CN111520975A - Industrial salt drying system and method - Google Patents
Industrial salt drying system and method Download PDFInfo
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- CN111520975A CN111520975A CN202010491441.1A CN202010491441A CN111520975A CN 111520975 A CN111520975 A CN 111520975A CN 202010491441 A CN202010491441 A CN 202010491441A CN 111520975 A CN111520975 A CN 111520975A
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- 238000001035 drying Methods 0.000 title claims abstract description 85
- 150000003839 salts Chemical class 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000428 dust Substances 0.000 claims abstract description 101
- 239000000463 material Substances 0.000 claims abstract description 84
- 238000012216 screening Methods 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 238000005453 pelletization Methods 0.000 claims abstract description 9
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 24
- 238000003860 storage Methods 0.000 claims description 20
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 17
- 235000011152 sodium sulphate Nutrition 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 13
- 239000002904 solvent Substances 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 7
- 230000004888 barrier function Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 28
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 238000009833 condensation Methods 0.000 abstract description 3
- 230000005494 condensation Effects 0.000 abstract description 3
- 150000003863 ammonium salts Chemical class 0.000 description 7
- 239000010446 mirabilite Substances 0.000 description 7
- 238000007599 discharging Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011555 saturated liquid Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G17/00—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface
- B65G17/30—Details; Auxiliary devices
- B65G17/32—Individual load-carriers
- B65G17/36—Individual load-carriers having concave surfaces, e.g. buckets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
- F26B25/007—Dust filtering; Exhaust dust filters
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention provides an industrial salt drying system and a method thereof, wherein the industrial salt drying system comprises a drying system, a screening and separating system and a dust removing system, the drying system comprises a dryer, the discharge end of the dryer is connected with a vibrating screen of the screening and separating system, the vibrating screen is provided with a dust removing port, the dust removing port is connected with the dust removing system, the vibrating screen is also provided with a fine material outlet and a coarse material outlet, and the coarse material outlet is connected with a plugging barrel through a pipeline. This scheme is effectual has improved dry effect, the while has reduced the dust that the material produced in dry separation process to the pollution of environment, preheat the material in advance before the drying, effectual drying effect and the efficiency that has promoted the material, the mass production of being convenient for, dust pelletizing system is effectual provides the negative pressure state among the dry separation process, be convenient for quick take out from dust and vapor, the condensation of vapor has been reduced, avoid the condensate water to influence product quality, the effectual production efficiency that has promoted.
Description
Technical Field
The invention relates to an industrial salt drying technology, in particular to an industrial salt drying system and a method thereof.
Background
The industrial salt is widely applied in industry and the using amount is very large, but the treatment such as water washing and drying is needed in the production process, particularly the drying problem of the crystalline is solved, and the quality problem of the industrial salt is directly influenced by the drying problem due to the large yield.
A process for separating mirabilite (sodium sulfate) by freezing and crystallizing it with saline solution is disclosed in Chinese patent No. CN101041444A, and includes such steps as regulating pH value, pre-cooling, controlling crystallizing temp at 0-10 deg.C, separating and recrystallizing. The technological process adopted by the method is that the mirabilite water is prepared into mirabilite containing crystal water, then the free water in the mirabilite is removed, and finally the mirabilite production technological process containing crystal water is obtained; the process method for preparing the mirabilite containing the crystal water has high energy consumption and low purity of the mirabilite, and is not beneficial to large-scale production.
The patent number CN108592611A discloses a steam rotary drying system for ammonium salt and a method for preparing ammonium salt, the steam rotary drying system is firstly used in an ammonium salt drying process, a new energy-saving and environment-friendly ammonium salt drying technology is provided, and the ammonium salt steam rotary drying system with less moisture carrying capacity, low product breakage rate, high heat efficiency, low power consumption, stable operation and energy conservation and the method for preparing ammonium salt are provided. The invention provides a steam rotary drying system for ammonium salt, which comprises a feeding device, a steam rotary dryer, a conveying device, a vibration conveying cooling screening machine and a tail gas dust removal device, wherein the steam rotary dryer comprises a feeding cover, a rotary cylinder, a discharging cover, a transmission device and a plurality of heat exchange tubes arranged in the rotary cylinder. The hot air intake of the steam rotary dryer is in a countercurrent mode.
