CN204745702U - A film evaporator for cellulose dissolves - Google Patents
A film evaporator for cellulose dissolves Download PDFInfo
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- CN204745702U CN204745702U CN201520279170.8U CN201520279170U CN204745702U CN 204745702 U CN204745702 U CN 204745702U CN 201520279170 U CN201520279170 U CN 201520279170U CN 204745702 U CN204745702 U CN 204745702U
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Abstract
The utility model relates to a film evaporator for cellulose dissolves, film evaporator includes a cavity, and one sets up rotatable cylindricality rotor in the cavity, one or multiseriate along the scraper blade of axis direction setting in the rotor periphery, the scraper blade includes the scraper blade of vertical setting and the scraper blade of slope setting, scraper blade that the slope set up includes to become the scraper blade of negative angle degree and become the scraper blade of positive angle with vertical orientation with vertical orientation. The scraper blade that becomes the negative angle degree with vertical direction provides a demix effect to the material dissolving the in -process, the solvability that has effectively improved film evaporator unit area with dissolve the homogeneity. And owing to dissolve the improvement of efficiency, in the aspect of the selection of process consideration, can the certain degree use lower solution temperature and vacuum to reduced the risk that the material decomposes, this is more favourable to the safety in production.
Description
Technical field
The production application equipment of the Lyocell fiber of solvent that what the utility model related to a kind of applicable industrialization with NMMO is, especially a kind of thin film evaporator for cellulose dissolution.
Background technology
Cellulose dissolution is formed cellulose solution in solvent, then solution spinning in spinning-drawing machine is obtained fiber, fiber under stretching action in coagulating bath solidification forming, formed cellulose fibre.This fiber is called " solution spins cellulose fibre ", and its Typical Representative is viscose rayon.But the production process of viscose rayon exists huge pollution to atmospheric environment, energy consumption is high, waste gas wastewater discharge large, and be unfavorable for the protection of ecological environment, lasting extensive development is subject to further restriction.
The production method that one spins cellulose fibre with the solution that organic solvent NMMO (N-methylmorpholine-N-oxide) and water are solvent in recent years receives increasing concern, the fiber that this method is produced is called as Lyocell fiber, all discloses in US Patent No. 4246221 and Chinese patent CN94190487.3.The chemical constitution of Lyocell fiber is substantially identical with viscose rayon, except the characteristic with natural fiber as hygroscopicity, gas permeability, comfortableness, glossiness, except dyeability and biodegradable, can also have the advantage of the high strength of synthetic fibers.Compare other solution and spin cellulose fibre, the advantages such as production procedure is short, energy consumption is low, environmental pollution is little, the recyclable recycling of solvent that it has, it is expected to replace traditional viscose rayon, is called as 21 century green fiber.
In the industrialization of Lyocell fiber one of committed step be cellulose, NMMO, aqueous mixtures material continuous uniform dissolve and export, some companies employ a kind of thin film evaporation treatment facility and complete this step.This equipment is disclose in the patent of CN101636416, CN101711182, CN1169150 etc. in the patent No., and to the blade structure used in equipment, apparatus-form, function etc. describe.In the Lyocell fiber course of dissolution of large production capacity, in the dewatering efficiency of thin film evaporator and unit are, solvability decides the production capacity of production line, the temperature conditions that thin film evaporator uses and time of staying of material decide the security of production line, these 2 designs depending on scraper plate, arrangement mode and dissolution process.
In CN101711182, the film processing device of industrialized scale is improved, especially flight portion.This equipment de-sign vertical direction and to be greater than two kinds of scraper plates of 0 ° towards vertical direction angle, although this design can increase production capacity, but also exist film surface upgrade slow, amplitude is little, upgrade that the degree of depth is slightly shallow, do not have mixed effect to material in course of dissolution, may cause and dissolve the problems such as uneven.Just need to use very high solution temperature and comparatively harsh vacuum condition to overcome these shortcomings, this not only causes the high flow rate of energy, and higher solution temperature may cause NMMO and cellulosic decomposition, brings potential safety hazard for producing.
Given this utility model is proposed.
Utility model content
The purpose of this utility model is for overcoming the deficiencies in the prior art, a kind of thin film evaporator for cellulose dissolution is provided, effective raising film surface renewal speed and amplitude, increase film surface and upgrade the degree of depth, and a kind of anti-mixed effect is provided to material in course of dissolution, effectively improve solvability and the dissolution evenness of thin film evaporator unit are.
In order to realize this object, the utility model adopts following technical scheme: a kind of thin film evaporator for cellulose dissolution, described thin film evaporator comprises a chamber, one is arranged on rotatable cylindrical rotors in chamber, one row or multiple row are arranged on the scraper plate of rotor outer periphery in the axial direction, described scraper plate comprises the scraper plate vertically arranged and the scraper plate be obliquely installed, described in the scraper plate that is obliquely installed comprise the scraper plate in vertical direction with negative angle and the scraper plate in vertical direction with positive-angle.
