In the field of normal-temperature air separation, pressure swing adsorption equipment has become the mainstream equipment for on-site industrial gas preparation due to its modular design, low energy consumption and no need for low-temperature liquefaction. Most manufacturing enterprises configure air separation equipment according to initial production demands to produce inert protective gas for production scenarios such as material anti-oxidation and explosion isolation. With the upgrading of production lines, process iteration and product category expansion, the gas demand of some enterprises will change from traditional nitrogen supply to oxygen supply, which is widely used in wastewater treatment, combustion supporting, medical assistance, aquaculture oxygenation and other scenarios. Compared with purchasing brand-new oxygen generating equipment directly, targeted transformation based on the original air separation equipment architecture is the optimal solution that balances cost, efficiency and resource utilization, and it is also the mainstream method for equipment upgrading of small and medium-sized factories at present.

　　To realize the accurate function switching of air separation equipment, it is necessary to clarify the core technical differences between nitrogen generating equipment and oxygen generating equipment first. Both types of equipment rely on pressure swing adsorption technology, take compressed air as raw material, and realize air component separation through selective adsorption of molecular sieves, but their core adsorption media and separation principles are completely different. Conventional nitrogen generators adopt carbon molecular sieves as the core adsorption materials. Taking advantage of the faster diffusion rate of oxygen molecules, they adsorb oxygen in the air under pressure and retain nitrogen for enrichment and output. In contrast, oxygen generators are equipped with zeolite molecular sieves, which preferentially adsorb nitrogen impurities in the air and allow oxygen to penetrate and enrich smoothly to prepare high-purity oxygen. The differentiated selection of core media is the fundamental reason for the different functions of the two types of equipment and the core entry point for equipment transformation.

　　In terms of equipment structure, nitrogen generating equipment and oxygen generating equipment have highly versatile basic frameworks, including air pretreatment systems, compression and filtration components, dual adsorption tower structures, pressure stabilizing gas storage systems and intelligent electric control modules. Their basic gas supply links, pressure adaptation ranges and pipeline layouts are basically consistent, which provides feasibility for equipment transformation. Enterprises do not need to replace large-scale basic components such as the whole machine frame, air compressor and refrigerated dryer. They only need to replace core adsorption consumables, adjust pipeline pressure stabilizing parameters and optimize electric control procedures to complete equipment function switching. This greatly reduces the procurement cost and disassembly and assembly period of equipment upgrading, maximizes the reuse of original equipment resources and avoids idle equipment waste.

　　The complete equipment transformation process is standardized and lightweight, without large-scale civil construction and structural modifications. The first step is core medium replacement. Remove the original carbon molecular sieves, thoroughly clean residual impurities inside the adsorption tower, fill high-quality zeolite molecular sieves suitable for working conditions, and inspect the tower sealing structure to eliminate air leakage and gas channeling problems and ensure separation accuracy. The second step is parameter system debugging. The pressure, adsorption duration and pressure relief cycle of the original nitrogen generating equipment are adapted to nitrogen separation requirements. After transformation, the equipment operating parameters need to be recalibrated, and the time ratio of pressure adsorption and pressure relief desorption needs to be optimized to match the kinetic characteristics of oxygen separation, avoiding problems such as insufficient purity and unstable gas production. The third step is pipeline and accessory optimization. Replace seals and valves adapted to oxygen-enriched environments to prevent accelerated aging and oxidation failure of ordinary accessories under high-oxygen working conditions and improve equipment operation safety. The final step is whole machine commissioning and purity testing to verify the gas production effect under different pressure and flow rates step by step, ensuring that oxygen purity, gas production flow and stability meet standards.

　　The air separation equipment after professional transformation can fully meet the operating standards of special oxygen generating equipment, while retaining the original advantages of low energy consumption, simple operation and maintenance and flexible deployment. In terms of service performance, the oxygen purity of the transformed equipment can be stably controlled within the standard range, meeting the needs of most civil and industrial scenarios such as industrial combustion supporting, sewage aeration, aquaculture and laboratory gas supply. Compared with purchasing new equipment, the transformation solution can save more than half of the upgrading cost and shorten the construction period by more than two-thirds. In addition, the original equipment operation and maintenance system does not need to be rebuilt, and operators can get started by following the original inspection and maintenance process, greatly reducing the time and labor costs of enterprise equipment upgrading.

　　This type of equipment transformation solution is suitable for industrial upgrading demands in multiple industries with a wide range of application scenarios. In the industrial manufacturing field, after the traditional heat treatment and metal processing production lines relying on nitrogen protection are upgraded to oxygen-enriched combustion supporting processes, the transformed equipment can provide stable oxygen gas sources, improve fuel combustion efficiency and reduce energy consumption and exhaust emissions. In the environmental protection water treatment industry, idle original air separation equipment can be transformed to produce sufficient oxygen for biochemical tank aeration and oxygenation, activate microbial activity and improve sewage treatment efficiency, meeting the energy-saving transformation needs of small and medium-sized sewage stations. In the aquaculture industry, the transformed equipment can continuously output clean oxygen-enriched gas to improve the dissolved oxygen environment of water bodies, avoid the death of fish and shrimp caused by oxygen deficiency and increase the breeding survival rate. In addition, scenarios such as small-scale medical assistance, laboratory scientific research, glass smelting and kiln combustion supporting can realize low-cost gas source upgrading through equipment transformation.

　　In the process of equipment transformation and later operation and maintenance, core details need to be controlled to ensure long-term and stable operation. Firstly, molecular sieve materials of corresponding specifications should be selected according to actual gas purity and flow demands to avoid low gas production efficiency caused by improper consumable selection. Secondly, air pretreatment should be strengthened after transformation to strictly filter oil, moisture and impurities in compressed air, prevent pollution and failure of zeolite molecular sieves, and extend the service life of core consumables. At the same time, electric control procedures and pressure parameters need to be calibrated regularly, and operation logic should be fine-tuned according to seasonal temperature differences and gas load to ensure stable gas production throughout the year. Basic daily maintenance work such as filter element replacement, pipeline leakage detection and tower pressure inspection can effectively reduce equipment failure rate and extend the service life of the whole machine.

　　With the development of energy-saving and intensive industrial production, functional upgrading and resource reuse of old equipment have become important ways for the manufacturing industry to reduce costs and increase efficiency. The functional switching and transformation technology of air separation equipment solves the equipment iteration problem caused by enterprise gas process upgrading with the advantages of high adaptability, low cost and short cycle, avoiding resource waste caused by traditional equipment elimination and replacement. In the future, with the continuous upgrading of molecular sieve materials and intelligent control technology, the gas production accuracy, energy consumption control and operation stability of transformed equipment will be further improved. It will provide an efficient and economical gas source solution for process upgrading and production capacity optimization in more industries, and help the high-efficiency and green development of industrial production.