Oversized Air Separation Unit for Coal Chemical
Operating Principle And Working Mode
Air compression and purification: The air is compressed by a large multi axis centrifugal air compressor and enters a double bed molecular sieve purification system to deeply remove moisture, CO₂, and all hydrocarbons, with safety standards far exceeding those of ordinary air separation.
Dual distillation and refrigeration
The purified air is divided into two main airflows and a high-pressure airflow
① Main air flow: After being cooled by the main heat exchanger, it enters the two-stage distillation tower for conventional separation of oxygen, nitrogen, and argon, and obtains low-pressure liquid oxygen at the bottom of the tower.
② High pressure air flow: A portion of the air is pressurized to 8.0-10.0 MPa by an air booster, serving as a cold source and subsequent power source.
Core link - Internal compression process of high-pressure oxygen
Liquid oxygen pump pressurization: The liquid oxygen extracted from the main cold is pressurized by a large flow multi-stage liquid oxygen pump to the required pressure of the gasifier (usually 1-2MPa higher than the gasifier pressure).
High pressure heat transfer vaporization: High pressure liquid oxygen and high-pressure air exchange heat in a high-pressure plate fin heat exchanger in reverse flow. Liquid oxygen absorbs heat and vaporizes into high-pressure ambient temperature oxygen; High pressure air is liquefied and then throttled before being sent to the distillation tower as a supplementary raw material. This process achieves "spark free" production of high-pressure oxygen.
Full distillation extraction of argon gas
An integrated full distillation argon production system extracts argon fractions from the main tower, removes oxygen and nitrogen impurities in the crude argon tower and refined argon tower, and produces ultra-high purity liquid argon as a high value-added product.
Intelligent load regulation
Its control system is deeply coupled with the operating status of the gasifier, and can adjust the oxygen production in real time according to the synthesis gas production, achieving integrated intelligent scheduling of "gasification air separation".
Parameter
Oxygen
|
Output |
Purity |
Pressure |
Operating Load Range |
|
60,000 – 120,000 Nm³/h |
≥ 99.6% |
6.0 – 9.0 MPa(G) |
60% – 105% |
|
Exhaust pressure of main air compressor |
Outlet pressure of air booster |
Outlet pressure of liquid oxygen pump |
|
0.6 – 0.8 MPa(A) |
0.5-1.5 MPa higher than the target oxygen pressure |
1.0-2.0 MPa higher than the target oxygen pressure |
|
Unit oxygen power consumption |
Argon extraction rate |
Annual operating time |
|
0.37 – 0.42 kWh/Nm³ O₂ |
≥ 90% |
≥ 8,000 hours |
(For Reference Only)
The parameter specifications of large-scale air separation in coal chemical industry define its role in the modern coal chemical industry chain:
Scale parameter
Supports single line economies of scale for million ton coal chemical projects.
Pressure parameters
Seamless integration with the core technology of coal gasification has been achieved.
Economic parameters
Its low power consumption and high argon extraction rate directly determine the operating costs and profit elasticity of the entire coal chemical project.
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