CN103900350B - Method for preventing sodium gluconate wet crystals from caking in drying process - Google Patents
Method for preventing sodium gluconate wet crystals from caking in drying process Download PDFInfo
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Abstract
The invention discloses a method for preventing sodium gluconate wet crystals from caking in the drying process and hardening during the storage period. Based on an existing drying process of a vibrated fluidized bed for the sodium gluconate wet crystals, a pneumatic conveying and feeding method is used for replacing an original vibration feeder, and the temperature and wind speed of the air flow for drying are regulated in a segmentation mode, so that the sodium gluconate wet crystals after centrifugal separation have better dispersity when entering the fluidized bed. The drying temperature after the sodium gluconate wet crystals enter the fluidized bed is controlled in a segmentation mode, so that the problems that the sodium gluconate wet crystals cluster and cake in the drying process and get damp and harden during the storage period are effectively prevented. The method for preventing sodium gluconate wet crystals from caking in the drying process and hardening during the storage period largely improves the pass rate of dried products, and guarantees the stability of the quality of products.
Description
Technical field
The present invention relates to a kind of drying process of gluconic acid sodium salt, particularly relate to a kind of prevent gluconic acid sodium salt from wetting method that agglomerating in crystal dry run, caking and storage life harden.
Background technology
Gluconic acid sodium salt, also known as sodium pentahydyoxycaproate, is a kind of white or light yellow crystalline powder, soluble in water, is slightly soluble in alcohol, is insoluble to ether.Be the organic acid salt of multihydroxyl that a kind of purposes is extremely wide, be widely used in water quality stabilizer, steel surface cleaning agent, vial scavenger specially, the aspects such as cement additive.Special in cement additive, along with the development of urban skyscraper and city mixing plant, gluconic acid sodium salt uses as water reducer and set retarder, achieves good effect, promotes and is used widely rapidly in world wide.
At present, gluconic acid sodium salt mainly adopts fermentation method to produce.The method take glucose as raw material, transformed generate gluconic acid by aspergillus niger strain, by flowing in hydro-oxidation sodium and generating gluconic acid sodium salt in sweat.After fermentation ends, fermentation liquor is filtered and is removed thalline, and clear liquid obtains gluconic acid sodium salt through Vacuum Concentration, crystallization, centrifugation and to wet crystal, drying, the grading again of wet crystal, is packaged to be gluconic acid sodium salt product.
At present, the wet drying of crystal of gluconic acid sodium salt adopts vibra fluidized bed drying technique more: will be separated the wet crystal obtained through centrifuge, directly enter vibra feeder, vibra fluidized bed drying room is entered by after dispenser vibration dispersion, under vibration and dry wind action, material is constantly travelled forward by throwing in the horizontal direction.In its process, dry wind is provided by air blast, and after being heated by heat exchanger, air outlet through setting is sent into fluid bed and to be left the bed body, then carries out heat exchange through fluidized bed sieve plate with material, and the wind after heat exchange is discharged by the air-introduced machine above drying bed again, material completes drying at the volley, dried material is discharged by discharge gate, classified sieve screening, qualified products packaging warehouse-in (see Fig. 1).
But gluconic acid sodium salt wets in crystal drying production, and wet crystal is delivered into fluid bed charging aperture by vibra feeder.Because gluconic acid sodium salt crystal grain is comparatively thin, centrifugal rear moisture content higher (about 3%), the dispersibility of vibra feeder to wet crystal is limited, disperses bad when causing material to enter vibra fluidized bed drying room, has accumulation, becomes block phenomenon.In dry materials process, fluid bed each air inlet EAT is identical, wind-warm syndrome is about 100-110 DEG C, the wet crystal entering fluid bed directly contacts with high warm air, and the evaporation of material surface moisture is too fast, and material is agglomerating, caking easily, after the outside drying of agglomerate is hardening, internal moisture cannot continue volatilization, causes this part material moisture to exceed standard, causes discharging substandard product large percentage.In addition, because dry run wind-warm syndrome is high, after dry, material temperature is also higher, be entrained with high temperature in material, containing humid air, such material is directly packed, when after material cooling, have condensed water in packaging bag to separate out, make product occur phenomenons such as getting damp, harden in storage and transport process.For solving the problem, producing upper main employing two kinds of ways at present and remedying: after pulverizer is pulverized, returning drying section for after the agglomerate product-collecting of the formation in dry run; For packaging after get damp, harden rotten product, need again dissolve rear recrystallization.So not only consuming time, effort, also can increase energy resource consumption, increase production cost, simultaneously constant product quality is also difficult to ensure.
