Pressure spray drying tower

Abstract

The utility model provides a pressure spray drying tower. The pressure spray drying tower comprises a tower body, an air inlet mechanism, a liquid inlet mechanism and a powder return mechanism, the tower body comprises a feeding section, a drying section, a powder returning section and a discharging section; the feeding section, the drying section, the powder returning section and the material receiving bottom section are stacked from top to bottom; an air outlet of the air inlet mechanism and a liquid outlet of the liquid inlet mechanism are formed in the feeding section; an air inlet of the powder returning mechanism is communicated with the powder returning section, and a discharging opening of the powder returning mechanism is communicated with the feeding section. By arranging the powder returning section, airflow and particles are separated, the size and the number of the particles brought out by the airflow are reduced, meanwhile, after particles in the airflow are screened out, the particles are put into the feeding section again to be granulated, and the particle receiving proportion is increased.

Description

Technical Field

[0001] The utility model relates to the field of particle drying, and particularly relates to a pressure spray drying tower. Background Art

[0002] The drying tower is used in the chemical, pharmaceutical and food industries to spray and dry solutions, emulsions, suspensions or slurries into granular products.

[0003] The drying tower in the related technology is composed of a vertical cylindrical tower body with a hot air inlet and a feed atomizer, a drying section with a tail gas outlet and a conical tower bottom with a finished product outlet. Its tail gas will inevitably carry finished product particles, so it is necessary to set up a bag filter to filter the particles. After being used for a period of time, it is necessary to stop the machine to clean the bag filter and recycle the particles for granulation and drying again, which will greatly reduce the drying efficiency of the drying tower and the particle collection ratio of a single drying.

[0004] How to improve the particle collection ratio during drying is an urgent problem to be solved at present. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a pressure spray drying tower.

[0006] In order to solve the above technical problems, the utility model provides a pressure spray drying tower, comprising:

[0007] A tower body, an air inlet mechanism, a liquid inlet mechanism and a powder return mechanism;

[0008] The tower body includes a feed section, a drying section, a powder return section and a discharge section;

[0009] The feed section, the drying section, the powder return section and the collection bottom section are stacked from top to bottom;

[0010] The air outlet of the air inlet mechanism and the liquid outlet of the liquid inlet mechanism are arranged in the feed section;

[0011] The air inlet of the powder return mechanism is communicated with the powder return section, and the discharge outlet of the powder return mechanism is communicated with the feed section.

[0012] Further, the powder return section includes a conical section and an enlarged section;

[0013] The bottom surface of the conical section is fixedly connected to the enlarged section;

[0014] The discharge section is fixedly arranged on the top surface of the conical section;

[0015] The drying section is fixedly arranged at one end of the enlarged section away from the conical section.

[0016] Furthermore, the diameter of the enlarged section is greater than that of the drying section.

[0017] Furthermore, the air inlet of the powder return section is fixedly connected to the top surface of the enlarged section and is arranged outside the drying section.

[0018] Furthermore, the air inlet mechanism includes: a blower and an electric heater;

[0019] The air outlet of the blower is communicated with the air inlet of the feeding section;

[0020] The electric heater is arranged between the air inlet of the feeding section and the air outlet of the blower and is adapted to heat the air flow sent by the blower.

[0021] Furthermore, the air inlet mechanism further includes a first filter and a second filter;

[0022] The first filter is arranged at the air inlet of the blower;

[0023] The second filter is arranged at the air outlet of the blower.

[0024] Furthermore, the liquid inlet mechanism includes:

[0025] a liquid inlet pipe, a liquid filter, a high-pressure pump and a spray gun;

[0026] The liquid inlet pipe, the liquid filter, the high-pressure pump and the spray gun are communicated in sequence;

[0027] The spray gun is arranged in the feeding section.

[0028] Furthermore, a buffer tank is also arranged between the high-pressure pump and the spray gun.

[0029] Furthermore, the powder return mechanism includes: a cyclone separator, a bag filter and a induced draft fan;

[0030] The cyclone separator, the bag filter and the induced draft fan are communicated in sequence;

[0031] The air inlet of the cyclone separator is communicated with the powder return section;

[0032] The discharge section of the cyclone separator and the discharge section of the bag filter are both communicated with the feeding section.

