CN109987621A - A kind of drying process system of chlorination concentrated calcium solution - Google Patents
A kind of drying process system of chlorination concentrated calcium solution Download PDFInfo
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- CN109987621A CN109987621A CN201910184115.3A CN201910184115A CN109987621A CN 109987621 A CN109987621 A CN 109987621A CN 201910184115 A CN201910184115 A CN 201910184115A CN 109987621 A CN109987621 A CN 109987621A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/18—Evaporating by spraying to obtain dry solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/24—Chlorides
- C01F11/30—Concentrating; Dehydrating; Preventing the adsorption of moisture or caking
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The present invention provides a kind of drying process system of chlorination concentrated calcium solution, including material-transporting system and air feed system, and material-transporting system includes sequentially connected preconcentrator, one section of drying device, two-stage drying device and discharging device；One section of drying device includes spray drying tower, cyclone separator and returning charge machine, preconcentrator connects spray drying tower, spray drying tower, cyclone separator and returning charge machine are in turn connected to form cyclic drying circuit, the steam that concentrate separates can be discharged into preconcentrator by cyclone separator, and returning charge machine connects two-stage drying device；Calcium chloride dihydrate is dehydrated for anhydrous calcium chloride, and then by discharging device removal system by two-stage drying device；Air feed system includes hot-blast stove and tail gas absorber, and hot-blast stove is followed successively by two-stage drying device and spray drying tower hot wind supply；Preconcentrator connects tail gas absorber.The present invention controls the dehydration purity of calcium chloride using hot blast temperature, high to the utilization rate of hot wind, energy saving.
Description
Technical field
The invention belongs to technical field for the treatment of of organic waste, and in particular to a kind of drying process system of chlorination concentrated calcium solution
System.
Background technique
The industrial process of epoxychloropropane mainstream is propylene high-temperature chloridising at present, is produced in waste water containing a large amount of
Side product chlorinated calcium, if calcium chloride solution is extracted as anhydrous calcium chloride particle, can be used for preparing deicing salt, refrigerant,
The industrial products such as dehumidizer, dust-proofing agent, not only turn waste into wealth, and improve the economic benefit of enterprise, while can also reduce salt in waste water
The discharge divided provides a practicable solution for high-salt wastewater " zero-emission ".
Therefore the calcium chloride in the waste water containing calcium chloride generated in the production process of epoxychloropropane is carried out
It extracts, not only there is very important economic value, while also there is the very big value of environmental protection.Calcium chloride solution passes through falling liquid film
Purity can reach 60% after evaporation, and since its solution boiling point constantly increases, continuation concentrated cost is relatively high, need to use heated-air drying
Purification.However if only carrying out heated-air drying to the calcium chloride after concentration, without carrying out rational deployment to drying system, then can disappear
Mass energy is consumed, and the purity of calcium chloride is difficult to control.
Summary of the invention
The object of the present invention is to provide a kind of drying process systems of rationally distributed, saving heat energy chlorination concentrated calcium solution.
The present invention provides the following technical solutions:
A kind of drying process system of chlorination concentrated calcium solution, including material-transporting system and air feed system, material delivery system
System is for conveying calcium chloride solution and being dehydrated calcium chloride solution to form chlorination calcium particle；Air feed system is used to convey for material
The dewatering drying device of system provides hot wind；
Material-transporting system include successively by pipeline connection preconcentrator, one section of drying device, two-stage drying device and
Discharging device；
The preconcentrator is equipped with hot wind inlet, and the preconcentrator is for tentatively removing the grit and part water of stoste
Point, obtain chlorination concentrated calcium solution；
One section of drying device is for being dehydrated chlorination concentrated calcium solution for calcium chloride dihydrate, one section of drying device packet
Spray drying tower, cyclone separator and returning charge machine are included, the preconcentrator connects the import of the spray drying tower, described spraying
Drying tower, cyclone separator and returning charge machine are in turn connected to form cyclic drying circuit, and an outlet of the cyclone separator can incite somebody to action
One outlet of the steam discharge separated in concentrate, the returning charge machine connects the two-stage drying device；
Calcium chloride dihydrate is dehydrated for anhydrous calcium chloride, and then by discharging device removal system by the two-stage drying device；
The air feed system includes hot-blast stove and tail gas absorber, and the hot-blast stove is sequentially connected described two by air supply line
Section drying device and the spray drying tower, are successively the two-stage drying device and the spray drying tower hot wind supply；It is described
One outlet of cyclone separator connects the preconcentrator by air supply line, isolated steam is passed through preconcentrator dedusting, together
Concentration stock solution in Shi Jiare preconcentrator；
One outlet of the preconcentrator connects the tail gas absorber by air supply line.
