A spray granulation drying apparatus

Abstract

The utility model discloses a kind of spray granulation drying devices, including feed pump, feed pipeline, first air blower, first heater, drying host, second air blower, discharge pipeline, first cyclone separator, vibrating screen, second cyclone separator, third cyclone separator, dust collector, induced draft fan and back powder pipeline.Three-way pipeline is connected with discharge pipeline, second discharge pipe of discharge device, fine powder pipeline of vibrating screen and third discharge pipe of second cyclone separator are respectively.The exhaust pipe of first cyclone separator is communicated with the inner chamber of drying host by back powder pipeline.The utility model directly sends dust into drying host, contacts liquid material to form microparticle, to directly utilize dust in device, without sending dust to reaction kettle and raw material after mixing again into drying host, improve drying efficiency and output, reduce artificial and consumption, clean environment.

Description

Technical Field

[0001] This utility model relates to the field of drying and granulation technology, specifically to a spray granulation and drying device. Background Technology

[0002] Spray drying granulation equipment is suitable for preparing pesticide formulations with high requirements for flowability, solubility, dust control and content uniformity. It usually consists of a feeding system, a drying system, a dust removal system, a heating system and an electrical system.

[0003] For example, Chinese patent document CN 203886208 U (application number 201420263415.3) discloses a spray drying device for pesticide microcapsule solid formulations, including a drying tower and a drying tower discharge valve located at the bottom of the drying tower. The spray drying device includes a slurry feeder, a feed pump, and an atomizer connected in sequence. The atomizer is located above the drying tower. A cold air jacketed fan is provided on one side of the drying tower. The drying tower discharge valve is connected to the gas inlet of a cyclone separator, and the gas outlet of the cyclone separator is connected to an induced draft fan through an air regulating valve.

[0004] In most existing spray drying granulation devices, the collected fine powder is usually sent to a reaction vessel to be mixed with the raw materials before being sent to the drying host. This processing method has low production efficiency and cannot be used for continuous production. Utility Model Content

[0005] The technical problem to be solved by this utility model is that the existing technology sends the collected fine powder to the reaction vessel to mix with the raw materials and then sends it to the drying host. The present invention provides a spray granulation drying device with continuous closed operation and the returned powder directly enters the drying host for granulation and drying.

[0006] The technical solution for achieving the purpose of this utility model is a spray granulation and drying device, including a feed pump, a feed pipeline, a first blower, a first heater, a drying host, a second blower, a discharge pipeline, a first cyclone separator, a vibrating screen, a second cyclone separator, a third cyclone separator, a dust collector, an induced draft fan, and a powder return pipeline.

[0007] The feed pump is connected to the first nozzle on the top of the drying host through the feed pipeline. The first heater includes an air inlet, an air outlet and a heat exchange unit. The air inlet is connected to the air outlet of the first blower and the air outlet is connected to the top of the drying host. The top of the drying host is provided with an exhaust gas outlet. The exhaust gas outlet is connected to the second cyclone separator through an exhaust gas pipe. The second cyclone separator, the third cyclone separator, the dust collector and the induced draft fan are connected in sequence through pipes.

[0008] The discharge port at the bottom of the drying unit is connected to the discharge pipe. One end of the discharge pipe is connected to the air outlet of the second blower, and the other end is connected to the air inlet of the first cyclone separator.

[0009] The vibrating screen includes a feed inlet, a finished product outlet, and a fine powder outlet located at the top and connected to the first cyclone separator. The fine powder outlet is connected to the discharge pipe via a pipe. The first cyclone separator includes an air inlet, a discharge outlet, and an exhaust pipe. The discharge outlet is connected to the feed inlet of the vibrating screen located below it, and the exhaust pipe is connected to the inner cavity of the drying host through a powder return pipe.

[0010] Since the entire system is under negative and positive pressure, a double control valve is installed on the pipe between the discharge port at the bottom of the drying host and the discharge pipe, and a double control valve is installed on the fine powder pipe between the vibrating screen and the discharge pipe.

[0011] The second cyclone separator includes an air inlet, a discharge outlet, and an exhaust pipe. The discharge outlet is connected to the discharge pipeline through a third discharge pipe.

[0012] Furthermore, a dual control valve is installed on the third discharge pipe.