The scraper plate of described one-tenth positive-angle is the scraper plate along being obliquely installed counterclockwise, and the scraper plate of described one-tenth negative angle is the scraper plate along being obliquely installed clockwise.
The scraper plate of described vertical setting and the scraper plate interval be obliquely installed are arranged, and the angle of inclination of described adjacent two row scraper plates is different.
Often row scraper plate comprises multiple spaced scraper plate vertically, and adjacent two row scraper plates are crisscross arranged.
Row in described scraper plate or several row scraper plate are the scraper plate of negative angle from top to bottom.
Row in described scraper plate or several row scraper plate part scraper plate are from top to bottom the scraper plate of negative angle, and the row in preferred described scraper plate or the latter half of several row scraper plate are the scraper plate of negative angle.
The scraper plate of described one-tenth negative angle, its columns is 2 to 8 row, preferably 2 to 4 row.
The scraper plate of described one-tenth negative angle and vertical direction angulation are α, and described α is-40 ° ~ 0 °, and preferred α is-20 ~-2 °, and more preferably α is-10 ~-3 °.
Described scraper plate end is flute profile, and between the length of tooth and adjacent teeth, the ratio in gap is less than 2:1, is preferably less than 1.8:1, is more preferably less than 1.5:1, and the length of preferred tooth is less than 40mm, preferably 10 ~ 35mm, more preferably 15 ~ 30mm.
The end of described scraper plate is provided with the knifing section of arc, and the arc length of arc knifing section is 5 ~ 400mm, preferably 20 ~ 200mm, and knifing section end-to-end distance scrapping off film evaporator inner wall distance is less than 10mm, preferably 2 ~ 5mm.
Described cavity bottom arranges a cone section, and described cone Duan Houzai establishes a straight section, is provided with discharging spiral in described cone section and straight section, and cone section part helix flight pitch is greater than straight part screw spacing.
After adopting technical scheme described in the utility model, bring following beneficial effect:
1, the scraper plate in vertical direction with negative angle described in the utility model effectively improves film surface renewal speed and amplitude, add film surface and upgrade the degree of depth, and a kind of anti-mixed effect is provided to material in course of dissolution, effectively improve solvability and the dissolution evenness of thin film evaporator unit are.And due to the raising of dissolved efficiency, in the selection of process conditions, can to a certain degree use lower solution temperature and vacuum, thus reduce the risk of material decomposition, this to safety in production advantageously.
2, the scraper plate in vertical direction with negative angle described in the utility model plays certain resistance upwards to the material flowed downward at inwall, and this resistance can have the effect of certain back mixing to material, thus impel material to have larger renovation amplitude, this effect makes the material of film forming surface mix and upgrade just, realizes rapid solution.The scraper plate vertically arranged and becomes the scraper plate of positive-angle auxiliary under, the design of the scraper plate of this one-tenth negative angle can improve material surface renewal frequency and renewal degree greatly, and the increase renewal degree of depth, is easier to realize cellulose dissolution.And it is certain in inlet amount, under the certain condition of scraper plate and inwall gap, the time of staying of material in thin film evaporator can't because of have into negative angle scraper plate resistance and increase, so the existence of the scraper plate of this one-tenth negative angle, effectively can improve the meltage of unit are inner cellulose, thus greatly improve the production capacity of thin film evaporator in cellulose dissolution.
3, the design of the scraper plate in vertical direction with negative angle described in the utility model plays certain back mixing effect to the material in course of dissolution, the dissolving that this effect can avoid the inhomogeneities of cellulose family natural polymer to cause is uneven, thus making the solubilize of formation thoroughly homogeneous, this advantage is of crucial importance on the production line of industrialization.This can reduce in solution filter progress, owing to dissolving the phenomenons such as uneven or filter net jam that is that thoroughly do not cause, also can increase filter screen service time, reduce the phenomenon such as material waste, solvent loss caused in draping process, be beneficial to raising solvent recovering rate.
4, when discharging spiral described in the utility model is together with rotor turns, the cellulose solution that thickness is difficult to flow successfully can enter spiral part fast and be subject to downward thrust, makes the material discharge thin film evaporator in time, rapidly, continuously of dissolving.
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in further detail.
Accompanying drawing explanation
Fig. 1: Film evaporator structure schematic diagram described in the utility model
Fig. 2: thin film evaporator working portion structural representation described in the utility model
Fig. 3: thin film evaporator discharging structure schematic diagram described in the utility model
Fig. 4: thin film evaporator knifing segment structure schematic diagram described in the utility model
Fig. 5: thin film evaporator knifing section end structure schematic diagram described in the utility model
Fig. 6: thin film evaporator knifing section end structure schematic diagram described in the utility model
Fig. 7: thin film evaporator knifing section end structure schematic diagram described in the utility model
Wherein: 1, chamber, 2, scraper plate, 3, tooth, 4, rotor, 5, motor, 6, charging aperture, 7, cloth section, 8, vacuum orifice, 9, the section of vacuumizing, 10, bottom cone section, 11, cone section discharging spiral, 12, bottom straight section, 13, straight section discharging spiral.21, the scraper plate vertically arranged, 22, become the scraper plate of positive-angle, 23, become the scraper plate of negative angle.