[0033] Furthermore, the pressure spray drying tower further includes a fire extinguishing mechanism;

[0034] The fire extinguishing mechanism includes a fire extinguishing tank, a flame detector and a plurality of fire extinguishing nozzles;

[0035] A plurality of the fire extinguishing nozzles are arranged at intervals in the drying section and are all communicated with the fire extinguishing tank;

[0036] The flame detector is arranged on the drying section;

[0037] At least one explosion vent is provided on the side wall of the drying section.

[0038] The beneficial effect of the present utility model is that the present utility model provides a pressure spray drying tower, comprising: a tower body, an air inlet mechanism, a liquid inlet mechanism and a powder return mechanism; the tower body includes a feeding section, a drying section, a powder return section and a discharging section; the feeding section, the drying section, the powder return section and the material receiving bottom section are stacked from top to bottom; the air outlet of the air inlet mechanism and the liquid outlet of the liquid inlet mechanism are arranged in the feeding section; the air inlet of the powder return mechanism is communicated with the powder return section, and the discharging port of the powder return mechanism is communicated with the feeding section. By providing the powder return section, the air flow and the particles are separated, reducing the size and quantity of the particles carried out by the air flow. At the same time, after screening out the fine particles in the air flow, they are put into the feeding section again for granulation, improving the particle recovery ratio. Description of the Drawings

[0039] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0040] Figure 1 It is a schematic structural diagram of the pressure spray drying tower provided by the embodiment of the present utility model.

[0041] In the figure: 100, tower body; 110, feeding section; 120, drying section; 130, powder return section; 131, conical section; 132, enlarged section; 140, discharging section; 200, air inlet mechanism; 210, blower; 220, electric heater; 230, first filter; 240, second filter; 300, liquid inlet mechanism; 310, liquid inlet pipe; 320, liquid filter; 330, high-pressure pump; 340, spray gun; 350, buffer tank; 400, powder return mechanism; 410, cyclone separator; 420, bag filter; 430, induced draft fan; 500, fire extinguishing mechanism; 510, fire extinguishing tank; 520, flame detector; 530, fire extinguishing nozzle; 540, explosion vent. Detailed Embodiments

[0042] The present utility model will now be further described in detail with reference to the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0043] Embodiment, please refer to Figure 1, this embodiment provides a pressure spray drying tower, comprising: a tower body 100, an air inlet mechanism 200, a liquid inlet mechanism 300 and a powder return mechanism 400; the tower body 100 includes a feeding section 110, a drying section 120, a powder return section 130 and a discharging section 140; the feeding section, the drying section 120, the powder return section 130 and the bottom receiving section are stacked from top to bottom; the air outlet of the air inlet mechanism 200 and the liquid outlet of the liquid inlet mechanism 300 are arranged in the feeding section 110; the air inlet of the powder return mechanism 400 is communicated with the powder return section 130, and the discharging outlet of the powder return mechanism 400 is communicated with the feeding section 110. By arranging the powder return section 130, the gas flow is separated from the particles, reducing the size and quantity of the particles carried out by the gas flow. At the same time, after screening out the fine particles in the gas flow, they are put into the feeding section 110 again for granulation, improving the particle collection ratio.

[0044] Wherein, the powder return section 130 includes a conical section 131 and an enlarged section 132; the bottom surface of the conical section 131 is fixedly connected to the enlarged section 132; the discharging section is fixedly arranged on the top surface of the conical section 131; the drying section 120 is fixedly arranged at one end of the enlarged section 132 away from the conical section 131.

[0045] It should be noted that the diameter of the enlarged section 132 is larger than that of the drying section 120. When the gas flow enters the enlarged section 132 of the powder return section 130, the flow rate slows down, and the particles fall to the discharging section 140 for collection, completing the primary separation. After the fine particles follow the gas flow into the powder return mechanism 400 for secondary separation, they return to the feeding section 110 for re-granulation. By increasing the diameter of the enlarged section 132, the number of particles entering the powder return mechanism 400 is reduced, and at the same time, the particles with qualified size are prevented from entering the powder return mechanism 400.

