CN108176085B - High-efficiency clarifier for green liquor - Google Patents
High-efficiency clarifier for green liquor Download PDFInfo
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- CN108176085B CN108176085B CN201711241334.8A CN201711241334A CN108176085B CN 108176085 B CN108176085 B CN 108176085B CN 201711241334 A CN201711241334 A CN 201711241334A CN 108176085 B CN108176085 B CN 108176085B
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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
- B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
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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
- B01D21/04—Settling tanks with single outlets for the separated liquid with moving scrapers
- B01D21/06—Settling tanks with single outlets for the separated liquid with moving scrapers with rotating scrapers
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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
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2405—Feed mechanisms for settling tanks
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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
- B01D21/28—Mechanical auxiliary equipment for acceleration of sedimentation, e.g. by vibrators or the like
- B01D21/286—Means for gentle agitation for enhancing flocculation
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Abstract
The invention discloses a green liquor high-efficiency clarifier which comprises a stirring device. The green liquor high-efficiency clarifier provided by the invention can greatly improve the productivity of equipment and realize energy conservation and consumption reduction; compared with the traditional green liquor clarifier with the same specification, the equipment has high sedimentation efficiency, low energy consumption and novel structure; the sedimentation speed is improved, and the productivity of the equipment is further improved; the device does not need to add mixing equipment, has compact structure, small occupied area, small specification, less materials and low cost; the liquid is distributed in a rotating mode, the sectional area of the cylinder body is fully utilized, and the capacity of equipment is improved; the liquid distribution pipe can be automatically cleaned regularly; the operation and maintenance are convenient, the service life of spare parts is long, and the operation is safe and reliable; the mud scraping rake and the stirring speed are adjustable, and the application range is wide; ensuring that the green cleaning liquid on the surface layer cylinder section is relatively synchronously and uniformly collected to an outlet, so that the obtained green cleaning liquid has low solid content; the cost performance is high.
Description
Technical Field
The invention relates to sedimentation equipment, in particular to a green liquor high-efficiency clarifier, and belongs to the technical field of clarifiers.
Background
At present, the full utilization of resources, the reduction of energy consumption and the environmental protection become the subjects of continuous attention required by various industries and continuous research of new ideas and new measures; the pollution is particularly prominent in the paper making industry, and the green sustainable development of the industry is realized by researching and developing new products, improving equipment, adopting new processes and the like, which is the direction of equipment manufacturers at present.
For many years, the treatment of the green liquor in the causticized alkali recovery section of the papermaking industry has been carried out by adopting the traditional natural settling equipment, namely a clarifier and equipment for filtering through a mesh bag, namely an X filter. The clarifier is different according to different production capacities of specifications, the sectional area () of the cylinder and the sedimentation speed of the original green liquor determine the size of the production capacity, the sedimentation speed of the original green liquor is the inherent characteristic of the solution, the characteristic can not be changed in a natural state, the production capacity of the equipment is mainly influenced by the sectional area of the cylinder for the sedimentation equipment, and because the original green liquor is firstly introduced into the middle stock well, the diameter of the stock well usually accounts for 1/9 of the diameter of the cylinder, the original green liquor can only be dispersed from the stock well to the peripheral sedimentation sides, the solid matter of the original green liquor reaches the edge of the cylinder rarely, and the utilization rate of the section of the cylinder is low.
In summary, the conventional green liquor clarifier has the following disadvantages: firstly, former green liquor sedimentation rate is low, secondly, barrel diameter cross-section low-usage receives the influence of these two aspects, and often equipment specification is very big, leads to area big, and then makes expenses such as equipment foundation, equipment material, installation high.
And for the X filter, the operation needs the powerful pump of configuration, and the power consumption is high, and the filter screen needs regularly to be changed, and is expensive to the operation is loaded down with trivial details relatively: the internal pressure of the equipment is high, if one net bag is damaged, suspended matters of the green liquor are directly raised, the machine has to be stopped to check and replace the damaged net bag, all fan blades sleeved with the net bag are required to be checked one by one after the damaged net bag is checked under the limitation of the structure, the operation is complex, and the production is seriously influenced.
For paper mills, the most important are stable and reliable equipment, stable indexes, convenient operation, high productivity and low energy consumption, and the high-efficiency clarifier for green liquor can meet the requirements.