However, in the use process of the system, the water vapor is easy to condense in the dryer, the condensed water vapor drops on dried salt to directly influence the quality and the drying effect of the product, and meanwhile, the system is easy to damage equipment in the use process, high in maintenance cost, not beneficial to the improvement of the production efficiency and irrational in dedusting effect.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an industrial salt drying system and method which are convenient for reducing the influence of water vapor condensation on products, improving the drying effect and the product quality, reducing the maintenance cost and facilitating mass production.
The technical scheme of the invention is as follows: the utility model provides an industrial salt drying system, includes drying system, screening separation system and dust pelletizing system, and drying system includes the desiccator, and the shale shaker of screening separation system is connected to the discharge end of desiccator, is equipped with the dust removal mouth on the shale shaker, and the dust pelletizing system is connected to the dust removal mouth, still be equipped with fine material export and coarse material export on the shale shaker, the coarse material export passes through pipe connection shutoff bucket.
The drying device has the advantages that the drying effect of the sodium sulfate can be effectively improved, negative pressure setting is adopted in the whole drying process, the influence of dust on the environment in the drying process is reduced, meanwhile, the water vapor generated in the drying process can be prevented from condensing, the influence on the product quality is avoided, the material can be conveniently screened and separated in the production process, the risk of material agglomeration is reduced, meanwhile, the screening and separating system can be in a negative pressure state through the dust removing system, the pollution of the dust on the environment is reduced, and the screening effect and quality are improved.
Furthermore, the plugging barrel comprises a barrel body and a solvent in the barrel body, the pipeline is always positioned below the liquid level of the solvent, and a return pipe is arranged on the barrel body.
Preferably, be equipped with the circulating pump on the back flow, be convenient for improve the flow of staving interior solution, improve the dissolution efficiency of material in the bucket, the solution after dissolving is discharged through the delivery pump, avoids solution too much to spill over the staving.
Furthermore, the drying system comprises a drying machine and a preheating chamber arranged at the front end of the drying machine, and the preheating chamber is connected with an air preheater.
Preferably, the air inlet of the preheating chamber is arranged at the lower end of the preheating chamber, so that hot air can be fully contacted with the materials, and meanwhile, the flowability of the materials can be improved; preferably, the preheating chamber is in a cylindrical shape, an air inlet of the preheating chamber is arranged in a tangent manner with the preheating chamber, so that hot air can rotate when entering the preheating chamber, and can drive materials to rotate together, so that the materials and the hot air are fully mixed, the flowing of the materials is facilitated, the blockage of a pipeline by the materials is prevented, the temperature of the hot air is 150-.
Further, the outlet end of the dryer is connected with the vibrating screen through a hose. The influence of the vibration of the vibrating screen on the dryer during the working process is reduced, the friction damage is avoided, and the damage to the connecting pipeline is reduced.
Furthermore, the drying machine comprises a shell and a heat exchange device arranged in the shell, the shell is connected with the tug boat device through a large gear arranged outside the shell, and the tug boat device drives the shell to rotate.
Preferably, heat transfer device includes intake pipe and outlet duct, and intake pipe and outlet duct are the ring form, form barrel-shaped structure through a plurality of branch connection between intake pipe and the outlet duct, and heat transfer device passes through the support mounting at the inner wall of casing, and the intake pipe is connected with the steam source, and the outlet duct is connected with the condenser, and the steam pressure that lets in the heat transfer device is 0.5MPa, can also adopt other steam pressure according to the needs of processing, the promotion of the drying effect of being convenient for.
Preferably, for promoting the area of contact between branch pipe and the material, the branch pipe is the heliciform along the casing inner wall and distributes, can also be the wave setting.
Further, the machine is carried to the thin material export through the pipe chute connection fill, and the discharge gate that the machine was carried to the fill is equipped with the buffer tank, and the lower extreme of buffer tank is equipped with the shunt tubes, and the export of shunt tubes includes first export and second export, and the first export is passed through conveyor material returning to preheating the indoor, and the second exit linkage powder flows the cooler.
