How is nitrogen prepared in a specialty gas manufacturer in China? Industrial nitrogen is mainly obtained by separating it from the atmosphere or through the decomposition of nitrogen-containing compounds. Every year, over 33 million tons of nitrogen are produced through liquefied air technology, and then nitrogen and other gases are produced in the atmosphere using the distillation method. For more detailed information, please refer to the article written by the editor.
Since the boiling points of industrial nitrogen and oxygen are not significantly different, liquid air and gaseous air need to undergo repeated evaporation, condensation, and re-evaporation processes (this process is called low-temperature distillation) until the gaseous fraction at the top of the purification tower can obtain higher purity nitrogen. The purity of the nitrogen depends on the number of tower plates and the distillation efficiency of the distillation tower!
The deep cooling separation process has undergone over 100 years of development, and has successively gone through various different process flows such as high pressure, high-low pressure, medium pressure and fully low-pressure processes. With the development of modern air separation technology and equipment, the high pressure, high-low pressure and medium pressure air separation processes have basically been eliminated, and the fully low-pressure process, which has lower energy consumption and safer production, has become the choice for large and medium-sized cryogenic air separation units.
How is nitrogen produced in a specialty gas manufacturer in China? The full low-pressure air separation process is divided into external compression process and internal compression process based on the different compression stages of oxygen and nitrogen products. The full low-pressure external compression process produces low-pressure oxygen or nitrogen, which is then compressed to the required pressure by an external compressor and supplied to users. The full low-pressure internal compression process vaporizes the liquid oxygen or liquid nitrogen produced by distillation in a cold box through liquid pumps to the required pressure for users, and then re-heats it in the main heat exchanger before supplying it to users. The main process steps are raw air filtration, compression, cooling, purification, pressurization, expansion, distillation, separation, re-heating, and external supply.
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