned at the lower part of the outer cylinder and is communicated with the interior of the lifting assembly through a water inlet pipe, and the water outlet is positioned at the upper part of the outer cylinder;
the lower end of the central cylinder is open, and the lower end opening of the central cylinder enables the interior of the central cylinder to be communicated with the interior of the outer cylinder;
the side surface of the upper part of the lifting component is provided with an overflow port, the lower end of the lifting component is provided with an opening, the lower end wall of the lifting component is abutted or separated with the inner wall of the outer cylinder body by controlling the lifting component, and the interior of the outer cylinder body is divided into a water distribution area and a sedimentation area with controllable on-off;
the settling zone is located below the lower end opening of the lifting assembly.
2. The separation and clarification treatment device according to claim 1, wherein an electric lifting valve set is arranged at the top of the outer cylinder, and the output end of the electric lifting valve set is connected with the upper end of the lifting assembly so as to drive the lifting assembly to move up and down along the vertical direction.
3. The separation and clarification treatment device according to claim 2, wherein the settling zone is provided with a sludge discharge port and an outer discharge valve, the electric lifting valve group is arranged in a linkage manner with the outer discharge valve, the outer discharge valve is opened, and the electric lifting valve group drives the lifting assembly to move upwards to communicate the water distribution zone with the settling zone.
4. The apparatus according to claim 1, wherein a flow guide element is provided above the outlet of the inlet pipe for slowing the velocity of the water flowing from the inlet pipe, the flow guide element being a conical reflecting plate.
5. The separation and clarification treatment device according to claim 1, wherein the water distribution area is provided with an inclined tube filler in the area between the water outlet of the outer cylinder and the lower end of the central cylinder;
and a circle of triangular weir is arranged on the inner wall of the outer cylinder above the water outlet end of the inclined tube filler, and liquid flowing out of the water outlet of the inclined tube filler passes through the triangular weir and is discharged from the water outlet of the outer cylinder.
6. The apparatus according to claim 1, wherein the outer cylinder comprises an upper cylinder section and a lower inverted cylinder section, and the cylinder section and the inverted cylinder section are connected to form an included angle α of 135 °.
7. The apparatus according to claim 6, wherein the central cylinder is a cylinder, and the lower end of the cylinder of the central cylinder is flush with the lower end of the cylinder segment of the outer cylinder;
the lifting assembly comprises a cylindrical structure and a bell mouth-shaped structure opening extending from the lower end of the cylindrical structure in a downward inclined mode.
8. The separation and clarification treatment device according to claim 1, wherein the volume of the settling zone and the lifting assembly accounts for 1/5 of the total volume of the separation and clarification treatment device.
9. The separation and clarification treatment device according to claim 5, wherein the inclined tube filler is formed by welding a plurality of hexagonal honeycomb tubes with hexagonal cross sections, the hexagonal honeycomb tubes are made of ethylene propylene copolymer, the length of each tube is 1m, the diameter of an inscribed circle is phi 30mm, and the inclination angle is 60 ℃.
10. A pretreatment system for flue gas desulfurization wastewater from sintering, comprising the separation and clarification treatment device according to any one of claims 1 to 9.
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| CN202010450358.XA CN111701286B (en) | 2020-05-25 | 2020-05-25 | High-efficient separation clarification processing apparatus of sintering flue gas desulfurization waste water |
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| CN202010450358.XA CN111701286B (en) | 2020-05-25 | 2020-05-25 | High-efficient separation clarification processing apparatus of sintering flue gas desulfurization waste water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115608135A (en) * | 2022-10-08 | 2023-01-17 | 湖北泰盛化工有限公司 | Self-consistent type resource treatment method for salt-containing wastewater and hydrochloric acid-containing waste gas |
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| CN111701286B (en) | 2023-09-26 |
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