KDN-550Y-40Y nitrogen or hydrogen fuel cell of hydrogen inhalation machine
Product parameters of ASU
|
Product
|
Output
|
Purity
|
Pressure at cold box outlet
|
|
GAN |
550NM3hr |
≤1 ppmO2 |
0.6 MPa (g) |
|
LIN |
40NM3hr |
≤1 ppmO2 |
0.6 MPa (g) |
1.0 Process introduction
This plant uses single column waste gas expansion process to produce partial liquid nitrogen together with nitrogen of 0.6MPa.
Feed air is compressed to 0.7 MPa(g) by air compressor. Then it enters pre-cooling unit and water separator to decrease dew point to about 10℃ and remove moisture.
Process air with 10℃ dew point enters purifier to remove residual moisture and CO2. Moisture and CO2 content out of purifier are both less than 1PPm.
After purification, the process air enters cold box and is cooled down to dew point temperature in the main heat exchanger. Then it enters the bottom of rectification column. One part of high purity nitrogen from top of rectification column enters main heat exchanger, and it is reheated as product nitrogen out of cold box when cooling feed air. The other part is divided into two streams after liquefied into liquid nitrogen in the condensing-evaporator. One stream works as reflux sent back to top of rectification column, and the other stream works as product liquid nitrogen out of cold box.
Oxygen enrichment liquid air made from bottom of rectification column is sent to evaporation passage of condensing-evaporator after throttling. It is evaporated automatically when condensing nitrogen in the condensing-evaporator and then enters to main heat exchanger. Oxygen-enriched air enters expander after reheating in the lower heat exchanger. Then cryogenic expansion oxygen-enriched air enters main heat exchanger to cool down feed air and be reheated to ambient temperature out of cold box. This waste gas after expansion and reheating works as regeneration gas of purifier.
Expander basically provides cooling energy for air separation and liquefaction.
3.0 Equipment performance
Start-up time 12 Hr
Warm-up time 24 Hr
Big warm period 1 Yr
4.0 Installed capacity, cooling water
4.1 Installed capacity
Air compressor (screw type) 200 Kw
Electric heater 48 Kw
Pre-cooling unit 10.5 Kw
Total 258.5 Kw
4.2 Cooling water
Recycle cooling water requirement:
Inlet water pressure 0.4 MPa
Inlet water temperature ≤ 32 ℃
Return water pressure ≤ 0.1 Mpa
5.0 Scope of supply
5.1 Oil free screw air compressor
Name oil free screw air compressor Quantity(unit) 1
Type ZR200
Equipment performance
Discharge capacity 1680 NM3/hr
Discharge pressure 0.7 MPa(g)
Electric motor power 200 Kw
Voltage/ Frequency 380/3/50 V/φ/Hz
Rotation speed 2975 r/min
Water consumption 30 T/hr
Size(L X W X H mm) 3000 x 1990 x 1631
Weight (Kg) 3820
5.2 Pre-cooling unit
Name Pre-cooling unit Quantity(unit) 1
Type UF-2000/8
Equipment performance
Process air capacity 2000 Nm3/hr
Design pressure 0.8 MPa(g)
Air temperature into pre-cooling unit ≤ 42 ℃
Air temperature out of pre-cooling unit ≤ 10 ℃
Type of refrigeration unit BY151H
Refrigeration coldness 45 kW
Refrigerant R134a
Power of motor 7.5 KW
Cooling water consumption 7.5 T/hr
Thermal expansion valve, heat pass by valve etc. main refrigeration components are provided by Danfoss company ( Danmark ).
Essential machines: condensing compressor unit, evaporator, water separator, pipelines and valves
5.3 Purification unit
Name Purification unit Quantity (unit) 1
Type HXK-2000/8
Equipment performance
Process air capacity 2000 Nm3/hr
Design pressure 0.8 MPa(g)
Out of purifier
H2O ≤1 ppm
CO2 ≤1 ppm
Electric furnace power 48 Kw
Adsorption period 8 hr
Switch way auto
Essential machines: Adsorber, electric heater, valve, powder filter, pipeline and molecular sieve etc.
5.4 Gas supply system for expander bearing gas, seal gas and instrument gas 1set
(1)Function
Provide dry bearing gas, seal gas and instrument gas for plant, with quality as follows:
Pressure 0.45 MPa
Dew point -60 ℃
Mechanical impurity < 5
Filter
Refined filter
Adjust valve and pipeline etc.
5.5 Rectifying column
Name Rectifying column Quantity(unit) 1
Type FN-550/40Y
Equipment performance
Process air capacity 1850 Nm3/hr
Option 1:
Output of nitrogen 550 Nm3/hr
Pressure out of cold box 0.6 MPa (g)
Purity ≤1 ppm O2
Output of liquid nitrogen 40 NM3/hr( equal to 65 L/hr)
Pressure out of cold box 0.6 MPa (g)
Purity ≤1 ppm O2
Option 2:
Output of nitrogen 650 Nm3/hr
Pressure out of cold box 0.6 MPa (g)
Purity ≤1 ppm O2
Main heat exchanger 1 group
Main evaporator condenser 1unit 1 set
Rectifying column 1 unit
Valve and pipeline 1 set
Cold box 1 unit
Outline size(L x W x H mm) 2600 x 2400 x 14000
Weight ( kg) 18000
5.6 Turbine expander
Name Turbine expander Quantity(unit) 2
Type PLPK-20x2/4.8-0.4
Equipment performance
Pressure before expansion 4.8 barg
Pressure after expansion 0.4 barg
Expansion capacity 1200 Nm3/hr
Temperature before expansion -152 ℃
Adiabatic efficiency > 0.80
Outline size (L x W x H mm) 600 x 400 x 400
Weight( kg) 80
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