CN109663412A - A kind of method of centrifugal filtration - Google Patents
A kind of method of centrifugal filtration Download PDFInfo
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- CN109663412A CN109663412A CN201811559987.5A CN201811559987A CN109663412A CN 109663412 A CN109663412 A CN 109663412A CN 201811559987 A CN201811559987 A CN 201811559987A CN 109663412 A CN109663412 A CN 109663412A
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- filter cake
- bed
- filtration layer
- media filtration
- filter
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
Abstract
A kind of method of centrifugal filtration, first step filter first batch material, obtain the first filter cake；First filter cake is divided into and unloads the bed of material and media filtration layer by second step；Third step S3 is scraped and described is unloaded the bed of material；Four steps filters next batch material, obtains the second filter cake, second filter cake includes that the media filtration layer and second unload the bed of material；5th step scrapes described second and unloads the bed of material；6th step repeats the four steps to the 5th step and scrapes the media filtration layer until the moisture percentage for unloading the bed of material reaches predetermined value；It repeats first step and obtains filtering final product until material filtering terminates to the 6th step；The present invention reduces each batch material and wears filter to the direct impact of strainer, fine granular materials, reduce the damage of scraping equipment and strainer by retaining material filter layer, more accurate to the control of filtrate scraping, so that finally filtrate moisture percentage is more stable.
Description
Technical field
This patent disclosure relates generally to filtration arts, more particularly, to a kind of method of scraper process control in centrifugal filtration.
Background technique
Currently, centrifugal solid-liquid separation equipment, in separation of solid and liquid process, material is all direct arrival strainer, carried out in strainer
After de- liquid processing, filter cake is formed, then filter cake is scraped by scraper plate, substantially once take off scraper of liquid.It when scraper, is filtered all
Cake is disposably scraped along strainer.In filtering, rotary drum runs at high speed centrifuge, and scraper plate is collapsed state, when filtering finishes, rotary drum
When being changed into low speed rotation, scraper plate is adjusted close to rotatory drum wall, material is scraped down.In this technical process, carry out every time
When the material filtering of new lot, the material that is filtered forms direct impact to strainer, and impact it is larger, the abrasion of strainer compared with
Fastly, the service life of strainer is reduced.
At filtering initial stage, when not forming filter cake on strainer, the material that partial size is less than aperture of filter screen can largely wear filter, reduce
Solid material yield.With the progress of filtration operation, the fine grained in material is gradually accumulated, and can be had an impact to de- liquid effect,
Moisture percentage in filter cake is caused to increase.After filtering, when scraper plate scrapes filter cake, the position that scraper plate is contacted with strainer will cause filter
The abrasion of net and scraper plate influences the service life of scraper plate and strainer.
Problems of the prior art are that each batch filter material is larger to the directly impact of strainer；Filtering initial stage grain
The small material particles of diameter can wear filter；Filtering later period fine granular materials will cause filter structure blocking, and rate of cake moisture content is caused to increase；
Scraper plate can wear scraper plate and strainer with frequently contacting for strainer.
Summary of the invention
The problem to be solved in the present invention is, accurate to control scraper process, solves each batch filter material to the direct of strainer
It impacts larger；The small material particles of filtering initial stage partial size can wear filter；Filtering later period fine granular materials will cause filter structure blocking,
Rate of cake moisture content is caused to increase；Scraper plate frequently contacts the problem of wearing scraper plate and strainer with strainer, and it is wet to control containing for filter cake
Amount reduces the abrasion to equipment.