Preferably, first export and second export all are equipped with solenoid electric valve, and solenoid electric valve can adjust the size of flow, is convenient for promote the effect of reposition of redundant personnel, avoids taking place to block up or the reposition of redundant personnel effect is poor.
More preferably, the relative one end of feed inlet end of machine is carried to the fill is equipped with the clearance mouth, when the fill is carried the trouble and need be overhauld, is convenient for clear away the material in the machine is carried to the fill, and easy access is convenient, is convenient for carry machine self to the fill simultaneously and clears up.
Further, the lower extreme of powder flow cooler is equipped with the three-way valve, and the storage jar is connected respectively to the export of three-way valve, and the three-way valve feed port end is equipped with emergent passageway, and emergent passageway communicates with one of them storage jar.
In the use, when the storage jar of lower extreme takes place to block up or transship, can slow down the material storage pressure of upper end through emergent passageway, prevent to block up powder and flow the cooler, the promotion of the powder of being convenient for flows cooler cooling effect.
Furthermore, a dust removal pipe is arranged on the storage tank, a barrier is arranged on the dust removal pipe, and an observation hole is further formed in the pipe wall of the dust removal pipe. Preferably, be equipped with on the observation hole and dismantle transparent baffle, be convenient for observe the production condition of dust in the dust removal pipe, can observe the effect of dust removal simultaneously, can also play the effect of pressure release, the balance of storage jar in pressure of being convenient for, the customs pass is used for controlling the dust removal work of dust removal pipe.
Further, dust pelletizing system includes cyclone, sack cleaner and draught fan, and cyclone passes through the dust removal pipe to be connected with the dust removal mouth, and the sack cleaner is passed through the pipe connection sack cleaner in the export of cyclone upper end, and the sack cleaner passes through the tuber pipe and connects the draught fan, still is equipped with the condenser between draught fan and the sack cleaner. In order to improve the dust removal effect, the cyclone dust collector is firstly adopted for preliminary dust removal, and then the bag-type dust collector is used for further dust removal, so that the air after dust removal can reach the emission standard, and the dust pollution to the air is facilitated
The industrial salt drying method for drying sodium sulfate by adopting the industrial salt drying system comprises the following steps:
firstly, adding materials, namely adding sodium sulfate with the water content of less than 3% into a dryer;
step two, drying, namely preheating the sodium sulfate in the step one in a preheating chamber, and drying the preheated material in a dryer;
thirdly, screening and separating, namely screening and separating the materials dried in the second step by a vibrating screen, dissolving the screened coarse materials for reuse, shunting the screened fine materials, returning one part of the materials to the feeding end of the dryer, and cooling and packaging the other part of the materials;
and fourthly, removing dust and dehumidifying, namely pumping out the water vapor and the dust generated in the drying process and the screening and separating process in the second step through a draught fan, removing dust through a dust removing device and dehumidifying through a condenser.
The invention has the following characteristics: this scheme is effectual has improved dry effect, the while has reduced the dust that the material produced in dry separation process to the pollution of environment, preheat the material in advance before the drying, effectual drying effect and the efficiency that has promoted the material, the mass production of being convenient for, dust pelletizing system is effectual provides the negative pressure state among the dry separation process, be convenient for quick take out from dust and vapor, the condensation of vapor has been reduced, avoid the condensate water to influence product quality, the effectual production efficiency that has promoted.
