A Low Energy Consumption Medium Pressure Nitrogen Production Process

Abstract

The invention discloses a process for producing medium-pressure nitrogen with low energy consumption. The devices required for the production include filters, turbine air compressors, air pre-cooling units, molecular sieve adsorbers used alternately, electric heaters, and main heat exchangers. Refrigerator, cryogenic refrigerator, rectification column I, main condensing evaporator I, rectifying column II, main condensing evaporator II, booster turboexpander, booster turboexpander booster aftercooler, circulating nitrogen pressure machine, circulating nitrogen compressor aftercooler, liquid nitrogen pump, subcooler. Using the process of the invention to produce medium-pressure nitrogen has high extraction rate and low device energy consumption.

Description

technical field [0001] The invention relates to the technical field of air separation, in particular to a process for producing medium-pressure nitrogen with low energy consumption. Background technique [0002] With the technological development and innovation of chemical industry, electronics, new materials, porcelain steel industry, glass and other industries, the demand for nitrogen has increased rapidly, and at the same time, higher requirements have been put forward for the purity of nitrogen. [0003] The commonly used pure nitrogen equipment on the market is divided into two types: single-tower nitrogen production and double-tower nitrogen production. The single-tower nitrogen production can produce a certain pressure of product nitrogen directly for users to use. Although the structure of this process is simple, However, the extraction rate of the device is low, and the unit consumption of the product is high, which is not suitable for the large-scale use of nitroge...

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Problems solved by technology

[0003] The commonly used pure nitrogen equipment on the market is divided into two types: single-tower nitrogen production and double-tower nitrogen production. The single-tower nitrogen production is smooth and can produce a certain pressure of product nitrogen for direct use by users. Although this type of process is simple in structure, However, the extraction rate of the device is low, and the unit consumption of the product is high, which is not suitable for the large-scale use of nitrogen; the double-tower nitrogen production can produce nitrogen at atmospheric pressure or low-pressure nitrogen with a pressure of 0.1-0.2MpaG, and the extraction rate of the device is high. Energy consumption Lower than that of single tower nitrogen production, but due to the lower product pressure, it cannot directly meet the user's requirements for nitrogen pressure

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