Single-package spray drying system

Abstract

The utility model discloses a single-package spray drying system which comprises a feeding unit, a spray drying unit, a hot air unit, a fluidized bed unit, a material recycling unit, a material collecting unit and a tail gas recycling unit, and the discharging end of the feeding unit is communicated with the feeding end at the top end of the spray drying unit; an air outlet of the hot air unit communicates with an air inlet in the top end of the spray drying unit; the fluidized bed unit is cooperatively arranged at the bottom end of the spray drying unit; a gas inlet of the material recycling unit is communicated with a tail gas outlet of the spray drying unit, and a discharging end is respectively communicated with a feeding end at the top end of the spray drying unit and a feeding end of the material collecting unit; a gas inlet of the tail gas treatment unit is communicated with a gas outlet of the material recovery unit; the feeding end of the material collecting unit communicates with the discharging end of the spray drying unit. On one hand, the fluidized bed unit is arranged in the spray drying unit, the drying efficiency can be further improved, on the other hand, multi-category recycling of materials is achieved through the material collecting unit, the utilization rate of the materials is increased, and various drying requirements are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of spray drying, in particular to a single-bag spray drying system. Background Art

[0002] The single-bag spray drying system is a drying method that disperses the raw material liquid such as solution, emulsion, suspension or melt into droplets through an atomizer, and directly contacts with hot air (or other gases) for heat exchange, thereby obtaining a powdery or granular product.

[0003] However, the drying efficiency of conventional single-pack spray drying systems is affected by many factors, such as the airflow distribution in the drying chamber and the contact time between the droplets and the hot air. Generally speaking, their drying efficiency may be relatively low, which to some extent limits their scope of application. Utility Model Content

[0004] In order to solve the above technical problems, the utility model discloses a single-bag spray drying system. On the one hand, by setting a fluidized bed unit in the spray drying unit, the drying efficiency can be further improved. On the other hand, by setting a material collection unit, multi-category recovery of materials can be achieved, thereby improving the utilization rate of materials and meeting various drying needs.

[0005] The specific technical solutions of the utility model are as follows:

[0006] A single-package spray drying system includes a feeding unit, a spray drying unit, a hot air unit, a fluidized bed unit, a material recovery unit, a material collection unit and an exhaust gas recovery unit, wherein:

[0007] The discharge end of the feeding unit is connected to the feeding end at the top of the spray drying unit, and is used to feed the material into the spray drying unit for drying;

[0008] The air outlet of the hot air unit is connected to the air inlet at the top of the spray drying unit, so as to send hot air into the spray drying unit to dry the material;

[0009] The fluidized bed unit is arranged at the bottom of the spray drying unit and is used to dry the material so that the material remains in a floating state;

[0010] The air inlet of the material recovery unit is connected to the tail gas outlet of the spray drying unit, and is used to collect and recover materials in the tail gas. The discharge end of the material recovery unit is respectively connected to the feed end at the top of the spray drying unit and the feed end of the material collection unit;

[0011] The air inlet of the tail gas recovery unit is connected to the air outlet of the material recovery unit for collecting and treating the tail gas;

[0012] The feed end of the material collecting unit is communicated with the discharge end of the spray drying unit and is used for collecting and processing the dried material.

[0013] Preferably, the method further comprises a flow aid unit, which is installed between the material collecting unit and the spray drying unit and is used to feed the flow aid into the material collecting unit to promote the fluidity of the dried material.

[0014] Preferably, the hot air unit includes an air filter I, a blower I, a steam heat exchanger I, an electric heater, and an air filter II connected in sequence, wherein the external air is filtered by the air filter I and then sent by the blower I into the steam heat exchanger I and the electric heater in sequence for heat exchange and heating to form hot air, and finally enters the spray drying unit through the air filter II to dry the material.

[0015] Preferably, the spray drying unit includes a drying tower, an atomizer and a vibrating air hammer device, wherein the atomizer is installed at the feed end at the top of the drying tower, and the feed port of the atomizer is connected to the discharge end I of the feed unit, the air inlet at the top of the drying tower is connected to the air outlet of the hot air unit, and the tail gas outlet of the drying tower is connected to the material recovery unit; the vibrating air hammer device is installed in the cone part of the drying tower and is connected to the external compressed air.

