CN113198192A - Method for drying slurry by using double-film evaporator - Google Patents
Method for drying slurry by using double-film evaporator Download PDFInfo
- Publication number
- CN113198192A CN113198192A CN202110509369.5A CN202110509369A CN113198192A CN 113198192 A CN113198192 A CN 113198192A CN 202110509369 A CN202110509369 A CN 202110509369A CN 113198192 A CN113198192 A CN 113198192A
- Authority
- CN
- China
- Prior art keywords
- film evaporator
- slurry
- thin film
- drying
- vertical
- 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0011—Heating features
- B01D1/0041—Use of fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
- B01D1/24—Evaporating by bringing a thin layer of the liquid into contact with a heated surface to obtain dry solids
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The technical scheme of the invention is realized as follows: a method for drying slurry by using a double-thin film evaporator is characterized by comprising the following steps: the method comprises the following steps: s1: introducing the SAF slurry into a vertical thin film evaporator, introducing steam into the vertical thin film evaporator, heating the slurry, decomposing light-component compounds such as methanol, ethane, methane, ethylene and the like from a complex formed by methyl ether and SAF in the slurry at high temperature, and discharging the light-component compounds from the vertical thin film evaporator in a gaseous state along with the evaporation of an organic solvent in the slurry when the steam is used for heating the outside of the vertical thin film evaporator; s2: the slurry heated by the vertical film evaporator enters the horizontal film evaporator through an expansion joint, the outside of the horizontal film evaporator is heated by heat conduction oil, and dried powder is sent out after heating; the invention has the beneficial effects that: high drying efficiency and good effect, and can recycle the organic solvent.
Description
Technical Field
The invention relates to the technical field of slurry drying, in particular to a method for drying slurry by using a double-thin-film evaporator.
Background
The existing slurry drying methods mainly comprise spray drying, rotary drum drying, belt drying, thin film evaporator and the like; the energy consumption of spray drying is high, the temperature requirement of hot air entering the tower is strict, the temperature is too low, and the drying is insufficient; the rotary drum is suitable for bulk materials such as calcium carbonate, and the bulk materials need to be crushed and classified in the process, but the rotary drum is difficult to assemble and disassemble, small in heat capacity, low in heat efficiency, large in difference of residence time of the materials in the rotary drum, easy to cause overheating of the materials and influence on product quality; the belt drying has poor sealing property and is not suitable for drying organic solvent slurry.
The film evaporator on the market is generally a single-stage one, and is also called a rotary film evaporator, which is a novel evaporator for dispersing feed liquid into a uniform film by utilizing a scraper which can rotate at a high speed so as to concentrate materials; at present, the thin film evaporator is used for evaporating and drying the slurry in China, but the single-stage thin film evaporator is adopted, because the retention time of the slurry is short, the evaporation degree is not enough, and the drying effect is poor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for drying slurry by using a double-thin-film evaporator, which has high drying speed and high efficiency.
The technical scheme of the invention is realized as follows: a method for drying slurry by using a double-thin film evaporator is characterized by comprising the following steps: the method comprises the following steps:
s1: introducing the SAF slurry into a vertical thin film evaporator, introducing steam into the vertical thin film evaporator, heating the slurry, decomposing light-component compounds such as methanol, ethane, methane, ethylene and the like from a complex formed by methyl ether and SAF in the slurry at high temperature, and discharging the light-component compounds from the vertical thin film evaporator in a gaseous state along with the evaporation of an organic solvent in the slurry when the steam is used for heating the outside of the vertical thin film evaporator;
s2: and the slurry heated by the vertical film evaporator enters the horizontal film evaporator through the expansion joint, is heated by utilizing heat conduction oil outside the horizontal film evaporator, and is heated to send out the dried powder.
Preferably: in step S1, the pressure of steam heated in the vertical thin film evaporator is 50psig, the temperature is 180-220 ℃, and in step S2, the temperature of the heat-conducting oil heated in the horizontal thin film evaporator is 360-400 ℃.
Preferably: in step S1, the SAF slurry is stored in a slurry storage tank before drying, and the pressure in the slurry storage tank is constant at 40-50 psig.
Preferably: in step S1, the organic solvent in the vertical thin film evaporator is discharged from the condenser and cooled to a liquid state, and the liquid is stored in a condensate tank.
Preferably: in step S1, a discharge port for discharging the organic solvent is provided on the vertical thin film evaporator, and a plurality of methyl ether nozzles for intercepting the powder are provided in the discharge port.
