CN105198037B - Based on the hydrocyclone system and the screenings separation method that inject dissolved air water formula pulp purifiation principle - Google Patents
Based on the hydrocyclone system and the screenings separation method that inject dissolved air water formula pulp purifiation principle Download PDFInfo
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Abstract
The invention discloses a kind of based on the hydrocyclone system and the screenings separation method that inject dissolved air water formula pulp purifiation principle, be by the slurry that need to purify before entering hydrocyclone, a certain proportion of supersaturation dissolved air water it is initially charged in pulp-inlet pipe road, after dissolved air water and serosity mix in the duct, the proportion of slightly soluble gas slurry system declines rapidly, and impurity proportion keeps constant, say, that increased sharply the difference in specific gravity between slightly soluble gas serosity and heavy seeds；After slightly soluble gas serosity enters hydrocyclone system, made the centrifugal force difference between serosity and impurity become big by the effect of rotating field, separate power bigger；And good slurry outlet pressure is lower than stock inlet pressure, in serosity, air starts suitably to expand, and proportion is lighter, is more beneficial for good slurry and discharges from central tube, and separation efficiency is higher.
Description
Technical field
The present invention relates to a kind of pulp purifiation separation equipment, be specifically related to a kind of based on the hydrocyclone system and the screenings separation method that inject dissolved air water formula pulp purifiation principle.
Background technology
Waste paper has accounted for China paper industry raw material more than 65%.Wastepaper pulping and papermaking is utilized to be possible not only to save a large amount of forest tree fibre resources, and beneficially energy-saving and emission-reduction.But containing heavy seeds granules such as a large amount of iron nails, glass, stones in waste paper pulp, have impact on pulp quality and the runnability of the equipment of production and life-span, it is necessary to effectively removed by cleaning equipment.
Middle HC Cleaner is used to remove the heavy seeds such as the bigger irony removed in slurry of proportion in secondary stock, sandstone, slurry group, lumps, blob of viscose, iron nail at higher concentrations.Its usual structure is formed by feeding threeway, grout outlet, big cone, housing and sediment pot etc..Slurry is entered by top charging threeway tangent line, and good slurry outlet is in top centre.Hypocone has equilibrium water import, bottom to be furnished with gate valve and sediment pot, hypocone and sediment pot to be respectively equipped with sight glass.
Its operation principle is as follows: in slurry, heavy seeds is more, utilizes slurry liquid (water+paper pulp fiber) separate impurity different from impurity proportion.Produce static natural subsidence in spreading mass purifies the stock tank being utilized in as shown in Figure 1 for paper-making industry the earliest to separate, developed in sediment ditch as shown in Figure 2 or sediment dish under with trickling form dynamically natural subsidence later and separate.
The raising required along with production scale and separation efficiency, develop into low dense straight barrel type ruffclone as shown in Figure 3, its principle is centrifugation, i.e. rotate with certain tangential velocity by after feeding threeway tangent line entrance scummer with certain pressure, due to the difference of centrifugal force, heavy seeds is thrown toward wall, under gravity, gradually run to bottom, enter sediment pot；Slurry is relatively small due to centrifugal force, gradually moves to center low-pressure area, and after arriving bottom the grout outlet of center, vortex rises, and is finally discharged by good slurry mouth.Due to inside straight barrel type ruffclone from top to bottom slurry accumulated amount constantly reduce (because part is from continuous eliminating suitable for reading), add starching stream and wall friction and linear velocity is greatly reduced, so the most down centrifugal separating effect is the poorest.
