Three types of nitrogen production devices
There are three kinds of nitrogen production devices in industry, namely cryogenic air separation, molecular sieve air separation ( PSA ) and membrane air separation.
Nitrogen production by cryogenic air separation
Cold air separation is a traditional method of nitrogen production, which has a history of decades. It is based on air as raw material, after compression, purification, reuse of heat exchange so that the air liquefaction into liquid air. Liquid air is mainly a mixture of liquid oxygen and liquid nitrogen. Liquid oxygen and liquid nitrogen have different boiling points ( at 1 atmosphere pressure, the former boiling point is-183 °C, the latter is-196 °C ). Nitrogen is obtained by distillation of liquid air and separation of them. The cryogenic air separation nitrogen production equipment is complex, covers a large area, has a high infrastructure cost, a large investment in equipment, a high operating cost, a slow gas production ( 12 ~ 24h ), high installation requirements, and a long cycle. Comprehensive equipment, installation and infrastructure factors, equipment below 3500 Nm3 / h, the investment scale of the same specification PSA device is 20 % ~ 50 % lower than that of the cryogenic air separation device. Cryogenic air separation nitrogen plant is suitable for large-scale industrial nitrogen production, while medium and small-scale nitrogen production is not economical.
Nitrogen production by molecular sieve air separation
Compared with the traditional nitrogen production method, it has the advantages of simple process flow, high degree of automation, fast gas production ( 15 ~ 30 minutes ), low energy consumption, product purity can be adjusted according to the needs of users in a large range, convenient operation and maintenance, low operating cost, strong adaptability and so on. Therefore, it is quite competitive in the nitrogen production equipment below 1000Nm3 / h, and is more and more popular with small and medium-sized nitrogen users. PSA nitrogen production has become the preferred method for small and medium-sized nitrogen users.
Nitrogen production by membrane air separation
Using air as raw material, under certain pressure conditions, different gases such as oxygen and nitrogen have different permeation rates in the membrane to separate oxygen and nitrogen. Compared with other nitrogen production equipment, it has the advantages of simpler structure, smaller volume, no switching valve, less maintenance, faster gas production ( ≤ 3 minutes ), and convenient capacity increase. It is especially suitable for medium and small nitrogen users with nitrogen purity ≤ 98 %, and has the best functional price ratio. When the purity of nitrogen is more than 98 %, its price is more than 15 % higher than that of PSA nitrogen production equipment of the same specification.
The above is organized and released by the pressure swing adsorption nitrogen production device-Suzhou Jiarui gas. Suzhou Jiarui Gas System Co., Ltd.is a science and technology company specializing in the research and development of gas separation and purification technology. The company has a science and technology development building, gas separation device assembly plant. Provide users with pressure swing adsorption hydrogen production, nitrogen production, oxygen production, purification or removal of carbon dioxide and other services, looking forward to win-win cooperation with you.