Summary of the invention
For the deficiencies in the prior art, the present invention aims to provide a kind of prevent gluconic acid sodium salt from wetting method that agglomerating in crystal dry run, caking and storage life harden.
Of the present invention prevent gluconic acid sodium salt from wetting method that caking and storage life in crystal dry run harden is: wet on the basis of crystal vibration fluid bed drying process at the existing gluconic acid sodium salt that is applicable to, pneumatic convey feeder is adopted to replace original vibra feeder, gluconic acid sodium salt after the centrifugation crystal that wets fully is scattered when entering vibrated fluidized bed, namely material is before it is dried in dispersity, segmentation regulation and control implemented to fluid bed hothouse wind-warm syndrome and wind speed simultaneously and increase cold dry-air blast section, material is first made progressively to heat up drying, increase cold wind section again, lower the temperature to dried material, agglomerating in crystal dry run to realize preventing gluconic acid sodium salt from wetting, get damp after caking and packaging, the phenomenon such as harden.
Wherein, gluconic acid sodium salt after the above-mentioned centrifugation crystal that wets adopts pneumatic convey feeder by centrifuge to the conveying of vibrated fluidized bed charging aperture, its carrying method and technological parameter are: the crystal that wet by the gluconic acid sodium salt after centrifugation falls under gravity into the hopper 2-4 of pneumatic convey feeder, then blower fan 2-1 is utilized, filter 2-2 and heat exchanger 2-3 provides flow velocity 40-60m/s, the wet crystal that hopper is discharged by the wind of temperature 35-40 DEG C sends into downside rotation type electro cyclone separator 2-5 through conveyance conduit, revolve a point rear crystal and enter fluid bed 2-8 by lower end outlet, time of delivery is 0.05-0.15 second,
The stage drying method that above-mentioned crystal is implemented after entering fluid bed is: utilize blower fan 2-9, filter 2-10 and heat exchanger 2-11 to provide the wind of flow velocity 25-30m/s, temperature 40-45 DEG C to just entering fluid bed and along with the drying vibrating the crystal that constantly moves forward and implement first paragraph, drying time 2-3 minute; Utilize blower fan 2-12, filter 2-13 and heat exchanger 2-14 provide the wind of flow velocity 20-25m/s, temperature 75-85 DEG C on fluid bed along with vibration continues the drying that the crystal that moves forward implements second segment, drying time 4-5 minute; Utilize blower fan 2-15, filter 2-16 and cooling driers 2-17 provide flow velocity 30-35m/s, pressure leak source 2-5 DEG C (its atmospheric pressure dew point quite-20 DEG C), temperature 15-25 DEG C wind on fluid bed along with drying and the cooling of vibrating the crystal moved forward and implement the 3rd section, time 2-3 minute.Process chart is shown in accompanying drawing 2.
Prevent gluconic acid sodium salt from wetting method that caking and storage life in crystal dry run harden of the present invention is preferred embodiment:
The crystal that wet by gluconic acid sodium salt after centrifugation falls under gravity into the hopper 2-4 of pneumatic convey feeder, then utilize the wet crystal that blower fan 2-1, filter 2-2 and heat exchanger 2-3 provide flow velocity 50m/s, hopper is discharged by the wind of temperature 40 DEG C to send into downside rotation type electro cyclone separator 2-5 through conveyance conduit, revolve a point rear crystal and enter fluid bed by lower end outlet.