Detailed description of the invention
As shown in Figure 1, Figure 2, Figure 3 shows, a kind of thin film evaporator for cellulose dissolution described in the utility model, described thin film evaporator comprises a chamber 1, one is arranged on rotatable cylindrical rotors 4 in chamber 1, one row or multiple row are arranged on the scraper plate 2 of rotor 4 periphery in the axial direction, described scraper plate 2 comprises the scraper plate 21 vertically arranged and the scraper plate be obliquely installed, described in the scraper plate that is obliquely installed comprise the scraper plate 23 in vertical direction with negative angle and the scraper plate 22 in vertical direction with positive-angle.The described scraper plate 23 in vertical direction with negative angle effectively improves film surface renewal speed and amplitude, add film surface and upgrade the degree of depth, and a kind of anti-mixed effect is provided to material in course of dissolution, effectively improve solvability and the dissolution evenness of thin film evaporator unit are.And due to the raising of dissolved efficiency, in the selection of process conditions, can to a certain degree use lower solution temperature and vacuum, thus reduce the risk of material decomposition, this to safety in production advantageously.
Utilizing the scraper plate 2 on rotor 4 cellulose mixtures entered in thin film evaporator to be scraped to prolong into can toward the film of current downflow.Along with the rotation of scraper plate 2, the surface of film is constantly scraped prolongs, thus the material on surface constantly upgrades, and the material of the scraper plate be obliquely installed to film forming applies certain thrust, it is made to move at inwall, this process coordinates suitable temperature and vacuum condition, can realize material and dissolve continuously, fast in thin film evaporator.And be equipped with one section of discharging spiral again at thin film evaporator outlet at bottom end, the discharging of the material continous-stable dissolved can be realized and be delivered to follow-up workshop section.
In scraper plate 2, there is a kind of scraper plate 21 of vertical setting, equal 0 ° with vertical direction angulation.This scraper plate can upgrade film surface after rotating fast, impels cellulose substances to dissolve more fully.This scraper plate due to the flow direction that rotation direction and material are totally downward vertical, and compare inclination scraper plate its to scrape membrane area larger, so the resistance produced in rotating is larger, especially thin film evaporator load can be increased when high-viscosity material and large production capacity dissolve, so the scraper plate columns of this vertical setting accounts for 1/2 or following of the total columns of thin film evaporator scraper plate.
In scraper plate 2, the scraper plate be obliquely installed in addition, described in the scraper plate that is obliquely installed comprise the scraper plate 23 in vertical direction with negative angle and the scraper plate 22 in vertical direction with positive-angle.In vertical direction with the scraper plate 22 of positive-angle except playing knifing and Surface Renewal effect, because it has certain forward angle, after rotation, there is downward thrust to material, make the material of film forming be easier to flow downward on inwall.The angle [alpha] OK range of this scraper plate and rotor direction is 0 ~ 45 °, preferably 5 ~ 25 °.
In scraper plate 2, the scraper plate be obliquely installed in addition, described in the scraper plate that is obliquely installed comprise the scraper plate 23 in vertical direction with negative angle and the scraper plate 22 in vertical direction with positive-angle.In vertical direction with the scraper plate 23 of negative angle except playing knifing and Surface Renewal effect, also certain resistance is upwards played to the material flowed downward at inwall, and this resistance can have the effect of certain back mixing to material, thus impel material to have larger renovation amplitude, this effect makes the material of film forming surface mix and upgrade just, realizes rapid solution.The scraper plate vertically arranged and becomes the scraper plate of positive-angle auxiliary under, the design of the scraper plate of this one-tenth negative angle can improve material surface renewal frequency and renewal degree greatly, and the increase renewal degree of depth, is easier to realize cellulose dissolution.And it is certain in inlet amount, under the certain condition of scraper plate and inwall gap, the time of staying of material in thin film evaporator can't because of have into negative angle scraper plate resistance and increase, so the existence of the scraper plate of this one-tenth negative angle, effectively can improve the meltage of unit are inner cellulose, thus greatly improve the production capacity of thin film evaporator in cellulose dissolution.The scraper plate of described one-tenth negative angle and vertical direction angulation are α, and described α is-40 ° ~ 0 °, and preferred α is-20 ~-2 °, and more preferably α is-10 ~-3 °.
