CN110240181A - A kind of dehydration and drying system and method freezing saltcake - Google Patents
A kind of dehydration and drying system and method freezing saltcake Download PDFInfo
- Publication number
- CN110240181A CN110240181A CN201910489173.7A CN201910489173A CN110240181A CN 110240181 A CN110240181 A CN 110240181A CN 201910489173 A CN201910489173 A CN 201910489173A CN 110240181 A CN110240181 A CN 110240181A
- Authority
- CN
- China
- Prior art keywords
- saltcake
- rotating cylinder
- dehydration
- scraper
- drying system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 title claims abstract description 86
- 238000001035 drying Methods 0.000 title claims abstract description 25
- 230000018044 dehydration Effects 0.000 title claims abstract description 22
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 22
- 230000008014 freezing Effects 0.000 title claims abstract description 16
- 238000007710 freezing Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 22
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 22
- 238000002425 crystallisation Methods 0.000 claims abstract description 12
- 230000008020 evaporation Effects 0.000 claims abstract description 5
- 238000001704 evaporation Methods 0.000 claims abstract description 5
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000010962 carbon steel Substances 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 239000011651 chromium Substances 0.000 claims abstract description 4
- 238000007747 plating Methods 0.000 claims abstract description 4
- WBZKQQHYRPRKNJ-UHFFFAOYSA-L disulfite Chemical compound [O-]S(=O)S([O-])(=O)=O WBZKQQHYRPRKNJ-UHFFFAOYSA-L 0.000 claims description 12
- 230000008025 crystallization Effects 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000009834 vaporization Methods 0.000 claims description 3
- 230000008016 vaporization Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 13
- 239000002918 waste heat Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 9
- -1 papermaking Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 206010054949 Metaplasia Diseases 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000015689 metaplastic ossification Effects 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- WBHQBSYUUJJSRZ-UHFFFAOYSA-N sodium;sulfuric acid Chemical compound [H+].[H+].[Na+].[O-]S([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-N 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/18—Dehydration
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The present invention relates to a kind of dehydration and drying system and methods for freezing saltcake, comprising: nitre tank, blender, heat exchange coil, delivery pump, hopper, rotating cylinder, scraper, screw conveyor, gas gathering mask, drain valve and wet-emitting blower；Rotating cylinder is rolled using thick carbon steel plate and is welded, outer surface chromium plating；Scraper is mainly made of scraper, scraper frame and spring.The beneficial effects of the present invention are: present invention process system is simple, occupied area is small compared with traditional multiple-effect evaporation crystallisation, economy is more excellent, suitable for small-scale saltcake desiccation anhydrous sodium sulphate；Gas gathering mask and wet-emitting blower of the invention is used to collect the secondary steam that emptying desiccation saltcake generates, and the sodium sulphate after avoiding desiccation gets damp；The present invention utilizes the high-temperature steam condensed water formed after low-pressure steam heated drums, enters to melt in nitre tank after drain valve and heats saltcake as heat source, makes full use of waste heat, have high thermal efficiency.
Description
Technical field
The present invention relates to the dehydration and drying system and methods of freezing saltcake, belong to waste water zero-discharge technology field.
Background technique
Freezing and crystallizing is one of the conventional process of current Industry Waste moisture salt zero-emission, which is saltcake (ten water
Sodium sulphate).After saltcake removes ten crystallizations water, it is anhydrous sodium sulphate (anhydrous sodium sulfate or thenardite).Saltcake and anhydrous sodium sulphate, extensively
Applied to industries such as detergent, papermaking, medicine and glass industries.But compared with anhydrous sodium sulphate, saltcake is in the presence of not easy to maintain, price is low
Honest and clean, the disadvantages of freight is high, it is necessary to by saltcake desiccation be outer again after anhydrous sodium sulphate sell.
Traditional saltcake anhydrous sodium sulphate technique is mainly multiple-effect evaporation crystallisation, which is suitable for large-scale industry metaplasia
Anhydrous sodium sulphate is produced, relates generally to melt nitre tank, heater, crystal separator, thickener, mother liquor tank, centrifuge, vibra fluidized bed drying
The equipment such as machine, vacuum system, steam condensate tank, all kinds of pumps, there are system flow complexity, take up a large area, high investment etc.
