Spray drying equipment for protein powder production

Abstract

The invention belongs to the technical field of spray drying, particularly relates to spray drying equipment for protein powder production, and provides the following scheme that the spray drying equipment specifically comprises an equipment support, a cloth bag dust removal separator, a spiral separator, a door-shaped frame, an air blower and a high-pressure conveying pump are sequentially installed at the top of the equipment support, and a drying cylinder is installed in the door-shaped frame; and a hot air dispersing mechanism is rotationally mounted at the top of the drying cylinder, a spraying mechanism is fixedly mounted at the top of the door-shaped frame, and the spraying mechanism is rotationally connected with the hot air dispersing mechanism. Protein powder enters the discharging pipe, the dredging mechanism connected with hot air is arranged at one end of the discharging pipe, the protein powder in the pipeline is stirred up, air flow is heated and subjected to heat preservation again, the air circulation speed is increased, the phenomena of caking and wall hanging of the protein powder in the discharging pipe are effectively avoided, and the working efficiency is improved. And the protein conveying stability is maintained.

Description

Technical Field

[0001] The invention relates to the technical field of spray drying, in particular to a spray drying device for producing protein powder. Background Art

[0002] Spray drying is a method of applying systematic technology to material drying. Through mechanical action, the material to be dried is dispersed into very fine mist-like particles. After the thin material is atomized in the drying chamber, most of the water is removed instantly during contact with hot air (increasing the water evaporation area and accelerating the drying process), so that the solid matter in the material is dried into powder, and the water is quickly vaporized to obtain a dry product. This method can directly dry solutions and emulsions into powder or granular products, eliminating the evaporation, crushing and other processes.

[0003] Protein powder can enhance the body's immunity, repair damaged body tissues, and restore the body to health as soon as possible. With the continuous development of the economy, more and more researchers are gradually improving their research on protein powder. As a nutrient supplement, protein powder will destroy its nutritional components during the production process at high temperatures. Therefore, during the processing stage, spray drying is used to continuously spray, mix and dry the substance from liquid to powder. The temperature used is not very high, so while removing microbial contamination, the taste, color and nutrition of the protein powder can still be effectively retained. However, when the current spray drying equipment for protein powder production is in use, when the protein is unloaded from the drying equipment, the space where the protein is located is compressed, and the heat is dissipated. Part of the protein is not transported in time, resulting in agglomeration and wall hanging.

[0004] In view of this, the present invention provides a spray drying device for protein powder production to solve the technical problems existing in the above-mentioned prior art. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a spray drying device for producing protein powder.

[0006] The present invention provides a spray drying device for protein powder production, comprising an equipment support, wherein a bag dust separator, a spiral separator, a door frame, a blower and a high-pressure delivery pump are sequentially installed on the top of the equipment support, a drying cylinder is installed inside the door frame, and a hot air dispersion mechanism is rotatably installed on the top of the drying cylinder, a spray mechanism is fixedly installed on the top of the door frame, and the spray mechanism is rotatably connected to the hot air dispersion mechanism, an annular cavity rotatably matched with the hot air dispersion mechanism is provided on the top of the drying cylinder, a heater is installed between the blower and the annular cavity through a pipeline, the outlet of the high-pressure delivery pump is connected to the spray mechanism through a pipeline, and the outlet of the drying cylinder is connected to the spray mechanism through a pipeline. A laterally distributed discharge pipe is installed at the bottom, and the outlet end of the discharge pipe is connected to the spiral separator through a pipe, and the outlet of the spiral separator is connected to the bag-type dust collector through a pipe, and a three-way solenoid valve is installed at the exhaust end of the bag-type dust collector, and an insulation cover is provided on the outer side of the drying cylinder, and the air inlet end of the insulation cover is connected to one of the outlets of the three-way solenoid valve through a pipe, and a dredging mechanism is installed at the other end of the discharge pipe, and one end of the dredging mechanism is connected to the air outlet of the heater through a pipe, and a heating rod extending to the inside of the drying cylinder is installed in the middle of the discharge pipe, and a main driving motor for driving the hot air dispersion mechanism to rotate is installed inside the door frame.

[0007] Preferably in the present invention, the hot air dispersion mechanism includes an annular tube body, and the outer side surface of the annular tube body is provided with a plurality of arc grooves connected to the annular cavity, the bottom end of the annular tube body is a trumpet-shaped structure, and the inner wall of the annular tube body is provided with a plurality of jet portions protruding toward the center of the circle.

