Heating device and heating method of oxygen generating expander

Abstract

The invention discloses a heating device and a heating method for an oxygen-making expander. The device comprises a heating gas pipeline system and an analyzing control module, wherein the heating gas pipeline system mainly comprises an air compressor, a pre-cooling system, a molecular sieve system, an air separating system, an instrument gas header pipe, a first expander, and a second expander; the analyzing control module mainly comprises a dew point analysis unit, a carbon dioxide analysis unit and an alarm control unit. The heating method mainly comprises the following steps: step1, starting the oxygen-making expander and adopting instrument gas as heating gas until the air separating system is normally put into operation, and gas products are generated; and step 2, after the air separating system is put into operation, adopting air as heating gas. According to the technical scheme disclosed by the invention, a raw material air heating gas source and an instrument gas heating gas source are combined and mixed, and corresponding heating gas is selected for different working conditions, so that heating is not limited by time and is not affected by shut-down of the air compressor, and nitrogen gas pipe network balance is not affected.

Description

technical field [0001] The invention relates to an air separation process for oxygen production, and more specifically relates to a heating device and a heating method for an oxygen production expander. Background technique [0002] The basic process principle of the existing oxygen generators using cryogenic technology is to conduct deep cooling and rectification of air through steps such as compression, expansion, and heat exchange, and use the different boiling points of each component to separate oxygen, nitrogen, and argon. product. The main process equipment includes: air compressor, pre-cooling system, molecular sieve system, booster turbo expander (referred to as "expander"), and air separation system. Among them, the expander is an extremely important process equipment and the main force for the start-up, operation and normal production of the entire oxygen generator, and its cooling capacity accounts for 85% of the cooling capacity required by the entire air separ...

AI Technical Summary

Problems solved by technology

[0005] 2) Due to the influence of airflow carrying effect and molecular sieve adsorption efficiency, the operating efficiency of the expander will decrease after a long period of operation. In order to prolong its service life, it must be heated and thawed

But there are other problems: 1) Nitrogen is a product of the oxygen generator, and the cost is higher than that of air; 2) Nitrogen is mainly supplied to users of the main operation line (such as cold rolling and hot rolling). When used for heating the expander, the pipe network The total amount of nitrogen in the medium decreases, which puts pressure on the balance of the system; 3) When the oxygen generator or nitrogen compressor malfunctions and trips or other unplanned shutdowns, the nitrogen output decreases and needs to be supplemented by liquid nitrogen evaporation. At this time, the operating cost will be greatly reduced. rise

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