The present invention provides a kind of methods of centrifugal filtration, wherein including, first step S1 filters first batch material,
Obtain the first filter cake；First filter cake is divided into and unloads the bed of material and media filtration layer by second step S2；Third step S3 is protected
The media filtration layer is stayed, scrapes and described unloads the bed of material；Four steps S4 filters next batch material, obtains the second filter cake, described
Second filter cake includes that the media filtration layer and second unload the bed of material；5th step S5 retains the media filtration layer, scrapes institute
It states second and unloads the bed of material；6th step S6 repeats the four steps S4 to the 5th step S5, until the moisture percentage for unloading the bed of material
Reach predetermined value, scrapes the media filtration layer；7th step S7 repeats first step S1 to the 6th step S6, until material
Filtering terminates, and obtains filtering final product；The bed of material that unloads refers to the part being scraped in first filter cake；The media filtration layer
Refer to the part that screen surface is retained in first filter cake, for being filtered jointly to subsequent material with strainer.
According to embodiment of the present invention, the second step S2 further includes that detection material obtains nature parameters, is examined
Survey first filter cake and obtain filter cake parameter, obtain spin-on filter device parameter, according to the nature parameters, filter cake parameter, from
At least one of in heart filter plant parameter, determine the thickness of the media filtration layer.
According to embodiment of the present invention, the nature parameters of the material include at least one in following parameter:
Solid hardness, abrasion resistance, granule size and the moisture percentage for unloading the bed of material.
According to embodiment of the present invention, the filter cake parameter includes at least at least one of following parameter: filter
Cake resistivity, the compressibility of filter cake, porosity.
According to embodiment of the present invention, the thickness of the media filtration layer is determined according to the following formula:
ω1=σ1·FIt is viscous+σ2·D+σ3·P+A；
ω2=σ4·V+σ5·Res+B；
Wherein, ω1It is first thickness coefficient；
ω2It is second thickness coefficient；
FIt is viscousIt is adhesion strength between material particles；
D is material particles partial size；
P is filter cake porosity；
A is the first correction factor；
V is rotary drum revolving speed；
Res is the abrasion resistance of material particles；
B is the second correction factor；
σ1、σ2、σ3、σ4、σ5It is weight coefficient；
The thickness of the media filtration layer is directly proportional to the first thickness coefficient, with the second thickness coefficient at anti-
Than.
According to embodiment of the present invention, the predetermined value refer to can satisfy subsequent technique unload the bed of material containing wet
The maximum value of rate.
According to embodiment of the present invention, the bed of material is unloaded described in disposably scraping.
The present invention reduces direct impact of each batch material to strainer, reduces thin by retaining material filter layer
Grain material wears filter, only scrapes charge and discharge layer in each partial circulating by scraping equipment, reduces and scrapes connecing for equipment and strainer
Number is touched, the damage of scraping equipment and strainer, the detection by systemic circulation and to filtrate property, to filtrate scraping are reduced
Control it is more accurate so that final filtrate moisture percentage is more stable.
Detailed description of the invention
Fig. 1 is the step schematic diagram of a kind of method of centrifugal filtration；
Fig. 2 is the schematic diagram of one embodiment of the present of invention.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, and reference label refers to the group in the present invention
Part, technology, realizing under appropriate circumstances so as to advantages and features of the invention can be easier to be understood.Following description is pair
The materialization of the claims in the present invention, and other specific implementations not clearly stated relevant to claim also belong to power
The range that benefit requires.
Fig. 1 shows the step schematic diagram of a kind of method of centrifugal filtration.
As shown in Figure 1, a kind of method of centrifugal filtration, wherein including first step S1 filters first batch material, obtains
To the first filter cake；First filter cake is divided into and unloads the bed of material and media filtration layer by second step S2；Third step S3 retains
The media filtration layer scrapes and described unloads the bed of material；Four steps S4 filters next batch material, obtains the second filter cake, and described the
Two filter cakes include that the media filtration layer and second unload the bed of material；5th step S5 retains the media filtration layer, scrapes described
Second unloads the bed of material；6th step S6 repeats the four steps S4 to the 5th step S5, until the moisture percentage for unloading the bed of material reaches
To predetermined value, the media filtration layer is scraped；First step S1 to the 6th step S6 is repeated, until material filtering terminates, is obtained
Filter final product；The bed of material that unloads refers to the part being scraped in first filter cake；The media filtration layer refers to described first
The part of screen surface is retained in filter cake, for being filtered jointly to subsequent material with strainer.
