CN103900350A - 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, relate in particular to a kind of method that prevents that agglomerating in the wet crystal dry run of gluconic acid sodium salt, caking and storage life from hardening.
Background technology
Gluconic acid sodium salt claims again 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.Aspect cement additive, along with the development of urban skyscraper and city mixing plant, gluconic acid sodium salt uses as water reducer and set retarder, has obtained good effect, promotes rapidly and be used widely in world wide especially.
At present, gluconic acid sodium salt mainly adopts fermentation method to produce.The method is taking glucose as raw material, is transformed and is generated gluconic acid by aspergillus niger strain, passes through in stream hydro-oxidation sodium and generate gluconic acid sodium salt in sweat.After fermentation ends, zymotic fluid is removed thalline after filtration, and clear liquid obtains the wet crystal of gluconic acid sodium salt through Vacuum Concentration, crystallization, centrifugation, drying, the grading again of wet crystal, is packaged to be gluconic acid sodium salt product.
At present, dry vibra fluidized bed drying techniques that adopt of the wet crystal of gluconic acid sodium salt: will separate the wet crystal obtaining through centrifuge more, directly enter vibra feeder, by entering vibra fluidized bed drying chamber after dispenser vibration dispersion, under vibration and dry wind action, material along continuous straight runs is constantly travelled forward by throwing.In its process, dry wind is to be provided by air blast, and after being heated by heat exchanger, send into the fluid bed body of leaving the bed through the air outlet of setting, then carry out heat exchange through fluidized bed sieve plate with material, the wind after heat exchange is discharged by the air-introduced machine of drying bed top again, material completes dry at the volley, dried material is discharged by discharge gate, classified sieve screening, qualified products packaging warehouse-in (see figure 1).
But in dry production of the wet crystal of gluconic acid sodium salt, wet crystal is to be delivered into fluid bed charging aperture by vibra feeder.Because gluconic acid sodium salt crystal grain is thinner, centrifugal rear moisture content higher (3% left and right), vibra feeder is limited to the dispersibility of wet crystal, disperses badly while causing material to enter vibra fluidized bed drying chamber, has accumulation, becomes piece phenomenon.In dry materials process, the each air inlet EAT of fluid bed is identical, the about 100-110 DEG C of wind-warm syndrome, the wet crystal that enters fluid bed directly contacts with high warm air, and the evaporation of material surface moisture is too fast, and material is agglomerating, caking easily, when after the outside dry hardening of agglomerate, internal moisture cannot continue volatilization, causes this part material moisture to exceed standard, and causes discharging substandard product large percentage.In addition, because dry run wind-warm syndrome is high, dry rear material temperature is also higher, in material, carrying high temperature secretly, containing humid air, such material is directly packed, after material is cooling, in packaging bag, have condensed water and separate out, make the phenomenons such as getting damp, harden appears in product in storage and transport process.For addressing the above problem, produce at present two kinds of ways of upper main employing and remedy: for returning to drying section after the agglomerate product-collecting of the formation in dry run after pulverizer is pulverized; For the rotten product that gets damp, hardens after packaging, need again dissolve rear recrystallization.So not only consuming time, effort, also can increase energy resource consumption, increase production cost, constant product quality is also difficult to ensure simultaneously.
Summary of the invention
For the deficiencies in the prior art, the present invention aims to provide a kind of method that prevents that agglomerating in the wet crystal dry run of gluconic acid sodium salt, caking and storage life from hardening.
The method that prevents that in the wet crystal dry run of gluconic acid sodium salt, caking and storage life harden of the present invention is: on the existing basis that is applicable to the wet crystal vibra fluidized bed drying technique of gluconic acid sodium salt, adopt air-flow to be delivered into glassware and replace original vibra feeder, the wet crystal of gluconic acid sodium salt after centrifugation is fully scattered in the time entering vibrated fluidized bed, be that material is dispersity before dry, fluid bed hothouse wind-warm syndrome and wind speed are implemented segmentation regulation and control and increased cold dry-air blast section simultaneously, first make material progressively heat up dry, increase again cold wind section, give dried material cooling, prevent in the wet crystal dry run of gluconic acid sodium salt agglomerating with realization, after caking and packaging, get damp, the phenomenon such as harden.
