Since the successful development of the first set of high-purity nitrogen air separation unit in China in 1978, the R & D breakthrough of domestic nitrogen production equipment has closely followed the pace of foreign countries, and has achieved leapfrog development in recent decades. At the same time, China's nitrogen production market also shows an upward trend year by year, and the demand for nitrogen product quantity and product purity have been further improved. At present, the equipment in the common nitrogen market can be fully localized, and the ultra-high purity nitrogen air separation unit is also a new challenge faced by the gas separation industry.
Pure nitrogen is mainly used in oil field nitrogen injection, petrochemical industry, synthetic fiber, synthetic ammonia, float glass, steel rolling and electronic industry. The scale of nitrogen production air separation unit for nitrogen injection in oil field is the largest. The scale of nitrogen production air separation unit for petrochemical industry, synthetic fiber, synthetic ammonia, float glass, steel rolling, etc. generally ranges from thousands to tens of thousands. The product purity is required to contain oxygen of 2 ∽ 100ppm, and the product pressure is generally 1.35 ∽ 31bar. Some equipment needs standby liquid nitrogen, which is required to ensure uninterrupted product supply. The scale of nitrogen production units in the electronic industry is small, generally from hundreds to thousands, but the product purity requirements are the highest. Generally, the oxygen content is required to be less than 1ppm, and there are high requirements for the content of CO and H2 in the product. The product pressure is 3 ∽ 10bar. The product supply is required to be uninterrupted and there is standby liquid nitrogen.
After decades of vigorous development, the nitrogen production industry has reached a new level in terms of scale and product requirements. DEAR air separation has developed a suitable nitrogen production process for products of different specifications.