Preferably, the air feed system further includes sequentially connected compressed air generator and compressed air reservoir, described
Concentration of the compressed air reservoir by pressing vacant duct to connect the feed inlet of the spray drying tower, to the spray drying tower is entered
Liquid is atomized.
Preferably, the two-stage drying device is pyrolysis furnace.
Preferably, the circulating temperature inside one section of drying device is 250 DEG C, and temperature is in the two-stage drying device
300℃。
Preferably, the preconcentrator is hydrofilter, hydrofilter include the wet dedusting tower that interconnects and
Sink, sink are located at below wet dedusting tower, and the hydrofilter tentatively removes in stoste while removing moisture to stoste
Impurity.
Preferably, the discharging device includes sequentially connected cooling roller and packing machine, the two-stage drying device
Discharge port connects the feed inlet of the cooling roller, and the cooling roller will be sent into packing machine after anhydrous calcium chloride cooling.
Preferably, the air feed system further includes pressure fan, and the pressure fan is separately connected the air inlet of the cooling roller
The air inlet of mouth and the hot-blast stove, provides natural wind for the cooling roller and the hot-blast stove.
Preferably, the air outlet of the cooling roller be separately connected the two-stage drying device, the spray drying tower and
The preconcentrator, the hot wind of cooling roller discharge can be by the two-stage drying devices, the spray drying tower and described
The recycling of wet dedusting tower.
Preferably, the cooling roller and the two-stage drying device, the spray drying tower and the wet dedusting tower
Regulating valve is separately installed on the pipeline of connection.
Preferably, the air feed system further includes circulating fan, and the circulating fan is installed on the two-stage drying device
Exhaust outlet and the hot-blast stove between, the hot wind that the two-stage drying device is discharged can be transported to described by the circulating fan
Hot-blast stove recycling.
The beneficial effects of the present invention are: the present invention is using high temperature two-period form drying mode production calcium chloride dihydrate and is granulated nothing
Water calcium chloride, one section of drying device use atomizing drying structure, and spray drying tower, cyclone separator and returning charge machine are sequentially connected
Cyclic drying circuit is formed, chlorination concentrated calcium solution high-pressure atomization is utilized the heated-air drying of air feed system by spray drying tower
Atomized liquid, efficiently removes the partial moisture in concentrate, and the steam that separated in concentrate can be discharged in time for cyclone separator
Cyclic drying circuit；The calcium chloride dihydrate of formation can be inputted in two-stage drying device and dehydration is further dried by returning charge machine, be obtained
Anhydrous calcium chloride.One outlet of cyclone separator connects preconcentrator by air supply line, by isolated superheated vapor by pre- dense
The dustiness of low exhaust gas emission drops in contracting device dedusting, while isolated steam can heat the concentration stock solution in preconcentrator, enhance
The thickening efficiency of preconcentrator, has saved energy consumption.The hot blast flow direction and flow direction of material contrary of air feed system of the invention, i.e.,
Hot wind is introduced into two-stage drying device, enters back into one section of drying device, subsequently into preconcentrator, therefore meets two-stage drying
Device, one section between drying device and preconcentrator to the demand of lapse of temperature, it is rationally distributed, be conducive to the drying to calcium chloride
Purification.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is one section of drying device structural schematic diagram of the invention；
In the figure, it is marked as 1. preconcentrators；2. one section of drying device；21. spray drying tower；22. cyclone separator；23.
Returning charge machine；3. two-stage drying device；4. discharging device；41. cooling roller；42. packing machine；5. hot-blast stove；6. tail gas absorber；
7. compressed air generator；8. compressed air reservoir；9. pressure fan；10. circulating fan.
Specific embodiment
As depicted in figs. 1 and 2, a kind of drying process system of chlorination concentrated calcium solution prepares ring for extracting chlorohydrination method
The calcium chloride in waste water that Ethylene Oxide generates, obtains anhydrous calcium chloride particle.This system generally comprise material-transporting system and
Air feed system, material-transporting system is for conveying calcium chloride solution and being dehydrated calcium chloride solution to form chlorination calcium particle；For
Wind system is used to provide hot wind for the dewatering drying device of material-transporting system.