Above-mentioned crystal preferably implements 3 sections of dryings after entering fluid bed, method is: utilize blower fan 2-9, filter 2-10 and heat exchanger 2-11 to provide the wind of flow velocity 30m/s, temperature 40 DEG C to just entering fluid bed and along with the drying vibrating the crystal that constantly moves forward and implement first paragraph, 3 minutes drying times; Blower fan 2-12, filter 2-13 and heat exchanger 2-14 is utilized to provide the wind of flow velocity 25m/s, temperature 80 DEG C to implement the drying of second segment to the crystal that fluid bed continues to move forward along with vibration, 4 minutes drying times; Utilize blower fan 2-15, filter 2-16 and cooling driers 2-17 provide flow velocity 35m/s, pressure leak source 2-5 DEG C (its atmospheric pressure dew point quite-20 DEG C), temperature 15 DEG C wind on fluid bed along with drying and the cooling of vibrating the crystal moved forward and implement the 3rd section, 2 minutes time.
Pneumatic convey feeder is adopted to substitute original vibra feeder in the inventive method, by in the low warm air gluconic acid sodium salt after centrifugal wet crystal be delivered to vibrated fluidized bed, can make centrifugal after crystal fully to disperse and preliminarily dried, avoid wet crystal material in former technique to enter the uneven phenomenon of fluid bed dispersion.Simultaneously, fluidized bed drying of the present invention adopts three sections of temperature-controlled drying techniques, during first paragraph adopts, warm air is dry, and material preheating disperseing in process of air delivery in advance in addition, avoids low-temperature material and directly contact with high warm air the phenomenon that the material caused is agglomerating, lump; Second segment through preliminarily dried and dispersion adopts high warm air to carry out abundant drying to material; 3rd section uses through the low temperature of frozen dried, the wind of low humidity, not only can continue the residual moisture taking away material surface, make temperature of charge reduce simultaneously.The drying air temperature that material after this technique drying, cooling is carried secretly is low, humidity is little, occurs product quality problems such as getting damp, harden after avoiding the packing of product.The gluconic acid sodium salt that the present invention proposes wets crystallizing and drying technique, and greatly reduce the generation of material caking in dry run, the phenomenon such as agglomerating, dry products qualification rate is improved significantly, and the stability of product quality is also guaranteed.
Accompanying drawing explanation
Fig. 1: conventional gluconic acid sodium salt wets crystal vibration fluid bed drying process device schematic diagram
Wherein: 1-1 vibra feeder, 1-2 vibrated fluidized bed body, 1-3 heat exchanger, 1-4 air cleaner, 1-5 air blast, 1-6 sack cleaner, 1-7 air-introduced machine.
Fig. 2: gluconic acid sodium salt provided by the invention wets crystal vibration fluid bed drying process device schematic diagram
Wherein: 2-1 air blast, 2-2 air cleaner, 2-3 heat exchanger, 2-4 pneumatic convey feeder hopper, 2-5 cyclone separator, 2-6 sack cleaner, 2-7 air-introduced machine, 2-8 vibrated fluidized bed body, 2-9 air blast, 2-10 air cleaner, 2-11 heat exchanger, 2-12 air blast, 2-13 air cleaner, 2-14 heat exchanger, 2-15 air blast, 2-16 air cleaner, 2-17 cooling driers.
Detailed description of the invention
Embodiment 1
Gained gluconic acid sodium salt crystallization 2000kg after centrifugation, moisture content 2.5%, adopt pneumatic convey feeder, utilize blower fan 2-1, filter 2-2 and heat exchanger 2-3 to provide flow velocity 50m/s, the wet crystal after centrifugation delivered to downside rotation type electro cyclone separator 2-5 by the hopper wind of pneumatic convey feeder by the wind of temperature 35 DEG C, after material hangs in the separator and divides, crystal is exported by separator lower end and enters vibrated fluidized bed 2-8.
Gluconic acid sodium salt wets after crystal material enters fluid bed, implements 3 sections of temperature-controlled dryings.Blower fan 2-9, filter 2-10 and heat exchanger 2-11 is utilized to provide the wind of flow velocity 25m/s, temperature 40 DEG C to just entering fluid bed and along with the drying vibrating the crystal that constantly moves forward and implement first paragraph, 3 minutes drying times; Blower fan 2-12, filter 2-13 and heat exchanger 2-14 is utilized to provide the wind of flow velocity 25m/s, temperature 75 DEG C to implement the drying of second segment to the crystal that fluid bed continues to move forward along with vibration, 4 minutes drying times; Utilize blower fan 2-15, filter 2-16 and cooling driers 2-17 provide flow velocity 35m/s, pressure leak source 2-5 DEG C (its atmospheric pressure dew point quite-20 DEG C), temperature 20 DEG C wind on fluid bed along with drying and the cooling of vibrating the crystal moved forward and implement the 3rd section, 2 minutes time.Dried material water ratio is 0.3-0.4%, and temperature of charge is 28-30 DEG C, and discharging qualification rate 98-99%, does not occur problems such as getting damp, harden after packaging.
