Closed circulation single-cone drying system

Abstract

The utility model relates to a closed circulation single-cone drying system, and belongs to the technical field of material drying systems. Comprising a single-cone drying machine, an airflow distribution mechanism is arranged at the bottom of the single-cone drying machine, an air inlet is connected to the airflow distribution mechanism, an air outlet is formed in the single-cone drying machine, and a circulating pipeline is arranged between the air inlet and the air outlet; a first filter, a dust remover, a condenser, a fan, a heater and a second filter are sequentially arranged on the circulating pipeline, the first filter is arranged on the air outlet side, the second filter is arranged on the air inlet side, the circulating mechanism is started, circulating air is fed into the heater through the fan to be heated, and the dust remover is used for removing dust. Hot air enters the inner cavity of the single-cone drying machine through the air inlet and the airflow distribution mechanism, a solvent flows into the first filter to be filtered and then flows into the condenser to form a recycled solvent and clean gas, and then the clean gas returns to the fan. The drying efficiency and speed are improved, material pilling and blocking are avoided, energy is saved, and the environment-friendly requirement is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a closed circulation single cone drying system and belongs to the technical field of material drying system. BACKGROUND

[0002] At present, the single cone drying system usually uses vacuum drying-heat conduction mode. In the actual pharmaceutical process, the physical properties of the industrial product to be dried are various, and the above single cone dryer has a very limited application range. For example, the material has high water content, high viscosity and poor heat penetration, such as antibiotic intermediate raw materials. This mode has low drying efficiency in the initial stage of drying the wet material, and the final drying effect is not ideal. Moreover, it is prone to balling and blocking, resulting in drying difficulty or even inability to dry. Therefore, there is an urgent need for a system that can solve the above problems and achieve safety and environmental protection. SUMMARY

[0003] The utility model provides a closed circulation single cone drying system to solve the above technical problems, which improves the drying efficiency and drying speed, greatly reduces the balling and blocking of the material, saves energy, and meets the environmental protection requirements.

[0004] The utility model adopts the technical scheme that a closed circulation single cone drying system comprises a single cone dryer, a circulating pipeline is connected to the single cone dryer, a condenser and a fan are arranged on the circulating pipeline to form a closed circulation system. When the closed circulation system is opened, circulating air enters the inner cavity of the single cone dryer through the fan, and a large amount of solvent flows into the condenser through the circulating pipeline to form recovered solvent and clean gas. The recovered solvent is collected in a solvent collection tank, and then the clean gas returns to the fan.

[0005] An air flow distribution mechanism is arranged at the bottom of the single cone dryer, an air inlet is connected to the air flow distribution mechanism, an air outlet is arranged on the single cone dryer, and the circulating pipeline is connected to the air inlet and the air outlet.

[0006] The air flow distribution mechanism is an annular air flow distribution mechanism or a hole plate air flow distribution mechanism.

[0007] The annular air flow distribution mechanism comprises an annular pipe, an annular channel is formed in the inner cavity of the annular pipe, the air inlet is arranged on the outer side of the annular pipe, one end of the air inlet is connected to the circulating pipeline, the other end of the air inlet is connected to the annular pipe, the inner side of the annular pipe is connected to a plurality of distribution pipes arranged in a ring shape, fluidization nozzles are arranged at the end portions of the distribution pipes, and the fluidization nozzles are arranged in the inner cavity of the single cone dryer.

[0008] The hole plate air flow distribution mechanism comprises an inner annular plate and an outer annular plate, the inner annular plate is arranged in the outer annular plate, and a gap is left between the two to form a hole plate, the hole plate is arranged on the inner wall at the bottom of the single cone dryer, the air inlet is in communication with the gap, and a plurality of air inlet holes are arranged on the inner annular plate.

[0009] The circulating pipeline is further provided with a first filter, a dust remover, a heater and a second filter, the first filter is arranged at the air outlet side, the second filter is arranged at the air inlet side, the dust remover is arranged between the first filter and the condenser, and the heater is arranged between the fan and the second filter.

