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Classification of industrial wastewater |
| Publisher: Suzhou Huanke Pharmaceutical Equipment Technology Co., Ltd Time：2023-03-07 15:00:42 Number of clicks：269 Close |
Multi-effect evaporation processor is mainly used to treat industrial wastewater with high concentration, high chroma and high salt content. At the same time, the waste water treatment process produced byproducts. Low steam consumption, low evaporation temperature, large concentration ratio, more reasonable, more energy saving, more efficient. Today we introduce the application of multi - effect evaporator in wastewater treatment!
The first is according to the chemical properties of the main pollutants contained in the industrial wastewater classification, inorganic pollutants mainly for inorganic wastewater, organic pollutants mainly for organic wastewater. For example, electroplating wastewater and mineral processing wastewater, is inorganic wastewater; Wastewater from food or petroleum processing is organic wastewater. The second is classified according to the products and processing objects of industrial enterprises, such as metallurgical wastewater, papermaking wastewater, coking gas wastewater, metal pickling wastewater, chemical fertilizer wastewater, textile printing and dyeing wastewater, dye wastewater, leather wastewater, pesticide wastewater, power station wastewater, etc.
The third is classified according to the main components of the pollutants contained in the wastewater, such as acid wastewater, alkaline wastewater, cyanide wastewater, chromium wastewater, cadmium wastewater, mercury wastewater, phenol wastewater, aldehyde wastewater, oil wastewater, sulfur wastewater, organic phosphorus wastewater and radioactive wastewater.
Technical characteristics of multi - effect evaporation Multi-effect evaporation is the earliest seawater desalination technology, which has been developed into a more mature wastewater evaporation technology to solve the serious problem of scaling, and gradually applied in the direction of high saline treatment. Multi-effect mainly has the following technical characteristics: The heat transfer process of multi-effect evaporation is boiling and condensation heat transfer, which is bilateral phase transition heat transfer, so the heat transfer coefficient is very high. For the same temperature range, the heat transfer area of multi-effect evaporation is less than that of multi-stage flash evaporation. Multi-effect evaporation has less power consumption. Since the generation of fresh water by multistage flash evaporation depends on sensible heat absorbed by brine, and the latent heat is much larger than sensible heat, the production of the same amount of fresh water requires much larger circulation than multi-effect evaporation, so the multistage flash evaporation requires more power consumption. The operation flexibility of multi-effect evaporation is very large, the load range from 110% to 40%, can be normal operation, and will not make the water production ratio drop. Flow chart of low temperature multi effect evaporation process The brine first enters the condenser for preheating and degassing, and then is divided into two streams. One is discharged back to the sea as cooling water and the other as feed for the distillation process. The feed containing brine is added with scale inhibitor, which is introduced into the later effects of the evaporator. The material liquid is evenly distributed to the top row tube of the evaporator through the nozzle, and then flows down along the top row tube in the form of a thin film. Part of the water absorbs the latent heat of the condensed steam in the tube and evaporates. The secondary steam condenses into product water in the next effect, and the remaining liquid is transported to the next effect group of the evaporator by the pump. The operating temperature of this group is slightly higher than that of the previous group. The spraying, evaporation and condensation process is repeated in the new effect group. The remaining liquid is pumped to the high temperature efficiency group and finally leaves the unit as a concentrate in the highest temperature efficiency group. Raw steam is injected into the primary evaporator tube and condensed in the tube, and the brine outside the tube produces a secondary steam of roughly the same amount as the condensate. Because the operating pressure of the second effect is lower than that of the first effect, the secondary steam enters the next effect heat transfer tube after passing through the vapor-liquid separator. The process of evaporation and condensation is repeated in each effect, each effect produces basically the same amount of distilled water, and the steam of the last effect is condensed by the brine in the condenser. The condensate of the first effect returns to the steam generator, and the condensate of the other effects enters the product water tank, and the product water tank of each effect is connected. Because of the different effects of the pressure to make the product water flash, and the heat back to the evaporator. In this way, the product water flows in a step pattern and is cooled by flash step by step, and the heat recovered improves the overall efficiency of the system. The cooled product water is transported by the product pump to the product water storage tank. The resulting water is pure water with an average salt content of less than 5mg/1. From the primary, the brine flows in a step pattern into a series of brine flash tanks, where the superheated brine is flashed to recover its heat. After cooling by flash, the concentrated brine is discharged back to the sea by the concentrated salt pump. The noncondensing gas is enriched in the condenser and extracted by the vacuum pump. |
Suzhou Huanke Pharmaceutical Equipment Technology Co., Ltd.
Suzhou Chenglang Cleaning Equipment Co., Ltd.
Contact: Zhang Gong
Tel：15150275957
Email：285145232@qq.com
Company website： http://www.szhuanke.com
Add：No. 366, Jinxian Road, Jinjiaba Town, Wujiang District, Suzhou City, Jiangsu Province
Su ICP No. 2022043966-1
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