CN112569630A - Calcium chloride solution concentration and crystallization system - Google Patents
Calcium chloride solution concentration and crystallization system Download PDFInfo
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- CN112569630A CN112569630A CN202011430390.8A CN202011430390A CN112569630A CN 112569630 A CN112569630 A CN 112569630A CN 202011430390 A CN202011430390 A CN 202011430390A CN 112569630 A CN112569630 A CN 112569630A
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- calcium chloride
- chloride solution
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0018—Evaporation of components of the mixture to be separated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/06—Flash distillation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/004—Fractional crystallisation; Fractionating or rectifying columns
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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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- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a calcium chloride solution concentration and crystallization system, which comprises a feeding working section, an evaporation working section, a flaker, a hot air fluidized bed and a packing machine which are sequentially connected through a feeding pipeline and a conveyor belt; the feeding section comprises a calcium chloride solution temporary storage container and a raw material liquid preheater, and the raw material liquid preheater is arranged on a feeding pipeline connecting the temporary storage container and the evaporation section; the evaporation section comprises a four-effect negative pressure evaporator, a two-effect evaporator, a three-effect negative pressure evaporator, a one-effect evaporator, a calcium-making one-effect evaporator and a flash tank which are sequentially connected through a feeding pipeline, wherein the calcium-making one-effect evaporator and the flash tank are respectively connected with fresh steam through fresh steam pipelines, and secondary steam generated in the heating process is used as a heat source of other equipment. Through the mode, the invention can reduce the heat dissipation speed in the system, fully utilize the steam heat source, obviously reduce the energy consumption of the whole production system, improve the production efficiency and reduce the production cost.
Description
Technical Field
The invention relates to the field of calcium chloride concentration and recovery, in particular to a calcium chloride solution concentration and crystallization system.
Background
In the production process of chemical products, chemical enterprises often have hydrochloric acid as a byproduct, the byproduct hydrochloric acid usually contains a large amount of impurities, so the byproduct hydrochloric acid cannot be directly sold or discharged, the cost for directly performing innocent treatment on the waste acid is too high, the chemical enterprises are difficult to bear, and in order to solve the contradiction, well-known three-blessing chemical companies develop a method (CN 105129832B) for continuously producing liquid calcium chloride by utilizing the byproduct hydrochloric acid, the method can be used for continuously producing the liquid calcium chloride, the requirement for treating the byproduct hydrochloric acid in large batch is met, but the produced liquid calcium chloride occupies a large space, is limited in application range and needs to be further processed into solid, and the conventional calcium chloride concentration and crystallization production line has high production efficiency, but consumes large energy, and cannot fully utilize the energy in the system for the second time.
Disclosure of Invention
The invention mainly solves the technical problem of providing a calcium chloride solution concentration and crystallization system which can reduce energy consumption in calcium chloride solid production and reduce production cost.
In order to solve the technical problems, the invention adopts a technical scheme that: providing a calcium chloride solution concentration and crystallization system, wherein the calcium chloride solution concentration and crystallization system comprises a feeding working section, an evaporation working section, a flaker, a hot air fluidized bed and a packing machine which are sequentially connected through a feeding pipeline and a conveying belt; the feeding section comprises a calcium chloride solution temporary storage container and a steam heat exchanger, and the steam heat exchanger is arranged on a feeding pipeline connecting the temporary storage container and the evaporation section; the evaporation section comprises a four-effect negative pressure evaporator, a two-effect evaporator, a three-effect negative pressure evaporator, a one-effect evaporator, a calcium-making one-effect evaporator and a flash tank which are sequentially connected through a feeding pipeline, wherein the calcium-making one-effect evaporator and the flash tank are respectively connected with fresh steam through fresh steam pipelines, part of secondary steam generated by the calcium-making one-effect evaporator and part of secondary steam generated by the flash tank are connected with the one-effect evaporator through corresponding secondary steam pipelines after being dewatered by a steam trap, the secondary steam generated by the one-effect evaporator is connected with a raw material liquid preheater through pipelines, the rest part of the secondary steam generated by the flash tank is connected with a sheeting apparatus through a secondary steam pipeline, and the residual heat steam generated after being cooled by the sheeting apparatus is sequentially connected with the two-effect evaporator and the three-effect negative pressure evaporator and then enters a washing bucket through; the calcium chloride solution is preheated by a raw material liquid preheater from a calcium chloride solution temporary storage container, and is subjected to continuous evaporation to remove moisture by an evaporation section to obtain a critical concentrated calcium chloride solution, the critical concentrated calcium chloride solution enters a flaker through a feed pipeline and is condensed into calcium chloride salt crystals on a rotary drum of the flaker, the calcium chloride salt crystals are scraped from the rotary drum of the flaker through a scraper device and directly enter a hot air fluidized bed through a feed opening to be subjected to hot air drying, the dried calcium chloride is conveyed to a packaging section through a conveying belt, and a finished product is obtained after the dried calcium chloride is packaged in a packaging machine.