[0010] A vacuum pipeline is connected to the circulating pipeline, and the vacuum pipeline is arranged between the first filter and the dust remover.

[0011] Compared with the prior art, the closed cycle single-cone drying system has the advantages that hot air drying is adopted, the drying efficiency and speed are improved, material balling is avoided, energy is saved, and working time is greatly reduced. Through the recycling of hot air, the solvent does not leak, and the environmental protection requirement is met. In combination with the airflow distribution mechanism, the fluidization state in the single-cone cylinder is enhanced, and the drying efficiency is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a schematic view of a closed cycle single-cone drying system according to an embodiment of the present application;

[0013] Figure 2 It is a schematic view of an annular airflow distribution mechanism;

[0014] Figure 3 It is a top view of Figure 2

[0015] Figure 4 It is a schematic view of a perforated plate airflow distribution mechanism;

[0016] Figure 5 It is a top view of Figure 4

[0017] In the drawing, 1 is a single-cone dryer, 2 is a first filter, 3 is a circulating pipeline, 4 is a vacuum pipeline, 5 is a vacuum port, 6 is a dust remover, 7 is a condenser, 8 is a fan, 9 is a heater, 10 is a second filter, 11 is an annular airflow distribution mechanism, 11.1 is an annular pipe, 11.2 is a distribution pipe, 11.3 is a fluidization nozzle, 12 is a perforated plate airflow distribution mechanism, 12.1 is a perforated plate, 12.2 is an outer annular plate, 12.3 is an inner annular plate, and 12.4 is an air inlet hole. DETAILED DESCRIPTION

[0018] The present application will be further described in detail below with reference to the embodiments of the drawing.

[0019] As Figure 1 ​​As shown in the figure, a closed-loop single-cone drying system in this embodiment includes a single-cone dryer 1. An airflow distribution mechanism is provided at the bottom of the dryer 1, connected to an air inlet. The dryer 1 is provided with an air outlet, and a circulation pipeline 3 is provided between the air inlet and the air outlet, connecting the inner cavity of the dryer 1 with the circulation pipeline 3. The gas distribution mechanism can be an annular airflow distribution mechanism 11 and an orifice plate airflow distribution mechanism 12, which are used to enhance the fluidization state within the single-cone dryer. The circulation pipeline 3 is sequentially provided with a first filter 2, a dust collector 6, a condenser 7, a fan 8, a heater 9, and a second filter 10. The first filter 2 is located on the air outlet side, and the second filter 10 is located on the air inlet side, forming a closed-loop mechanism. When the closed-loop mechanism is activated, circulating air is fed by fan 8 into heater 9 for heating. The heated air then enters the inner cavity of the single-cone dryer 1 through the air inlet and airflow distribution mechanism, efficiently and quickly discharging a large amount of solvent through the air outlet into the circulation pipeline. After being filtered by the first filter, it enters the condenser, forming recovered solvent and clean gas. The recovered solvent is collected in the solvent collection tank. The clean gas then returns to the fan and enters the heater and second filter. The heater heats the clean gas, which is then filtered again by the second filter before flowing into the single-cone dryer for recycling. The circulation pipeline 3 is also connected to a vacuum pump 4, which is located between the first filter 2 and the dust collector 6. The vacuum port 5 on the vacuum pump 4 is connected to the vacuum device. If the moisture content of the material has not yet reached the required level and is low, the vacuum device is activated, switching to vacuum drying.

[0020] Valves are respectively provided on the circulation pipeline and the vacuum pipeline to control the conduction and closing of the circulation pipeline and the vacuum pipeline.

[0021] like Figure 2 、 3 As shown, the annular airflow distribution mechanism 11 comprises an annular tube 11.1, whose inner cavity forms an annular channel. An air inlet is located outside of annular tube 11.1, one end of which is connected to the circulation pipeline, and the other end is connected to the annular tube. Annular tube 11.1 is connected to multiple circumferentially arranged distribution pipes 11.2. Fluidizing nozzles 11.3 are installed at the ends of distribution pipes 11.2. Fluidizing nozzles 11.3 are located within the inner cavity of the single-cone dryer 1. Hot air enters the annular channel through the air inlet, then enters the single-cone dryer through the distribution pipes, where it is ejected by the fluidizing nozzles, enhancing the boiling effect.

