Flash dryer system with closed organic solvent recovery structure

Abstract

The utility model belongs to the technical field of flash drying machines, and discloses a flash drying machine system with a closed organic solvent recovery structure, which comprises a flash drying machine, an induced draft fan and an electric cabinet, a stirring and crushing mechanism is arranged at the bottom of the flash drying machine, an air inlet of the flash drying machine is positioned on one side of the stirring and crushing mechanism, and an air outlet of the flash drying machine is positioned on the other side of the stirring and crushing mechanism. An air inlet of the flash drying machine is connected with a heater through a pipeline, the heater heats gas entering the flash drying machine, a feeding port of the flash drying machine is connected with a feeding device through a pipeline, and the feeding device is used for conveying materials into the flash drying machine. According to the scheme, the organic solvent in the dried gas is condensed into a liquid state and collected, the organic solvent can be effectively recycled, waste of the organic solvent is avoided, the production cost is reduced, the whole recycling process is carried out in a closed structure, the possibility that the organic solvent volatilizes into the environment is reduced, environmental protection is facilitated, and the production cost is reduced. And meanwhile, the health and safety of operators are also guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of flash dryer technology, and more specifically, to a flash dryer system with a closed organic solvent recovery structure. Background Technology

[0002] In industrial production processes, many materials require drying, and flash dryers are a commonly used drying equipment. A flash dryer is a new type of continuous drying equipment that integrates drying, crushing, and screening. Its working principle is as follows: Hot air enters the annular gap at the bottom of the drying chamber tangentially through the inlet pipe and rises spirally. Simultaneously, the material is added into the tower by the feeder and undergoes thorough heat exchange with the hot air. Larger, wetter materials are mechanically crushed by the agitator, while materials with lower moisture content and smaller particle size rise with the rotating airflow and are conveyed to the separator for gas-solid separation.

[0003] Traditional flash dryers, when drying organic solvents, can only directly discharge or wash the waste gas after drying, wasting the value of the solvent. In addition, solvents have adverse effects on human health, and the production of equipment with flammable solvents poses an explosion risk, which can easily lead to serious accidents. Therefore, a flash dryer system with a closed organic solvent recovery structure is proposed. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a flash dryer system with a closed organic solvent recovery structure.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A flash dryer system with a closed organic solvent recovery structure includes a flash dryer, an induced draft fan, and an electrical cabinet. The bottom of the flash dryer is equipped with a stirring and pulverizing mechanism. The air inlet of the flash dryer is located on one side of the stirring and pulverizing mechanism. The air inlet of the flash dryer is connected to a heater through a pipeline. The heater heats the gas entering the flash dryer. The feed inlet of the flash dryer is connected to a feeding device through a pipeline. The feeding device is used to transport materials into the flash dryer.

[0007] The outlet of the flash dryer is connected to a hydrocyclone via a pipe. The outlet of the hydrocyclone is connected to a cyclone separator via a pipe. The output end of the cyclone separator is connected to a bag filter via a pipe. The bag filter is connected to a condensation system via a pipe. The outlet of the condensation system is connected to an induced draft fan. The outlet of the induced draft fan is connected to a heater via a pipe. A buffer tank is installed on one side of the condensation system for the recovery of condensate.

[0008] As a further description of the above technical solution: the stirring and pulverizing mechanism includes a stirrer rotatably mounted on the bottom wall of the flash dryer, and the bottom of the flash dryer is provided with a drive mechanism for driving the stirrer to rotate.

[0009] As a further description of the above technical solution: the feeding device includes a storage tank and a screw feeder. The storage tank is connected to the screw feeder through a pipe. The screw feeder is connected to the inlet of the flash dryer. A metering valve is installed on the discharge pipe of the storage tank.

[0010] As a further description of the above technical solution: the bottom of the cyclone separator is provided with a discharge pipe, and the discharge pipe is provided with a valve that can be controlled to open and close.

