阅读说明：本技术 Mbs生产用干燥装置 (Drying device for MBS production ) 是由 黄继广 刘春信 焦淑元 王滨 张海渝 张振国 于 2019-11-12 设计创作，主要内容包括：本发明属于MBS生产设备技术领域,具体涉及一种MBS生产用干燥装置,所述的MBS生产用干燥装置,包括气流干燥管、真空盘式干燥器和水环式真空泵,所述气流干燥管与旋风分离器入口连接,所述旋风分离器底部出口经关风器与真空盘式干燥器进料口连接,所述真空盘式干燥器与水环式真空泵连接,所述真空盘式干燥器内设有中心转轴,所述中心转轴上设有多层干燥盘,所述干燥盘设有进水口和出水口。本发明通过在气流干燥后低水蒸气运行工段提供负压干燥环境,既降低了蒸发MBS物料残余水份的温度,又能够使MBS物料处在低氧含量下,可避免爆燃发生的安全隐患。(The invention belongs to the technical field of MBS production equipment, and particularly relates to a drying device for MBS production, which comprises an airflow drying pipe, a vacuum disc type dryer and a water ring type vacuum pump, wherein the airflow drying pipe is connected with an inlet of a cyclone separator, an outlet at the bottom of the cyclone separator is connected with a feed inlet of the vacuum disc type dryer through an air seal machine, the vacuum disc type dryer is connected with the water ring type vacuum pump, a central rotating shaft is arranged in the vacuum disc type dryer, a plurality of layers of drying discs are arranged on the central rotating shaft, and the drying discs are provided with water inlets and water outlets. The invention provides a negative pressure drying environment through the low-water-vapor operation working section after the air flow drying, thereby not only reducing the temperature for evaporating the residual water of the MBS material, but also leading the MBS material to be in low oxygen content and avoiding the potential safety hazard generated by deflagration.)

1. The utility model provides a drying device is used in MBS production, includes air current drying tube (3), vacuum disc dryer (8) and water ring vacuum pump (7), its characterized in that: the air flow drying pipe (3) is connected with an inlet of a cyclone separator (5), an outlet at the bottom of the cyclone separator (5) is connected with a feed inlet of a vacuum disc type dryer (8) through an air seal machine (4), the vacuum disc type dryer (8) is connected with a water ring type vacuum pump (7), a central rotating shaft (17) is arranged in the vacuum disc type dryer (8), a plurality of layers of drying discs (13) are arranged on the central rotating shaft (17), and a water inlet (15) and a water outlet (14) are formed in each drying disc (13).

2. The drying device for MBS production according to claim 1, wherein: and a discharge hole at the bottom of the vacuum disc type dryer (8) is provided with a related air blower (4).

3. The drying device for MBS production according to claim 1, wherein: the drying disc (13) is provided with a rake type pushing sheet (16).

4. The drying device for MBS production according to claim 1, wherein: a water inlet (15) of a drying tray (13) at the bottommost layer of the vacuum tray type dryer is connected with a circulating water tank (10) through a circulating water pump, and a water outlet (14) is connected with the circulating water tank (10) through a pipeline.

5. The drying device for MBS production according to claim 4, characterized in that: a water inlet (15) of a drying disc (13) on the upper layer of the drying disc (13) on the bottommost layer of the vacuum disc type dryer is connected with a water outlet of a hot water tank (6), and a water outlet (14) is connected with a water inlet of the hot water tank (6).

6. The drying device for MBS production according to claim 1, wherein: a cloth bag is connected in series between the vacuum disc type dryer (8) and the water ring type vacuum pump (7).

Technical Field

The invention belongs to the technical field of MBS production equipment, and particularly relates to a drying device for MBS production.

Background

MBS is a terpolymer prepared from methyl methacrylate (M), butadiene (B) and styrene (S) by emulsion graft polymerization. It has good compatibility with PVC, higher impact strength, excellent surface quality of products and good thermal stability. Meanwhile, the PVC hard product transparent impact modifier is extremely low in whitening property and easy to form, so that the PVC hard product transparent impact modifier is mainly used as a transparent impact modifier for PVC hard products, can improve the impact resistance and the processability of PVC products, and can keep the original optical performance of PVC resin.

The MBS production drying process comprises direct spray drying, and airflow tube and ebullated bed drying or double airflow drying. The MBS product obtained by the first direct spray drying process has poor transparency and particle shape and high unit energy consumption, and the second direct spray drying process has complicated pipeline equipment, large equipment volume, multiple dead corners and difficult cleaning. The two drying modes are operated under the condition of oxygen enrichment and high temperature, and the MBS powder product has the problems of easy oxidation and easy deflagration, so that the production process has larger potential safety hazard.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the drying device for MBS production overcomes the defects of the prior art, provides a negative pressure drying environment through a low-water-vapor operation working section after airflow drying, reduces the temperature for evaporating residual water of MBS materials, and can also ensure that the MBS materials are in low oxygen content, thereby avoiding potential safety hazards caused by deflagration.

The invention is realized by adopting the following technical scheme:

the drying device for MBS production comprises an airflow drying pipe, a vacuum disc type dryer and a water ring type vacuum pump, wherein the airflow drying pipe is connected with an inlet of a cyclone separator, an outlet at the bottom of the cyclone separator is connected with a feed inlet of the vacuum disc type dryer through an air seal device, the vacuum disc type dryer is connected with the water ring type vacuum pump, a central rotating shaft is arranged in the vacuum disc type dryer, a plurality of layers of drying discs are arranged on the central rotating shaft, and the drying discs are provided with water inlets and water outlets.

Preferably, an air seal machine is arranged at a discharge port at the bottom of the vacuum disc dryer, so that the sealing performance of the vacuum disc dryer is guaranteed.