[0016] Preferably, the fluidized bed unit includes an air supply unit I and a built-in fluidized bed, the built-in fluidized bed is arranged at the bottom of the drying tower in the spray drying unit, and the air supply unit I is installed at the bottom of the spray drying unit and is connected to the air inlet at the bottom of the spray drying unit to provide high-temperature airflow for the built-in fluidized bed.

[0017] Preferably, the material recovery unit includes an air supply unit II, a multi-stage cyclone dust collector, a diversion pipe, and a feeding pipe. The air outlet of the air supply unit II is connected to the air inlet of the feeding pipe. The feeding pipe is connected to the bottom discharge end of the multi-stage cyclone dust collector in turn and then to the feed end of the diversion pipe. The diversion pipe is divided into two branches, the discharge end I of one branch is connected to the feed end at the top of the spray drying unit, and the discharge end II of the other branch is connected to the feed end of the material collection unit.

[0018] Preferably, the material collection unit includes an air blower II, a vibrating screen, a vacuum loader and a material bin, wherein the feed end of the vibrating screen is respectively connected to the discharge ends of the spray drying unit, the flow aid unit and the material recovery unit, the air blower II is connected to the air inlet of the vibrating screen to provide material cooling air, and the vacuum loader is connected to the discharge end of the vibrating screen to transport the material to the material bin.

[0019] Beneficial effects: The utility model discloses a single-bag spray drying system, which has the following advantages compared with the existing technology:

[0020] (1) In the present invention, a fluidized bed unit is provided in the spray drying unit to further fully contact the spray-dried material particles with the high-temperature airflow, which not only ensures uniform heat transfer and avoids local overheating or uneven drying problems, but also the high-temperature air enables the material to reach the drying requirements in a short time, thereby improving production efficiency.

[0021] (2) In the present invention, by providing a material recovery unit with a diversion pipe, materials can be recovered according to drying requirements, thereby improving the utilization rate of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall system structure of this embodiment 1.

[0023] In the figure: feeding unit 1, feeding pump 1-1, spray drying unit 2, drying tower 2-1, atomizer 2-2, vibrating air hammer device 2-3, explosion venting device 2-4, air pressure monitoring device 2-5, hot air unit 3, air filter I 3-1, blower I 3-2, steam heat exchanger I 3-3, electric heater 3-4, air filter II 3-5, hot air temperature monitor 3-6, fluidized bed unit 4, air supply unit I 4-1, coarse and medium efficiency filters 4-11, surface cooling dehumidifier II 4-12, blower III 4-13, steam heat exchanger Ⅱ4-14, high-efficiency filter 4-15, built-in fluidized bed 4-2, material recovery unit 5, air supply unit Ⅱ5-1, first-stage cyclone dust collector 5-2, second-stage cyclone dust collector 5-3, diversion pipe 5-4, feeding pipe 5-5, material collection unit 6, air supply fan Ⅱ6-1, vibrating screen 6-2, vacuum loader 6-3, material bin 6-4, tail gas recovery unit 7, water film dust collector 7-1, flow aid unit 8, surface cooling dehumidifier Ⅰ8-1, steam heater 8-2, high-efficiency filter Ⅰ8-3, flow aid feeder 8-4. DETAILED DESCRIPTION

[0024] The following are some improvements and modifications to the present invention in conjunction with the accompanying drawings, and these improvements and modifications should also be considered as within the scope of protection of the present invention. Example 1

[0025] like Figure 1As shown, a single-bag spray drying system includes a feeding unit 1, a spray drying unit 2, a hot air unit 3, a fluidized bed unit 4, a material recovery unit 5, a material collection unit 6 and an exhaust gas recovery unit 7, wherein the discharge end of the feeding unit 1 is connected to the feeding end at the top of the spray drying unit 2, for feeding the material into the spray drying unit 2 for drying; the air outlet of the hot air unit 3 is connected to the air inlet at the top of the spray drying unit 2, for feeding hot air into the spray drying unit 2 to dry the material; the fluidized bed unit 4 is arranged at the bottom of the spray drying unit 2, for drying the material and keeping the material in a floating state;