For this kind of natural polymer of cellulose, inherently there is the inhomogeneities of the aspect such as molecular weight, molecular structure, and this inhomogeneities also result in the inhomogeneities of the cellulose solution formed in course of dissolution.The design of the scraper plate of negative angle is become to play certain back mixing effect to the material in course of dissolution in the utility model, the dissolving that this effect can avoid the inhomogeneities of cellulose family natural polymer to cause is uneven, thus making the solubilize of formation thoroughly homogeneous, this advantage is of crucial importance on the production line of industrialization.This can reduce in solution filter progress, owing to dissolving the phenomenons such as uneven or filter net jam that is that thoroughly do not cause, also can increase filter screen service time, reduce the phenomenon such as material waste, solvent loss caused in draping process, be beneficial to raising solvent recovering rate.
And the scraper plate of this one-tenth negative angle is to the help of dissolved efficiency, thin film evaporator can be made to reduce solution temperature and vacuum level requirements when Selective dissolution condition, and this will be especially benefited in the production of large production capacity.Because the reduction of solution temperature, the decomposition risk of cellulose substances can be greatly reduced, ensure production safety.The reduction of vacuum condition, can reduce the live load of vacuum pump set, reduces energy consumption, cost-saving.
The scraper plate 23 of this one-tenth negative angle, because it has upwards resistance and back mixing effect to the material flowed downward, certain torsion will additionally be increased when scraper plate will be caused to rotate, disadvantageous in this selection at power of motor and power consumption, so this scraper plate should be minimum in all scraper plate quantity, suitable scraper plate columns is 2 ~ 6 row, preferably 2 to 4 row.
The scraper plate 22 of described one-tenth positive-angle is the scraper plate along being obliquely installed counterclockwise, and the scraper plate of described one-tenth negative angle is the scraper plate along being obliquely installed clockwise.
Described adjacent two row scraper plates angle of inclination different.Have enough thrust to produce flowing and Surface Renewal for ensureing that material is effectively scraped and prolonging film forming and material, scraper plate arrangement is the mode that scraper plate that the scraper plate that vertically arranges of row and row are obliquely installed is intervally arranged, and adjacent two row scraper plate directions can not be identical.And for ensureing that various scraper plate is to the uniformity of material effect, often row scraper plate comprises multiple spaced scraper plate vertically, and adjacent two row scraper plates are crisscross arranged.Avoid producing scraper plate and scrape phenomenon less than material, adjacent two row scraper plate height infraversion malpositions arrangements, scrape face not on the same face.
Row in described scraper plate or several row scraper plate are the scraper plate of negative angle from top to bottom, or the row in described scraper plate or several row scraper plate part scraper plate are from top to bottom the scraper plate of negative angle, the row in preferred described scraper plate or several row scraper plate the latter half are from top to bottom the scraper plate of negative angle.Comparatively preferred arrangement mode is that the scraper plate becoming negative angle to tilt only is arranged in a part for these row, and not permutation is all into the scraper plate of negative angle, and other part scraper plates of these row are into the scraper plate that positive-angle tilts.More preferred arrangement mode is into the scraper plate that negative angle tilts and is only arranged in the latter halfs of this row.Because be in the cellulose mixtures in thin film evaporator, under higher temperature and vacuum condition, once be paved into uniform film, can realize immediately dissolving, add scraper plate to scrape to prolong film surface is constantly upgraded, the first half of thin film evaporator is cellulose rapid solution section.Most cellulose substances can realize dissolving at upper semisection, but moieties amount cellulose that is high, narrow molecular weight distribution is difficult to rapid solution, and this not consoluet cellulose can be wrapped in the cellulose solution dissolved.If lower semisection is distributed with into the scraper plate of negative angle, the back mixing of this scraper plate and significantly renovate effect, can impel do not dissolve cellulose substances mixing completely, upgrade, mobile, dehydration dissolves.
The scraper plate of described one-tenth negative angle, its columns is 2 to 8 row, preferably 2 to 4 row.When cellulose percentage composition is less than 13%, or when separate unit thin film evaporator dissolving production capacity is less than 250,000 tons/year, the scraper plate that scraper plate distribution form is into negative angle inclination is only distributed in the latter half, and is 2 ~ 4 row.When cellulose percentage composition is greater than 13%, or when separate unit thin film evaporator dissolving production capacity is greater than 250,000 tons/year, for realizing cellulosic abundant dissolving, preferably use permutation to be into the scraper plate arrangement form of negative angle, suitable columns is 2 ~ 6 row.
Described scraper plate end is flute profile, compared to there is no the scraper plate that the end of tooth is more flat, when this profile of tooth scraper plate can reduce rotor turns, material is to the resistance of scraper plate, simultaneously because scraper plate is multiple row distribution, and misplaces up and down, scrape face not on the same face, do not have material scraper less than phenomenon, so not only ensure that knifing effect, can also effectively reduce motor run time consume power, reduce the vibrations produced when film machine runs, and effectively reduce energy consumption.
As shown in Figure 4, between the length of tooth 3 and adjacent teeth, the ratio in gap is less than 2:1, preferably be less than 1.8:1, be more preferably less than 1.5:1, such distribution adds the quantity of tooth on every block scraper plate, makes the laminating of tooth and inwall more closely knit, effectively can improve and scrape membrane efficiency, to material Surface Renewal, improve rate of dissolution and dissolution evenness all helpful.
