CN103977915A - Fine-grain material centrifugal filtering and dewatering device - Google Patents
Fine-grain material centrifugal filtering and dewatering device Download PDFInfo
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- CN103977915A CN103977915A CN201410232221.1A CN201410232221A CN103977915A CN 103977915 A CN103977915 A CN 103977915A CN 201410232221 A CN201410232221 A CN 201410232221A CN 103977915 A CN103977915 A CN 103977915A
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Abstract
A fine-grain material centrifugal filtering and dewatering device comprises a frame, a housing, a motor, a drum and a speed regulator. A spindle of the motor penetrates the bottom of the housing to be connected with the drum, the spindle penetrates the housing to be provided with a sealing component, the upper portion of the housing is provided with an upper housing cover, the lower portion of the housing is provided with a liquid discharge outlet, the side wall of the drum is provided with a plurality of filtrate holes, and filter medium is attached to the inner wall of the drum. The upper portion of the drum is provided with an upper drum cover, the housing is provided with a feed pipe penetrating the upper housing cover and the upper drum cover to enter the drum, a mechanical sealing component is arranged at an inlet of the upper drum cover, the feed pipe is respectively provided with a suspension liquid feed system and an air feed system through pipelines, and the pipelines are provided with flow control valves. By coordinating pressurized filtering and centrifugal filtering, filtering speed can be accelerated by centrifugal force, dewatering speed is accelerated by compressed air, therefore dewatering process of a centrifugal filter is enhanced, solid-liquid separation efficiency is improved, residual water in centrifugal filter cakes is reduced and centrifugal dewatering effect of fine-grain materials is improved.
Description
Technical field
The present invention relates to solid-liquid separation technique field, particularly relate to a kind of fine centrifugal filtration dewater unit.
Background technology
Filter centrifugal is widely used in the industries such as food, medicine, chemical industry, oil, metallurgy, coal.At the manufacture field of coal, metalliferous mineral and nonmetallic mineral, Gu adopt the method for solid-separation, as screening, magnetic separation, electric separation, air dense medium sorting etc., valuable mineral can be separated from other mineral.But, sorting mineral processing is carried out conventionally in aqueous medium, washing process inevitably increases the moisture of product, and there is many adverse effects to aspects such as its transport, processing, utilizations in the moisture of product, from economizing on resources, efficiently utilize the angle of the energy, after choosing, product dehydrate is requisite link in mineral wet method dressing of coal by washing process.In coal preparation plant, conventionally adopt perforated wall centrifuge dehydration compared with coarse granule material, fine is selected decanter type or screen-bowl centrifuge dehydration.Compared with traditional vacuum filter, the product moisture that screen-bowl centrifuge obtains is lower, and this is lost in filtrate relevant with fine granule material to a certain extent.Conventionally, the specific area of fine is larger, and the moisture of material reduces and raises with grain graininess.Thereby the subparticle removing in material can be used as a kind of measure that reduces product moisture, but the method can increase the solids content in filtrate, reduces solid recovery rate.
Centrifugal filtration dehydration comprises filtration stage and de-liquid stage.Suspension enters after filter centrifugal, and solid particle and liquid medium are towards filter screen motion under the effect of centrifugal force, and the solid particle that is greater than sieve aperture is settled down at first screen surface and forms cake layer, and the liquid that density is lighter forms water layer on cake layer surface.Along with the passing of filtration time, liquid becomes filtrate through particle gap and the sieve aperture of cake layer; Be less than the particle of screen cloth hole, a part enters filtrate through particle gap and sieve aperture under liquid drives, and another part is stayed in filter cake by the interception of the pore structure of filtering layer.This process that removes filter cake superficial water becomes filtration stage.When filter process completes, the pore structure of filter cake is because capillarity can be full of liquid, and the process that removes filter cake capillary water is called the de-liquid stage.In the centrifugal dehydration process of material, controlling de-liquid speed is to control the key of filter cake final moisture.