The material refers to that Solid-liquid mixture is starched, and due to the limitation of the processing capacity of filter plant, the material, which uses, to be divided
Batch is continuously filtered.When first described material enters filter plant, material is filtered by strainer, filtrate passes through
Strainer is collected, and material forms filter cake in screen surface, and filter cake is collected, that is, completes the filtering of this batches.?
In the present invention, material filters on strainer form filter cake after, scraper or scraper plate only scrape one of filter cake surface layer in discharging
Point, certain thickness filter cake is left in screen surface, the filter cake that this part is left is as media filtration layer.When next group material
When into filter, material is filtered jointly by the media filtration layer and strainer, i.e., material first passes through the filter
Expect filter layer, be then passed through strainer, so that the fine grained in material is when passing through the media filtration layer with liquid, stroke ratio is only
Increased when only passing through strainer, fine grained is intercepted by the media filtration layer, and filter is worn in reduction.On the other hand, in the present invention, under
A batch of material is in the effect by filter plant centrifugal force, and what is impacted first is media filtration layer, due to pressing for filtrate
Contracting is buffered, to reduce direct impact of the filtrate to strainer.
During constantly scraping charge and discharge layer, the beavers such as scraper scraper plate have grinding to solid particle in filter cake and break
Broken effect makes fine grained gradually block the hole of the media filtration layer, meanwhile, the fine grained in material can also enter filtrate mistake
Filtering layer when reaching a certain level, can produce de- liquid effect as the hole in media filtration layer is gradually filled by fine granular materials
It is raw to influence, keep de- liquid slow, moisture percentage in filter cake is caused to increase.Therefore, in the present invention, when retaining one section of media filtration layer
Between, it blows off after unloading the certain number of the bed of material, needs to wipe off on the media filtration layer, recycle the filtrate of next batch to be formed new
Media filtration layer thus completes a scraper systemic circulation period.In this process, scraper plate and strainer are only in each systemic circulation
At the end of contact, both all make to contact to for each scraper, frequency of exposure greatly reduces, to reduce because of scraper plate and filter
Loss both caused by the frequency of exposure of net is excessive.
According to embodiment of the present invention, the second step S2 further includes that detection material obtains nature parameters, is examined
Survey first filter cake and obtain filter cake parameter, obtain spin-on filter device parameter, according to the nature parameters, filter cake parameter, from
At least one of in heart filter plant parameter, determine the thickness of the media filtration layer.
First batch material to be filtered forms filter cake after the filtering of the strainer, in screen surface, it is necessary first to right
The filter cake carries out the measurement of various properties, the i.e. detection of property, such as porosity, aqueous ratio, particle size, viscosity.Again
According to the nature parameters of filter cake, filter cake is divided, the thickness of the media filtration layer mainly retained needs is determined,
And rest part all incorporates into unload the bed of material in filter cake, will unload the bed of material and scrapes.It in this process, can be because of material not
Together, required parameter is accepted or rejected.Such as: when for influence maximum of the viscosity in filtering, pay the utmost attention to viscometric properties
Parameter.Moreover, using filter cake nature parameters when, a variety of different properties because its on filter process influence size not
Together, when determining the thickness of the media filtration layer, weight is different.
According to embodiment of the present invention, the nature parameters of the material include at least one in following parameter:
Solid hardness, abrasion resistance, granule size and the moisture percentage for unloading the bed of material.
According to embodiment of the present invention, the filter cake parameter includes at least at least one of following parameter: filter
Cake resistivity, the compressibility of filter cake, porosity.
Factor that cake filtration layer is filtered material is influenced in addition to the property of filter cake itself, it is also necessary to consider material sheet
The property of body.Because when scraping the bed of material described in the scraping, scraper plate can generate the broken effect of grinding to material particles, be formed tiny
Particle.When the hardness of material is larger, it is hardly formed fine particle, conversely, being readily formed.So determining the filtrate
When the thickness of filter layer, the range that the property of material is taken into consideration is needed.
