what is the effect of increasing the Electrical conductivity in the water (in BFW or DMW)?
Increasing the electrical conductivity in water can have several effects, particularly in industrial applications like boiler feedwater (BFW) or demineralized water (DMW) systems. The effects can be both positive and negative, depending on the specific circumstances.
To understand why increasing electrical conductivity can have various effects, let's first understand what electrical conductivity is. Electrical conductivity is a measure of a substance's ability to conduct an electric current. In the case of water, it indicates the presence of dissolved ions, such as salts and minerals. These ions can be both beneficial and problematic, depending on the concentration and the purpose of the water.
1. Positive Effects:
a) Enhanced Dissolved Solids Removal: In demineralized water (DMW) systems, higher electrical conductivity can actually be beneficial. DMW systems are designed to remove all dissolved solids and impurities from water. By increasing electrical conductivity, it becomes easier to detect the presence of remaining dissolved solids, ensuring the effectiveness of the demineralization process.
b) Water Treatment Efficiency: In some cases, increasing the conductivity of boiler feedwater (BFW) can improve water treatment efficiency. The presence of certain dissolved ions, such as calcium and magnesium, can assist in the formation of a protective scale on the inner surfaces of the boiler, reducing the risk of corrosion.
2. Negative Effects:
a) Scaling and Fouling: Higher electrical conductivity can lead to scaling and fouling issues in industrial systems. When water with high conductivity is heated, the dissolved ions can precipitate and form scale deposits on heat exchange surfaces, reducing heat transfer efficiency. Scaling can also occur on the insides of pipes, valves, and other equipment, leading to blockages and reduced flow rates.
b) Corrosion: Increased conductivity can promote corrosion in metal components of industrial systems. Higher levels of dissolved ions in water can accelerate the electrochemical reactions that cause corrosion, leading to equipment degradation, leaks, and costly repairs.
To determine the specific effects of increasing electrical conductivity in BFW or DMW, it is important to consider the specific requirements and limitations of the system, as well as conducting water testing and monitoring. Regular water analysis can help ensure that appropriate measures are taken to achieve the desired water quality and mitigate any potential negative effects.