A dynamic oxidation protection system and method based on nitrogen medium circulation in a fat powder production process

Abstract

The application discloses a kind of dynamic oxidation protection system and method based on nitrogen medium circulation in fat powder production process, it is related to food and feed processing field, comprising the following steps: S1, nitrogen cooled to 5-15 ℃ is passed into fat powder spray cooling tower, and the dew point control target of the circulating nitrogen is set to ≤40 ℃, the temperature cooperates with dew point parameter, aims at realizing efficient cooling, preventing product moisture absorption and controlling system condensation simultaneously;S2, the cooling nitrogen is contacted with atomized fat droplets in tower, carries out cooling and dynamic oxygen isolation, and carries out fine powder and moisture;The dynamic oxidation protection system and method based on nitrogen medium circulation in fat powder production process, nitrogen is used as cooling medium to isolate oxygen from the source, cooperate closed loop circulation to maintain inert environment, so that the peroxide value of product is reduced by more than 60% compared with air cooling process, and the quality of product is realized leap.

Description

Technical Field

[0001] This invention relates to food and feed processing technology, specifically to a dynamic oxidation protection system and method based on nitrogen medium circulation in the production process of fat powder. Background Technology

[0002] The core research and development background of improving the peroxide value of fat powder is to solve the problem of oxidative deterioration in production, storage and application: Fat powder (such as animal and vegetable oil powder for feed / food) contains unsaturated fatty acids, which are easily oxidized by oxygen, temperature, light and other factors, leading to an increase in peroxide value, causing off-flavors, nutrient loss, and may also produce harmful substances, affecting product stability, safety and palatability.

[0003] Meanwhile, the industry is constantly raising its requirements for fat powder storage period, transportation conditions, and application scenarios (such as high-temperature processing and long-term storage of feed). Traditional antioxidants (such as BHA and BHT) have problems such as dosage limitations and single effect. There is an urgent need to reduce peroxide value in a targeted manner through formula optimization and production process improvement, so as to balance safety and practicality.

[0004] In the production process of fat powders (such as palmitic acid fat powder, stearic acid fat powder, etc.), the spray drying or spray cooling and solidification stage requires air cooling to quickly solidify the atomized fat droplets. Traditional processes often use air as the cooling medium, but the oxygen in the air easily reacts with the unsaturated fatty acids in the fat powder, leading to an increase in the product's peroxide value, resulting in off-odors, nutrient loss, and other problems, which seriously affect product quality and storage stability.

[0005] Meanwhile, the cooling process of high-melting-point fatty acid powders (such as stearic acid fatty acid powder) requires a cooling medium with a lower temperature. Traditional air cooling has limited efficiency, and high air humidity can easily cause the fatty acid powder to absorb moisture and clump. In addition, directly discharging the cooled air not only wastes energy but may also carry away fine fatty acid powder, causing material loss and environmental pollution. Therefore, there is an urgent need for an air-cooling and recovery system that can avoid oxidation, improve cooling efficiency, and is energy-saving and environmentally friendly. Summary of the Invention

[0006] The purpose of this invention is to provide a dynamic oxidation protection system and method based on nitrogen medium circulation in the production process of fat powder, so as to solve the oxidation defects caused by air cooling in the prior art, as well as the problems of high cost of simple nitrogen protection schemes and the inability of existing general gas circulation technology to adapt to the working conditions of fat powder production.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a dynamic oxidation protection method based on nitrogen medium circulation during the production of fat powder, comprising the following steps:

[0008] S1. Introduce nitrogen gas cooled to 5-15°C into the fat powder spray cooling tower, and set the dew point control target of the circulating nitrogen gas to ≤40°C. This temperature and dew point parameter work together to simultaneously achieve efficient cooling, prevent product moisture absorption, and control condensation within the system.

[0009] S2. The cooling nitrogen gas is brought into contact with the atomized fat droplets inside the tower to cool and isolate them from dynamic oxygen, and to carry out fine powder and moisture.

[0010] While solidification and cooling are completed, a dynamic inert atmosphere is formed to isolate oxygen and carry out fine powder and moisture.

