High-salt organic wastewater evaporation method and device based on energy gradient utilization

Abstract

The invention provides a high-salt organic wastewater evaporation method and device based on energy gradient utilization. High-salinity organic wastewater enters high-temperature evaporation equipment, then high-temperature flue gas in a combustion chamber is introduced into liquid in the high-temperature evaporation equipment, then bubbling is performed, liquid steam is taken out and enters an exhaust pipe above the high-temperature evaporation equipment, a separation tower is arranged in the exhaust pipe, the flue gas enters a heat exchanger after passing through the separation tower, and the heat exchanger is communicated with the high-temperature evaporation equipment. The method comprises the following steps: performing heat exchange on flue gas and high-salinity organic wastewater in low-temperature evaporation equipment, mixing the low-temperature flue gas subjected to heat exchange with exhaust gas of the low-temperature evaporation equipment, performing heat exchange on the mixed gas and air entering the low-temperature evaporation equipment, discharging the heated air into the low-temperature evaporation equipment, performing low-temperature evaporation, performing primary treatment on the high-salinity organic wastewater by the low-temperature evaporation equipment, and performing secondary treatment on the high-salinity organic wastewater. And the liquid is discharged through a liquid outlet and enters the high-temperature evaporation equipment again for further treatment. According to the process, waste heat generated by direct contact evaporation can be fully utilized, the energy consumption of the system is reduced, and the operation cost of the system is reduced.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method and device for evaporating high-salt organic wastewater based on energy cascade utilization. Background technique [0002] The main sources of high-salt organic wastewater are petrochemical, coal chemical, pharmaceutical, printing and dyeing and other production processes and other wastewater treatment processes such as electrodialysis (ED), nanofiltration membrane (NF), reverse osmosis (RO), etc. Such wastewater also has a large amount of free inorganic ions, and in addition, usually contains a large amount of organic components. And due to different sources, the composition of various high-salt organic wastewater is complex and changeable, which increases the working conditions of the treatment process and increases the difficulty of treating such wastewater. [0003] At present, the treatment methods of high-salt organic wastewater are mainly membrane method, thermal ...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of excessive energy consumption when treating high-salt organic wastewater. Based on the existing technology, a method and device for evaporating high-salt organic wastewater based on energy cascade utilization are proposed

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