共查询到19条相似文献,搜索用时 343 毫秒
1.
2.
3.
《中国环境管理干部学院学报》2019,(6)
为使某焦化企业的焦炉烟气污染物排放数值符合GB 16171—2012中特别排放值要求,在烟气外排前新建一套"选择性催化还原(SCR)脱硝+氨法脱硫"系统。针对企业情况,确定了"脱硝—换热—脱硫"的基本方案及具体工艺流程。改造后运行数据表明,利用该系统进行烟气脱硫脱硝后,烟气中SO2、NOx及颗粒物排放达标,SO2、NOx减排率可达90%以上。 相似文献
4.
5.
6.
《四川环境》2016,(3)
对某大型钢铁企业三条烧结生产线与一条球团生产线NOx产生情况进行了对比研究,提出了烧结(球团)烟气NOx控制策略。烧结(球团)烟气中的氮氧化物均以NO为主,占NOx总量的比例不低于94%。在温度降低、混合时间延长的特定环境下,高温烟气中的NO能转化为其他含氮气体组分,NOx总量呈下降趋势。球团生产时,因高炉煤气、焦炉煤气含氮而产生的燃料型NOx占烟气氮氧化物排放总量的16.5%,以温度型NOx产生为主;烧结生产工艺中,固体燃料煤或焦末中氮含量高达0.83%~1.26%,烟气中氮氧化物产生以燃料型NOx为主,占烟气中NOx总量的比例不低于80%。烧结(球团)烟气中NOx浓度随烧结机上料量增加呈明显上升趋势。鉴于我国目前仍缺乏成熟的烧结(球团)烟气脱硝末端治理技术与工程应用案例,加强生产过程控制是实现烧结(球团)烟气氮氧化物达标排放的重要举措。 相似文献
7.
“九五”期间江苏省城市大气污染状况及防治对策 总被引:1,自引:0,他引:1
对江苏省省辖市区空气环境质量的变化及其发展趋势进行了分析,并从改善TSP污染、NOx污染、SO2污染等几个方面提出防治对策。 相似文献
8.
9.
本研究利用2010年污染源普查数据和MEIC排放清单建立全国大气污染物高时空分辨率排放清单,在此基础上利用2012年环境统计数据对其进行修订建立2012年全国大气污染物高时空分辨率排放清单;结合《大气污染防治行动计划》(以下简称《计划》)研究工作,测算了《计划》实施后在污染源综合治理、落后产能淘汰、能源结构调整方面对SO2、NOx、颗粒物、VOCs的减排量,同时对污染物新增量进行了预测,建立了《计划》实施后全国大气污染物高时空分辨率排放清单;利用CMAQ空气质量模型模拟分析了《计划》实施的空气质量改善效果。结果表明:《计划》实施后,将可以减少641万吨SO2、859万吨NOx、547万吨颗粒物(不含扬尘污染控制)、627万吨VOCs,全国、京津冀、长三角及珠三角区域PM2.5年均浓度将分别比2012年下降22.08%、33.99%、23.98%、24.04%。如果《计划》要求全部落实,可以实现空气质量改善目标。 相似文献
10.
泸州市大气降水的化学特征及其防治对策 总被引:2,自引:0,他引:2
本文讨论了泸州市2000年3月~2003年2月年度降水的酸碱性、离子组分变化规律与特征,指出泸州市酸雨污染应从总量上控制SO2并从源头上消减SO2的排放量,并预防城市机动车尾气NOx的酸雨沉降污染。 相似文献
11.
12.
The US Acid Rain Program (Title IV of the 1990 Clean Air Act Amendments) has achieved substantial reductions in emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) from power plants in the United States. We compare new estimates of the benefits and costs of Title IV to those made in 1990. Important changes in our understanding of and ability to quantify the benefits of Title IV have occurred. Benefits to human health now take a much higher profile because the contribution of SO2 and NOx emissions to the formation of fine particulate (PM2.5) is substantial, and evidence of the harmful human health effects of PM2.5 has emerged in the last 15 years. New estimates of the health benefits of PM2.5 reductions are the largest category of quantified health and environmental benefits and total over 100 billion US dollars annually for 2010 when the program is expected to be fully implemented. Although important uncertainties exist in any specific estimate of the benefits, even if the estimates were calculated using more limiting assumptions and interpretations of the literature they would still substantially exceed the costs. Estimates of annualized costs for 2010 are about 3 billion US dollars, which is less than half of what was estimated in 1990. Research since 1990 also suggests that environmental problems associated with acid deposition and nitrogen deposition are more challenging to resolve than originally thought and will require larger reductions in emissions to reverse. The greater than expected benefits to human health, the greater vulnerability of natural resources and ecosystems, and the lower than expected costs all point to the conclusion that further reductions in SO2 and NOx emissions from power plants beyond those currently required by Title IV are warranted. 相似文献
13.
14.
15.
16.
17.
18.
结合某煤化工企业主装置配套的废气处理项目,设计一套有机废气焚烧处理工艺,处理企业产生的CH类废气,在保证安全可靠、焚烧产物达标排放的前提下,尽可能降低运行成本。同时利用系统产生的热量,产生副产蒸气,供厂区用气点使用,节能环保。 相似文献
19.
Modified kaolin clays were used as adsorbents for SO(2) gas adsorptions. The clays were heated up to 900 °C previous to acid treatments with 0.5 N sulfuric acid solutions at boiling temperature during different times up to 1440 min. Equilibrium adsorption at 25 °C and 0.1 MPa was carried out by using a volumetric apparatus. The samples were characterized by chemical analysis, X-ray diffraction and infrared analysis. The heating of the clays followed by acid treatment improved the adsorption capacity of the kaolin clays. The presence of amorphous silica and hydroxyl in the final products improved SO(2) adsorption capacity. Better properties for SO(2) adsorption were found in kaolin rich in not well ordered kaolinite clay mineral. 相似文献