[0011] S3. The nitrogen gas after being loaded with dirt is sequentially subjected to dust separation, deep dehumidification treatment to dew point ≤40℃ and precision filtration.

[0012] The nitrogen gas carrying the pollutant is subjected to physical separation of grease and dust, and deep purification treatment aimed at restoring the dryness (dew point ≤40℃) and cleanliness of the nitrogen gas.

[0013] S4. The purified nitrogen is returned to the cooling step for recycling, and the circulation parameters are monitored in real time to dynamically adjust the system operation with the goal of keeping the product peroxide value below the preset threshold.

[0014] The purified and regenerated nitrogen is returned to the system for recycling, and key parameters of the circulation loop are monitored in real time. The system aims to maintain the peroxide value of the produced fat powder in a stable and compliant manner. By dynamically adjusting the nitrogen replenishment, venting, and cooling power, the system achieves efficient and stable nitrogen circulation.

[0015] Furthermore, in step S1, the nitrogen cooling temperature is set in conjunction with the dew point control target to simultaneously optimize cooling efficiency, prevent product moisture absorption, and control condensation within the control system.

[0016] Furthermore, the deep dehumidification treatment in step S3 adopts an adsorption drying method, and the selection of adsorbent and regeneration cycle are optimized for the oil aerosol and moisture mixed pollutants generated in the production of fat powder.

[0017] A dynamic oxidation protection system suitable for the method described above, the system being a dedicated assembly integrating functions to achieve regeneration and maintenance of media protection performance, comprising:

[0018] A spray cooling tower is equipped with an atomizer, a nitrogen inlet, and an outlet;

[0019] A nitrogen supply and cooling unit is connected to the nitrogen inlet;

[0020] The recovery and purification unit is connected to the nitrogen outlet and is integrated in the order of dust separation, deep dehumidification to dew point ≤40℃, and precision filtration.

[0021] The circulation conveying and intelligent control unit is connected to the outlet of the recovery and purification unit and the inlet of the nitrogen supply and cooling unit to form a closed loop; the intelligent control unit is configured to maintain the product peroxide value as the core objective, and automatically control the nitrogen replenishment, venting and circulation status through sensor feedback.

[0022] The circulating conveying and intelligent control unit connects the outlet of the recycling and purification unit to the inlet of the nitrogen supply and cooling unit, forming a closed loop. The intelligent control unit includes a sensor group, a controller, and an actuator. Its control logic focuses on suppressing the concentration of moisture and impurities in the circulating nitrogen to below the threshold that ensures the product's peroxide value meets the standard, and automatically adjusts the system operation accordingly.

[0023] Furthermore, the deep dehumidification module in the recycling and purification unit is an adsorption dryer, and its outlet is equipped with a dew point sensor, the sensor signal of which is connected to the intelligent control unit.

[0024] Furthermore, the intelligent control unit includes a controller whose algorithm includes a model that predicts the peroxide value trend of the product based on real-time dew point and oxygen content data, and adjusts the regeneration frequency of the deep dehumidification module or the system vent valve according to the prediction results.

[0025] The system forms a closed loop, and its nitrogen recycling rate is not less than 95% during normal operation.

[0026] Compared with the prior art, the dynamic oxidation protection system and method based on nitrogen medium circulation in the production process of fat powder provided by the present invention has the following beneficial effects:

[0027] Nitrogen, as a cooling medium, isolates oxygen at the source and, in conjunction with a closed-loop circulation, maintains an inert environment, reducing the peroxide value of the product by more than 60% compared to air cooling processes, resulting in a significant improvement in product quality.

[0028] Targeted deep purification ensures that the quality of nitrogen does not decline during circulation, making the nitrogen recycling rate stable at ≥95%, thus solving the cost bottleneck of inert gas application in production.

[0029] The synergistic effect of deep dehumidification (dew point ≤40℃) and low-temperature cooling unexpectedly and completely solved the industry problem of high-melting-point fat powder being prone to moisture absorption and clumping, thus improving product flowability.

