High purity nitrogen air separation FAQ

Why is there water analysis after the air is compressed and cooled by the air separation equipment

Carbon molecular sieve (CMS) is a new type of non-polar adsorbents, which has the performance of absorbing oxygen molecules in the air under normal temperature and pressure, thus obtaining nitrogen-rich bodies. The most remarkable feature of adopting the new nitrogen production technology of carbon molecular sieve pressure changing absorption method is: the impurity content of N2 product is low, the concentration of N2 and the gas volume can be adjusted arbitrarily according to the need, and high purity N2 with O2 content less than 5PPm and dew point less than-60℃ can be obtained through refining. In 1960s, carbon molecular sieve was firstly manufactured successfully in America and was promoted and applied soon. At first, carbon molecular sieve was used as the absorbant to separate oxygen from the air, and later it was gradually applied to the equipment for producing nitrogen. By the end of 1970s S and the beginning of 1980s S, the demand for nitrogen in various countries around the...

The liquid nitrogen supercooler uses the low temperature gas nitrogen from the upper tower to cool the liquid nitrogen from the lower tower, so as to reduce the gas rate when the liquid nitrogen throttling enters the upper tower. Why is the temperature of gas nitrogen lower than that of liquid nitrogen? This is because for the same substance, phase change temperature (saturation temperature) is related to pressure. The lower the pressure is, the lower the corresponding saturation temperature is (see Figure 8 ). On the top of the tower, it is in the saturated state of the coexistence of gas nitrogen and liquid nitrogen, both of which have the same saturation temperature. The absolute pressure of nitrogen going out of the tower is about 0.13MPa, and the corresponding saturation temperature is-193℃, which is also the temperature of the nitrogen saturated vapour going out of the tower. The absolute pressure on the top of the lower tower is about 0.55MPa, and the corresponding nitrogen s...

As for the oxygen generator in the flow of switching heat exchanger, in order to achieve the self-elimination of moisture and carbon dioxide, the amount of dirt and nitrogen is relatively large, so the condition of not freezing can be guaranteed. Therefore, the amount of pure gas and nitrogen products is relatively small, it can only reach 1.3 times of the output of gas and oxygen at most, so the amount of pure liquid nitrogen provided by the lower tower is less, so a stream of sewage nitrogen can be extracted to the upper tower, which increases the reflux ratio of the distillation section of the upper tower, it has greater rectification potential, thus allowing more inflated air to enter the upper tower to prevent inflated air from passing by and affecting oxygen extraction rate. As for the oxygen generator in the process of purification, pressurization and expansion of molecular sieve, the quantity of pure gas and nitrogen products has been greatly increased due to the lack of sel...

The advantage of using this process design is that the nitrogen cycle compressor and the medium/high/ultra-high pressure product nitrogen press are combined into one machine, eliminating the need to use multiple product nitrogen presses. Due to the high nitrogen to oxygen ratio, a portion of the nitrogen must be extracted from the top of the low pressure tower to make up the nitrogen cycle compressor. This make-up compressor is also combined with the low-pressure/low-pressure product nitrogen pr...

When the demand for oxygen increases higher than the normal working condition, more liquid oxygen is extracted from the liquid oxygen storage tank, pressurized to the required pressure by the liquid oxygen pump and sent into the main heat exchanger after gasification and reheating, and the liquid oxygen stored in the liquid oxygen storage tank is consumed. At the same time, the flow of low-pressure expander will be reduced, and more cold volume will be recovered by high-pressure nitrogen and the...

Why is the lowest temperature in the tower of an air separation plant lower than the outlet temperature of the expander

What factors are related to the operating cycle of air separation equipment

The principle and characteristics of large air separation cryogenic nitrogen production Nitrogen is the main component of air, accounting for about 78% of air. With the progress of science and technology and economic development, the application of nitrogen is expanding and has penetrated into many industrial sectors and daily life. There are several main methods of producing nitrogen. One of them is cryogenic air separation nitrogen, which is a traditional method of nitrogen production and ha...

What are the requirements for selecting materials for high purity nitrogen gas distribution pipelines in small air separation unit?   High purity nitrogen gas has to be transported through pipelines to the point of use of the small air separation unit. In order to meet the quality requirements of the gas for the process, the selection of materials for the piping system and the quality of construction need to be paid more attention to during the construction process, provided that the gas ...

According to the different ways in which refrigeration causes low temperatures, the cooling capacity can be divided into three ways

Because gas and liquid nitrogen are in a coexisting saturated state and have the same saturation temperature. However, saturated liquid and saturated vapour at the same temperature belong to different states. A saturated vapour gives off heat to condense into a saturated liquid, and when the temperature remains constant, the saturated liquid absorbs heat to evaporate into a saturated vapour. For the sa...