DEAR Air separation equipment.From the operation point of view, electric heating will not affect the regeneration of adsorber due to steam leakage, so the equipment cost is low. Whether steam or electric heating is used for regeneration of Molecular Sieve Purifier depends on equipment capacity and plant conditions. Generally, if the capacity of equipment is large and the factory has sufficient steam source, steam heating is often used;If the liquid oxygen level is too high, the static pressure produced by the upper liquid oxygen to the lower liquid oxygen will be greater, the evaporation temperature of liquid oxygen will increase, and the average temperature difference between liquid oxygen and gas nitrogen will decrease, which is not conducive to the evaporation of liquid oxygen. Moreover, if the liquid level is too high, a part of liquid oxygen may be brought out from the oxygen outlet pipe, so that liquid oxygen enters the bottom of the heat exchanger and affects the temperature difference at the hot end of the oxygen.
DEAR Air separation equipment.The main cooler is not cooled through in advance, which makes it impossible to transfer the cooling capacity to the tower in the liquid accumulation stage, while the switching heat exchanger appears to have excess cooling capacity and supercooling. At this stage, if the liquefaction amount of air is larger, it will be more conducive to the exertion of the cooling capacity of the expander, so as to accelerate the accumulation of liquid.DEAR Air separation equipment.Low pressure small diameter has threaded flange, high pressure and low pressure large diameter are welded flange, different pressure flange thickness and connecting bolt diameter and quantity are different. According to different levels of pressure, flange gasket also has different materials, from low pressure asbestos gasket, high pressure asbestos gasket to metal gasket.DEAR Air separation equipment.Plate fin type is widely used in various air separation plants, mainly used in medium and large air separation plants. It is the condensation and evaporation of gaseous nitrogen and liquid oxygen in the adjacent channels. The adjustment of their heat load should be carried out according to their different working principles.
The products of air separation plant have many specifications due to different output, variety and form. In order to be easy to identify, a unified product model code has been compiled in China. It consists of Pinyin letters and numbers. The first (or one or two) letter represents the product category; the second letter represents the process and structural characteristics; the following is the product chemical element symbol; the number represents the output of various products; for gas, it refers to the volume under the standard state (0 ℃, 0.101325mpa); finally, it is the variant design number.We should give full play to the refrigeration capacity of several expanders, rationally distribute and utilize the cooling capacity, and shorten the start-up time by relying on the potential of the equipment itself. Because of the large heat capacity of the stone accumulator, it takes quite a long time to cool down to normal temperature after heating. The air from the turbine air compressor can be used to blow the packing close to the normal temperature before starting the expander, and the hot air can be discharged from the automatic valve box. This can shorten the precooling time of packing.
Improper use of bactericides and algicides. For the poor cooling water, if the use of bactericidal algicide, it will produce a lot of bubbles in the cooling water, causing air to carry water. At this time, attention should be paid to adding the dosage of sterilization and algae killing, or adding defoamer at the same time;At present, a new type of packed tower is used in 6000-0000m3 / h air separation plant, which adopts alpha Bauer ring, conjugate ring and step ring. It has the advantages of large flow rate, small resistance, good heat transfer effect and good strength. The temperature difference of heat transfer at the hot end is about 0.5 ℃, and the negative temperature difference of effluent (water temperature is lower than nitrogen temperature) can reach 4 ~ 9 ℃, depending on the gas-liquid ratio.DEAR Air separation equipment.Whether the molecular sieve is filled and leveled; the manhole of inner and outer cylinder shall be sealed carefully to prevent mutual gas channeling; during the operation of molecular sieve adsorber, the temperature curve of molecular sieve and the content of carbon dioxide at outlet shall be monitored regularly to judge whether the adsorber works normally; the switching procedure and pressure difference of adsorber shall be closely monitored.