[0008] Preferably in the present invention, the bottom end of the jet portion is wedge-shaped, and an inclined guide portion is provided at the lower end in the rotation direction of the jet portion, and a penetrating arc-shaped jet pipe is provided in the middle of the jet portion, one end of the arc-shaped jet pipe is directed toward the center of the drying cylinder, and the other end of the arc-shaped jet pipe is directed toward the wall of the drying cylinder.

[0009] Preferably in the present invention, a plurality of spirally distributed guide plates are provided at the lower end of the annular tube body, and a bracket rotatably connected to the heating rod is provided between the bottom ends of the guide plates.

[0010] Preferably in the present invention, the dredging mechanism includes a fixed sleeve connected to the end of the discharge pipe, and a dredging nozzle is slidably installed inside the fixed sleeve, an electric push rod is installed on the side of the fixed sleeve to drive the dredging nozzle to move forward and backward, and the front end position of the fixed sleeve is a trumpet-shaped structure.

[0011] Preferably in the present invention, the dredging mechanism further comprises a dredging ring rotatably connected to the heating rod, and a plurality of spiral elastic rods are installed on the top of the dredging ring, and a plurality of paddles are also installed on the top of the dredging ring.

[0012] Preferably in the present invention, the spray mechanism comprises a connecting joint, a distribution pipe and a plurality of atomizing nozzles in order from top to bottom, the bottom end of the distribution pipe is a trumpet-shaped structure, and the atomizing nozzle is installed at the bottom position of the distribution pipe.

[0013] Preferably in the present invention, the distribution pipe is rotatably installed between the connecting joint and the portal frame, and a driving motor for driving the distribution pipe to rotate is installed on the portal frame. The bottom end of the distribution pipe is also provided with a positioning bolt rotatably connected to the top of the heating rod.

[0014] Preferably in the present invention, the heat preservation cover comprises a jacket fitted on the outside of the drying cylinder and a heat preservation sleeve sleeved on the outside of the jacket, a drain valve is provided at the bottom of the side of the jacket, and a reflux pipe connected to the inside of the drying cylinder is provided at the bottom of the jacket.

[0015] Preferably in the present invention, the return pipe is in an arc-shaped structure, and a strip-shaped slit facing the middle of the drying cylinder is provided on the surface of the return pipe.

[0016] Compared with the prior art, the present invention provides a spray drying device for protein powder production, which has the following beneficial effects: In the present invention, the heater heats the air blown in by the blower, and the hot air evenly enters the hot air dispersion mechanism from the annular cavity of the drying cylinder. The hot air dispersion mechanism rotates at the upper end of the drying cylinder, thereby forming a hot air vortex with spiral flow inside the drying cylinder. The protein fluid is pressurized by the high-pressure delivery pump and sprayed out from the spray mechanism at high speed. The protein fluid with mist distribution diffuses downward in an umbrella shape from the center of the hot air vortex. The protein particles diffused in an umbrella shape are impacted by two air flows, one of which entrains the protein particles and moves in a spiral motion, and the other forms a spiral wind curtain on the inner wall of the drying cylinder to prevent the protein particles from adhering to the surface of the drying cylinder and quickly blow away the protein particles that hit the drying cylinder. The protein powder enters the discharge pipe and follows the hot air flow into the spiral separator and the bag dust collector. When the protein powder enters the discharge pipe, a dredging mechanism connected with the hot air is provided at one end of the discharge pipe to stir up the protein powder in the pipe and heat and insulate the air flow again to speed up the air circulation and effectively avoid the protein powder from agglomerating and hanging on the wall in the discharge pipe, thereby maintaining the stability of protein transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a spray drying device for producing protein powder proposed by the present invention; Figure 2A schematic diagram of the partial structure of a spray drying device for producing protein powder proposed by the present invention; Figure 3 A schematic diagram of the spray mechanism structure of a spray drying device for protein powder production proposed by the present invention; Figure 4 A schematic diagram of the structure of a heat preservation cover of a spray drying device for protein powder production proposed by the present invention; Figure 5 A schematic diagram of the structure of a dredging mechanism for a spray drying device for producing protein powder proposed by the present invention; Figure 6 This is a schematic diagram of the structure of a dredging ring of a spray drying device for protein powder production proposed by the present invention; Figure 7 A schematic diagram of the distribution structure of a hot air dispersion mechanism of a spray drying device for protein powder production proposed by the present invention; Figure 8 This is a schematic diagram of the hot air dispersion mechanism structure of a spray drying device for protein powder production proposed by the present invention; Fig. 9 The present invention provides a schematic cross-sectional structural diagram of a hot air dispersion mechanism of a spray drying device for producing protein powder.