[0026] The air inlet of the material recovery unit 5 is connected to the tail gas outlet of the spray drying unit 2, and is used to collect and recover the material in the tail gas. The discharge end of the material recovery unit 5 is respectively connected to the feed end at the top of the spray drying unit 2 and the feed end of the material collecting unit 6; the air inlet of the tail gas recovery unit 7 is connected to the air outlet of the material recovery unit 5, and is used to collect and treat the tail gas; the feed end of the material collecting unit 6 is connected to the discharge end of the spray drying unit 2, and is used to collect and treat the dried material; the flow aid unit 8, the flow aid unit 8 is installed between the material collecting unit 6 and the spray drying unit 2, and is used to feed the flow aid into the material collecting unit 6 to promote the fluidity of the dried material.

[0027] In this embodiment 1, hot air unit 3 includes an air filter I 3-1, a blower I 3-2, a steam heat exchanger I 3-3, an electric heater 3-4, and an air filter II 3-5, which are connected in sequence. External air is filtered by air filter I 3-2 and then fed by blower I 3-2 into steam heat exchanger I 3-2 and electric heater 3-4 for heat exchange and heating to form hot air. Finally, hot air passes through air filter II 3-5 and enters spray drying unit 2 to dry the material. In this embodiment 1, to further effectively control the temperature of the hot air in the drying tower, a hot air temperature monitor 3-6 is also provided in hot air unit 3 for real-time monitoring of the hot air temperature in the drying tower, thereby improving the safety and reliability of equipment operation.

[0028] In this embodiment 1, the spray drying unit 2 includes a drying tower 2-1, an atomizer 2-2 and a vibrating air hammer device 2-3, wherein the atomizer 2-2 is installed at the feed end of the top of the drying tower 2-1, and the feed port of the atomizer 2-2 is connected to the discharge end of the feed unit 1; the air inlet at the top of the drying tower 2-1 is connected to the air outlet of the hot air unit 3, the tail gas outlet of the drying tower 2-1 is connected to the material recovery unit 5, and the vibrating air hammer device 2-3 is installed in the cone part of the drying tower 2-1 and is connected to the external compressed air.

[0029] In order to further improve the safety of the spray drying system, an explosion relief device 2-4 can be installed at the top of the drying tower 2-1, and an air pressure monitoring device 2-5 can be installed in the drying tower 2-1 to monitor the air pressure in the tower in real time. When necessary, the explosion relief device 2-4 can be used to release the pressure in the tower to prevent dust explosion accidents.

[0030] In Example 1, the vibrating air hammer devices 2-3 are installed in the conical portion of the drying tower. This utilizes aerodynamic principles to adjust the force of the strikes by adjusting the air supply pressure, thereby striking the outer wall of the equipment without causing deformation. This effectively prevents adhesion, blockage, and bridging of materials caused by static electricity, moisture, or other factors during the drying process, ensuring smooth material flow and transportation.

[0031] In this embodiment 1, the fluidized bed unit 4 includes an air supply unit I4-1 and a built-in fluidized bed 4-2. The built-in fluidized bed 4-2 is arranged at the bottom of the drying tower 2-1 in the spray drying unit 2, and the air supply unit I4-1 is installed at the bottom of the spray drying unit 2 and is connected to the air inlet at the bottom of the spray drying unit 2 to provide high-temperature airflow for the built-in fluidized bed.

[0032] In this utility model, the internal fluidized bed 4-2 utilizes vibration to suspend the material particles in the airflow, creating a fluidized state. In this state, the hot air can more effectively transfer heat to the material particles, ensuring uniform heat transfer and improving heat transfer efficiency. This not only helps shorten drying time but also ensures consistent quality of the dried material.