Material-transporting system includes preconcentrator 1, one section of drying device 2, two-stage drying successively connected by material pipe
Device 3 and discharging device 4.
Preconcentrator 1 obtains chlorination concentrated calcium solution for tentatively removing the grit and partial moisture of stoste.Specifically, in advance
Inspissator 1 is hydrofilter, and hydrofilter includes the wet dedusting tower and sink interconnected, and sink is located at wet dedusting
Below tower, the dust in stoste is adsorbed in water first with sink, then stoste is pumped into wet dedusting tower upside from water tank,
Stoste is sprayed downwards using the high-pressure nozzle in wet dedusting tower, flows it from the bottom up, using in wet dedusting tower
The adsorbent filler remaining dust foreign particle of adsorbing and trapping again.In the process, hot wind is passed through to wet dedusting tower, heats wet process
Stoste in gas wash tower, to tentatively remove the partial moisture in stoste.
One section of drying device 2 is used to for chlorination concentrated calcium solution be dehydrated as calcium chloride dihydrate, and one section of drying device 2 is including being sprayed
Drying tower 21, cyclone separator 22 and returning charge machine 23, the import of the connection spray drying tower 21 of preconcentrator 1, spray drying tower 21,
Cyclone separator 22 and returning charge machine 23 are in turn connected to form cyclic drying circuit, and the temperature control in cyclic drying circuit is about 250
℃.The steam that separated in concentrate can be discharged for one outlet at 22 top of cyclone separator.Another outlet of returning charge machine 23 connects
Two-stage drying device 3.Chlorination concentrated calcium solution high-pressure atomization is utilized the heated-air drying mist of air feed system by spray drying tower 21
Change liquid, efficiently removes the partial moisture in concentrate, the steam that separated in concentrate can be discharged in time for cyclone separator 22
Cyclic drying circuit；The calcium chloride dihydrate of formation can be inputted in two-stage drying device 3 and dehydration is further dried by returning charge machine 23.
Two-stage drying device 3 is used to for calcium chloride dihydrate being dehydrated as anhydrous calcium chloride, the temperature control of two-stage drying device 3
It is about 300 DEG C.Specifically, two-stage drying device 3 is pyrolysis furnace, and pyrolysis furnace further removes organic inside calcium chloride dihydrate
Object.
Discharging device 4 includes sequentially connected cooling roller 41 and packing machine 42, and the discharge port of two-stage drying device 3 connects
The feed inlet of cooling roller 41, cooling roller 41 will be sent into packing machine 42 after the cooling of anhydrous calcium chloride particle.
Air feed system includes hot-blast stove 5 and tail gas absorber 6, and the fuel of hot-blast stove 5 is natural gas, and hot-blast stove 5 is by air feed
Pipeline is sequentially connected two-stage drying device 3 and spray drying tower 21, is successively 21 heat supply of two-stage drying device 3 and spray drying tower
Wind, it may be assumed that the high-temperature hot-air in hot-blast stove 5 first passes through two-stage drying device 3, is omited by becoming temperature after 3 use of two-stage drying device
Low secondary hot-air enters spray drying tower 21, therefore meets 300 DEG C, one section 250 DEG C of dryer section of two-stage drying section simultaneously
Temperature requirements；One outlet at 22 top of cyclone separator connects preconcentrator 1 by air supply line, by isolated steam by pre- dense
1 dedusting of contracting device, while isolated steam can heat the concentration stock solution in preconcentrator 1, improve the thickening efficiency of stoste, this mistake
Journey does not need consumption live steam, saves the gas consumption of preconcentrator.
One outlet of wet dedusting tower connects tail gas absorber 6, the steam formed in wet dedusting tower by air supply line
Into in tail gas absorber 6, by being discharged after the absorption organic matter of tail gas absorber 6 by chimney.Tap water accesses tail gas absorber
6, nebulization dust effect is provided for tail gas absorber 6.
Air feed system further includes sequentially connected compressed air generator 7 and compressed air reservoir 8, compressed air reservoir 8
The feed inlet that spray drying tower 21 is connected by pressure vacant duct, is atomized the concentrate for entering spray drying tower 21.
