Which of the following is an effect of using hydrazine in boiler feedwater systems?

Using hydrazine in boiler feedwater systems primarily serves to decrease corrosion, which is why the correct answer focuses on this effect. Hydrazine acts as an oxygen scavenger; it reacts with dissolved oxygen in the boiler feedwater, effectively removing it. This is crucial because the presence of oxygen can lead to oxidative corrosion of steel components in the boiler system, ultimately reducing the lifespan and efficiency of the equipment.

By eliminating oxygen, hydrazine helps maintain the integrity of the system, which is vital for safe and efficient operation. The reduction in corrosion leads to less frequent maintenance and repairs, contributing to lower operational costs and improved reliability.

Other effects, such as increased heat transfer, reduced scaling, or enhanced chemical reactions, are not direct outcomes of hydrazine’s function in boiler systems. The primary role of hydrazine is focused on mitigating corrosion through its oxygen-scavenging properties.