After be further development of such as hydrocyclone highly concentrated in Fig. 4, its principle is also for centrifugation, and its active section cylinder is cone.Its operation principle is as it is shown in figure 5, owing to its cone 2 has certain taper, and cone 2 is longer, and internal rotating radius is gradually reduced, and slurry stream can be avoided to reduce at rotary course medium velocity, it is ensured that centrifugal force is strengthened, thus improves purification efficiency.Equilibrium water, bottom pressure, slightly larger than slurry pressure, makes fiber can not enter the heavy seeds such as sediment pot 4, only sand grains, metallic particles, blob of viscose, plastics and sinks in tank, decrease fiber loss.During use, slurry 1 is entered high speed rotating after scummer with certain pressure by feeding threeway tangent line, and due to the difference of centrifugal force, heavy seeds is thrown toward wall, under gravity, gradually runs bottom cone 2, enters sediment pot.Fiber is less due to centrifugal force, gradually to center low-pressure area run, bottom arrival after vortex rise, finally discharged by good slurry mouth 3.
It is obvious that hydrocyclone to compare straight barrel type ruffclone more advanced, because its slurry produces friction at rotary course and barrel and makes linear velocity constantly reduce, cause centrifugation power constantly to reduce；But cylinder is taper and diameter constantly diminishes from top to bottom, therefore on-line velocity constantly reduces centrifugation under situation and tries hard to keep to hold and do not reduce.Along with development in science and technology, hydrocyclone has developed a variety of modified version, has done a lot of improvement in terms of cone angle, grout outlet (diameter, length), stock inlet size and dregs discharging valve etc..Generally, the effect of hydrocyclone is better than straight barrel type ruffclone.
Traditional type pulp purifiation sedimentation tank, sediment ditch (dish), ruffclone are primarily present following technical problem underlying and shortcoming: 1. when sedimentation tank, sediment ditch (dish) are for pulp purifiation, the former is batch production, and the latter is better than the former for producing continuously；But both are and utilize slurry liquid (water+paper pulp fiber) with the natural difference in specific gravity between impurity as separating power, and relative separation power is little, thus it is not suitable for extensive, high efficiency purification production.2. when traditional low dense straight barrel type ruffclone and hydrocyclone are for pulp purifiation, slurry centrifugal action under rotating field is relied on to make slurry, miscellaneous difference in specific gravity effect amplify, so separation power is than nature difference in specific gravity situation (i.e. sedimentation tank, sediment ditch (dish)) Shi Yao great, namely separation efficiency is more much higher than sedimentation tank, sediment ditch (dish)；On the basis of but this centrifugal action amplification slurry, miscellaneous difference in specific gravity separation power are built upon slurry, miscellaneous natural difference in specific gravity, that is as pulp, miscellaneous natural difference in specific gravity be zero time, this centrifugal force power can not play centrifugation, only when slurry, miscellaneous natural difference in specific gravity exist or be the biggest, separating power the biggest, separating effect is the best.Therefore traditional hydrocyclone system separation efficiency to depend on slurry, the natural difference in specific gravity of miscellaneous, slurry, the natural difference in specific gravity of miscellaneous become affects the key parameter that slurry impurity purifies。
Visible, design the higher scummer of a kind of separation efficiency and screenings separation method has become technical problem urgently to be resolved hurrily.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of based on the hydrocyclone system and the screenings separation method that inject dissolved air water formula pulp purifiation principle.
Technical scheme: for solving above-mentioned technical problem, the hydrocyclone system based on injection dissolved air water formula pulp purifiation principle that the present invention provides, including hydrocyclone, described hydrocyclone stock inlet is connected with pressure air-dissolving water generation system.
As preferably, being provided with pressure air-dissolving water dispenser in described stock inlet, described pressure air-dissolving water dispenser has an input and one group of scattered outfan, and described input is connected with pressure air-dissolving water delivery pipe road.
As preferably, described pressure air-dissolving water generation system includes pressure air-dissolving tank, is connected to pressure pump and the air compressor machine of pressure air-dissolving tank input, and is connected to the decompression relief valve of pressure air-dissolving tank outfan.
As preferably, inlet pressure gauge is installed at described stock inlet, at the good slurry mouth of described hydrocyclone, delivery gauge is installed.
The present invention proposes a kind of screenings separation method based on injection dissolved air water formula pulp purifiation principle simultaneously, is to be mixed into pressure air-dissolving water in the dynamic slurry entering hydrocyclone.
