Application of centrifuge in wine processing
Abstract: This paper firstly describes the centrifuge in detail according to the operating principle of the centrifuge. Then, through the brewing process of the centrifuge in the wine, the process of the centrifuge in the winemaking is described in detail. The application in the process has a guiding role. frozen green tiger prawn Green Tiger Prawn,Frozen Green Tiger Prawn,Fresh Green Tiger Prawn,Fresh Frozen Green Tiger Prawn Zhoushan Junwei Aquatic Products Co., Ltd. , https://www.junweiaquatic-intl.com
Key words: Centrifuge Principle Wine Technology I. Introduction Centrifuges are widely used in chemical, petroleum, brewing, pharmaceutical, mineral processing, coal, water treatment and shipbuilding sectors. The working principle of the centrifuge is two kinds of centrifugal sedimentation and centrifugal filtration. The centrifugal filtration is a centrifugal pressure generated by the suspension under a centrifugal force field, and is applied to the filter medium, so that the filtered filtrate passes through the medium to become a filtrate, and is larger. The particles are trapped on the surface of the medium by the filter medium to achieve effective separation between the solid and the liquid. The centrifugal sedimentation means that the suspensions of different densities are quickly settled in the centrifugal force field, so that the solid and the liquid are effectively separated, generally in a centrifuge. The cylinder whose axis rotates is driven at high speed by the drive of a motor, which is called a drum.
Second, the centrifuge classification (a) according to the separation factor Kc size, the separator can be divided into a constant speed centrifuge (Kc < 3000), high-speed centrifuge (Kc = 3000-5000), ultra-high speed centrifuge (Kc> 5000) In wine production, for the clarification of grape juice and the pre-clarification of wine, a centrifuge with a separation factor of 5000-8000 is generally used. For the wine before bottling, a centrifuge with a separation factor of 1400-15000 is generally used.
(2) According to the position of the rotating shaft, the centrifuge can be divided into a vertical centrifuge and a horizontal centrifuge; in the domestic wine production, a vertical disc centrifuge is generally used, and the maximum solid content is generally not more than 5%. The separable solid particles have a minimum diameter of 0.5 μm; while horizontal centrifuges are rarely used in domestic wine production, and are mostly used in sewage treatment enterprises to handle a maximum solids content of up to 60%.
Third, the centrifuge principle Separator is the use of high-speed rotating centrifugal force to separate the liquid-insoluble solids from the liquid, so that the product reaches a certain degree of clarity; and the magnitude of the centrifugal force is related to the rotational speed and diameter of the drum, and is proportional In addition, the separation effect is also related to the separation temperature, the treatment amount, and the outlet pressure. The higher the separation temperature, the smaller the treatment amount, and the higher the outlet pressure, the better the separation effect;
Let's take the vertical disc centrifuge as an example to briefly introduce the operating principle of the centrifuge: there is a self-cleaning disc type drum in the centrifuge, the drum is used for liquid purification or solid collection, due to the difference in density between solid and liquid, and By the action of centrifugal force, the solid is separated from the liquid, and the drum is shown in Fig. 1. The material slowly enters the drum from the water seal inlet 1. In the separator, the material is accelerated to the drum speed and into the disc group 4. The disc group is composed of a plurality of conical discs, one by one. The narrow gap separates the liquid into a thin layer, which minimizes the pad distance. The solid particles smashed at the bottom of the upper disc and slipped into the solid collection zone 6. The purified liquid flows to the center of the drum and enters the centripetal The pump chamber is pressurized by the centripetal pump 3 and discharged from the drum. The separated solids are periodically discharged from the solid discharge port 7 at the bottom of the drum. The slagging process is initiated by the control unit 17, and the slag discharge is automatically triggered by the self-control system at the most appropriate time. The self-control system works by sensing the solid material level in the liquid sensing drum, and a small portion of the sensing liquid flows into the branch through the separation disc 5, passes through the induction liquid pump 15 to the flow switch 16, and then flows back to the feed port, if the separation disc The sensing liquid at the sheet 5 is blocked by the accumulation of solids in the solids collection zone 6, and the proximity switch on the flow switch 16 will send a pulse signal to the control unit 17, causing slagging. The diameter of the separation disc 5 must be adapted to the specific application. For example, if the separation disc is too large, the self-control pulse signal will be sent too early, and the solid collection area is not filled. If the separation disc is too small, the solid collection area will be The overflow causes the purification process to be degraded. The material is separated from the surrounding environment by an additional immersion disc (special version) in the centripetal pump 3. The material chamber is sealed by the induction liquid pump 15 on the main centripetal pump. The centrifuge adopts frequency conversion speed regulation, which can adjust the speed according to different process requirements. According to different materials, it is convenient to select multi-speed operation. At the same time, the frequency conversion control system is used to realize the soft start of the drive device, so that the impact on the power grid is reduced, and the inverter has Overvoltage overload and overcurrent function, when the motor or running load is abnormal, the inverter will quickly stop the output and block the output due to the fault, thus achieving the function of protecting the motor in time.
Fourth, the process of centrifuge in wine (a) for the clarification of dry white grape juice before clarification treatment of dry white grape juice before alcohol fermentation, can reduce the content of higher alcohol in wine, improve the content of lipids , especially the content of six carbon, eight carbon and ten carbon fatty acid ethyl esters, thereby improving the quality of dry white wine; in the actual production process, the pressed dry white grape juice is generally placed in a low temperature clarification tank to lower the temperature 0-5 ° C, standing for 1-2 days, then extract the supernatant and clarify by a centrifuge;
(2) After the fermentation, the grape raw wine is changed once in a barrel. After the fermentation, the wine is still cloudy because it contains some suspended matter, including pectin, peel, seeds, etc. These substances are still suspended in the wine due to the release of CO2. In the middle, after standing, these substances will gradually settle on the bottom of the tank, and the purpose of changing the barrel is to separate the wine from other sediments; in the Yantai area, the grape fermentation season is generally from September to October, and the wine is changed once in the beginning of December. The changing barrel process is generally carried out simultaneously with the centrifugal treatment.
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