Multifunctional nitrogen making device

Abstract

The invention relates to the technical field of nitrogen making, and relates to a multifunctional nitrogen making device. A part of purified air is fed to the bottom of a rectifying tower after heat exchange is carried out through a main heat exchanger, the other part of the purified air is pressurized through a supercharger, is cooled after heat exchange is carried out through the main heat exchanger and then is fed into an ET2 expansion machine to be refrigerated and fed into a waste nitrogen pipe network, oxygen-enriched liquid air is obtained at the bottom of the rectifying tower and is fed to the top of a condensing evaporator after passing through a liquid air subcooler and after throttling, liquid nitrogen in the condensing evaporator flows back to the top of the rectifying tower to serve as backflow liquid of the rectifying tower, waste nitrogen obtained on the top of the a lower pressure side of the condensing evaporator is fed into an ET1 expansion machine for expansion refrigeration, the reheated waste nitrogen is fed into a purifying system, high-purity nitrogen is obtained on the top of the rectifying tower, the high-purity nitrogen is output externally after being reheated by the main heat exchanger or after being reheated by the main heat exchanger and passing through the supercharger in sequence, and liquid nitrogen is output externally after high-purity liquid nitrogen passes through a liquid nitrogen subcooler. The multifunctional nitrogen making device has the advantages of being low in energy consumption, high in extraction ratio, good in economic benefit, flexible and reliable in adjustment and suitable for gas making industries.

Description

technical field [0001] The invention belongs to the technical field of nitrogen production, in particular to a nitrogen production device capable of greatly reducing energy consumption. Background technique [0002] With the rapid development of electronics industry, metallurgy, metal processing industry, chemical industry, new material industry and petrochemical industry, etc., the demand for nitrogen products is increasing, and the air separation equipment for nitrogen production is a large energy consumer. For long-term operation, how to effectively reduce energy consumption is very important. At present, the general practice is to partially expand, and the rest to throttle. The work output by the expander is used to pressurize and ventilated by fan braking; If the surplus is emptied, or if the output is insufficient, liquid nitrogen must be purchased to supplement the production. With these methods and process organization, the power supply of the power supply departmen...

AI Technical Summary

Problems solved by technology

At present, the general practice is to partially expand, and the rest to throttle. The work output by the expander is used to pressurize and ventilated by fan braking; If the surplus is emptied, or if the output is insufficient, liquid nitrogen must be purchased to supplement the production. With these methods and process organization, the power supply of the power supply department cannot meet the energy consumption requirements of the nitrogen-generating user's air separation equipment.

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