As preferably, described pressure air-dissolving water is to add the supersaturation dissolved air water in pulp-inlet pipe road, and described supersaturation dissolved air water mixes formation slightly soluble gas-slurry system in the duct with flowing serosity；After slightly soluble gas-slurry system enters hydrocyclone system, the centrifugal force difference between serosity and impurity is made to become big by the effect of rotating field.
Owing to the pressure ratio stock inlet pressure in good slurry exit is low, slightly soluble gas-slurry system is when flowing to pulp direction, and air therein can expand and make its proportion lighter, is more beneficial for good slurry and discharges from central tube, and separation efficiency is higher.Owing to slightly soluble gas-slurry system proportion declines rapidly, and impurity proportion keeps constant, and increased sharply the difference in specific gravity between slightly soluble gas serosity and heavy seeds, and the separation power in hydrocyclone system is bigger.
Beneficial effect: present invention production continuously instead of static Batch Process, compares existing utilization slurry, miscellaneous the static settlement separate equipment of natural difference in specific gravity, and yield is higher.
Existing vortex dregs removing from paper pulp be based on slurry, miscellaneous there is nature difference in specific gravity, recycling slurry, the miscellaneous centrifugal action produced under rotating field, increase the separation power of nature difference in specific gravity.And the technology used by the present invention is by being mixed into slightly soluble air water in the slurry that need to purify, makes the difference in specific gravity between serosity and impurity strengthen, be then combined with hydrocyclone purification techniques so that secondary stock purification efficiency is greatly promoted；If it addition, when low dense scummer, scummer import is starched dense regulation (dilute) and be need not special stock tank (groove or tank), saving conveying or the energy consumption of stirring；And the energy consumption of supersaturation dissolved air water preparation system produces pressure and can be merged into the kinetic energy that hydrocyclone import itself needs so that overall energy consumption does not increases.
At present both at home and abroad, remove the purification techniques of a large amount of heavy seeds with equipment at secondary stock, not yet retrieve the technology using similar technique principle of the present invention, increase after being i.e. uniformly blended into slightly soluble air water starch, miscellaneous difference in specific gravity, then with the document of centrifugation.
In addition to the technical characteristic solving the technical problem that, constituting technical scheme except invention described above and the advantage brought by the technical characteristic of these technical schemes, the advantage brought based on the other technologies feature injecting the hydrocyclone system of dissolved air water formula pulp purifiation principle and comprise in other technologies problem that screenings separation method can solve, technical scheme and these technical characteristics of the present invention, will be described in more detail in conjunction with accompanying drawing.
Accompanying drawing explanation
Fig. 1 is the operation principle schematic diagram that in prior art, in stock tank, static state is settlement separate；
Fig. 2 is the operation principle schematic diagram of sediment ditch or sediment dish in prior art；
Fig. 3 is the operation principle schematic diagram of the low dense straight barrel type ruffclone of tradition；
Fig. 4 is the structural representation of existing highly concentrated hydrocyclone；
Fig. 5 is the operation principle schematic diagram of Fig. 3；
Fig. 6 is the process chart of the embodiment of the present invention；
Fig. 7 is the structural representation of hydrocyclone in Fig. 6；
Fig. 8 is the operation principle schematic diagram of Fig. 7；
Fig. 9 is heavy seeds separation efficiency and " slurry-water-slightly soluble gas " system proportion relation curve in embodiment；
In figure: slurry 1, cone 2, good slurry mouth 3, sediment pot 4, pressure air-dissolving water inlet 5, pressure solution air water allotter 6, pressure pump 7, air compressor machine 8, dissolving 9, remove the gred pump 10, hydrocyclone 11.