Wherein, the wet crystal of gluconic acid sodium salt after above-mentioned centrifugation adopts air-flow to be delivered into glassware by centrifuge to the conveying of vibrated fluidized bed charging aperture, its carrying method and technological parameter are: the hopper 2-4 that wet gluconic acid sodium salt after centrifugation crystal is fallen under gravity into air-flow and is delivered into glassware, then utilize blower fan 2-1, filter 2-2 and heat exchanger 2-3 provide flow velocity 40-60m/s, the wet crystal that the wind of temperature 35-40 DEG C is discharged hopper is sent 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,
Above-mentioned crystal enters the stage drying method of implementing after fluid bed: 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 crystal that constantly moves forward of vibration is implemented the dry of first paragraph, drying time 2-3 minute; Utilize blower fan 2-12, filter 2-13 and heat exchanger 2-14 to provide the wind of flow velocity 20-25m/s, temperature 75-85 DEG C to implement the dry of second segment to the crystal that continues to move forward along with vibration on fluid bed, drying time 4-5 minute; Utilize blower fan 2-15, filter 2-16 and cooling driers 2-17 to provide the wind of 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 the crystal moving forward along with vibration on fluid bed to be implemented to the dry and cooling of the 3rd section, time 2-3 minute.Process chart is shown in accompanying drawing 2.
Of the present inventionly prevent that method that in the wet crystal dry run of gluconic acid sodium salt, caking and storage life harden is preferred embodiment:
Wet gluconic acid sodium salt after centrifugation crystal is fallen under gravity into air-flow and is delivered into the hopper 2-4 of glassware, then the wet crystal that utilizes blower fan 2-1, filter 2-2 and heat exchanger 2-3 to provide the wind of 40 DEG C of flow velocity 50m/s, temperature that hopper is discharged is sent into downside rotation type electro cyclone separator 2-5 through conveyance conduit, and after revolving point, a crystal is exported and entered fluid bed by lower end.
After above-mentioned crystal enters fluid bed, preferably 3 sections of enforcements are dry, method is: utilize wind that blower fan 2-9, filter 2-10 and heat exchanger 2-11 provide 40 DEG C of flow velocity 30m/s, temperature to implement the dry of first paragraph, 3 minutes drying times to the crystal that just enters fluid bed and constantly move forward along with vibration; Utilize blower fan 2-12, filter 2-13 and heat exchanger 2-14 to provide the wind of 80 DEG C of flow velocity 25m/s, temperature to implement the dry of second segment, 4 minutes drying times to the crystal that continues to move forward along with vibration on fluid bed; Utilize blower fan 2-15, filter 2-16 and cooling driers 2-17 to provide the wind of 15 DEG C of flow velocity 35m/s, pressure leak source 2-5 DEG C (its atmospheric pressure dew point quite-20 DEG C), temperature the crystal moving forward along with vibration on fluid bed to be implemented to the dry and cooling of the 3rd section, 2 minutes time.
In the inventive method, adopt air-flow to be delivered into glassware and substitute original vibra feeder, by in low warm air wet the gluconic acid sodium salt after centrifugal crystal is delivered to vibrated fluidized bed, can make the crystal after centrifugal fully disperse and preliminarily dried, avoid in former technique wet crystal material to enter fluid bed and disperse inhomogeneous phenomenon.Simultaneously, fluidized bed drying of the present invention adopts three sections of temperature-controlled drying techniques, in first paragraph employing, warm air is dry, and material preheating dispersion in process of air delivery in advance in addition avoided low-temperature material directly to contact the phenomenon that the material causing is agglomerating, lump with high warm air; Adopt high warm air to be fully dried material through the second segment of preliminarily dried and dispersion; The 3rd section of use, through the low temperature of frozen dried, the wind of low humidity, not only can continue to take away the residual moisture on material surface, makes temperature of charge reduce simultaneously.That material after, cooling dry through this technique is carried secretly is dry low with air temperature, humidity is little, the product quality problem such as avoided occurring getting damp, harden after the packing of product.The wet crystallizing and drying technique of gluconic acid sodium salt that the present invention proposes, has greatly reduced the generation of material caking in dry run, the phenomenon such as agglomerating, and dry products qualification rate is improved significantly, and the stability of product quality is also guaranteed.