[0018] In the figure: 1 equipment support, 2 dredging mechanism, 21 fixed sleeve, 22 electric push rod, 23 dredging nozzle, 24 paddle, 25 dredging ring, 26 spiral elastic rod, 3 heating rod, 4 discharge pipe, 5 spray mechanism, 51 connecting joint, 52 distribution pipe, 53 atomizing nozzle, 54 positioning bolt, 6 three-way solenoid valve, 7 bag dust separator, 8 spiral separator, 9 heater, 10 hot air dispersion mechanism, 101 annular pipe body, 102 jet part, 103 guide plate, 104 bracket, 105 arc jet pipe, 106 arc groove, 11 drying cylinder, 12 insulation cover, 121 jacket, 122 insulation cover, 123 return pipe, 13 blower, 14 high-pressure delivery pump, 15 door frame. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0020] Reference Figure 1-Figure 9A spray drying device for protein powder production comprises an equipment support 1, a bag dust separator 7, a spiral separator 8, a door frame 15, a blower 13 and a high-pressure delivery pump 14 are sequentially installed on the top of the equipment support 1, a drying cylinder 11 is installed inside the door frame 15, and a hot air dispersion mechanism 10 is rotatably installed on the top of the drying cylinder 11, a spray mechanism 5 is fixedly installed on the top of the door frame 15, and the spray mechanism 5 is rotatably connected to the hot air dispersion mechanism 10, an annular cavity rotatably matched with the hot air dispersion mechanism 10 is arranged on the top of the drying cylinder 11, a heater 9 is installed between the blower 13 and the annular cavity through a pipeline, the outlet of the high-pressure delivery pump 14 is connected to the spray mechanism 5 through a pipeline, and the drying cylinder 11 A laterally distributed discharge pipe 4 is installed at the bottom, and the outlet end of the discharge pipe 4 is connected to the spiral separator 8 through a pipeline, and the outlet of the spiral separator 8 is connected to the bag dust separator 7 through a pipeline, and a three-way solenoid valve 6 is installed at the exhaust end of the bag dust separator 7, a heat preservation cover 12 is provided on the outer side of the drying cylinder 11, and the air inlet end of the heat preservation cover 12 is connected to one of the outlets of the three-way solenoid valve 6 through a pipeline, a dredging mechanism 2 is installed at the other end of the discharge pipe 4, and one end of the dredging mechanism 2 is connected to the air outlet of the heater 9 through a pipeline, a heating rod 3 extending to the inside of the drying cylinder 11 is installed in the middle of the discharge pipe 4, and a main driving motor for driving the hot air dispersion mechanism 10 to rotate is installed inside the door frame 15.

[0021] In the present invention, the heater 9 heats the air blown in by the blower 13, and the hot air evenly enters the hot air dispersing mechanism 10 from the annular cavity of the drying cylinder 11. The hot air dispersing mechanism 10 rotates at the upper end of the drying cylinder 11, thereby forming a hot air vortex with spiral flow inside the drying cylinder 11. The protein fluid is pressurized by the high-pressure delivery pump 14 and is ejected from the spray mechanism 5 at high speed. The protein fluid in the form of mist spreads downward in an umbrella shape from the center of the hot air vortex, and the hot air quickly takes away the moisture in the protein. A heating rod 3 is provided at the position to provide auxiliary heating at the center of the hot air vortex to keep the temperature inside and outside the drying cylinder 11 consistent. The protein powder enters the discharge pipe 4 and follows the hot air flow into the spiral separator 8 and the bag dust separator 7. When the protein powder enters the discharge pipe 4, a dredging mechanism 2 connected to the hot air is provided at one end of the discharge pipe 4 to agitate the protein powder in the pipeline and heat and insulate the airflow again to speed up the air circulation, effectively avoiding the protein powder from agglomerating and hanging on the wall in the discharge pipe, thereby maintaining the stability of protein transportation.

