Simulation On Desulfurization Characteristics By Seawater In Double-effect And Gas-liquid Cocurrent Flow Process

Seawater flue gas desulfurization technology is a new type of wet desulphurization technology which use weak alkaline of natural seawater absorb SO2 in flue gas,and has a broad prospect of application in coastal power plants.In this paper, using Aspen Plus process simulation software to build cocurrent flow model independently, the methods to build cocurrent flow model was put forward, and the accuracy of the model was verified by experiments. Based on the process of the single-effect and gas-liquid cocurrent flow, the process of double-effect and cocurrent flow researched by hebei university of technology were simulated.The influence of some parameters on desulfurization efficiency and pH of the discharge liquid were studied, the parameters include: seawater temperature, seawater alkalinity, seawater quantity,flue gas temperature,flue gas concentration, flue gas flow, liquid-gas ratio; and compared withsingle-effect process in the same operating parameters.Results show that: the desulfurized efficiency increase, as the flue gas temperature reduce, as seawater temperature reduce, as flue gas concentration reduce, as flue gas flow reduce, as seawater quantity increase, as liquid-gas ratio increase, as seawater quantity increase; Liquid gas ratio on discharge liquid pH is significant, the discharge liquid p H increase, as liquid-gas ratio increase.The influence rule of process parameters on the single effect and double process almost same. But under the same conditions, double process efficiency is always higher than the single effect of desulfurization efficiency,And discharge liquid pH is always lower than single effect process. The desulfurization efficiency of double process improved obviously, in order to provide the theoretical basis for development and research of double-effect process.