【摘要】 化学吸收法作为当前烟气碳捕集的重要手段已经广泛应用于各项示范工程中，其中钠碱法相较于当前主流吸收法具有低挥发、低毒性、低成本的优点。为了应对烟气中的酸性气体CO₂以及干法脱硫脱除SO₂后的含Na₂SO₄废水，利用双极膜电渗析法将电解Na₂SO₄与NaOH捕集CO₂相结合，对不同条件下的电解效率和NaOH产率进行了分析，探究了在吸收平衡实验和喷淋塔中NaOH捕集CO₂的效果，并比较了不同条件下的NaHCO₃结晶量。结果表明，双极膜电渗析可以使Na₂SO₄有效电解为NaOH。CO₂吸收平衡实验表明电解产物NaOH相对于Na2CO₃具有更高的CO₂吸收量和吸收速率，且乙醇胺（MEA）能进一步加强NaOH对CO₂的吸收效果。当温度为50℃和液气比为167时，喷淋塔中CO₂捕集效果最佳，吸收量达到CO₂理论吸收值的98.67%，可获取结晶细小的棒状NaHCO₃粉末，最大的结晶量可达22.447g。更多还原

【Abstract】 As an important means of carbon capture in flue gas, chemical absorption has been widely used in various demonstration projects. Among them, the sodium alkali method has the advantages of low volatility, low toxicity and low cost compared to the current mainstream absorption method. In this paper,to deal with the acidic gas CO₂ in flue gas and the desulfurization wastewater containing Na₂SO₄ after dry desulfurization and SO₂ removal, electrolytic Na₂SO₄ and CO₂ capture by NaOH aqueous solution were coupled to analyze the electrolytic efficiency and NaOH yield under different conditions, explore the absorption effect of CO₂ capture in absorption equilibrium experiment and spray tower, and compare the crystallization amount of NaHCO₃ under different conditions. The electrolysis efficiency and NaOH yield under various conditions were analyzed. The CO₂ absorption equilibrium experiment showed that the electrolytic product NaOH had a higher absorption amount and absorption rate than Na2CO₃, and MEA could further enhance the CO₂ absorption effect of NaOH. When the temperature was 50℃ and the liquidgas ratio was 167, the CO₂ capture effect in the spray tower was optimal with an absorption rate of 98.67%.Fine crystalline rod-shaped NaHCO₃ powder can be obtained and the maximum crystallization amount can reach 22.447g.更多还原