[0013] There are three pipes connected to the discharge pipe: the second discharge pipe of the discharge device, the fine powder pipe of the vibrating screen, and the third discharge pipe of the second cyclone separator. For ease of observation, the section of pipe between all the double valves is made of glass.

[0014] The drying host includes an upper part with a cylindrical inner cavity and a lower part with a conical inner cavity. The exhaust pipe of the first cyclone separator is connected to the inner cavity of the lower part of the drying host through a powder return pipe.

[0015] The drying unit also includes a second nozzle located at the bottom.

[0016] The feed pipeline includes a first branch and a second branch; the feed inlet of the first branch is connected to the discharge outlet of the feed pump, and the discharge outlet of the first branch is connected to the first nozzle; the feed inlet of the second branch is connected to the discharge outlet of the feed pump, and the discharge outlet of the second branch is connected to the second nozzle.

[0017] The spray granulation drying device also includes a discharge device, a third blower, and a second heater.

[0018] The discharge port at the bottom of the drying host is connected to the inner cavity of the discharge device through the first discharge pipe. The discharge device includes a second discharge pipe, and the discharge port of the second discharge pipe is connected to the discharge pipeline.

[0019] The second heater includes an air inlet, an air outlet, and a heat exchange unit. The air outlet of the third blower is connected to the air inlet of the second heater, and the air outlet of the second heater is connected to the bottom of the discharge device.

[0020] The exhaust pipe of the second cyclone separator is connected to the air inlet of the third cyclone separator through a pipe. The exhaust pipe of the third cyclone separator is connected to the air inlet of the dust collector. The air outlet of the dust collector is connected to the induced draft fan through a pipe.

[0021] This invention has the following positive effects: The fine powder obtained from the vibrating screen and the second cyclone separator, along with the microparticles collected from the discharge device, are fed together into the first cyclone separator. After separation by the first cyclone separator, the dust flowing out of the exhaust port of the first cyclone separator is sent to the lower part of the drying host, where it comes into contact with the liquid material sprayed from the second nozzle to form microparticles. Thus, the dust can be used directly in the device, eliminating the need to send the dust to the reaction vessel and mix it with the raw materials before sending it to the drying host. This improves drying efficiency and output, reduces labor and consumption, and cleans the environment.

[0022] This invention is applicable to the preparation of fine particles, such as dry suspensions, with a particle size between 0.5-1 mm. Since the dust has already been partially granulated, the process time in the spray drying tower is short. It is only necessary to send the dust to the lower part of the drying host and let it come into contact with the liquid material sprayed from the second nozzle to obtain particles within the target range. If it is sent to the top of the drying host, larger particles will be obtained. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 for Figure 1 Enlarged diagram showing the connection between the first cyclone separator, vibrating screen and related pipelines.

[0025] The markings in the above-mentioned attached figures are as follows: feed pump 1, feed pipe 2, first branch 2-1, second branch 2-2, first blower 3, first heater 4, drying host 5, upper part 5-1, lower part 5-2, first nozzle 5-3, second nozzle 5-4, first discharge pipe 5-5, discharge device 6, second discharge pipe 6-1, second blower 7, discharge pipe 8, first cyclone separator 9, air inlet 9-1, discharge outlet 9-2, exhaust pipe 9-3, vibrating screen 10, finished product outlet 10-1, coarse particle outlet 10-2, fine powder outlet 10-3, fine powder pipe 10-4, second cyclone separator 11, third discharge pipe 11-1, third cyclone separator 12, dust collector 13, induced draft fan 14, third blower 15, second heater 16, powder return pipe 17, exhaust gas pipe 18. Detailed Implementation

[0026] The following describes some of the possible embodiments of this utility model, intended to provide a basic understanding of the utility model, and is not intended to identify the key or decisive elements of the utility model or limit the scope of protection to be provided. It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose other interchangeable implementations without changing the essential spirit of the utility model. Therefore, the following specific embodiments are merely illustrative examples of the technical solution of this utility model and should not be considered as the entirety of this utility model or as a limitation or restriction of the technical solution of this utility model.

[0027] In the description of the embodiments of this application, the technical terms "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having” and any variations thereof in the specification, claims and foregoing drawings of this application are intended to cover non-exclusively; the terms “first,” “second,” etc. in the specification and claims or foregoing drawings are used to distinguish different objects and not to describe a particular order or hierarchy.

