Bang Intelligent

Cryogenic Air Separation Unit

CRYOGENIC AIR SEPARATION SERIES

Process Principle

The basic principle of air separation is use cryogenic rectification to condense air into liquid and separate the air according to the evaporation temperature of each component.The twostage rectification tower simultaneously obtains pure nitrogen and pure oxygen at the top and bottom of the upper tower. It is also possible to take out liquid oxygen and liquid nitrogen from the evaporation side and the condensation side of the main cooling respectively. The air separation in the rect ification toweris divided into two stages, airis separated forthefirsttime in the lowertower to obtain liquid nitrogen and at the same time obtain oxygen-enriched liquid air. The oxygenenriched liquid air is sent to the upper tower for rectification to obtain pure oxygen and pure nitrogen. The upper tower is divided into two sections: with the liquidair inlet as the boundary,the upper part is the rectification section, which rectifies the rising gas, recovers the oxygen component, and purifies the nitrogen purity, and the lower section is the stripping section to remove the nitrogen components in the iquid, separated to improve the oxygen purity of the iquid.

Process Flow

1. Air compressor (screw type): Uses air as raw material, collects and compresses air to 8 bar
2. Refrigerated dryer: Standard configuration removes moisture and impurities from the air, bringing the air dew point to -20℃ (intermediate configuration uses an adsorption dryer, bringing the dew point to -40℃); Advanced configuration uses a combined dryer (dew point reaches -60℃)

3. Precision filter: A/T/C three-stage filter removes oil, dust, and impurities.

4. Air buffer tank: Stores pure, dry air as raw material for subsequent adsorption and oxygen separation.

5. Adsorption tower: A & B adsorption towers can work alternately, regenerating adsorption and filling with sodium molecular sieves to filter out oxygen molecules.

6. Oxygen analyzer: Monitors and analyzes oxygen purity in real time, indicating normal equipment operation and triggering alarms.

7. Valves & pipelines: Intelligent control valves enable fully automatic equipment operation, PLC control, SUS304 pipelines.

8. Oxygen buffer tank: Stores qualified oxygen, which can be directly piped or bottled for use.

9. Pressure regulator: Adjusts and regulates the oxygen outlet pressure (3-6 Bar).

10. Dust filter: Removes dust from the molecular sieves in the oxygen.

11. Check valve: Preventing Oxygen Backflow

12. Booster: Oxygen booster, pressurizes oxygen to the filling pressure, typically 150 bar or 200 bar

13. Pressure Regulating Valve: Regulates the pressure of the oxygen compressor

14. Filling Drain: Distributes high-pressure oxygen to individual oxygen cylinders

Equipment + Process

1.Air Compressor Suction air

2.Precision Filter Removal dust and oil

3.Air Pre-cooler Reduce the air temperature to 5-8℃

4.Water Separator

5.Air Tank

6.Molecular Sieve Purifier

12.Gas Analyzer

11.Filling Device

10.Liquid Oxygen Pump

9.Turbo-expander

7.Precision Filter

8.Rectification Column(Cold Box)

13.Electrical & instrument control system

14.Oxygen cylinder

BWDN High Purity Nitrogen Air Separation Unit

High-purity nitrogen equipment can adoptforward flow and reverse flow, single-tower,double-tower and other process organizationmethods to meet the requirements of differentpressure levels of customers. The whole devicecan be controlled by DCS or PLC system.

Technical indicators

Nitrogen Purity	≥99.9997%	Raw Material Medium	Air
Phase State	Gas Phase	Temperature State	Normal Temperature
Operation Cycle	≥24 Months	Start Time	~12 Hours

Specifications Classification

Model	\ \ Unit	BWDN -200	BWDN -300	BWDN -400	BWDN -700	BWDN -1000	BWDN -1600	BWDN -3000
Nitrogen Production	Nm³/h	200	300	400	700	1000	1600	3000
Liquid Nitrogen Production	\ \ L/H	/	10	10	20	40	60	150
Nitrogen Purity	PPmO₂	≤3	≤3	≤3	≤3	≤3	≤3	≤3
Nitrogen Pressure	MPa.A	0.34~1	0.34~1	0.34~1	0.34~1	0.34~1	0.34~1	0.34~1
Device Occupied Area	m²	95	150	220	260	300	320	410

BWDO Cryogenic Oxygen Air Separation Unit

The cryogenic oxygen production & oxygen&nitrogen production process introduces a low-pressure process into the air separation equipment, which reduces the energy consumption of theair separation and improves the safety of operation, correspondina chemical software is used inprocess calculation and unit equipment design for process distillation calculation and structurecalculation to ensure advanced and reliable equipment.