Brief description of the drawings
Fig. 1: the wet crystal vibra fluidized bed drying process unit schematic diagram of conventional gluconic acid sodium salt
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: the gluconic acid sodium salt provided by the invention crystal vibra fluidized bed drying process unit schematic diagram that wets
Wherein: 2-1 air blast, 2-2 air cleaner, 2-3 heat exchanger, 2-4 air-flow is delivered into glassware 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 air-flow to be delivered into glassware, the hopper wind that utilizes blower fan 2-1, filter 2-2 and heat exchanger 2-3 to provide the wind of 35 DEG C of flow velocity 50m/s, temperature that the wet crystal after centrifugation is delivered into glassware by air-flow is delivered to downside rotation type electro cyclone separator 2-4, material is in separator after outstanding point, and crystal enters vibrated fluidized bed 2-8 by separator lower end outlet.
The wet crystal material of gluconic acid sodium salt enters after fluid bed, implements 3 sections of temperature-controlled dryings.Utilize wind that blower fan 2-9, filter 2-10 and heat exchanger 2-11 provide 40 DEG C of flow velocity 25m/s, temperature to implement the dry of first paragraph, 3 minutes drying times to the crystal that just enters fluid bed and constantly move forward along with vibration; Utilize blower fan 2-12, filter 2-13 and heat exchanger 2-14 to provide the wind of 75 DEG C of flow velocity 25m/s, temperature to implement the dry of second segment, 4 minutes drying times to the crystal that continues to move forward along with vibration on fluid bed; Utilize blower fan 2-15, filter 2-16 and cooling driers 2-17 to provide the wind of 20 DEG C of flow velocity 35m/s, pressure leak source 2-5 DEG C (its atmospheric pressure dew point quite-20 DEG C), temperature the crystal moving forward along with vibration on fluid bed to be implemented to the dry and cooling of the 3rd section, 2 minutes time.Dried material water ratio is 0.3-0.4%, and temperature of charge is 28-30 DEG C, discharging qualification rate 98-99%, and the problem such as do not occur after packaging getting damp, harden.
Embodiment 2
Gained gluconic acid sodium salt crystallization 2000kg after centrifugation, moisture content 3.0%, adopt air-flow to be delivered into glassware, the hopper wind that utilizes blower fan 2-1, filter 2-2 and heat exchanger 2-3 to provide the wind of 40 DEG C of flow velocity 50m/s, temperature that the wet crystal after centrifugation is delivered into glassware by air-flow is delivered to downside rotation type electro cyclone separator 2-4, material is in separator after outstanding point, and crystal enters vibrated fluidized bed 2-8 by separator lower end outlet.
The wet crystal material of gluconic acid sodium salt enters after fluid bed, implements 3 sections of temperature-controlled dryings.Utilize blower fan 2-9, filter 2-10 and heat exchanger 2-11 to provide the wind of flow velocity 30m/s, temperature 45 C to just entering fluid bed and implementing the dry of first paragraph, 3 minutes drying times along with vibrating the crystal constantly moving forward; Utilize blower fan 2-12, filter 2-13 and heat exchanger 2-14 to provide the wind of 80 DEG C of flow velocity 25m/s, temperature to implement the dry of second segment, 4 minutes drying times to the crystal that continues to move forward along with vibration on fluid bed; Utilize blower fan 2-15, filter 2-16 and cooling driers 2-17 to provide the wind of 15 DEG C of flow velocity 35m/s, pressure leak source 2-5 DEG C (its atmospheric pressure dew point quite-20 DEG C), temperature the crystal moving forward along with vibration on fluid bed to be implemented to the dry and cooling of the 3rd section, 2 minutes time.Dried material water ratio is 0.4-0.5%, and temperature of charge is 28-30 DEG C, discharging qualification rate 98-99%, and the problem such as do not occur after packaging getting damp, harden.
Embodiment 3
According to the wet crystal vibra fluidized bed drying process unit schematic diagram of Fig. 2 gluconic acid sodium salt.
Gained gluconic acid sodium salt crystallization 2000kg after centrifugation, moisture content 3.2%.
Wet gluconic acid sodium salt after centrifugation crystal is fallen under gravity into air-flow and is delivered into the hopper 2-4 of glassware, then the wet crystal that utilizes blower fan 2-1, filter 2-2 and heat exchanger 2-3 to provide the wind of 35 DEG C of flow velocity 60m/s, temperature that hopper is discharged is sent 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.