The length of preferred tooth is less than 40mm, preferably 10 ~ 35mm, more preferably 15 ~ 30mm.
As shown in Fig. 5, Fig. 6, Fig. 7, the end of described scraper plate is provided with the knifing section of arc, the arc length of arc knifing section is 5 ~ 400mm, preferably 20 ~ 200mm, in scraper plate rotation process, is scraping on edges of boards for preventing solid accumulation, fail timely plastic film mulch on thin film evaporator inwall, the knifing section of scraper plate is curved, and this arc scraper plate makes material have a transitional function when knifing, progressively forms film by bulk.More preferred scheme is, scraper plate is not straight in knifing section, but in certain bent angle, makes the face of scraping of scraper plate form larger cambered surface, be more conducive to the shaping of film like this.
Knifing section end-to-end distance scrapping off film evaporator inner wall distance is less than 10mm, preferably 2 ~ 5mm.The knifing section end of scraper plate and the spacing of thin film evaporator inwall can not be excessive, and necessary uniformity, suitable spacing should be less than 10mm, preferably 2 ~ 5mm.Because excessive spacing makes the film thickness of formation large, flow difficulties, Surface Renewal is slow, dissolves uneven, not thorough; And pitch requirements too small in process the more difficult uniformity that realizes, also be difficult to ensure precision in installation process, the thin film evaporator of especially larger disengagement area, rigidity is fixed scraper plate and inherently be there is certain morphotropism, the too small meeting of pitch requirements makes processing difficulties, precision is difficult to ensure, and brings the problems such as equipment cost increase.
Described cavity bottom arrange one bottom the section of cone 10, straight section 12 bottom establishing again after the cone section 10 of described bottom, is provided with discharging spiral in described bottom cone section 10 and bottom straight section 12.Under cellulose solution after dissolving is greater than the inclination scraper plate of 0 ° thrust in angle [alpha] and Action of Gravity Field, flow to bottom thin film evaporator.Bottom is tapered, and is provided with a discharging opening.But in industrialization is produced, because content of cellulose in cellulose solution is high, output large, solution viscosity is large, flowing is slow, so be difficult to timely outflow to the solution of the bottom section of cone, causes the phenomenons such as discharging difficulty, solution accumulation, liquid level rise.The utility model provides a kind of method of quickly discharging, bores Duan Houzai and establish a straight section bottom thin film evaporator, and cone section bottom and join one section of discharging spiral in straight section, wherein the length of straight section is 50 ~ 700mm.Discharging spiral is connected with thin film evaporator internal rotor, and when rotor turns, spiral together rotates, and providing great thrust, making the material of dissolving discharge thin film evaporator quickly for flowing into spiral part solution.Be subject to downward thrust for making the cellulose solution of thickness successfully can enter spiral part fast, spiral from the lower semisection of cone section namely extend to straight section bottom discharge mouth.The flight pitch of cone section discharging spiral 11 is comparatively large, and material easily flows into, thus makes inflow bore the material of section spiral under helical rotation and downward thrust, is pushed into straight part spiral sooner.The flight pitch of straight section discharging spiral 13 is smaller, and the diameter of straight part is less than cone section part, so straight section spiral is larger to the thrust that material is downward, thus the material entering straight part is more easily discharged downwards.Under the thrust that two sections of spirals are jointly downward, the material that thickness is difficult to flow also can realize discharging rapidly, continuously.
For meeting discharging demand, the resistance produced when simultaneously reducing helical rotation is to the requirement of energy consumption, and thin film evaporator bottom discharge spiral total length H is 200 ~ 800mm, preferably 300 ~ 600mm.Wherein the screw spacing of the section of cone is bigger, and suitable scope is 50 ~ 150mm, and straight section helix pitch is smaller, and suitable scope is 30 ~ 100mm.
In industrialization is produced, effective disengagement area of thin film evaporator is larger, and scraper plate is more, and output is larger.But excessive disengagement area and too much scraper plate number all will bring equipment difficulty of processing and required precision is high, equipment size and weight large, take up an area difficulty of arranging greatly, energy consumption is large, investment and the problem such as operating cost is high.And the scraper plate arrangement method that the utility model provides and helical design method, to the dissolved efficiency of thin film evaporator and discharging efficiency helpful.When production line production capacity is certain, the disengagement area that this thin film evaporator is selected can suitably reduce, the overall volume of thin film evaporator and weight, size etc. all will reduce further, and this all will bring the impact be highly profitable in factory building arrangement, equipment cost, infrastructure construction etc.
By thin film evaporator described above, continuous print plastic film mulch, dissolving, discharging technology can be realized after cellulose substances enters, the cellulose solution formed is uniformly dissolved thoroughly, function admirable, extremely be suitable for the technique such as subsequent filter, spinning, and this thin film evaporator is except in the production application of cellulose fibre, is also suitable for the cellulose dissolution process of the multiple products such as production of cellulose film, sponge, non-woven fabrics.