Problem.Therefore, it is resource utilization crystal salt, improves last ring in Industry Waste moisture salt zero-discharge technology route, need
Research and develop that a kind of system is simple, occupied area is small, economy more preferably saltcake drying process.
Summary of the invention
The purpose of the present invention is overcoming deficiency in the prior art, provide that a kind of system is simple, occupied area is small, economy
More preferably freeze the dehydration and drying system and method for saltcake.
The dehydration and drying system of this freezing saltcake, including melt nitre tank, blender, heat exchange coil, delivery pump, hopper, turn
Cylinder, scraper, screw conveyor, gas gathering mask, drain valve and wet-emitting blower；Melt and is equipped with blender and heat exchange coil in nitre tank；Melt nitre
Tank output end connects the input terminal of hopper by delivery pump, and hopper top is equipped with rotating cylinder；Rotating cylinder top is equipped with gas gathering mask, gas gathering mask
Top is equipped with wet-emitting blower；Rotating cylinder side is equipped with scraper, and scraper lower end is equipped with screw conveyor；The output end of rotating cylinder passes through hydrophobic
The input terminal of valve connection heat exchange coil.
As preferred: rotating cylinder is rolled using thick carbon steel plate and is welded, outer surface chromium plating.
As preferred: scraper is mainly made of scraper, scraper frame and spring.
The dehydration and drying method of the dehydration and drying system of the freezing saltcake, comprising the following steps:
1) centrifuge supplied materials saltcake solid is dissolved in itself crystallization water, is formed high by melting nitre tank heating stirring process
Concentration metabisulfite solution；
2) metabisulfite solution is pumped to hopper through conveying, and submerges cylinder bottom；
3) rotating cylinder of steam is passed through under transmission device driving by defined rotational speed, forms sodium sulphate on rotating cylinder wall surface
Liquid film, barrel, which conducts heat, makes the moisture vaporization of liquid film, then is scraped by the sodium sulphate that scraper is up to dry requirement, passes through spiral transferring
It send machine to discharge, obtains anhydrous sodium sulfate；
4) vapor that sodium sulphate liquid film evaporation is formed, is directly emitted into atmosphere by the wet-emitting blower at the top of gas gathering mask.
As preferred: in the step 1), saltcake solid melt in nitre tank be heated be dissolved in itself crystallization water, formed
It is saturated metabisulfite solution, a small amount of water is added to make to be precipitated in tank without solid sodium sulfate.
As preferred: in the step 3), using the high-temperature steam condensed water formed after steam heated drums, through drain valve
Enter to melt in nitre tank afterwards and heat saltcake as heat source, so that it is lost the crystallization water and form metabisulfite solution, high-temperature steam condensed water
Become Low Temperature Steam condensed water after heat exchange coil.
As preferred: in the step 3), steam enters inside rotating cylinder from rotary joint rear portion, and heat is passed through drum wall
It conducts to the metabisulfite solution of rotating cylinder outer surface, formation high-temperature steam condensed water is gathered in cylinder bottom after discharging latent heat, utilizes
Pressure difference in cylinder between steam pressure and the outer drain valve of cylinder, is discharged by the siphon pipe of cylinder bottom from rotary joint front end.
As preferred: in the step 4), gas gathering mask and wet-emitting blower collect the secondary steam that emptying desiccation saltcake generates.
The beneficial effects of the present invention are:
1, compared with traditional multiple-effect evaporation crystallisation, present invention process system is simple, occupied area is small, economy is more excellent,
Suitable for small-scale saltcake desiccation anhydrous sodium sulphate.
2, gas gathering mask of the invention and wet-emitting blower are used to collect the secondary steam that emptying desiccation saltcake generates, and avoid dry
Sodium sulphate after change gets damp.
3, the present invention enters after drain valve using the high-temperature steam condensed water formed after low-pressure steam heated drums and melts nitre
Saltcake is heated as heat source in tank, makes full use of waste heat, there is high thermal efficiency.
Detailed description of the invention
Fig. 1 is the process flow diagram of this patent；
Description of symbols: 1- melts nitre tank；2- blender；3- heat exchange coil；4- delivery pump；5- hopper；6- rotating cylinder；7- is scraped
Knife；8- screw conveyor；9- gas gathering mask；10- drain valve；11- wet-emitting blower.
