Overall Solution for New Nitrogen Preservation Process in Thermal System of Power Plant — Application of PSA Nitrogen Generator

In the world of industrial gases, PSA Nitrogen Generator (Pressure Swing Adsorption) can be regarded as a star device. It separates nitrogen from the air through the principle of physical adsorption and provides a high-purity nitrogen source. Many industries rely on this technology, such as food packaging, chemical industry, and electronic industry. It can be said that "it can be used in all walks of life for various purposes".

Simply put, the PSA Nitrogen Generator works through two main processes. First, air is compressed and introduced into the adsorption tower. In this process, oxygen and water vapor are adsorbed by the adsorbent, while nitrogen is retained in the tower. Then, the tower saturated with adsorption will be depressurized to release the adsorbed gas, and finally high-purity nitrogen will be obtained.

Against the backdrop of the rapid development of China's machinery industry and electric power industry, large-capacity and high-parameter power generation equipment is widely used, and the surplus of electric power supply has promoted changes in the market pattern. The core equipment such as boilers and thermal pipelines in the thermal system of power plants mostly adopt high-strength alloy or carbon steel materials. When these materials are out of service, due to internal moisture evaporation and air entry, metal corrosion is prone to occur. This not only reduces the metal wall thickness, lowers the pressure-bearing strength, and shortens the service life of the equipment, but also causes excessive Fe ions in the feed water, requiring a large amount of sewage discharge. Therefore, reliable maintenance during the equipment outage period is crucial.

The traditional outage maintenance of thermal equipment mainly includes three methods: nitrogen filling preservation, desiccant preservation, and dry ventilation preservation. Among them, nitrogen filling preservation uses the inertness of nitrogen to isolate oxygen, and its preservation effect is better than the other two, so it is widely used in the outage maintenance of power generation equipment. However, the traditional nitrogen filling preservation with bottled nitrogen has obvious shortcomings. The core problem lies in relying on high-pressure cylinders to store nitrogen. Due to the limitations of single-cylinder capacity and pressure, in order to make the interior of equipment such as boilers reach the pressure and nitrogen concentration required for preservation, it is necessary to frequently replace cylinders or perform simultaneous filling operations with multiple cylinder groups. This not only makes the process cumbersome, but also leads to low nitrogen filling efficiency, making it difficult to quickly complete nitrogen replacement and pressure maintenance of the equipment, which is not conducive to improving the timeliness and economy of equipment outage maintenance.

To Solve the Deficiencies of Traditional Bottled Nitrogen Filling Preservation, a Stable and Efficient Nitrogen Supply System Can Be Constructed by Introducing a New Nitrogen Generation System. The Specific Implementation Path and Advantages Are as Follows:

From the perspective of system structure and operation analysis, once the nitrogen generation system is put into operation, it can realize the stable preparation and supply of nitrogen that meets the technical indicators for thermal equipment preservation. It provides a continuous and compliant nitrogen source for the nitrogen-filling preservation of all equipment in the thermal system, fundamentally breaking the dependence on high-pressure steel cylinders in the traditional preservation mode. Compared with the traditional bottled nitrogen-filling method, this system effectively avoids the frequent cylinder replacement operations caused by the limited capacity of a single cylinder. At the same time, it eliminates the complex process of coordinating and filling multiple cylinder groups, significantly simplifying the nitrogen-filling preservation operation link. In terms of operation efficiency and human cost optimization, the new nitrogen generation system can realize DCS (Distributed Control System) remote control. Staff do not need to frequently start and stop equipment on-site. They can complete key steps such as nitrogen preparation and nitrogen-filling pressure adjustment only through remote operation, greatly reducing human input.

From the perspective of nitrogen-filling efficiency, traditional bottled nitrogen requires a large number of steel cylinders to make the boiler reach the specified pressure, while this system only takes two hours to complete the nitrogen filling of the residual heat boiler system.

Moreover, it can stably maintain the nitrogen pressure in the equipment through the method of regular pressure charging (starting the nitrogen generator once every 6 hours to increase the pressure to above 50kPa), ensuring the continuity of the preservation effect and effectively solving the problems of cumbersome processes and low efficiency in the traditional method.

In addition, the new nitrogen generation system also has remarkable advantages in safety and versatility. The nitrogen produced by the system is atmospheric nitrogen, and its pressure is stably at a relatively low level, so it will not cause a significant drop in temperature due to pressure relief, thereby avoiding the frostbite risk that may be caused by traditional bottled nitrogen. At the same time, this system can not only meet the daily nitrogen-filling preservation needs of boilers but also be flexibly applied to gas replacement operations in scenarios such as natural gas pressure regulating stations and gas turbine system maintenance. The nitrogen replacement process is simple and fast, further improving the overall efficiency of equipment operation and maintenance, and providing a stable, efficient and safe solution for the outage preservation of thermal systems in power plants.

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In addition to PSA Nitrogen Generator, we also produce VPSA Oxygen Generators,PSA Oxygen Generators, storage tanks, heat exchangers and other products. If you are interested in psa nitrogen Systems or other products, please feel free to send an email to sales@gneeheatex.com. We will be very happy to serve you.