[0030] The purification sequence and control strategy, specifically designed for fat powder production, overcome the damage to the general circulation system caused by grease dust and high humidity load, ensuring long-term operational reliability. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0032] Figure 1 A schematic diagram of a dynamic oxidation protection system based on nitrogen medium circulation in the fat powder production process provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a dynamic oxidation protection method based on nitrogen medium circulation during the fat powder production process provided in an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Spray cooling tower; 2. Nitrogen supply and cooling unit; 3. Recovery and purification unit; 4. Circulation conveying and intelligent control unit. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] like Figure 1 As shown, in actual operation, the system works as follows: molten fat is atomized by an atomizer at the top of the spray cooling tower 1. Low-temperature nitrogen (e.g., 8°C) supplied by the nitrogen supply and cooling unit 2 enters from the side of the tower for cooling and protection. The nitrogen carrying fine powder and moisture is discharged from the top of the tower and enters the recovery and purification unit 3. One of the key aspects of this invention lies in the configuration of the recovery and purification unit 3: it first removes most of the dust through a cyclone separator, and then the gas must pass through a specially selected adsorption dryer (deep dehumidification module), whose outlet dew point is set and stabilized at -45°C to meet the process requirement of ≤40°C. This deep dehumidification step is crucial for maintaining the long-term protective capability of the nitrogen and preventing moisture accumulation within the system. Finally, the gas is purified by a high-efficiency filter.

[0037] The purified nitrogen enters the circulation and intelligent control unit 4. The core controller of this unit continuously monitors dew point and oxygen content sensor data. When model calculations indicate that current parameter trends may affect the product's peroxide value, the controller prioritizes adjusting the dryer's regeneration cycle or fine-tuning the vent valve, rather than simply replenishing with new nitrogen. This preventative control strategy, aimed at improving the final product quality, is key to achieving efficient nitrogen circulation (measured utilization rate of 97.5%) and system stability.

[0038] Example:

[0039] A dynamic oxidation protection method based on nitrogen medium circulation during fat powder production includes the following steps:

[0040] S1. Introduce nitrogen gas cooled to 5-15°C into the fat powder spray cooling tower 1, and set the dew point control target of the circulating nitrogen gas to ≤40°C.

[0041] S2. The cooling nitrogen gas comes into contact with the atomized fat droplets inside the tower to cool them and isolate them from dynamic oxygen, while also carrying away fine powder and moisture.

[0042] S3. The nitrogen gas after being loaded with dirt is sequentially subjected to dust separation, deep dehumidification treatment to dew point ≤40℃ and precision filtration.

[0043] S4. The purified nitrogen is returned to the cooling step for recycling, and the circulation parameters are monitored in real time to dynamically adjust the system operation with the goal of keeping the product peroxide value below the preset threshold.

[0044] In step S1, the nitrogen cooling temperature and dew point control target are set in a coordinated manner to simultaneously optimize cooling efficiency, prevent product moisture absorption, and control condensation within the control system.

[0045] In step S3, the deep dehumidification treatment adopts an adsorption drying method, and the selection of adsorbent and regeneration cycle are optimized for the oil aerosol and moisture mixed pollutants generated in the production of fat powder.

[0046] A dynamic oxidation protection system suitable for a method, the system being a dedicated assembly integrating functions to achieve regeneration and maintenance of media protection performance, comprising:

[0047] Spray cooling tower 1, which is equipped with an atomizer, a nitrogen inlet and an outlet;

[0048] Nitrogen supply and cooling unit 2 is connected to the nitrogen inlet;

[0049] The recovery and purification unit 3 is connected to the nitrogen outlet and is set up in an integrated manner in the order of dust separation, deep dehumidification to dew point ≤40℃, and precision filtration.

[0050] The circulation conveying and intelligent control unit 4 is connected to the outlet of the recovery and purification unit 3 and the inlet of the nitrogen supply and cooling unit 2 to form a closed loop; the intelligent control unit is configured to maintain the product peroxide value as the core objective, and automatically control the nitrogen replenishment, venting and circulation status through sensor feedback.