Embodiment 1.
A thin film evaporator, disengagement area is 1m
2, scraper plate columns is 12 row, and wherein have the scraper plate 6 vertically arranged to arrange, other 6 arrange in the scraper plate be obliquely installed, and have 2 row angle [alpha] to be-3 °, and all the other 4 row angle [alpha] are 25 °.Wherein each scraper plate has 3 teeth, tine length is 30mm, and tine length and gap are than being 1.5:1, and scraper plate and inwall spacing are 3mm, and scraper plate knifing section arc length is 40mm.Bottom discharge helix length is 300mm, and cone section part helix spacing is 60mm, and straight part helix pitch is 30mm.
In cellulose percentage composition for 12%, be on the production line of the Lyocell fiber of solvent at NMMO and water, use this thin film evaporator, the maximum production capacity of Lyocell fiber can reach 300 tons/year, and thin film evaporator solvability reaches 0.32 ton/h, material time of staying 1.8min in thin film evaporator under maximum production capacity, solution temperature is lower than 118 DEG C.
Comparative example 1
A thin film evaporator, disengagement area is 1m
2, scraper plate columns is 12 row, and wherein have the scraper plate 6 vertically arranged to arrange, other 6 row blade angle α are 25 °.Each scraper plate has 3 teeth, tine length is 30mm, and tine length and gap are than being 1.5:1, and scraper plate and inwall spacing are 3mm, and scraper plate knifing section arc length is 40mm.Bottom discharge helix length is 300mm, and cone section part helix spacing is 60mm, and straight part helix pitch is 30mm.
In cellulose percentage composition for 12%, be on the production line of the Lyocell fiber of solvent at NMMO and water, use this thin film evaporator, the maximum production capacity of Lyocell fiber is 190 tons/year, and thin film evaporator solvability reaches 0.2 ton/h, material time of staying 1.5min in thin film evaporator under maximum production capacity, solution temperature is lower than 125 DEG C.
Embodiment 2.
A thin film evaporator, disengagement area is 30m
2, scraper plate columns is 24 row, wherein has the scraper plate 12 vertically arranged to arrange, other 12 arrange in the scraper plate be obliquely installed, and have 4 row angle [alpha] to be-5 °, and are distributed in the latter half, all the other 8 row and angle are-5 ° of the first half of scraping panel, to be all angle [alpha] the be scraper plate of 20 °.On scraper plate, tine length and gap are than being 1.5:1, and scraper plate and inwall spacing are 4mm, and scraper plate knifing section arc length is 100mm.Bottom discharge helix length is 450mm, and cone section part helix spacing is 80mm, and straight part helix pitch is 50mm.
In cellulose percentage composition for 12%, be on the production line of the Lyocell fiber of solvent at NMMO and water, use this thin film evaporator, the maximum production capacity of Lyocell fiber can reach 8,000 tons/year, and thin film evaporator solvability reaches 7 tons/h, under maximum production capacity, material time of staying in thin film evaporator only has 2.0min, and solution temperature is lower than 125 DEG C.
Comparative example 2
A thin film evaporator, disengagement area is 30m
2, scraper plate columns is 24 row, and wherein have the scraper plate 12 vertically arranged to arrange, other 12 arranges in the scraper plate be obliquely installed, all the other 12 arrange that to be all angle [alpha] be scraper plates of 20 °.On scraper plate, tine length and gap are than being 1.5:1, and scraper plate and inwall spacing are 4mm, and scraper plate knifing section arc length is 100mm.Bottom discharge helix length is 450mm, and cone section part helix spacing is 80mm, and straight part helix pitch is 50mm.
In cellulose percentage composition for 12%, be on the production line of the Lyocell fiber of solvent at NMMO and water, use this thin film evaporator, the maximum production capacity of Lyocell fiber can reach 6,000 tons/year, and thin film evaporator solvability reaches 5 tons/h, under maximum production capacity, material time of staying in thin film evaporator only has 1.8min, and solution temperature is lower than 135 DEG C.
Embodiment 3.
A thin film evaporator, disengagement area is 35m
2, scraper plate columns is 24 row, wherein has the scraper plate 12 vertically arranged to arrange, other 12 arrange in the scraper plate be obliquely installed, and have 2 row angle [alpha] to be-10 °, and are distributed in the latter half, all the other 10 row and angle are-10 ° of the first half of scraping panel, to be all angle [alpha] the be scraper plate of 15 °.On scraper plate, tine length and gap are than being 1.8:1, and scraper plate and inwall spacing are 5mm, and scraper plate knifing section arc length is 150mm.Bottom discharge helix length is 500mm, and cone section part helix spacing is 100mm, and straight part helix pitch is 80mm.
