500L Multi-effect Distilled Water Machine Equipment

# 500L Multi-effect Distilled Water Machine Equipment Process

Multi-effect distilled water machines are widely used in industries such as pharmaceuticals, food, and electronics to produce high-purity distilled water. Below is the typical equipment process for a 500L multi-effect distilled water machine:  *

**I. Feed Water Pretreatment**

First, the raw water enters the pretreatment system. The raw water may be tap water or water that has undergone preliminary treatment but may still contain impurities such as suspended solids, colloids, microorganisms, organic matter, and some dissolved solids. Pretreatment typically includes steps such as sand filtration, activated carbon adsorption, and precision filtration. Sand filtration removes larger suspended particles; activated carbon adsorption effectively eliminates organic matter, residual chlorine, etc., improving the water's taste and odor; precision filtration further removes tiny particulate impurities, ensuring that the water entering the multi-effect distillation system has low turbidity and impurity content, providing good feed water conditions for subsequent efficient distillation.

 **II. Multi-effect Distillation Principle and Process**

After pretreatment, the water enters the first-effect evaporator of the multi-effect distilled water machine. Multi-effect distillation is based on the principle of multiple evaporation and condensation, utilizing the latent heat of steam to gradually evaporate and condense water in a series of evaporators. In the first-effect evaporator, external fresh steam (typically provided by a steam boiler) enters the heating chamber to heat the feed water, causing it to boil and evaporate at a temperature lower than the steam temperature. The generated secondary steam enters the heating chamber of the second-effect evaporator, serving as the heat source for the second effect, while the water in the first-effect evaporator continuously evaporates and concentrates, forming a concentrated liquid that is discharged. In the second-effect evaporator, due to the lower operating pressure compared to the first effect, the water evaporates again at a lower temperature, and the generated steam enters the third-effect evaporator, and so on. Each evaporator repeats the evaporation and condensation process. As the number of effects increases, the pressure and temperature of the steam gradually decrease, but water evaporation can still be achieved.

 **III. Steam-Water Separation and Heat Recovery**

In each evaporator, effective steam-water separation is required for the generated steam and unevaporated water. Through specially designed steam-water separators, utilizing principles such as centrifugal force and gravity, steam and water are separated. The steam enters the heating chamber or condenser of the next effect, while the water is recirculated to the same evaporator or discharged from the system. Simultaneously, throughout the multi-effect distillation process, heat recovery is fully considered. For example, the secondary steam generated in the last-effect evaporator enters the condenser, where it is cooled by cooling water to form distilled water. The cooling water, after absorbing the heat from the steam, increases in temperature. This heat can be transferred to the feed water through a heat exchanger for preheating, improving energy utilization efficiency and reducing steam consumption. 

 **IV. Distilled Water Collection and Storage**

The distilled water obtained after multi-effect distillation and condensation is collected from the condenser outlet into a distilled water storage tank. During the collection process, it passes through fine filtration devices such as microporous filters to further remove any residual tiny particles, ensuring the purity and quality of the distilled water. The storage tank is typically made of stainless steel, offering good sealing and insulation properties to prevent contamination and excessive temperature changes. During storage, online water quality monitoring equipment is also installed to monitor key indicators such as resistivity and microbial content in real-time, ensuring that the distilled water meets the high-quality standards required by relevant industries and is readily available for production use.

In summary, the 500L multi-effect distilled water machine, through comprehensive processes including feed water pretreatment, multi-effect distillation, steam-water separation and heat recovery, and distilled water collection and storage, can stably and efficiently produce large quantities of high-purity distilled water. This meets the stringent demands of various industries for high-quality distilled water, providing a solid guarantee for product quality and production processes.