Specific embodiment
The present invention is described further below with reference to embodiment.The explanation of following embodiments is merely used to help understand this
Invention.It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, also
Can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the protection scope of the claims in the present invention
It is interior.
The dehydration and drying system of the freezing saltcake, including melt nitre tank 1, blender 2, heat exchange coil 3, delivery pump 4, material
Slot 5, rotating cylinder 6, scraper 7, screw conveyor 8, gas gathering mask 9, drain valve 10 and wet-emitting blower 11.Melt and is equipped with blender 2 in nitre tank 1
With heat exchange coil 3；Melt the input terminal that 1 output end of nitre tank connects hopper 5 by delivery pump 4,5 top of hopper is equipped with rotating cylinder 6；Rotating cylinder
6 tops are equipped with gas gathering mask 9, are equipped with wet-emitting blower 11 at the top of gas gathering mask 9；6 side of rotating cylinder is equipped with scraper 7, and 7 lower end of scraper is equipped with spiral shell
Revolve conveyer 8；The output end of rotating cylinder 6 connects the input terminal of heat exchange coil 3 by drain valve 10.
Centrifuge supplied materials saltcake solid is dissolved in itself crystallization water during melting nitre 1 heating stirring of tank, is added few
It measures water and forms 32.6wt% saturation metabisulfite solution, solution temperature is controlled at 40 ± 2 DEG C；Sodium sulphate saturated solution is through delivery pump 4
It continuously send to hopper 5, and submerges 6 bottom of rotating cylinder；The rotating cylinder 6 for being passed through low-pressure steam (0.3~0.5MPa) drives in transmission device
2~4r/min rotational speed is pressed down, and the sodium sulphate liquid film of 0.5~1.0mm, barrel (wall surface temperature 110 are formed on 6 wall surface of rotating cylinder
~130 DEG C) conducting heat makes the moisture vaporization of liquid film, and after 10~15s, the sodium sulphate powder being bonded on barrel is scraped by scraper 7
Under, it is discharged by screw conveyor 8, obtains anhydrous sodium sulfate.
Saltcake solid is dissolved in itself crystallization water melting to be heated in nitre tank 1, forms supersaturated metabisulfite solution, it is only necessary to add
A small amount of water makes to be precipitated in tank without solid sodium sulfate, and energy consumption is reduced from source.
This process makes full use waste heat has high thermal efficiency.Melt nitre tank 1 and heat exchange coil 3 and blender 2 are set, utilization is low
The high-temperature steam condensed water (70~80 DEG C of temperature) formed after pressure steam (0.3~0.5MPa) heated drums 6, after drain valve 10
Saltcake is heated as heat source into melting in nitre tank 1, high-temperature steam condensed water becomes Low Temperature Steam condensation after heat exchange coil 3
Water.
Rotating cylinder 6 is rolled using thick carbon steel plate and is welded, outer surface chromium plating；By adjusting rotating cylinder revolving speed, to control out
Expect degree of drying.
Steam enters inside rotating cylinder 6 from rotary joint rear portion, and heat is conducted by drum wall to the sulfuric acid of cylinder outer surface
Sodium solution discharges and forms steam condensate (SC) after latent heat and be gathered in 6 bottom of rotating cylinder, using drain valve outside steam pressure in cylinder and cylinder it
Between pressure difference, be discharged by the siphon pipe of cylinder body bottom from rotary joint front end.
Gas gathering mask 9 and wet-emitting blower 11 are used to collect the secondary steam that emptying desiccation saltcake generates, the sulphur after avoiding desiccation
Sour sodium gets damp.
Scraper is made of components such as scraper 7, scraper frame, springs.The angle of scraper 7 is adjustable, and setting as far as possible exists
Tangential direction loading and unloading material, scraper not with cylinder friction, with antisitic defect scraper.
The setting angle of stock guide is greater than angle of repose.
Claims (8)
1. a kind of dehydration and drying system for freezing saltcake, it is characterised in that: including melting nitre tank (1), blender (2), heat exchange coil
(3), delivery pump (4), hopper (5), rotating cylinder (6), scraper (7), screw conveyor (8), gas gathering mask (9), drain valve (10) and row
Wet blower (11)；Melt and is equipped with blender (2) and heat exchange coil (3) in nitre tank (1)；Melt nitre tank (1) output end and passes through delivery pump (4)
The input terminal of hopper (5) is connected, hopper (5) top is equipped with rotating cylinder (6)；Rotating cylinder (6) top is equipped with gas gathering mask (9), gas gathering mask (9)
Top is equipped with wet-emitting blower (11)；Rotating cylinder (6) side is equipped with scraper (7), and scraper (7) lower end is equipped with screw conveyor (8)；Rotating cylinder
(6) input terminal that output end passes through drain valve (10) connection heat exchange coil (3).