Disclosure of Invention
Aiming at the defects, the invention provides the high-efficiency clarifier for the green liquor, which can greatly improve the productivity of equipment and realize energy conservation and consumption reduction; compared with the traditional green liquor clarifier with the same specification, the equipment has high sedimentation efficiency, low energy consumption and novel structure; the sedimentation speed is improved, and the productivity of the equipment is further improved; the device does not need to add mixing equipment, has compact structure, small occupied area, small specification, less materials and low cost; the liquid is distributed in a rotating mode, the sectional area of the cylinder body is fully utilized, and the capacity of equipment is improved; the liquid distribution pipe can be automatically cleaned regularly; the operation and maintenance are convenient, the service life of spare parts is long, and the operation is safe and reliable; the mud scraping rake and the stirring speed are adjustable, and the application range is wide; ensuring that the green cleaning liquid on the surface layer cylinder section is relatively synchronously and uniformly collected to an outlet, so that the obtained green cleaning liquid has low solid content; the cost performance is high.
In order to solve the technical problems, the invention adopts the following technical scheme: the high-efficiency clarifier for green liquor comprises a stirring device.
According to an optimized scheme, the stirring device comprises a mixing chamber and a mixing chamber stirrer, wherein the mixing chamber comprises an upper mixing chamber, a plurality of flocculating agent inlets are formed in the upper mixing chamber, and the flocculating agent inlets are connected with a flocculating agent liquid inlet pipe; and a mixing chamber stirrer is arranged on the central axis of the mixing chamber.
Further, agitating unit includes the mixing chamber, the mixing chamber includes mixing chamber down, the mixing chamber is connected with many liquid distribution pipes down, the liquid distribution pipe includes the liquid distribution pipe way, and the liquid distribution pipe way reduces to the one end pipe diameter of keeping away from the mixing chamber along the one end that is close to the mixing chamber gradually, and the liquid distribution pipe way is concentric reducing structure.
Further, agitating unit includes mixing chamber, mixing chamber agitator, the mixing chamber includes the upper mixing chamber, the bottom of upper mixing chamber is provided with back flush mouth of a river.
Further, the overflow weir comprises a middle overflow weir, a diversion trench and an edge overflow weir;
the middle overflow weir is of an octagonal structure, and the cross section of the middle overflow weir is U-shaped;
the cross section of the diversion trench is U-shaped, and two ends of the diversion trench are respectively connected with the middle overflow weir and the edge overflow weir;
the edge overflow weir and the equipment cylinder are welded into a whole, and the cross section of the edge overflow weir is a U-shaped cross section.
Further, the area within the octagonal interior region of the intermediate weir is 1/2 of the area of the octagonal exterior-to-edge weir region.
The device further comprises a driving device, wherein the driving device comprises an output shaft of the discharging rake speed reducer and an output shaft of the mixing chamber stirrer speed reducer, and the axes of the output shaft of the discharging rake speed reducer and the output shaft of the mixing chamber stirrer speed reducer are overlapped.
Furthermore, the upper part of an output shaft of the discharging rake speed reducer is connected with a discharging rake planetary speed reducer, the upper part of the discharging rake planetary speed reducer is connected with a discharging rake speed reducer, and the upper part of the discharging rake speed reducer is connected with a discharging rake driving motor;
the lower part of the output shaft of the discharging rake speed reducer is connected with a discharging rake main shaft;
the upper part of the output shaft of the mixing chamber stirrer speed reducer is connected with a mixing chamber stirrer speed reducer, and the upper part of the mixing chamber stirrer speed reducer is connected with a mixing chamber stirrer motor;
the lower part of the output shaft of the speed reducer of the mixing chamber stirrer is connected with the mixing chamber stirrer.
Furthermore, the stirring device comprises a mixing chamber, the mixing chamber comprises a discharge rake, the upper part of the discharge rake is connected with a discharge rake main shaft, the discharge rake comprises a rake arm and rake teeth, the rake arm is provided with a plurality of rake teeth, and the rake teeth are arranged along the conical bottom wall of the equipment cylinder.
Further, the stirring device comprises a mixing chamber, the mixing chamber comprises an upper mixing chamber and a lower mixing chamber, and the upper mixing chamber and the lower mixing chamber are sealed through ethylene propylene diene monomer gaskets;
the mixing chamber cylinder diameter of the upper mixing chamber is about 1/2 times the diameter of the device cylinder.
According to the invention, 6 liquid distribution pipes form an angle of 60 degrees with each other through the rotary liquid distribution pipe, the original green liquid can be relatively uniformly distributed on the whole cylinder section in the rotating process, and solid matters in the original green liquid can be more quickly settled.
The invention adds the flocculating agent into the original green liquor to improve the sedimentation speed of suspended matters in the original green liquor, and the sedimentation speed can reach about 1.75 m/h.
According to the structure of the middle overflow weir and the edge overflow weir, the green cleaning liquid in the middle of the liquid level can be collected to the edge overflow weir more quickly through the middle overflow weir, and the green cleaning liquid below the liquid level can rise more quickly.