In a preferred embodiment of the invention, the high-temperature steam generated by the calcium chloride solution evaporating in the first-effect evaporator enters the second-effect evaporator to preheat the second-effect evaporator, then is mixed with the high-temperature steam newly generated in the second-effect evaporator, finally is converged with the high-temperature steam generated in the first-effect evaporator for calcium preparation and enters the third-effect negative-pressure evaporator, and the steam generated in the third-effect negative-pressure evaporator and the preheated third-effect negative-pressure evaporator are connected into the water washing barrel together after passing through the surface condenser and the steam-water separator.
In a preferred embodiment of the invention, high-temperature steam generated in the flash tank by the calcium chloride solution enters a heating chamber of the four-effect negative-pressure evaporator, and the heated four-effect negative-pressure evaporator and the steam generated by the four-effect negative-pressure evaporator are connected into the water washing barrel after passing through the surface condenser and the steam-water separator.
In a preferred embodiment of the invention, the hot air fluidized bed is a gas hot air fluidized bed, and comprises a hot air fluidized bed body, a combustion chamber, an air inducing device and a calcium chloride absorption tower, external air is blown into the combustion chamber by a blower to be combusted and heated to form hot air, the hot air enters the bottom of the hot air fluidized bed, moisture among calcium chloride crystals is evaporated by utilizing the heat of the hot air, then mixed gas is introduced into the calcium chloride absorption device from the hot air fluidized bed through the air inducing device arranged above the fluidized bed, and residual gas is discharged into the atmosphere after calcium chloride dust is absorbed by an aqueous solution in the calcium chloride absorption device.
In a preferred embodiment of the invention, the air inlet of the combustion chamber is provided with an air heat exchanger.
In a preferred embodiment of the invention, the air heat exchanger is connected with the raw material liquid preheater, the waste heat steam generated by the raw material liquid preheater is used for preheating the outside air, and the waste heat steam generated by the raw material liquid preheater enters the air heat exchanger for heat exchange and then enters the condensation water bucket.
In a preferred embodiment of the invention, the packaging machine is also provided with an induced draft fan, and the induced draft fan is connected with the calcium chloride absorption device.
In a preferred embodiment of the invention, the absorption liquid in the calcium chloride absorption device is added into the calcium chloride solution temporary storage container as a raw material liquid after the concentration of the absorption liquid exceeds 30%.
In a preferred embodiment of the present invention, the calcium chloride absorption device comprises two calcium chloride absorption towers connected in series.
In a preferred embodiment of the invention, the two calcium chloride absorption towers connected in series are used as raw material liquid to be added into the calcium chloride temporary storage container after the concentration of the absorption liquid in the first absorption tower reaches the standard in the absorption process, and then the absorption liquid with lower concentration in the second absorption tower is used as mother liquid to be added into the first absorption tower.
The invention has the beneficial effects that: according to the invention, the existing calcium chloride concentration and crystallization process is improved, the flow direction of secondary steam generated in the evaporation process is controlled, so that the waste heat in the steam is fully utilized, the total consumption of high-temperature steam in the system is obviously reduced, the energy consumption of the system is reduced, the consumption of 1.5MPa high-temperature steam per ton of finished products in the process of processing a 30% calcium chloride solution into the solid products by the production line before the improvement is about 2.2 tons through actual measurement, the consumption of 1.5MPa high-temperature steam per ton of finished products by the production line after the improvement is only about 1.2 tons, and the production benefit of the whole production line is obviously improved.