The cryogenic oxygen production &oxygen&nitrogen production process introduces a low-pressure process into the air separation equipment, which reduces the energy consumption of theair separation and improves the safety of operation. Corresponding chemical software is used inprocess calculation and unit equipment design for process distillation calculation and structurecalculation to ensure advanced and reliable equipment.

The company designed and developed a skid-mounted purification system to minimize on-sitepiping installation time

Technical indicators

Name	Oxygen Gas	Pressure	20MpaG(Adjustable)
Purity	≥99.6%	Operation Cycle	12 Months
Start Time	~24 Hours	Single Column,Internal compression Process	Single Column,Internal compression Process

Name	Oxygen&Nitrogen Gas	Pressure	20MpaG(Adjustable)
Oxygen Purity	≥99.6%O₂	Nitrogen Purity	≥99.99%
Start Pressure	1.0MPaG	Double column,External compression Process	Double column,External compression Process

Specifications Classification

Model	Unit	BWDON -50-50	BWDON -80/160	BWDON -180-300	BWDON -260-500	BWDON -350-700	BWDON -550-1000-	BWDON -750-1500	BWDON 1200-3000-30Y
Oxygen Production	Nm³/h	50	80	180	260	350	550	750	1200
Oxygen purity	%O₂	≥99.6	≥99.6	≥99.6	≥99.6	≥99.6	≥99.6	≥99.6	≥99.6
Nitrogen Production	Nm³/h	50	160	300	500	700	1000	1500	2000
Nitrogen Purity	PPmO₂	≤10	≤10	≤10	≤10	≤10	≤10	≤10	≤5
Liquid Argon Production	Nm³/h	一	一	一	一	一	一	一	30
Liquid Argon Purity	PpmO₂+ PPmN₂	一	一	一	一	一	一	一	≤1.5PpmO₂ +4PPmN₂
Liquid Argon Pressure	MPa.A	一	一	一	一	一	一	一	0.2
Unit Consumption	Kwh/ Nm³O₂	≤1.3	≤0.85	≤0.68	≤0.68	≤0.65	≤0.65	≤0.63	≤0.55
Device Occupied Area	m²	145	150	160	180	250	420	450	800

BWDON Ar-Y Cryogenic Liquid Air Separation Unit

Liquid air separation equipment requires more coolingcapacity than gas air separation equipment.
According to the different production of liquid air separationequipment, we adopt a variety of different refrigeration cycleprocesses,turbine expander refrigeration, low temperaturepre-cooling refrigeration, circulating compressor high andlow pressure expander refrigeration, etc.,through variousmethods to achieve reduction Energy consumption goals.The control system adopts DCS or PLC control system, andauxiliary field instruments, so that the whole set ofequipmentis simple to operate, stable and reliable.

Specifications Classification

Model	\ Unit	BWDO -180y	BWDO -250y	BWDO -400y	BWDON- 1200y/300y	BWDONAR -1300y/200y/40y	BWDONAR -2700y/300y/90y
Liquid Oxygen Production	Nm³/h	180	250	400	1200	1300	2700
Liquid Oxygen Purity	%O₂	≥99.6	≥99.6	≥99.6	≥99.6	≥99.6	≥99.6
Liquid Oxygen Pressure	MPa.A	0.2	0.2	0.2	0.2	0.2	0.2
Liquid Nitrogen Production	Nm³/h	一	一	一	300	200	300
Liquid Nitrogen Purity	PPmO₂	一	一	一	≤5	≤5	≤5
Liquid Nitrogen Pressure	MPa.A	一	一	一	0.5	0.5	0.5
Liquid Argon Production	Nm³/h	一	一	一	一	40	90
Liquid Argon Purity	PpmO₂ +PPmN₂	一	一	一	一	≤1.5PpmO₂ +4PPmN₂	≤1.5PpmO₂ +4PPmN₂
Liquid Argon Pressure	MPa.A	一	一	一	一	0.2	0.2
Device Occupied Area	\ m²	250	300	350	850	-4000	-4500