CN110314772B - Method for improving quality of dried adipic acid product by utilizing particle size screening - Google Patents
Method for improving quality of dried adipic acid product by utilizing particle size screening Download PDFInfo
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- CN110314772B CN110314772B CN201910620103.0A CN201910620103A CN110314772B CN 110314772 B CN110314772 B CN 110314772B CN 201910620103 A CN201910620103 A CN 201910620103A CN 110314772 B CN110314772 B CN 110314772B
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- adipic acid
- granularity
- air
- nitrogen
- separation chamber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
- B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
- F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/08—Granular materials
Abstract
The application discloses an adipic acid granularity screening device and a method for improving the quality of a dried adipic acid product by utilizing the same to carry out granularity screening, which belong to the technical field of adipic acid production, adipic acid granularity sieving mechanism includes the fluidized bed dryer, big feed bin, the nitrogen gas source, even wind ware, the air separator, cyclone and packing weighing device, the air separator is equipped with gas inlet, the material import, air separator export and big granularity material export, the fluidized bed dryer passes through pipe chain conveyor and big feed bin top import and links to each other, the material import that pipeline and air separator were passed through to big feed bin bottom export links to each other, the nitrogen gas source passes through the import of pipeline and even wind ware and links to each other, the export of even wind ware and the gas inlet of air separator link to each other, air separator exports the import that pipeline and cyclone and links to each other, cyclone is equipped with dust outlet and small size material export, the upper portion that the dust export passes through pipeline and big feed bin links to each other.
Description
Technical Field
The invention belongs to the technical field of adipic acid production, and particularly relates to an adipic acid particle size screening device and a method for improving the quality of a dried adipic acid product by using the same for particle size screening.
Background
The invention is attached to an adipic acid drying device, and the adipic acid drying device comprises two working procedures: a drying process and a packaging process. The raw material of the drying procedure is high-quality adipic acid with water content of 8-10% (obtained by the process of CN106810442B, a production method of high-quality adipic acid), the raw material is fluidized in an internal heating type drying fluidized bed with hot air heated by low-pressure steam after entering the drying procedure, the temperature is controlled at 70-90 ℃, most of water in the high-quality adipic acid is carried away by the hot air, and a product with water content of 0.13-0.2% is obtained, and the product enters the packaging procedure of the device for packaging and weighing (see figure 1), and is finally supplied to downstream users. According to the downstream customer reflection, compared with the imported daily dry adipic acid product, the domestic dry adipic acid product has no difference in various product quality indexes, but generally has poor fluidity, and after being stored for a certain time, the product has a caking phenomenon, and is analyzed and determined as follows: the dried adipic acid produced in daily life has large and uniform granularity which is generally more than 0.4mm, and the water content is lower than that of the dried adipic acid produced in China (0.05-0.07 percent).
At present, on all adipic acid production lines in China, no production process for improving the quality of adipic acid products by screening the particle size of dried adipic acid is reported.
Disclosure of Invention
The invention aims to provide an adipic acid particle size screening device and a method for improving the quality of a dried adipic acid product by utilizing the adipic acid particle size screening device to perform particle size screening.
Based on the purpose, the invention adopts the following technical scheme:
the utility model provides an adipic acid granularity sieving mechanism, including the fluidized bed dryer, big feed bin, the nitrogen source, even wind ware, the air separator, cyclone and packing weighing equipment, the air separator is equipped with gas inlet, the material import, air separator export and big granularity material export, the fluidized bed dryer passes through pipe chain conveyor and big feed bin top import and links to each other, big feed bin bottom export links to each other with the material import of air separator, the nitrogen source passes through the import of pipeline and even wind ware and links to each other, the export of even wind ware and the gas inlet of air separator link to each other, air separator exports the import that passes through pipeline and cyclone and links to each other, cyclone is equipped with dust outlet and small granularity material export, the upper portion that the dust outlet passes through pipeline and big feed bin links to each other.
Furthermore, a nitrogen regulating valve is arranged on a pipeline between the nitrogen source and the air evening device; the pipeline between the large material bin and the air separation chamber is provided with a star-shaped feeder, and materials in the large material bin uniformly enter the air separation chamber through the star-shaped feeder.
Furthermore, a large-particle-size material outlet of the air separation chamber and a small-particle-size material outlet of the cyclone separator are respectively provided with a first package weighing device and a second package weighing device.
