Nitrogen yield increasing method for use in air separation unit

Abstract

The invention relates to a nitrogen yield increasing method and device for use in an air separation plant, particularly to the improvement of a nitrogen water precooling system for use in the air separation plant. The nitrogen flow of the nitrogen water precooling system is reduced and the nitrogen is guided into a nitrogen compressor for future use. In order to enable gas entering into a molecular sieve absorption system to be without higher saturated water vapor, the absorption effect is reduced. The nitrogen yield increasing method improves the refrigerating capacity of a refrigerator and can reduce the temperature of the cooling water entering in an air cooling tower and the temperature of the air exiting from the air cooling tower, enhance the cooling effect of the air cooling tower and therefore increase the yield of nitrogen products. According to the nitrogen yield increasing method provided by the invention, the usage amount of air separation units can be reduced, and with respect to the increment of the usage amount or capacity of refrigerators although, more energy consumptions can be saved.

Description

technical field [0001] The invention relates to a method for increasing nitrogen production in an air separation plant, in particular to the improvement of the nitrogen water precooling system in the air separation plant. Background technique [0002] The method of separating nitrogen and oxygen from air is used in a wide range of fields such as iron making, chemical and electronic industries. Although the air separation system has developed to a highly mature level, it is aimed at improving the separation efficiency and reducing the operating cost. There are still many areas to be studied and improved, such as the improvement of operational stability, and the present invention is aimed at improving the actual operation to reduce the operating cost. [0003] like figure 1 Shown is the flow chart of air separation equipment in a known air separation plant. This air separation unit is an air separation equipment belonging to molecular sieve adsorption and hydrogen-free argon ...

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Problems solved by technology

Because the amount of saturated steam in the mixed nitrogen has an upper limit, the degree of water temperature reduction in the EC water cooling tower depends on the value of the water-air ratio, so that the degree of temperature reduction in the EC water cooling tower 3 is also limited Yes, it is necessary to use a larger flow rate of mixed nitrogen to improve the cooling effect of the EC water cooling tower 3. If the flow rate of the mixed nitrogen gas is reduced, the temperature of the cooling water exiting the EC water cooling tower 3 will increase, which will affect the SC air cooling. The air cooling effect in the tower 2, such as the cooling effect in the SC air cooling tower 2 is reduced, the air will have a higher temperature and saturated vapor pressure, so that the adsorption burden of the molecular sieve adsorber 4 will become heavier, thereby affecting air separation factory production capacity

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