High purity nitrogen air separation FAQ

to increase oxygen extraction rate.The advantages and disadvantages of nitrogen expansion are:1) The gas does not enter the upper column after nitrogen expansion, so it will not directly affect the distillation conditions of the upper column. Its superheat degree after expansion can be higher than that of air expansion, and the pressure after expansion can also be lower than that of air expansion. Therefore, the unit cooling capacity is greater than that of air expansion. Under certain condition...

When the small oxygen generator uses liquid nitrogen throttle to adjust the purity of liquid nitrogen, it can be found that the valve is adjusted within a certain opening range, which has little effect on the purity of liquid nitrogen; while in a certain position, valve opening changes by 1 ° ~ 2 °, the purity of liquid nitrogen will change greatly. That is to say, the opening of liquid nitrogen throttle and the change of liquid nitrogen purity are not a simple proportional relationship, but the most sensitive position of adjustment. This phenomenon has a lot to do with the structure of the top of the lower tower. The top of the lower tower is connected with the main cooling. Nitrogen rises into the main cooling tube and condenses into the liquid nitrogen downstream. The liquid nitrogen connection tank is set at the lower part of the main cooling. The liquid nitrogen in the liquid nitrogen tank flows to the top tower through the liquid nitrogen tube, and the condensate liquid nitrog...

The process of using nitrogen as the working medium of expansion machine is called nitrogen expansion. Nitrogen expansion is divided into pure nitrogen expansion and dirty nitrogen expansion. Pure nitrogen expansion process is to extract pure nitrogen from the top of the lower tower and the top of the nitrogen side of the main condenser, a part of which is reheated through the circulation channel of the switching heat exchanger and then converged into the turbine expansion machine, after expansion, nitrogen is led out by Plate-fin Heat Exchanger as product nitrogen. Sewage nitrogen expansion process, which is to extract sewage nitrogen containing about 1% oxygen from the middle of the lower tower, part of which is reheated through the circulation channel of switching heat exchanger and then converge into the turbine expansion machine, after expansion, the sewage nitrogen is reheated through the cooling liquid purifier and switching heat exchanger to recover the cooling energy, and t...

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According to different applications, nitrogen products are divided into three kinds: industrial gas nitrogen, pure nitrogen and high purity nitrogen.

For the maintenance of nitrogen-water precooling system, the most important thing to pay attention to is to prevent the occurrence of nitrogen suffocating accident. There have been several lessons that maintenance workers died of nitrogen suffocating in China. During the overhaul, nitrogen is often used to warm the unit at the same time, and the heated nitrogen often flows into the cooling tower through the three-way valve of dirt and nitrogen, causing the nitrogen concentration in the tower to be too high. Therefore, before heating the device, the air cooling tower and water cooling tower should be separated from the device by blind plate; the oxygen content in the air cooling tower and water cooling tower should be analyzed. When the oxygen content is 19% ~ Only between 21% can the maintenance personnel be allowed to enter; if they work in the area where the oxygen content is less than 19%, there must be someone to supervise and wear isolation masks (oxygen respirator, long tube m...

What should be paid attention to during the switching operation of molecular sieve adsorbers in air separation equipment

What issues should be paid attention to when operating the molecular sieve purification system of the air separation equipment

When air enters into the cooler (or switching heat exchanger) through the last stage cooler of air compressor and nitrogen water precooler, the content of water vapor in the air has reached the saturated state. After that, with the decrease of temperature, the corresponding pressure of saturated water vapor is decreasing; the content of saturated water per cubic meter of air is gradually decreasing. For example, when the temperature drops from 30℃ to-60℃, the saturated moisture content in the air decreases from 30.3g/m3 to 0.011g/m3. The extra water is precipitated on the stuffing of the cooler or the fin of the Plate-fin Heat Exchanger. At-60℃, the saturated water vapor pressure has decreased to 1.067 Pa, which can be considered as no water, so 30℃ to-60℃ is called the water precipitation area. The "three-phase point" of water (the state of the coexistence of gas phase, liquid phase and solid phase) pressure is 0.613kPa, and the temperature is 0.01 ℃. When the partial pressure of t...