Furthermore, the air separation chamber is a hollow cylinder, the diameter of the air separation chamber is 250mm (matched with the star-shaped feeder), the width of the outlet end of the air homogenizing device is about 220mm, and the height of the air homogenizing device is about 1 mm.
The method for improving the quality of the dried adipic acid product by utilizing the adipic acid granularity screening device to carry out granularity screening comprises the following steps:
(1) adding adipic acid with the moisture content of 8-10% into a fluidized bed dryer, drying at 70-90 ℃ until the moisture content is 0.13-0.2%, storing in a large bin, and uniformly entering an air separation chamber through a star-shaped feeder;
(2) nitrogen of 0.5-0.6 MPa provided by a nitrogen source is decompressed by a nitrogen regulating valve and then enters an air homogenizer, and nitrogen wind with the wind speed of 3-6 m/s is obtained at the outlet of the air homogenizer;
(3) in an air separation chamber, nitrogen air is contacted with dry adipic acid which falls uniformly, under the blowing of the nitrogen air, the dry adipic acid with the granularity of less than 0.4mm and the water content of 0.06-0.08% is blown into a cyclone separator, and large-granularity dry adipic acid with the granularity of more than or equal to 0.4mm and the water content of 0.06-0.08% directly falls into a first packaging weighing device at the lower part of the air separation chamber by means of gravity sedimentation to obtain a large-granularity packaging product;
(4) after gas-solid separation is carried out in a cyclone separator, dry adipic acid with the granularity of 0.4-0.1mm and the water content of 0.03-0.06 percent enters second packaging weighing equipment to obtain a small-granularity packaging product, and dust with the granularity of less than 0.1mm separated by the cyclone separator returns to a large storage bin and is dedusted together with the gas phase of the large storage bin.
Further, the weight ratio of the small particle size packaged product to the large particle size packaged product is 1: 2.
Preferably, the purity of the nitrogen in the nitrogen source is 99.99%, and the feeding speed of the star-shaped feeder is 5 tons/hour.
The dry adipic acid treated by grading by the method has uniform granularity, contact points among particles are greatly reduced after packaging, the problem that the dry adipic acid is easy to agglomerate during storage is solved, meanwhile, the flowability of the dry adipic acid is increased due to uniform granularity, convenience is brought to downstream production, the water content in the dry adipic acid is lower due to the addition of nitrogen, and the product quality is further improved.
Drawings
FIG. 1 is a flow diagram of a prior art process for adipic acid;
FIG. 2 is a schematic structural diagram of an adipic acid particle size screening apparatus according to the present invention;
FIG. 3 is a top view of the connection structure of the nitrogen pipeline, the air equalizer and the air separation chamber;
FIG. 4 is a flow chart of the process for screening the particle size of adipic acid according to the present invention, wherein 1, a large bunker, 2, a star feeder, 3, a fluidized bed dryer, 4, a nitrogen source, 5, a nitrogen regulating valve, 6, an air homogenizer, 7, an air separation chamber, 8, a cyclone separator, 9, a first packing and weighing device, and 10, a second packing and weighing device.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to specific embodiments and drawings, but the present invention is not limited thereto.
The packaging weighing device comprises a packaging bag and a weigher, wherein the packaging bag is positioned on a scale pan of the weigher, so that materials discharged from a discharge port directly enter the packaging bag, and the packaging bag is directly packaged when the materials in the packaging bag meet a certain weight requirement through observation of the weigher.
Example 1
The utility model provides an adipic acid granularity sieving mechanism, as shown in fig. 2 and 3, including fluidized bed dryer 3, big feed bin 1, nitrogen gas source 4, even wind ware 6, air separator 7, cyclone 8 and packing weighing device, air separator 7 is equipped with gas inlet, the material import, air separator export and big granularity material export, fluidized bed dryer 3 links to each other through pipe chain conveyor and big feed bin 1 top import, big feed bin 1 bottom export links to each other through the material import of pipeline with air separator 7, nitrogen gas source 4 links to each other through the import of pipeline with even wind ware 6, the export of even wind ware 6 links to each other with air separator 7's gas inlet, air separator export links to each other through the import of pipeline with cyclone 8, cyclone 8 is equipped with dust outlet and small granularity material export, the dust export links to each other through the upper portion of pipeline with big feed bin 1.
