Study On Modified Absorbent Of Spray Dryer Absorbe

Spray Dryer Absorber（SDA）is a semi-dry desulfurization technology widely used in the steel industry.It has the advantages of low equipment investment,small floor space,and basically no waste water discharge.It is obtained in the steel industry.A wider range of applications.However,due to its low desulfurization efficiency,it is difficult to meet the ultra-low emission requirements.It is urgent to optimize and improve the SDA tower,study the factors affecting the desulfurization process,and improve the desulfurization efficiency.In this paper,the effects of factors such as sulfur dioxide concentration, absorbent mass,reaction temperature,flue gas flow rate and water replenishment on the desulfurization efficiency of the absorbent were investigated by using the experimental platform.The effects of SO₂ concentration,absorbent mass,reaction temperature and flue gas flow rate on desulfurization efficiency were investigated.The two grades of the absorbent were modified by various additives using industrial grade Ca（OH）₂ and reagent grade Ca（OH）₂ as main components.After a large number of experiments,the effects of mass ratio,reaction temperature and gas flow rate on the removal efficiency were determined,and the optimum process conditions were determined.Under the condition of SO₂ concentration of 1000mg/m³,when adding 10%sodium hydrogencarbonate to industrial grade Ca（OH）₂,the rate of wetting water is determined to be 200μL/min,the amount of absorbent is 1g,and the temperature of flue gas is 130°C,the reaction temperature is 80°C;when adding 7%sodium bicarbonate to the reagent grade Ca（OH）₂,determine the wet water rate is 200μL/min,the amount of absorbent is 1g,the flue gas temperature is 130°C,the reaction temperature It is 90°C.The optimum modified industrial grade Ca（OH）₂ absorbent has a desulfurization efficiency of 90.24%,and the reagent grade Ca（OH）₂ modified absorbent has an efficiency of 96.9%.At the same time,50%humate was added to the industrial grade Ca（OH）₂,and the simultaneous desulfurization and denitrification experiments under the above conditions were carried out.The desulfurization efficiency was close to 100%,and the denitration efficiency was 61.3%.