The de-liquid speed of filter cake can be predicted by Darcy formula:
Wherein, Q express liquid flow rate, K represents the permeability of filter cake, and Δ P represents the pressure differential of filter cake both sides, and A represents filter area, the dynamic viscosity of μ express liquid, L represents the thickness of filter cake.In filter process, the pressure differential of filter cake both sides can represent by following relationship:
Wherein, the density of ρ express liquid, ω represents angular speed, r
0with r
brepresent respectively free water layer near the inner surface of axis, filter cake near the inner surface of axis the distance to centrifuge rotation.Can obtain formula (3) by formula (1) and formula (2):
Can be found out the thickness (r of the rate of filtration and free water layer by formula (3)
b-r
0) and square positive correlation of angular speed.
Can be found out by formula (2), after the free water layer on filter cake surface is removed, i.e. r
b=r
0time, Δ P is zero.Along with the further minimizing of water layer in filter cake, i.e. r
0>r
btime, the pressure of filter cake inside is less than the pressure of surrounding environment, and this is as described in Zeitsch model.Zeitsch model calculates and shows, filter cake internal pressure can have a negative impact, and this negative effect meeting is along with the increase of filter cake thickness continues grow.
The de-liquid stage of centrifugal filtration, under condition in filter cake both sides without positive differential pressure, centrifuge can obtain powerful centrifugal force by High Rotation Speed, in the time that centrifugal force is greater than making a concerted effort of capillary resistance, negative pressure resistance, the drag force that flows, filter cake still can remove moisture, but need to consume a large amount of electric energy and higher maintenance cost could obtain lower filter cake moisture, this de-liquid mode can produce the problem of high energy consumption and high maintenance cost.
Summary of the invention
Technical problem: the object of the invention is in order to overcome deficiency of the prior art, provide that a kind of rate of filtration is fast, filter cake moisture is low, equipment energy consumption and the low fine centrifugal filtration dewater unit of maintenance cost.
Technical scheme: fine centrifugal filtration dewater unit of the present invention, comprise frame, be located at the casing of upper rack and the motor of frame lower, in casing, be provided with rotary drum, on motor, be connected with speed regulator, the main shaft of motor is connected with rotary drum through bottom of shell, and main shaft is provided with black box through casing place; Described casing top is provided with casing upper cover, and bottom is provided with leakage fluid dram, on described rotary drum sidewall, has some filtrate hole, is attached with filter medium on inwall; The top of rotary drum is provided with rotary drum upper cover, casing is provided with through casing upper cover, rotary drum upper cover and enters the feeding pipe in rotary drum, enter rotary drum upper cover porch and be provided with mechanical sealing assembly, on feeding pipe, be connected with by the road respectively suspension material feeding system and gas material feeding system, on each pipeline, be respectively equipped with flow control valve.
Described suspension material feeding system comprises pan feeding pump, agitator, one way stop peturn valve, speed regulator, wherein speed regulator connects pan feeding pump, the feeding pipe of pan feeding pump is connected with agitator bottom, on the discharge nozzle of pan feeding pump, one way stop peturn valve is housed, and the discharge pipe end of pan feeding pump is connected on feeding pipe.
Described gas material feeding system comprises the air compressor machine that is connected with feeding pipe, is connected to gas flowmeter, Pressure gauge, one way stop peturn valve on air compressor machine outlet pipe in turn.
Beneficial effect: centrifugal intensity is large, centrifugal factor is adjustable because spin-on filter device has, and compressed air has the advantage that pressure limit is wide.The present invention adopts pressurized equipment for filter centrifugal provides compressed air, can improve the internal pressure of filter chamber, increases the pressure differential of centrifugal filtration cake layer both sides, improves filtration drive power, and accelerating liquid removes speed.Major advantage has:
The present invention is by collaborative to pressure filtration and centrifugal filtration, utilize centrifugal force to accelerate filtering rate, utilize compressed air to accelerate de-liquid speed, strengthen the dehydration of filter centrifugal with this, improve solid-liquid separation efficiency, reduce the residual moisture in centrifugal filtration filter cake simultaneously, improved the centrifugal dehydration effect of fine.