Embodiment 2
Gained gluconic acid sodium salt crystallization 2000kg after centrifugation, moisture content 3.0%, adopt pneumatic convey feeder, utilize blower fan 2-1, filter 2-2 and heat exchanger 2-3 to provide flow velocity 50m/s, the wet crystal after centrifugation delivered to downside rotation type electro cyclone separator 2-5 by the hopper wind of pneumatic convey feeder by the wind of temperature 40 DEG C, after material hangs in the separator and divides, crystal is exported by separator lower end and enters vibrated fluidized bed 2-8.
Gluconic acid sodium salt wets after crystal material enters fluid bed, implements 3 sections of temperature-controlled dryings.Blower fan 2-9, filter 2-10 and heat exchanger 2-11 is utilized to provide the wind of flow velocity 30m/s, temperature 45 C to just entering fluid bed and along with the drying vibrating the crystal that constantly moves forward and implement first paragraph, 3 minutes drying times; Blower fan 2-12, filter 2-13 and heat exchanger 2-14 is utilized to provide the wind of flow velocity 25m/s, temperature 80 DEG C to implement the drying of second segment to the crystal that fluid bed continues to move forward along with vibration, 4 minutes drying times; Utilize blower fan 2-15, filter 2-16 and cooling driers 2-17 provide flow velocity 35m/s, pressure leak source 2-5 DEG C (its atmospheric pressure dew point quite-20 DEG C), temperature 15 DEG C wind on fluid bed along with drying and the cooling of vibrating the crystal moved forward and implement the 3rd section, 2 minutes time.Dried material water ratio is 0.4-0.5%, and temperature of charge is 28-30 DEG C, and discharging qualification rate 98-99%, does not occur problems such as getting damp, harden after packaging.
Embodiment 3
To wet crystal vibration fluid bed drying process device schematic diagram according to Fig. 2 gluconic acid sodium salt.
Gained gluconic acid sodium salt crystallization 2000kg after centrifugation, moisture content 3.2%.
The crystal that wet by gluconic acid sodium salt after centrifugation falls under gravity into the hopper 2-4 of pneumatic convey feeder, then the wet crystal that blower fan 2-1, filter 2-2 and heat exchanger 2-3 provide flow velocity 60m/s, hopper is discharged by the wind of temperature 35 DEG C is utilized to send into downside rotation type electro cyclone separator 2-5 through conveyance conduit, revolve a point rear crystal and enter fluid bed 2-8 by lower end outlet, time of delivery is 0.1 second.
Gluconic acid sodium salt wets after crystal material enters fluid bed, implement 3 sections of temperature-controlled dryings, method is: utilize blower fan 2-9, filter 2-10 and heat exchanger 2-11 to provide the wind of flow velocity 28m/s, temperature 42 DEG C to just entering fluid bed and along with the drying vibrating the crystal that constantly moves forward and implement first paragraph, 2 minutes drying times; Blower fan 2-12, filter 2-13 and heat exchanger 2-14 is utilized to provide the wind of flow velocity 22m/s, temperature 78 DEG C to implement the drying of second segment to the crystal that fluid bed continues to move forward along with vibration, 5 minutes drying times; Utilize blower fan 2-15, filter 2-16 and cooling driers 2-17 provide flow velocity 32m/s, pressure leak source 2-5 DEG C (its atmospheric pressure dew point quite-20 DEG C), temperature 25 DEG C wind on fluid bed along with drying and the cooling of vibrating the crystal moved forward and implement the 3rd section, 2 minutes time.
Dried material water ratio is 0.4-0.5%, and temperature of charge is 28-30 DEG C, and discharging qualification rate 98-99%, does not occur problems such as getting damp, harden after packaging.
