CN101979120A - White liquor filtering device and using method - Google Patents
White liquor filtering device and using method Download PDFInfo
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- CN101979120A CN101979120A CN2010105258295A CN201010525829A CN101979120A CN 101979120 A CN101979120 A CN 101979120A CN 2010105258295 A CN2010105258295 A CN 2010105258295A CN 201010525829 A CN201010525829 A CN 201010525829A CN 101979120 A CN101979120 A CN 101979120A
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Abstract
The invention relates to a refined filtering device which is used for performing white liquor filtering in the alkali recovery treatment of papermaking waste liquor and is provided with a preceding-stage coarse filtering device in a front-section process. In the white liquor filtering device, a tubesheet for fixing a filter tube, a clear liquid area and a white liquor outlet tube which are positioned on the upper part of the tubesheet, a filtering area and an emulsion feed tube which are positioned on the lower part of the tubesheet and the middle part of the filtering device, a settlement area positioned on the lower part of the filtering area and a white mud discharging tube positioned on the lower part of the filtering device are arranged in a pressure container with a contraction section on the lower part of the pressure container, and filter cloth is arranged outside the filter tube; the clear liquid area and the filtering area are positioned in the same pressure container; and an air compression tube is arranged in the clear liquid area on the top of the pressure container, and a bounce-back liquid outlet is formed on the top of the contraction section at the bottom of the pressure container.
Description
Technical field
The present invention relates to a kind of pressure filtration device, particularly a kind ofly be used for papermaking wastewater alkali recycling and carry out that white liquid filters, be provided with the fine filtering apparatus of prime coarse filtration device in its leading portion operation.Its underpart of device of the present invention has in the pressure vessel of contraction section and is provided with: its be provided with fixing chimney filter card, the clear liquid area that is positioned at card top and white liquid drain pipe, be positioned at the card bottom and be positioned at the filtering area and the emulsion feed pipe at device middle part and the white clay discharge pipe that is positioned at the decanting zone of filtering area bottom and is positioned at the device bottom, the flange of chimney filter wherein is stuck on the card, and be fixed on the card by the presser cut that is positioned on the chimney filter flange, be outside equipped with filter cloth at chimney filter.
Background technology
The black liquor that paper-making pulping produces is one of maximum industrial pollution source, and the black liquor chemical recovery system is the most advanced, the most effective treatment technology that solves black liquor pollution, recovery resource at present, realizes energy-saving and emission-reduction, resource recycling.The purpose that black liquor alkali reclaims is the alkali (NaOH) that reclaims in the black liquor, the alkali that reclaims is to be that the form of white liquid is returned and is used in slurrying workshop section with the aqueous solution, the quality of therefore white liquid will directly influence the quality of finished product slurry, the concentration and the effective alkali content of white liquid will directly reflect alkali recovery, embody the economic benefit that alkali reclaims.And whether the index of turbidity, concentration and the effective alkali content of white liquid is advanced, depends on that fully alkali reclaims caustic room technology and equipment performance.The equipment that present stage extensively adopts is the pressure filtration device.