The present invention adopts compressed air to improve the internal pressure of filter centrifugal perforate bowl, utilizes rate of water loss in Darcy formula to increase the relation accelerating with pressure reduction, by increasing the pressure differential of filter cake both sides, strengthens filtration drive power, strengthen dewatering process.In dehydration, compressed air is introduced filter centrifugal by gas material feeding system, increases the internal pressure of perforate bowl by compressed air, increases the pressure differential of filter cake both sides, improves filtration drive power, accelerates filtering rate and de-liquid speed.Test finds, and improves compared with filtering rate, and compressed air is more obvious to improving the effect of de-liquid speed.
Correlative study shows, the internal pressure of filter cake can be according to the thickness of filter cake and eccentric angle Speed Reduction to zero or negative value, compressed air is introduced behind the inside of centrifuge perforate bowl, can produce in filter cake both sides positive differential pressure, this pressure reduction can accelerating liquid flow rate, reduce the saturation degree of material, passage of air effect simultaneously also can be taken away a part of water, further reduces the residual moisture of filter cake.For the fine of extremely difficult dehydration, described fine centrifugal filter device matches with filter aid, improves the hydrophobicity of solid particle by adding filter aid, reduces the capillary pressure of cake layer, accelerates de-liquid speed.
To depart from the rate of water loss in heart filtered fluid stage extremely beneficial to improving for the pressure differential that the present invention increases filter cake both sides, and passage of air also can carry the part water in cake layer hole, reduces the water content of filter cake.Compared with prior art, effectively improved centrifuge filter efficiency, reduce filter cake residual moisture, improve the dehydrating effect of filter centrifugal, it is simple in structure, easy to operate, the rate of filtration is fast, and filter cake moisture is low, equipment energy consumption is low, and maintenance cost is few, has practicality widely.
Brief description of the drawings
Fig. 1 is the structural representation of fine centrifugal filtration dewater unit of the present invention.
In figure: 1-frame, 2-casing, 3-bolt, 4-sealing ring, 5-casing upper cover, 6-black box, 7-electric machine main shaft, 8-motor, 9-speed regulator, 10-bolt, 11-sealing ring, 12-rotary drum, 13-bolt, 14-sealing ring, 15-rotary drum upper cover, 16-filtrate hole, 17-filter medium, 18-mechanical sealing assembly, 19-bolt, 20-feeding pipe, 21-suspension material feeding system, 22-gas material feeding system, 23-leakage fluid dram.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
Fine centrifugal filtration dewater unit of the present invention, is mainly made up of frame 1, casing 2, rotary drum 12, motor 8, speed regulator 9.Casing 2 is located at the top of frame 1, and motor 8 is located at the bottom of frame 1, is provided with rotary drum 12 in casing 2, is connected with speed regulator 9 on motor 8, and the main shaft 7 of motor 8 is connected with rotary drum 12 through casing 2 bottoms, and main shaft 7 is provided with black box 6 through casing 2 places, described casing 2 tops are provided with casing upper cover 5, and bottom is provided with leakage fluid dram 23, and casing upper cover 5 is connected with casing 2 by bolt 3, sealing ring 4, on described rotary drum 12 sidewalls, have some filtrate hole 16, are attached with filter medium 17 on inwall, the top of rotary drum 12 is provided with rotary drum upper cover 15, casing 2 is provided with through casing upper cover 5, rotary drum upper cover 15 enters the feeding pipe 20 in rotary drum 12, feeding pipe 20 is fixed on the center of casing upper cover 5, enter rotary drum upper cover 15 porch and be provided with mechanical sealing assembly 18, on feeding pipe 20, be connected with by the road respectively suspension material feeding system 21 and gas material feeding system 22, suspension material feeding system 21 is connected to feeding pipe 20 tops with gas material feeding system 22, suspension material feeding system 21 is connected to feeding pipe 20 tops with gas material feeding system 22, feeding pipe 20 bottoms are through rotary drum upper cover 15 center, between rotary drum upper cover 15 and feeding pipe 20, mechanical sealing mechanism 18 is set, mechanical sealing assembly 18 is bolted on rotary drum upper cover 15, rotary drum upper cover 15 is by bolt 13, sealing ring 14 is fixed on rotary drum 12 upper surfaces, rotary drum 12 is by bolt 10, packing ring 11 is fixed on main shaft 7 upper surfaces of motor 8, rotary drum 12 sidewalls have filtrate hole 16, filter medium 17 is attached on the inwall of rotary drum 12, on each pipeline, be respectively equipped with flow control valve.