[0029] (Example 1) See Figure 1 and Figure 2 The spray granulation drying device of this embodiment includes a feed pump 1, a feed pipeline 2, a first blower 3, a first heater 4, a drying host 5, a discharge device 6, a second blower 7, a discharge pipe 8, a first cyclone separator 9, a vibrating screen 10, a second cyclone separator 11, a third cyclone separator 12, a dust collector 13, an induced draft fan 14, a third blower 15, a second heater 16, a powder return pipe 17, and other connecting pipes.

[0030] The drying host 5 includes an upper part 5-1 with a cylindrical inner cavity and a lower part 5-2 with a conical inner cavity. A first nozzle 5-3 and a second nozzle 5-4 are disposed inside the drying host 5. The first nozzle 5-3 is located at the top of the drying host 5, facing downwards; the second nozzle 5-4 is located at the bottom of the drying host 5, facing upwards. The discharge port at the bottom of the drying host 5 is connected to the discharge device 6 through a first discharge pipe 5-5.

[0031] The feed pump 1 is connected to the feed pipeline 2. The feed pipeline 2 includes a first branch 2-1 and a second branch 2-2. The inlet of the first branch 2-1 is connected to the outlet of the feed pump 1, and the outlet of the first branch 2-1 is connected to the first nozzle 5-3. The inlet of the second branch 2-2 is connected to the outlet of the feed pump 1, and the outlet of the second branch 2-2 is connected to the second nozzle 5-4. A valve is installed on the second branch 2-2.

[0032] The air outlet of the first blower 3 is connected to the first heater 4.

[0033] The first heater 4 includes an air inlet, an air outlet, and a heat exchange unit; wherein the heat exchange unit is either electrically heated or steam heated.

[0034] The outlet of the first blower 3 is connected to the inlet of the first heater 4, and the outlet of the first heater 4 is connected to the top of the drying host 5. Thus, the hot air heated by the first heater 4 enters the inner cavity of the drying host 5 from the top. Consequently, the material is ejected from the first nozzle 5-3, forming a parallel flow with the hot air entering from the top of the drying host 5, and moves downwards.

[0035] The discharge port at the bottom of the drying host 5 is connected to the inner cavity of the discharge device 6 through the first discharge pipe 5-5, and hot air from the third blower 15 and the second heater 16 is introduced into the discharge device 6.

[0036] The outlet of the third blower 15 is connected to the second heater 16. The second heater 16 includes an air inlet, an air outlet, and a heat exchange unit; wherein the heat exchange unit is either electrically heated or steam heated. The outlet of the third blower 15 is connected to the air inlet of the second heater 16, and the air outlet of the second heater 16 is connected to the bottom of the discharge device 6.

[0037] The discharge device 6 includes a second discharge pipe 6-1, on which a dual control valve is installed, and the discharge port of the second discharge pipe 6-1 is connected to the discharge pipe 8.

[0038] Alternatively, in some embodiments, the discharge port at the bottom of the drying host 5 is directly connected to the discharge pipe 8 via a pipe. In this structure, the discharge device 6, the third blower 15, and the second heater 16 are omitted.

[0039] In some embodiments, only the discharge device 6 is omitted, and hot air from the third blower 15 and the second heater 16 enters the drying host 5 from the bottom.

[0040] See Figure 2 One end of the discharge pipe 8 is connected to the air outlet of the second blower 7, and the other end is connected to the air inlet of the first cyclone separator 9.

[0041] The first cyclone separator 9 includes an air inlet 9-1, a discharge outlet 9-2, and an exhaust pipe 9-3. The discharge outlet 9-2 is connected to the feed inlet of the vibrating screen 10 located below it, and the exhaust pipe 9-3 is connected to the conical lower part 5-2 of the drying host 5 through the powder return pipe 17.

[0042] The vibrating screen 10 includes a feed inlet connected to the first cyclone separator 9 at the top, a finished product outlet 10-1, a coarse particle outlet 10-2, and a fine powder outlet 10-3. The coarse particle outlet 10-2 is located above the finished product outlet 10-1, and the fine powder outlet 10-3 is located below the finished product outlet 10-1. The fine powder outlet 10-3 is connected to the discharge pipe 8 via a fine powder pipe 10-4, and a dual control valve is installed on the fine powder pipe 10-4.

