100m3/h Medical Oxygen Plant Low Pressure Cryogenic Air Separation Plant

99.6% Air Separation Plant FON 100/250 Industrial Oxygen Plant With Low Energy Consumption

1.1 Atmospheric Design Condition
atmospheric pressure                                        101.3kPa(A)
atmospheric temperature                                  30℃
relative humidity                                              75%
atmospheric oxygen content                            20.95%O₂

1.2 Atmospheric temperature
annual average temperature                            18.4℃
extreme maximum temperature                      40℃
extreme minimum temperature                       -1.8℃
average temperature in summer                      30℃
average temperature in winter                        7.5℃

1.3  Seism:                                                            ＜6 Mercalli Scale   

1.4  Altitude:                                                           50m

1.5  Ambient air composition at the end-user’s site:
CO₂                                                                   ≤350 ppm
SO₂                                                                                          ≤0.44 mg/m³
H₂S                                                                    ≤2.3 mg/m³
CH₄                                                                   ≤5.2mg/m³
C₂H₂                                                                 ≤0.03 ppm
C_nH_m(excl. C₂H₂)                                       ≤5 ppm
dust content                                                     ≤10mg/m³

1.4  Circulating water
inlet water temperature                                    30℃
inlet water pressure                                          0.4 MPa(G)
maximum pressure drop                                   0.2 MPa(G)
maximum temperature rise                               10℃
cooling water turbidity                                    12 mg/L
PH value                                                          7.2
total rigidity                                                     2.5
furring factor                                                   0.0004 m² hºC/ k.W

     equipment water consumption  ～10T/h(excl. oxygen compressor)

1.5  Electricity supply
Low Voltage Power Supply     380V/220V±5% (ac three-phase    four-wire system)                                                     
frequency                                                   50±0.5Hz

 total Installation capacity                          ～115KW(nominal power,

excl.oxygen compressor)

2.1 production flow, purity & pressure

oxygen production                                             100m³/h±5%

oxygen purity                                                      ≥99.6%O₂

oxygen pressure                                                  ～0.034MPa(G)

nitrogen production                                            250m³/h±5%

nitrogen purity                                                    ≤10ppmO₂

nitrogen pressure                                                 ～0.012 MPa(G)

product status(0℃,101.325Kpa)

2.2startup pressure                                                      0.7MPa(G)

2.3 equipment operation cycle                                    12 months

2.4 startup time                                                           ～24hours

2.5 unit electrical consumption                           ～0.75kWh/m³O₂(excl. oxygen compressor)

   KDON-100/250 ASU adopts a complete low-pressure process, with detailed process description as follows:

Feed air is sucked into the air filter from the atmosphere, where the contents of dust and other mechanical impurities are being removed, before entering an oil-free air compressor, and through two stage compression, it is pressurized up to a pressure of ~0.7MPa (Gauge); upon being cooled in the after-cooler, it enters the pre-cooling unit where it is pre-cooled to a temperature of 5~10ºC, before being inlet to a switch-over molecular sieve adsorption unit, where the contents of moisture, CO2, hydrocarbons in the air are being adsorbed. Molecular sieve adsorption unit is made up of two vessels filled with molecular sieve: when one vessel is working, the other is being regenerated in an electrical heater for its molecular sieve by the waste nitrogen from the cold box.

The purified air, except that a small portion is used as bearing gas for airshaft expansion turbine, all the rest enters the cold box for air separation. In the main heat exchanger, it is cooled by gas refluxes (pure oxygen, pure nitrogen, & waste nitrogen, etc.) Part of air being withdrawn from the middle level of the main heat exchanger, enters expansion turbine for expansion and refrigeration. A major part of the expanded air thru expanding in the sub-cooler, is cooled by the oxygen in the LP column before sending to LP column. The remaining small part goes by-pass directly into the waste-nitrogen circuit, and then discharged out of cold box after being re-heated. Rest of the process air is continuously cooled in the main heat exchanger to reach close to liquefied air temperature before entering the MP column.

In the MP column, the air is being initially separated into nitrogen and oxygen enriched liquefied air. GAN is being condensed and liquefied in the main condenser, and meantime LOX at the low-pressure side of the main condenser is being vaporized. Part of LIN is used as MP column reflux, the remaining LIN is drawn from top of the MP column, and through liquefied air LIN subcooler, it is subcooled with pure nitrogen and waste nitrogen and throttled before being sent to top of the LP column. Liquefied air after being sub-cooled and throttled is being sent to middle level of the LP column as reflux.

Oxygen production is drawn at the lower level of the LP column, and thru expansion air sub-cooler and main heat exchanger reheating, it is then delivered out of the column. Waste nitrogen is drawn at the upper level of the LP column, and after being reheated in the sub-cooler and main heat exchanger, it is then delivered out of the column, with some part used as the regeneration gas for the molecular sieve adsorbers. Pure nitrogen is delivered at the top of the LP column, and thru reheating in the liquefied air / liquefied nitrogen subcooler and the main heat exchanger, it is delivered out of the column.