Detailed description of the invention
Embodiment:
The hydrocyclone system based on injection dissolved air water formula pulp purifiation principle of the present embodiment as shown in Figure 6, is purification work system in figure in left wire frame in producing system, right frame for supersaturation dissolved air water.This technological process and traditional pulp purifiation flow process differ primarily in that: intubate plus one on the pipeline between before the pump stock inlet that extremely removes the gred after the pump discharge valve that removes the gred in traditional flow process, this intubates the dissolved air water generation system coming from left side, that is adds a dissolved air water generation system in HC Cleaner system.Basic craft course is: in the dissolved air water generation system of left side, in dissolving 9, injected certain pressure and the water of flow, compressed air by pressure pump 7, air compressor machine 8 respectively, thus in dissolving 9, generate the supersaturation dissolved air water (leading indicator is water and the air ratio dissolved in, pressure, flow) of certain gas-water ratio, certain pressure and flow；Then discharging pressure air-dissolving water by the decompression relief valve bottom dissolving 9 in slagging-off pump 10 exit, hydrocyclone 11 pulp-inlet pipe, this dissolved air water disperses to be mixed in serosity in pipe；Simultaneously because slightly reducing pressure, in dissolved air water, the molten gas of part becomes small slightly soluble bubble (leading indicator is slightly soluble bubble diameter, quantity and distribution consistency degree), enter and closing, hydrocyclone 11 are formed dynamically stream, gap between the proportion of slightly soluble gas serosity system and heavy seeds is made to expand rapidly than during without dissolved air water situation, under the centrifugal action of rotating field, heavy seeds separation efficiency (depends on " ρMiscellaneous/ρSerosity", ρ is proportion) it is greatly improved；Along with slightly soluble gas serosity is threaded to center to grout outlet, pressure reduces pressure (by controlling grout outlet valve) further, and its proportion declines further, causes rising pulp stream in central canal and is easier to；When slightly soluble gas serosity discharge outlet pipeline enters next stock tank (groove, tank), being now atmospheric pressure state, slightly soluble air rapidly be release, does not affect any characteristic of original slurry material system.
As it is shown in fig. 7, purifying work system is to increase pressure air-dissolving water inlet 5 and pressure solution air water allotter 6 at the stock inlet of existing HC Cleaner, inlet pressure gauge is installed at stock inlet, goes out delivery gauge is installed at good slurry mouth 3.
As shown in Figure 8, slurry 1 is when inputting HC Cleaner, at pressure air-dissolving water inlet 5, the pressure air-dissolving water with the input of pressure solution air water allotter 6 is mixed and fed into cone 2, the immiscible material entirety proportion formed decreases than slurry before, and owing to being dynamically flowing, layering will not be produced, the difference in specific gravity of slurry and wherein impurity is expanded on the premise of not changing slurry properties, improve the efficiency of magazins' layout, heavy impurity after separation enters sediment pot 4, good slurry from upper end good slurry mouth 3 discharge.
The process key core principle of the present invention: be by the slurry that need to purify before entering hydrocyclone, a certain proportion of supersaturation dissolved air water it is initially charged in pulp-inlet pipe road, after dissolved air water and serosity mix in the duct, the proportion of slightly soluble gas-slurry system declines rapidly, and impurity proportion keeps constant, say, that increased sharply the difference in specific gravity between slightly soluble gas serosity and heavy seeds；After slightly soluble gas serosity enters hydrocyclone system, made the centrifugal force difference between serosity and impurity become big by the effect of rotating field, separate power bigger；And good slurry outlet pressure is lower than stock inlet pressure, in serosity, air starts suitably to expand, and proportion is lighter, is more beneficial for good slurry and discharges from central tube, and separation efficiency is higher.
1, system state data and the Theoretical Calculation of separating effect
1.5%～3.5% slurry proportion is 1.05～1.1g/cm3, when being mixed into supersaturation dissolved air water (WGR is 1:0.45), slightly soluble gas slurry specific gravity is about 0.735.In waste paper impurity, content shared by gravel and glass is more, and mean specific gravity is 2.5g/cm3, impurity and slurry be suffered centrifugal force (F in scummern):
Fn=ρV·ν2/R
ρ proportion,VVolume,νParticle linear velocity,RMoving radius.The impurity of unit volume and slurry are on same position, and centrifugal force is directly proportional to proportion, if K=V is ν2/ R, is mixed into the forward and backward slurry of dissolved air water, miscellaneous centrifugal force difference is respectively 1.42K, 1.77K in slurry, namely separates power and add 21.93%.
