DEAR Air separation plant.For the horizontal molecular sieve adsorber, the bed is uneven due to the fluctuation of air flow, resulting in short circuit of air flow; for the vertical molecular sieve adsorber, due to the gap of adsorption bed, resulting in short circuit of air flow.DEAR Air separation plant.Long tube and short tube condensing evaporators are tubular type. The copper tubes are arranged vertically according to concentric circles or equilateral triangles. Brass tube sheets are installed at the top and bottom. The tubes and tube sheets are soldered with tin. The long tube is for liquid oxygen evaporation, and the short tube is for gas nitrogen condensation. The length of long tube is about 3M.The heat transfer process of fluid passing through the wall is a complex process, and there are many factors affecting the heat transfer. The experimental results show that the hourly heat transfer Q (also known as heat load) is directly proportional to the temperature difference △ t (℃) between cold and hot fluids, and is directly proportional to the size of heat transfer area f (M2). The formula is q = 3600kf △ t (kJ / h).
Generally, the state of 1 standard atmospheric pressure (0.1013 MPa) and 0 ℃ is called standard state, and the volume in this state is called standard cubic meter. Therefore, when the volume output per hour of various products of the oxygen generator is m3 / h, it actually refers to the volume under the standard state.DEAR Air separation plant.Medium pressure blow off: after high pressure blow off, close the main inlet valve of high pressure air and open the blow off valve of oil-water separator. Install high pressure and medium pressure gauges, install and close throttle-1 valve. Close the blow-1 and blow-2 valves, then open the main inlet valve of high pressure air and close the blow off valve.DEAR Air separation plant.Attention should be paid to the following points when degreasing: degreaser with oil content less than 50mg / l can be used as net degreasing agent, degreaser with oil content in the range of 50-500mg / l can only be used for crude degreasing, and then it must be cleaned again with net degreaser. If the oil content is more than 500 mg / L, it must be distilled and regenerated, and the oil content must be tested before it can be used for degreasing;
The activation temperature should be higher than 200 ℃ and lower than 250 ℃. When the outlet temperature reaches 80 ℃, it can be cold blown. The activation time shall not be less than two switching cycles; when the molecular sieve adsorber is started, the process of gas supply and pressure rise shall be slow, and when the vent valve is closed, care shall be taken to prevent the molecular sieve in the bed from being damaged due to pressure fluctuation; when the two expanders need to be started, the outlet return valve of the booster shall be fully opened to reduce the pressure of the first operating expander, and then the two expanders shall be loaded at the same time to prevent the latter The start-up supercharger has a surge;DEAR Air separation plant.The heat q is transferred from wall 1 to wall 2 (temperature TW2) through the inside of the wall. This process of heat transfer in solid is purely by molecular collision, which is called heat conduction (or heat conduction). Heat conduction can also be carried out in liquid and gas, but pure heat conduction can only occur in static fluid.