[0011] As a further description of the above technical solution: it also includes a detection device, which includes an oxygen content detection device, a pressure detection device, and a temperature detection device. The temperature detection device includes a temperature measuring seat installed at the air outlet of the heater, the flash dryer, and the condensation system.

[0012] As a further description of the above technical solution: an alarm is installed on the electrical cabinet.

[0013] Compared with existing technologies, the advantages of this utility model are:

[0014] I. This solution effectively recovers organic solvents by condensing and collecting them from the dried gas into a liquid state, thus avoiding waste and reducing production costs. The entire recovery process is carried out in a closed structure, which reduces the possibility of organic solvents volatilizing into the environment, which is beneficial to environmental protection and also ensures the health and safety of operators.

[0015] II. This solution employs a three-stage gas-solid separation device consisting of a hydrocyclone, a cyclone separator, and a bag filter. The hydrocyclone and cyclone separator utilize centrifugal force to separate larger particles, while the bag filter effectively intercepts smaller particles. This combination significantly improves the efficiency of gas-solid separation and reduces the solid particle content in the gas.

[0016] Third, in this scheme, the induced draft fan returns the gas, after being processed by the condensation system, to the heater, achieving heat recycling. This reduces the system's dependence on external heat sources, lowers energy consumption, and improves energy efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 For the present utility model Figure 1 Top view.

[0019] Explanation of the labels in the diagram:

[0020] 1. Flash dryer; 2. Exhaust fan; 3. Electrical cabinet; 4. Heater; 5. Feeding device; 51. Storage tank; 52. Screw feeder; 53. Metering valve; 6. Hydrocyclone; 7. Cyclone separator; 71. Valve; 8. Bag filter; 9. Condensation system; 10. Buffer tank; 11. Mixing and pulverizing mechanism; 111. Agitator; 112. Drive mechanism; 12. Detection device; 13. Alarm. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-2 A flash dryer system with a closed-loop organic solvent recovery structure includes a flash dryer 1, an induced draft fan 2, and an electrical cabinet 3. A stirring and pulverizing mechanism 11 is installed at the bottom of the flash dryer 1. The air inlet of the flash dryer 1 is located on one side of the stirring and pulverizing mechanism 11. A heater 4 is connected to the air inlet of the flash dryer 1 via a pipeline. The heater 4 heats the gas entering the flash dryer 1, and the heated gas provides heat for drying the material. A feeding device 5 is connected to the feed inlet of the flash dryer 1 via a pipeline, which conveys the material into the flash dryer 1. After the material enters the flash dryer 1, the stirring and pulverizing mechanism 11 stirs and pulverizes the material, ensuring full contact between the material and the hot gas, accelerating the evaporation of moisture and organic solvents in the material, thereby achieving drying.

[0023] A hydrocyclone 6 is connected to the outlet of the flash dryer 1 via a pipeline. The outlet of the hydrocyclone 6 is connected to a cyclone separator 7 via another pipeline. A discharge pipe is located at the bottom of the cyclone separator 7, and a controllable valve 71 is installed on the discharge pipe. The dried gas, carrying solid particles, enters the hydrocyclone 6 from the outlet of the flash dryer 1 through the pipeline. The hydrocyclone 6 utilizes centrifugal force to cause the solid particles in the gas to rotate. Heavier solid particles are thrown against the wall of the hydrocyclone 6, thus achieving initial separation of the gas from some of the solid particles. The gas exiting the outlet of the hydrocyclone 6 then enters the cyclone separator 7 through the pipeline. The cyclone separator 7 further uses centrifugal force to separate the solid particles from the gas, and the solid particles are output from the bottom of the cyclone separator 7.