2. the dehydration and drying system of freezing saltcake according to claim 1, it is characterised in that: rotating cylinder (6) is using thick carbon steel
Coiled sheet system is welded, outer surface chromium plating.
3. the dehydration and drying system of freezing saltcake according to claim 1, it is characterised in that: scraper is mainly by scraper
(7), scraper frame and spring composition.
4. a kind of dehydration and drying method of the dehydration and drying system of freezing saltcake as described in claim 1, it is characterised in that: packet
Include following steps:
1) centrifuge supplied materials saltcake solid is dissolved in itself crystallization water, is formed high by melting nitre tank (1) heating stirring process
Concentration metabisulfite solution；
2) metabisulfite solution is sent through delivery pump (4) to hopper (5), and submerges rotating cylinder (6) bottom；
3) rotating cylinder (6) of steam is passed through under transmission device driving by defined rotational speed, forms sulfuric acid on rotating cylinder (6) wall surface
Sodium liquid film, barrel, which conducts heat, makes the moisture vaporization of liquid film, then is scraped by the sodium sulphate that scraper (7) are up to dry requirement, passes through
Screw conveyor (8) discharging, obtains anhydrous sodium sulfate；
4) vapor that sodium sulphate liquid film evaporation is formed, is directly emitted into atmosphere by the wet-emitting blower (11) at the top of gas gathering mask (9)
In.
5. the dehydration and drying method of the dehydration and drying system of freezing saltcake according to claim 4, it is characterised in that: described
In step 1), saltcake solid is dissolved in itself crystallization water melting to be heated in nitre tank (1), is formed supersaturated metabisulfite solution, is added
A small amount of water makes to be precipitated in tank without solid sodium sulfate.
6. the dehydration and drying method of the dehydration and drying system of freezing saltcake according to claim 4, it is characterised in that: described
In step 3), the high-temperature steam condensed water formed afterwards using steam heated drums (6) is entered after drain valve (10) and melts nitre tank
(1) saltcake is heated as heat source in, so that it is lost the crystallization water and forms metabisulfite solution, high-temperature steam condensed water passes through heat exchange plate
Become Low Temperature Steam condensed water after pipe (3).
7. the dehydration and drying method of the dehydration and drying system of freezing saltcake according to claim 4, it is characterised in that: described
In step 3), steam enters rotating cylinder (6) inside from rotary joint rear portion, and heat is conducted by drum wall to rotating cylinder outer surface
Metabisulfite solution, formation high-temperature steam condensed water is gathered in rotating cylinder (6) bottom after discharging latent heat, utilizes steam pressure in cylinder and cylinder
Pressure difference between outer drain valve is discharged by the siphon pipe of rotating cylinder (6) bottom from rotary joint front end.
8. the dehydration and drying method of the dehydration and drying system of freezing saltcake according to claim 4, it is characterised in that: described
In step 4), gas gathering mask (9) and wet-emitting blower (11) collect the secondary steam that emptying desiccation saltcake generates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910489173.7A CN110240181A (en) | 2019-06-06 | 2019-06-06 | A kind of dehydration and drying system and method freezing saltcake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910489173.7A CN110240181A (en) | 2019-06-06 | 2019-06-06 | A kind of dehydration and drying system and method freezing saltcake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110240181A true CN110240181A (en) | 2019-09-17 |
Family
ID=67886172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910489173.7A Pending CN110240181A (en) | 2019-06-06 | 2019-06-06 | A kind of dehydration and drying system and method freezing saltcake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110240181A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115744935A (en) * | 2022-09-30 | 2023-03-07 | 常州江南冶金科技有限公司 | Process for improving purity of sodium sulfate |
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| CN115744935A (en) * | 2022-09-30 | 2023-03-07 | 常州江南冶金科技有限公司 | Process for improving purity of sodium sulfate |
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