Power plants utilize nitrogen generators for various applications. In this discussion, we will explore some of the more common applications, along with the reasons why plant managers select nitrogen generators as their preferred N2 gas source.
Power Plant Applications
Nitrogen Purge for HRSG Wet and Dry Boiler Lay-Up – Corrosion poses a significant threat to the performance, safety, and longevity of boilers and boiler tubes in power plants. Nitrogen is an inert gas that protects against the corrosion of the inner walls of boiler tubes, condensers, and wetted parts. N2 gas works to displace oxygen, a key factor in the corrosion triangle, effectively inhibiting corrosion formation. When the boiler units are offline during a lay-up, nitrogen generators supply an N2 blanket in the boiler drums.
Case Study: A power plant in the Northeastern United States recently installed a South-Tek Systems nitrogen generator in two of its combined cycle facilities after realizing the potential for corrosion in its boilers. The capacities of the plants are 407 and 500 Megawatts, and they are used for both dry and wet lay-ups with one volume purge every 24 hours. One of the facilities functions as a peaking plant, meaning the nitrogen generator operates more frequently. When the units are offline, they provide an N2 blanket in the boiler drums. The nitrogen generator is also utilized to blanket the tube side of the feedwater heater during extended outages. The other plant operates as a base-loaded facility, so the nitrogen generator is used for boiler drum blanketing when the unit is offline for a prolonged period. With the nitrogen generator in place, operations are running smoothly, and concerns about corrosion have been alleviated.
Ammonia Purge – Some power plants use nitrogen generators to blanket ammonia storage tanks. Nitrogen is connected to the vapor space of the ammonia storage tank to provide a nitrogen blanket for the system. The purpose of implementing a nitrogen blanketing system on aqueous ammonia tanks is to prevent the ingress of air into the tank vapor space during low ambient temperature conditions when the vapor pressure of ammonia falls below atmospheric pressure.
Natural Gas Purge – More power plants are utilizing natural gas. When a leak occurs, the site evacuates natural gas using nitrogen within the piping system before repairs are made to reduce the risk of explosions. During this procedure, the nitrogen fill valve is opened to pressurize the pipe. A pressure gauge is used to monitor pressure loss and check for leaks. Precautions are taken when releasing the purged gas into the atmosphere, such as ensuring proper ventilation. Being inert, nitrogen mitigates the risk of explosions and extends the life of power plant equipment.
Why Use a Nitrogen Generator?
Nitrogen generator equipment is increasingly utilized in power plant applications due to its capability to produce an unlimited supply of nitrogen on demand at the facility, thereby eliminating missed deliveries and reducing escalating costs associated with contracts. This equipment also serves as a convenient, safe, and more reliable alternative to the delivery and handling of bulky compressed gas cylinders or tanks.
Why South-Tek Systems?
South-Tek Systems is the world leader in designing and manufacturing nitrogen generating equipment. We have extensive experience working with the power generation industry. Our nitrogen systems are safe, reliable, and cost effective. Plus, we offer engineered solutions that help us monitor and track installed systems for performance, optimization, and safety.