What problems should be paid attention to in the operation of vacuum dryer?

The vacuum dryer has the advantages of fast drying speed, high efficiency and no damage to the nutritional components of the product It is mainly designed for drying heat sensitive, easy to decompose and easy to oxidize substances At the same time, it can also be filled with inert gas, especially some materials with complex components can also be dried quickly At present, the equipment has been widely used in the dehydration and drying of fruits and vegetables, food, health products, drugs, etc its drying quality is good, more and more favored by users According to a technician, vacuum dryer mainly uses vacuum drying technology, and realizes continuous feeding and discharging under vacuum state Due to the low oxygen content when drying under low pressure, it can prevent the oxidation and deterioration of the dried materials At the same time, it can vaporize the moisture in the material at low temperature, especially suitable for drying the heat sensitive material It is worth mentioning that vacuum drying with recovery device is an environmental protection type of "green" drying, which is convenient to collect important components in materials and recover pollutants With the rapid development of the food industry, as well as the national attention to energy conservation and environmental protection of food equipment, coupled with the upgrading of consumption, people's demand for healthy, nutritious and safe food is increasing, which provides a good opportunity for the development of vacuum dryer It is true that vacuum drying equipment plays an important role in food drying process with its own advantages However, users need to pay attention to some problems when operating the vacuum dryer Vacuumizing: users need to vacuumize before use, then heat up and operate the equipment According to the industry If heating first and then vacuuming, this may cause the efficiency of vacuum pump to drop Because when the heated air is pumped out by the vacuum pump, the heat will inevitably be brought to the vacuum pump, resulting in the high temperature rise of the vacuum pump In addition, because the vacuum dryer works in the vacuum sealed state, if it is heated first, the gas will heat up and generate huge pressure, which is a potential danger Explosion proof and anti-corrosion it is understood that the vacuum dryer should be used in an environment with relative humidity ≤ 85% RH and no corrosive performance gas around It should be noted that since the working room of the vacuum double cone rotary vacuum dryer is not specially treated for explosion-proof and anti-corrosion, in order to ensure the operation and use safety of the equipment and extend the service life of the equipment, the user should not put materials that are easy to be natural, explosive and prone to corrosive gas, so as to avoid the normal operation of the subsequent equipment Do not work long hours Generally speaking, the vacuum pump can not work for a long time, so when the vacuum degree meets the requirements of the vacuum dryer for drying materials, first close the vacuum valve, and then close the power supply of the vacuum pump When the vacuum degree is less than the requirements of the vacuum drying equipment, then open the vacuum valve and the power supply of the vacuum pump, and continue vacuuming, which is conducive to extending the service life of the vacuum pump, to a certain extent Users save the cost of replacing vacuum pump or vacuum dryer Open the air valve for sampling Generally speaking, the vacuum dryer needs to take samples during operation to check the drying conditions of materials or analyze materials, so as to better carry out the subsequent process During sampling, it is necessary to close the vacuum pump, open and start the vacuum pipeline valve, and then open the vent valve on the vacuum system to let the gas into the equipment, and first suspend the main engine Among them, sampling can be carried out according to the processing needs After sampling, the equipment can be turned on again Compared with the traditional vacuum dryer, as a drying equipment, vacuum dryer has obvious advantages and broad market prospects The vacuum dryer not only improves the drying efficiency of materials and ensures the drying quality, but also has the characteristics of green environmental protection, which conforms to the requirements of green environmental protection advocated by the state However, users still need to pay attention to some problems in operation to ensure the safety of the vacuum dryer.