CN-122006273-A - Efficient spray drying process for plant extracts

CN122006273ACN 122006273 ACN122006273 ACN 122006273ACN-122006273-A

Abstract

The invention relates to the technical field of control systems of non-electric variables, in particular to a high-efficiency spray drying process for plant extracts, which comprises the steps of correcting wet bulb temperature according to real-time atomization pressure of a tower top, determining real-time wet bulb temperature correction value, determining real-time tower top temperature difference value by combining the initial Tg value, performing closed-loop control on air inlet temperature of a tower top constant-speed drying zone, determining real-time water content in the tower according to the difference between real-time actually measured water content detection value and water content estimated value of materials, acquiring real-time Tg value corresponding to the water content in the tower, determining real-time speed reduction curing zone temperature difference value by combining real-time speed reduction curing zone material temperature, and performing closed-loop control on air inlet temperature of a tower bottom speed reduction curing zone. The invention has the advantages of high production stability, lower energy consumption and improved product quality through the self-adaptive control of the high-efficiency spray drying process.

Inventors

HOU YINJUN
GAO HONGMEI
REN TING
LI HUI
GAO QIAN

Assignees

陕西昂盛生物医药科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. A high efficiency spray drying process for plant extracts, characterized in that the process comprises the steps of: obtaining an initial Tg value of the plant extract; Acquiring real-time air inlet temperature, air inlet humidity and atomization pressure of the tower top, acquiring wet bulb temperature corresponding to the air inlet temperature and the air inlet humidity, correcting the wet bulb temperature according to the atomization pressure, determining a real-time wet bulb temperature correction value, determining a real-time tower top temperature difference value according to the wet bulb temperature correction value and the initial Tg value, and performing closed-loop control on the air inlet temperature of a constant-speed drying area of the tower top according to the tower top temperature difference value; The method comprises the steps of obtaining a real-time actually measured water content detection value and a water content presumption value of materials, determining real-time water content in a tower according to the difference between the actually measured water content detection value of the materials and the water content presumption value, obtaining a real-time Tg value corresponding to the water content in the tower, obtaining real-time temperature in the tower and tower bottom air outlet temperature, adjusting the difference between the temperature in the tower and the tower bottom air outlet temperature by using the water content in the tower, determining real-time material temperature of a speed-down curing zone by combining the tower bottom air outlet temperature, determining a real-time temperature difference value of the speed-down curing zone according to the material temperature of the speed-down curing zone and the real-time Tg value, and performing closed-loop control on the air inlet temperature of a speed-down curing zone in the tower according to the temperature difference value of the speed-down curing zone.
2. The efficient spray-drying process for plant extracts according to claim 1, wherein said determining real-time wet bulb temperature correction values comprises the specific steps of: If the atomization pressure is greater than a preset pressure threshold, compensating the wet bulb temperature according to the excess of the atomization pressure exceeding the preset pressure threshold to obtain a real-time wet bulb temperature correction value; if the atomization pressure is smaller than or equal to a preset pressure threshold, enabling the real-time wet bulb temperature correction value to be equal to the wet bulb temperature.
3. The efficient spray-drying process for plant extracts according to claim 2, wherein the compensating the wet bulb temperature according to the excess of the atomizing pressure beyond a preset pressure threshold value, obtaining a real-time wet bulb temperature correction value, comprises the specific steps of: Calculating a difference value of the atomization pressure minus a preset pressure threshold value, multiplying the difference value by a preset correction coefficient to obtain a compensation item, and recording the result obtained by subtracting the compensation item from the wet bulb temperature as a real-time wet bulb temperature correction value.
4. The efficient spray drying process for plant extracts according to claim 1, wherein said determining the real-time overhead temperature difference comprises the specific steps of: Subtracting a preset tower top safety threshold value from the initial Tg value, and recording the difference as a real-time tower top target temperature; and subtracting the difference value of the target temperature of the tower top from the real-time wet bulb temperature correction value, and recording the difference value as a real-time tower top temperature difference value.
5. A high efficiency spray drying process for plant extracts according to claim 1, wherein said determining the moisture content in the tower in real time comprises the specific steps of: determining a real-time water content deviation according to the difference between the actually measured water content detection value and the water content presumption value of the material; if the real-time water content deviation is smaller than or equal to a preset deviation threshold value, enabling the water content in the real-time tower to be equal to the water content estimated value; If the real-time water content deviation is larger than a preset deviation threshold, determining the real-time water content in the tower according to the actually measured water content detection value of the material and the water content presumption value.
6. The efficient spray-drying process for plant extracts according to claim 5, wherein said determining the real-time moisture deviation comprises the specific steps of: calculating the absolute value of the difference between the actually measured water content detection value of the material and the water content presumption value, calculating the ratio of the absolute value of the difference to the actually measured water content detection value of the material, converting the ratio into a percentage form, and recording the percentage form as real-time water content deviation.
7. The efficient spray-drying process for plant extracts according to claim 5, wherein said determining the moisture content in the tower in real time based on the measured moisture content of said material and the estimated moisture content comprises the specific steps of: Calculating the ratio of the measured water content detection value of the material corresponding to the last sampling time to the water content estimated value, and recording the product of the ratio and the real-time water content estimated value as the real-time water content in the tower.
8. A high efficiency spray drying process for plant extracts as defined in claim 1, wherein said determining the real time reduced speed cure zone material temperature comprises the specific steps of: And calculating the difference value of the temperature in the tower minus the temperature of the air outlet at the bottom of the tower, calculating the product of the normalized value of the water content in the tower and the difference value, and recording the sum of the product and the temperature of the air outlet at the bottom of the tower as the real-time material temperature of the speed-down curing zone.
9. A high efficiency spray drying process for plant extracts according to claim 1, wherein said determining the real time reduced speed cure zone temperature differential comprises the specific steps of: Determining a target temperature of a real-time deceleration curing zone according to the magnitude of the real-time Tg value; and (3) subtracting the target temperature of the deceleration curing zone from the material temperature of the deceleration curing zone, and recording the difference as a real-time temperature difference of the deceleration curing zone.
10. A high efficiency spray drying process for plant extracts as defined in claim 9, wherein said determining a real time reduced speed cure zone target temperature comprises the specific steps of: And subtracting a safety threshold value in a preset tower from the real-time Tg value, and recording the difference as a real-time target temperature of the deceleration solidification zone.