After obtaining the property of property and filter cake of material, the thickness of media filtration layer can be calculated: according to
Following formula determines the thickness of the media filtration layer:
ω1=σ1·FIt is viscous+σ2·D+σ3·P+A；
ω2=σ4·V+σ5·Res+B；
Wherein, ω1It is first thickness coefficient；
ω2It is second thickness coefficient；
FIt is viscousIt is adhesion strength between material particles；
D is material particles partial size；
P is filter cake porosity；
A is the first correction factor；
V is rotary drum revolving speed；
Res is the abrasion resistance of material particles；
B is the second correction factor；
σ1、σ2、σ3、σ4、σ5It is weight coefficient；
The thickness of the media filtration layer is directly proportional to the first thickness coefficient, with the second thickness coefficient at anti-
Than.
According to embodiment of the present invention, the predetermined value refer to can satisfy subsequent technique unload the bed of material containing wet
The maximum value of rate.
Every kind of material can set the moisture percentage of its filtration product when being filtered, and unload the bed of material in the present invention first and want
Meet the above-mentioned restriction to moisture percentage.With the progress of filtering, clogged when the hole of the media filtration layer by fine particle
In the process, it the media filtration layer and unloads the moisture percentage of the bed of material and can be gradually increasing, when the moisture percentage for unloading the bed of material is close to above-mentioned
When to the restriction of moisture percentage, indicate that the media filtration layer is no longer appropriate for serving as filter layer, in order to keep filtration product containing wet
The qualification of rate needs to scrape on the media filtration layer.
The predetermined value can be adjusted with the difference that difference, the technique of material require.
According to embodiment of the present invention, the bed of material is unloaded described in disposably scraping.
It is described unload the bed of material and can also be divided into repeatedly scraped, but in each scraping, grounds travel all is generated to filter cake
Broken effect generates fine particle and enters cake filtration layer, reduces the service life of cake filtration layer, and the present invention is preferably disposable
Bed of material scraping is unloaded by described.But due to the intensity of the limitation of the self power of filter plant and tube sheet, intensity of filter cake etc. because
The influence of element, use number as few as possible scrape the bed of material that unloads.The media filtration layer can be made to retain longer
Time, the further number for reducing scraper plate and strainer contact, the loss both reduced.
Fig. 2 shows one embodiment of the present of invention.
As shown in Fig. 2, Row control, PLC control system connecting detection terminal and tune can be carried out using PLC control system
Terminal is saved, the detection terminal is used to obtain the various properties of material, the various properties of filtrate, media filtration layer and unloads the bed of material
The characteristics such as moisture percentage, the process according to the invention setting executes program in PLC control system, obtains the inspection of detection device in real time
Survey filter cake next batch material filtering formed as a result, when material forms filter cake for the first time and when media filtration layer is scraped
It is divided into media filtration layer and unloads the bed of material；When the existing moisture percentage for unloading the bed of material reaches predetermined value, media filtration layer is carried out
Scraping, and control scraper plate carry out the adjusting etc. of scraping position.
The present invention reduces each batch material to the direct impact of strainer, fine granular materials by retaining material filter layer
Wear filter, by scrape equipment charge and discharge layer is only scraped in each partial circulating, reduce scraping equipment and strainer frequency of exposure,
Reduce the damage of scraping equipment and strainer, the detection by systemic circulation and to filtrate property, so that the control to filtrate scraping
Make more accurate, the moisture percentage of filtration product is more stable.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and this
Field technical staff can be designed alternative embodiment without departing from the scope of the appended claims.In claim
In, any reference symbol between parentheses should not be configured to limitations on claims.
