Liquefied air separation FAQ

I. Start-up operation should be conducted according to the following requirements: 1. Water should be supplied to the cooling water system and the cooling water system. When the cooling water is below 20 °C, the regulating valve should reduce the water supply of the cooling water; 2. Start the generator pump and the absorbent pump to make the solution circulate; 3. Slowly open the valve of steam or hot water to supply water to the generator. For the unit with steam as the heat source, the unit should be operated under low steam pressure first, and after no abnormal phenomenon, the steam pressure should be gradually increased to the specified value of the equipment technical documents; 4. When the water bag of the evaporator's refrigerant has enough water, the evaporator pump should be started, and the refrigerator should be adjusted to make it run normally; 5. During the start-up operation, the vacuum pump should be started, remove the residual air in the system or the non-condensab...

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The heat capacity of the Plate-fin switching heat exchanger is small, and the start-up time of the air separation plant is short, which is 30 ~ 36 H level; the start time of the air separation unit with stone cooler needs 48 ~ 60h. In terms of operation, master the essentials of operation: prevent moisture and carbon dioxide from being brought into the tower; strictly control the temperature difference between the cold end and the hot end; pay attention to the cooling of the main cooling; give full play to the refrigeration capacity of multiple expansion machines; reasonable allocation and utilization of cooling capacity, depending on the potential of the equipment itself to shorten the start-up time. Because of the large heat capacity of the stone cooler, it takes quite a long time to cool down to normal temperature after heating. The air of the turbine air compressor can be used to blow the stuffing to near normal temperature before starting the expansion machine, and hot air can ...

What should be paid attention to after using molecular sieve to purify air?

If the automatic adjustment system of the liquid level of the air cooling tower fails, it is easy to cause water accidents of the air separation tower, so the reliability of the self-adjustment system of the liquid level must be improved. Attention should be paid when installing: 1) the differential pressure transmitter should be installed on the same reference horizontal plane with the air cooling tower bottom; 2) the positive pressure and negative pressure diversion pipes should be introduced into the differential pressure transmitter on the same horizontal plane; 3) in winter, heating and antifreezing measures should be taken to prevent the static water in the diversion pipe from freezing. In order to improve its working stability and accuracy, a standard liquid level container can be installed in the negative pressure lead-out pipe. In the standard liquid level container, the height H of the liquid level is maintained constant by supplementary water and overflow pipe, which is g...

With the increasingly wide application of cryogenic liquid, in order to reduce material cost, improve storage efficiency, reduce equipment floor area, reduce energy consumption in the process of manufacturing, transportation and installation, and realize the green manufacturing concept of simultaneous development of safety production and energy saving, large-scale design has become the leading development direction of atmospheric pressure storage tank.   At present, the com...

Liquid appears too early in the liquid purifier, which means that the liquid purifier is connected too early. If the temperature condition of the switching heat exchanger has not been established, liquid will appear in the liquidator, which will result in the reduction of the flow gas of the switching heat exchanger due to the production of liquid, thus it is impossible to guarantee self-cleaning. Moreover, partial liquefaction of air will shrink the volume and reduce the pressure, thus increasing the positive flow air volume, which is not good for self-cleaning of switching heat exchanger. In addition, the backflow gas prematurely uses part of the cold energy for liquefaction, which will make the air in the switching heat exchanger can not be cooled to the working temperature as soon as possible, and even the temperature may rise. In this way, more carbon dioxide will be brought into the tower. Therefore, it is unfavorable for the liquid purifier to appear liquid too early. During ...

The forced valve of the Oxygen concentrator located separately on the upper and lower towers of the air separation unit fails, which causes changes in the tower