The structure of the discharging harrow and the liquid distribution pipe which synchronously rotate runs at a low rotating speed of 0.07r/min, prevents the rotating part from disturbing liquid in the rotating process, and realizes that green mud deposited at the bottom layer is collected to a mud pit in the middle and is further pumped away.
The invention is used for the mixing chamber for mixing the flocculating agent and the original green liquor, the mode of adding the flocculating agent at multiple points is adopted in the mixing chamber, and the stirrer is additionally arranged in the mixing chamber, so that the flocculating agent and the original green liquor are fully mixed, the combination of solid matters in the original green liquor and the flocculating agent is facilitated, and the clarification effect is further improved.
After the technical scheme is adopted, compared with the prior art, the invention has the following advantages:
compared with the traditional green liquor clarifier with the same specification, the equipment has the advantages of high sedimentation efficiency, small occupied area, low energy consumption and novel structure, and belongs to a domestic pioneer product.
1. The sedimentation speed is increased by adding the flocculating agent into the mixing chamber with the novel structure, and the sedimentation speed can reach 1.75m/h, so that the productivity of equipment is improved.
2. Adopt concentric syntropy biax output speed reducer, adopt the structure of the interior mixing chamber of barrel mixed former green liquor and flocculating agent, need not to increase mixing apparatus, compact structure saves the cost.
3. By adopting a novel liquid distribution pipe structure and rotating liquid distribution, the sectional area of the cylinder body is fully utilized, and the capacity of equipment is improved.
4. Compared with the traditional clarifier, the structure is compact, the occupied area is small, the specification is small, the material consumption is less, and the cost is low.
5. The equipment is provided with a backflow pipeline to prevent the liquid inlet pipe from being blocked, and the internal liquid distribution pipe is provided with a back flushing water pipe to automatically clean the liquid distribution pipe at regular intervals.
6. Convenient operation and maintenance, long service life of spare parts and safe and reliable operation.
7. The mud scraping rake and the stirring speed are adjustable, the application range is wide, the rotating speed can be properly adjusted according to the suspended matter content of the green liquor after the solid content of the original green liquor is changed, and the speed adjusting range is 0.07-0.12 r/min.
8. The matched flocculant preparation system has the advantages that the addition amount of the flocculant can be adjusted according to the solid content of the original green liquor and the amount of the green liquor to be treated, and the adjustable range is wide.
9. The structure that the middle overflow weir and the edge overflow weir synchronously overflow to discharge liquid is adopted, the disturbance of the upper layer green liquor on the settling velocity of the lower layer micro solid matters is reduced, the green liquor on the section of the surface layer cylinder is relatively synchronously and uniformly collected to an outlet, the solid content of the obtained green liquor is low, and the solid content can reach 30 ppm.
The advantages that are finally presented are: the capacity of the high-efficiency green liquor clarifier is 4.8 times of that of a common clarifier with the same specification, and the cost performance of the high-efficiency green liquor clarifier selected under the condition of specific capacity is high.
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic diagram of a green liquor high efficiency clarifier;
FIG. 2 is a schematic view of the structure of the driving device;
FIG. 3 is a schematic view of the structure of the stirring apparatus;
FIG. 4 is a partial cross-sectional view of the stirring device;
FIG. 5 is a schematic view of the upper mixing chamber configuration;
FIG. 6 is a schematic view of the lower mixing chamber configuration;
FIG. 7 is a schematic view of the configuration of the liquid distribution tube;
FIG. 8 is a schematic view of a discharge rake structure;
FIG. 9 is a schematic view of the construction of a weir;
1-transmission support, 2-driving device, 3-stirring device, 4-overflow weir, 5-equipment barrel, 21-discharge rake driving motor, 22-discharge rake speed reducer, 23-discharge rake planetary speed reducer, 24-discharge rake speed reducer output shaft, 25-mixing chamber stirrer motor, 26-mixing chamber stirrer speed reducer, 27-mixing chamber stirrer speed reducer output shaft, 3-stirring device, 31-mixing chamber stirrer, 32-discharge rake main shaft, 33-mixing chamber, 34-liquid distribution pipe, 35-discharge rake, 4-overflow weir, 41-intermediate overflow weir, 42-diversion trench, and 43-edge overflow weir.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
EXAMPLE 1 high efficiency clarifier for Green liquor
As shown in figures 1-9, the invention provides a green liquor high-efficiency clarifier, which comprises a transmission bracket 1, a driving device 2, a stirring device 3, an overflow weir 4 and an equipment cylinder 5,
the driving device 2 comprises a discharge rake driving motor 21, a discharge rake speed reducer 22, a discharge rake planetary speed reducer 23, a discharge rake speed reducer output shaft 24, a mixing chamber stirrer motor 25, a mixing chamber stirrer speed reducer 26 and a mixing chamber stirrer speed reducer output shaft 27;
the stirring device 3 comprises a mixing chamber stirrer 31, a discharge rake main shaft 32, a mixing chamber 33, a liquid distribution pipe 34 and a discharge rake 35;
the overflow weir 4 comprises a middle overflow weir 41, a diversion trench 42 and an edge overflow weir 43;
the bottom wall of the equipment cylinder 5 is of a conical structure.
