A low-temperature vacuum spray drying method for processing camel milk

Abstract

The application discloses a low-temperature vacuum spray drying method for processing camel milk, and has the beneficial effects that the camel milk can be atomized, dried and finally recovered through the cooperation of a raw material supply system, an air purification and heat supply system, an atomization system, a drying tower main body and a powder treatment system, camel milk wall sticking is avoided, material adhesion and accumulation are reduced, and good processing effects are achieved.

Description

Technical Field

[0001] This invention relates to the field of camel milk processing technology, specifically to a low-temperature vacuum spray drying method for processing camel milk. Background Technology

[0002] Conventional milk spray drying towers, when used directly for camel milk processing, are prone to problems such as uneven drying, sticking and scorching, severe protein denaturation, low product solubility, and significant nutrient loss, making them unsuitable for the needs of large-scale camel milk production.

[0003] Conventional spray drying equipment is mostly designed for cow's milk, with parameters such as inlet air temperature, air volume, atomization pressure, and tower structure being highly generalized, lacking specific optimization for the characteristics of camel milk. Traditional high-temperature spray drying processes (inlet air temperature 180-200℃, outlet air temperature 80-95℃) also have defects such as uneven hot air distribution, poor atomization adaptability, insufficient anti-sticking effect, and poor material discharge, resulting in low yield of camel milk powder, unstable quality, and high loss rate of core nutrients, making it difficult to meet the market's requirements for the production and patent innovation of high-quality camel milk powder. Summary of the Invention

[0004] The purpose of this invention is to provide a solution to the above-mentioned problems, as detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a low-temperature vacuum spray drying method for processing camel milk, comprising the following steps: a. Equipment cleaning: b. Vacuuming the equipment: c. Purified hot air supply and stable hot air intake: d. Camel milk atomization and low-temperature vacuum instantaneous drying; e. Milk powder sedimentation and closed-loop discharge collection: f. Fine powder separation and recovery, and emission in compliance with standards.

[0006] Preferably, in step c, ambient air passes through a three-stage air filtration system consisting of a primary purifier, a secondary purifier, and a high-efficiency purifier. After purification, the air enters an indirect hot water heat exchanger heater, which uses a non-contact heating method. Once heated to the set temperature, the air is evenly and tangentially introduced into the top of the drying tower via a spiral air distribution device at the top of the tower, forming a hot air field inside the tower that flows from top to bottom with a stable flow rate and uniform temperature.

[0007] Preferably, in step c, the inlet air temperature is constantly controlled at 130℃-150℃; the hot air velocity is 0.3-0.5m / s; and the hot air pressure is 150-200Pa.

[0008] Preferably, after the temperature, wind speed, and heat sealing are stabilized in step c, the camel milk is atomized and subjected to low-temperature vacuum instantaneous drying in step d. The pretreated camel milk is transported to the atomizing nozzle device at the top of the tower at a constant speed and pressure by a variable frequency high-pressure pump, atomizing the camel milk into tiny droplets with uniform particle size. In a vacuum negative pressure environment, the tiny droplets come into full contact with the low-temperature hot air inside the tower in the opposite direction, and the moisture inside the droplets is rapidly vaporized and evaporated, completing dehydration and drying in a very short time to form solid camel milk powder particles with excellent flowability.

[0009] Preferably, in step d, the camel milk feed flow rate is 1100-1200 kg / h, the atomized droplet size is 50-80 μm, the vacuum degree inside the tower is kept constant at 8-12 kPa (negative pressure), the material residence time is 15-20 s, and the exhaust temperature is stably controlled at 60℃.

[0010] Preferably, after step d is completed, the process proceeds to step e, where the dried solid camel milk powder particles settle at a constant speed to the settling section of the tower cone under the combined action of their own gravity and the airflow inside the tower. The settling is assisted by optimizing the cone angle and low-frequency vibration. After the qualified milk powder continues to settle, it is discharged in a sealed manner through the air-closed unloader at the bottom of the tower and the vibrating discharge device. The vacuum level inside the tower is maintained stable throughout the process to prevent backflow of external air from disturbing the hot air field and to avoid oxidation and moisture absorption of the powder. After discharge, the powder directly enters the low-temperature cooling module and is rapidly cooled to below 25°C.

