TDS stands for Total Dissolved Solids. In the context of a boiler, TDS refers to the concentration of dissolved solid particles in the boiler water.
Watch our CEO Alan Keogh explain why optimising TDS Control will help save you energy and carbon, but also the longevity of your boiler.
These solids can include minerals, salts, and other impurities that are naturally present in the feed water or accumulate during the operation of the boiler.
TDS control is important in boiler operations because excessive levels of dissolved solids can have negative effects on boiler efficiency and performance. When TDS levels are too high, it can result in several problems, such as:
Scaling:
High TDS levels can lead to the formation of scale deposits on the internal surfaces of the boiler, including heat transfer surfaces such as tubes and pipes. Scale acts as an insulator and reduces the heat transfer efficiency, which can result in higher fuel consumption and reduced boiler efficiency. In severe cases, scale deposits can lead to overheating, tube failures, and other operational issues.Corrosion:
High TDS levels can also increase the likelihood of corrosion in the boiler system. Dissolved solids can promote corrosion of metal surfaces, including boiler tubes and other components, leading to premature failure, leaks, and reduced boiler lifespan.Foaming and carryover:
Elevated TDS levels can cause foaming and carryover in the boiler water. Foaming can lead to poor steam quality, reduced heat transfer efficiency, and increased maintenance requirements. Carryover refers to the entrainment of water droplets with steam, which can cause damage to downstream equipment and reduce overall system efficiency.
To make your boiler more efficient, proper TDS control is essential. Here are some common methods for TDS control in boilers:
Blowdown:
Regular blowdown, which is the intentional removal of a portion of boiler water to lower TDS levels, is one of the most common methods for TDS control. Blowdown can be either continuous or intermittent, and the frequency and duration should be optimised to maintain the desired TDS levels without excessive water and heat loss.Water treatment:
Proper water treatment, including processes such as water softening, reverse osmosis, and deionisation, can reduce the levels of dissolved solids in the feed water, which in turn can help control TDS levels in the boiler water.Monitoring and control:
Regular monitoring of TDS levels in the boiler water using conductivity meters or other analytical methods can help detect deviations from the desired TDS levels and allow for timely adjustments to maintain optimal TDS control. Automated control systems can also be used to maintain TDS levels within the desired range.
By effectively controlling TDS levels in your boiler, you can help improve its efficiency, reduce the risk of operational issues such as scaling and corrosion, and extend the lifespan of your boiler system.