CN218943930U - Spirulina slurry sterilizing and drying system based on low-temperature plasma technology - Google Patents
Spirulina slurry sterilizing and drying system based on low-temperature plasma technology Download PDFInfo
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- CN218943930U CN218943930U CN202222772231.7U CN202222772231U CN218943930U CN 218943930 U CN218943930 U CN 218943930U CN 202222772231 U CN202222772231 U CN 202222772231U CN 218943930 U CN218943930 U CN 218943930U
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Abstract
The utility model provides a spirulina pulp sterilization and drying system based on a low-temperature plasma technology, which belongs to the technical field of microalgae product processing and comprises an air compressor, a plasma generating device, a plasma jet head, a microalgae sterilization tank body, a microalgae discharging device, a microalgae feeding device, a first adjustable pump, a second adjustable pump, a detection sampling device and a tail gas collecting and processing device. The system is simple to operate and high in sterilization efficiency, and solves the problems that consumers worry about irradiation sterilization and other sterilization methods are high in energy consumption. The plasma jet with larger flow plays a role in drying while sterilizing at low temperature, so that the time consumption of the microalgae processing and production process is greatly shortened, the loss of the microalgae thermosensitive nutrient substances is reduced, and the product quality is improved.
Description
Technical Field
The utility model relates to the technical field of microalgae product processing, in particular to a spirulina pulp sterilization and drying system based on a low-temperature plasma technology.
Background
The spirulina and the extract thereof have a series of physiological functions of resisting oxidation, resisting inflammation, resisting tumor, improving immunity, preventing fatty liver and the like in the aspect of maintaining human health, so that the spirulina has great market potential in the fields of food, biology and medicine. Due to the rich nutrition of the spirulina and the recycling of the culture solution, the spirulina culture solution becomes a place for the growth and propagation of microorganisms such as bacteria, saccharomycetes and mold, and the basic process of production can not be ensured to be not polluted by the microorganisms, so that the total number of the dry powder colony of the spirulina is up to (4-5) multiplied by 10 4 cfu/g far exceeds the national standard (less than or equal to 1 multiplied by 10) of edible spirulina powder 4 cfu/g), the development and application of spirulina in food and biology and the external outlet of spirulina dry powder are seriously affected, and the economic development of the field is limited.
Phycocyanin in spirulina is a heat-sensitive substance, the content of which is obviously reduced after the temperature is higher than 60 ℃, and the temperature is a main factor of degradation. The main sterilization methods and the characteristics thereof for the thermosensitive substances at home and abroad are shown in the table 1, and the sterilization methods are low in efficiency, easy to have potential safety hazards and high in loss of thermosensitive nutrients for microalgae.
TABLE 1 Main Sterilization method for thermosensitive substances at home and abroad
Disclosure of Invention
Aiming at the defects and the problems in the prior art, the utility model aims to provide a spirulina slurry sterilizing and drying system based on a low-temperature plasma technology, which is efficient, quick, high in safety and low in energy consumption.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a spirulina slurry sterilizing and drying system based on a low-temperature plasma technology comprises an air compressor, a plasma generating device, a plasma jet head, a microalgae sterilizing tank body, a microalgae discharging device, a microalgae feeding device, a first adjustable pump, a second adjustable pump, a detection sampling device and a tail gas collecting and processing device;
the device comprises an air compressor, a plasma generating device and a plasma jet head, wherein the air compressor, the plasma generating device and the plasma jet head are sequentially communicated through pipelines, the plasma jet head is embedded into one side of the top of a microalgae sterilizing tank body and is obliquely arranged, one side of the microalgae sterilizing tank body is communicated with a microalgae discharging device through a pipeline, a second adjustable pump is arranged on the pipeline between the microalgae sterilizing tank body and the microalgae discharging device, a first three-way valve is arranged on the pipeline between the second adjustable pump and the microalgae discharging device, one side of the microalgae discharging device is provided with a microalgae feeding device, the microalgae feeding device is communicated to the top center of the microalgae sterilizing tank body through a pipeline, a first adjustable pump is arranged on the pipeline between the microalgae feeding device and the microalgae sterilizing tank body, a second three-way valve is arranged on the pipeline between the second three-way valve and the first three-way valve, a third three-way valve is arranged on the pipeline between the first adjustable pump and the microalgae discharging device, the other end of the third three-way valve is communicated to the top of the microalgae sterilizing tank body through a pipeline detection device, and the other side of the microalgae discharging device is communicated to the air collecting device through a sampling device.