The detailed structure of the present invention will be further described with reference to the accompanying drawings and the detailed description.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic view of a shaker structure;
FIG. 4 is a schematic view of the dryer;
FIG. 5 is a schematic view of a heat exchange apparatus;
FIG. 6 is a schematic structural view of the bucket elevator;
FIG. 7 is a schematic view of a feed end structure of a bucket elevator;
FIG. 8 is a schematic view of a discharge end structure of the bucket elevator;
1-an air preheater, 2-a preheating chamber, 3-a dryer, 4-a tug unit, 5-a cover body, 6-a blocking barrel, 7-a vibrating screen, 8-a storage tank, 9-an emergency channel, 10-a powder flow cooler, 11-a screw conveyor, 12-a buffer tank, 13-a cyclone dust collector, 14-a bag dust collector, 15-a condenser, 16-an induced draft fan, 17-a bucket elevator, 18-a feed inlet, 19-a hot air conveying pipe, 20-a shell, 21-a dehumidifying and dedusting pipe, 22-a large gear, 23-a driving wheel, 24-a supporting seat, 25-a driving motor, 26-an air inlet pipe, 27-a branch pipe, 28-an air outlet pipe, 29-a driving motor, 30-a shell and 31-an inlet, 32-hopper, 33-outlet, 34-main shaft, 35-chain, 36-cleaning port, 37-auxiliary shaft, 38-stirrer, 39-stirring motor, 40-return pipe, 41-circulating pump, 42-automatic control switch and 43-conveying pump.
Detailed Description
As shown in the attached drawings: the utility model provides a sodium sulfate drying system, including drying system, screening separation system and dust pelletizing system, drying system includes desiccator 3, screening separation system includes shale shaker 7, shale shaker 7 is connected to desiccator 3's discharge end, be equipped with the dust removal mouth on the shale shaker 7, dust pelletizing system is connected to the dust removal mouth, still be equipped with fine material export and coarse fodder export on the shale shaker 7, the coarse fodder export passes through pipe connection shutoff bucket 6, shutoff bucket 6 includes the solvent in staving and the staving, the pipeline is located solvent liquid level below all the time, be equipped with back flow 40 on the staving.
Preferably, the return pipe 40 is provided with a circulating pump 41, which is convenient for improving the flow of the solution in the barrel body and the dissolving efficiency of the material in the barrel body, and the dissolved solution is discharged through a delivery pump 43, thereby avoiding the solution from overflowing the barrel body too much.
More preferably, the staving bottom can also set up agitating unit, agitating unit includes agitator 38 and agitator motor 39, agitator motor 39 drives the rotation of agitator 38, the distance between the lower extreme of agitator 38 and the staving bottom is at least 20cm, it stirs to the saturated liquid of lower extreme to be convenient for agitator 38, avoid forming crystal deposit and condense the piece, agitating unit is convenient for accelerate the dissolution of coarse fodder in shutoff bucket 6, for the volume of the interior solvent of bucket of remaining throughout, the staving is equipped with solvent automatic control switch 42, automatic opening when the solvent in the bucket falls to the lower limit of settlement adds the solvent, automatic closing when reaching the upper limit of settlement, the solvent is water or glycerine etc..
In the embodiment, the drying system comprises a dryer 3 and a preheating chamber 2 arranged at the front end of the dryer 3, and the preheating chamber 2 is connected with an air preheater 1 through a hot air delivery pipe 19.
Preferably, the air inlet of the preheating chamber 2 is arranged at the lower end of the preheating chamber, so that hot air can be fully contacted with the materials, and meanwhile, the flowability of the materials can be improved; preferably, the preheating chamber 2 is in a cylindrical shape, an air inlet of the preheating chamber 2 is arranged in a tangent manner with the preheating chamber 2, so that hot air can rotate when entering the preheating chamber 2, and simultaneously can drive materials to rotate together, so that the materials and the hot air are fully mixed, the flowing of the materials is facilitated, the materials are prevented from blocking a pipeline, the temperature of the hot air is 150 ℃, more preferably 120 ℃ and 146 ℃, most preferably 145 ℃, the temperature of the hot air is convenient to increase the temperature of the materials, and the loss of energy can be reduced.
The outlet end of the dryer 3 is connected to a vibrating screen 7 through a hose. The influence of the vibration of the vibrating screen 7 on the dryer 3 in the working process is reduced, the friction damage is avoided, and the damage to the connecting pipeline is reduced.
