Finding the way to control precision
Chemical and petrochemical producers face ever-increasing regulatory, environmental and performance demands. Now, more than ever, deep application knowledge and application specific technologies are required in order to select control valves that are just right for the application and helps keeping the engineering and operational costs at a reasonable level.
Text: Sari Aronen
Photos: Vilhelm Sjöström & Shutterstock
Furnace fuel gas control is a good example where accurate, reliable control valves play a significant role in reducing operating costs. Proper combustion maximizes heat transfer, which minimizes fuel gas consumption and related costs. Variations in fuel gas composition and different operating conditions at start up, normal operation and shut down means that such valves must control various loads, which requires a wide rangeability from the valve. This is typically solved by using a split range configuration with globe valves. Another method is to use rotary control valves with a wide rangeability, such as V-port segment valves. In this way, the wide rangeability allows accurate control with both small flows and large valve openings with a single valve solution.
Sari Aronen explains that “there’s no right or wrong way to design your fuel gas control method from the options presented. The most important is to decide what works best for the plant in question and weigh up the pros and cons of engineering, piping costs, inventory management and daily operations. Partnering with a valve supplier that can provide a variety of reliable solutions to meet the specifications and, more importantly, can help to find the right solution for your plant and your case is the key to success.”
Previously published in Results flow control 1/2015 and Valve World magazine, June 2015 issue, as sidebar of the article 'Welcome to uptime with Metso's control valves'.