Further, a nitrogen adjusting valve 5 is arranged on a pipeline between the nitrogen source 4 and the air evening device 6; the pipeline between the large material bin 1 and the air separation chamber 7 is provided with a star-shaped feeder 2, and materials in the large material bin 1 uniformly enter the air separation chamber 7 through the star-shaped feeder 2.
Further, a large-particle-size material outlet of the air separation chamber 7 and a small-particle-size material outlet of the cyclone separator 8 are respectively provided with a first package weighing device 9 and a second package weighing device 10.
Further, the air separation chamber 7 is a hollow cylinder, the diameter of the air separation chamber 7 is 250mm, the width of the outlet end of the air homogenizing device 6 is about 220mm, and the height is about 1 mm.
The method for improving the quality of the dried adipic acid product by utilizing the adipic acid granularity screening device to carry out granularity screening comprises the following steps:
(1) adding adipic acid with the moisture content of 8-10% into a fluidized bed dryer 3, drying at 70-90 ℃ until the moisture content is 0.13-0.2%, storing in a large silo 1, wherein the particle size distribution of the adipic acid in the large silo 1 is 0.2-0.6mm and accounts for more than 80%, and uniformly feeding into an air separation chamber 7 through a star-shaped feeder 2;
(2) nitrogen gas of 0.5-0.6 MPa provided by a nitrogen gas source 4 is decompressed by a nitrogen gas regulating valve 5 and then enters an air uniformizing device 6 (the width L of an air outlet at the right end is 220mm, the height is about 1mm, a 3-' pipe can be used, the air uniformizing device can be obtained by flattening in the front, the concrete connection with an air separation chamber 7 is shown in figure 3), and nitrogen air with the air speed of 3-6 m/s is obtained at the outlet of the air uniformizing device 6;
(3) in the air separation chamber 7, nitrogen air is contacted with the dry adipic acid which falls uniformly, under the blowing of the nitrogen air, the dry adipic acid with the granularity of less than 0.4mm and the water content of 0.06-0.08% is blown into a cyclone separator 8, and the dry adipic acid with the large granularity, the granularity of which is more than or equal to 0.4mm and the water content of 0.06-0.08% directly falls into a first packing and weighing device 9 at the lower part of the air separation chamber 7 by gravity settling to obtain a large-granularity packing product;
(4) after gas-solid separation is carried out in the cyclone separator 8, dry adipic acid with the granularity of 0.4-0.1mm and the water content of 0.03-0.06 percent enters a second packaging weighing device 10 to obtain a small-granularity packaging product, and dust with the granularity of less than 0.1mm separated by the cyclone separator 8 returns to the large storage bin 1 to achieve the purpose of dust removal;
(5) the degree of separation was controlled by controlling the weight ratio of the small particle size packaged product to the large particle size packaged product to be 1: 2.
Preferably, the purity of the nitrogen in the nitrogen source 4 is 99.99%, and the feeding speed of the star-shaped feeder 2 is 5 tons/hour.
Comparison of the properties of the dried adipic acid product treated by the method of the present invention, the dried adipic acid product obtained by the prior art, and the adipic acid product produced daily:
two types of dried adipic acid products, namely a large-particle-size adipic acid product and a small-particle-size adipic acid product, are obtained by the method, and are compared with dried adipic acid products and daily-produced dried adipic acid products obtained by the existing production process in terms of material flowability and product moisture content, and the data are as follows:
1. material fluidity: taking three bags of samples of four products which are packaged identically and have the weight of 1000 +/-2 kg respectively, hanging the samples at the bottom of the samples in a place 1.5 meters away from the surface by using a forklift, simultaneously opening a discharge hole at the lower part, timing by using a stopwatch, and confirming the time of each empty bag of the products, wherein the results are as follows:
through the experiments, the dried adipic acid product with large particle size is found to have more improvement on the fluidity than the dried adipic acid product produced by the prior art, the dried adipic acid product with small particle size also has improvement on the fluidity, but the improvement is smaller, and the adipic acid product with large particle size is equivalent to the adipic acid product produced in daily life in the fluidity.
2. Moisture content of the product: samples were taken at the same time in the three products at will for comparative analysis, with the following results:
through analysis, the following results are found: the moisture content of the large-particle-size adipic acid product and the small-particle-size adipic acid product is obviously reduced from that of the original adipic acid product, and the moisture content is basically not different from that of the imported adipic acid product.
