99.6% Air Separation Plant FON- 250-500 Industrial Oxygen Plant With Low Energy Consumption

1.1  Design basic conditions
Atmosphere pressure                                                0.1013Mpa (A)
Atmosphere tempt.                                                  30
Relative humidity                                                      80%
O2 contained in air                                                  20.95% O2

1.2   Cooling water

Feeding water:Tempt.                      30)

Pressure                        0.45MPa(G)

PH value                                     78

Fouling factor                                      0.0004m² .h/Kcal

Total hardness                                                                100mg/L

Turbidity                                                                       1030mg/L

1.3  Earth quake:                           6 degree

1.4  Sea level:                          50m

1.5  Impurity in atmosphere

CO₂                                  ≤350 ppm
SO₂                                                                    ≤0.44 mg/m³
H₂S                                  ≤2.3 mg/m³
CH₄                                  ≤5.2mg/m³
C₂H₂                                 ≤0.03 ppm
C_nH_m(excluding C₂H₂)                ≤5 ppm
Dust content                        ≤10mg/m³

1.5  Power supply
Low voltage                                          380V/220V±5%

AC,3-phase,4-wire
Frequency                      50±0.5Hz

    Loaded power                                                        220KW(Name plate power, not incl. O2 compressor)

2.  Main technical performance parameters

2.1 Product output,purity , pressure

O2 output                             250m³/h±5%

O2 purity                             ≥99.6%O₂

O2 pressure                           0.034MPa(G)

N2 output                             500m³/h±5%

N2 purity                             ≤10ppmO₂

N2 pressure                           0.012 MPa(G)

Product quantity status(at 0,101.325Kpa)

2.2 Start pressure                        0.65MPa(G)

2.3 Plant operation period(between two defrosting times)    12 months

2.4 Start time                            24 hours

2.5 Specific power                        0.65kWh/m³O₂(not incl.

O2 compressor)

3.Pocess description:

KDON-250/500 air separation plant is of low pressure process.

Raw air comes from air, goes through air filter for removal of dust and other mechanical particle and enters non-lub air compressor to be compressed by two stage compressor to approx. 0.65MPa(g).It goes through cooler and enters precooling unit to be cooled to 510. Then it goes to switch-over MS purifier for removal of moisture, CO2, carbon hydrogen.  Purifier consists of two molecular sieve filled vessels. One is in use while anther is under regeneration by waste nitrogen from the cold box and through heater heating.

After purified, small part of it is used as bearing gas for turbine expander, other enters cold box to be cooled by reflux(pure oxygen, pure nitrogen and waste nitrogen) in main heat exchanger. Part of air is abstracted from the middle part of main heat exchanger and goes to expansion turbine for production of cold. Most of expanded air goes through subcooler which is cooled by oxygen from upper column to be delivered to upper column. Small part of it goes through bypass to waste nitrogen pipe directly and is reheated to go out of the cold box. The other part of air continues to be cooled to near liquid air tempt to lower column.

In lower column