Described suspension material feeding system 21 comprises pan feeding pump, agitator, one way stop peturn valve, speed regulator, wherein speed regulator connects pan feeding pump, the feeding pipe of pan feeding pump is connected with agitator bottom, on the discharge nozzle of pan feeding pump, one way stop peturn valve is housed, the discharge pipe end of pan feeding pump is connected on feeding pipe 20; Suspension material feeding system utilizes agitator to size mixing to guarantee effect suspension stabilization, and adopts to have and press or mode with no pressure is interrupted or continuously suspension is sent into centrifuge filter chamber.
Described gas material feeding system 22 comprises the air compressor machine that is connected with feeding pipe 20, is connected to gas flowmeter, Pressure gauge, one way stop peturn valve on air compressor machine outlet pipe in turn.Described gas material feeding system, can produce pulsed, discontinuous or compressed air continuously, and the compressed air of certain volume and certain pressure is sent into centrifuge filter chamber.
Operation principle: utilize gas material feeding system that compressed air is introduced in perforate bowl, produce the pressure of graded along the thickness direction of cake layer, centrifugal filtration acts synergistically with pressure filtration, until that filter cake moisture is down to is minimum.In centrifugal dehydration process, introduce compressed air, can effectively increase the pressure differential of cake layer both sides, increase filtration drive power, accelerating liquid removes speed, reach the filter efficiency that improves filter centrifugal, reduce the residual moisture in filter cake, improve the object of the centrifugal dehydration effect of fine.When work, solidliquid mixture enters centrifuge perforate bowl by suspension material feeding system from feeding pipe, rotating filter rotary drum, and regulate the rotating speed of bowl by speed regulator, solid particle in mixture and liquid medium are because rotation obtains centrifugal force, solid material is under the crown_interception of filter medium and form filter cake, and liquid sees through filter cake and discharges from filtrate hole, until basic no liquid medium in rotary drum.
Claims (3)
1. a fine centrifugal filtration dewater unit, it is characterized in that: it comprises frame (1), is located at the casing (2) on frame (1) top and the motor (8) of frame (1) bottom, in casing (2), be provided with rotary drum (12), on motor (8), be connected with speed regulator (9), the main shaft (7) of motor (8) is connected with rotary drum (12) through casing (2) bottom, and main shaft (7) locates to be provided with black box (6) through casing (2); Described casing (2) top is provided with casing upper cover (5), bottom is provided with leakage fluid dram (23), on described rotary drum (12) sidewall, have some filtrate hole (16), on inwall, be attached with filter medium (17); The top of rotary drum (12) is provided with rotary drum upper cover (15), casing (2) is provided with through casing upper cover (5), rotary drum upper cover (15) and enters the feeding pipe (20) in rotary drum (12), enter rotary drum upper cover (15) porch and be provided with mechanical sealing assembly (18), on feeding pipe (20), be connected with by the road respectively suspension material feeding system (21) and gas material feeding system (22), on each pipeline, be respectively equipped with flow control valve.