[0022] Reference Figure 7-Figure 9The hot air dispersion mechanism 10 includes an annular tube body 101, and the outer side surface of the annular tube body 101 is provided with a plurality of arc grooves 106 connected with the annular cavity, the bottom end of the annular tube body 101 is in a trumpet-shaped structure, and the inner wall of the annular tube body 101 is provided with a plurality of air jets 102 protruding toward the center of the circle. In the present invention, when the annular tube body 101 rotates rapidly inside the drying cylinder 11, exhaust is synchronously discharged on both sides of the air jets 102, and two layers of hot air vortexes are formed at the upper end of the drying cylinder 11. When the protein fluid diffuses in an umbrella shape, the air jets 102 protruding toward the center of the circle impact and disturb the protein particles, cooperate with the spiral motion of the hot air, accelerate the separation speed of water in the protein particles, and avoid the occurrence of untimely drying caused by protein agglomeration.

[0023] As a further solution in the present invention, the bottom end of the jet portion 102 is wedge-shaped, and an inclined guide portion is provided at the lower end of the jet portion 102 in the rotation direction. A penetrating arc-shaped jet pipe 105 is provided in the middle of the jet portion 102, one end of the arc-shaped jet pipe 105 is directed toward the center of the drying cylinder 11, and the other end of the arc-shaped jet pipe 105 is directed toward the wall of the drying cylinder 11. In the present invention, the umbrella-shaped diffused protein particles are impacted by two airflows, one of which entrains the protein particles in a spiral motion, and the other forms a spiral wind curtain on the inner wall of the drying cylinder 11, thereby preventing the protein particles from adhering to the surface of the drying cylinder 11, quickly blowing away the protein particles that impact the drying cylinder 11, avoiding the wall hanging phenomenon, and accelerating the flow rate of the protein.

[0024] As a further solution in the present invention, a plurality of spirally distributed guide plates 103 are provided at the lower end of the annular tube body 101, and a bracket 104 rotatably connected to the heating rod 3 is provided between the bottom ends of the guide plates 103. In the present invention, the spirally distributed guide plates 103 rotate in close contact with the inner wall of the drying cylinder 11, agitate the peripheral protein particles and hot air and guide them toward the middle, keep the inner wall of the drying cylinder 11 clean, and exert a downward spiral thrust on the contacted hot air and protein powder, thereby further improving the flow drying efficiency of the protein and preventing the protein from hanging on the wall inside the drying cylinder 11.

[0025] Reference Figure 5 and Figure 6The dredging mechanism 2 includes a fixed sleeve 21 connected to the end of the discharge pipe 4, and a dredging nozzle 23 is slidably installed inside the fixed sleeve 21, and an electric push rod 22 is installed on the side of the fixed sleeve 21 to drive the dredging nozzle 23 to move forward and backward. The front end of the fixed sleeve 21 is in a trumpet-shaped structure. In the present invention, the dredging nozzle 23 is driven by the electric push rod 22 to telescope at the connection between the drying cylinder 11 and the discharge pipe 4, and the dredging nozzle 23 is used to spray compressed hot air toward the outlet of the discharge pipe 4, which effectively drives the protein powder inside the discharge pipe 4 to move quickly, and replenishes the heat lost on the surface of the discharge pipe 4, so as to avoid the protein powder from agglomerating inside the discharge pipe 4.

[0026] As a further solution in the present invention, the dredging mechanism 2 also includes a dredging ring 25 rotatably connected to the heating rod 3, and a plurality of spiral elastic rods 26 are installed on the top of the dredging ring 25, and a plurality of wind paddles 24 are also installed on the top of the dredging ring 25. In the present invention, the dredging ring 25 is located at the air outlet position of the dredging nozzle 23. When the dredging nozzle 23 sprays compressed air, the wind paddle 24 and the spiral elastic rod 26 are blown to rotate, thereby driving the material in the discharge port of the drying cylinder 11 to vibrate and discharge. At the same time, when the spiral elastic rod 26 rotates, it diffuses outward under the action of centrifugal force, and the diffusion range changes with the movement of the distance between the dredging nozzle 23 and the wind paddle 24, thereby effectively performing a dredging operation on the discharge port of the drying cylinder 11 and further reducing the risk of protein blockage.