The transmission bracket 1: mainly comprises H-shaped steel, and is welded on the equipment cylinder 5 for supporting the driving device 2, the stirring device 3 and the middle overflow weir 41.
The driving device 2: the driving device 2 is a combined speed reducer, realizes the concentric and independent driving of the output shaft 27 of the speed reducer of the mixing chamber stirrer and the output shaft 24 of the speed reducer of the discharging rake, and is arranged on the transmission bracket 1, and the two output shafts at the bottom are respectively connected with the discharging rake 35 and the mixing chamber stirrer 31 in the stirring device.
The stirring device 3: the stirring device 3 realizes the mixing of the flocculating agent and the original green liquor, the rotary liquor distribution, the green mud collection to a mud pit at the bottom of the barrel body and the like.
And (4) overflow weir 4: the device consists of a steel plate with saw-toothed shapes and profile steel, and realizes the synchronous overflow of the green cleaning liquid.
The discharge rake driving motor 21: finally used for driving the discharge harrow, and the bottom of the discharge harrow is connected with a discharge harrow speed reducer 22.
Discharge rake speed reducer 22: used for reducing the rotating speed of the discharge harrow driving motor 21, and the upper part of the discharge harrow driving motor is connected with the discharge harrow driving motor 21.
The equipment barrel 5: mainly consists of steel plates.
Unloading rake planetary reducer 23: the upper part of the discharge rake driving motor is connected with a discharge rake speed reducer 22, the lower part of the discharge rake driving motor is connected with an output shaft 24 of the discharge rake speed reducer, and the discharge rake driving motor is fixed on a mixing chamber stirrer speed reducer 26 through section steel.
Discharge rake reducer output shaft 24: the upper part of the transmission device is connected with the discharge rake planetary reducer 23, and the lower part of the transmission device is connected with the discharge rake main shaft 32.
Mixing chamber agitator motor 25: for driving the mixing chamber agitator 31, the bottom of which is connected to the mixing chamber agitator reducer 26.
Mixing chamber agitator speed reducer 26: used for reducing the rotating speed of a mixer stirrer motor 25, the bottom of which is arranged on the transmission bracket 1 and is connected with an output shaft 27 of a mixer speed reducer.
And a mixing chamber stirrer reducer output shaft 27 for transmitting the torque output by the mixing chamber stirrer reducer 26, the upper part of which is connected with the mixing chamber stirrer reducer 26 and the lower part of which is connected with the mixing chamber stirrer 31.
Mixing chamber agitator 31: used for mixing the flocculating agent and the original green liquor and consists of a steel pipe and bent angle steel, and the upper part of the steel pipe is connected with an output shaft 27 of a speed reducer of a mixer of a mixing chamber.
Discharge rake main shaft 32: is connected with the liquid distribution pipe 34 and the discharge harrow 35 into a whole, is driven by a discharge harrow planetary reducer 23 to rotate at a lower speed, mainly comprises a steel pipe and a flange, and the upper part of the discharge harrow planetary reducer is connected with an output shaft 24 of the discharge harrow reducer.
The mixing chamber 33: the green liquor and flocculating agent containing device is used for containing green liquor and flocculating agent, the green liquor and flocculating agent are fully mixed at the green liquor and flocculating agent containing device, the green liquor and flocculating agent containing device is mainly formed by welding steel plates, a mixing chamber is divided into two parts, namely an upper mixing chamber 331 and a lower mixing chamber 332, the upper mixing chamber 331 is fixed to the top cover of a device barrel body 5 through flat steel, the part cannot rotate, the lower mixing chamber 332 and a discharge rake main shaft 32 are welded into a whole, the lower mixing chamber 331 rotates along with the discharge rake main shaft 32, the upper mixing chamber 331 and the lower mixing chamber 332 are sealed through an ethylene propylene diene monomer gasket, and the mixed green liquor is prevented from.
Lower mixing chamber 332: consists of a steel plate, a steel pipe and a flange, is welded with the discharge rake main shaft 32 and rotates along with the discharge rake main shaft 32, and the mixed solution is introduced into the liquid distribution pipe 34.
