Ultra-low-energy consumption flash evaporation concentration system for zero discharge of desulfurization wastewater and industrial salty wastewater

Abstract

The invention discloses an ultra-low-energy consumption flash evaporation concentration system for zero discharge of desulfurization wastewater and industrial salty wastewater. The system comprises aflash concentrator, a water-water heat exchanger, a jet device and a fluidized bed dryer, wherein a partition plate, a mist eliminator, an atomizing nozzle and a condenser are arranged inside the flash concentrator, the inlet of the atomizing nozzle is connected with the refrigerant outlet of the water-water heat exchanger, and fresh salty wastewater and a part of concentrated wastewater are introduced from the refrigerant inlet of the water-water heat exchanger; the bottom of the flash concentrator is connected with the inlet of the fluidized bed dryer through the concentrated wastewater, theheating medium of the water-water heat exchanger is low-grade circulating hot water, and the outlet of the condenser of the flash concentrator is connected with the inlet of the jet device; and cooling water is introduced from the inlet of the condenser, and a suction chamber of the jet device is connected with the exhaust mouth of the flash concentrator, so that a vacuum state of the flash concentrator is maintained. The source of fluidizing air of the fluidized bed dryer is hot air or hot flue gas, dried crystalline salt is discharged from the top into a dust collector for collection, and the system has the advantages of zero discharge of the wastewater, zero energy consumption of treatment, small system equipment, low cost and safety and stability.

Description

technical field [0001] The invention relates to an industrial wastewater treatment technology, in particular to a zero discharge system for ultra-low energy consumption flash concentrated desulfurization wastewater and industrial saline wastewater. Background technique [0002] The main force of my country's electricity production is still coal-fired power plants, accounting for more than 70%. Coal-fired power plants will produce various wastewater during operation, mainly including desulfurization wastewater, circulating cooling system sewage, acid-base wastewater and domestic sewage. Among them, desulfurization wastewater has complex components and many types of pollutants (mainly containing suspended Supersaturated sulfite and heavy metal ions) have become the main difficult-to-treat wastewater in thermal power plants. With the increasing environmental protection standards, zero-discharge technology for desulfurization wastewater from thermal power plants is imperative. ...

AI Technical Summary

Problems solved by technology

However, it is difficult to transform the flue, the resistance between the drying tower and the air preheater is not easy to match, and the energy consumption is high

Another method is to directly spray desulfurization wastewater into the flue at the entrance of the electrostatic precipitator, and use low-temperature flue gas to evaporate the desulfurization wastewater to dryness. However, due to the low temperature of the flue gas in actual operation, the desulfurization wastewater does not evaporate completely, resulting in Severe fouling of nozzles and nozzles, severe corrosion of electrode plates near the dust collector inlet

[0009] The treatment method for saline industrial wastewater is also similar to that of desulfurization wastewater, mainly heat treatment, including multi-stage flash evaporation, multi-effect evaporation and mechanical vapor recompression technology. The main problems encountered are high energy consumption, high cost, and high efficiency. Low and severe equipment corrosion

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