[0011] Preferably, in step e, the vibration frequency of the tower cone is controlled at 15-20Hz, the powder outlet temperature is ≤30℃, and the moisture content of the finished milk powder is 3.0%-3.5%.

[0012] Preferably, after step e is completed, step f is entered, where fine powder is separated, recovered, and discharged in compliance with standards. The dried hot air carries a small amount of light camel milk fine powder and is discharged from the tower outlet. It then enters a two-stage separation and recovery system consisting of a cyclone separator and a bag filter. First, the large-diameter fine powder is recovered by centrifugation through the cyclone separator, and then a trace amount of ultrafine powder is filtered by a food-grade filter bag. All the fine powder recovered in both stages is returned to the finished product silo, thereby improving the powder recovery rate.

[0013] Preferably, in step f, the separation velocity of the cyclone separator is ≤1.5m / s; and the filtration velocity of the bag filter is 0.8-1.0m / min.

[0014] Preferably, after step e is completed, the process proceeds to step f, where fine powder is separated, recovered, and discharged in compliance with standards. The dried hot gas carries a small amount of light camel milk fine powder and is discharged from the tower outlet. It then enters the two-stage cyclone separator recovery system, and after recovery, it is transported through pipelines back into the tower and enters the primary discharge stage together with the new powder.

[0015] The beneficial effects are as follows: This invention, through the cooperation of a raw material supply system, an air purification and heating system, an atomization system, a drying tower body, and a powder processing system, can achieve atomized drying of camel milk through air purification, atomization, drying, and final recycling, thus avoiding camel milk sticking to the wall, reducing material adhesion and accumulation, and achieving good processing results. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] The annotations in the attached figures are explained as follows: 101. Primary air purifier; 102. Medium-efficiency air purifier; 103. High-efficiency air purifier; 2. Roots blower; 3. Indirect hot water heat exchanger; 4. Spiral air distribution device; 5. Vacuum drying tower; 6. Sight glass window; 701. First position temperature sensor; 702. Second position temperature sensor; 703. Third position sensor; 704. Fourth position sensor; 8. Vacuum sensor; 9. Tower door; 10. Vacuum degree display; 11. Drying tower body; 12. Tower cone; 13. Side air hammer; 14. Vibration motor; 15. Fluidized bed; 16. Discharge port; 17. Agglomeration pipe; 18. Exhaust vent; 19. Cleaning spray structure; 20. First cyclone separator; 21. Bag filter; 22. Second cyclone separator; 23. Y-type exhaust fan; 24. Atomizing nozzle device; 25. Tower bottom closed air unloader. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] See Figure 1 As shown, this invention provides a low-temperature vacuum spray drying method for processing camel milk, comprising the following steps: a. Equipment cleaning: The tower body and powder discharge components are cleaned using the cleaning spray structure 19 located at the top of the tower. b. Vacuuming the equipment; Vacuuming is performed using a vacuuming device located on one side of the vacuum drying tower 5: c. Purified hot air supply and stable hot air intake: d. Camel milk atomization and low-temperature vacuum instantaneous drying; e. Milk powder sedimentation and closed-loop discharge collection: f. Fine powder separation and recovery, and emission in compliance with standards.

[0021] In this embodiment, in step c, ambient air passes through a three-stage air filtration system consisting of a primary air purifier 101, a medium-efficiency air purifier 102, and a high-efficiency air purifier 103. After purification, the air enters the indirect hot water heat exchanger 3, where it is heated to a set temperature using a non-contact heating method. Then, it enters the top of the drying tower tangentially via the spiral air distribution device 4 at the top of the tower, forming a top-down, stable, and uniformly heated airflow field within the tower. The air purification components, the Roots blower 2, the indirect hot water heat exchanger 3, the first position temperature sensor 701, the spiral air distribution device 4, and the second position temperature sensor 702 together form an air purification and heating system. The air passes through the Roots blower 2, the indirect hot water heat exchanger 3, and the air distribution device to deliver heat to the drying tower body 11. The first position temperature sensor 701 is used to sense the temperature output from the heater, and the second position temperature sensor 702 is used to sense the temperature output from the spiral air distribution device 4.