[0027] Reference Figure 1-Figure 3 The spray mechanism 5 includes a connecting joint 51, a distribution pipe 52 and a plurality of atomizing nozzles 53 from top to bottom. The bottom end of the distribution pipe 52 is a trumpet-shaped structure, and the atomizing nozzle 53 is installed at the bottom position of the distribution pipe 52. In the present invention, the protein fluid enters the distribution pipe 52 after being pressurized, and then enters the drying cylinder 11 through the plurality of atomizing nozzles 53, so as to keep the spraying range of each atomizing nozzle 53 consistent and avoid the imbalance of the local protein particle concentration.

[0028] As a further solution in the present invention, the distribution pipe 52 is rotatably installed between the connecting joint 51 and the door frame 15, and a driving motor for driving the distribution pipe 52 to rotate is installed on the door frame 15. The bottom end of the distribution pipe 52 is also provided with a positioning bolt 54 rotatably connected to the top of the heating rod 3. In the present invention, the distribution pipe 52 is driven by the motor to rotate in the opposite direction to the hot air dispersion mechanism 10, thereby increasing the dispersion range of the protein particles. At the same time, the heat exchange efficiency between the protein particles and the hot air flow is accelerated, thereby improving the spray drying efficiency.

[0029] Reference Figure 4 and Figure 5The heat preservation cover 12 includes a jacket 121 that fits the outside of the drying cylinder 11, and a heat preservation sleeve 122 that is sleeved on the outside of the jacket 121. A drain valve is provided at the bottom of the side of the jacket 121, and a return pipe 123 connected to the inside of the drying cylinder 11 is provided at the bottom of the jacket 121. In the present invention, the hot air separated from the protein powder is connected to the heat preservation cover 12 through a pipeline, so that the drying cylinder 11 is effectively insulated and the energy consumption of the equipment is reduced. At the same time, part of the hot air is connected to the bottom position of the drying cylinder 11 through the return pipe 123, and the internal temperature of the drying cylinder 11 is regulated to avoid high temperature of the outlet line inside the drying cylinder 11 and improve the temperature control sensitivity of the equipment.

[0030] As a further solution in the present invention, the return pipe 123 has an arc-shaped structure, and a strip slit is provided on the surface of the return pipe 123 toward the middle of the drying cylinder 11. In the present invention, when the internal temperature of the drying cylinder 11 needs to be regulated, the heated air in the thermal insulation cover 12 enters the drying cylinder 11 from the bottom upward through the return pipe 123, and is blown in in strips through the strip slits, thereby increasing the exchange range with the hot air inside the drying cylinder 11 and improving the speed of temperature regulation.

[0031] When in use, the heater 9 heats the air blown in by the blower 13, and the hot air evenly enters the hot air dispersion mechanism 10 from the annular cavity of the drying cylinder 11. The hot air dispersion mechanism 10 rotates at the upper end of the drying cylinder 11, thereby forming a hot air vortex with spiral flow inside the drying cylinder 11. The protein fluid is pressurized by the high-pressure delivery pump 14 and is ejected from the spray mechanism 5 at high speed. The protein fluid in a mist-like distribution diffuses downward in an umbrella shape from the center of the hot air vortex, and the hot air quickly takes away the moisture in the protein. A heating rod 3 is provided at the position to provide auxiliary heating at the center of the hot air vortex to keep the temperature inside and outside the drying cylinder 11 consistent. The protein powder enters the discharge pipe 4 and follows the hot air flow into the spiral separator 8 and the bag dust separator 7. When the protein powder enters the discharge pipe 4, a dredging mechanism 2 connected to the hot air is provided at one end of the discharge pipe 4 to agitate the protein powder in the pipeline and heat and insulate the airflow again to speed up the air circulation, effectively avoiding the protein powder from agglomerating and hanging on the wall in the discharge pipe, thereby maintaining the stability of protein transportation.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A spray drying device for producing protein powder, comprising a device support (1), a bag dust separator (7), a spiral separator (8), a door frame (15), a blower (13) and a high-pressure delivery pump (14) are sequentially installed on the top of the device support (1), characterized in that: A drying cylinder (11) is installed inside the door frame (15), and a hot air dispersion mechanism (10) is rotatably installed on the top of the drying cylinder (11). A spray mechanism (5) is fixedly installed on the top of the door frame (15), and the spray mechanism (5) is rotatably connected to the hot air dispersion mechanism (10). An annular cavity rotatably matched with the hot air dispersion mechanism (10) is provided on the top of the drying cylinder (11). A heater (9) is installed between the blower (13) and the annular cavity via a pipeline. The outlet of the high-pressure delivery pump (14) is connected to the spray mechanism (5) via a pipeline. A transversely distributed discharge pipe (4) is installed at the bottom of the drying cylinder (11), and the outlet end of the discharge pipe (4) is connected to the spiral separator (8) via a pipeline. The outlet of the spiral separator (8) is connected to the bag dust separator (7) through a pipeline, the exhaust end of the bag dust separator (7) is installed with a three-way solenoid valve (6), the outer side of the drying cylinder (11) is provided with a heat preservation cover (12), and the air inlet end of the heat preservation cover (12) is connected to one of the outlets of the three-way solenoid valve (6) through a pipeline, the other end of the discharge pipe (4) is installed with a dredging mechanism (2), and one end of the dredging mechanism (2) is connected to the air outlet of the heater (9) through a pipeline, the middle part of the discharge pipe (4) is installed with a heating rod (3) extending to the inside of the drying cylinder (11), and the main driving motor for driving the hot air dispersion mechanism (10) to rotate is installed inside the door frame (15).

