When a large amount of water is found flowing into the air separation tower, the air inlet valve of the air separation unit and the water supply valve of the air cooling tower should be closed while the air compressor is venting. The inlet water of the switching heat exchanger with the cold end at the top and the hot end at the bottom is easy to remove the fault, and it is not easy to cause serious freezing phenomenon. However, the accumulator with the hot end at the top and the cold end at the bottom is very afraid of water inflow. Once the water inflow is easy to cause freezing blockage, the only way is to stop heating and thawing.DEAR Biogas purification unit.In order to ensure continuous gas supply, more than two adsorption towers need to be used alternately. The method of regeneration can be heating to increase temperature (TSA) or reducing pressure (PSA). This method has the advantages of simple process, convenient operation and low operation cost, but it is difficult to obtain high purity product, and the oxygen purity of the product is about 93%. Moreover, it is only suitable for separation units with small capacity (less than 4000 m3 / h).
DEAR Biogas purification unit.When the oxygen yield decreases, the oxygen purity will increase, and the argon rich region will move up, that is, the argon content in the argon rich region of the distillation section will increase, while the argon content in the argon rich region of the stripping section will decrease. This is because on the same tray, the total content of oxygen, argon and nitrogen in the gas phase should be 100%, and the total content of oxygen, argon and nitrogen in the liquid phase should also be 100%.DEAR Biogas purification unit.The cooling of each equipment is carried out in stages, so the cooling is uniform and the thermal stress is small. In addition, in the second cooling stage, the cooling capacity of each equipment in the cooling tower is large, which makes the expander run for a long time at a higher inlet temperature, so as to give play to the large cooling capacity of the turbo expander at high temperature and shorten the start-up time.Maintain the water level of the air cooling tower; the water spray volume should not be too large; the water quality should meet the requirements, reduce the inlet water temperature and reduce the scale. In case of water inflow accident, the working condition of the air cooling tower should be dealt with first, the water supply of the water pump should be stopped, the water level of the air cooling tower should be lowered, and the normal working condition should be restored.
DEAR Biogas purification unit.The temperature of compressed air will rise. In order to reduce the energy consumption of compression, the temperature rise should be minimized. The air is usually cooled by an intercooler, and further compressed after the temperature is lowered. Generally, the temperature of air drops from about 150 ℃ to 40 ~ 50 ℃ after cooling, while the temperature of cooling water only rises about 10 ℃ after absorbing heat.DEAR Biogas purification unit.In order to maintain the stability of the working condition, the cooling capacity produced must first make up for the two cooling losses of running off and incomplete heat exchange. When the device has a small amount of low temperature leakage or other cold loss, the required cooling capacity increases. In addition, when part of the liquid products produced by the device are exported to the device, the cooling capacity Q0 brought by the low-temperature products also needs to produce more cooling capacity to make up.DEAR Biogas purification unit.If the liquefier appears liquid too early, it means that the liquefier is connected too early. If there is liquid in the liquefier before the temperature condition of the switching heat exchanger is established, the amount of backflow gas in the switching heat exchanger will be reduced due to the generation of liquid, so that the self cleaning can not be guaranteed.