In the embodiment, the dryer 3 comprises a shell 20 and a heat exchange device arranged in the shell 20, the shell 20 is in a straight cylinder shape, the shell 20 is connected with the tug device 4 through a large gear 22 arranged outside the shell, the tug device 4 drives the shell 20 to rotate, in the use process, a driving motor 25 on the tug device 4 drives a driving wheel 23 arranged on the tug device 4 to work, the driving wheel 23 is meshed with the large gear 22 so as to drive the shell 20 to rotate, the shell 20 rotates, the driving wheel 23 and the driving motor 25 are both arranged on a supporting seat 24, so that the contact between materials and the heat exchange device is improved, the heat exchange effect is improved, and the material drying effect is improved; in order to improve the flowability of the materials in the shell 20, the shell 20 is inclined downwards by 1-5 degrees along the horizontal plane, so that the position of the feeding end is higher than that of the discharging end, the materials can automatically flow downwards due to the self gravity, and preferably, the inclination angle is 4 degrees; the efficiency of the drier 3 for drying materials is more than 40 tons/hour, the discharging end of the drier 3 is provided with a cover body 5, the upper end of the cover body 5 is provided with a dehumidifying and dedusting pipe 21, the lower end of the cover body 5 is a discharging port, and the discharging port is connected with a vibrating screen 7 through a pipeline.
Preferably, the heat exchange device comprises an air inlet pipe 26 and an air outlet pipe 28, the air inlet pipe 26 and the air outlet pipe 28 are both circular rings, the length of the shell 20 is more than 8m, materials can be dried sufficiently, the air inlet pipe 26 and the air outlet pipe 28 are connected through a plurality of branch pipes 27 to form a cylindrical structure, the heat exchange device is installed on the inner wall of the shell 20 through a support, the air inlet pipe 26 is connected with a steam source, the air outlet pipe 28 is connected with the condenser 15, the pressure of steam introduced into the heat exchange device is 0.5MPa, other steam pressures can be adopted according to the processing requirement, and the drying effect is improved conveniently; steam pressure should not be too high, can promote dry temperature when too high steam pressure, but can make heat transfer device's manufacturing cost higher, and steam pressure should not be low excessively, makes dry temperature not enough, is unfavorable for the promotion of drying efficiency.
Preferably, the branch pipes 27 are spirally distributed along the inner wall of the housing 20, or may be arranged in a wave shape, in order to increase the contact area between the branch pipes 27 and the material.
In the embodiment, the fine material outlet is connected with the hopper lifter 17 through an inclined pipe, the discharge port of the hopper lifter 17 is provided with a buffer tank 12, the lower end of the buffer tank is provided with a flow dividing pipe, the outlet of the flow dividing pipe comprises a first outlet and a second outlet, the first outlet returns the material into the preheating chamber 2 through a conveying device, the conveying device can be a screw conveyor 11, and the second outlet is connected with the powder flow cooler 10.
Preferably, first export and second export all are equipped with solenoid electric valve, and solenoid electric valve can adjust the size of flow, is convenient for promote the effect of reposition of redundant personnel, avoids taking place to block up or the reposition of redundant personnel effect is poor.
The bucket elevator 17 comprises a shell 30, a chain 35 and a hopper 32, a main shaft 34 is arranged at the upper end in the shell 30, a driven shaft 37 is arranged at the lower end in the shell 30, the main shaft 34 is connected with the driven shaft 37 through the chain 35, a plurality of hoppers 32 are arranged on the chain 35 at equal intervals, the main shaft 34 is driven by a transmission motor 29 arranged at the outer end of the shell 20, the driving chain 35 drives the hopper 32 to move, vertical conveying of materials is achieved, and a material outlet 33 and a material inlet 31 are arranged at the lower end of the shell 20.
More preferably, the opposite end of the inlet 31 end of the bucket elevator 17 is provided with a cleaning port 36, when the bucket elevator breaks down and needs to be overhauled, the materials in the bucket elevator 17 can be conveniently cleaned, the bucket elevator is convenient to overhaul, and the bucket elevator 17 can be conveniently cleaned.
In an embodiment, the lower end of the powder flow cooler 10 is provided with a three-way valve, the outlets of the three-way valve are respectively connected with the storage tanks, the inlet 18 end of the three-way valve is provided with an emergency channel 9, and the emergency channel 9 is communicated with one of the storage tanks.
