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Home > Products > Ungrouped > ASU Air Gas Separation Plant Liquid Nitrogen Plant

ASU Air Gas Separation Plant Liquid Nitrogen Plant

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USD $19,000 - $350,000 / Set

1 Set(Min.Order)

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Product Details

Brand Name	SEFIC		Place of Origin	Shanghai, China
Certification	ISO CE
Warranty	1 Year		Weight	Actual Weight)
Dimension(LWH)	Actual Size)		Condition	New
Voltage	380V/50HZ		Usage	Oxygen
Production Rate	99.999

Product Description

1. Liquid Nitrogen Plant

2. ASU Induction: An air separation plant separates atmospheric air into its primary components, typically nitrogen and oxygen, and sometimes also argon and other rare inert gases.

3. Production Process:

To achieve the low distillation temperatures an air separation unit requires a refrigeration cycle that operates by means of the Joule–Thomson effect, and the cold equipment has to be kept within an insulated enclosure (commonly called a "cold box"). The cooling of the gases requires a large amount of energy to make this refrigeration cycle work and is delivered by an air compressor. Modern ASUs use expansion turbines for cooling; the output of the expander helps drive the air compressor, for improved efficiency. The process consists of the following main steps

a.Before compression the air is pre-filtered of dust.

b.Air is compressed where the final delivery pressure is determined by recoveries and the fluid state (gas or liquid) of the products. Typical pressures range between 5 and 10 bar gauge. The air stream may also be compressed to different pressures to enhance the efficiency of the ASU. During compression water is condensed out in inter-stage coolers.

c.The process air is generally passed through a molecular sieve bed, which removes any remaining water vapour, as well as carbon dioxide, which would freeze and plug the cryogenic equipment. Molecular sieves are often designed to remove any gaseous hydrocarbons from the air, since these can be a problem in the subsequent air distillation that could lead to explosions. The molecular sieves bed must be regenerated. This is done by installing multiple units operating in alternating mode and using the dry co-produced waste gas to desorb the water.

d.Process air is passed through an integrated heat exchanger (usually a plate fin heat exchanger) and cooled against product (and waste) cryogenic streams. Part of the air liquefies to form a liquid that is enriched in oxygen. The remaining gas is richer in nitrogen and is distilled to almost pure nitrogen (typically < 1ppm) in a high pressure (HP) distillation column. The condenser of this column requires refrigeration which is obtained from expanding the more oxygen rich stream further across a valve or through an Expander, (a reverse compressor).

e.Alternatively the condenser may be cooled by interchanging heat with a re boiler in a low pressure (LP) distillation column (operating at 1.2-1.3 bar abs.) when the ASU is producing pure oxygen. To minimize the compression cost the combined condenser/reboiler of the HP/LP columns must operate with a temperature difference of only 1-2 degrees Kelvin, requiring plate fin brazed aluminum heat exchangers. Typical oxygen purities range in from 97.5% to 99.5% and influences the maximum recovery of oxygen. The refrigeration required for producing liquid products is obtained using the JT effect in an expander which feeds compressed air directly to the low pressure column. Hence, a certain part of the air is not to be separated and must leave the low pressure column as a waste stream from its upper section.

f.Because the boiling point of argon (87.3 K at standard conditions) lies between that of oxygen (90.2 K) and nitrogen (77.4 K), argon builds up in the lower section of the low pressure column. When argon is produced, a vapor side draw is taken from the low pressure column where the argon concentration is highest. It is sent to another column rectifying the argon to the desired purity from which liquid is returned to the same location in the LP column. Use of modern structured packings which have very low pressure drops enable argon purities of less than 1 ppm. Though argon is present in less to 1% of the incoming, the air argon column requires a significant amount of energy due to the high reflux ratio required (about 30) in the argon column. Cooling of the argon column can be supplied from cold expanded rich liquid or by liquid nitrogen.

g.Finally the products produced in gas form are warmed against the incoming air to ambient temperatures. This requires a carefully crafted heat integration that must allow for robustness against disturbances (due to switch over of the molecular sieve beds). It may also require additional external refrigeration during start-up.

4. ASU Specification:

AIR SEPARATION PLANT SPECIFICATIOIN TABLE
MODEL CONTENTS		KDON-200Y/200Y	KDON-500Y/500Y	KDON-1000Y/1000Y	KDON-1500Y/1500Y	KDON-2000Y/2000Y	KDON-3000Y/3000Y	KDON-4500Y/2000Y
LOX flow	Nm3/h	200	500	1000	1500	2000	3000	4500

LOX purity	%(O2)	99.6	99.6	99.6	99.6	99.6	99.6	99.6

LIN flow	Nm3/h	200	500	1000	1500	2000	3000	2000

LIN purity	%(N2)	99.999	99.999	99.999	99.999	99.999	99.999	99.999

LAr flow	Nm3/h	-	-	25	40	55	95	145

LAr flow	%(Ar)	-	-	99.999	99.999	99.999	99.999	99.999

Star-up time	(h)	8~12	~20	~24	~24	~24	~24	~24

Operating period	(Y)	≥1	≥1	≥2	≥2	≥2	≥2	≥2

5. Applications:

Large amounts of oxygen are required for coal gasification projects; cryogenic plants producing 3000 tons/day are found in some projects. In steelmaking oxygen is required for the basic oxygen steelmaking. Large amounts of nitrogen with low oxygen impurities are used for inerting storage tanks of ships and tanks for petroleum products, or for protecting edible oil products from oxidation.

6. Contact me for more details of ASU Plant, we provide design drawing and installation service.

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Acetylene cylinder	Argon cylinder	CO2 cylinder	Cylinder Bundle
Gas Product	Helium cylinder	Nitrogen cylinder	Other Cylinders
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