Further, an air inlet is formed in one side of the air compressor.
Further, a stirring paddle is arranged at the center of the bottom of the microalgae sterilizing tank body.
Further, a temperature detector is arranged on the side face of the microalgae sterilization tank body, a temperature probe is arranged on the inner side of the microalgae sterilization tank body, and the temperature detector is electrically connected with the temperature probe.
Further, the top of the microalgae sterilizing tank body, the microalgae discharging device and the detecting and sampling device are respectively provided with a first air filter screen, a second air filter screen and a third air filter screen at the end part of a pipeline communicated with the tail gas collecting and processing device.
Further, the inclination angle of the plasma jet head is adjustable.
Compared with the prior art, the utility model has the beneficial effects that:
according to the utility model, the active particles in the plasma jet flow at low temperature are utilized to kill microorganisms, the spray drying time is shortened by the plasma flow, the heat loss is reduced, the drying efficiency is improved, the algae mud treatment time is prolonged by the circulating operation, the contact time with hot air is prolonged, the drying efficiency is improved, the sample uniform treatment is realized by the circulating operation and sample stirring, meanwhile, the local scorching phenomenon existing in the microwave drying or irradiation drying process is avoided, and the quality of algae products is effectively ensured. The device has the advantages of continuity, rapidness, low energy consumption, reasonable process, wide application range and the like, and is ideal drying and sterilizing equipment for heat-sensitive and easily-oxidized materials.
The utility model has stable operation, simple structure, convenient operation and use and controllable temperature, can realize dynamic circulation high-speed drying treatment, simultaneously achieves sterilization effect and meets the actual production requirement.
Drawings
FIG. 1 is a schematic diagram of the system of the present utility model.
Illustration of: 1. an air inlet; 2. an air compressor; 3. a plasma generating device; 4. a tail gas collection and treatment device; 5. a plasma jet head; 6. a temperature detector; 7. a temperature probe; 8. a microalgae sterilization tank; 9. stirring paddles; 10. a first air filter screen; 11. a discharge pipe; 12. a feed conduit; 13. a first three-way valve; 14. a second air filter screen; 15. a third three-way valve; 16. a microalgae discharging device; 17. a third air filter screen; 18. detecting a sampling device; 19. a second three-way valve; 20. microalgae feeding device; 21. a first adjustable pump; 22. a second adjustable pump.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. The specific embodiments described herein are only for the purpose of illustrating the technical solution of the present utility model and are not to be construed as limiting the utility model.
As shown in fig. 1, a spirulina slurry sterilizing and drying system based on low-temperature plasma technology comprises an air compressor 2, a plasma generating device 3, a plasma jet head 5, a microalgae sterilizing tank 8, a microalgae discharging device 16, a microalgae feeding device 20, a first adjustable pump 21, a second adjustable pump 22, a detecting and sampling device 18 and a tail gas collecting and processing device 4.
