System and technology for utilizing low-temperature smoke to enhance concentration of brine wastewater

Abstract

The invention discloses a system and a technology for utilizing low-temperature smoke to enhance concentration of brine wastewater. The system comprises a flue, a first water pump, a wastewater pressurizing pre-heater, a water distributing device, a falling film flash evaporator and a water collecting tank, wherein the water distributing device is arranged at the upper end of the falling film flash evaporator; the water collecting tank is arranged at the bottom of the falling film flash evaporator; the water distributing device and the falling film flash evaporator are both arranged in the flue; the first water pump is used for conveying the pressurized brine wastewater to the wastewater pressurizing pre-heater; the low-temperature smoke in the flue can heat the brine wastewater pressurized in the wastewater pressurizing pre-heater so as to acquire high-temperature high-pressure brine wastewater; the high-temperature high-pressure brine wastewater is uniformly distributed by the water distributing device and then the pressure is reduced and a layer of uniform water film is formed on the falling film flash evaporator; and the water film is in direct contact with the low-temperature smoke in the flue and is evaporated, so that the brine wastewater can be concentrated. According to the invention, the low-grade waste heat energy is utilized to realize the evaporation and concentration of the brine wastewater, so that the wastewater treatment cost is lowered. A new method is supplied for performing low-cost treatment of the brine wastewater.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a system and process for using low-temperature flue gas to strengthen the concentration of salty wastewater. Background technique [0002] Saline wastewater is produced in a wide range of ways, and the amount of water is increasing year by year. Its discharge will inevitably lead to mineralization of water resources and alkalization of soil. Relevant national and provincial standards have successively increased the total salt content index, but compared with the desalination technology of "zero discharge" and "near zero discharge" of high-salt wastewater in developed countries, my country has a big gap. In April 2015, my country promulgated the "Water Pollution Prevention and Control Action Plan" (referred to as "Water Ten Measures"), which proposed the most stringent source protection and ecological restoration quality, comprehensively controlled pollutant discharg...

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Problems solved by technology

[0007] However, if the low-temperature flue gas is directly used to evaporate and concentrate saline wastewater, since the temperature of the low-temperature flue gas is only 80°C to 150°C, the temperature difference between the low-temperature flue gas and the saline wastewater is small, so that the transmission between the low-temperature flue gas and the saline wastewater The heat and mass transfer efficiency is poor, which reduces the treatment efficiency of salty wastewater

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