Drawings
FIG. 1 is a schematic view of the material flow in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic view of the external steam flow in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic view of the internal steam flow in accordance with a preferred embodiment of the present invention;
the arrows indicate the direction of flow of the steam or material.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to fig. 1 to 3, an embodiment of the present invention includes:
a calcium chloride solution concentration system comprises a feeding working section, an evaporation working section, a flaker, a hot air fluidized bed and a packing machine which are sequentially connected through a feeding pipeline and a material conveying belt; the feeding section comprises a calcium chloride solution temporary storage container and a raw material liquid preheater, and the raw material liquid preheater is arranged on a feeding pipeline connecting the temporary storage container and the evaporation section; the evaporation section comprises a four-effect negative pressure evaporator, a two-effect evaporator, a three-effect negative pressure evaporator, a one-effect evaporator, a calcium-making one-effect evaporator and a flash tank which are sequentially connected through a feeding pipeline, wherein the calcium-making one-effect evaporator and the flash tank are respectively connected with high-temperature fresh steam of 1.5MPa through fresh steam pipelines, secondary steam generated by the calcium-making one-effect evaporator is connected with the one-effect evaporator through a corresponding secondary steam pipeline after being dewatered by a steam trap to heat the one-effect evaporator, the secondary steam generated by the one-effect evaporator is connected with a raw material liquid preheater of a feeding section through a pipeline to preheat a calcium chloride solution before entering the evaporation section, the evaporation efficiency of the four-effect negative pressure evaporator is improved, the waste heat steam generated by the raw material liquid preheater enters an air heat exchanger to heat air and then enters a condensation water barrel, and the secondary steam generated by the flash, one path is connected to a flaker through a secondary steam pipeline, and waste heat steam generated after the temperature of the flaker is reduced is sequentially connected to a double-effect evaporator and a triple-effect negative pressure evaporator through waste heat pipelines and then enters a washing bucket; the other path is also connected to a one-effect evaporator after being dewatered by a steam trap, and enters the one-effect evaporator together with the dewatered secondary steam generated by the calcium-making one-effect evaporator to heat the one-effect evaporator.
The method comprises the following steps of starting a calcium chloride solution temporary storage container, preheating the calcium chloride solution by a raw material liquid preheater, continuously evaporating the calcium chloride solution by an evaporation section to remove water to obtain a critical concentrated calcium chloride solution, feeding the critical concentrated calcium chloride solution into a flaker through a feeding pipeline, condensing the critical concentrated calcium chloride solution on a rotary drum of the flaker to obtain calcium chloride salt crystals, scraping the calcium chloride salt crystals from the rotary drum of the flaker by a scraper device, directly conveying the calcium chloride salt crystals to a hot air fluidized bed through a feed opening for hot air drying, conveying the dried calcium chloride to a packaging section through a conveying belt, and packaging the calcium chloride in a packaging machine to obtain a finished product.
In the calcium chloride solution evaporation process, high-temperature steam generated by the evaporation of the calcium chloride solution in the first-effect evaporator enters the second-effect evaporator, preheats the second-effect evaporator, then is mixed with high-temperature steam newly generated in the second-effect evaporator, finally is converged with the high-temperature steam generated in the first-effect evaporator for calcium preparation, enters the third-effect negative-pressure evaporator, and is connected into a water washing barrel after passing through a surface condenser and a steam-water separator together with the steam generated in the third-effect negative-pressure evaporator after preheating the third-effect negative-pressure evaporator. High-temperature steam generated by the calcium chloride solution in the flash tank enters the four-effect negative pressure evaporator after vapor-liquid separation, and is preheated and then is connected into the water washing barrel together with the steam generated by the four-effect negative pressure evaporator after passing through the surface condenser and the vapor-water separator. Through the mode, heat exchanged from the high-temperature steam pipeline can be retained in the whole evaporation system to the maximum extent, and the whole using amount of high-temperature steam is reduced while the heat loss in the system is reduced.
The hot air fluidized bed is a gas hot air fluidized bed and comprises a hot air fluidized bed body, a combustion chamber, an air inducing device and a calcium chloride absorption tower, external air is blown into the combustion chamber through an air blower to be combusted and heated to form hot air to enter the bottom of the hot air fluidized bed, hot air heat is utilized to evaporate water between calcium chloride crystals, then mixed gas is led into the two calcium chloride absorption towers which are connected in series in the hot air fluidized bed through the air inducing device arranged above the fluidized bed, and residual gas is discharged into the atmosphere after calcium chloride dust in the mixed gas is absorbed by aqueous solution in the calcium chloride absorption tower. And the packaging machine is also provided with an induced draft fan which is connected with the calcium chloride absorption tower. Can thoroughly absorb the calcium chloride powder dirt crystal that gas mixture and packagine machine packing in-process produced through this mode, prevent that the dust from getting into work and living environment, cause the pollution, and the absorption liquid of absorption tower can be through regularly monitoring and examining the calcium chloride content in absorption liquid and the well, can transfer this high concentration absorption liquid to calcium chloride and keep in the container and use as the raw materials when calcium chloride content exceeds 30% in the absorption liquid of first calcium chloride, in this regard as absorption mother liquor with the low concentration calcium chloride solution transfer in the second calcium chloride absorption tower to first calcium chloride absorption tower simultaneously, thereby realize the complete recovery of calcium chloride resource, reduce extravagantly.
