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1.1 Atmospheric conditions of the design points
Atmospheric Pressure                                          101.3kPa(A)
Atmospheric Temperature                                     30℃
Relative Humidity                                               75%
Atmospheric oxygen content                                  20.95%O2

1.2 Raw material conditions of air impurities:
CO2                                                                    ≤350 ppm
SO2                                                                                                                                         ≤0.44 mg/m3
H2S                                                                    ≤2.3 mg/m3
CH4                                                                    ≤5.2mg/m3
C2H2                                                                   ≤0.03 ppm
CnHm(Except C2H2)                                         ≤5 ppm
Dust concentration                                                ≤10mg/m3

1.3  Power condition                                                                                                            

High Voltage Power Supply                          10,000V±5%Three-phase three-wire
Low Voltage Power Supply                           380V/220V±5%AC Three-phase four-wire
Frequency                                                   50±0.5Hz

    Total installed capacity                                            ～1300KW(Nameplate power)

2.1 Output and purity(outlet cold box)

Design condition

	Output(Nm3/h)	Purity	Pressure(Mpa,G)	Temp.(℃)
Liquid Oxygen	720	99.6%O2	～0.16	-177
Gaseous Nitrogen	1,500	≤10ppm O2	～0.008	37

Second design condition

	Output(Nm3/h)	Purity	Pressure(Mpa,G)	Temp.(℃)
Liquid Nitrogen	720	≤10ppm O2	～0.2	-192

u  Remark:Nm3/h means under 0℃,760mmHg

2.2    Raw air compressor data:
 Air compressor design discharge capacity   ～9,000Nm3/h
 Air compressor discharge pressure                            ～1.1Mpa(A)

2.3    Operation period between two defrosting times          >2 Years

2.4    Defrosting time                                                     ～36 Hours

2.5    Starting Time                                                       ～24 Hours

2.6    Total electricity consumption                     1,157 kW

3. Process

KDON-720Y/1500 air separation plant is based on the different boiling points of each components in the air. The air firstly is pressed, precooled, and got removal of H2O and CO2. After cooling in the medium pressure heat exchanger until reaching to the liquefaction temperature, it rectifies in the column to get liquid oxygen and liquid nitrogen.

This plant is molecular sieve purifying air with turbo expander process.

After being removed dust and mechanical impurity in the air filter, raw air goes to the air turbine compressor to press the air to 1.1MpaA, and cooled until 10℃ in the air precooling unit. Then it enters into alternate working molecular sieve absorber to remove the H2O,CO2,C2H2.  The clean air is pressed by the expander and goes into the cold box. The presses air can be separated to 2 sections. After being cooled to 256K, one section is draw out to freezing unit 243K, then it is continuously cooled in the main heat exchanger. The cooled air will be draw out to the expander, and a part of expanded air goes into the main heat exchanger to reheat, then it gets out of the cold box. And the other parts go to the upper column. The other section is cooled by counter flow, and goes to the low column after being expanded.

After air being primarily rectified, we can get liquid air, waste liquid nitrogen and pure liquid nitrogen in the low column. Liquid air, waste liquid nitrogen and pure liquid nitrogen sucked from th