High purity nitrogen air separation FAQ

In 1978, Chinese air separation industry successfully developed and produced the first set of high-purity nitrogen air separation plant. Up to now, the research and development and manufacturing of nitrogen production equipment have achieved leapfrog development in recent decades, and the production technology of high-purity nitrogen equipment has become increasingly mature and has fully realized localization.

In order to reduce the installation cost of the equipment, more and more air separation users require the cold box to be assembled when delivered from factory. The cold box packaging is to reasonably divide the functional modules in the design, complete the equipment manufacturing in the factory, and complete the product delivery in the form of modularization. Compared with the equipment parts leaving factory and on-site installation, the overall cold box can make full use of the perfect hardware facilities and good construction environment in the manufacturing plant, greatly reduce the on-site workload, improve the product quality control, speed up the construction progress and reduce the manufacturing cost.

A steel-making user of DEAR air separation set up their air separation plant in the early stage. At that time, due to the small amount of nitrogen required by the process and in order to reduce the investment, the molecular sieve adsorption purification process of 1:1 oxygen and nitrogen was adopted. There was no water chiller equipped, and a large amount of crude nitrogen was extracted to the water cooling column to reduce the temperature of cooling water.

Since the first set of high-purity nitrogen air separation equipment was developed and produced in 1978 in China's air separation market, the demand of domestic nitrogen market is growing due to economic development . The research and development and manufacturing of nitrogen production equipment have made a leap forward development in recent decades, and the production technology of high-purity nitrogen equipment has become increasingly mature and has fully realized localization.

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.