China's utility model patent ZL01219873.0 disclosed white liquid filter is a kind of solid-liquid separation filtration equipment of energy-efficient, advanced technology, also is the ideal product that a kind of alternative alkali reclaims caustic room white liquor clarifier and white clay washer.Except that paper industry, this product in industry such as petrochemical industry, metallurgy, light industry, food, medicine, dyestuff and Industrial Wastewater Treatment, city up and down aspect such as water treatment all will be widely used.This filter has been represented the advanced level of white liquid filtration of present causticization and white clay washing technology.This device the application of papermaking chemical recovery system can significantly reduce solid content such as calcium carbonate in the white liquid content, greatly reduce the turbidity of strong white liquor and rare white liquid, can obtain high-quality white liquid, thereby can improve the paper product quality, shorten the slurry washing time, alleviate boiling and vapo(u)rization system pipeline and equipment scaling degree, reduce the floor space and the number of devices of whole caustic room.Because this device filter effect when the filtration that is used to digest emulsion is pretty good, black liquor alkali reclaims caustic room and has obtained extensive use at home,
The related white hydraulic coupling filter of ZL01219873.0 is to be made of the vessels not under pressure that is positioned at the pressure vessel under the card and be positioned on the card, after filtering white liquid is discharged from white liquid outlet when operation, and form filter cake on the filter cloth of white clay outside chimney filter, and regularly filter cake is removed from filter cloth by the white liquid backwash of cleaning, drop to contraction section decanting zone under the pressure vessel by the gravity of filter cake again, scrape off discharge by the scraper that is provided with in it from chamber wall again.In existing treatment process,, adopted mode more, realized relevant operation by two white hydraulic coupling filter arranged in series for improving filtering accuracy.Because the influence of this apparatus structure that ZL01219873.0 is related itself, in use have the following deficiency: 1) top of this device is the non-pressure system of unenclosed construction, therefore can not bear any pressure, the time can't form effective pressure reduction in recoil, cause come off difficulty or come off not thorough of filter cake; 2) because filter cake is removed is by will white liquid after treatment introducing the clear liquid area operation that recoils, its response time is longer, adds that the influence of white fluid viscosity makes its actual poor effect; 3) whole device continuous operating time is shorter, thereby has influenced the filter efficiency of equipment; 4) need after this device work a period of time to shut down, with manually with pickle chimney filter and cover filter cloth thereon being cleaned, not only clean the cost height, labour intensity is big, and this artificial pickling service life that also can reduce filter cloth.The related device of ZL01219873.0 can't be realized filtering because the influence of structure makes, the continuous and automatic working procedure of mud extraction, cleaning, can't realize automatically working, does not therefore reach the due optimum performance of equipment.In addition, the effect of being removed filter cake by the doctor blade device of final filter in the structure of two filter arranged in series is relatively poor, and corresponding energy consumption is big.
Summary of the invention
The invention provides a kind of prior art deficiency that overcomes, can effectively remove the filter cake on the filter cloth, particularly can continuous operation, be convenient to realize the white hydraulic coupling filter of automated job.
White liquid filter of the present invention is that an its underpart has in the pressure vessel of contraction section and is provided with: it is provided with the fixedly card of chimney filter, be positioned at the clear liquid area and the white liquid drain pipe on card top, be positioned at the card bottom and be positioned at the filtering area and the emulsion feed pipe at device middle part and be positioned at the decanting zone of filtering area bottom and be positioned at the white clay discharge pipe of device bottom, the flange of chimney filter wherein is stuck on the card, and be fixed on the card by the presser cut that is positioned on the chimney filter flange, be outside equipped with filter cloth at chimney filter, clear liquid area particularly of the present invention and filtering area all are within the same pressure vessel, in the clear liquid area at the top of pressure vessel, be provided with compressed air hose, be provided with the backwash liquid liquid outlet at the contraction section top of pressure vessel bottom.Owing to all be arranged at filtering area and clear liquid area in the pressure vessel in the device of the present invention, adopt compressed air recoil the carrying out removing of filter cake simultaneously, these measures have overcome in the prior art filter pressure-bearing fully, the deficiency of recoil low-response and weak effect also can avoid filter cloth destroyed when recoil simultaneously; The white clay precipitation that is attached on the contraction section wall of pressure vessel bottom then utilizes the liquid of the backwash liquid liquid outlet ejection that is provided with through the contraction section top to wash away removing.
The backwash liquid liquid outlet that the present invention is provided with at the contraction section top of pressure vessel bottom be arranged at one with coil pipe that the backwash liquid pipe links to each other on, and be positioned at the tangential opening of contraction section cone of pressure vessel bottom, coil pipe upper edge, this structure can make the contraction section cone tangential motion of the liquid of ejection along the pressure vessel bottom, produces splendid souring.The results showed that this structure of the present invention can make attached to the precipitation on the chamber wall is removed effectively.
Filtering area and the clear liquid area of white liquid filter of the present invention in pressure vessel is respectively arranged with the filter washing water inlet, can directly carry out the pickling cleaning with cleaning in the acid solution introducing container like this; The adapter diameter of white liquid import of the present invention and purified liquor outlet is more than 3 times of caliber of the determined normal conveying liquid of charging pump flow, show through relevant test, potential difference pressure strengthens when recoil after caliber adopts aforementioned parameters, the pressure reduction formation time shortens, and can make the easier ground that comes off and come off of filter cake more thorough.These structures of the present invention can realize on-line cleaning, have improved the efficient of device simultaneously greatly.