In cellulose percentage composition for 12%, be on the production line of the Lyocell fiber of solvent at NMMO and water, use this thin film evaporator, the maximum production capacity of Lyocell fiber is 10,000 tons/year, and thin film evaporator solvability is 10.5 tons/h, under maximum production capacity, material time of staying in thin film evaporator is 2.5min, and solution temperature is lower than 125 DEG C.
Comparative example 3
A thin film evaporator, disengagement area is 35m
2, scraper plate columns is 24 row, wherein has the scraper plate 12 vertically arranged to arrange, other 12 arrange in the scraper plate be obliquely installed that to be all angle [alpha] the be scraper plates of 15 °.On scraper plate, tine length and gap are than being 1.8:1, and scraper plate and inwall spacing are 5mm, and scraper plate knifing section arc length is 150mm.Bottom discharge helix length is 500mm, and cone section part helix spacing is 100mm, and straight part helix pitch is 80mm.
In cellulose percentage composition for 12%, be on the production line of the Lyocell fiber of solvent at NMMO and water, use this thin film evaporator, the maximum production capacity of Lyocell fiber is 0.75 ten thousand ton/year, and thin film evaporator solvability is 6.8 tons/h, under maximum production capacity, material time of staying in thin film evaporator is 2.5min, and solution temperature is lower than 137 DEG C.
Embodiment 4.
A thin film evaporator, disengagement area is 52m
2, scraper plate columns is 36 row, and the scraper plate 18 wherein vertically arranged arranges, other 18 row tilt in the scraper plate of arrangement, have 4 row angle [alpha] to be-3 °, and are distributed in the latter half, all the other 14 row and angle are-3 ° of the first half of scraping panel, to be all angle [alpha] the be scraper plate of 25 °.On scraper plate, tine length and gap are than being 1.5:1, and scraper plate and inwall spacing are 4mm, and scraper plate knifing section arc length is 100mm.Bottom discharge helix length is 600mm, and cone section part helix spacing is 100mm, and straight part helix pitch is 70mm.
In cellulose percentage composition for 12%, be on the production line of the Lyocell fiber of solvent at NMMO and water, use this thin film evaporator, the maximum production capacity of Lyocell fiber can reach 1.5 ten thousand tons/year, and thin film evaporator solvability reaches 16 tons/h, under maximum production capacity, material time of staying in thin film evaporator only has 2.5min, and solution temperature is lower than 130 DEG C.
Comparative example 4
A thin film evaporator, disengagement area is 52m
2, scraper plate columns is 36 row, and the scraper plate 18 wherein vertically arranged arranges, other 18 row tilt arrangement scraper plate in be all angle [alpha] the be scraper plate of 25 °.On scraper plate, tine length and gap are than being 1.5:1, and scraper plate and inwall spacing are 4mm, and scraper plate knifing section arc length is 100mm.Bottom discharge helix length is 600mm, and cone section part helix spacing is 100mm, and straight part helix pitch is 70mm.
In cellulose percentage composition for 12%, be on the production line of the Lyocell fiber of solvent at NMMO and water, use this thin film evaporator, the maximum production capacity of Lyocell fiber can reach 1.2 ten thousand tons/year, and thin film evaporator solvability reaches 12.5 tons/h, under maximum production capacity, material time of staying in thin film evaporator only has 2.3min, and solution temperature is lower than 145 DEG C.
According to above embodiment and comparative example, can illustrate that thin film evaporator that the utility model describes is less than the scraper plate be obliquely installed of 0 ° owing to have employed angle [alpha], so solvability is larger.Under identical disengagement area, solution temperature is lower, and production line production capacity is larger.
The foregoing is only preferred embodiment of the present utility model; it should be pointed out that for the ordinary skill in the art, do not departing under the utility model principle prerequisite; can also make various deformation and improvement, this also should be considered as protection domain of the present utility model.
Claims (23)
1. the thin film evaporator for cellulose dissolution, it is characterized in that: described thin film evaporator comprises a chamber, one is arranged on rotatable cylindrical rotors in chamber, one row or multiple row are arranged on the scraper plate of rotor outer periphery in the axial direction, described scraper plate comprises the scraper plate vertically arranged and the scraper plate be obliquely installed, described in the scraper plate that is obliquely installed comprise the scraper plate in vertical direction with negative angle and the scraper plate in vertical direction with positive-angle.
2. a kind of thin film evaporator for cellulose dissolution according to claim 1, is characterized in that: the scraper plate of described one-tenth positive-angle is the scraper plate along being obliquely installed counterclockwise, and the scraper plate of described one-tenth negative angle is the scraper plate along being obliquely installed clockwise.
3. a kind of thin film evaporator for cellulose dissolution according to claim 1 and 2, is characterized in that: the scraper plate of described vertical setting and the scraper plate interval be obliquely installed are arranged, and the angle of inclination of described adjacent two row scraper plates is different.
4. a kind of thin film evaporator for cellulose dissolution according to claim 1 and 2, is characterized in that: often row scraper plate comprises multiple spaced scraper plate vertically, and adjacent two row scraper plates are crisscross arranged.
