Proposed Research on Saline-Water Distillation for Living by Utilizing Waste Heat from Industrial Steam Boilers

Demands on water as well as energy are raising rapidly with population increase; while fresh water in Vietnam is being a shortage, and industrial processes have exhausted a vast quantity of heat into environment. In this paper, a saline-water distillation system utilizing industrial boiler waste heat with low temperature water loop is proposed. This system assures the cleanliness of heat exchange surfaces. Furthermore, a condenser having two independent cooling water flows is used to guarantee the completely condensation of vapor in it to produce the fresh water and to heat the water for daily living. Calculation was relied on mass and energy balance equations, saline balance equations in the evaporator, and related equations on the physical properties of saline water, saturated vapor, and water. Case-study results for 10 ton/hour industrial steam boiler show that 208 kg/h of freshwater is collected and 2546 kg/h of running water can be heated respectively. With the chosen parameters, all of the heat exchangers equipped in the system are capable made in Vietnam.