High purity nitrogen air separation FAQ

What is the task of an air plant purification system?

Oxygen product: liquid oxygen is pumped out from the lower tower plate of the low pressure tower and sent to the storage tank, the inner compressed oxygen pump is placed next to the liquid oxygen storage tank, the liquid oxygen extracted from the storage tank is pressurized by the oxygen pump and sent out after gasification and reheating in the main heat exchanger to get the required oxygen product in liquid air separation plant. The nitrogen product is pumped from the top of the pressure tower...

As the air passes through the accumulator or the switching heat exchanger, water and carbon dioxide precipitate out and freeze on the packing of the accumulator or on the fins of the switching heat exchanger, and the return flow of dirty nitrogen takes away the deposited water and carbon dioxide when it passes through.   The dirty nitrogen from the upper tower of the distillation column contains essent...

What are the main functions, working principles, and processes of the pre cooling system for air separation equipment?

The method of nitrogen production in cryogenic air separation equipment

  The molecular structure of nitrogen is so stable that it is usually very difficult to react chemically with other substances and shows great inertness, so it is often used as a protective gas in industry. Nitrogen-filled storage of fruits and vegetables is an advanced method of storage and preservation, which allows fruits and vegetables to slow down their metabolism in an environment of high nitrogen and low oxygen, and to e...

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...