First, the fermenter cleaning method Cleaning in the brewing and beverage industry is often a largely automated operation. At present, the common method used by Zui is to fix the ball washing, and the rotating nozzle cleaning is more and more adopted. Fixed ball washing The traditional fixed ball washing has been used since the beginning of the last century, and it is still the cleaning device commonly used by Zui. Many suppliers offer ball washing in a variety of different forms, sizes and capabilities. It can spray the cleaning liquid onto the tank wall for a simple and simple cleaning. The fixed washing ball is used to flush the tank wall, and the water is sprayed from the separate nozzle holes with holes, and the flow is sprayed to the same position on the tank wall. Due to the size limitation of the nozzle, the force of each impact point being sprayed onto the tank wall is very good. Limited, the amount of water that is not impacted is actually zero. This means that in order to achieve the required cleaning effect, a large amount of high-concentration chemical cleaning agent or high-temperature cleaning solution must be used for long-time cleaning. The fixed washing ball can also be used as a kind of filter to filter the particulate matter in the cleaning liquid. Therefore, some of the ball washing holes are easily blocked and do not work, resulting in unqualified cleaning of the surface of the tank wall, and this phenomenon generally does not appear immediately. Only when accumulated to a certain extent will it be discovered. 2. Rotating nozzle Many examples show that rotating nozzles are superior to conventional fixed ball washing. The rotating wind generated by the rotating nozzle causes the tank wall to be sprayed in an irregular manner. The combination of the cleaning method and the mechanical impact force uses less water than the fixed washing ball, and a small amount of chemicals can be consumed to remove the residue in a short time. 3. Rotating nozzle The current rotating nozzle uses a cleaning medium as a driving force, and the cleaning nozzle rotates in a vertical axis direction. The rotary nozzle is generally rotated to the eighth cycle to complete a spray cycle. The nozzle size and medium pressure determine the throughput, spray length and nozzle rotation, as well as the associated cleaning time. The normal working pressure is 6 kg - 8 kg. Second, the necessity of large cleaning In the beer production process, the material passes through many containers and the pipeline is long, and the raw materials used are rich in nutrients, which leads to high frequency and difficulty in cleaning the equipment and pipelines in the beer production process. In daily cleaning work, it is inevitable that equipment hygiene corners will occur, which will affect the hygiene control of the production process. In order to eliminate the hygienic corners of daily cleaning, you can use the strong cleaning agent in the off-season or manually clean the equipment thoroughly. We call it “great cleaning†to avoid the accumulation of dirt due to the accumulation of dirt in the sanitary corner of the equipment. . Third, the problem of the fermenter in the actual cleaning 1. The fermentation process produces a large amount of protein, hop resin, polysaccharide, yeast, etc. After the fermenter is emptied, organic matter and inorganic matter adhere to the tank wall, which is yellowish brown. When the amount of tartar is large, the surface is white, and like the skin of saline-alkali, inorganic matter and organic matter are intertwined. The use of caustic soda during cleaning only has an effect on the removal of organic matter, and the cleaning temperature reaches 80 ° C or higher, so that it has a good cleaning effect. It is cleaned with a single cleaning, but it has a certain effect on inorganic substances and is almost ineffective against organic substances. The fouling of the fermenter wall is a mixture of inorganic and organic materials, and it is difficult to clean with a single cleaning agent. Therefore, some breweries carry out a large cleaning of the fermenter every year and thoroughly clean the fermenter. 2. The anti-corrosion layer of the fermenter wall T541 is partially damaged. After repairing, the surface finish is obviously reduced, which makes the cleaning of the tank wall dirt difficult. 3. The wear or blockage of the washing tank or the washing ball causes the partial fermenting tank to be incompletely cleaned and the dirt accumulated more. Due to the above factors, after a few years of use, the fermenter has accumulated a certain amount of dirt on the tank wall, which is difficult to completely remove using conventional cleaning processes. Therefore, every 4 to 5 years, the fermenter can be deeply cleaned in the off-season. Fourth, the fermentation tank large cleaning process According to the size of the fermenter and the frequency of use, the author has specially formulated the following processes: 1. Preparation of alkaline washing liquid (in 5 tons) (1) Add some cold water to the CIP tank. (2) Add 300 kg of HPC-1 high-efficiency alkaline cleaning agent and 150 kg of caustic soda inward. (3) Replenish the remaining amount of water to 5 tons and heat up to 65 °C for use. 2. Preparation of acidic washing liquid (in 5 tons) (1) Add some cold water to the CIP tank. (2) Add 300 kg of HPC-4 high-efficiency acid cleaning agent inward, and then add some cold water. (3) After adding 200 kg of penetrant, add the remaining amount of water to 5 tons, and keep it at room temperature. 