Mixing chamber cylinder 333 of upper mixing chamber 331: consists of a steel plate and is used for isolating external settled green liquor, and a flocculating agent is mixed with the original green liquor; an Ethylene Propylene Diene Monomer (EPDM) gasket is arranged at the bottom of the mixing chamber cylinder 333 and is used for sealing the contact part of the mixing chamber cylinder 333 and the lower mixing chamber 332, and the diameter of the mixing chamber cylinder 333 is about 1/2 of the diameter of the equipment cylinder 5.
Flocculant inlet 334: the flocculant mixing device consists of a steel pipe and a flange, and is welded on a mixing chamber cylinder 333, and the flocculant enters a mixing chamber 33 from an inlet; there are 5 in total.
Back flushing water gap 335: the mixing chamber consists of a steel pipe and a flange, and is welded on a mixing chamber cylinder, and high-pressure water enters the mixing chamber from an inlet. And washing the liquid distribution pipe.
Liquid distribution pipe 34: the raw green liquor is conveyed into the equipment cylinder 5, mainly composed of a steel pipe and an elbow, connected with the lower mixing chamber 332 through a flange and rotates along with the main shaft 32 of the discharging rake. There are 6 liquid distribution pipes 34.
The liquid distribution pipe 34 comprises a liquid distribution pipe 341, and a plurality of liquid outlets 342 are arranged at the bottom of the liquid distribution pipe 341 in the length direction;
liquid distribution pipe 341: the liquid distribution pipe 341 is of a concentric diameter-variable structure, and the pipe diameter of the liquid distribution pipe 341 is gradually reduced from one end close to the mixing chamber 33 to the other end far away from the mixing chamber 33.
Liquid outlet 342: the green liquor dredging device comprises a steel pipe and an elbow, and is mainly used for dredging the original green liquor into the cylinder body.
The discharge rake 35: the square flange is connected with the discharge rake main shaft 32, rotates along with the discharge rake main shaft 32, collects settled green mud into a bottom mud pit, and mainly comprises bent channel steel, angle steel and steel pipes.
The discharge rake 35 includes a rake arm 351 and a rake tine 352.
The rake arm 351: is formed by bending a steel plate and mainly transmits the torque of the main shaft 32 of the discharging harrow.
Rake tines 352: the green mud collecting device consists of a steel pipe and a bent steel plate, is welded on a rake arm 351 and is mainly used for collecting settled green mud; the tines 352 are provided in plurality along the conical bottom wall of the apparatus barrel 5.
Intermediate overflow weir 41: for collecting clear green liquor in the middle of liquid level: the octagonal structure has a U-shaped section and is hung on the transmission bracket 1 by a pull rod.
The guide groove 42: the green cleaning liquid collected by the middle overflow weir 41 is dredged to the edge overflow weir 43; the cross section is U-shaped, and the two ends are respectively connected with the middle overflow weir 41 and the edge overflow weir 43.
Edge overflow weir 43: all the green liquor overflowing to the edge overflow weir 43 is collected at the liquor outlet of the equipment cylinder 5, and flows into the next treatment equipment from the liquor outlet: the edge overflow weir 43 is welded with the equipment cylinder 5 into a whole, and the section is a U-shaped section.
Description of the dimensional relationship: the area within the octagonal inner region of the intermediate weir 41 is 1/2 of the area of the octagonal outer-to-edge weir 43 region.
The flocculant solution with specific concentration is prepared by a flocculant preparation system, the raw green liquor enters the equipment barrel 5 and then is fully mixed with the flocculant solution in the mixing chamber 33, then the green liquor is uniformly distributed in the equipment barrel 5 through the liquor distribution pipe 34, solid matters in the raw green liquor are flocculated into solid particles under the action of the flocculant, the solid particles are settled under the action of gravity, the clear green liquor moves upwards, the settled solid particles are collected to a mud pit at the bottom of the equipment by the discharge rake 35 and are pumped away by a green mud pump, the clear green liquor uniformly overflows through the overflow weir 4 and is collected to an outlet to flow out, and therefore the purpose of solid-liquid separation is achieved.
Development and design of the mixing chamber:
the settling velocity of the original green liquor is about 0.36m/h, the settling velocity can be increased to about 1.75m/h by adding a flocculating agent with a large molecular chain, the flocculating agent and the original green liquor are fully mixed when the settling velocity is reached, solid matters are quickly coagulated after mixing, the mixed liquor is required to reach the equipment barrel 5 as soon as possible, air mixed with the original green liquor is prevented from entering a settling area, and a mixing chamber is researched and designed according to the limiting conditions. FIG. 5 is a schematic diagram of the structure of an upper mixing chamber, and FIG. 6 is a schematic diagram of the structure of a lower mixing chamber;
raw green liquor enters the mixing chamber 33, meanwhile, the flocculating agent enters the mixing chamber 33 through a plurality of inlets, and the raw green liquor and the flocculating agent are fully and uniformly mixed through a mixing chamber stirrer 31 (as shown in a partial sectional view of a stirring device in figure 4), the fully mixed liquor enters the liquid distribution pipe 34 through a communicating pipe of the lower mixing chamber 332 and the liquid distribution pipe 34, air mixed with the raw green liquor rises to the top inside the mixing chamber 33, the purpose of separating the air from the raw green liquor is achieved, and the influence of the air on solid settlement is avoided.