In the use, when the storage jar of lower extreme takes place to block up or transship, can slow down the material storage pressure of upper end through emergent passageway 9, prevent to block up powder and flow cooler 10, the promotion of the powder of being convenient for and flowing cooler 10 cooling effect.
The storage tank is provided with a dust removal pipe, the dust removal pipe is provided with a barrier, and the pipe wall of the dust removal pipe is also provided with an observation hole. Preferably, be equipped with on the observation hole and dismantle transparent baffle, be convenient for observe the production condition of dust in the dust removal pipe, can observe the effect of dust removal simultaneously, can also play the effect of pressure release, the balance of storage jar in pressure of being convenient for, the customs pass is used for controlling the dust removal work of dust removal pipe.
In the embodiment, the dust removing system comprises a cyclone dust collector 13, a bag-type dust collector 14 and an induced draft fan 16, the cyclone dust collector 13 is connected with a dust removing opening through a dust removing pipe, an outlet at the upper end of the cyclone dust collector 13 is connected with the bag-type dust collector 14 through a pipeline, the bag-type dust collector 14 is connected with the induced draft fan 16 through an air pipe, and a condenser 15 is further arranged between the induced draft fan 16 and the bag-type dust collector 14. In order to improve the dust removal effect, the cyclone dust collector 13 is firstly adopted for preliminary dust removal, and then the bag-type dust collector 14 is used for further dust removal, so that the air after dust removal can reach the emission standard, and the dust pollution to the air is facilitated
The industrial salt drying method for drying sodium sulfate by adopting the industrial salt drying system comprises the following steps:
step one, adding materials, namely adding sodium sulfate with the moisture content of less than 3% into a dryer 3; sodium sulfate with the concentration lower than 3% is added into the dryer 3, so that the fluidity of the sodium sulfate is improved, and the drying efficiency of the sodium sulfate can be improved;
secondly, drying, namely preheating the sodium sulfate in the first step in a preheating chamber 2, and drying the preheated material in a dryer 3; the preheating chamber 2 is filled with hot air at the temperature of 100-150 ℃, so that the materials can be fully mixed with the hot air, the preheating effect is improved, meanwhile, the flowability of the materials can be improved, the feeding efficiency of the materials is improved, and the blocking of the materials caused by caking in the conveying process is reduced; the water vapor and dust generated in the drying process are extracted through the dust removal system, so that the water vapor can be prevented from being condensed in the dryer 3, and the product quality is improved conveniently;
thirdly, screening and separating, namely screening and separating the dried materials in the second step through a vibrating screen 7, dissolving the screened coarse materials for reutilization, shunting the screened fine materials, lifting the screened fine materials into a high-position cache tank 12 through a bucket elevator 17, shunting the fine materials from a discharge end of a buffer tank, returning one part of the fine materials to a feed end of the dryer 3 through a conveying device, cooling the other part of the fine materials through a powder flow cooler 10, storing the cooled fine materials in a storage tank, directly packaging the fine materials at the back, and arranging the storage tanks 8 in pairs so as to reduce the storage pressure and prevent blockage;
and fourthly, dedusting and dehumidifying, namely pumping out the water vapor and the dust generated in the drying process in the second step and the screening and separating process in the third step through a draught fan 16, dedusting through a dedusting device, and dehumidifying through a condenser 15.
Preferably, the dust removal system can also collect dust generated in the bucket elevator 17, the powder flow cooler 10 and the storage tank 8, so that the dust is prevented from polluting the environment, and the environmental protection is facilitated to be improved.
According to the scheme, the drying effect of the sodium sulfate is effectively improved, negative pressure setting is adopted in the whole drying process, the influence of dust on the environment in the drying process is reduced, meanwhile, water vapor generated in the drying process can be prevented from condensing, the influence on the product quality is avoided, the materials can be conveniently screened and separated in the production process, the risk of material agglomeration is reduced, meanwhile, the screening and separating system can be in a negative pressure state through the dust removal system, the pollution of the dust on the environment is reduced, the screening effect and quality are improved, and the sodium sulfate drying system can also be used for drying sodium chloride, calcium chloride and the like.