2, test and analyze
(1) experiment and analysis principle
1. secondary stock concentration is proportion ρ when 1.5%～3.5%Slurry 0It is 1.05～1.1 g/cm3；In waste paper impurity, content shared by gravel and glass is more, mean specific gravity ρMiscellaneousFor 2.5g/cm3。
2. owing in generally during the work of highly concentrated hydrocyclone, wherein serosity is in closings, flowing full and dynamic flow regime, and the air capacity that relatively can be uniformly blended into (exceeding well over air dissolubility) is more.
3. by contrived experiment, as long as recording pressure is 3 × 105
This value of Pa(be common in the operating pressure of HC Cleaner) time the air capacity that is mixed into greatest extent, be derived from injecting the minimum proportion ρ of " slurry-water-slightly soluble gas " mixed system after air(slurry gas min )。
4. purification process starches miscellaneous separation efficiency and " ρMiscellaneous/ρSlurry" ratio relevant, so, by comparing " ρMiscellaneous/ρSlurry 0" and " ρMiscellaneous/ρ( Slurry gas min )" would know that and inject the improvement of centrifugal clarification separation efficiency before and after air.
(2) experimentation
1. at airtight clear glass pressure vessel, (this experiment uses clear glass stress reaction axe, and volume is VContainerIn), put into certain liquid level H0, concentration be 1%, 1.5%, 2% secondary stock (proportion is 1.05～1.1, and volume is V0 Slurry).
2. the most continuous injecting compressed air is (from air compressor machine, equipped with air mass flow Table VGas), reactor agitator quickly stir the air ensureing to add and pulp level mixing；Along with being passed through the increase of air capacity in slurry, the continuous lifting in serosity position in axe, in axe, above serosity, gas-phase space constantly reduces, and the proportion of " slurry-water-slightly soluble gas " mixed system constantly declines；It is continuously increased and is passed through air capacity in slurry, when reactor container pressure P is risen most 3 × 10 by normal pressure5
During Pa, stop injecting air, illustrate the most to reach 3 × 105
Made air be in slightly soluble state by reactor stirring under Pa pressure condition, become " slurry-water-slightly soluble gas " mix homogeneously state.
3. by calculating 3 × 105Gas-phase space volume and total air capacity injected above the volume of " slurry-water-slightly soluble gas ", serosity during Pa, conversion obtains minimum proportion ρ( Slurry gas min )；Calculate again, draw out " ρMiscellaneous/ρSlurry—ρSlurry" relation curve is shown in Fig. 9, it can be seen that the change of separation efficiency.
(3) remove the gred efficiency analysis
Generally, dense ability is starched in the process 1.5%～3.5% of highly concentrated hydrocyclone in one is 80～450m3/ h, selection 250 m calculated below3/ h is foundation.
1. dissolved air water system
When temperature is room temperature, pressure (Pwa) it is 6 × 105
Pa～7 × 105
Pa, crossing Underwater sound field (WGR) in dissolved air water is 1:0.40～1:0.55；Serve as dissolved air water pressure for being reduced to 3 × 105Pa～3.5 × 105Pa(scummer inlet pressure) time, mix the supersaturation dissolved air water flow-control into scummer pulp-inlet pipe system at (Qwa) it is 190～240m3/h。
2. hydrocyclone system
Go out to remove the gred pump slurry concentration (Cb) be 4.5%～5.5%(to change according to the change entering to starch concentration), the pump that goes out to remove the gred slurry proportion (ρb) it is 1.10～about 1.18, the pump that goes out to remove the gred slurry flow (Qb) 68～85m3/h；Hydrocyclone stock inlet pressure (P in) 3 × 105Pa～3.5 × 105Pa, grout outlet pressure (Pout) 3 × 104Pa～3.5 × 104Pa, inlet outlet pressure differential (△ Pio) about 2.7 × 105Pa；Hydrocyclone stock inlet slurry concentration (weight concentration Cin) 1.5%～2.0%, working slurry concentration (C in scummersepr) 1.5%～2.0%.
