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^{ALPHA OVERSEAS}

NIROGEN GAS PLANT

ALPHA OVERSEAS's NITROGEN GAS PLANT

Brief History of Air Separation

In 1893, Linde discovered that the liquefication temperature of air can be obtained by means of direct throttling of compressed air as per Joules-Thomson effect, if the temperature of air is sufficiently lowered before expansion by making use of heat exchangers for heat transfer.
In a double column, lower column is designed for working pressure of 5 to 6 ata and top column for 1.5 ata. At the bottom of Lower column, liquid air containing approximately 30 to 40% of Oxygen by volume is collected and this rich liquid is taken to approximately middle of the top column, pure Oxygen Liquid is collected in the condenser. Liquid Oxygen of the upper column is used as a cooling agent to top column is used for further sub cooling the reflux or washing Nitrogen of lower column.

High Quality & Low Cost, the AO. Oxygen Plant, with an efficient expansion engine, lowers operating pressures to a remarkable 32-35 kg/cm2 , cuts power consumption and adds to safety. A Molecular sieve Battery drier unit for separation of moisture and carbon dioxide is another money-saving device in the AO plant. It removes acetylene and other hydro-carbons from the process air, thus eliminating the need for separate acetylene absorbers, and moreover it eliminates recurring caustic soda costs. Capable of simultaneously producing oxygen and High purity nitrogen, the AO plant has an internal compression liquid oxygen pump to fill dry gaseous oxygen in cylinders. Supervision of Installation and Commissioning of the plant is also undertaken by us.

Description of AO Nitrogen Gas Plant

The free atmospheric air is sucked in by a multi-stage air compressor through a filter and compressed to the working pressure. After each stage, intermediate coolers and water separators are provided. The compressed air then passes through the (evaporation) pre-cooler and then to the molecular sieve battery where the moisture and carbon dioxide are removed from the process air. It then passes through the exchanger No. 1 where it is cooled by the out-going waste nitrogen and product oxygen. A part of this cold air then flows through an expansion machine and the balance through the 2nd heat exchanger. The ratio of the two air streams is controlled by an expansion valve, RI. Both these streams of air then unite in the lower pressure column where it partially liquefies.The liquid air (rich air) then passes through the expansion valve R2 to the upper column which is at a lower pressure than the lower column. Similarly the liquid nitrogen (poor liquid) travels from the lower column to the upper column through an expansion valve R3 where the separation of oxygen and nitrogen occurs. Nitrogen being more volatile passes out as a gas from the top of the column and this waste nitrogen flows through both the heat exchangers cooling the in-coming air. Similarly product oxygen is also passed through the two heat exchangers to cool the in-coming air and then to the filling manifold via a liquid pump. If a small amount of air is vented out from the upper column, higher purity nitrogen can also be obtained from this plant. R4 Valve is provided in order to fasten cooling during start-up.

Plant Specifications

1. Production Capacity - The plant is very versatile and can be set for a cycle to produce any one of the following alternatives:-

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**NITROGEN PRODUCTION**
Name Of Plant	GasQuantity	GasPurity	Product Pr.
1. AO 80	275 Cu.M./Hr.	96%	0.1 Kg/cm2
2. AO 80	250 Cu.M./Hr.	99.5%	0.1 Kg/cm2
3. AO 100	450 Cu.M./Hr.	96%	0.1 Kg/cm2
4. AO 100	400 Cu.M./Hr.	99.5%	0.1 Kg/cm2
5. AO 200	700 Cu.M./Hr.	99.5%	0.1 Kg/cm2
6. AO 200	400 Cu.M./Hr.	99.9%	0.1 Kg/cm2

2. Other Capacities

**OTHER INFORMATIONS**
Details	AO 80	AO 100	AO 200
Air Pressure Starting	55 Kgs/cm2	55 Kgs/cm2	55 Kgs/cm2
Air Pressure Normally	35 Kgs/cm2	35 Kgs/cm2	35 Kgs/cm2
Starting Time (After Defrost)	7 Hours	5-6 Hours	5 Hours
Defrost Time	8 Hours	8 Hours	8 Hours
Defrosting Cycle at normal conditions	6 Months	9 Months	9 Months
Cylinder Filling Manifold Connections	2 x 10 Nos.	2 x 12 Nos.	2 x 24 Nos.
Cooling Water Requirement	15 Cu.m./hr	20 Cu.m./hr	50 Cu.m./hr
Inlet Cooling Water Temperature	25 C	25 C	25 C
Total Weight Approx.	26 Tons	29 Tons	50 Tons
Assembly Height	7.6 Metres	8 Metres	10.5 Metres
Maximum Roof Height	9 Meters	10 Meters	12 Meters
Area Required	15 Metres x 12 Metres	15 Metres x 12 Metres	35 Metres x 15 Metres
Air Input	444 N cu.m./hr.	550 N cu.m./hr.	1200 N cu.m./hr.
Power Supply Required	400 Volts & 230 Volts	400 Volts & 230 Volts	400 Volts & 230 Volts

GAS PLANTS ^{ALPHA OVERSEAS}

WE BELIEVE IN YOU, AND EXPECT THE SAME.

ALPHA OVERSEAS
REGISTERED OFFICE: B-52, Rama Road Industrial Area, Najafgarh Road, New Delhi - 110015
Tel: (91-11) 9212246801
E-mail: alphaoverseas8@yahoo.com