White liquid filter of the present invention is respectively arranged with three cleaning coil pipes at the cleaning fluid that is positioned at filtering area along the position, upper, middle and lower of chimney filter length direction, each coil pipe has been disposed radially aperture in the chimney filter gap, cleaning fluid is told from aperture flow out, impact each chimney filter surface.The cleaning fluid import department that is positioned at clear liquid area is provided with impingement baffle.Owing to be provided with impingement baffle in the exit, its liquid outlet is positioned at card top, can guarantee that pickle enters in the filter ruffle gently, has avoided the corrosion of acid solution local deposits to device.
This filter of the present invention should be the fine filtering apparatus that is arranged in the filtration system, that is to say that its prime should be provided with one-level coarse filtration system, emulsion turbidity behind the prime coarse filter should be controlled at 40ppm～50ppm, can make device of the present invention that best effect is arranged like this.
Description of drawings
Accompanying drawing 1 is the general arrangement schematic of apparatus of the present invention.
Accompanying drawing 2 be filter-press in apparatus of the present invention card, filter ruffle, chimney filter and presser cut be connected the sealing means schematic diagram.
Accompanying drawing 3 sprays the schematic diagram that flows to that forms eddy flow shape liquid for the present invention offers along the recoil hatch frame of container bottom contraction section and through it on coil pipe.
Accompanying drawing 4 is the cleaning device impingement baffle schematic diagram of filter-press in apparatus of the present invention.
Accompanying drawing 5 is the cleaning disc pipe unit schematic diagram of filter-press in apparatus of the present invention.
Among the figure: the 1-charging pump; The 2-feeder channel; 3-causticization emulsion feed pipe; 4-feeder channel motor agitating device; The 5-overflow pipe that recoils; The 6-flow spill valve; 7-charging valve; The 8-electric control valve; The 9-charging is taken over; The 10-blowpipe; The 11-air door; The 12-purified liquor outlet is taken over; 13-purified liquor outlet valve; The 14-clear liquid is sent pipe; 15-clear liquid area cleaning device; 16-clear liquid area wash-out valve; 17-filtering area cleaning device; 18-filtering area wash-out valve; 19-cleans coil pipe; (after this owing to increased the cleaning coil pipe, each part sequence number all increases by one) 20-pressure vessel; 21-rotational flow flushing device; The outlet of 22-white clay; 23-cleaning fluid pipeline; 24-backwash liquid pipeline; The 25-valve that recoils; The 26-filter ruffle; The 27-chimney filter; The 28-card; 29-connects double-screw bolt; 30-attaching nut; The 31-pad; The 32-O RunddichtringO; The 33-presser cut; The 34-coil pipe that recoils; The 35-cyclone pipe; The import of 36-clear liquid area cleaning fluid; The 37-impingement baffle.
The specific embodiment
Accompanying drawing is a specific embodiment of the present invention, entire arrangement of the present invention as seen from Figure 1 is to be provided with card 28 (referring to accompanying drawing 2) in pressure vessel 20, on card 28, be fixed with chimney filter 27, the chimney filter 27 outer filter ruffles 26 that have filter cloth to make, the flange of chimney filter 27 wherein is stuck on the card 28, and be fixed on the card 28 by the presser cut 33 that is positioned on the chimney filter flange, 33 of card 28 and presser cuts be by being connected double-screw bolt 29, attaching nut 30, pad 31, and O RunddichtringO 32 is realized mutual fixing; On card top is clear liquid area, and clear liquid area is provided with white liquid drain pipe 12; The card bottom is a filtering area, and wherein, the filtering area that is positioned at the device middle part is provided with emulsion feed pipe 9, is the filter cake decanting zone at the filtering area lower area, and it is provided with white clay discharge pipe 22.Be also shown among Fig. 1, on pipe 12, connect compressed air hose 10, and pipe 10 is provided with valve 11 by a threeway.At the middle part of container 20, just be provided with filter washing water inlet pipe 17 in the filtering area in addition, the pickle of sending here from the filter washing water inlet pipe is sent to the cleaning coil pipe 19 that is positioned at position, chimney filter upper, middle and lower respectively through a threeway; Radially be provided with aperture cleaning on the coil pipe 19, cleaning fluid high velocity jet in the aperture rushes at filter ruffle 26 surfaces, can rinse well by the filter mud that it is surperficial.On the top of container, just