Liu Bo Xu Weimin of Jiangxi chemical aseptic processing of compressed air (Jiangxi Chemical Industry Design Institute of Nanchang using air as the oxygen source. Because the air contains various microorganisms, so in real life, to purify the air. Combining with the engineering example, discusses several key process should be paid attention to in the process of compressed air purification.
The relative temperature filling rate of either fermented food fermentation or drugs, the bacteria need oxygen in reproduction, and industrial production is often used in the air as the oxygen source. We know that the air contains every kind of microorganism, once these substances (microbial) with air into the fermentation tank and into the culture medium, in certain conditions, will be a lot of breeding and consume large amounts of nutrients and oxygen, the waste generated by the interference and even destroy the whole fermentation process is normal, the the yield of the product is reduced, even completely destroyed the fermentation process. Therefore, the air sterilization has become an important link of oxygen consumption in fermentation engineering, it is key to the success of the whole process.
In food, medicine and fermentation engineering, many methods of air sterilization, such as filtration, electrostatic sterilization, heat sterilization, but all methods bactericidal effect, equipment condition, economic indicators are not the same, we should not only avoid the contamination, but also simplify the sterilization process, to reduce the investment in equipment and power operation of consumption. Therefore, this paper is a discussion about the process of filtration.
The technical requirements of the air quality we know, various in fermentation engineering products with different strains. Growth and survival ability of the strain is different, it depends on the atmospheric environment, fermentation cycle, culture composition and pH difference solution. For different species, sterile degree of sterile air used will have different requirements. In conclusion, the influence factors are complex, multifaceted, must according to the specific conditions, and formulate the specific process parameters.
In determining the amount of bacteria in air, is generally required to field data acquisition, the determination of air bacteria method is generally used to determine the approximate values of the training data or method of optical measurement, but in view of the current technical conditions, in engineering design to accurately measure the amount of bacteria in the air is also not easy. That is to say, to control the filter after the air bacteria (sterile degree) is very not easy. In engineering design, data acquisition is a meticulous and long period of work, if the data acquisition is completed further in-depth design work is unable to meet the user requirements of the design progress, especially in the fierce competition in the market situation, by means losing the market. Since the initial amount of bacteria in the air can not be accurately determined, increases the complexity of the equipment selection and design, quality of products can not be aware of. In order to solve this contradiction, the scientific research units, universities and colleges have done a lot of research work, and summarizes a series of approximate calculation method. We are in Guixi citric acid engineering design, the results of these studies. It is worth mentioning that the results of these studies, due to different experimental methods, the observation angle is different, so the conclusion is different, but one thing is the same, the parties agree to get the basic principle is to filter, because the problem is beyond the scope of this article, it is unknown about fine.
Sterilization method and process of citric acid in Guixi Jiangxi chemical engineering, process parameters of compressed air pressure requirements are as follows: P =2.5kg/cm R =50 ~ 60. relative humidity due to Guixi is located in the southern region, so we use a relatively perfect air handling system (Figure 1), it is suitable for any climatic conditions. Especially suitable for humid southern region.
Its working principle is as follows: firstly, the state of the atmosphere air through a strainer front (oil bath scrubber) pre filtering large dust particles, in order to improve the service life of the compressor, and can improve the effect of sterilization, coarse filtered air is sucked into the compressor in the compression process. When the air is compressed, the air temperature rises rapidly because of the increase of internal energy. The use of thermal sterilization principle, high temperature air at the pipe into the storage tank, a stable gas source, on the other hand, due to the airflow into the storage tank, the flow rate decreases, and in the design of the air storage tank when considering the gas residence time, so, at high temperature under the action of rise to thermal sterilization effect.
Gas after heat sterilization process and stabilized by the storage tank into a cooler, the cooling water, oil, most of the fog into larger particles, due to compression of such fog particle content in the air is large, the choice of cyclone separation. In order to further the moisture in the air separation, air is sent to the second level to cooler for cooling, cooling the compressed air after the fog contains large amounts of water vapor, to intercept the water, should be used in the screen separator.
After cooling the air due to the relative humidity of 100, at this time, if the air filter will make the filter medium become wet, the occurrence of agglomeration deformation, even mildew phenomenon, and not the process of air quality requirements. Therefore, in the process, must be considered to reduce equipment -- heater relative humidity. The parameters of heating air to the process, and then into the sterile filtration equipment, supply device using fermentation.
To achieve the above three key processes. No.