Preferably: the vertical film evaporator and the horizontal film evaporator are both internally provided with stirring scrapers and driving devices for driving the stirring scrapers to rotate, each driving device comprises a motor and a rotating shaft controlled by a motor, and the stirring scrapers are arranged on the rotating shafts.
Preferably: the rotating shaft in the vertical film evaporator extends downwards into the expansion joint, and the extension section of the rotating shaft is provided with a dredging scraper.
The invention has the beneficial effects that:
(1) the method comprises the steps of putting slurry into a vertical film evaporator to be heated by steam, and entering horizontal film evaporator to heat conduction oil after primary heating and drying; after entering from the vertical thin film evaporator, most of the solvent is evaporated to form primary powder, then the primary powder enters the horizontal thin film evaporator to be heated again, and after being evaporated, the organic solvent passes through an upper outlet of the vertical thin film evaporator in a gas form, passes through a solvent condenser and then enters a condensate tank; adopt two evaporators to heat, and adopt different heating forms and temperature, can be quick carry out the drying to thick liquids, the powder drying rate is fast, and is efficient, and drying effect preferred can carry out effectual recycle with organic solvent moreover.
(2) The rising of the powder can be intercepted through the arrangement of the nozzle, and the dried powder is prevented from being discharged from a discharge hole along with gaseous organic solution to influence the drying of the powder and the recovery of the organic solution; the motor drives the rotating shaft to rotate so as to drive the stirring scraper to rotate to stir the dried slurry, so that the drying efficiency is improved; through the arrangement of the dredging scraper, the expansion joint for connecting the vertical film evaporator and the horizontal film evaporator is dredged and fed, so that the blockage of the expansion joint is avoided, and the stable entering of slurry in the vertical film evaporator into the horizontal film evaporator is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic perspective view of an embodiment of the present invention;
the examples in the figure are: the device comprises a vertical thin film evaporator 1, a horizontal thin film evaporator 2, an expansion joint 3, a steam jacket 4, a heat-conducting oil jacket 5, a discharge port 6, a methyl ether nozzle 7, a motor 8, a rotating shaft 9, a stirring scraper 10, a dredging scraper 11, a condenser 12 and a condensate tank 13.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a method for drying slurry by using a double-thin film evaporator, which comprises the following steps:
s1: introducing the SAF slurry into a vertical thin film evaporator, introducing steam into the vertical thin film evaporator, heating the slurry, decomposing a complex formed by methyl ether and SAF in the slurry at high temperature to obtain light-component compounds such as methanol, ethane, methane, ethylene and the like, heating the outside of the vertical thin film evaporator by using the steam, wherein the heating steam pressure is 50psig, the temperature is 200 ℃, and when heating, the light-component compounds are discharged from the vertical thin film evaporator in a gaseous form along with the evaporation of an organic solvent in the slurry, and are cooled into a liquid state by a condenser 12 to enter a condensate tank 13 for storage;
s2: at the moment, the SAF slurry dried by the vertical film evaporator still contains fifteen percent of organic matters which need to be dried by the horizontal film evaporator, the slurry heated and dried by the vertical film evaporator enters the horizontal film evaporator through an expansion joint, heat conducting oil is used for heating the outside of the horizontal film evaporator, the temperature of the heat conducting oil is 380 ℃, the dried powder is sent out after heating, the temperature of the sent early-dispelling powder is 330-350 ℃, and the content of residual carbon is about 0.2-0.4%.
In this example, the SAF slurry was stored prior to drying using a slurry storage tank at a constant pressure of 50psig in step S1.
According to the technical scheme, the slurry is firstly put into a vertical film evaporator to be heated by steam, and is primarily heated and dried and then enters a horizontal film evaporator to be heated by heat conduction oil; after entering from the vertical thin film evaporator, most of the solvent is evaporated to form primary powder, then the primary powder enters the horizontal thin film evaporator to be heated again, and after being evaporated, the organic solvent passes through an upper outlet of the vertical thin film evaporator in a gas form, passes through a solvent condenser and then enters a condensate tank; adopt two evaporators to heat, and adopt different heating forms and temperature, can be quick carry out the drying to thick liquids, the powder drying rate is fast, and is efficient, and drying effect preferred can carry out effectual recycle with organic solvent moreover.