And an air inlet of the combustion chamber is provided with an air heat exchanger. The air heat exchanger is connected with the raw material liquid preheater through a pipeline, and the waste heat steam generated after the raw material liquid preheater preheats the calcium chloride solution preheats the outside air, so that the air combustion efficiency in the combustion chamber is reduced.
Through the mode, the high-temperature steam quantity of 1.5MPa consumed by processing the calcium chloride solution with the purity of about 30% into the high-purity finished calcium chloride is reduced to 1.2 tons from 2.2 tons of steam consumed by each ton of the original product, the steam consumption is saved by 40%, and the benefit of a production line is obviously improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A calcium chloride solution concentration and crystallization system is characterized by comprising a feeding working section, an evaporation working section, a flaker, a hot air fluidized bed and a packing machine which are sequentially connected through a feeding pipeline and a conveying belt;
the feeding section comprises a calcium chloride solution temporary storage container and a steam heat exchanger, and the steam heat exchanger is arranged on a feeding pipeline connecting the temporary storage container and the evaporation section;
the evaporation section comprises a four-effect negative pressure evaporator, a two-effect evaporator, a three-effect negative pressure evaporator, a one-effect evaporator, a calcium-making one-effect evaporator and a flash tank which are connected in sequence through a feeding pipeline, wherein the calcium preparation one-effect evaporator and the flash tank are respectively connected with fresh steam through fresh steam pipelines, part of secondary steam generated by the calcium preparation one-effect evaporator and part of secondary steam generated by the flash tank are connected with the first-effect evaporator through corresponding secondary steam pipelines after being dewatered by the steam trap, the secondary steam generated by the first-effect evaporator is connected to the raw material liquid preheater through a pipeline to preheat the raw material liquid and then enters a condensation water bucket, the residual part of the secondary steam generated by the flash tank is connected into a flaker through a secondary steam pipeline, and the waste heat steam generated after the temperature of the flaker is reduced is sequentially connected into a secondary-effect evaporator and a triple-effect negative-pressure evaporator through waste heat pipelines and then enters a washing bucket;
the calcium chloride solution is preheated by a raw material liquid preheater from a calcium chloride solution temporary storage container, and is subjected to continuous evaporation to remove moisture by an evaporation section to obtain a critical concentrated calcium chloride solution, the critical concentrated calcium chloride solution enters a flaker through a feed pipeline and is condensed into calcium chloride salt crystals on a rotary drum of the flaker, the calcium chloride salt crystals are scraped from the rotary drum of the flaker through a scraper device and directly enter a hot air fluidized bed through a feed opening to be subjected to hot air drying, the dried calcium chloride is conveyed to a packaging section through a conveying belt, and a finished product is obtained after the dried calcium chloride is packaged in a packaging machine.
2. The calcium chloride solution concentration and crystallization system according to claim 1, wherein high-temperature steam generated by evaporation of the calcium chloride solution in the first-effect evaporator enters the second-effect evaporator, preheats the second-effect evaporator, then is mixed with high-temperature steam newly generated in the second-effect evaporator, finally is converged with high-temperature steam generated in the first-effect evaporator for calcium production, and then enters the third-effect negative-pressure evaporator, and the preheated third-effect negative-pressure evaporator and the steam generated in the third-effect negative-pressure evaporator are connected into the water washing barrel together after passing through the surface condenser and the steam-water separator.
3. The calcium chloride solution concentration and crystallization system according to claim 1, wherein high-temperature steam generated in the flash tank of the calcium chloride solution enters a heating chamber of a four-effect negative pressure evaporator, and the heated four-effect negative pressure evaporator and the steam generated by the four-effect negative pressure evaporator are connected into the water washing barrel after passing through the surface condenser and the steam-water separator.
