【摘要】 活性炭喷射（activated carbon injection,ACI）是燃煤电厂烟气高效脱汞技术。采用1%NH₄Br溶液对稻壳活性炭浸渍改性,制备NH₄Br改性稻壳活性炭（Br-RHC）脱汞吸附剂。利用比表面积分析仪（Brunauer-Emmet-Teller,BET）、扫描电子显微镜（scanning electron microscope,SEM）和X射线衍射（X-ray diffraction,XRD）等表征手段对吸附剂的理化性质进行了表征。在0.3MW（th）燃煤循环流化床锅炉中试装置上,进行了改性稻壳活性炭吸附剂烟气喷射脱汞试验研究。结果表明:吸附剂改性后的比表面积、微孔容积与总孔容积均有一定程度的增加;改性后吸附剂孔隙结构发达,石墨化程度较高,NH₄Br以非晶体形态担载在吸附剂表面。喷射脱汞效率随着喷射量的增大先增加后稳定,在碳汞比为16000时脱汞效率为79.44%。喷射脱汞效率随着喷射温度的升高而升高,由142℃的57.74%升高为200oC的79.48%。烟气中SO₂对喷射脱汞效率有抑制作用,NO对喷射脱汞效率有促进作用。汞排放浓度为0.35mg/m³,污染物控制装置（air pollution control devices,APCDs）对烟气中Hg⁰、Hg²⁺与Hg^p的协同脱除率分别为98.83%、88.00%与100%。更多还原

【Abstract】 Activated carbon injection（ACI） is known as high efficient mercury removal technique in coal-fired power plant. 1% NH₄ Br solution impregnation modified rice husk activated carbon（Br-RHC） was prepared as mercury adsorbent.Physicochemical characteristics of Br-RHC were investigated by using different analysis techniques of Brunauer-EmmetTeller（BET）, scanning electron microscope（SEM） and X-ray diffraction（XRD）. The sorbent injection for flue gas mercury removal experiment was carried out in a 0.3 MW（th） coal-fired circulating fluidized bed boiler system. The results showed that the specific surface area, micro pore volume and total pore volume increased, the pore structure of the adsorbent was developed, the degree of graphitization was high, and NH₄ Br was loaded on surface of the adsorbent in an amorphous form,after modification. The mercury removal efficiency of sorbent injection elevated first and then stabilized with increase of the injection amount, reaching 79.44% at a ratio of carbon to mercury of 16000. The mercury removal efficiency raised with increase of the flue gas temperature, which is from 57.74% at142℃ to 79.48% at 200℃. The mercury removal efficiency of sorbent injection is restrained by SO₂ concentration in the flue gas, while is promoted by NO. The total mercury emission concentration to the air was 0.35μg/m³, and the synergistic removal rates of air pollution control devices（APCDs） for Hg⁰, Hg²⁺ and Hg^p in flue gas were 98.83%, 88.00% and 100%, respectively.更多还原