Air feed system further includes pressure fan 9, pressure fan 9 be separately connected cooling roller 41 air inlet and hot-blast stove 5 into
Air port, pressure fan 9 provide natural wind to cooling roller 41, improve the cooling efficiency of anhydrous calcium chloride particle；Pressure fan 9 is hot wind
Furnace 5 provides fresh natural wind, guarantees full combustion of fuel.
The air outlet of cooling roller 41 is separately connected two-stage drying device 3, spray drying tower 21 and preconcentrator 1, cooling
Roller 41 anhydrous calcium chloride cooling heat transferring is discharged the hot wind of certain temperature, the hot wind of the discharge can by two-stage drying device 3,
Spray drying tower 21 and the recycling of wet dedusting tower, save fuel consumption.
Pacify respectively on the pipeline that cooling roller 41 is connect with two-stage drying device 3, spray drying tower 21 and wet dedusting tower
It equipped with regulating valve, can need to adjust the aperture of each regulating valve according to the temperature of above each device, and then be mentioned for each device
For the hot wind of proper temperature.
Air feed system further includes circulating fan 10, and circulating fan 10 is installed on the exhaust outlet and hot wind of two-stage drying device 3
Between furnace 5.Since two-stage drying device 3 is run under the conditions of high temperature (300 DEG C), a large amount of high-temp waste gas, circulation are generated
The high-temp waste gas that two-stage drying device 3 is discharged can be transported to hot-blast stove 5 and reused again by blower 10, further decrease the energy
Consumption.
The course of work of this system are as follows: chlorination calcium stock solution tentatively removes water and impurity by feeding to be pumped into preconcentrator 1, shape
At chlorination concentrated calcium solution, chlorination concentrated calcium solution forms atomized liquid under the action of compressed air, into the spray of one section of drying device 2
Atomization drying is carried out in mist drying tower 21；Chlorination concentrated calcium solution is in spray drying tower 21, cyclone separator 22 and returning charge machine 23
It is atomized, dries, separates repeatedly under ringing, slough most of moisture, obtain the calcium chloride dihydrate that concentration is 77%；Returning charge machine
23 will carry out high temperature drying in calcium chloride dihydrate feeding two-stage drying device 3, obtain the anhydrous calcium chloride that concentration is 95%；It is anhydrous
After calcium chloride is by the cooling of cooling roller 41, packs and discharge into packing machine 42.
Corresponding air feed process are as follows: air and natural gas are admitted in hot-blast stove 5 and generate high-temperature hot-air, and high-temperature hot-air is advanced
Enter in two-stage drying device 3, guarantees that two-stage drying device 3 is run at a temperature of 300 DEG C；Two-stage drying device 3 is discharged secondary
Hot wind enter one section of drying device 2 spray drying tower 21 in, guarantee spray drying tower 21 250 DEG C at a temperature of run；One
The steam temperature still with higher that the cyclone separator 22 of section drying device 2 is isolated, isolated steam enter wet dedusting
In tower, wet dedusting tower is the steam dedusting, convenient for cleaning steam is discharged to atmosphere, while being removed using the waste heat of steam for wet process
Chimney hot wind supply, to improve the thickening efficiency of preconcentrator 1, effect between the two complements each other.In above procedure, two sections dry
Another air outlet of dry device 3 connects circulating fan 10, sends extra heat back to hot-blast stove 5 again by circulating fan 10
In, to reduce the dosage of natural gas；One air outlet of chilling roll 41 is separately connected two-stage drying device 3, spray drying tower 21
With preconcentrator 1, the hot wind that cooling heat transferring generates is respectively fed to heat supply in above three device, the energy is further saved and disappears
Consumption, and the hot blast rate of three air supply lines is adjustable, conveniently obtains the temperature for meeting process conditions.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although referring to aforementioned reality
Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features.It is all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of drying process system of chlorination concentrated calcium solution, which is characterized in that including material-transporting system and air feed system, institute
Material-transporting system is stated for conveying calcium chloride solution and being dehydrated calcium chloride solution to form chlorination calcium particle；The air feed system
System is for providing hot wind for the dewatering drying device of material-transporting system；
The material-transporting system include successively by pipeline connection preconcentrator, one section of drying device, two-stage drying device and
Discharging device；
The preconcentrator is equipped with hot wind inlet, and the preconcentrator is for tentatively removing grit and part water in stoste
Point, obtain chlorination concentrated calcium solution；
One section of drying device is used to for chlorination concentrated calcium solution be dehydrated as calcium chloride dihydrate, and one section of drying device is including spraying
Mist drying tower, cyclone separator and returning charge machine, the preconcentrator connect the import of the spray drying tower, the spray drying
Tower, the cyclone separator and the returning charge machine are in turn connected to form cyclic drying circuit, an outlet of the cyclone separator
The steam separated in concentrate can be discharged, an outlet of the returning charge machine connects the two-stage drying device；
Calcium chloride dihydrate is dehydrated for anhydrous calcium chloride, and then by discharging device removal system by the two-stage drying device；
The air feed system includes hot-blast stove and tail gas absorber, and the hot-blast stove is sequentially connected described two sections by air supply line and does
Dry device and the spray drying tower are successively the two-stage drying device and the spray drying tower hot wind supply；The whirlwind
One outlet of separator connects the preconcentrator by air supply line, isolated steam is passed through the preconcentrator dedusting, together
Concentration stock solution in preconcentrator described in Shi Jiare；
One outlet of the preconcentrator connects the tail gas absorber by air supply line.
