-
E-mail
njtsjx@163.com
-
Phone
13770985289
-
Address
190 Bianzhong East Road, Chengqiao Town, Nanjing City
Nanjing Tianshui Machinery Equipment Co., Ltd
What is the structural principle of the double tube plate multi effect distilled water machine?
Date: 2025-11-03Read: 7
The structural principle of the double tube plate multi effect distilled water machine combines multi effect distillation technology with double tube plate anti pollution design. Its core lies in the preparation of high-purity water through cascade heat energy utilization and physical isolation. The following explains from two aspects: structural composition and working principle:
1、 Structural composition
1. Double tube plate heat exchanger
The core components of the equipment adopt a dual tube plate design, which means that the inner and outer layers of tube plates form independent fluid channels. The inner tube plate comes into contact with raw water or distilled water, while the outer tube plate is isolated from the heating medium (such as steam). A leak detection port is set between the two tube plates. Once the inner tube plate ruptures, the leaked liquid will be discharged through the gap to avoid cross contamination.
2. Multi effect evaporation system
Composed of multiple evaporators connected in series, typically with 4-8 efficiency. Each evaporator is equipped with a heating chamber and a separation device. The first effect uses industrial steam as the heat source, and the subsequent effects utilize the secondary steam generated by the previous effect as the heat source, achieving a cascade utilization of thermal energy.
3. Auxiliary system
Liquid level control: The first effect evaporator is equipped with a liquid level sensor, which automatically discharges accumulated water to prevent raw water from entering the pure steam pipeline.
Conductivity monitoring: An online conductivity meter is installed at the outlet of distilled water, which controls the discharge of unqualified water through two three-way valves and adopts a delayed opening design to avoid contaminating qualified water.
Condensation and collection: The final secondary steam is cooled by a condenser to distilled water, which is then collected in a temporary storage tank and further purified through a pipeline filter.
2、 Working principle
1. Multi effect evaporation process
After preheating, the raw water enters the first effect evaporator and is heated and evaporated in the tube side to produce secondary steam. This steam serves as the second effect heat source and condenses into distilled water; Repeat this process sequentially for each subsequent effect, and merge the final effect with distilled water after secondary steam condensation.
2. Pollution prevention mechanism
The dual tube plate structure ensures complete isolation between the heating medium and the raw water/distilled water. Even if the tube plate leaks, the leaked liquid will be discharged through the gap between the two tube plates to avoid contaminating the finished water. In addition, liquid level control and conductivity monitoring further ensure the stability of water quality.
3. Energy efficiency and water quality
The multi effect design improves the utilization efficiency of heat energy, and the effluent meets the standards for injection water in the pharmacopoeia, with a high removal rate of endotoxins.