[0022] Preferably, in step c, the inlet air temperature is constantly controlled at 130℃-150℃; the hot air velocity is 0.3-0.5m / s; and the hot air pressure is 150-200Pa.

[0023] In this embodiment, after the temperature, wind speed, and heat sealing are stabilized in step c, camel milk atomization and low-temperature vacuum instantaneous drying are performed in step d. The pretreated camel milk is uniformly and steadily transported to the atomizing nozzle device 24 at the top of the tower by a variable frequency high-pressure pump, atomizing the camel milk into tiny droplets with uniform particle size. In a vacuum negative pressure environment, the tiny droplets come into full contact with the low-temperature hot air inside the tower in the opposite direction, and the moisture inside the droplets quickly vaporizes and evaporates, completing dehydration and drying in a very short time, forming solid camel milk powder particles with excellent flowability. The drying tower body 11 includes a vacuum drying tower 5 and a tower cone 12; the air inlet pipe and atomizing nozzle structure are set on the vacuum drying tower 5, and the tower cone 12 is set at the bottom of the vacuum drying tower 5.

[0024] In this embodiment, the vacuum drying tower 5 is equipped with a vacuum sensor 8, an anti-sticking flow guide ring, a tower door 9, a vacuum degree display 10, and side air hammers 13. Multiple side air hammers 13 are provided, and these multiple side air hammers 13 are evenly distributed around the circumference of the vacuum drying tower 5. The vacuum sensor 8 is used to detect the vacuum degree of the vacuum drying tower 55, and the vacuum degree display 10 is used to display the vacuum degree of the vacuum drying tower 5. The tower door 9 is located on the vacuum drying tower 5, and the anti-sticking flow guide ring is located on the inner wall of the vacuum drying tower 5. In this embodiment, in step d, the camel milk feed flow rate is 1100-1200 kg / h, the atomized droplet size is 50-80 μm, the vacuum degree inside the tower is constant at 8-12 kPa (negative pressure), the material residence time is 15-20 s, and the exhaust temperature is stably controlled at 60℃.

[0025] In this embodiment, after step d is completed, the process proceeds to step e. The dried solid camel milk powder particles settle at a constant speed to the settling section of the tower cone 12 under the combined action of their own gravity and the airflow inside the tower. The settling is assisted by optimized cone angle and low-frequency vibration of the tower cone 12. After the qualified milk powder continues to settle, it is discharged in a sealed manner via the bottom air-closed unloader 25 and the vibrating discharge device, maintaining a stable vacuum level inside the tower throughout the process to prevent backflow of external air from disturbing the hot air field and to avoid oxidation and moisture absorption of the powder. After discharge, the powder directly enters the low-temperature cooling module for rapid cooling to below 25°C. The tower cone 12 is equipped with a third-position temperature sensor, a side air hammer 13, and a sight glass window 6. The third-position temperature sensor is used to detect the temperature inside the tower cone 12, and the side air hammer 13 is used to vibrate the tower cone 12. The powder processing system includes a powder discharge component and a powder recovery component. The powder discharge component is used to discharge structural powder, and the powder recovery component is used to recover the powder.

[0026] In this embodiment, the powder discharge assembly includes a bottom air-closed unloader 25, a vibrating discharge device, a fourth position temperature sensor, a fluidized bed 15, and a discharge port 16. The bottom air-closed unloader 25 is located at the bottom of the cone 12. The fourth position temperature sensor is located inside the discharge pipe for detecting the discharge pipe. The vibrating discharge device includes multiple vibrating motors 14 to prevent powder from sticking to the wall of the discharge pipe. The fluidized bed 15 fluidizes the powder. The discharge port 16 is located at the end of the discharge pipe.