Oxygen out of the distillation column is pressurized by the oxygen compressor up to a specified pressure before being delivered to the end-user.

4.1,Air compressor(piston oil-free lubrication)      1 set

Model No.                                                        VHN-13/7

Discharge flow                                                13m³/min

Discharge pressure                                            0.7MPa(G)

Motor power                                                    75kW

Cooling water flow                                          ～3t/h

Cooling water temperature                              ≤30℃

Cooling water pressure                                    ≥0.3MPa

Supply Scope:

4.1.1 Motor                                                       1pc

4.1.2 Main body of air compressor                   1pc

4.1.3 Electrical control cabinet                         1pc

4.1.4 Spare parts                                               1set

4.1.5 The last afer-cooler                                  1pc

4.2,Air pre-cooling unit                          1set

Model No.                                                       GAYL-780/8

Discharge flow                                                780m³/h

Air inlet pressure                                              ≤0.8MPa(G)

Air inlet temperature                                        ≤40℃

Air outlet temperature                                     ～8℃

Motor power                                                     5kW

Circulation water inlet pressure                        ≥0.3MPa

Circulation water inlet temperature                  ≤30℃

Circulation water flow                                      5t/h

Supply Scope:

4.2.1 Import refrigeration compressor              1pc

4.2.2 Condenser                                                1pc

4.2.3 Vaporizer                                                  1pc

4.2.4 Piping valves                                            1set

4.2.5 Refrigeration auto-control element          1set

4.2.6 Electrical control board                           1set

4.2.7 Operation instrument panel                     1pc

4.2.8 Water separator                                        1pc

4.2.9 Liquid level alarm device                        1set

Note:above the pieces are of one integral case design.

4.3,Molecular purification system        1set 

  Model No.                                                          HXK-780/8

  Process airflow                                                  780m³/h

  Working pressure                                              0.8MPa

  Air inlet temperature                                         12℃

  Adsorption cycle                                                8h

  Regenerate air inlet temperature                       250℃

  Regenerate air outlet temperature                      100℃

Electrical heater power                                     30kW

Supply Scope:

4.3.1 Molecular sieve adsorption vessel     1 each on left&right (incl. M/S)

4.3.2 Electrical heater                                       1pc

4.3.3 Piping & Valves                   1set

Note: above pieces are of one integral skid design.

4.4,Distillation System                            1set

   Model No.                                                       FON-100/250

   Type                                                                2 stage distillation

   Process airflow                                                 640m³/h

   Oxygen production                                          100m³/h±5%

   Oxygen purity                                                 ≥99.6%O₂

Nitrogen production                                       250m³/h±5%

   Nitrogen purity                                                ≤10PPmO₂

   Overall dimension                                            2200×2300×14000mm

Supply Scope:

 4.4.1Main heat exchanger                                  1pc

4.4.2 Subcooler                         2pcs

 4.4.3 Main condenser-vaporizer            1 pc

4.4.4 Distillation column                               1pc

   4.4.5 Cold box shell/casing                                1pc

4.5,Expansion Turbine                           1 set in 2 pcs

  Model No.                                                              PLPK-4.67/6.2-0.5

  Flow                                                                      280m³/h

  Inlet temperature                                                    135K

  Inlet pressure/outlet pressure                               ～0.72MPa(A)/0.15MPa(A)

  Medium                                                                  Air

Type                                          Blower brakes & gas bearings

Adiabatic efficiency                                               ≥70%

Supply Scope:

4.5.1 Main body of expansion turbine         2pcs

4.5.2 Expansion bend                     4pcs

4.5.3 Expansion turbine inlet filter           2pcs

4.6,Piston Oxygen Compressor      1pcs (with water lubrication)

Model No.                           3Z3.5-1.67/150

Discharge flow                                          1.67m³/min

Discharge pressure                      15.0MPa

Inlet temperature                         30℃

Discharge temperature                    40℃

Cooling water flow                     ～3t/h

Cooling water temperature               ≤30℃ 

Cooling water pressure                  ≥0.3MPa

Motor power                            30kW

Supply Scope:

4.6.1 Main body of compressor                1pc

4.6.2 Cooler                                             1set

4.6.3 Electrical control cabinet              1pc

4.6.4 Motor                              1pc

4.7,Oxygen Bag(50m³)                            1pc

4.8,Oxygen Charging Equipment(24heads)           1set

4.9,Engineer Materials of Equipment                  1set

(pipe,engineering valve, cable, thermometer, etc.) 

4.10,Water Cooling System                           1set

(cooler,water pump,pipeline,valve etc.)      

4.11,Insulation                                     1set

(heat preservation cotton, pearled sand, etc.)

KDON - 100/250 oxygen plant