Claims (7)
1. a kind of method of centrifugal filtration, wherein including,
First step (S1) filters first batch material, obtains the first filter cake；
First filter cake is divided into and unloads the bed of material and media filtration layer by second step (S2)；
Third step (S3) retains the media filtration layer, scrapes and described unloads the bed of material；
Four steps (S4) filters next batch material, obtains the second filter cake, second filter cake includes the media filtration layer
And second unload the bed of material；
5th step (S5) retains the media filtration layer, scrapes described second and unloads the bed of material；
6th step (S6) repeats the four steps (S4) to the 5th step (S5), until the moisture percentage for unloading the bed of material reaches
To predetermined value, the media filtration layer is scraped；
7th step (S7) repeats first step (S1) and obtains filtering whole production until material filtering terminates to the 6th step (S6)
Object；
The bed of material that unloads refers to the part being scraped in first filter cake；The media filtration layer refers to be protected in first filter cake
The part for staying in screen surface, for being filtered jointly to subsequent material with strainer.
2. detection material obtains nature parameters according to the method described in claim 1, the second step (S2) further includes, examine
Survey first filter cake and obtain filter cake parameter, obtain spin-on filter device parameter, according to the nature parameters, filter cake parameter, from
At least one of in heart filter plant parameter, determine the thickness of the media filtration layer.
3. according to the method described in claim 2, the nature parameters of the material include at least one in following parameter: solid
Hardness, abrasion resistance, granule size and the moisture percentage for unloading the bed of material.
4. according to the method described in claim 2, the filter cake parameter includes at least at least one of following parameter: filter cake ratio
Resistance, the compressibility of filter cake, porosity.
5. according to the method described in claim 2, determining the thickness of the media filtration layer according to the following formula:
ω1=σ1·FIt is viscous+σ2·D+σ3·P+A；
ω2=σ4·V+σ5·Res+B；
Wherein, ω1It is first thickness coefficient；
ω2It is second thickness coefficient；
FIt is viscousIt is adhesion strength between material particles；
D is material particles partial size；
P is filter cake porosity；
A is the first correction factor；
V is rotary drum revolving speed；
Res is the abrasion resistance of material particles；
B is the second correction factor；
σ1、σ2、σ3、σ4、σ5It is weight coefficient；
The thickness of the media filtration layer is directly proportional to the first thickness coefficient, is inversely proportional with the second thickness coefficient.
6. according to the method described in claim 1, the predetermined value refers to the moisture percentage for unloading the bed of material that can satisfy subsequent technique
Maximum value.
7. according to the method described in claim 1, further including disposably scraping described to unload the bed of material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811559987.5A CN109663412A (en) | 2018-12-19 | 2018-12-19 | A kind of method of centrifugal filtration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811559987.5A CN109663412A (en) | 2018-12-19 | 2018-12-19 | A kind of method of centrifugal filtration |
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| CN109663412A true CN109663412A (en) | 2019-04-23 |
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| CN201811559987.5A Pending CN109663412A (en) | 2018-12-19 | 2018-12-19 | A kind of method of centrifugal filtration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110270142A (en) * | 2019-06-09 | 2019-09-24 | 邱学尧 | Cake filtration device |
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| CN104159649A (en) * | 2012-02-06 | 2014-11-19 | 安德里兹公司 | Method for removing the precoat layer of a rotary filter |
| CN106178683A (en) * | 2016-08-31 | 2016-12-07 | 中信重工机械股份有限公司 | A kind of pre-coating filter type of disk filter |
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2018
- 2018-12-19 CN CN201811559987.5A patent/CN109663412A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104159649A (en) * | 2012-02-06 | 2014-11-19 | 安德里兹公司 | Method for removing the precoat layer of a rotary filter |
| CN106178683A (en) * | 2016-08-31 | 2016-12-07 | 中信重工机械股份有限公司 | A kind of pre-coating filter type of disk filter |
Non-Patent Citations (1)
| Title |
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| 丁启圣: "《新型实用过滤技术》", 31 July 2011, 冶金工业出版社 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110270142A (en) * | 2019-06-09 | 2019-09-24 | 邱学尧 | Cake filtration device |
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