Anti-scaling triple-effect evaporation device

Abstract

The invention relates to an anti-scaling triple-effect evaporation device. The device comprises a feeding pump, a first-effect separator, a first-effect forced circulation pump, a first-effect heat exchanger, a second-effect separator, a second-effect forced circulation pump, a second-effect heat exchanger, a third-effect separator, a third-effect forced circulation pump, a third-effect heat exchanger, a discharging pump, a condenser and a condensed water tank. In the device, a first-effect evaporation unit is composed of the first-effect separator, the first-effect forced circulation pump, the first-effect heat exchanger and a pipeline, a second-effect evaporation unit is composed of the second-effect separator, the second-effect forced circulation pump, the second-effect heat exchanger and a pipeline, and a third-effect evaporation unit is composed of the third-effect separator, the third-effect forced circulation pump, the third-effect heat exchanger and a pipeline. Enough circulation flow velocity and material circulation amount in the three evaporation units are guaranteed through the set of forced circulation pumps, so that the anti-scaling purpose is achieved; and meanwhile,secondary steam of the first-effect evaporation unit and secondary steam of the second-effect evaporation unit are adopted as heat sources of the second-effect evaporation unit and the third-effect evaporation unit respectively, so heat energy is fully utilized.

Description

technical field [0001] The invention belongs to the technical field of evaporation and concentration, and in particular relates to an anti-scaling three-effect evaporation device. Background technique [0002] Saline wastewater, especially high-salt wastewater, is a type of wastewater that is produced in large quantities and is extremely difficult to treat in the production processes of chemical, petrochemical, pharmaceutical, and electric power. This type of wastewater is often not a single component, but a mixed wastewater of various salts. It is a common method to treat this type of wastewater by evaporation. Among them, multi-effect evaporation, as a traditional evaporation process, is based on the cascade utilization of steam. Multiple evaporators are operated in series to improve thermal energy utilization efficiency. The application of multi-effect evaporation is flexible and can be operated alone or in combination with other methods. The system operation is safe and...

AI Technical Summary

Problems solved by technology

[0003] Industrial saline wastewater generally has high hardness. If the traditional multi-effect evaporation process is used to treat this kind of wastewater, in order to avoid the deposition of calcium and magnesium ions in the wastewater to form dirt on the surface of the evaporation pipe, the water entering the evaporation system must be softened to remove calcium. Magnesium ions, but this method will greatly increase the operating cost due to the use of a large amount of softener, and will generate a large amount of solid waste that is difficult to handle

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