How to deal with moldy cold storage accessories

How to deal with moldy cold storage accessories

1. Analyze the reasons

　　 Inspect the entire refrigeration system to confirm the cause of frost damage and find out the leaks.

　　 Two, segmented blowdown

　　 You can use an air compressor to blow water (save nitrogen) until no water mist is deposited. Blow with high-pressure nitrogen to heat the nitrogen while blowing (nitrogen cylinders are prohibited from heating).

　　 Due to the complexity of the refrigerant system piping, a welding torch can be used to blow off the water in certain parts according to the specific situation.

　　 Heating and drying, small parts such as capillary tubes, thermal expansion valves, compressors can be baked and dried in the oven. The refrigerating oil must be replaced after the compressor is dried by water

　　Three, vacuum drying

　　Restore the pipeline, press nitrogen to maintain the pressure to ensure that the system is airtight, and then connect the vacuum pump for vacuum drying. (The dry filter barrel must be added to the front of the vacuum pump to avoid excessive water vapor entering the vacuum pump) During the vacuum drying process, the parts of the pipeline that are likely to contain water can be heated. The time depends on the site.

　　 Four, debugging and running

　　 Confirm that the water in the system is basically removed.

　　 Connect the external drying filter barrel to the system, and replace the desiccant after 5 minutes of operation. At the same time, observe the operating parameters of the unit and pay attention to the operating sound of the compressor. If the dryer filter is cold, the expansion valve is frosted, and there is a pressure difference of more than 0.5 kg before and after the return air filter, it should be shut down immediately.

　　 Repeat the above work, continuously replace the desiccant, the interval time can be gradually increased with the number of times. (Desiccant: Calcium chloride dry particles have a large water absorption capacity, which is used when there is too much moisture at the beginning, and the color-changing silica gel can accurately detect the moisture content, and can be used in the later drying).

　　 Finally, change the desiccant to discoloration silica gel, and run for 24 hours to confirm that the discoloration silica gel maintains its original color

　　 Five, repair is completed

　　Remove the dry filter barrel from the refrigerant pipeline to restore it. Check the amount of supplemental refrigerant. Turn on and check the operating parameters of the machine to confirm that it is normal.

Precautions

　　 Dry filter barrel: Since the gasket of the external dry filter barrel is usually an asbestos pad, the refrigerant is not tightly sealed. Therefore, it is not allowed to run on the system for a long time. It should be removed after maintenance to avoid fluorine leakage.

Prohibition of methanol: the addition of methanol can increase the freezing point of water and relieve ice blockage, but the water in the system has not decreased, and as the circulation time of water in the system increases, it will cause deterioration of refrigerating oil quality, copper plating of system metal parts, and corrosion of the press The leakage of the coil caused serious personal injury.　Molds generally grow in dark and humid places and can adapt to lower temperatures. Usually in high temperature storage, the situation z* is serious. Mold grows in the cold storage, and the spores will fly everywhere, which will contaminate the goods and products stored in the storage. The mold itself is harmless and does not produce toxins, but if the mold grows, the appearance of the product will be greatly reduced, and it will promote the rot of the meat. Therefore, the work of removing mildew has always been valued by people, but although there are many existing methods for removing mildew, they are inconvenient to implement. Today we talk about how the physical mold removal method is specifically done:

　　 This method uses physical means such as temperature, humidity, ultraviolet light, high-frequency electricity, and copper wire mesh filters to remove mold. The temperature of mold growth is generally between -6°C and 40°C. For this reason, mold growth is rarely seen in low-temperature storage, and hot alkaline water can also be used to kill mold on tools and equipment.

　　The growth of mold has a great relationship with temperature, so temperature control can only be used appropriately. Using ultraviolet light to remove mildew is a better method. It can not only sterilize but also remove mildew, but also has some deodorizing effects. But this can only work on the directly irradiated part. Generally, 0.33 to 3 watts of ultraviolet radiation per cubic meter can be used to kill microorganisms in an area of 2 meters away for 6 hours.

　　 But the effect of ultraviolet light is affected by temperature and humidity. The closer to the normal temperature for microbial growth, the higher the humidity and the stronger the ability to sterilize and remove mildew. Ultraviolet light can promote the oxidation of fat, so be careful when using it. The copper wire mesh filter is equipped with a copper wire mesh at the upwind, so that a considerable part of the mold can be killed.

　　 The physical method of removing mildew may be more troublesome. There is also a more convenient method of removing mildew, the mechanical method of removing mildew. How does it work? This method is to clean and eradicate the mold. It is also combined with other mold removal methods. There is an air washing method in the mechanical mold removal method. This is to install a water sprayer at the air inlet. When the air circulates, the mold spores are washed away through the water. This method is like the current wet air cooler. Similarly, it can reduce mold.