Method and apparatus for atomizing, freezing and drying for powder production by using low-temperature low-dew point gas

A technology of spray freeze drying and low dew point, which is applied in the direction of drying solid materials, heating to dry solid materials, and non-heating to dry solid materials, etc., to achieve the effect of shortening drying time and reducing production costs

Inactive Publication Date: 2009-04-08
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY +1
View PDF3 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the shortcomings in the prior art that liquid nitrogen or liquid carbon dioxide needs to be freeze-dried and then pulverized after drying, the present invention provides a method and device for making powder by using low-temperature low-dew-point gas spray freeze-drying, using low-temperature low-dew-point The gas does not need to use liquid nitrogen or liquid carbon dioxide to directly make the liquid to be dried into ice powder, and then heat up and dry to obtain the finished dry powder

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for atomizing, freezing and drying for powder production by using low-temperature low-dew point gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]A spray freezing powder making and combined drying device for milk powder drying, 750g of skimmed milk powder suspension with a solid content of 30%, is atomized to 1-120 microns in a container with a fluidized bed by a two-fluid atomizer At the same time, the mist droplets are in contact with the low-temperature and low-humidity gas with a temperature of -65°C and a dew point of -70°C, and are rapidly cooled into ice milk powder. After 30 minutes, the powder making process is completed and enters the sublimation drying stage. The dehumidified gas at -20°C is used Fluidize the ice milk powder for 480 minutes, start the gas temperature to 0°C, run for 30 minutes, then raise the temperature to 30°C, continue to patrol for 45 minutes, end the whole drying process, take out the dried milk powder, the particle size is 1-120 microns, the residual water content 5.2%, the protein content is basically the same as the original.

Embodiment 2

[0029] A method for preparing cherry powder with spray freeze combined drying, the solid content is 10% 800g cherry liquid is atomized into fine droplets with a two-fluid atomizer, and the pressure of the compressed air used for atomization is 0.35MPa. It is frozen into cherry ice powder in the low-temperature air at -70°C. After 50 minutes, the ice powder is completed. Then the drying temperature is -28°C, and it runs for 500 minutes. Then it starts to heat up and dry. Now it is dried at -10°C for 30 minutes, and then dried at 5°C. 60 minutes, and finally dried at 35° C. for 45 minutes to end the whole process. The moisture content of the obtained cherry powder is 6.5%, and the particle size is 2-220 microns.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for milling by low temperature low dew point gas spray freeze drying which uses an atomizer for nebulizing liquid to be dried into 1 to 250 micron droplets which are frozen into ice powder in the gas with the low temperature of -60 DEG C and the dew point of -70 to -80 DEG C, then air-intake temperature is adjusted to 2 to 4 DEG C lower than the eutectic temperature of materials, the gas passes through a pore plate of a fluidized bed to lead the ice powder which stays on the fluidized plate to be fluidized, and simultaneously the solvent in the ice powder is sublimated. The sublimation drying process is completed until the dew point of the gas at the gas vent returns to -55 to -60 DEG C. The ice powder is dried for 1 to 2 hours into powder products when the temperature is increased to 30 to 50 DEG C. The gas coming out of the gas vent returns to the place for low temperature low dew point gas preparation for recirculation. The method is characterized by easy operation, continuous duty, and the like, and is especially suitable for the drying of materials such as medicine, food, biochemical product, and the like, guarantees the quality of products and can directly obtain the dried powder products; simultaneously the drying time of the method is greatly shortened compared with the vacuum freeze drying.

Description

technical field [0001] The invention relates to a method and a device for dry powder making, in particular to a method and a device for directly drying a solid-containing solvent or suspension to make powder. Background technique [0002] At present, the main method used in the technical field of spray freezing powder production is to directly use liquid nitrogen or liquid carbon dioxide, and utilize the ultra-low temperature of the above two low-temperature fluids to obtain low-temperature ice powder. However, when liquid nitrogen or liquid carbon dioxide is directly used, the temperature of the gas is difficult to keep constant, and at the same time, because they cannot be recycled, the resources of the above two fluids are wasted, which greatly increases the cost of the unit of use. The ice powder made must be completed in a vacuum freeze dryer, and the vacuum freeze drying takes a long time and consumes a lot of energy. The dried product needs to be pulverized and the po...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): F26B3/08F26B17/10F26B5/06
Inventor 黄立新周瑞君张建岗
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap