The temperature difference between nitrogen and air is increased from 4 ℃ to 6.5 ℃ and the temperature difference between oxygen and air is increased from 5 ℃ to 18.5 ℃ because the temperature of air entering the device is increased from 30U to 51.5 ℃. At this time, we should check the cause of air temperature rise into the tower and eliminate it.Air separation plant.According to the weight of different fractionating tower, select appropriate steel wire rope, hang the tower flat on the sleeper, and carry out air tightness test; tie the steel wire rope to the lower part of the upper shell, and pad it with about 10 mm wood around to prevent the shell from deformation, and then lift it to the specified position with crane;The newly installed fractionator must be thoroughly heated and purged before start-up and long-term shutdown. After putting into operation, when the suspension fault of the fractionator cannot be eliminated, or the pressure difference before and after the heat exchanger pressure is greater than 0.5MPa at the end of the operation cycle, or the purity and yield of oxygen and nitrogen are decreased, heating and blowing should be carried out.
If the effective energy of the environmental state is zero, the air is separated into oxygen and nitrogen, that is, in an unbalanced state with the environment, it needs to consume energy, that is, the separated product has effective energy. Because the raw air is in the environmental state, its effective energy is zero.Air separation plant.When water enters the cold accumulator (or switching heat exchanger) to freeze and block the channel, the resistance will be greatly increased, the upper tower pressure and the exhaust pressure of the air compressor will be increased, the switching sound will become dull and elongated, and a large amount of water gas can be seen in the waste nitrogen discharge pipe. These phenomena can be used to judge the water inflow accident of the cold accumulator (or switching heat exchanger).At the beginning of heating, it is necessary to turn down the oxygen and nitrogen vent valves, limit the discharge volume, increase the low pressure pressure, increase the gas volume of the pipeline with large resistance, and speed up the heating thoroughly. When the fractionator is heated, the molecular sieve purifier also needs to be heated. If the low pressure is too low, the regeneration of purifier will be affected. But the pressure should not exceed the normal working pressure to ensure safety.
Krypton and xenon are mainly used in electric light sources. The lamp filled with krypton, xenon and argon mixture has the advantages of small volume, long service life and high efficiency. Generally, the efficiency is 4-5 times higher than that of incandescent lamp, and the service life can be increased by 2-3 times. Krypton and xenon are used in flash lamp and stroboscope. Because the discharge intensity of xenon lamp is higher than that of sunlight, the long arc argon lamp filled with xenon gas, commonly known as "little sun", has strong fog piercing ability, and can be used for lighting in airports, stations, docks and other places, as well as in the battlefield.Air separation plant.The amount of rising steam at the liquid layer thickness is less. Although the oxygen in the gas is fully condensed, due to the less amount, the latent heat of condensation is also less, so the amount of nitrogen evaporation in the liquid is less, which also affects the distillation. Due to the reduction of distillation efficiency, the purity of oxygen and nitrogen will be affected. The degree of influence varies according to the inclination of the tray.