Preferably, the drying disc is provided with a rake type pushing sheet.

Preferably, the water inlet of the drying tray at the bottommost layer of the vacuum tray type dryer is connected with the circulating water tank through a circulating water pump, and the water outlet of the drying tray is connected with the circulating water tank through a pipeline. Circulating water introduced into the bottommost drying disc can cool the materials so as to prevent the high-temperature MBS material from being exposed to the atmospheric environment and dewing to influence the water content of the MBS product

Preferably, the water inlets of the drying trays on the upper layer of the drying tray on the bottommost layer of the vacuum tray dryer are connected with the water outlet of the hot water tank, and the water outlets of the drying trays are connected with the water inlet of the hot water tank.

Preferably, a cloth bag is arranged between the vacuum disc type dryer and the water ring type vacuum pump in series, so that the loss of materials along with the air suction of the vacuum pump is prevented.

Compared with the prior art, the invention has the following beneficial effects:

1. the MBS material in the vacuum disc type dryer reduces the water evaporation temperature, accelerates the evaporation rate, reduces the energy consumption and improves the drying efficiency and quality under the low-pressure condition.

2. The invention simplifies the drying process, provides a negative pressure drying environment at the low-water-vapor operation working section after the airflow drying, reduces the temperature for evaporating the residual water of the MBS material, enables the MBS material to be in a low-oxygen content state, and can avoid the potential safety hazard caused by deflagration.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the construction of the vacuum tray dryer of the present invention;

FIG. 3 is a cross-sectional top view taken at A in FIG. 2;

in the figure: 1. a steam heater; 2. a screw feeder; 3. an air flow drying tube; 4. a wind seal machine; 5. a cyclone separator; 6. a hot water tank; 7. a water-ring vacuum pump; 8. a vacuum tray dryer; 9. an exhaust gas treatment device; 10. a circulating water tank; 11. a material accumulating box; 12. a bag-type dust collector; 13. drying the disc; 14. a water outlet; 15. a water inlet; 16. a rake type pushing sheet; 17. a central rotating shaft.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1-3, the drying device for MBS production includes a steam heater 1, a spiral feeder 2, an air flow drying tube 3, a vacuum disc dryer 8, a water ring vacuum pump 7, a waste gas treatment device 9, a material accumulation box 11, and a bag-type dust collector 12, the air flow drying tube 3 is connected to an inlet of a cyclone separator 5, an outlet at the bottom of the cyclone separator 5 is connected to a feed inlet of the vacuum disc dryer 8 through an air seal machine 4, an air outlet at the upper part of the cyclone separator 5 is connected to the waste gas treatment device 9, the vacuum disc dryer 8 is connected to the water ring vacuum pump 7, a central rotating shaft 17 is arranged in the vacuum disc dryer 8, a plurality of layers of drying discs 13 are arranged on the central rotating shaft 17, and the drying discs 13 are provided with a water inlet 15 and a water outlet 14.

The steam heater 1 is connected with the airflow drying pipe 3 and the hot water tank 6 to provide a heat source for the airflow drying pipe. The spiral feeder 2 is connected with the inlet of the pneumatic drying tube 3.

The discharge port at the bottom of the vacuum disc type dryer 8 is provided with an air seal machine 4, the discharge port is connected with a material accumulation box 11 through the air seal machine 4, and the material accumulation box 11 is connected with a bag-type dust collector 12.

The drying disk 13 is provided with a rake type pushing sheet 16.

A water inlet 15 of a drying tray 13 at the bottommost layer of the vacuum tray type dryer is connected with the circulating water pool 10 through a circulating water pump, and a water outlet 14 is connected with the circulating water pool 10 through a pipeline.

The water inlets 15 of the drying discs 13 on the upper layer of the drying disc 13 on the bottommost layer of the vacuum disc type dryer are connected with the water outlets of the hot water tank 6, and the water outlets 14 are connected with the water inlets of the hot water tank 6.

A cloth bag is connected in series between the vacuum disc type dryer 8 and the water ring type vacuum pump 7.

The working principle and the process are as follows:

MBS wet material gets into airflow drying tube 3 through spiral feeder 2 in, after airflow drying tube 3 is dry, use cyclone 5 to collect the MBS material (moisture content 8 ~ 9%) of high water content, the material gets into in vacuum disc dryer 8 through air seal machinery 4, gaseous entering exhaust treatment device 9 handles evacuation after reaching standard, 8 cavities of vacuum disc dryer use water ring vacuum pump 7 pump-out gaseous phase, make 8 cavities of vacuum disc dryer vacuum degree keep less than-20 KPa, oxygen content < 10%, set up several layers along the material flow direction in the vacuum disc dryer 8 and lead to 90 ℃ of hot water drying tray 13 that circulates, arrange rake formula on the drying tray 13 and promote piece 16, make the material move along drying tray 13 surface. Circulating cooling water is introduced into the drying disc 13 at the bottommost layer of the vacuum disc dryer 8 to cool the materials so as to prevent the high-temperature MBS material from being exposed to the atmospheric environment to form dew and influence the moisture content of the MBS product, the dried materials enter the material accumulating box 11 through the air seal machine 4 at the discharge hole at the bottom of the vacuum disc dryer 8, and the materials in the material accumulating box 11 enter the bag-type dust collector 12 to be subjected to dust removal and collection to obtain dry materials.

Of course, the foregoing is only a preferred embodiment of the invention and should not be taken as limiting the scope of the embodiments of the invention. The present invention is not limited to the above examples, and equivalent changes and modifications made by those skilled in the art within the spirit and scope of the present invention should be construed as being included in the scope of the present invention.