The above description is of the preferred embodiment of the present invention and the technical principles applied thereto, and it will be apparent to those skilled in the art that any changes and modifications based on the equivalent changes and simple substitutions of the technical solutions of the present invention are within the protection scope of the present invention without departing from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides an industrial salt drying system, includes drying system, screening separation system and dust pelletizing system, and drying system includes the desiccator, and the discharge end of desiccator is connected the shale shaker of screening separation system, is equipped with the dust removal mouth on the shale shaker, and dust pelletizing system, its characterized in that are connected to the dust removal mouth: the vibrating screen is also provided with a fine material outlet and a coarse material outlet, and the coarse material outlet is connected with the plugging barrel through a pipeline.
2. The industrial salt drying system of claim 1, wherein: the plugging barrel comprises a barrel body and a solvent in the barrel body, the pipeline is always positioned below the liquid level of the solvent, and a return pipe is arranged on the barrel body.
3. The industrial salt drying system of claim 1, wherein: the drying system comprises a drying machine and a preheating chamber arranged at the front end of the drying machine, and the preheating chamber is connected with an air preheater.
4. The industrial salt drying system of claim 3, wherein: the outlet end of the dryer is connected with the vibrating screen through a hose.
5. The industrial salt drying system of claim 4, wherein: the dryer comprises a shell and a heat exchange device arranged in the shell, wherein the shell is connected with a tug boat device through a large gear arranged outside the shell, and the tug boat device drives the shell to rotate.
6. The industrial salt drying system of claim 1, wherein: the machine is carried to the thin material export hopper through the pipe chute connection, and the discharge gate that the machine was carried to the hopper is equipped with the buffer tank, and the lower extreme of buffer tank is equipped with the shunt tubes, and the export of shunt tubes includes first export and second export, and first export is passed through conveyor returning charge and is preheated indoor, and second exit linkage powder flows the cooler.
7. The industrial salt drying system of claim 6, wherein: the lower extreme of powder flow cooler is equipped with the three-way valve, and the storage jar is connected respectively to the export of three-way valve, and three-way valve feed port end is equipped with emergent passageway, and emergent passageway communicates with one of them storage jar.
8. The industrial salt drying system of claim 7, wherein: the storage tank is provided with a dust removal pipe, the dust removal pipe is provided with a barrier, and the pipe wall of the dust removal pipe is also provided with an observation hole.
9. The industrial salt drying system of any one of claims 1 to 8, wherein: the dust removal system comprises a cyclone dust collector, a bag-type dust collector and an induced draft fan, the cyclone dust collector is connected with a dust removal opening through a dust removal pipe, an outlet at the upper end of the cyclone dust collector is connected with the bag-type dust collector through a pipeline, the bag-type dust collector is connected with the induced draft fan through an air pipe, and a condenser is further arranged between the induced draft fan and the bag-type dust collector.
10. A method for drying industrial salt, wherein the drying system for industrial salt according to any one of claims 1 to 9 is used for drying sodium sulfate, comprising the following steps:
firstly, adding materials, namely adding sodium sulfate with the water content of less than 3% into a dryer;
step two, drying, namely preheating the sodium sulfate in the step one in a preheating chamber, and drying the preheated material in a dryer;
thirdly, screening and separating, namely screening and separating the materials dried in the second step by a vibrating screen, dissolving the screened coarse materials for reuse, shunting the screened fine materials, returning one part of the materials to the feeding end of the dryer, and cooling and packaging the other part of the materials;
and fourthly, removing dust and dehumidifying, namely pumping out the water vapor and the dust generated in the drying process and the screening and separating process in the second step through a draught fan, removing dust through a dust removing device and dehumidifying through a condenser.
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Cited By (1)
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| CN114453254A (en) * | 2021-12-21 | 2022-05-10 | 上海电气集团股份有限公司 | Automatic powder screening device |
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Application publication date: 20200811 |