3. remove the gred efficiency
When purifying for the secondary stock containing a large amount of heavy seeds, starching dense is in 1.5%～3.5% under highly concentrated working concentration, and in scummer, duty slightly soluble gas slurry specific gravity is up to (ρSlurry gas min) 0.735, slurry, miscellaneous difference in specific gravity increase by 21.93%, the efficiency that removes the gred generally " ρMiscellaneous/ρSerosity" improve 42.86%.
Above in association with accompanying drawing, embodiments of the present invention are described in detail, but the present invention is not limited to described embodiment.For those of ordinary skill in the art, in the range of the principle and technological thought of the present invention, these embodiments are carried out multiple change, revises, replace and deformation still falls within protection scope of the present invention.
Claims (5)
1. a screenings separation method based on injection dissolved air water formula pulp purifiation principle, it is characterised in that: being mixed into supersaturation dissolved air water in the dynamic slurry entering hydrocyclone and reduce pressure, in dissolved air water, the molten gas of part becomes small slightly soluble bubble,Form slightly soluble gas-slurry system with the mixing of the water in slurry, paper pulp fiber and heavy seeds granule, make the difference in specific gravity between serosity and impurity strengthen；After slightly soluble gas-slurry system enters hydrocyclone system, acted on by rotating field, make paper pulp fiber and heavy seeds intergranular centrifugal force difference in serosity become big；Pressure air-dissolving water is to add the supersaturation dissolved air water in pulp-inlet pipe road, and described supersaturation dissolved air water mixes in pulp-inlet pipe road in proportion with the serosity that flows, and the water-gas of supersaturation dissolved air water ratio is for 1:0.45, and slightly soluble gas slurry specific gravity is 0.735.
2. a hydrocyclone system based on injection dissolved air water formula pulp purifiation principle, including for separating pulp fiber and the hydrocyclone of heavy seeds granule, it is characterized in that: described hydrocyclone stock inlet is connected with pressure air-dissolving water generation system, hydrocyclone good slurry outlet pressure is lower than stock inlet pressure, the pressure crossing dissolved air water is consistent at the pressure of hydrocyclone import department with slurry, water-the gas of supersaturation dissolved air water is than for 1:0.45, and slightly soluble gas slurry specific gravity is 0.735.
The most according to claim 2 based on the hydrocyclone system injecting dissolved air water formula pulp purifiation principle, it is characterized in that: pressure air-dissolving water dispenser is installed in described stock inlet, described pressure air-dissolving water dispenser has an input and one group of scattered outfan, and described input is connected with pressure air-dissolving water delivery pipe road.
The most according to claim 2 based on the hydrocyclone system injecting dissolved air water formula pulp purifiation principle, it is characterized in that: described pressure air-dissolving water generation system includes pressure air-dissolving tank, it is connected to pressure pump and the air compressor machine of pressure air-dissolving tank input, and is connected to the decompression relief valve of pressure air-dissolving tank outfan.
It is the most according to claim 2 based on the hydrocyclone system injecting dissolved air water formula pulp purifiation principle, it is characterised in that: inlet pressure gauge is installed at described stock inlet, at the good slurry mouth of described hydrocyclone, delivery gauge is installed.
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| EP0089128B1 (en) * | 1982-03-12 | 1986-05-07 | Imperial Chemical Industries Plc | Process for displacing dissolved gas from water |
| CN2053625U (en) * | 1989-05-11 | 1990-02-28 | 钟华 | Multifunction water purifying device |
| CN103352390A (en) * | 2013-06-17 | 2013-10-16 | 如东县海宇纤维制品有限公司 | High-concentration slag separator |
| CN204058134U (en) * | 2014-09-17 | 2014-12-31 | 诸城市宏利圣得环境科技有限公司 | High-performance air-dissolving apparatus |
| CN104452403A (en) * | 2014-12-05 | 2015-03-25 | 南京林业大学 | Novel guide type high-concentration conical slag remover |
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| CN105198037A (en) | 2015-12-30 |
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