DEAR Air separation unit.Copper pipe or stainless steel pipe shall be used at the front and back of valve, elbow, reducer tee, etc.; straight pipe section with diameter greater than 5 times of elbow diameter shall be used at the front and back of elbow; non combustible non cotton asbestos, polytetrafluoroethylene, annealed copper sheet, annealed aluminum sheet, etc. shall be used for packing and flange gasket;DEAR Air separation unit.The corresponding model of the equipment matched with the air separation unit has also been compiled. For example, the model of fractionator: fon-6000 / 13000 means: f-fractionator: on oxygen and nitrogen products; 6000 - oxygen production, m3 / h; 13000 - nitrogen production, m3 / h. Model of liquefaction equipment: ypon -- 200 / 300 means y-liquefaction unit; p-expander; on oxygen nitrogen product; 200 liquid oxygen output L / h; 300 liquid nitrogen output L / h.When extracting rare gas, the distillate gas or liquid containing the rare gas must be extracted from the relevant parts of the distillation column, and then returned to the distillation column after separation. Some need to extract liquid air, liquid nitrogen or medium pressure gas as the cold or heat source of additional equipment.
DEAR Air separation unit.1m3 air with pressure of 0.6MPa is compressed by air with pressure of 0.1MPa and volume of 6m3. The moisture content in 1m3 air also increased to 6 times, that is 6 × 30.3 (g / m3) = 181.8g/m3. If the temperature remains unchanged, the air can only hold 30.3g/m3 of water, then five sixths of the water will be released. With the increase of pressure, the more water is precipitated; the better the cooling effect is, the more water is precipitated.The purpose of purging after heating the fractionator is to remove the mechanical impurities in pipes and vessels. The blowing out steps are as follows: the preparation before blowing out: close the main inlet valve of heating air and all heating valves, open the blowing out valve of oil-water separator of purifier at the same time, loosen the ejector rods of inlet and outlet valves of expander, close the on-6 valve, pull open the stem of joint-1 valve, open the blowing-1 valve, blowing-2 valve and high pressure gauge valve, and close the blowing out valve of oil-water separator of purifier;
DEAR Air separation unit.The chiller uses the artificial method, depending on the consumption of energy (work or heat), and constantly takes away heat from the cooled material, so as to achieve the process of getting lower than the ambient temperature. At present, the most commonly used refrigerator is the compression refrigerator, which uses substances with low boiling point (ammonia, freon, etc.) as the working medium, called "refrigerant".DEAR Air separation unit.Whether the cold insulation material in the dead corner of the cold insulation box is full; whether the cold insulation material sinks after the equipment is running, causing the upper part to have a gap. The greater influence is whether the cold insulation materials keep dry. Because the thermal conductivity of dry pearlite is only 0.03-0.04w / (m ·℃), the thermal conductivity of water is 15-20 times of that of ice and 60 times of that of ice.DEAR Air separation unit.The liquefying temperature of neon and helium is very low. Under normal pressure, the liquefying temperature of neon and helium is 27.26k and 4.21k respectively. Neon is very inert and liquid neon is very safe as the coolant of low temperature laboratory. At the temperature of liquid helium, the conductor will lose its resistance, and there is no loss when the current passes through, forming "superconductivity", which can be made into a superconducting motor. Therefore, with the development of ultra-low temperature technology, liquid helium will play an increasingly important role.
