Process and energy consumption analysis of high salt and high COD wastewater treatment by submerged combustion
Submerged combustion technology has the advantages of high heat transfer efficiency,resistance to crystallization and scaling,and wide treatment range in treating high salt and high chemical oxygen demand(COD)wastewater.An experimental platform used this technology was designed and constructed independently to study the heat transfer characteristics of gas-liquid two-phase flow in the conventional submerged combustion process,and to analyze the ability of key operating parameters of submerged combustion in treating high salt and high COD wastewater with different concentrations.On this basis,in order to further improve the energy efficiency,the evaporation performance under different submerged tube structures was compared.The experimental results show that increasing gas flow rate and submergence depth is conducive to improving the temperature rise rate and shortening the evaporation time.The COD removal rate decreases with the increase of organic solution flow rate and initial COD value of organic solution,in which the organic solution flow rate has a more obvious effect on the COD removal efficiency.The use of flat plate porous plate and conical porous plate submerged tube structure can improve the distribution of high-temperature flue gas and improve evaporation efficiency and thermal efficiency,but it is not conducive to the stability of the back pressure of the submerged tube,resulting in increased liquid level fluctuations.Compared with the traditional single-effect evaporation and crystallization energy consumption,submerged combustion device operating energy consumption decreases,the total operating costs reduce by 28.3%,the economic performance has been improved.
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