As shown in fig. 1 and fig. 2, in the present embodiment, a steam jacket 4 is arranged outside a vertical thin film evaporator 1, a heat conducting oil jacket 5 is arranged outside a horizontal thin film evaporator 2, a discharge port 6 for discharging an organic solvent is arranged on the vertical thin film evaporator 1, a methyl ether nozzle 7 for intercepting powder is arranged in the discharge port 6, and the number of the methyl ether nozzles is plural; the vertical thin film evaporator 1 and the horizontal thin film evaporator 2 are both internally provided with a stirring scraper 10 and a driving device for driving the stirring scraper to rotate, the driving device comprises a motor 8 and a rotating shaft 9 controlled by the motor 8, and the stirring scraper 10 is arranged on the rotating shaft 9; the rotating shaft in the vertical film evaporator extends downwards into the expansion joint 3, and the extension section of the rotating shaft is provided with a dredging scraper 11.
By the technical scheme, the rising of the powder can be intercepted by arranging the nozzle, so that the dried powder is prevented from being discharged from the discharge hole along with the gaseous organic solution to influence the drying of the powder and the recovery of the organic solution; the motor drives the rotating shaft to rotate so as to drive the stirring scraper to rotate to stir the dried slurry, so that the drying efficiency is improved; through the arrangement of the dredging scraper, the expansion joint for connecting the vertical film evaporator and the horizontal film evaporator is dredged and fed, so that the blockage of the expansion joint is avoided, and the stable entering of slurry in the vertical film evaporator into the horizontal film evaporator is ensured.
In addition, a discharge mechanism (not shown in the figure) for discharging the dried powder is also arranged, and the double-stage thin-film evaporator pneumatically conveys and discharges the dried solid powder to the SAF through a rotating air lock, and the work is operated under vacuum; the operating pressure of the dual-stage thin film evaporator was set at 1psig, thus avoiding the return of air with leaks into the system; oxygen must be completely excluded or else it will react with dimethyl ether; the use of a lower positive operating pressure thus allows the evaporation operation to be carried out at as low a temperature as possible; this minimizes residence time and also minimizes decomposition of the DME/SAF complex into light components; adding nitrogen gas both above and below the rotating damper to prevent air from leaking in, and doing so also facilitates purging of solvent vapor from the dryer; nitrogen can also be used to clean the rotor bearings.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A method for drying slurry by using a double-thin film evaporator is characterized by comprising the following steps: the method comprises the following steps:
s1: introducing the SAF slurry into a vertical thin film evaporator, introducing steam into the vertical thin film evaporator, heating the slurry, decomposing light-component compounds such as methanol, ethane, methane, ethylene and the like from a complex formed by methyl ether and SAF in the slurry at high temperature, and discharging the light-component compounds from the vertical thin film evaporator in a gaseous state along with the evaporation of an organic solvent in the slurry when the steam is used for heating the outside of the vertical thin film evaporator;
s2: and the slurry heated by the vertical film evaporator enters the horizontal film evaporator through the expansion joint, is heated by utilizing heat conduction oil outside the horizontal film evaporator, and is heated to send out the dried powder.
2. The method for drying a slurry with a double thin film evaporator according to claim 1, wherein: in step S1, the pressure of steam heated in the vertical thin film evaporator is 50psig, the temperature is 180-220 ℃, and in step S2, the temperature of the heat-conducting oil heated in the horizontal thin film evaporator is 360-400 ℃.
3. The method for drying a slurry with a double thin film evaporator according to claim 1, wherein: in step S1, the SAF slurry is stored in a slurry storage tank before drying, and the pressure in the slurry storage tank is constant at 40-50 psig.
4. The method for drying a slurry with a double thin film evaporator according to claim 1, wherein: in step S1, the organic solvent in the vertical thin film evaporator is discharged from the condenser and cooled to a liquid state, and the liquid is stored in a condensate tank.
5. The method for drying a slurry with a double thin film evaporator according to claim 1, wherein: in step S1, a discharge port for discharging the organic solvent is provided on the vertical thin film evaporator, and a plurality of methyl ether nozzles for intercepting the powder are provided in the discharge port.
6. The method for drying a slurry with a double thin film evaporator according to claim 1, wherein: the vertical film evaporator and the horizontal film evaporator are both internally provided with stirring scrapers and driving devices for driving the stirring scrapers to rotate, each driving device comprises a motor and a rotating shaft controlled by a motor, and the stirring scrapers are arranged on the rotating shafts.