[0024] The output end of the cyclone separator 7 is connected to a bag filter 8 via a pipeline. Gas, after preliminary purification by the cyclone separator 7, enters the bag filter 8 through the pipeline. The bag filter 8 contains many filter bags. When gas passes through the filter bags, fine solid particles such as dust are trapped on the surface of the filter bags, further purifying the gas and reducing the dust content in the discharged gas. The bag filter 8 is connected to a condensation system 9 via a pipeline. A buffer tank 10 is installed on one side of the condensation system 9 for condensate recovery. Gas purified by the bag filter 8 enters the condensation system 9 through the pipeline. In the condensation system 9, the gas is cooled, and the organic solvent changes from a gaseous state to a liquid state, achieving organic solvent recovery. The recovered organic solvent flows into the buffer tank 10 on one side of the condensation system 9 for storage. The air outlet of the condensing system 9 is connected to the induced draft fan 2, and the air outlet of the induced draft fan 2 is connected to the heater 4 through a pipeline. The induced draft fan 2 draws out the gas, and then the air outlet of the induced draft fan 2 sends the gas back to the heater 4 through the pipeline. In this way, the heat in the gas is reused, reducing heat waste and improving the energy efficiency of the entire system.

[0025] Specifically, the mixing and pulverizing mechanism 11 includes a stirrer 111 rotatably mounted on the bottom wall of the flash dryer 1, and a drive mechanism 112 for driving the stirrer 111 to rotate is provided at the bottom of the flash dryer 1. The drive mechanism 112 drives the stirrer 111 to rotate inside the flash dryer 1. The rotation of the stirrer 111 mixes and pulverizes the material entering the flash dryer 1. The mixing process makes the material more evenly distributed inside the flash dryer 1, ensuring that the material is in full contact with the hot gas and improving drying efficiency. At the same time, the pulverizing operation can crush larger particles into smaller particles, increase the surface area of ​​the material, and accelerate the evaporation of moisture and organic solvents in the material.

[0026] The feeding device 5 includes a storage tank 51 and a screw feeder 52. The storage tank 51 is connected to the screw feeder 52 via a pipe. The screw feeder 52 is connected to the inlet of the flash dryer 1. A metering valve 53 is installed on the outlet pipe of the storage tank 51. Material is first stored in the storage tank 51. When it is necessary to feed material into the flash dryer 1, the screw feeder 52 starts working. The screw feeder 52 uses its own screw structure to transport the material in the storage tank 51 through the pipe to the inlet of the flash dryer 1. The metering valve 53 is installed on the outlet pipe of the storage tank 51, which can accurately control the amount of material flowing out of the storage tank 51. Through precise control of the material flow rate, the feeding speed and feed rate can be reasonably adjusted according to the drying conditions and production needs within the flash dryer 1, ensuring the stable operation of the drying process.

[0027] The system also includes detection devices 12, which include an oxygen content detector, a pressure detector, and a temperature detector, all of which are explosion-proof probes. The oxygen content detector can monitor the oxygen content within the system in real time. The pressure detector can detect the pressure at different points within the system (such as the flash dryer 1, pipelines, etc.) to ensure the system operates within the normal pressure range and prevent equipment damage or poor drying due to excessively high or low pressure. In case of overpressure, the vent automatically releases air, and the system can only be fed after the oxygen content falls below the set value. The temperature detector includes temperature measuring bases installed at the air outlets of the heater 4, flash dryer 1, and condenser system 9 to accurately measure the temperature of these critical components.

[0028] In addition, the electrical cabinet 3 is equipped with alarms 13, including overpressure alarms and oxygen concentration alarms. When the oxygen content, pressure, or temperature detected by the detection device 12 exceeds the normal range, the alarm 13 on the electrical cabinet 3 will issue an alarm signal. Operators can take timely measures based on the alarm to adjust the system operating parameters and ensure the safe and stable operation of the system.

[0029] The working principle of the flash dryer system with a closed organic solvent recovery structure of this utility model is as follows:

[0030] Nitrogen gas, heated by heater 4 at a suitable jetting speed, enters the bottom of flash dryer 1 and tangentially into the mixing and pulverizing drying chamber. This generates strong shearing, blowing, and rotational forces on the material, causing it to be micronized through centrifugal force, shearing, collision, and friction, thus enhancing mass and heat transfer. At the bottom of flash dryer 1, larger, wetter particle clusters are mechanically broken up by agitator 111, while smaller particles with lower moisture content are carried upwards by the rotating airflow and further dried during this upward movement.