[0046] In this embodiment, the air inlet of the powder return section 130 is fixedly connected to the top surface of the enlarged section 132 and is arranged outside the drying section 120. The gas of the powder return section 130 is discharged from the top surface of the enlarged section 132, and the gas flow is in a U shape. The gas flow direction is as Figure 1 shown by F1 in, extending the time for the gas flow to pass through the powder return section 130 and further improving the separation effect of the particles from the gas flow.

[0047] In this embodiment, the air inlet mechanism 200 includes: a blower 210 and an electric heater 220; the air outlet of the blower 210 is communicated with the air inlet of the feeding section 110; the electric heater 220 is arranged between the air inlet of the feeding section 110 and the air outlet of the blower 210 and is adapted to heat the gas flow sent by the blower 210. By heating the gas flow of the blower 210, the liquid spray in the feeding section 110 is dried.

[0048] In order to ensure the cleanliness of the air flow of the blower 210, in this embodiment, the air inlet mechanism 200 further includes a first filter 230 and a second filter 240; the first filter 230 is disposed at the air inlet of the blower 210; the second filter 240 is disposed at the air outlet of the blower 210. By providing two-stage filtration, the air inlet and outlet of the blower 210 are filtered respectively to ensure the cleanliness of the air flow and avoid the influence of impurities in the air on the particles.

[0049] In this embodiment, the powder return mechanism 400 includes: a cyclone separator 410, a bag filter 420, and an induced draft fan 430; the cyclone separator 410, the bag filter 420, and the induced draft fan 430 are connected in sequence; the air inlet of the cyclone separator 410 is connected to the powder return section 130; the discharge sections of the cyclone separator 410 and the bag filter 420 are both connected to the feed section 110. By providing two-stage separation in the powder return mechanism 400, the filtration volume of the bag filter 420 is reduced, thereby reducing the cleaning frequency of the bag.

[0050] In this embodiment, the liquid inlet mechanism 300 includes: a liquid inlet pipe 310, a liquid filter 320, a high-pressure pump 330, and a spray gun 340; the liquid inlet pipe 310, the liquid filter 320, the high-pressure pump 330, and the spray gun 340 are connected in sequence; the spray gun 340 is disposed in the feed section 110. Specifically, through the liquid filter 320, the materials that are not dissolved in the liquid are filtered to avoid clogging of the spray gun 340. By providing the high-pressure pump 330, the liquid is pressurized so that the liquid ejected from the spray gun 340 is in a mist state.

[0051] In order to ensure a constant liquid pressure entering the spray gun 340, in this embodiment, a buffer tank 350 is further disposed between the high-pressure pump 330 and the spray gun 340.

[0052] Meanwhile, in order to monitor the liquid pressure of the liquid inlet mechanism 300, in this embodiment, a pressure gauge or a pressure sensor is disposed at the liquid outlet of the high-pressure pump 330.

[0053] In this embodiment, in order to prevent the tower body 100 from catching fire during drying, the pressure spray drying tower further includes a fire extinguishing mechanism 500; the fire extinguishing mechanism 500 includes a fire extinguishing tank 510, a flame detector 520, and a plurality of fire extinguishing nozzles 530; the plurality of fire extinguishing nozzles 530 are arranged at intervals in the drying section 120 and are all communicated with the fire extinguishing tank 510; the flame detector 520 is arranged on the drying section 120; at least one explosion vent 540 is formed in the side wall of the drying section 120. The flame detector 520 detects the flame. When a flame is detected, the fire extinguishing tank 510 is opened, and the plurality of fire extinguishing nozzles 530 extinguish the fire simultaneously. Meanwhile, the explosion vent 540 is provided to relieve pressure and prevent the pressure inside the tower body 100 from being too high.