2. a kind of drying process system of chlorination concentrated calcium solution according to claim 1, which is characterized in that the air feed system
System further includes sequentially connected compressed air generator and compressed air reservoir, and the compressed air reservoir is connected by pressure vacant duct
The feed inlet for connecing the spray drying tower is atomized the concentrate for entering the spray drying tower.
3. a kind of drying process system of chlorination concentrated calcium solution according to claim 2, which is characterized in that described two sections dry
Dry device is pyrolysis furnace.
4. a kind of drying process system of chlorination concentrated calcium solution according to claim 3, which is characterized in that a Duan Gan
Circulating temperature inside dry device is 250 DEG C, and temperature is 300 DEG C in the two-stage drying device.
5. a kind of drying process system of chlorination concentrated calcium solution according to claim 1, which is characterized in that the pre-concentration
Device is hydrofilter, and the hydrofilter includes the wet dedusting tower and sink interconnected, and the sink is located at described
Below wet dedusting tower, the hydrofilter tentatively removes the impurity in stoste while removing moisture to stoste.
6. a kind of chlorine cooling roller according to claim 4 and change calcium purity control system, which is characterized in that it is described go out
Material device includes sequentially connected cooling roller and packing machine, and the discharge port of the two-stage drying device connects the cooling roller
Feed inlet, the cooling roller will anhydrous calcium chloride it is cooling after be sent into the packing machine.
7. a kind of drying process system of chlorination concentrated calcium solution according to claim 6, which is characterized in that the air feed system
System further includes pressure fan, and the pressure fan is separately connected the air inlet of the cooling roller and the air inlet of the hot-blast stove, is
The cooling roller and the hot-blast stove provide natural wind.
8. a kind of drying process system of chlorination concentrated calcium solution according to claim 7, which is characterized in that the chill roll
The air outlet of cylinder is separately connected the two-stage drying device, the spray drying tower and the wet dedusting tower, the chill roll
The hot wind of cylinder discharge can be reused by the two-stage drying device, the spray drying tower and the wet dedusting tower.
9. a kind of drying process system of chlorination concentrated calcium solution according to claim 8, which is characterized in that the chill roll
Adjusting is separately installed on the pipeline that cylinder is connect with the two-stage drying device, the spray drying tower and the wet dedusting tower
Valve.
10. a kind of drying process system of chlorination concentrated calcium solution according to claim 4, which is characterized in that the air feed
System further includes circulating fan, the circulating fan be installed on the two-stage drying device exhaust outlet and the hot-blast stove it
Between, the hot wind that the two-stage drying device is discharged can be transported to the hot-blast stove and reused by the circulating fan.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910184115.3A CN109987621A (en) | 2019-03-12 | 2019-03-12 | A kind of drying process system of chlorination concentrated calcium solution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910184115.3A CN109987621A (en) | 2019-03-12 | 2019-03-12 | A kind of drying process system of chlorination concentrated calcium solution |
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| CN109987621A true CN109987621A (en) | 2019-07-09 |
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Application publication date: 20190709 |