[0031] The dried gas, carrying solid particles, enters the hydrocyclone 6 through a pipeline from the outlet of the flash dryer 1. The hydrocyclone 6 utilizes centrifugal force to cause the solid particles in the gas to rotate, with heavier particles being thrown against the wall of the hydrocyclone 6, thus achieving initial separation of the gas from some of the solid particles. The gas exiting the outlet of the hydrocyclone 6 then enters the cyclone separator 7 through a pipeline. The cyclone separator 7 further uses centrifugal force to separate the solid particles from the gas. The solid particles are output from the bottom of the cyclone separator 7 and enter the bag filter 8 for further purification. The humid, hot gas containing solvents (toluene, ethanol, etc.) is then introduced into the condensation system 9. On the surface of the condensation system 9, the organic solvent is pre-cooled and liquefied, completing the solvent recovery. Nitrogen is then sent to the heater 4 by the induced draft fan 2, forming a closed-loop cycle.

[0032] The system includes oxygen content detection, pressure detection, and temperature detection devices. When the system pressure exceeds the set value, the vent will automatically release air. The system can only be fed after the oxygen content falls below the set value. The system is also equipped with overpressure alarms and oxygen concentration alarms (13), and records the operating status in real time. In case of equipment malfunction, operators can take timely measures based on the alarm to ensure production safety.

[0033] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A flash dryer system with a closed organic solvent recovery structure, comprising a flash dryer (1), an induced draft fan (2), and an electrical cabinet (3), characterized in that: The bottom of the flash dryer (1) is provided with a stirring and pulverizing mechanism (11). The air inlet of the flash dryer (1) is located on one side of the stirring and pulverizing mechanism (11). The air inlet of the flash dryer (1) is connected to a heater (4) through a pipeline. The heater (4) heats the gas entering the flash dryer (1). The feed inlet of the flash dryer (1) is connected to a feeding device (5) through a pipeline. The feeding device (5) is used to transport the material into the flash dryer (1). The outlet of the flash dryer (1) is connected to a hydrocyclone (6) via a pipe. The outlet of the hydrocyclone (6) is connected to a cyclone separator (7) via a pipe. The output end of the cyclone separator (7) is connected to a bag filter (8) via a pipe. The bag filter (8) is connected to a condensation system (9) via a pipe. The outlet of the condensation system (9) is connected to an induced draft fan (2). The outlet of the induced draft fan (2) is connected to a heater (4) via a pipe. A buffer tank (10) is provided on one side of the condensation system (9). The buffer tank (10) is used for the recovery of condensate.

2. The flash dryer system with a closed organic solvent recovery structure according to claim 1, characterized in that: The stirring and pulverizing mechanism (11) includes a stirrer (111) rotatably mounted on the bottom wall of the flash dryer (1), and the bottom of the flash dryer (1) is provided with a drive mechanism (112) for driving the stirrer (111) to rotate.

3. The flash dryer system with a closed organic solvent recovery structure according to claim 1, characterized in that: The feeding device (5) includes a storage tank (51) and a screw feeder (52). The storage tank (51) is connected to the screw feeder (52) through a pipe. The screw feeder (52) is connected to the feed inlet of the flash dryer (1). A metering valve (53) is provided on the discharge pipe of the storage tank (51).

4. The flash dryer system with a closed organic solvent recovery structure according to claim 1, characterized in that: The bottom of the cyclone separator (7) is provided with a discharge pipe, and the discharge pipe is provided with a valve (71) that can be controlled to open and close.

5. The flash dryer system with a closed organic solvent recovery structure according to claim 1, characterized in that: It also includes a detection device (12), which includes an oxygen content detection device, a pressure detection device and a temperature detection device. The temperature detection device includes a temperature measuring seat installed at the air outlet of the heater (4), the flash dryer (1) and the condensation system (9).

6. The flash dryer system with a closed organic solvent recovery structure according to claim 1, characterized in that: An alarm (13) is installed on the electrical cabinet (3).

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