7. The method for drying a slurry with a double thin film evaporator according to claim 6, wherein: the rotating shaft in the vertical film evaporator extends downwards into the expansion joint, and the extension section of the rotating shaft is provided with a dredging scraper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110509369.5A CN113198192A (en) | 2021-05-11 | 2021-05-11 | Method for drying slurry by using double-film evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110509369.5A CN113198192A (en) | 2021-05-11 | 2021-05-11 | Method for drying slurry by using double-film evaporator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113198192A true CN113198192A (en) | 2021-08-03 |
Family
ID=77030763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110509369.5A Pending CN113198192A (en) | 2021-05-11 | 2021-05-11 | Method for drying slurry by using double-film evaporator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113198192A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203075795U (en) * | 2013-02-19 | 2013-07-24 | 六九硅业有限公司 | Powder intercept device |
| CN107485876A (en) * | 2017-10-17 | 2017-12-19 | 青岛科技大学 | The vertical sleeping built up thin film evaporator of one kind |
| CN209020127U (en) * | 2018-10-31 | 2019-06-25 | 天津富瑞丰生物科技有限公司 | Emission-control equipment is used in a kind of production of organic fertilizer |
| CN209952255U (en) * | 2019-03-19 | 2020-01-17 | 珠海联固化学工业有限公司 | Scraper film evaporator |
| CN210044876U (en) * | 2019-03-18 | 2020-02-11 | 无锡麒麟石化设备有限公司 | Vertical and horizontal combined film evaporator |
-
2021
- 2021-05-11 CN CN202110509369.5A patent/CN113198192A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203075795U (en) * | 2013-02-19 | 2013-07-24 | 六九硅业有限公司 | Powder intercept device |
| CN107485876A (en) * | 2017-10-17 | 2017-12-19 | 青岛科技大学 | The vertical sleeping built up thin film evaporator of one kind |
| CN209020127U (en) * | 2018-10-31 | 2019-06-25 | 天津富瑞丰生物科技有限公司 | Emission-control equipment is used in a kind of production of organic fertilizer |
| CN210044876U (en) * | 2019-03-18 | 2020-02-11 | 无锡麒麟石化设备有限公司 | Vertical and horizontal combined film evaporator |
| CN209952255U (en) * | 2019-03-19 | 2020-01-17 | 珠海联固化学工业有限公司 | Scraper film evaporator |
Non-Patent Citations (3)
| Title |
|---|
| 孟祥和，胡国飞: "《重金属废水处理》", 31 May 2000, 化学工业出版社 * |
| 马洛平: "《消除有害泡沫技术》", 31 December 1987, 化学工业出版社 * |
| 高炎武: "《中华人民共和国化学工业部设备维护检修规程 第7分册 化工部分》", 31 October 1992, 化学工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101831314B (en) | Method for humidifying and drying coking coal in coke oven and equipment therefor | |
| KR100632323B1 (en) | Recovery method of volatile compounds from solids in aqueous solution | |
| US20230256356A1 (en) | Pyrolysis bio-oil fractional condensation device and method capable of cooling medium self-circulation | |
| CN108587671A (en) | A kind of apparatus and method of biomass quick catalysis pyrolysis | |
| CN102453161A (en) | Polypropylene powder postprocessing method | |
| CN114472474A (en) | Industrial waste salt recycling treatment system and method | |
| CN105347641A (en) | Apparatus for performing microwave pyrolysis on sludge by utilizing rotary kiln and method | |
| CN113198192A (en) | Method for drying slurry by using double-film evaporator | |
| CN117427350B (en) | Bromine production evaporation equipment | |
| CN101693767B (en) | Devolatilization method of soluble high molecular polymers and device thereof | |
| CN115944944A (en) | Mixing extraction filtering and drying integrated machine | |
| CN108467742A (en) | A kind of sand desorption processing method and its device using flue gas indirectly heat | |
| CN108635893A (en) | A kind of luwa evaporator | |
| Meredith | Dryhouse design: focusing on reliability and return on investment | |
| CN115106025A (en) | Environment-friendly and energy-saving production device and production method of dimethylformamide | |
| CN115215338A (en) | Process system and method for preparing porous carbon through carbonization and activation of biomass tar | |
| CN112624562A (en) | Sludge heat drying system and application thereof in sludge heat drying | |
| CN202958724U (en) | Drying and evaporating equipment | |
| CN112912153A (en) | Production equipment and production method of sucrose-6-ester | |
| CN216366636U (en) | Device for recovering sodium ethoxide from organic solution of sodium ethoxide | |
| CN112877088B (en) | Solvent recovery system and method | |
| CN213375179U (en) | Ammonium chloride recovery unit | |
| CN218972667U (en) | Processing system | |
| KR102376308B1 (en) | Drying of sludge and drying method thereof | |
| CN117771909B (en) | Full-automatic processing apparatus of chlorine in calcium hypochlorite production |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210803 |