The research and development design of the liquid distribution pipe: FIG. 7 is a schematic view of a liquid distribution tube structure;
the total number of the liquid distribution pipes is 6, the liquid distribution pipes rotate at the rotating speed of 0.07-0.12r/min along with the main shaft 32 of the discharging rake, the raw green liquid added with the flocculating agent enters the liquid distribution pipe 34 after passing through the mixing chamber 33, in order to ensure the uniformity, a plurality of liquid outlets 342 are additionally arranged at the bottom of the length direction of the liquid distribution pipe 34, the raw green liquid reaches the equipment barrel 5 through the liquid outlets 342 and begins to settle, the structure ensures that the raw green liquid is relatively uniformly distributed in the area through which the liquid distribution pipe 34 rotates, and therefore the purposes of rotary liquid distribution and uniform settlement are achieved.
The development and design of the intermediate overflow weir: FIG. 9 is a schematic view of a weir arrangement;
before there is not middle weir, the clear green liquid in the middle of the liquid level region can only be collected away when flowing to the edge, compared with the situation that the clear green liquid in the region close to the edge weir 43 is collected away in unit time, the clear green liquid in the lower layer of the region with higher flow speed rises faster, the more solid matters are brought, thus the clear green liquid in the edge region of the equipment cylinder 5 is higher than the solid matters in the middle clear green liquid, and finally the solid matters in the clear green liquid obtained by the equipment are relatively high.
After overflow weir 41 in the middle of the design, guarantee that the clear green liquor in the middle of the equipment barrel 5 is collected away rapidly, the clear green liquor of lower floor rises more fast, and in addition, middle overflow weir 41 has guaranteed that the clear green liquor on 5 cross-sections of surface layer equipment barrel is synchronous relatively, even is collected the export, guarantees that the synchronous of clear green liquor rises on 5 diameter cross-sections of equipment barrel, reduces the clear green liquor solid content who finally obtains.
The concentric double-speed reducer is selected as follows: FIG. 2 is a schematic structural diagram of a driving device;
in order to realize the stirring and mixing of the original green liquor and the flocculating agent and the collection and pumping away of the settled green mud to a bottom mud pit, a concentric double-speed reducer is finally selected through research.
According to the solid content of the original green liquor in the causticization section, the solid content fluctuates and the solid content of the original green liquor in each large paper mill is different, in order to make the equipment have stronger adaptability, the discharge rake driving motor 21 and the mixing chamber stirrer motor 25 both adopt variable frequency motors, and the uniformity of the original green liquor and the flocculating agent is ensured by adjusting the rotating speed (usually 4-26r/min) of the mixing chamber stirrer 31; the mud scraper has the advantages that the rotating speed of the mud scraper is too high, the sediment particles are easily disturbed, the mud layer at the bottom can be thickened at too low rotating speed, the torque of the mud scraper is further increased, the settled green mud can be rapidly collected into a bottom mud pit by adjusting the rotating speed of the discharge rake main shaft 32 (the rotating speed is usually 0.07-0.12r/min), and the stability of the torque value is ensured, so that the equipment is reliable in operation.
