Air Separation Plant

Better Deal Machinery is a major manufacturer of air separation plant in India. The company boasts of world-class expertise in engineering, designing and technological processes. All of our plants are manufactured using the latest cryogenic distillation technology which is known for its efficiency and reliability. It is able to generate oxygen with purity up to 99.7% and nitrogen with purity up to 99.99%. Industries prefer cryogenic based plants because of their capacity to produce unlimited oxygen or nitrogen with high purity. Hospitals also prefer using them for getting high purity medical oxygen.

Designing of the plant machinery is of utmost importance. After all, it determines the efficiency and reliability of its operations. We have world-class expertise in the field which is evident from our track record of hundreds of air separation plants working seamlessly decades after having been installed. Manufacturing is also completed in compliance with globally accepted standards. Materials used in the fabrication are done with high quality materials. Our machinery is CE certified which is globally recognized. Our focus is to deliver products that deliver performance which our customers expect from our world-class expertise. And, we have always delivered products satisfying their requirements.

BDM is one of the few reputed companies that use internationally acclaimed components. We use air compressor from Atlas Copco, which is No. 1 brand for the compressors. It does not need any emphasizing that it forms the most important part of the air separation equipment. We use a purification unit from ZEOCHEM a renowned Swiss company. Air separation column is fabricated with cryogenic grade steel for greater efficiency and performance. Clean and precision argon welding is used in the fabrication.

Basic Principle :

The air separation plant is a plant recovering oxygen and nitrogen from air simultaneously. It uses advance low pressure technology process of linde using Rotary screw compressor (or low oil free piston compressor) and turbo expanders. The feed air entering the Molecular Sieve purification system employed to remove the moisture and CO2 from the process air. The air is liquefied by cryogenic cooling using latest plate and fin high efficiency heat exchangers and turbo expanders. The liquid air separates into oxygen nitrogen and inert gases in the air separation column.

Salient Features :

Technical Specifications

Capacity range : 20m3/hr to 1000m3/hr

Purity : 99.7% for oxygen & 99.99% for nitrogen

Type of welding : TIG argon welding

Electrical fitting : Confirm to NEMA standards

Snapshot of BDM Air Separation Plant

We are supplying low pressure plants manufactured by us with the following main components:

• Low pressure Rotary compressor or Oil free piston air compressors.
• Low pressure driers.
• Low pressure refrigerant drier.
• Turbo expander.
• Low pressure air separation unit.

Process Description

Air Compressor-Low Pressure : Air is compressed at a low pressure of 5-7 Bar. Air can be compressed at such low pressure by trouble free rotary compressor (screw / centrifugal type advanced technology is employed in lieu of old bulky piston compressor.

Pre-Cooling System : The second stage of the process uses a low pressure refrigerant for precooling the processed air to temperature around 12 deg C before it enters the purifier.

Purification of Air by Purifier : The air enters a purifier consisting of twin molecular sieve driers, working alternatively. The molecular sieve removes the carbon dioxide & moisture from the process air before the air enters air separation unit.

Cryogenic Cooling of Air by Turbo Expander : The air has to be cooled to sub – zero temperature for liquefaction & the cryogenic refrigeration & the cooling is provided by highly efficient turbo expander which cools the air to temperature almost below -165deg C to -170 deg C.

Separation of Liquid Air into Oxygen Nitrogen by Air Separation Column : Oil free, moisture free & carbon dioxide free air enters into low pressure plate fin type heat exchanger where the air is cooled below sub-zero temp by air expansion process in the turbo expander. Due to the excellent thermal efficiency we can achieve a temperature difference delta T as low as 2 deg C at the warm end of these exchangers. Air gets liquefied when it enters the air separation column & gets separated into oxygen nitrogen by process of rectification. Oxygen is available at the outlet of the ASU at a purity of 99.6%. Nitrogen is also available at the outlet as a second product at purity of 99.99% up to 3ppm simultaneously without loss of oxygen product.

Compression of Oxygen Filling in the Cylinder : The final product in the form of compressed oxygen/nitrogen goes to the high pressure oxygen cylinder at 150 Bar or higher as required for pipe line supply or captive consumption.