An air inlet 1 is arranged on one side of the air compressor 2, a plasma generating device 3 and a plasma jet head 5 are sequentially communicated through a pipeline, the plasma jet head 5 is embedded and arranged on one side of the top of a microalgae sterilizing tank body 8 and is obliquely arranged, a stirring paddle 9 is arranged at the center of the bottom of the microalgae sterilizing tank body 8, a temperature detector 6 is arranged on the side surface of the microalgae sterilizing tank body 8, a temperature probe 7 is arranged on the inner side of the microalgae sterilizing tank body 8, the temperature detector 6 is electrically connected with the temperature probe 7, one side of the microalgae sterilizing tank body 8 is communicated with a microalgae discharging device 16 through a pipeline, a second adjustable pump 22 is arranged on the pipeline between the microalgae sterilizing tank body 8 and the microalgae discharging device 16, a first three-way valve 13 is arranged on the pipeline between the second adjustable pump 22 and the microalgae discharging device 16, a microalgae feeding device 20 is arranged on one side of the microalgae discharging device 16, the microalgae feeding device 20 is communicated to the center of the top of the microalgae sterilizing tank body 8 through the pipeline, the microalgae feeding device 20 is communicated with a third adjustable pump 19 through a three-way valve 21 and a three-way valve 18 on the top of the microalgae sterilizing tank body 8, the three-way valve 19 is arranged on the other side of the microalgae sterilizing tank body 16 through a pipeline between the first adjustable pump 21 and the three-way valve 19 and the microalgae discharging device 16, the three-way valve 19 is communicated with the three-way valve 19 through the pipeline between the first adjustable pump 15 and the three-way valve 15, and the three-way valve 18 is communicated with the three-way valve 15, the other side of the tail gas collecting and treating device 4 is communicated with the air compressor 2 through a pipeline. The top of the microalgae sterilizing tank body 8, the microalgae discharging device 16 and the detecting and sampling device 18 are respectively provided with a first air filter screen 10, a second air filter screen 14 and a third air filter screen 17 at the end parts of the pipeline communicated with the tail gas collecting and processing device 4.
The single operation pipeline of the whole system works as follows: after the air compressor 2, the plasma generating device 3 and the plasma jet head 5 stably run, microalgae slurry to be sterilized is added from the microalgae feeding device 20, the second three-way valve 19 is opened to communicate the microalgae feeding device 20 with the first adjustable pump 21, the first three-way valve 13 is opened to communicate the discharging pipeline 11 with the microalgae discharging device 16, the microalgae slurry is conveyed to the microalgae sterilizing tank 8 through the feeding pipeline 12 under the action of the first adjustable pump 21, is contacted and reacted with plasma jet flow jetted by the plasma jet head 5 at the end of the pipeline, is collected at the bottom of the microalgae sterilizing tank 8 under the action of gravity and the plasma jet flow, is fully and uniformly mixed by the stirring paddle 9, and then is collected into the microalgae discharging device 16 through the discharging pipeline 11 under the action of the second adjustable pump 22 until the sample treatment in the microalgae feeding device 20 is completed, and then single-operation work is completed.
The whole set of system circulation operation pipeline works as follows: after the air compressor 2, the plasma generating device 3 and the plasma jet head 5 stably run, microalgae slurry to be sterilized is added from the microalgae feeding device 20, the second three-way valve 19 is opened to communicate the microalgae feeding device 20 with the first adjustable pump 21, and the second adjustable pump 22 is closed, so that the microalgae slurry is conveyed to the microalgae sterilizing tank 8 through the feeding pipeline 12 under the action of the first adjustable pump 21. The microalgae slurry is in contact reaction with the plasma jet flow sprayed by the plasma spraying head 5 at the end of the pipeline, under the action of gravity and the plasma jet flow, after all microalgae samples are collected at the bottom of the microalgae sterilizing tank body 8, the microalgae samples are fully and uniformly mixed by the stirring paddle 9, the first three-way valve 13 is changed into a state of being communicated with the discharging pipeline 11 and the first adjustable pump 21, the second three-way valve 19 is changed into a state of being communicated with the discharging pipeline 11 and the first adjustable pump 21, the second adjustable pump 22 is opened, and the microalgae slurry is conveyed to the microalgae sterilizing tank body 8 through the feeding pipeline 12 under the action of the second adjustable pump 22 and the first adjustable pump 21, so that the microalgae slurry is circularly treated. If the circulation work is finished, the first adjustable pump 21 is turned off, and the microalgae slurry is collected through the discharging pipeline 11 and enters the microalgae discharging device 16 until the treatment is finished, so that the running work is finished.
The temperature detector 6 and the temperature probe 7 are used for monitoring the temperature of the microalgae slurry which is uniformly stirred in the microalgae sterilizing tank body 8 in the whole process, so that the working condition required by a sample is adjusted, and the low-temperature control of the sterilizing operation is realized. If sampling is needed for sample observation and monitoring during operation, the third three-way valve 15 can be opened to collect part of microalgae slurry sample to the detection sampling device 18. The tops of the microalgae sterilizing tank body 8, the microalgae discharging device 16 and the detecting and sampling device 18 are respectively provided with a first air filter screen 10, a second air filter screen 14 and a third air filter screen 17, and air is collected through the air filter screens and enters the tail gas collecting and processing device 4 to be uniformly processed, and is recycled to the air compressor 2 for recycling, and when the circulating air pressure is insufficient, the air compressor 2 can maintain the system to work through the air inlet 1. The whole gas passage maintains the pressure balance of each device and makes full use of active substances generated by the plasma device.