3. Specific implementation of the operating process (1) Rinse the tank for 15 minutes with warm water. (2) The alkaline washing solution is circulated for 3.5 hours to ensure that the reflux temperature is not lower than 62 ° C (the cycle time starts at the reflux temperature and reaches the process specification). (3) The tank is rinsed with fresh water to reflux water, and the pH is neutral. (4) The acidic washing solution was circulated and washed for 2.5 hours at room temperature. (5) The tank is rinsed with fresh water to reflux water, and the pH is neutral. 4. Adding process of washing tank After cleaning one fermenter, it is necessary to add the medicine to the washing tank before the next tank can be cleaned. (1) Alkaline washing solution: 100 kg of HPC-1 and 60 kg of caustic soda. (2) Acidic washing solution: 100 kg of HPC-4 and 60 kg of penetrant. (3) After brushing 6 fermentors, drain the washing liquid and reconstitute. 5. Notes (1) When preparing the acidic washing solution, it should be noted that the HPC-4 high-efficiency acid cleaning agent stock solution is not in contact with the penetrant stock solution. The correct preparation is: first inject 1/4-1/3 water into the washing tank; then slowly add acidic cleaning agent, after adding water to 1/2 or more, slowly add penetrant; after Zui, add a little water to wash Liquid scale. (2) The CIP system should be added to the self-cleaning system. The CIP tank itself should be kept clean and cleaned regularly. A filtration system is required on the circuit to ensure the cleaning of the washing liquid and to prevent the dirt from entering the scrubber and causing clogging. (3) The sampling valve is backwashed synchronously during CIP cleaning. (4) After the hose and the connecting tube are thoroughly cleaned, they are immersed in the disinfectant, and the hose should be brushed and cleaned regularly. (5) Increase the cleaning, sterilization and protection of the nozzles, sampling valves, nozzles and other components to prevent secondary pollution. (6) Ensure that the washing system is operating normally, including whether the washing machine is rotating, whether the washing ball is blocked, and whether the pressure is appropriate. The washing work pressure should be 0.35±0.05MPa, that is, the CIP tank outlet pressure gauge should be between 0.45MPa and 0.50MPa (considering the influence of pipeline, bend and tank height). The ball washing pressure is too large, it is easy to cause atomization, affecting the use effect. The working pressure of the tank washer should be ≥0.35MPa, and the outlet pressure gauge value of the CIP tank should be 0.55MPa-0.60MPa. (7) After the alkaline cleaning agent is finished, the flushing process must be intermittently prevented to prevent the foam from staying at the bottom of the tank. Although the pH value is neutral, it is not necessarily a true result. Intermittently, the lye and foam can be completely completed. Rinse and remove the adverse effects of residual lye on acidic cleaning solution and sterilizing solution. In addition, special attention should be paid to the dead corners of the CIP system, that is, all parts that come into contact with the cleaning agent, which must be flushed to neutral before being subjected to the sterilization process. (8) If the large tank is directly used as a refrigerant with liquid ammonia, it is necessary to completely recover the liquid ammonia and then carry out a large brushing process. (9) Confirm that the vacuum valve of the large tank is working properly. (10) The operator should be well protected, with gloves, protective glasses, etc., do not splash on the skin and eyes, accidentally splashed on the skin, must be washed with plenty of water. V. Comparison of effects after large cleaning Before the production in 2007, after the fermenter was thoroughly cleaned by the large cleaning process, the hygiene pass rate of the fermentation broth was greatly improved compared with 2006. After the large cleaning, the interior of the fermenter looks like a new can, bright and clean. From the above statistical analysis of the large washing tank, it can be seen that the fermenter is cleaned before production every year, and the dirt accumulated in the tank for one year can be thoroughly cleaned, which is beneficial to improve the level of fermentation hygiene control and improve product quality. However, the cost of cleaning has increased.