What is the function of evaporators in the chlorine feed system?

The function of evaporators in the chlorine feed system is to convert liquid chlorine into gaseous chlorine, which is needed for the disinfection process in water treatment systems. Chlorinators require chlorine to be in gas form to efficiently mix with the water being treated, as this allows for proper distribution and contact time for effective disinfection.

When chlorine is stored, it is usually in a liquid state under pressure. To utilize it effectively, this liquid chlorine must be vaporized into gaseous chlorine. Evaporators achieve this by applying heat or reducing pressure, depending on the system design. This transformation is crucial because chlorine gas is what reacts with water to form hypochlorous acid, the active disinfectant.

Other options do not accurately describe the role of evaporators in this context. For instance, converting solid chlorine to liquid is not related to the function of regenerating the gaseous form required for chlorination. Similarly, while removing impurities may be necessary within the chemical handling system, it is not the primary function of the evaporator itself, and increasing chlorine retention time does not pertain directly to the evaporation process. Hence, the essence of evaporators rests in their role of converting liquid chlorine to gas for practical application in water treatment.