clear liquid area is provided with cleaning fluid inlet pipe 15, is provided with impingement baffle 37 above cleaning fluid inlet pipe 15.Be respectively arranged with valve 18 and 16 at pipe 17 and pipe on 15, and manage 17 with manage 15 and all be communicated with cleaning fluid house steward 23.By causticization emulsion feed pipe 3 pending emulsion is introduced in the feeder channel 2 among the present invention, in groove 2, be provided with by motor-driven agitating device 4, under stirring, it avoid the white clay natural subsidence at feeder channel 2 bottom lands, because can carry a large amount of available bases secretly in the white clay of natural subsidence, to cause alkali to run off, reduce alkali recovery.Feeder channel 2 has bigger volume simultaneously, can store certain white liquid, for the condition that provides is provided continuously automatically.Emulsion in the groove 2 is taken over 9 by charging pump 1 through charging and is sent in the pressure vessel 20.The liquid that is used to make recoil enter pressure vessel 20 by threeway connection recoil overflow pipe 5 on pipe 9 is back in the groove 2 simultaneously.For making the device operate as normal, corresponding pipe is provided with flow spill valve 6 and charging valve 7, and electric control valve 8, and these measures make device of the present invention can carry out automatically working fully.
Workflow of the present invention is as follows: the causticization emulsion enters into feeder channel 2 from the leading portion operation, under the condition that guarantees certain displacement volume, prevents that under the stirring of feeder channel motor agitating device 4 emulsion is deposited in the feeder channel bottom.Emulsion is in charging pump 1 is delivered to the filtering area of pressure vessel 20, after filter ruffle 26 filters, enter in the chimney filter 27 and arrive the upper clear supernate district, clear liquid takes over 12 by 13 controls of purified liquor outlet valve through purified liquor outlet, by clear liquid send pipe 14 be sent to store in the clear liquid storage tank stand-by.Solid particle when filter ruffle filters in the emulsion is isolated in filter ruffle 26 outer surfaces, with the carrying out of filtering, the mud layer progressive additive of filter ruffle 26 outer surfaces, filtration resistance strengthens, the housing internal pressure raises, when reaching setup pressure value, system will close purified liquor outlet valve 13 automatically, charging pump 1 and electric control valve 8, open flow spill valve 6 simultaneously, air door 11, filter liquide refluxes to feeder channel rapidly, the moment decline of filtering area fluid pressure, compressed air is introduced in the clear liquid area simultaneously, and filter ruffle 26 inside and outside differential pressures increase, and the filter cake that is attached to filter ruffle 26 outer surfaces is come off under the differential pressure action that the liquid potential difference forms, it is clean to pass through the compressed air blowback simultaneously, falls into the decanting zone of the contraction section of pressure vessel bottom setting.Can realize automated job in the above process, for example adopt the DCS control system that corresponding valve is controlled.
After device is finished recoil, white clay sedimentation under the gravity effect, the sedimentation time, the longer the better in theory, the sedimentation time is abundant, the white clay particle in emulsion fully sedimentation enter cone segments, can according to circumstances set in actual applications.White clay is deposited in back, cone segments bottom and opens recoil valve 25, flows out rapidly along flushing liquor in the rotational flow flushing pipeline of the some of tangent to periphery direction setting in cone segments, takes filter mud out of mud mouth under gravity and kinetic energy action of inertia.The use of clean-up line makes device structure more reasonable, energy-conservation, economical.
The filtration stage of apparatus of the present invention, backwash stage, subsidence stage circulation are carried out; behind the operation some cycles; tiny particle can stop up filter ruffle, and filter efficiency obviously reduces, at this moment; close charging valve 7, purified liquor outlet valve 13 and filtration system thereof; with the filtered fluid emptying in the filter-press, open clear liquid area wash-out valve 16, filtering area wash-out valve 18, in filter-press, send into pickling; felt cover surfaces externally and internally is carried out soaking and washing, realize that on-line operation cleans.The mode speed that this mechanical movement cleans is fast, efficient is high, greatly reduces labour intensity, and filter ruffle is prolonged service life.