2. fine centrifugal filtration dewater unit according to claim 1, it is characterized in that: described suspension material feeding system (21) comprises pan feeding pump, agitator, one way stop peturn valve, speed regulator, wherein speed regulator connects pan feeding pump, the feeding pipe of pan feeding pump is connected with agitator bottom, on the discharge nozzle of pan feeding pump, one way stop peturn valve is housed, the discharge pipe end of pan feeding pump is connected on feeding pipe (20).
3. fine centrifugal filtration dewater unit according to claim 1, is characterized in that: described gas material feeding system (22) comprises the air compressor machine that is connected with feeding pipe (20), is connected to gas flowmeter, Pressure gauge, one way stop peturn valve on air compressor machine outlet pipe in turn.
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| CN201410232221.1A CN103977915A (en) | 2014-05-28 | 2014-05-28 | Fine-grain material centrifugal filtering and dewatering device |
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|---|---|---|---|
| CN201410232221.1A CN103977915A (en) | 2014-05-28 | 2014-05-28 | Fine-grain material centrifugal filtering and dewatering device |
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| CN201410232221.1A Pending CN103977915A (en) | 2014-05-28 | 2014-05-28 | Fine-grain material centrifugal filtering and dewatering device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107224775A (en) * | 2016-03-24 | 2017-10-03 | 卢奕祥 | A kind of device for filtering impurities for brewing the vinegar |
| CN110743716A (en) * | 2019-11-07 | 2020-02-04 | 广州市妙伊莲科技有限公司 | A centrifuge that convenience is high for handling domestic sewage |
| CN110898503A (en) * | 2019-12-21 | 2020-03-24 | 高云芝 | Method for separating mixed liquid of filter |
| CN111675216A (en) * | 2020-07-22 | 2020-09-18 | 湖南鑫恒环境科技有限公司 | Method and device for preparing activated carbon by extracting coal slime |
| CN112326496A (en) * | 2020-04-28 | 2021-02-05 | 胡力涛 | Material moisture content detection device for microwave technology |
| CN113227692A (en) * | 2019-11-18 | 2021-08-06 | 株式会社Lg化学 | Pressurized centrifugal dehydrator |
| CN113262888A (en) * | 2021-05-21 | 2021-08-17 | 深圳市考拉生态科技有限公司 | Filter type centrifuge and use method thereof |
| CN113286764A (en) * | 2019-11-11 | 2021-08-20 | 株式会社Lg化学 | Centrifugal dehydrator and centrifugal dehydration method |
| CN114147288A (en) * | 2021-12-13 | 2022-03-08 | 上海德瀛睿创半导体科技有限公司 | Wire saw machine and wire saw system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107224775A (en) * | 2016-03-24 | 2017-10-03 | 卢奕祥 | A kind of device for filtering impurities for brewing the vinegar |
| CN110743716A (en) * | 2019-11-07 | 2020-02-04 | 广州市妙伊莲科技有限公司 | A centrifuge that convenience is high for handling domestic sewage |
| CN113286764A (en) * | 2019-11-11 | 2021-08-20 | 株式会社Lg化学 | Centrifugal dehydrator and centrifugal dehydration method |
| CN113227692A (en) * | 2019-11-18 | 2021-08-06 | 株式会社Lg化学 | Pressurized centrifugal dehydrator |
| CN113227692B (en) * | 2019-11-18 | 2023-03-17 | 株式会社Lg化学 | Pressurized centrifugal dehydrator |
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| CN112326496A (en) * | 2020-04-28 | 2021-02-05 | 胡力涛 | Material moisture content detection device for microwave technology |
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| CN111675216A (en) * | 2020-07-22 | 2020-09-18 | 湖南鑫恒环境科技有限公司 | Method and device for preparing activated carbon by extracting coal slime |
| CN113262888A (en) * | 2021-05-21 | 2021-08-17 | 深圳市考拉生态科技有限公司 | Filter type centrifuge and use method thereof |
| CN114147288A (en) * | 2021-12-13 | 2022-03-08 | 上海德瀛睿创半导体科技有限公司 | Wire saw machine and wire saw system |
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Application publication date: 20140813 |
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