The wet crystal material of gluconic acid sodium salt enters after fluid bed, implement 3 sections of temperature-controlled dryings, method is: utilize wind that blower fan 2-9, filter 2-10 and heat exchanger 2-11 provide 42 DEG C of flow velocity 28m/s, temperature to implement the dry of first paragraph, 2 minutes drying times to the crystal that just enters fluid bed and constantly move forward along with vibration; Utilize blower fan 2-12, filter 2-13 and heat exchanger 2-14 to provide the wind of 78 DEG C of flow velocity 22m/s, temperature to implement the dry of second segment, 5 minutes drying times to the crystal that continues to move forward along with vibration on fluid bed; Utilize blower fan 2-15, filter 2-16 and cooling driers 2-17 to provide the wind of 25 DEG C of flow velocity 32m/s, pressure leak source 2-5 DEG C (its atmospheric pressure dew point quite-20 DEG C), temperature the crystal moving forward along with vibration on fluid bed to be implemented to the dry and cooling of the 3rd section, 2 minutes time.
Dried material water ratio is 0.4-0.5%, and temperature of charge is 28-30 DEG C, discharging qualification rate 98-99%, and the problem such as do not occur after packaging getting damp, harden.
Claims (3)
1. a method that prevents that in the wet crystal dry run of gluconic acid sodium salt, caking and storage life harden, it is characterized in that: on the existing basis that is applicable to the wet crystal vibra fluidized bed drying technique of gluconic acid sodium salt, device for transporting objects, fluidized bed drying chamber wind-warm syndrome and wind speed are implemented segmentation regulation and control and increased cold dry-air blast section, the wet crystal of gluconic acid sodium salt after centrifugation is fully disperseed in the time entering fluid bed, stage drying and dry drop temperature are low, prevent in the wet crystal dry run of gluconic acid sodium salt that to realize caking and storage life harden;
Wherein, the wet crystal of gluconic acid sodium salt after described centrifugation adopts air-flow to be delivered into glassware by centrifuge to the conveying of vibrated fluidized bed charging aperture, its carrying method and technological parameter are: wet the gluconic acid sodium salt after centrifugation crystal is fallen under gravity into the hopper (2-4) that air-flow is delivered into glassware, then utilize blower fan (2-1), filter (2-2) and heat exchanger (2-3) provide flow velocity 40-60m/s, the wet crystal that the wind of temperature 35-40 DEG C is discharged hopper is sent 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,
Described crystal enters the stage drying method of implementing after fluid bed: 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 crystal that constantly moves forward of vibration is implemented the dry of first paragraph, drying time 2-3 minute; Utilize blower fan (2-12), filter (2-13) and heat exchanger (2-14) to provide the wind of flow velocity 20-25m/s, temperature 75-85 DEG C to implement the dry of second segment to the crystal that continues to move forward along with vibration on fluid bed, drying time 4-5 minute; Utilize blower fan (2-15), filter (2-16) and cooling driers (2-17) to provide the wind of flow velocity 30-35m/s, pressure leak source 2-5 DEG C, temperature 15-25 DEG C the crystal moving forward along with vibration on fluid bed to be implemented to the dry and cooling of the 3rd section, time 2-3 minute.
2. prevent according to claim 1 the method that in the wet crystal dry run of gluconic acid sodium salt, caking and storage life harden, it is characterized in that: wet the gluconic acid sodium salt after centrifugation crystal is fallen under gravity into the hopper (2-4) that air-flow is delivered into glassware, then the wet crystal that utilizes blower fan (2-1), filter (2-2) and heat exchanger (2-3) to provide the wind of 40 DEG C of flow velocity 50m/s, temperature that hopper is discharged is sent into downside rotation type electro cyclone separator (2-5) through conveyance conduit, and after revolving point, a crystal is exported and entered fluid bed by lower end.
3. prevent according to claim 1 the method that in the wet crystal dry run of gluconic acid sodium salt, caking and storage life harden, it is characterized in that: described crystal enter implement after fluid bed 3 sections dry, method is: utilize wind that blower fan (2-9), filter (2-10) and heat exchanger (2-11) provide 40 DEG C of flow velocity 30m/s, temperature to implement the dry of first paragraph, 3 minutes drying times to the crystal that just enters fluid bed and constantly move forward along with vibration; Utilize blower fan (2-12), filter (2-13) and heat exchanger (2-14) to provide the wind of 80 DEG C of flow velocity 25m/s, temperature to implement the dry of second segment, 4 minutes drying times to the crystal that continues to move forward along with vibration on fluid bed; Utilize blower fan (2-15), filter (2-16) and cooling driers (2-17) to provide the wind of 15 DEG C of flow velocity 35m/s, pressure leak source 2-5 DEG C, temperature the crystal moving forward along with vibration on fluid bed to be implemented to the dry and cooling of 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 |
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