[0043] The top of the drying unit 5 is provided with an exhaust gas outlet, which is connected to the air inlet of the second cyclone separator 11 through an exhaust gas pipe 18.

[0044] The second cyclone separator 11 includes an air inlet, a discharge outlet and an exhaust pipe. Its discharge outlet is connected to the discharge pipe 8 through the third discharge pipe 11-1, and a dual control valve is installed on the third discharge pipe 11-1.

[0045] From this point on, three pipes are connected to the discharge pipe 8: the second discharge pipe 6-1 of the discharge device 6, the fine powder pipe 10-4 of the vibrating screen 10, and the third discharge pipe 11-1 of the second cyclone separator 11.

[0046] Each of the three pipelines equipped with a dual control valve is connected to a control system, and the opening and closing of the dual valves is automatically controlled by a PLC program. For ease of observation, the section of pipeline between all dual valves is made of glass.

[0047] The exhaust pipe of the second cyclone separator 11 is connected to the air inlet of the third cyclone separator 12 through a pipe. The exhaust pipe of the third cyclone separator 12 is connected to the air inlet of the dust collector 13. The air outlet of the dust collector 13 is connected to the induced draft fan 14 through a pipe.

[0048] The discharge ports of the first cyclone separator 9, the second cyclone separator 11, the third cyclone separator 12, and the dust collector 13 are each equipped with a star-shaped discharge valve. The material collected from the discharge ports of the third cyclone separator 12 and the dust collector 13 is processed according to the usual processing method.

[0049] When the device of this utility model is working, the liquid material that has been ground is pressurized by the feed pump 1 and sprayed into the cavity from the first nozzle 5-3 at the top of the drying host 5 to form small liquid particles. These particles come into contact with the hot air from the first blower 3 and the first heater 4, which exchange heat and quickly evaporate the moisture in the liquid material, forming microparticles. The microparticles enter the discharge device 6 from the first discharge pipe 5-5 at the bottom of the drying host 5. After the discharge device 6 comes into contact with the hot air from the third blower 15 and the second heater 16, the particles enter the discharge pipe 8 through the second discharge pipe 6-1. The material in the discharge pipe 8 is sent to the first cyclone separator 9 by the second blower 7. After being separated by the first cyclone separator 9, the material enters the vibrating screen 10 for screening. The qualified product flows out of the finished product outlet 10-1 and is packaged. The coarse product is collected from the coarse particle outlet 10-2 and re-enters the reactor for grinding and reuse. The fine powder enters the discharge pipe 8 from the fine powder outlet 10-3 through the fine powder pipe 10-4.

[0050] The exhaust gas containing a small amount of dust flowing out from the top of the dryer 5 is processed by the second cyclone separator 11, the third cyclone separator 12, and the dust collector 13, and then drawn out by the induced draft fan 14 for further treatment (water washing discharge).

[0051] Three pipes are connected to the discharge pipe 8: the second discharge pipe 6-1 of the discharge device 6, the fine powder pipe 10-4 of the vibrating screen 10, and the third discharge pipe 11-1 of the second cyclone separator 11. One end of the discharge pipe 8 is connected to the air outlet of the second blower 7, and the other end is connected to the air inlet of the first cyclone separator 9. The exhaust pipe 9-3 of the first cyclone separator 9 is connected to the conical lower part 5-2 of the dryer 5 through the powder return pipe 17. Due to the suction of the induced draft fan 14, the dryer 5 is under negative pressure. The dust-containing gas (fine powder and particles) flowing out from the exhaust pipe 9-3 of the first cyclone separator 9 is drawn into the lower part 5-2 of the dryer 5. In the lower part 5-2, the dust comes into contact with the liquid sprayed from the second nozzle 5-4 to form particles. The above process is repeated.

[0052] Therefore, this utility model feeds the fine powder obtained from the vibrating screen 10 and the second cyclone separator 11, along with the microparticles collected from the discharge device 6, into the first cyclone separator. After separation by the first cyclone separator, the dust flowing out of the exhaust port of the first cyclone separator is sent to the lower part of the drying host 5, where it comes into contact with the liquid material sprayed from the second nozzle 5-4 to form microparticles. Thus, the dust is directly utilized in the device, eliminating the need to send the dust to the reaction vessel and mix it with the raw materials before sending it into the drying host. This improves drying efficiency and output, reduces labor and consumption, and cleans the environment.