Preferably, the concentration of the microalgae slurry is 5% -25%.
Preferably, the power of the plasma generator 3 is 600 to 1000W.
Preferably, the plasma jet temperature is controlled to be 25-50 ℃.
Preferably, the working angle between the plasma jet head 5 and the sample discharging is adjustable.
The system has controllable circulation times, controllable speed, controllable flow and controllable temperature, and can perform parameter adjustment according to the concentration of microalgae slurry obtained each time, the volume of the microalgae slurry to be sterilized and the characteristics of microalgae samples with different initial colony counts so as to meet various sterilization requirements and technical standards in production and achieve sterilization high efficiency with minimum energy consumption.
Example 1:
according to the adjustable power range of the plasma generating device 3, 600W, 700W, 800W, 900W and 1000W power treatment is carried out on 200mL of spirulina slurry with the concentration of 15%, the bacteria content of the spirulina slurry is measured in the treatment of 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10min, and the sterilization effect under different time and power parameters is explored by comparing the initial bacteria content of the spirulina slurry.
The research shows that the sterilization rate is gradually increased along with the extension of the treatment power range of 600-1000W, and the sterilization effect of 1000W is obviously better than 600-900W. Except 600W, the sterilization rate of 90% or above can be achieved after the algae slurry with the power of 700-1000W is treated by low-temperature plasma for 10 min. The sterilization rate of the spirulina slurry reaches 99.9% in 1min after the spirulina slurry is treated under the power of 1000W. When the concentration of the algae slurry is 15%, the sample amount of the algae slurry is 200g, and after the algae slurry is treated for 10min at 600W, 700W, 800W, 900W and 1000W, the total colony count is finally reduced by 0.556 g, 1.951 g, 1.636 g, 7.760 g and 8.091 g CFU/g respectively.
The higher the treatment power in the plasma treatment, the more significant the weight reduction of spirulina slurry. The weight reduction was approximately 67g after 10min of 1000W power treatment, and the total sample was reduced by 33.5%. Therefore, the low-temperature plasma technology can not only effectively sterilize, but also be helpful for heating and drying spirulina slurry, so as to provide pretreatment for the subsequent process of spray drying into spirulina powder, improve the drying rate and shorten the drying time.
Example 2:
centrifuging the harvested spirulina slurry, reserving precipitated spirulina slurry, preparing 100mL of spirulina slurry with the recovery liquid, namely 5%, 10%, 15%, 20% and 25% of the spirulina slurry by mass fraction, treating for 5min with 800W plasma power, and observing the influence of the concentration of the spirulina slurry on the sterilization efficiency in low-temperature plasma sterilization.
The implementation result shows that the sterilization effect of the spirulina slurry is in the range of 5-20% by mass, the higher the concentration of the spirulina slurry is, the better the sterilization effect is, but when the mass fraction of the spirulina slurry is increased to 25%, the sterilization effect is poorer under the same treatment condition. Under the same treatment power and treatment duration conditions, the degree of weight reduction is inversely proportional to the mass fraction of the algae slurry, namely is directly proportional to the water content of the algae slurry, and the higher the water content of the spirulina slurry is, the more water is evaporated. Therefore, when the low-temperature plasma is utilized to sterilize the turbid sample, proper technological parameters should be selected, and nutrition is reserved as much as possible while the sterilization effect is ensured.
Example 3:
respectively taking 20, 50, 100, 200 and 500mL of spirulina slurry with the mass fraction of 15%, placing the spirulina slurry into a round bottom beaker with the same bottom area, sealing a film cover, treating the spirulina slurry with 800W plasma power for 5min, and observing the influence of the sample volume on the sterilization efficiency in low-temperature plasma sterilization.