According to the invention, 6 liquid distribution pipes are mutually arranged at 60 degrees by rotating the liquid distribution pipes, the original green liquid can be relatively uniformly distributed on the section of the whole cylinder in the rotating process, and solid matters in the original green liquid can be more quickly settled; the flocculating agent is added into the original green liquor, so that the sedimentation speed of suspended matters in the original green liquor is increased, and the sedimentation speed can reach about 1.75 m/h; according to the structure of the middle overflow weir and the edge overflow weir, the green cleaning liquid in the middle of the liquid level can be collected to the edge overflow weir more quickly through the middle overflow weir, so that the green cleaning liquid below the liquid level can rise more quickly; in the invention, the structure that the discharging rake and the liquid distribution pipe synchronously rotate runs at a low rotating speed of 0.07r/min, so that the disturbance of a rotating part to liquid in the rotating process is prevented, and green mud deposited at the bottom layer is collected to a mud pit in the middle and is pumped away; the invention discloses a mixing chamber for mixing a flocculating agent and an original green liquor, wherein the mixing chamber adopts a mode of adding the flocculating agent at multiple points, and a stirrer is additionally arranged in the mixing chamber to realize the full mixing of the flocculating agent and the original green liquor, so that the combination of solid matters in the original green liquor and the flocculating agent is facilitated, and the clarification effect is further improved. Adding flocculating agent at multiple points, uniformly mixing and settling, wherein 5 flocculating agent liquid inlet pipes are arranged in a designed mixing chamber, and a stirrer is arranged in the center of the mixing chamber; the flocculant and the original green liquor are fully mixed in the mixing chamber, and the sedimentation speed of the original green liquor is increased by the flocculant solution. Fully mixing the flocculant solution with the raw green liquor through a mixing chamber in the middle of the cylinder. Rotatory cloth liquid, even settlement, 6 cloth liquid pipe are indirect with the central axis connection, along with the center pin low-speed rotation, cloth liquid pipe is last to have equipped a plurality of exports, and the export farthest from the barrel center has been close the barrel edge, and cloth liquid pipe cloth liquid union coupling mixing chamber, the solution of misce bene passes through cloth liquid pipe and flows in the barrel, can directly reach the barrel edge through the export that cloth liquid pipe is farthest from the barrel center and begin to subside. And (3) synchronously overflowing and discharging liquid, wherein overflow weirs are designed at the edge of the cylinder and the center of the cylinder, clear green liquid in the middle of the liquid level can overflow into the middle overflow weir, and meanwhile, clear green liquid at the edge of the liquid level can overflow into the edge overflow weir, so that synchronous overflow is realized. Back washing, wherein a back washing water pipe is designed in the mixing chamber, the pipe orifice positively washes the centers of 6 liquid distribution pipes, a water inlet valve of the back washing water pipe is periodically opened, and high-pressure water washes the liquid distribution pipes. The concentric double-rotating-speed reducer is characterized in that a set of mud-scraping discharge rake is needed in view of the requirement of the function of equipment, a stirrer for mixing action is needed, the stirrer and the discharge rake need different rotating speeds and are concentric two shafts, a speed reducer which can independently drive two output shafts and is concentric with the two output shafts is needed to be selected, and after the investigation of multiple speed reducer suppliers in China, the speed reducer is finally found, and the concentric double-speed reducer is named according to the function.
Compared with the traditional green liquor clarifier with the same specification, the equipment has the advantages of high sedimentation efficiency, small occupied area, low energy consumption and novel structure, and belongs to a domestic pioneer product. The sedimentation speed is increased by adding the flocculating agent into the mixing chamber with the novel structure, and the sedimentation speed can reach 1.75m/h, so that the productivity of equipment is improved. Adopt concentric syntropy biax output speed reducer, adopt the structure of the interior mixing chamber of barrel mixed former green liquor and flocculating agent, need not to increase mixing apparatus, compact structure saves the cost. By adopting a novel liquid distribution pipe structure and rotating liquid distribution, the sectional area of the cylinder body is fully utilized, and the capacity of equipment is improved. Compared with the traditional clarifier, the structure is compact, the occupied area is small, the specification is small, the material consumption is less, and the cost is low. The equipment is provided with a backflow pipeline to prevent the liquid inlet pipe from being blocked, and the internal liquid distribution pipe is provided with a back flushing water pipe to automatically clean the liquid distribution pipe at regular intervals. Convenient operation and maintenance, long service life of spare parts and safe and reliable operation. The mud scraping rake and the stirring speed are adjustable, the application range is wide, the rotating speed can be properly adjusted according to the suspended matter content of the green liquor after the solid content of the original green liquor is changed, and the speed adjusting range is 0.07-0.12 r/min. The matched flocculant preparation system has the advantages that the addition amount of the flocculant can be adjusted according to the solid content of the original green liquor and the amount of the green liquor to be treated, and the adjustable range is wide. The structure that the middle overflow weir and the edge overflow weir synchronously overflow to discharge liquid is adopted, the disturbance of the upper layer green liquor on the settling velocity of the lower layer micro solid matters is reduced, the green liquor on the section of the surface layer cylinder is relatively synchronously and uniformly collected to an outlet, the solid content of the obtained green liquor is low, and the solid content can reach 30 ppm. The advantages that are finally presented are: the capacity of the high-efficiency green liquor clarifier is 4.8 times of that of a common clarifier with the same specification, and the cost performance of the high-efficiency green liquor clarifier selected under the condition of specific capacity is high.
The foregoing is illustrative of the best mode of the invention and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The scope of the present invention is defined by the appended claims, and any equivalent modifications based on the technical teaching of the present invention are also within the scope of the present invention.