[0027] The cylindrical vacuum drying tower 5, with a standard settling angle of 60° for the tower cone 12, is adapted to facilitate the smooth settling of camel milk powder and avoid powder accumulation and retention. The side wall is equipped with a low-frequency vibrating air hammer, which vibrates at regular intervals to prevent powder bridging and blockage. The bottom discharge module achieves closed and continuous discharge through the bottom air-closed unloader 25, vibrating discharge device, vibrating fluidized bed 15, and discharge port 16. The vacuum degree inside the tower is kept stable throughout the process to prevent external air backflow from disturbing the flow field inside the tower and to avoid powder oxidation. Milk powder sedimentation and closed-loop discharge collection: Dried solid camel milk powder granules settle at a uniform speed to the sedimentation section of cone 12 under the combined action of their own gravity and airflow within the tower. A 60° optimized cone angle and low-frequency vibration assist in preventing powder accumulation, bridging, and adhesion to the walls. After continuous sedimentation, the qualified milk powder is discharged in a closed-loop system via the bottom air-sealed unloader 25 and a vibrating discharge device. Throughout the process, the vacuum level within the tower is maintained stably to prevent backflow of external air from disturbing the hot air field and to avoid oxidation and moisture absorption of the powder. After discharge, the powder directly enters the low-temperature cooling module for rapid cooling to below 25°C. In this embodiment, in step e, the vibration frequency of the tower cone 12 is controlled at 15-20Hz, the powder outlet temperature is ≤30℃, and the moisture content of the finished milk powder is 3.0%-3.5%.

[0028] In this embodiment, after step e is completed, step f is entered, where fine powder is separated, recovered, and discharged in compliance with standards. The dried hot gas carries a small amount of light camel milk fine powder and is discharged from the tower outlet. It then enters the two-stage separation and recovery system of cyclone separator + bag filter 21. First, the large-diameter fine powder is recovered by centrifugation through the cyclone separator, and then the trace amount of ultrafine powder is filtered by food-grade filter bags. All the fine powder recovered in both stages is returned to the finished product silo, thereby improving the powder recovery rate.

[0029] In this embodiment, in step f, the separation velocity of the cyclone separator is ≤1.5m / s; the filtration velocity of the bag filter 21 is 0.8-1.0m / min.

[0030] In this embodiment, after step e is completed, step f is performed, where fine powder is separated, recovered, and discharged in compliance with standards. The dried hot air, carrying a small amount of light camel milk fine powder, is discharged from the tower outlet and enters the two-stage cyclone separator recovery system. After recovery, it is transported back into the tower through pipelines and enters the primary discharge stage together with the new powder. The powder recovery assembly includes a first cyclone separator 20, a bag filter 21, a second cyclone separator 22, a Y-type exhaust fan 23, and an exhaust port 18. The recovered powder is separated by the first cyclone separator 20 and the second cyclone separator 22, then exhausted by the Y-type exhaust fan 23 and recovered by the bag filter 21. Excess powder is recovered by the bag filter 21, and the air is discharged through the exhaust port 18. Fine powder separation and recovery, and emission compliance: The dried hot air carries a small amount of light camel milk fine powder and is discharged from the tower outlet. It then enters the two-stage separation and recovery system of cyclone separator + bag filter 21. First, the cyclone separator centrifuges and recovers large-diameter fine powder, and then the food-grade filter bag filters and intercepts trace amounts of ultrafine powder. All the fine powder recovered in both stages is returned to the finished product silo, improving the powder recovery rate.

[0031] In addition, an agglomeration pipe 17 and a cleaning spray structure 19 are provided; the cleaning spray structure 19 is located at the top of the tower and at the recovery powder recovery component, and the first cyclone separator 20 and the second cyclone separator 22 can also be connected to the top of the tower through the agglomeration pipe 17.

[0032] The beneficial effects are as follows: This invention, through the cooperation of a raw material supply system, an air purification and heating system, an atomization system, a drying tower body 11, and a powder processing system, can achieve atomized drying of camel milk through air purification, atomization, drying, and final recycling, thus avoiding camel milk sticking to the wall, reducing material adhesion and accumulation, and achieving good processing results.

[0033] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A low-temperature vacuum spray drying method for processing camel milk, characterized in that: Includes the following steps: a. Equipment cleaning: b. Vacuuming the equipment: c. Purified hot air supply and stable hot air intake: d. Camel milk atomization and low-temperature vacuum instantaneous drying; e. Milk powder sedimentation and closed-loop discharge collection: f. Fine powder separation and recovery, and emission in compliance with standards.