Claims (6)
1. white liquid filter, its underpart has in the pressure vessel of contraction section and is provided with: it is provided with the fixedly card of chimney filter, be positioned at the clear liquid area and the white liquid drain pipe on card top, be positioned at the card bottom and be positioned at the filtering area and the emulsion feed pipe at device middle part and be positioned at the decanting zone of filtering area bottom and be positioned at the white clay discharge pipe of device bottom, the flange of chimney filter wherein is stuck on the card, and be fixed on the card by the presser cut that is positioned on the chimney filter flange, be outside equipped with filter cloth at chimney filter, it is characterized in that clear liquid area and filtering area all are within the pressure vessel, in the clear liquid area at the top of pressure vessel, be provided with compressed air hose, be provided with the backwash liquid liquid outlet at the contraction section top of pressure vessel bottom.
2. a kind of white liquid filter according to claim 2, it is characterized in that the backwash liquid liquid outlet that the contraction section top of pressure vessel bottom is provided be arranged at one with coil pipe that the backwash liquid pipe links to each other on, and be positioned at the tangential opening of contraction section cone bottom the pressure vessel of coil pipe upper edge.
3. a kind of white liquid filter according to claim 2, it is characterized in that filtering area and clear liquid area in pressure vessel are respectively arranged with rinse liquid outlet, the adapter diameter of white liquid import and purified liquor outlet is more than 3 times of caliber of the determined normal conveying liquid of charging pump flow.
4. a kind of white liquid filter according to claim 3, the cleaning fluid import setting that it is characterized in that being positioned at filtering area is positioned at the position of the following pipe end that is lower than chimney filter slightly, and the cleaning fluid import department that is positioned at clear liquid area is provided with impingement baffle.
5. described any the white liquid filter of claim 1 to 4 is characterized in that also being connected in series with a white liquid filter of prime that has doctor blade system before this device.
6. use the using method of described any the white liquid filter of claim 5, it is characterized in that the emulsion turbidity that enters again in the white liquid filter is controlled at 40ppm～50ppm behind the white liquid filter of the prime that has doctor blade system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105258295A CN101979120A (en) | 2010-10-27 | 2010-10-27 | White liquor filtering device and using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105258295A CN101979120A (en) | 2010-10-27 | 2010-10-27 | White liquor filtering device and using method |
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| Publication Number | Publication Date |
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| CN101979120A true CN101979120A (en) | 2011-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010105258295A Pending CN101979120A (en) | 2010-10-27 | 2010-10-27 | White liquor filtering device and using method |
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| CN (1) | CN101979120A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104043278A (en) * | 2014-05-27 | 2014-09-17 | 株洲冶炼集团股份有限公司 | Novel automatic filtering device |
| CN104317270A (en) * | 2014-11-04 | 2015-01-28 | 中国轻工业南宁设计工程有限公司 | Automatic causticization control system |
| CN106315709A (en) * | 2016-09-21 | 2017-01-11 | 华南理工大学 | Method of purifying pulping alkali recovery white liquor and application |
| CN107875714A (en) * | 2017-12-27 | 2018-04-06 | 威孔过滤科技（苏州）有限公司 | Large Copacity Jenag strainer and its filter method |
| CN114307324A (en) * | 2021-12-08 | 2022-04-12 | 广州崧安电子科技有限公司 | Solid-liquid separation processing apparatus |
-
2010
- 2010-10-27 CN CN2010105258295A patent/CN101979120A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104043278A (en) * | 2014-05-27 | 2014-09-17 | 株洲冶炼集团股份有限公司 | Novel automatic filtering device |
| CN104317270A (en) * | 2014-11-04 | 2015-01-28 | 中国轻工业南宁设计工程有限公司 | Automatic causticization control system |
| CN106315709A (en) * | 2016-09-21 | 2017-01-11 | 华南理工大学 | Method of purifying pulping alkali recovery white liquor and application |
| CN106315709B (en) * | 2016-09-21 | 2020-02-18 | 华南理工大学 | Purification method and application of white liquor recovered from pulping alkali |
| CN107875714A (en) * | 2017-12-27 | 2018-04-06 | 威孔过滤科技（苏州）有限公司 | Large Copacity Jenag strainer and its filter method |
| CN114307324A (en) * | 2021-12-08 | 2022-04-12 | 广州崧安电子科技有限公司 | Solid-liquid separation processing apparatus |
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Application publication date: 20110223 |