Air separation technology for mainly producing high-purity nitrogen and accessorily producing liquid oxygen by using cryogenic air separation device
A technology for separating equipment and cold air, applied in the field of air separation process, can solve the problems of high consumption of air, complex process, no energy saving, etc., to achieve the effect of small footprint, simple process and reduced power consumption
Active Publication Date: 2014-08-06
苏州制氧机股份有限公司
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Problems solved by technology
However, cryogenic liquids have advantages in storage and transportation, so there are more and more demands for cryogenic liquid nitrogen and liquid oxygen. The conventional air separation and liquefaction process occupies a large area and is complex in process. Only gas and oxygen can be separated, and the air consumed More, no energy saving
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Embodiment Construction
[0009] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to make a clearer and clearer definition of the protection scope of the present invention.
[0010] Please refer to Fig. 1, an embodiment of the present invention includes:
[0011] An air separation process for cryogenic air separation equipment that mainly produces high-purity nitrogen and produces liquid oxygen. The process steps are: (1) The raw material air passes through an air filter to remove dust and mechanical impurities, enters the air compressor and is compressed to the Need pressure; (2) The compressed air enters the molecular sieve purifier which is automatically switched after being cooled by the pre-cooling unit to remove H2O, CO2, C2H2 and other hydrocarbons. The air temperature out of the molecular sieve ...
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The invention discloses an air separation technology for mainly producing high-purity nitrogen and accessorily producing liquid oxygen by using a cryogenic air separation device. The air separation technology comprises the following steps: after purifying raw air through a filter, dividing the raw air into three paths; causing the first path of the raw air to directly enter into a cold box, exchanging the heat of the raw air through a main heat exchanger and backflow air, cooling the raw air to be at liquefied temperature, causing the raw air to enter into a nitrogen tower and participate into rectification, thereby obtaining pure nitrogen and liquid nitrogen products; cooling the second path of the raw air after being boosted by a turbine expansion machine, causing the raw air to enter into the main heat exchanger and cooling the raw air to be at the liquefied temperature, causing the raw air to enter into the nitrogen tower and participate into the rectification, thereby obtaining pure nitrogen and air rich in liquid oxygen; causing a part of the raw air to enter into an oxygen tower and re-separating the air rich in liquid oxygen participated into the rectification by the oxygen tower, and then reheating through a sub-cooler and the main heat exchanger, and taking out of a fractionating column; obtaining a liquid oxygen product at the bottom of the oxygen tower; and causing less third path of air to enter into an instrument air system and taking as instrument air and sealing air. In such a mode, the air separation technology provided by the invention has the advantages that the technology is simple, the occupied space is less, the extraction ratio of liquid products is increased, 20% of air consumption is reduced, the electric consumption is reduced and the liquid oxygen is accessorily produced under the condition of producing the high-purity liquid nitrogen.
Description
Technical field [0001] The invention relates to the field of nitrogen and oxygen production, in particular to an air separation process in which a cryogenic air separation device mainly produces high-purity nitrogen and concurrently produces liquid oxygen. Background technique [0002] The main products of air separation equipment are oxygen and nitrogen. Oxygen is a substance that all living organisms on the earth depend on for survival. It is easy to oxidize with other substances and release a lot of heat. Therefore, oxygen as an oxidant and combustion-supporting agent is widely used in metallurgy, chemical industry, energy, machinery, defense industry and other sectors. Nitrogen is chemically inactive, it is very inert under normal conditions, and it is not easy to chemically react with other substances. Therefore, nitrogen is widely used as a protective gas in metallurgy and electronic chemical industries. Cryogenic liquid has advantages in storage and transportation, so t...
Claims
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IPC IPC(8): F25J3/04
Inventor 俞士良缪华
Owner 苏州制氧机股份有限公司