High-power concentration distillation desalting system and method based on induced crystallization method

Abstract

The invention discloses a high-power concentration distillation desalting system and a high-power concentration distillation desalting method based on an induced crystallization method. The system comprises an evaporator, a condenser, a mother liquid tank, a crystal seed tank, a cyclone, a pump, a valve, and others. When the device is started, an induced crystal seed with the same or approximate scale crystal nucleus is fed in seawater through the crystal seed tank; thus the separated crystal scale formed during the evaporation process is preferentially attached on the surface of the induced crystal seed, thus deposition towards a heat exchange face is blocked; after normal running, mother liquid containing induced crystal grain backflows to a compulsory circular pipeline through the cyclone and the mother liquid tank, and conveys to every efficient evaporator by the compulsory circular pipeline to induce crystal seed; the induced crystal is not required to add. According to the method, the whole flow does not need to add chemical scale inhibitor, the additional influence of chemical scale inhibitor on the environment can be completely removed; meanwhile, the high-power concentration distillation desalting system can realize high power concentration, and greatly reduce raw material seawater intake and reduce the running power consumption on the basis of confirmed water load.

Description

technical field [0001] The invention relates to the technical field of seawater desalination by distillation, in particular to a high-concentration distillation and desalination system based on an induced crystallization method and a seawater desalination method. Background technique [0002] Vigorously developing and utilizing seawater resources and developing seawater desalination technology is an important way to solve the water resource crisis. Seawater desalination has become a major strategic measure for many countries to solve the shortage of freshwater resources and promote sustainable economic and social development. So far, the seawater desalination technologies used industrially mainly include distillation and reverse osmosis. Since seawater is a complex system containing a large amount of salts, the carbonates, bicarbonates, sulfates, chlorides, etc. formed by a large amount of calcium and magnesium ions make it have high hardness, especially the formed calcium s...

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Problems solved by technology

[0006] In addition, dosing chemical antiscalants in the evaporation raw seawater requires setting up a chemical dosing device for the multi-effect distillation seawater desalination system, which increases the initial investment of the equipment to a certain extent. On the other hand, the chemical consumption is large, resulting in Increased system operating costs

Moreover, in the process of distillation and desalination, the chemical agents cannot be fully utilized and decomposed, and some of them will enter the concentrated brine, affecting the discharge water quality of the concentrated brine. Chemical antiscalants are sensitive to the environment and easily cause secondary pollution

[0007] From the above analysis, it can be seen that although the chemical antiscaling technology commonly used in commercial thermal desalination projects has slowed down the scaling rate to a certain extent, there are still problems such as low concentration ratio of the system, high operating costs, and easy environmental impact. additional impact

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