2. The low-temperature vacuum spray drying method for processing camel milk according to claim 1, characterized in that: In step c, ambient air at room temperature is purified by a three-stage air filtration system, consisting of a pre-filter, a medium-efficiency filter, and a high-efficiency filter. After purification, the air enters the indirect hot water heat exchanger heater, which uses a non-contact heating method. After being heated to the set temperature, the air enters the top of the drying tower tangentially through the spiral air distribution device at the top of the tower, forming a hot air field with a stable flow rate and uniform temperature from top to bottom inside the tower.

3. The low-temperature vacuum spray drying method for processing camel milk according to claim 2, characterized in that: In step c, the inlet air temperature is kept constant at 130℃-150℃; the hot air velocity is 0.3-0.5m / s; and the hot air pressure is 150-200Pa.

4. The low-temperature vacuum spray drying method for processing camel milk according to claim 1, characterized in that: After the temperature, wind speed, and heat sealing are stabilized in step c, camel milk atomization and low-temperature vacuum instantaneous drying are carried out in step d. The pretreated camel milk is transported to the atomizing nozzle device at the top of the tower at a constant speed and pressure by a variable frequency high-pressure pump, atomizing the camel milk into tiny droplets with uniform particle size. In a vacuum negative pressure environment, the tiny droplets come into full contact with the low-temperature hot air in the tower in the opposite direction, and the moisture inside the droplets quickly vaporizes and evaporates, completing dehydration and drying in a very short time, forming solid camel milk powder particles with excellent flowability.

5. The low-temperature vacuum spray drying method for processing camel milk according to claim 4, characterized in that: In step d, the camel milk feed flow rate is 1100-1200 kg / h, the atomized droplet size is 50-80 μm, the vacuum degree inside the tower is kept constant at 8-12 kPa (negative pressure), the material residence time is 15-20 s, and the exhaust temperature is stably controlled at 60℃.

6. The low-temperature vacuum spray drying method for processing camel milk according to claim 1, characterized in that: After step d is completed, the process proceeds to step e. The dried solid camel milk powder granules settle at a constant speed to the settling section of the tower cone under the combined action of their own gravity and the airflow inside the tower. The settling is assisted by optimizing the cone angle and low-frequency vibration. After the qualified milk powder continues to settle, it is discharged in a sealed manner through the air-closed unloader at the bottom of the tower and the vibrating discharge device. The vacuum level inside the tower is maintained throughout the process to prevent backflow of external air from disturbing the hot air field and to avoid oxidation and moisture absorption of the powder. After discharge, the powder directly enters the low-temperature cooling module and is rapidly cooled to below 25°C.

7. The low-temperature vacuum spray drying method for processing camel milk according to claim 6, characterized in that: In step e, the vibration frequency of the tower cone is controlled at 15-20Hz, the powder outlet temperature is ≤30℃, and the moisture content of the finished milk powder is 3.0%-3.5%.

8. The low-temperature vacuum spray drying method for processing camel milk according to claim 1, characterized in that: After step e is completed, the process proceeds to step f, where fine powder is separated, recovered, and discharged in compliance with standards. The dried hot air, carrying a small amount of light camel milk fine powder, is discharged from the tower outlet and sequentially enters a two-stage separation and recovery system consisting of a cyclone separator and a bag filter. First, the cyclone separator centrifuges and recovers large-diameter fine powder, and then the food-grade filter bag filters and retains trace amounts of ultrafine powder. All the fine powder recovered in both stages is returned to the finished product silo, improving the powder recovery rate.

9. The low-temperature vacuum spray drying method for processing camel milk according to claim 8, characterized in that: In step f, the separation velocity of the cyclone separator is ≤1.5m / s; the filtration velocity of the bag filter is 0.8-1.0m / min.

10. The low-temperature vacuum spray drying method for processing camel milk according to claim 1, characterized in that: After step e is completed, proceed to step f, where fine powder is separated, recovered, and discharged in compliance with standards. The dried hot gas carries a small amount of light camel milk fine powder and is discharged from the tower outlet. It then enters the two-stage cyclone separator recovery system. After recovery, it is transported through pipelines to the tower and enters the primary discharge stage together with the new powder.

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