Description

Efficient spray drying process for plant extracts Technical Field The invention relates to the technical field of non-electric variable control systems, in particular to a high-efficiency spray drying process for plant extracts. Background The plant extract is used as a core raw material in the fields of food, medicine, cosmetics and the like, the global market scale is continuously expanded, and spray drying is a main process for powdering the plant extract due to efficient, continuous and adaptive mass production. However, the plant extract compound has low Tg (Glass Transition Temperature ) and dynamic changes along with components and moisture due to low molecular components such as polysaccharide, polyphenol and the like, and is extremely easy to cause caking problems due to material softening and wall sticking in the spray drying process, so that the product yield is low and the quality is uneven, and the plant extract compound becomes a key bottleneck for restricting the efficient production of industries. The existing problems are that the traditional plant extract spray drying process mostly adopts the parameter combination of fixed air inlet temperature, atomization pressure and feeding rate, and relies on adding carriers such as maltodextrin, starch and the like to raise the Tg of the material so as to improve the drying characteristic. The process does not carry out matching regulation and control on the dynamic change characteristics of Tg of the plant extract, materials easily enter a viscous state due to temperature and moisture fluctuation in the drying process, wall sticking and particle agglomeration in a tower are caused, the product yield is reduced, poor powder fluidity and low solubility are caused, and the excessive carrier addition can dilute effective components, so that the drying requirement of the high-purity and high-quality plant extract is difficult to meet. Disclosure of Invention The present invention provides a highly efficient spray drying process for plant extracts to solve the existing problems. The invention relates to a high-efficiency spray drying process for plant extracts, which adopts the following technical scheme: one embodiment of the present invention provides a high efficiency spray drying process for plant extracts, the process comprising the steps of: obtaining an initial Tg value of the plant extract; Acquiring real-time air inlet temperature, air inlet humidity and atomization pressure of the tower top, acquiring wet bulb temperature corresponding to the air inlet temperature and the air inlet humidity, correcting the wet bulb temperature according to the atomization pressure, determining a real-time wet bulb temperature correction value, determining a real-time tower top temperature difference value according to the wet bulb temperature correction value and the initial Tg value, and performing closed-loop control on the air inlet temperature of a constant-speed drying area of the tower top according to the tower top temperature difference value; The method comprises the steps of obtaining a real-time actually measured water content detection value and a water content presumption value of materials, determining real-time water content in a tower according to the difference between the actually measured water content detection value of the materials and the water content presumption value, obtaining a real-time Tg value corresponding to the water content in the tower, obtaining real-time temperature in the tower and tower bottom air outlet temperature, adjusting the difference between the temperature in the tower and the tower bottom air outlet temperature by using the water content in the tower, determining real-time material temperature of a speed-down curing zone by combining the tower bottom air outlet temperature, determining a real-time temperature difference value of the speed-down curing zone according to the material temperature of the speed-down curing zone and the real-time Tg value, and performing closed-loop control on the air inlet temperature of a speed-down curing zone in the tower according to the temperature difference value of the speed-down curing zone. Further, the determining the real-time wet bulb temperature correction value comprises the following specific steps: If the atomization pressure is greater than a preset pressure threshold, compensating the wet bulb temperature according to the excess of the atomization pressure exceeding the preset pressure threshold to obtain a real-time wet bulb temperature correction value; if the atomization pressure is smaller than or equal to a preset pressure threshold, enabling the real-time wet bulb temperature correction value to be equal to the wet bulb temperature. Further, the wet bulb temperature is compensated according to the excess of the atomization pressure exceeding the preset pressure threshold value, and a real-time wet bulb temperature correction value is obtained, which comprises