Claims (3)
1. prevent gluconic acid sodium salt from a wetting method that caking and storage life in crystal dry run harden, it is characterized in that: wet on the basis of crystal vibration fluid bed drying process at the existing gluconic acid sodium salt that is applicable to, segmentation regulation and control are implemented to device for transporting objects, fluidized bed drying room wind-warm syndrome and wind speed and increases cold dry-air blast section, gluconic acid sodium salt after the centrifugation crystal that wets fully is disperseed when entering fluid bed, stage drying and dry drop temperature is low, hardens to realize preventing wet caking and storage life in crystal dry run of gluconic acid sodium salt;
Wherein, gluconic acid sodium salt after the described centrifugation crystal that wets adopts pneumatic convey feeder by centrifuge to the conveying of vibrated fluidized bed charging aperture, its carrying method and technological parameter are: the crystal that wet by the gluconic acid sodium salt after centrifugation falls under gravity into the hopper (2-4) of pneumatic convey feeder, then blower fan (2-1) is utilized, filter (2-2) and heat exchanger (2-3) provide flow velocity 40-60m/s, the wet crystal that hopper is discharged by the wind of temperature 35-40 DEG C sends into downside rotation type electro cyclone separator (2-5) through conveyance conduit, revolve a point rear crystal and enter fluid bed (2-8) by lower end outlet, time of delivery is 0.05-0.15 second,
The stage drying method that described crystal is implemented after entering fluid bed is: utilize blower fan (2-9), filter (2-10) and heat exchanger (2-11) to provide the wind of flow velocity 25-30m/s, temperature 40-45 DEG C to just entering fluid bed and along with the drying vibrating the crystal that constantly moves forward and implement first paragraph, drying time 2-3 minute; Utilize blower fan (2-12), filter (2-13) and heat exchanger (2-14) provide the wind of flow velocity 20-25m/s, temperature 75-85 DEG C on fluid bed along with vibration continues the drying that the crystal that moves forward implements second segment, drying time 4-5 minute; Utilize blower fan (2-15), filter (2-16) and cooling driers (2-17) provide flow velocity 30-35m/s, pressure leak source 2-5 DEG C, the wind of temperature 15-25 DEG C on fluid bed along with drying and the cooling of vibrating the crystal moved forward and implement the 3rd section, time 2-3 minute.
2. prevent gluconic acid sodium salt from wetting according to claim 1 method that caking and storage life in crystal dry run harden, it is characterized in that: the crystal that wet by the gluconic acid sodium salt after centrifugation falls under gravity into the hopper (2-4) of pneumatic convey feeder, then utilize the wet crystal that blower fan (2-1), filter (2-2) and heat exchanger (2-3) provide flow velocity 50m/s, hopper is discharged by the wind of temperature 40 DEG C to send into downside rotation type electro cyclone separator (2-5) through conveyance conduit, revolve a point rear crystal and enter fluid bed by lower end outlet.
3. prevent gluconic acid sodium salt from wetting according to claim 1 method that caking and storage life in crystal dry run harden, it is characterized in that: described crystal implements 3 sections of dryings after entering fluid bed, method is: utilize blower fan (2-9), filter (2-10) and heat exchanger (2-11) to provide the wind of flow velocity 30m/s, temperature 40 DEG C to just entering fluid bed and along with the drying vibrating the crystal that constantly moves forward and implement first paragraph, 3 minutes drying times; Blower fan (2-12), filter (2-13) and heat exchanger (2-14) is utilized to provide the wind of flow velocity 25m/s, temperature 80 DEG C to implement the drying of second segment to the crystal that fluid bed continues to move forward along with vibration, 4 minutes drying times; Utilize blower fan (2-15), filter (2-16) and cooling driers (2-17) provide flow velocity 35m/s, pressure leak source 2-5 DEG C, the wind of temperature 15 DEG C on fluid bed along with drying and the cooling of vibrating the crystal moved forward and implement the 3rd section, 2 minutes time.
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| CN104266474A (en) * | 2014-09-03 | 2015-01-07 | 嘉善圣莱斯绒业有限公司 | Vibratory drying and processing device |
| CN114963697A (en) * | 2022-05-11 | 2022-08-30 | 长沙兴嘉生物工程股份有限公司 | Zinc glycinate drying process and device |
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