[0051] The deep dehumidification module in the recycling and purification unit 3 is an adsorption dryer, and its outlet is equipped with a dew point sensor, the signal of which is connected to the intelligent control unit.

[0052] The circulating conveying and intelligent control unit 4 includes a controller whose algorithm includes a model that predicts the peroxide value trend of the product based on real-time dew point and oxygen content data, and adjusts the regeneration frequency of the deep dehumidification module or the system vent valve according to the prediction results.

[0053] The system forms a closed loop, and its nitrogen recycling rate is no less than 95% during normal operation.

[0054] Application example:

[0055] This system was applied in a stearic acid fatty acid powder production line. The peroxide value of the traditional air-cooled product was 5.2 meq / kg. After adopting this system:

[0056] The product's peroxide value remains stable below 1.8 meq / kg.

[0057] The system maintains a nitrogen dew point between -42°C and -45°C, with an average recycling rate of 97.5%.

[0058] After running continuously for a month, no system performance degradation occurred due to grease adhesion or humidity, proving its unique adaptability to the production conditions of fat powder.

[0059] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A dynamic oxidation protection method based on nitrogen medium circulation in a fat powder production process, characterized in that, Includes the following steps: S1. Introduce nitrogen gas cooled to 5-15°C into the fat powder spray cooling tower, and set the dew point control target of the circulating nitrogen gas to ≤40°C. S2. The cooling nitrogen gas is brought into contact with the atomized fat droplets inside the tower to cool and isolate them from dynamic oxygen, and to carry out fine powder and moisture. S3. The nitrogen gas after being loaded with dirt is sequentially subjected to dust separation, deep dehumidification treatment to a dew point ≤40℃, and precision filtration. S4. The purified nitrogen is returned to the cooling step for recycling, and the circulation parameters are monitored in real time to dynamically adjust the system operation with the goal of keeping the product peroxide value below the preset threshold.

2. The dynamic oxidation protection method based on nitrogen medium circulation in the production process of fat powder according to claim 1, characterized in that, In step S1, the nitrogen cooling temperature is set in conjunction with the dew point control target to simultaneously optimize cooling efficiency, prevent product moisture absorption, and control condensation within the control system.

3. The dynamic oxidation protection method based on nitrogen medium circulation in the production process of fat powder according to claim 1, characterized in that, The deep dehumidification treatment in step S3 adopts an adsorption drying method, and the selection of adsorbent and regeneration cycle are optimized for the oil aerosol and water mixed pollutants generated in the production of fat powder.

4. A dynamic oxidation protection system applicable to the method according to any one of claims 1-3, characterized in that, The system is a dedicated assembly that integrates functions to achieve regeneration and maintenance of media protection performance, including: A spray cooling tower (1) is provided with an atomizer, a nitrogen inlet and an outlet; Nitrogen supply and cooling unit (2) is connected to the nitrogen inlet; The recovery and purification unit (3) is connected to the nitrogen outlet and is integrated in the order of dust separation, deep dehumidification to dew point ≤40℃ and precision filtration. The circulation conveying and intelligent control unit (4) is connected to the outlet of the recovery and purification unit (3) and the inlet of the nitrogen supply and cooling unit (2) to form a closed loop; the intelligent control unit is configured to automatically control the nitrogen replenishment, venting and circulation status through sensor feedback with the core objective of maintaining the product peroxide value to meet the standard.

5. The dynamic oxidation protection system according to claim 4, characterized in that, The deep dehumidification module in the recycling and purification unit (3) is an adsorption dryer, and its outlet is equipped with a dew point sensor, the sensor signal of which is connected to the intelligent control unit.

6. The dynamic oxidation protection system according to claim 4, characterized in that, The intelligent control unit (4) includes a controller whose algorithm includes a model that predicts the peroxide value trend of the product based on real-time dew point and oxygen content data, and adjusts the regeneration frequency of the deep dehumidification module or the system vent valve according to the prediction results.

7. The system according to any one of claims 4 to 6, characterized in that, The system forms a closed loop, and its nitrogen recycling rate is not less than 95% during normal operation.

Images