[0033] In this embodiment 1, the material recovery unit 5 includes an air supply unit II 5-1, a primary cyclone dust collector 5-2, a secondary cyclone dust collector 5-3, a diversion pipe 5-4, and a feed pipe 5-5. The air outlet of the air supply unit II 5-1 is connected to the air inlet of the feed pipe 5-5. The feed pipe 5-5 is connected to the bottom discharge ends of the secondary cyclone dust collector 5-3 and the primary cyclone dust collector 5-2 in sequence, and then connected to the feed end of the diversion pipe 5-4. The diversion pipe 5-4 is divided into two branches. The discharge end I of one branch is connected to the feed end at the top of the spray drying unit 2, and the discharge end II of the other branch is connected to the feed end of the material collection unit 6. In the present utility model, the number of stages of the multi-stage cyclone dust collector can be set by those skilled in the art according to actual needs. In this embodiment 1, two stages are preferred.

[0034] In this embodiment 1, the material collection unit 6 includes an air blower II 6-1, a vibrating screen 6-2, a vacuum loader 6-3 and a material bin 6-4, wherein the feed end of the vibrating screen 6-2 is respectively connected to the discharge ends of the spray drying unit 2, the flow aid unit 8 and the material recovery unit 5, the air blower II 6-1 is connected to the air inlet of the vibrating screen 6-2, and is used to provide material cooling air, and the vacuum loader 6-3 is connected to the discharge end of the vibrating screen 6-2, and is used to transport the material to the material bin 6-4.

[0035] In this embodiment 1, the flow aid unit 8 includes a surface cooling dehumidifier I8-1, a steam heater 8-2, a high-efficiency filter I8-3 and a flow aid feeder 8-4 which are connected in sequence. The normal temperature air passes through the surface cooling dehumidifier I8-1, the steam heater 8-2, the high-efficiency filter I8-3 and then is fed into the vibrating screen 6-2 of the material collecting unit 6 through the flow aid feeder 8-4.

[0036] In the present invention, the structures of air supply unit I 4-1 and air supply unit II 5-1 can be customized based on actual needs, and any existing device capable of delivering hot air is suitable. In Example 1, air supply unit I 4-1 and air supply unit II 5-1 have the same structure, each including a coarse and medium efficiency filter 4-11, a surface cooling dehumidifier II 4-12, air supply unit III 4-13, a steam heat exchanger II 4-14, and a high efficiency filter 4-15, all connected in sequence. Normal temperature air is filtered, dehumidified, heated, and then filtered again by air supply unit III 4-13 before entering the next unit.

[0037] In this embodiment 1, the tail gas recovery unit 7 can use a water film dust collector 7-1 to remove dust from the tail gas before discharging. The tail gas in this embodiment 1 includes not only the tail gas discharged by the spray drying unit 2, but also the tail gas from all vacuum feeders and material cooling.

[0038] In this embodiment 1, the feeding unit 1 can use the feeding pump 1-1 to add the mother liquor into the spray drying unit 2, which is a conventional technical means and is not described in detail.

[0039] The working principle of this utility model is as follows:

[0040] Feed unit 1 feeds the mother liquor into the atomizer 2-2 of spray drying unit 2 via feed pump 1-1. After atomization, the liquid enters drying tower 2-1. At this point, air undergoes primary filtration, steam heat exchange, electric heating, and secondary filtration in hot air unit 3 before being delivered to drying tower 2-1 at a predetermined temperature by blower I 3-2. This air then fully contacts and dries the atomized material. The dried material enters the internal fluidized bed of drying tower 2-1, where it is further dried by hot air supplied by blower I 4-1 of fluidized bed unit 4. The fluidized bed dried material enters material collection unit 6, where blower II 6-1 delivers cooling air to cool the dried material, vibrate and screen it, and then uses a vacuum loader 6-3 to deliver the dried and cooled material to material silo 6-4 for storage. During the material collection process, the flow aid unit 8 uses the air after steam heat exchange to feed the flow aid in the flow aid feeder 8 - 4 and the dried material into the material collection unit 6 .

[0041] At the same time, the exhaust gas from drying tower 2-1 is discharged into material recovery unit 5. After rotation and centrifugal separation in primary cyclone 5-2 and secondary cyclone 5-3, the fine powder in the exhaust gas is thrown toward the walls of the device under the action of centrifugal force and settles to the bottom along the walls. The remaining exhaust gas is passed into water film dust collector 7-1 in exhaust gas recovery unit 7 before being discharged. The fine powder accumulated at the bottom of primary cyclone 5-2 and secondary cyclone 5-3 can be passed to drying tower 2-1 or material collection unit 6 by air supply unit II 5-1 according to actual drying needs. For example, when making granules, the fine powder can be returned to the top of drying tower 2-1 for granulation. When making fine powder, the fine powder can be returned to vibrating screen 6-2 in material collection unit 6.

