Molecular Sieve Purification System
Introduction
The molecular sieve purification system plays an indispensable "guardian" role in the air separation process, and its role is crucial:
● Protecting the safety of low-temperature equipment: Thoroughly removing carbon dioxide and hydrocarbons to prevent them from freezing and accumulating in subsequent heat exchangers and distillation towers below -170 ℃, thus eliminating the biggest safety hazard of explosion in the main condenser evaporator.
● Ensuring stable operation of the device: Deeply removing moisture, preventing water from freezing and blocking low-temperature pipelines and valves, ensuring stable heat transfer efficiency, is a prerequisite for achieving long-term and continuous operation (≥ 3 years) of the air separation unit.
● Improving product purity: Providing clean raw air for the distillation tower is the basic condition for obtaining high-purity oxygen, nitrogen, and argon products.
Main Application Industries
Molecular sieve purification systems are a standard and essential component of all large and extra-large air separation units employing cryogenic processes. Therefore, their application industries are entirely consistent with the downstream industries of these air separation units:
Iron and Steel Metallurgy
Providing clean air for large-scale air separation units supporting steel plants.
Modern Coal Chemical and Petrochemical Industries
Providing pretreatment for extra-large air separation units in coal gasification, synthetic ammonia, and ethylene production.
Non-ferrous Metal Smelting
Used in air separation units for oxygen-enriched smelting of copper, lead, zinc, etc.
Others
Any field requiring large-scale production of industrial gases (oxygen, nitrogen, argon).
Parameter
|
Processing gas volume |
work pressure |
Operating temperature |
Switching cycle |
Export impurity content |
Regeneration gas consumption |
|
Tens of thousands to hundreds of thousands of Nm³/h |
0.5 – 0.8 MPa(G) |
8 – 15 ℃ |
4, 6 or 8 hours |
H₂O: ≤ 1 ppmv CO₂: ≤ 1 ppmv |
Approximately 12-20% of processing air volume |
(For Reference Only)
Key Advantages
This system offers several core advantages for ensuring the safe and efficient operation of air separation units:
Deep Purification
It can simultaneously and efficiently remove multiple harmful impurities, especially carbon dioxide and hydrocarbons, which pose the greatest threat to subsequent cryogenic equipment, effectively preventing pipeline and equipment blockage or explosion.
01
Stable and Reliable Operation
Employing dual (or multiple) adsorption towers that alternately operate and regenerate, with automatic switching controlled by a program, it can achieve continuous operation for several years without interruption, matching the requirements of long-term air separation operation.
02
High Adaptability
It has a certain range of tolerance to inlet gas conditions (such as pressure and temperature) and can maintain stable outlet purity throughout the entire adsorption cycle.
03
High Degree of Automation
The entire adsorption, heating and regeneration, cooling, and switching process is fully automatically controlled by PLC, greatly reducing the need for manual operation.
04
Relatively Convenient Maintenance
The main maintenance work is periodic (e.g., every 3-5 years) inspection or replacement of the adsorbent; daily maintenance is minimal.
05
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