Oxygen Generator Cryogenic Air Separation Plant Cryogenic Oxygen Plant

Cryogenic air separation plant, Oxygen plant, Oxygen generator

Process Features

-      Process concept

• The process design has been optimized, which means the evaluation of power consumption versus investment cost based on the basis of design condition.

• Entire low pressure adsorption type purification by molecule sieve, air booster compression, LP expansion turbine with booster breaker, O2/N2 internal compress pumps, Internal oxygen compression cycle, which has the benefit of replacing external oxygen compression facilities and as such increases plant safety and availability.

• Air recycle by air booster provides the heating fluid for the internally compressed products.

• After the main air compressor the air is cooled in a direct contact air cooler supplied with chilled water, which is cooled in an evaporation cooler.

• To allocate LIN injection pipeline for quick startup ASU plants.

-      Machinary and Equipment Concept

• A state of the rectifying column system is used containing a double column system and auxiliary crude argon column system with structured packing in the pressure column, in the low pressure column and in the crude argon column .

• The cold box assembly is of modular design with separate cold box modules for heat exchangers and pressure column / low pressure column.

-      Qualityand Safety Concept

• According to ISO9001 and company standards requirement, to adopt quality management system for engineering design and equipment manufacturing, this will bring excellent quality level.

• Multi-time design check and review, fulfilled by experienced experts and leaders from relative engineering department.

• CNASEC has rich operation experience on internal compression air separation equipments, and accumulate large number s of actual running experience, for internal compression process air separation equipments designed by China ASU company, a lot of safety protectivemeasurements and controlling loop is considered, these measurements k eep the safety of plants from startup—normal running—shutdown and malfunction shutdown etc.

• Personnel protective measurements shall be taken in the case that operation people is possible to suffer from extreme temperature, rotating parts or other process influence.

• Once encountering unforeseen problems or wrong operation, high-grade interlock function can protect ASU, once power-off, ASU will be in safety condition.

• To guarantee plant's long service period , only using reliable equipments which are inspected.

• Inside Coldbox valve racks ,piping supports setting are all optimized after stress analysis calculation to pipings, to ensure the dependability under cryogenic woring condition.

• No combustible material in side Coldbox or LOX/GOX system.

• Safety for moleculer sieve adsorber system:

• Highly effective, high mechanical strength new type moleculer

• Each cycle of moleculer sieve regeneration is complete, no more special regeneration, No CO2 can puncture;

• High strength: After moisture adsorption, will not reduce its intensity to form softly;

• Vertical radial two layers adsorber is used;

• The two layers bed structure is simple, molecular sieve will not be fluidization as the structure, preventthe molecular sieve be blew over turns;

• Air flow be distributed equally,the windwardface is big, the resistance is small, to save power consumption, and to lengthen service life of molecular sieve;

• Regeneration gas pass from inside to outsite, no thermal load, less heat loss;

• Outside piping design is easy, Simplify engineering design and piping material;

• The area is small, advantageous for the air seperation plant arrangement

• 3 lever valve is used for switch valve,safeguard service life of molecular sieve adsorber system.

• The main condenser / reboilers of bath type with full flooded design and inherent safe level.

• Material within the column is mainly aluminum and welded. Flange connections are avoided as far as possible.

• Safety measures for plate fin heater and units

• To proceed with designing, fabricating and inspection as per strictstandards and complete process controlling system;

• To do intensity experiment before ex-work;

• To do He-leakage test(design pressure) before ex-work;

• Much outstanding achievement of plate-fin heat exchanger;

• Design for Eliminating the risk caused by enrichment of N2Oand hydrocabon in cryogenic equipment :

• New type moleculer sieve adsorbent or equivalent is highly effective and high mechanical strength, higher adsorption rate of N2O than other moleculer sieve;

• Avoiding dead angle of piping and equipment during design calculation, eliminating the possibility of hydrocarbon enrichment after LOX boil away;

• LOX internal compress, oxygen production be drew as liquid status, minimize the possibility of hydrocarbon and N2O enrichment in condenser by eject hydrocarbon and N2O continuously.

• Full bath type condenser/evaporator can prevent enrichment of harmful substance efficiently;

• Live and on-line analyse and surveillance of N2O rate in CB, alarm once exceeds the set point;

• Live and on-line analyse and surveillance of hydrocarbon rate for LOX in main condenser, alarm once exceeds the set point;

• Back-up supply of Oxygen products in case of plant failure.

• Back-up supply of Nitrogen products in case of plant failure.

ASU Technical Performace Parameter

• Capablility of ASU design & fabrication

We can design, manufacture and complete air separation plant according to end users' climatic, geologic and water quality conditions, as well as their different purity and quantity requirements for oxygen, nitrogen and argon. We have the capability to design and fabricate air separation plant with capacity from 10,000Nm3/h to 100,000Nm3/h.