[0022] like Figure 4 、 5As shown, the orifice plate air flow distribution mechanism 12 comprises an inner annular plate 12.3 and an outer annular plate 12.2, the inner annular plate 12.3 is arranged in the outer annular plate 12.2, and a gap is left between the two, thereby forming an orifice plate 12.1. The orifice plate 12.1 is arranged on the inner wall of the bottom of the single-cone dryer. The air inlet is communicated with the gap, and a plurality of uniformly distributed air inlets 12.4 are arranged on the inner annular plate. The hot air enters the gap through the air inlet, and then is uniformly blown into the cavity of the single-cone dryer through the air inlets on the inner annular plate, thereby strengthening the boiling effect.

[0023] The present application adopts hot air drying, improves the drying efficiency and speed, avoids material pilling and blocking, saves energy, and greatly reduces the working time. Through the recycling of hot air, the solvent will not leak, which meets the environmental protection requirements; protective gas (such as N2) can also be introduced into the closed circulation mechanism, which can effectively prevent the flammable and explosive gas from catching fire or explosion. In addition, cooperating with the air flow distribution mechanism, the fluidization state in the single-cone cylinder is enhanced, and the drying efficiency is further improved.

[0024] In addition to the above-mentioned embodiments, the utility model also includes other implementation manners, and the technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the utility model claims.

Claims

1. A closed cycle single cone drying system characterized by: The single-cone dryer is connected with a circulating pipeline, the circulating pipeline is provided with a condenser and a fan, forming a closed circulating system, opening the closed circulating system, circulating air enters the single-cone dryer through the fan, a large amount of solvent flows into the condenser through the circulating pipeline, forming recovered solvent and clean gas, the recovered solvent is collected in a solvent collection tank, and then the clean gas returns to the fan.

2. A closed cycle single cone drying system as claimed in claim 1, wherein: The bottom of the single-cone dryer is provided with an air flow distribution mechanism, the air flow distribution mechanism is connected with an air inlet, and the single-cone dryer is provided with an air outlet, and the circulating pipeline is connected with the air inlet and the air outlet.

3. A closed cycle single cone drying system as claimed in claim 2, wherein: The air flow distribution mechanism is a ring-shaped air flow distribution mechanism or a hole plate air flow distribution mechanism.

4. A closed cycle single cone drying system as claimed in claim 3, wherein: The ring-shaped air flow distribution mechanism comprises a ring-shaped pipe, an annular channel is formed in the inner cavity of the ring-shaped pipe, the air inlet is arranged on the outer side of the ring-shaped pipe, one end of the air inlet is connected with the circulating pipeline, the other end of the air inlet is connected with the ring-shaped pipe, the inner side of the ring-shaped pipe is connected with a plurality of distribution pipes arranged in a ring shape, the end of the distribution pipe is provided with a fluidization nozzle, and the fluidization nozzle is arranged in the inner cavity of the single-cone dryer.

5. A closed cycle single cone drying system as claimed in claim 3, wherein: The hole plate air flow distribution mechanism comprises an inner ring-shaped plate and an outer ring-shaped plate, the inner ring-shaped plate is arranged in the outer ring-shaped plate, and a gap is left between the two, forming a hole plate, the hole plate is arranged on the inner wall of the bottom of the single-cone dryer, the air inlet is in communication with the gap, and a plurality of uniformly distributed air inlet holes are formed in the inner ring-shaped plate.

6. A closed cycle single cone drying system as claimed in claim 2, wherein: The circulating pipeline is further provided with a first filter, a dust remover, a heater and a second filter, the first filter is arranged on the side of the air outlet, the second filter is arranged on the side of the air inlet, the dust remover is arranged between the first filter and the condenser, and the heater is arranged between the fan and the second filter.

7. A closed cycle single cone drying system as claimed in claim 1, wherein: The circulating pipeline is connected with a vacuum pipeline, and the vacuum pipeline is arranged between the first filter and the dust remover.

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