Claims (6)
1. The high-efficiency clarifier for green liquor is characterized in that: comprises a stirring device (3); the stirring device (3) comprises a mixing chamber (33) and a mixing chamber stirrer (31), the mixing chamber (33) comprises an upper mixing chamber (331), a plurality of flocculating agent inlets (334) are formed in the upper mixing chamber (331), and the flocculating agent inlets (334) are connected with a flocculating agent liquid inlet pipe; a mixing chamber stirrer (31) is arranged on the central axis of the mixing chamber (33);
the stirring device (3) comprises a mixing chamber (33), the mixing chamber (33) comprises a lower mixing chamber (332), the lower mixing chamber (332) is connected with a plurality of liquid distribution pipes (34), each liquid distribution pipe (34) comprises a liquid distribution pipe (341), the pipe diameters of the liquid distribution pipes (341) are gradually reduced from one end close to the mixing chamber (33) to the other end far away from the mixing chamber (33), and the liquid distribution pipes (341) are of concentric diameter-variable structures;
the stirring device (3) comprises a mixing chamber (33) and a mixing chamber stirrer (31), the mixing chamber (33) comprises an upper mixing chamber (331), and the bottom of the upper mixing chamber (331) is provided with a back flushing water gap (335);
the overflow weir (4) is further included, and the overflow weir (4) comprises a middle overflow weir (41), a diversion trench (42) and an edge overflow weir (43);
the middle overflow weir (41) is of an octagonal structure, and the cross section of the middle overflow weir is U-shaped;
the section of the diversion trench (42) is U-shaped, and two ends of the diversion trench (42) are respectively connected with the middle overflow weir (41) and the edge overflow weir (43);
the edge overflow weir (43) and the equipment cylinder (5) are welded into a whole, and the section of the edge overflow weir (43) is a U-shaped section.
2. The high efficiency clarifier for green liquor according to claim 1, characterized in that: the area within the octagonal inner region of the intermediate weir (41) is 1/2 of the area of the octagonal outer-to-edge weir (43) region.
3. The high efficiency clarifier for green liquor according to claim 1, characterized in that: the device is characterized by further comprising a driving device (2), wherein the driving device (2) comprises a discharge rake speed reducer output shaft (24) and a mixing chamber stirrer speed reducer output shaft (27), and the axis of the discharge rake speed reducer output shaft (24) is overlapped with the axis of the mixing chamber stirrer speed reducer output shaft (27).
4. The high efficiency clarifier for green liquor according to claim 3, characterized in that: the upper part of an output shaft (24) of the discharging rake speed reducer is connected with a discharging rake planetary speed reducer (23), the upper part of the discharging rake planetary speed reducer (23) is connected with a discharging rake speed reducer (22), and the upper part of the discharging rake speed reducer (22) is connected with a discharging rake driving motor (21);
the lower part of the output shaft (24) of the discharge rake speed reducer is connected with a discharge rake main shaft (32);
the upper part of the output shaft (27) of the mixing chamber stirrer speed reducer is connected with a mixing chamber stirrer speed reducer (26), and the upper part of the mixing chamber stirrer speed reducer (26) is connected with a mixing chamber stirrer motor (25);
the lower part of the output shaft (27) of the mixing chamber stirrer speed reducer is connected with a mixing chamber stirrer (31).
5. The high efficiency clarifier for green liquor according to claim 1, characterized in that: the stirring device (3) comprises a mixing chamber (33), the mixing chamber (33) comprises a discharge rake (35), a discharge rake main shaft (32) is connected to the upper part of the discharge rake (35), the discharge rake (35) comprises a rake arm (351) and rake teeth (352), a plurality of rake teeth (352) are arranged on the rake arm (351), and the rake teeth (352) are arranged along the conical bottom wall of the equipment cylinder (5).
6. The high efficiency clarifier for green liquor according to claim 1, characterized in that: the stirring device (3) comprises a mixing chamber (33), the mixing chamber (33) comprises an upper mixing chamber (331) and a lower mixing chamber (332), and the upper mixing chamber (331) and the lower mixing chamber (332) are sealed by ethylene propylene diene monomer gaskets;
the diameter of the mixing chamber cylinder (333) of the upper mixing chamber (331) is about 1/2 of the diameter of the equipment cylinder (5).
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| CN201711241334.8A CN108176085B (en) | 2017-11-30 | 2017-11-30 | High-efficiency clarifier for green liquor |
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| FI114899B (en) * | 2001-06-25 | 2005-01-31 | Outokumpu Oy | Method and apparatus for clarifying and / or thickening the sludge |
| CN202893009U (en) * | 2012-11-08 | 2013-04-24 | 淮北矿山机器制造有限公司 | Classifying and overflowing device of concentrator |
| CN104707371A (en) * | 2015-04-02 | 2015-06-17 | 北京市市政工程设计研究总院有限公司 | Novel mechanical stirring clarification tank |
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