4. The calcium chloride solution concentration and crystallization system according to claim 1, wherein the hot air fluidized bed is a gas hot air fluidized bed, and comprises a hot air fluidized bed body, a combustion chamber, an air inducing device and a calcium chloride absorption device, external air is blown into the combustion chamber through an air blower to be combusted and heated to form hot air, the hot air enters the bottom of the hot air fluidized bed, moisture among calcium chloride crystals is evaporated by using the heat of the hot air, then mixed gas is introduced into the calcium chloride absorption device from the hot air fluidized bed through the air inducing device arranged above the fluidized bed, and residual gas is discharged into the atmosphere after calcium chloride dust is absorbed by an aqueous solution in the calcium chloride absorption device.
5. The system for crystallization, concentration and crystallization of calcium chloride solution as claimed in claim 4, wherein the air inlet of the combustion chamber is provided with an air heat exchanger.
6. The calcium chloride solution concentration and crystallization system according to claim 5, wherein the air heat exchanger is connected with the raw material liquid preheater, the waste heat steam generated by the raw material liquid preheater is used for preheating the outside air, and the waste heat steam generated by the raw material liquid preheater enters the air heat exchanger for heat exchange and then enters the condensation water bucket.
7. The calcium chloride solution crystallization and separation system according to claim 4, wherein an induced draft fan is also arranged on the packaging machine, and the induced draft fan is connected with the calcium chloride absorption device.
8. The calcium chloride solution concentration and crystallization system according to claim 4, wherein the absorption liquid in the calcium chloride absorption device is added into the calcium chloride solution temporary storage container as a raw material liquid after the concentration of the absorption liquid exceeds 30%.
9. The calcium chloride solution concentration and crystallization system according to claim 4, wherein the calcium chloride absorption device comprises two calcium chloride absorption towers which are connected in series.
10. The calcium chloride solution concentration and crystallization system according to claim 9, wherein the two calcium chloride absorption towers connected in series are used for feeding the absorption liquid with lower concentration in the second absorption tower as mother liquid into the first absorption tower after the concentration of the absorption liquid in the first absorption tower reaches the standard and is fed into the calcium chloride temporary storage container as raw material liquid in the absorption process.
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| CN202011430390.8A CN112569630A (en) | 2020-12-09 | 2020-12-09 | Calcium chloride solution concentration and crystallization system |
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| CN202011430390.8A CN112569630A (en) | 2020-12-09 | 2020-12-09 | Calcium chloride solution concentration and crystallization system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115028178A (en) * | 2022-08-15 | 2022-09-09 | 中化(浙江)膜产业发展有限公司 | System and process for recovering wastewater containing sodium bromide and sodium carbonate |
| CN116022852A (en) * | 2023-02-13 | 2023-04-28 | 深圳市捷晶科技股份有限公司 | Manganese sulfate crystallization system and crystallization method |
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| CN102512835A (en) * | 2011-12-26 | 2012-06-27 | 上海缔森能源技术有限公司 | Multi-effect plate type rising film countercurrent evaporation concentration device and method thereof |
| CN104984557A (en) * | 2015-07-27 | 2015-10-21 | 高凤林 | Five-effect eight-body crystallization and evaporation process |
| CN207451655U (en) * | 2017-09-23 | 2018-06-05 | 苏圣科技（无锡）有限公司 | A kind of chloride containing calcium waste water evaporative crystallization processing system |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101306260A (en) * | 2007-07-12 | 2008-11-19 | 项公浩 | Multifunctional multiple-effect automatic continuous evaporative crystallization technique and crystallization device |
| CN102512835A (en) * | 2011-12-26 | 2012-06-27 | 上海缔森能源技术有限公司 | Multi-effect plate type rising film countercurrent evaporation concentration device and method thereof |
| CN104984557A (en) * | 2015-07-27 | 2015-10-21 | 高凤林 | Five-effect eight-body crystallization and evaporation process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115028178A (en) * | 2022-08-15 | 2022-09-09 | 中化(浙江)膜产业发展有限公司 | System and process for recovering wastewater containing sodium bromide and sodium carbonate |
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| CN116022852A (en) * | 2023-02-13 | 2023-04-28 | 深圳市捷晶科技股份有限公司 | Manganese sulfate crystallization system and crystallization method |
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Application publication date: 20210330 |