[0054] In summary, the present utility model provides a pressure spray drying tower, including: a tower body 100, an air inlet mechanism 200, a liquid inlet mechanism 300, and a powder return mechanism 400; the tower body 100 includes a feeding section 110, a drying section 120, a powder return section 130, and a discharging section 140; the feeding section, the drying section 120, the powder return section 130, and the receiving bottom section are stacked from top to bottom; the air outlet of the air inlet mechanism 200 and the liquid outlet of the liquid inlet mechanism 300 are arranged in the feeding section 110; the air inlet of the powder return mechanism 400 is communicated with the powder return section 130, and the discharging outlet of the powder return mechanism 400 is communicated with the feeding section 110. By providing the powder return section 130, the air flow is separated from the particles, reducing the size and quantity of the particles carried out by the air flow. At the same time, after screening out the fine particles in the air flow, they are put into the feeding section 110 again for granulation, improving the particle collection ratio.

[0055] All the components selected in this application (components without specific structures described) are common standard components or components known to those skilled in the art. Their structures and principles can be known by those skilled in the art through technical manuals or by conventional experimental methods. Moreover, the software programs involved in this application are all prior arts, and this application does not involve any improvement to the software programs.

[0056] In the description of the embodiments of the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0057] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0058] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some communication interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical, mechanical, or other form.

[0059] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place, or they can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0060] In addition, in each embodiment of the present utility model, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0061] Based on the above inspiration from the ideal embodiment of the present utility model, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A pressure spray drying tower, characterized in that, Comprising: a tower body, an air inlet mechanism, a liquid inlet mechanism and a powder return mechanism; the tower body includes a feeding section, a drying section, a powder return section and a discharging section; the feeding section, the drying section, the powder return section and the material receiving bottom section are stacked from top to bottom; the air outlet of the air inlet mechanism and the liquid outlet of the liquid inlet mechanism are arranged in the feeding section; the air inlet of the powder return mechanism is communicated with the powder return section, and the discharging outlet of the powder return mechanism is communicated with the feeding section.

2. The pressure spray drying tower according to claim 1, wherein the powder return section includes a conical section and an enlarged section; the bottom surface of the conical section is fixedly connected to the enlarged section; the discharging section is fixedly arranged on the top surface of the conical section; the drying section is fixedly arranged at one end of the enlarged section away from the conical section.

3. The pressure spray drying tower according to claim 2, wherein the diameter of the enlarged section is larger than the diameter of the drying section.

4. The pressure spray drying tower according to claim 3, wherein the air inlet of the powder return section is fixedly connected to the top surface of the enlarged section and is arranged outside the drying section.

5. The pressure spray drying tower according to claim 1, wherein the air inlet mechanism includes: a blower and an electric heater; the air outlet of the blower is communicated with the air inlet of the feeding section; the electric heater is arranged between the air inlet of the feeding section and the air outlet of the blower and is adapted to heat the air flow sent by the blower.

6. The pressure spray drying tower according to claim 5, wherein the air inlet mechanism further includes a first filter and a second filter; the first filter is arranged at the air inlet of the blower; the second filter is arranged at the air outlet of the blower.

7. The pressure spray drying tower according to claim 1, wherein the liquid inlet mechanism includes: a liquid inlet pipe, a liquid filter, a high-pressure pump and a spray gun; the liquid inlet pipe, the liquid filter, the high-pressure pump and the spray gun are sequentially communicated; the spray gun is arranged in the feeding section.

8. The pressure spray drying tower according to claim 7, wherein a buffer tank is further arranged between the high-pressure pump and the spray gun.

9. The pressure spray drying tower according to claim 1, wherein the powder return mechanism includes: a cyclone separator, a bag filter and a induced draft fan; the cyclone separator, the bag filter and the induced draft fan are sequentially communicated; the air inlet of the cyclone separator is communicated with the powder return section; the discharging sections of the cyclone separator and the bag filter are both communicated with the feeding section.

10. The pressure spray drying tower according to claim 1, wherein the pressure spray drying tower further includes a fire extinguishing mechanism; the fire extinguishing mechanism includes a fire extinguishing tank, a flame detector and a plurality of fire extinguishing nozzles; the plurality of fire extinguishing nozzles are arranged at intervals in the drying section and are all communicated with the fire extinguishing tank; the flame detector is arranged on the drying section; at least one explosion vent is opened on the side wall of the drying section.

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