DEAR Air separation equipment.The fault occurs at each connection. The causes of this kind of failure include cold and freezing of valve packing, leakage of connecting flange between valve seat and pipeline, leakage of tin filling thread at both ends of valve screw sleeve, etc. The valve stem packing is generally in the packing groove where the valve stem is close to the wall of the cold box.If the upper and lower correction irons outside the shell of the fractionator are broken or lost during transportation, the pearlite in the fractionator shall be unloaded, a vertical line shall be hung from the top of the upper tower to the condensing evaporator, and the distance between the vertical line and the tower body shall be measured from the top, middle and bottom, and the verticality deviation shall not be greater than 1 / 1000. Every 90 degrees, the measured values should be basically consistent. If not, the bottom of fractionator can be adjusted by adding pad iron to make it meet the requirements.
DEAR Air separation equipment.The heat transfer is proportional to the temperature difference. If the ambient air temperature increases, the temperature difference with the inside of the device will expand, and the loss of cooling will increase. Therefore, the loss of cold running in summer is greater than that in winter, and that in day is greater than that in night.DEAR Air separation equipment.The method of intermediate extraction is to open the ventilation and extraction valves for 4-5 turns, and then slowly open the regulating valve-7. A part of the air can be extracted from the middle, and combined with the low-temperature air from the ventilation valve-4 to enter the carbon dioxide adsorber. When the middle part can not be pumped out temporarily, it means that the resistance of the central extraction pipeline is large, the air only goes through - 2 valve and - 4 valve, and the automatic valve of the central extraction can not be opened.DEAR Air separation equipment.If there is air leakage, the gas shall be discharged and the pressure shall be increased again after elimination. Stop air intake and check once every 1MPa rise until the maximum allowable working pressure of the equipment is reached. Remove the air inlet pipe connector. Check the high pressure air inlet flange, expander inlet valve, high pressure blow off valve and pressure gauge for air leakage with soapy water.
DEAR Air separation equipment.In order to balance the cooling capacity, it is necessary to increase the pressure of high-pressure air, which will increase the energy consumption of the device. Therefore, the inlet air temperature of medium pressure process expander should be kept within the range of process specification requirements, and should not be increased at will.DEAR Air separation equipment.At this time, the valve will lose its closing function. Sometimes the damage of locking nut is caused by improper material and substitution of cold brittle metal. Another common fault is that the valve top is not closed tightly, that is, the valve leaks. The common reason is that the sealing surface of valve top and valve seat is crushed by hard objects (such as silica gel, metal chips, welding slag, etc.), forming dents.Oxygen blowing in EAF steelmaking can accelerate the melting of burden and oxidation of impurities, save power consumption, and gradually become a fixed oxygen user. Oxygen enriched blast in blast furnace ironmaking can increase pulverized coal injection, save coke and reduce fuel ratio. Although the purity of rich oxygen is not high (oxygen content is 24% - 25%), the oxygen consumption is considerable due to the large amount of blast, which is close to one third of the oxygen used in steelmaking. Therefore, it has also become a major oxygen user.
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;DEAR Air separation equipment.Due to the large amount of molecular sieve, the molecular sieves produced by different kilns are different. Therefore, the molecular sieves from the same batch of kilns should be evenly filled into two molecular sieve tanks. After the completion of filling, use the flattening mechanism to flatten, and check whether the molecular sieve filling reaches the standard height (the ring chamber has been buried under the molecular sieve). The molecular sieve is leveled again until the molecular sieve on the sieve bed is smooth and there is no concave convex problem. If there is no problem, it can be considered that the filling work is finished.