[0042] The above is only an explanation of the present invention and is a preferred embodiment of the present invention. It should be noted that those skilled in the art may make several improvements and modifications without departing from the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A single-package spray drying system, characterized in that: It includes a feeding unit, a spray drying unit, a hot air unit, a fluidized bed unit, a material recovery unit, a material collection unit and an exhaust gas recovery unit, wherein: The discharge end of the feeding unit is connected to the feeding end at the top of the spray drying unit, and is used to feed the material into the spray drying unit for drying; The air outlet of the hot air unit is connected to the air inlet at the top of the spray drying unit, so as to send hot air into the spray drying unit to dry the material; The fluidized bed unit is arranged at the bottom of the spray drying unit and is used to dry the material so that the material remains in a floating state; The air inlet of the material recovery unit is connected to the tail gas outlet of the spray drying unit, and is used to collect and recover materials in the tail gas. The discharge end of the material recovery unit is respectively connected to the feed end at the top of the spray drying unit and the feed end of the material collection unit; The air inlet of the tail gas recovery unit is connected to the air outlet of the material recovery unit for collecting and treating the tail gas; The feed end of the material collecting unit is communicated with the discharge end of the spray drying unit and is used for collecting and processing the dried material.

2. The single-package spray drying system according to claim 1, characterized in that The system further comprises a flow aid unit, which is installed between the material collecting unit and the spray drying unit and is used to deliver the flow aid into the material collecting unit to promote the fluidity of the dried material.

3. The single-package spray drying system according to claim 1, characterized in that The hot air unit includes an air filter I, a blower I, a steam heat exchanger I, an electric heater, and an air filter II connected in sequence. The external air is filtered by the air filter I and then sent by the blower I into the steam heat exchanger I and the electric heater in sequence for heat exchange and heating to form hot air, and finally enters the spray drying unit through the air filter II to dry the material.

4. The single-package spray drying system according to claim 1, characterized in that The spray drying unit includes a drying tower, an atomizer and a vibrating air hammer device, wherein the atomizer is installed at the feed end at the top of the drying tower, and the feed port of the atomizer is connected to the discharge end I of the feed unit, the air inlet at the top of the drying tower is connected to the air outlet of the hot air unit, and the tail gas outlet of the drying tower is connected to the material recovery unit; the vibrating air hammer device is installed in the cone part of the drying tower and is connected to the external compressed air.

5. The single-package spray drying system according to claim 1, characterized in that The fluidized bed unit includes an air supply unit I and a built-in fluidized bed. The built-in fluidized bed is arranged at the bottom of the drying tower in the spray drying unit, and the air supply unit I is installed at the bottom of the spray drying unit and is connected to the air inlet at the bottom of the spray drying unit to provide high-temperature airflow for the built-in fluidized bed.

6. The single-package spray drying system according to claim 1, characterized in that The material recovery unit includes an air supply unit II, a multi-stage cyclone dust collector, a diversion pipe, and a feeding pipe. The air outlet of the air supply unit II is connected to the air inlet of the feeding pipe. The feeding pipe is connected to the bottom discharge end of the multi-stage cyclone dust collector in sequence and then to the feed end of the diversion pipe. The diversion pipe is divided into two branches. The discharge end I of one branch is connected to the feed end at the top of the spray drying unit, and the discharge end II of the other branch is connected to the feed end of the material collection unit.

7. The single-package spray drying system according to claim 2, characterized in that The material collection unit includes an air blower II, a vibrating screen, a vacuum loader and a material bin, wherein the feed end of the vibrating screen is respectively connected to the discharge ends of the spray drying unit, the flow aid unit and the material recovery unit, the air blower II is connected to the air inlet of the vibrating screen to provide material cooling air, and the vacuum loader is connected to the discharge end of the vibrating screen to transport the material to the material bin.

Images