The volume of the algae slurry is 50-200mL, the algae slurry has a sterilization effect after being treated for 5min by 800W, the sterilization rate is 10-25%, and the sterilization effect is optimal when the volume of a 500mL sample is 500mL, and the sterilization rate is up to 63%. Under the same low temperature plasma treatment conditions, the total moisture content of the sample is positively correlated with the weight reduction before and after the treatment, i.e., the higher the total moisture content, the more moisture evaporates. The temperature rise of the algae slurry is positively correlated with the treatment volume and the water content.
The foregoing description of the preferred embodiments of the present utility model has been presented only in terms of those specific and detailed descriptions, and is not, therefore, to be construed as limiting the scope of the utility model. It should be noted that modifications, improvements and substitutions can be made by those skilled in the art without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (6)
1. A spirulina thick liquid sterilization drying system based on low temperature plasma technique, its characterized in that: the device comprises an air compressor (2), a plasma generating device (3), a plasma jet head (5), a microalgae sterilizing tank body (8), a microalgae discharging device (16), a microalgae feeding device (20), a first adjustable pump (21), a second adjustable pump (22), a detecting and sampling device (18) and a tail gas collecting and processing device (4);
the utility model discloses a microalgae sterilizing tank, which is characterized in that an air compressor (2), a plasma generating device (3) and a plasma jet head (5) are sequentially communicated through pipelines, the plasma jet head (5) is embedded and arranged at one side of the top of the microalgae sterilizing tank (8) and is obliquely arranged, one side of the microalgae sterilizing tank (8) is communicated with a microalgae discharging device (16) through the pipelines, a second adjustable pump (22) is arranged on the pipeline between the microalgae sterilizing tank (8) and the microalgae discharging device (16), a first three-way valve (13) is arranged on the pipeline between the second adjustable pump (22) and the microalgae discharging device (16), a microalgae feeding device (20) is arranged at one side of the microalgae discharging device (16), the microalgae feeding device (20) is communicated to the top center of the microalgae sterilizing tank (8) through the pipeline, a first adjustable pump (21) is arranged on the pipeline between the microalgae feeding device (20) and the microalgae sterilizing tank (8), a third three-way valve (19) is arranged on the pipeline between the first adjustable pump (21) and the microalgae feeding device (20) and the third three-way valve (19), the other end of the third three-way valve (15) is communicated with a detection sampling device (18) through a pipeline, one side of the tail gas collection and treatment device (4) is respectively communicated to the tops of the microalgae sterilization tank body (8), the microalgae discharging device (16) and the detection sampling device (18) through pipelines, and the other side of the tail gas collection and treatment device (4) is communicated to the air compressor (2) through a pipeline.
2. The spirulina slurry sterilization and drying system based on the low-temperature plasma technology according to claim 1, wherein: an air inlet (1) is arranged on one side of the air compressor (2).
3. The spirulina slurry sterilization and drying system based on the low-temperature plasma technology according to claim 1, wherein: the center of the bottom of the microalgae sterilization tank body (8) is provided with a stirring paddle (9).
4. The spirulina slurry sterilization and drying system based on the low-temperature plasma technology according to claim 1, wherein: the side of the microalgae sterilization tank body (8) is provided with a temperature detector (6), the inner side of the microalgae sterilization tank body (8) is provided with a temperature probe (7), and the temperature detector (6) is electrically connected with the temperature probe (7).
5. The spirulina slurry sterilization and drying system based on the low-temperature plasma technology according to claim 1, wherein: the microalgae sterilizing tank body (8), the microalgae discharging device (16) and the pipeline end parts, communicated with the tail gas collecting and treating device (4), of the top of the detecting and sampling device (18) are respectively provided with a first air filter screen (10), a second air filter screen (14) and a third air filter screen (17).
6. The spirulina slurry sterilization and drying system based on the low-temperature plasma technology according to claim 1, wherein: the inclination angle of the plasma jet head (5) is adjustable.
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| CN202222772231.7U CN218943930U (en) | 2022-10-20 | 2022-10-20 | Spirulina slurry sterilizing and drying system based on low-temperature plasma technology |
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| CN202222772231.7U CN218943930U (en) | 2022-10-20 | 2022-10-20 | Spirulina slurry sterilizing and drying system based on low-temperature plasma technology |
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