2. A spray drying device for protein powder production according to claim 1, characterized in that, The hot air dispersion mechanism (10) comprises an annular tube body (101), and the outer side surface of the annular tube body (101) is provided with a plurality of arc-shaped grooves (106) connected to the annular cavity, the bottom end of the annular tube body (101) is a trumpet-shaped structure, and the inner wall of the annular tube body (101) is provided with a plurality of air-jet portions (102) protruding toward the center of the circle.

3. A spray drying device for protein powder production according to claim 2, characterized in that, The bottom end of the jet portion (102) is wedge-shaped, and an inclined flow guide portion is provided at the lower end of the jet portion (102) in the rotation direction. A penetrating arc-shaped jet pipe (105) is provided in the middle of the jet portion (102), one end of the arc-shaped jet pipe (105) faces the center of the drying cylinder (11), and the other end of the arc-shaped jet pipe (105) faces the wall of the drying cylinder (11).

4. A spray drying device for protein powder production according to claim 3, characterized in that, A plurality of helically distributed guide plates (103) are provided at the lower end of the annular tube body (101), and a bracket (104) rotatably connected to the heating rod (3) is provided between the bottom ends of the guide plates (103).

5. A spray drying device for protein powder production according to claim 1, characterized in that, The dredging mechanism (2) comprises a fixed sleeve (21) connected to the end of the discharge pipe (4), and a dredging nozzle (23) is slidably mounted inside the fixed sleeve (21). An electric push rod (22) is mounted on the side of the fixed sleeve (21) to drive the dredging nozzle (23) to move forward and backward. The front end of the fixed sleeve (21) is in a bell-shaped structure.

6. A spray drying device for protein powder production according to claim 5, characterized in that, The dredging mechanism (2) further comprises a dredging ring (25) rotatably connected to the heating rod (3), and a plurality of spiral elastic rods (26) are mounted on the top of the dredging ring (25). A plurality of paddles (24) are also mounted on the top of the dredging ring (25).

7. A spray drying device for protein powder production according to claim 4, characterized in that, The spray mechanism (5) comprises, from top to bottom, a connecting joint (51), a distribution pipe (52), and a plurality of atomizing nozzles (53); the bottom end of the distribution pipe (52) is in a trumpet-shaped structure, and the atomizing nozzles (53) are installed at the bottom of the distribution pipe (52).

8. A spray drying device for protein powder production according to claim 7, characterized in that, The distribution pipe (52) is rotatably mounted between the connection joint (51) and the door frame (15), and a driving motor for driving the distribution pipe (52) to rotate is mounted on the door frame (15). The bottom end of the distribution pipe (52) is also provided with a positioning bolt (54) rotatably connected to the top of the heating rod (3).

9. A spray drying device for protein powder production according to claim 1, characterized in that, The heat-insulating cover (12) comprises a jacket (121) fitted on the outside of the drying cylinder (11), and a heat-insulating sleeve (122) sleeved on the outside of the jacket (121); a drain valve is provided at the bottom of the side of the jacket (121); and a return pipe (123) communicating with the interior of the drying cylinder (11) is provided at the bottom of the jacket (121).

10. A spray drying device for protein powder production according to claim 9, characterized in that: The return pipe (123) has an arc-shaped structure, and a strip-shaped slit facing the middle of the drying cylinder (11) is provided on the surface of the return pipe (123).

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