Claims (3)
1. A method for improving the quality of a dried adipic acid product by utilizing an adipic acid granularity screening device to carry out granularity screening, the adipic acid granularity screening device is characterized by comprising a fluidized bed dryer, a large bin, a nitrogen source, an air homogenizer, an air separation chamber, a cyclone separator and a packaging and weighing device, wherein the air separation chamber is provided with a gas inlet, a material inlet, an air separation outlet and a large-granularity material outlet; a nitrogen regulating valve is arranged on a pipeline between the nitrogen source and the air evening device; a star-shaped feeder is arranged on a pipeline between the large material bin and the air separation chamber, and materials in the large material bin uniformly enter the air separation chamber through the star-shaped feeder; a large-particle-size material outlet of the air separation chamber and a small-particle-size material outlet of the cyclone separator are respectively provided with a first package weighing device and a second package weighing device;
the method comprises the following steps:
(1) adding adipic acid with the moisture content of 8-10% into a fluidized bed dryer, drying at 70-90 ℃ until the moisture content is 0.13-0.2%, storing in a large bin, and uniformly entering an air separation chamber through a star-shaped feeder;
(2) nitrogen of 0.5-0.6 MPa provided by a nitrogen source is decompressed by a nitrogen regulating valve and then enters an air homogenizer, and nitrogen wind with the wind speed of 3-6 m/s is obtained at the outlet of the air homogenizer;
(3) in an air separation chamber, nitrogen air is contacted with dry adipic acid which falls uniformly, under the blowing of the nitrogen air, the dry adipic acid with the granularity of less than 0.4mm and the water content of 0.06-0.08% is blown into a cyclone separator, and large-granularity dry adipic acid with the granularity of more than or equal to 0.4mm and the water content of 0.06-0.08% directly falls into a first packaging weighing device at the lower part of the air separation chamber by means of gravity sedimentation to obtain a large-granularity packaging product;
(4) after gas-solid separation is carried out in a cyclone separator, dry adipic acid with the granularity of 0.4-0.1mm and the water content of 0.03-0.06 percent enters second packaging weighing equipment to obtain a small-granularity packaged product, and dust with the granularity of less than 0.1mm separated by the cyclone separator returns to a large storage bin.
2. The method of claim 1, wherein the weight ratio of small particle size packaged products to large particle size packaged products is 1: 2.
3. The method as claimed in claim 1, wherein the purity of the nitrogen gas in the nitrogen gas source is 99.99%, and the feeding speed of the star-shaped feeder is 5 tons/hour.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4299694A (en) * | 1980-08-25 | 1981-11-10 | The Direct Reduction Corporation | Method and apparatus for char separation from the discharge materials of an iron oxide reducing kiln |
| EP0982082A1 (en) * | 1998-08-21 | 2000-03-01 | Beloit Technologies, Inc. | Apparatus for separating mixed particulate material |
| CN102716857A (en) * | 2012-06-08 | 2012-10-10 | 清华大学 | Pneumatic particle size classifying device for solid particles |
| CN202687388U (en) * | 2012-07-18 | 2013-01-23 | 中国天辰工程有限公司 | Conveying system for industrial solid adipic acid |
| CN104550026A (en) * | 2014-12-18 | 2015-04-29 | 杨连明 | Method for sorting limestone chips by utilizing fluidized bed |
| CN206103397U (en) * | 2016-09-27 | 2017-04-19 | 山东华鲁恒升化工股份有限公司 | Adipic acid purification crystallization device |
-
2019
- 2019-07-10 CN CN201910620103.0A patent/CN110314772B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4299694A (en) * | 1980-08-25 | 1981-11-10 | The Direct Reduction Corporation | Method and apparatus for char separation from the discharge materials of an iron oxide reducing kiln |
| EP0982082A1 (en) * | 1998-08-21 | 2000-03-01 | Beloit Technologies, Inc. | Apparatus for separating mixed particulate material |
| CN102716857A (en) * | 2012-06-08 | 2012-10-10 | 清华大学 | Pneumatic particle size classifying device for solid particles |
| CN202687388U (en) * | 2012-07-18 | 2013-01-23 | 中国天辰工程有限公司 | Conveying system for industrial solid adipic acid |
| CN104550026A (en) * | 2014-12-18 | 2015-04-29 | 杨连明 | Method for sorting limestone chips by utilizing fluidized bed |
| CN206103397U (en) * | 2016-09-27 | 2017-04-19 | 山东华鲁恒升化工股份有限公司 | Adipic acid purification crystallization device |
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