5. a kind of thin film evaporator for cellulose dissolution according to claim 3, is characterized in that: often row scraper plate comprises multiple spaced scraper plate vertically, and adjacent two row scraper plates are crisscross arranged.
6. a kind of thin film evaporator for cellulose dissolution according to claim 1 or 2 or 5, is characterized in that: the row in described scraper plate or several row scraper plate are the scraper plate of negative angle from top to bottom.
7. a kind of thin film evaporator for cellulose dissolution according to claim 1 or 2 or 5, is characterized in that: the row in described scraper plate or several row scraper plate part scraper plate are from top to bottom the scraper plate of negative angle.
8. a kind of thin film evaporator for cellulose dissolution according to claim 7, is characterized in that: in described scraper plate, the latter half of row or several row scraper plate is the scraper plate of negative angle.
9. a kind of thin film evaporator for cellulose dissolution according to claim 1 and 2, is characterized in that: the scraper plate of described one-tenth negative angle, and its columns is 2 to 8 row.
10. a kind of thin film evaporator for cellulose dissolution according to claim 9, is characterized in that: the scraper plate of described one-tenth negative angle, and its columns is 2 to 4 row.
11. a kind of thin film evaporators for cellulose dissolution according to claim 1 and 2, is characterized in that: the scraper plate of described one-tenth negative angle and vertical direction angulation are α, described α is-40 ° ~ 0 °.
12. a kind of thin film evaporators for cellulose dissolution according to claim 11, is characterized in that: described α is-20 ~-2 °.
13. a kind of thin film evaporators for cellulose dissolution according to claim 12, is characterized in that: described α is-10 ~-3 °.
14. a kind of thin film evaporators for cellulose dissolution according to claim 1 and 2, it is characterized in that: described scraper plate end is flute profile, between the length of tooth and adjacent teeth, the ratio in gap is less than 2:1.
15. a kind of thin film evaporators for cellulose dissolution according to claim 14, is characterized in that: between the length of described tooth and adjacent teeth, the ratio in gap is less than 1.8:1.
16. a kind of thin film evaporators for cellulose dissolution according to claim 14, is characterized in that: between the length of described tooth and adjacent teeth, the ratio in gap is less than 1.5:1.
17. a kind of thin film evaporators for cellulose dissolution according to claim 14, is characterized in that: the length of described tooth is less than 40mm.
18. a kind of thin film evaporators for cellulose dissolution according to claim 17, is characterized in that: the length 10 ~ 35mm of described tooth.
19. a kind of thin film evaporators for cellulose dissolution according to claim 17, is characterized in that: the length 15 ~ 30mm of described tooth.
20. a kind of thin film evaporators for cellulose dissolution according to claim 1 and 2, it is characterized in that: the end of described scraper plate is provided with the knifing section of arc, the arc length of arc knifing section is 5 ~ 400mm, and knifing section end-to-end distance scrapping off film evaporator inner wall distance is less than 10mm.
21. a kind of thin film evaporators for cellulose dissolution according to claim 20, is characterized in that: the arc length of arc knifing section is 20 ~ 200mm, and knifing section end-to-end distance scrapping off film evaporator inner wall distance is 2 ~ 5mm.
22. a kind of thin film evaporators for cellulose dissolution according to claim or 2, it is characterized in that: described cavity bottom arranges a cone section, described cone Duan Houzai establishes a straight section, is provided with discharging spiral in described cone section and straight section.
23. a kind of thin film evaporators for cellulose dissolution according to claim 22, is characterized in that: described cone section part helix flight pitch is greater than straight part screw spacing.
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| CN201520279170.8U CN204745702U (en) | 2015-04-30 | 2015-04-30 | A film evaporator for cellulose dissolves |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520279170.8U CN204745702U (en) | 2015-04-30 | 2015-04-30 | A film evaporator for cellulose dissolves |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104826349A (en) * | 2015-04-30 | 2015-08-12 | 中国纺织科学研究院 | Film evaporator for cellulose dissolving |
| CN108940810A (en) * | 2018-07-17 | 2018-12-07 | 芜湖万向新元环保科技有限公司 | A kind of trommelling device that can prevent powder from accumulating |
| CN111530105A (en) * | 2020-04-03 | 2020-08-14 | 温州正展机械有限公司 | Thin film evaporator |
-
2015
- 2015-04-30 CN CN201520279170.8U patent/CN204745702U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104826349A (en) * | 2015-04-30 | 2015-08-12 | 中国纺织科学研究院 | Film evaporator for cellulose dissolving |
| CN108940810A (en) * | 2018-07-17 | 2018-12-07 | 芜湖万向新元环保科技有限公司 | A kind of trommelling device that can prevent powder from accumulating |
| CN111530105A (en) * | 2020-04-03 | 2020-08-14 | 温州正展机械有限公司 | Thin film evaporator |
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