Claims

1. A spray granulation and drying device, characterized in that: It includes a feed pump (1), a feed pipeline (2), a first blower (3), a first heater (4), a drying host (5), a second blower (7), a discharge pipeline (8), a first cyclone separator (9), a vibrating screen (10), a second cyclone separator (11), a third cyclone separator (12), a dust collector (13), an induced draft fan (14), and a powder return pipeline (17). The feed pump (1) is connected to the first nozzle (5-3) on the top of the drying host (5) through the feed pipe (2). The first heater (4) includes an air inlet, an air outlet and a heat exchange unit. The air inlet is connected to the air outlet of the first blower (3) and the air outlet is connected to the top of the drying host (5). The top of the drying host (5) is provided with a tail gas outlet. The tail gas outlet is connected to the second cyclone separator (11) through the tail gas pipe (18). The second cyclone separator (11), the third cyclone separator (12), the dust collector (13) and the induced draft fan (14) are connected in sequence through pipes. The discharge port at the bottom of the drying host (5) is connected to the discharge pipe (8). One end of the discharge pipe (8) is connected to the air outlet of the second blower (7), and the other end is connected to the air inlet of the first cyclone separator (9). The vibrating screen (10) includes a feed inlet connected to the first cyclone separator (9) at the top, a finished product outlet (10-1) and a fine powder outlet (10-3), and the fine powder outlet (10-3) is connected to the discharge pipe (8) through a pipe; The first cyclone separator (9) includes an air inlet (9-1), a discharge outlet (9-2), and an exhaust pipe (9-3). The discharge outlet (9-2) is connected to the feed inlet of the vibrating screen (10) located below it, and the exhaust pipe (9-3) is connected to the inner cavity of the drying host (5) through the powder return pipe (17).

2. The spray granulation and drying apparatus according to claim 1, characterized in that: A double control valve is installed on the pipe between the discharge port at the bottom of the drying host (5) and the discharge pipe (8), and a double control valve is installed on the fine powder pipe (10-4) between the vibrating screen (10) and the discharge pipe (8).

3. The spray granulation and drying apparatus according to claim 1, characterized in that: The second cyclone separator (11) includes an air inlet, a discharge outlet and an exhaust pipe. The discharge outlet is connected to the discharge pipe (8) through the third discharge pipe (11-1).

4. The spray granulation and drying apparatus according to claim 1, characterized in that: A dual control valve is installed on the third discharge pipe (11-1).

5. The spray granulation and drying apparatus according to claim 1, characterized in that: The drying host (5) includes an upper part (5-1) with a cylindrical inner cavity and a lower part (5-2) with a conical inner cavity. The exhaust pipe (9-3) of the first cyclone separator (9) is connected to the inner cavity of the lower part (5-2) of the drying host (5) through the powder return pipe (17).

6. The spray granulation and drying apparatus according to claim 5, characterized in that: The drying unit (5) also includes a second nozzle (5-4) located at the bottom; The feed line (2) includes a first branch (2-1) and a second branch (2-2); The inlet of the first branch (2-1) is connected to the outlet of the feed pump (1), and the outlet of the first branch (2-1) is connected to the first nozzle (5-3); the inlet of the second branch (2-2) is connected to the outlet of the feed pump (1), and the outlet of the second branch (2-2) is connected to the second nozzle (5-4).

7. The spray granulation and drying apparatus according to claim 1, characterized in that: It also includes a discharge device (6), a third blower (15), and a second heater (16); The discharge port at the bottom of the drying host (5) is connected to the inner cavity of the discharge device (6) through the first discharge pipe (5-5). The discharge device (6) includes a second discharge pipe (6-1), and the discharge port of the second discharge pipe (6-1) is connected to the discharge pipe (8). The second heater (16) includes an air inlet, an air outlet and a heat exchange unit. The air outlet of the third blower (15) is connected to the air inlet of the second heater (16), and the air outlet of the second heater (16) is connected to the bottom of the discharge device (6).

8. The spray granulation and drying apparatus according to claim 1, characterized in that: The exhaust pipe of the second cyclone separator (11) is connected to the air inlet of the third cyclone separator (12) through a pipe. The exhaust pipe of the third cyclone separator (12) is connected to the air inlet of the dust collector (13). The air outlet of the dust collector (13) is connected to the induced draft fan (14) through a pipe.

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