高含CO2天然气运输管道缓蚀剂的筛选

大多数天然气藏CO2含量为10%~98%,CO2在不同的温度、压力条件下腐蚀极其严重。文章主要针对高含CO2天然气运输管道腐蚀的问题,开展缓蚀剂的筛选,重点开展CO2腐蚀规律研究与实验,评价环境温度、CO2分压、流动速度对腐蚀规律的影响,明确缓蚀剂的影响因素,结合管材的材质,优选评价不同类型的缓蚀剂,缓蚀效率分别为90.53%和92.64%,在管道凝液介质的气相及液相中都有较高的缓蚀效率。通过设计现场加药工艺及制度,监测评价缓蚀剂缓释效果和腐蚀情况,可防止管道运输过程中CO2腐蚀的侵害,长输管线内腐蚀控制良好。     

油气田含油污泥处理相关标准解析

通过对目前已出台油气田含油污泥处理相关标准的解析,针对标准之间存在着适用范围不一致、检测项目名称及限值不一致、检测方法不统一以及计算基础不统一等,造成油气田环保工作者和管理者认识上的混乱,对含油污泥处理技术的选用和治理市场的管理带来诸多问题。为加快促进油气田含油污泥处理减量化、资源化、无害化技术的发展,建议尽快出台有针对性、普适性强、统一的油气田含油污泥污染控制标准,确保含油污泥处理既科学合理,又经济可行;同时制定针对性强的含油污泥污染物检测方法,检测方法统一、计算公式一致,保证结果真实可靠,具有可比性。     

包装企业有机废气深度处理技改实例探讨

有机废气的治理方法有很多,应选择合适的治理方法或组合来提高处理效率,来着力改善大气环境质量。以某包装企业有机废气深度处理技术改造项目为实例,探讨采取RTO焚烧法取得的治理效果。     

Experimental research of LNG accidental underwater release and combustion behavior

Evaluating potential hazards caused by accidental LNG release from underwater pipelines or vessels is a significant consideration in marine transportation safety. The aim of this study was to capture the dynamic behavior of LNG jet released under water and to analyze its vapor dispersion characteristics and combustion characteristics on the water surface during different release scenarios. Controlled experiments were conducted where LNG was jet released from a cryogenic storage tank. The dynamic process of LNG being jet released from orifices of different sizes and shapes, as well as the rising plume structure, were captured by a high-speed camera. The leakage flow rate and pipeline pressure were recorded by a flow meter and pressure gauge, respectively. The concentration distribution that emanated from the water surface was measured utilizing methane sensors in different positions with various wind speeds. The flame combustion characteristics of LNG vapor clouds, which immediately ignited upon the enclosed water tank, were also recorded. Additionally, the mass burning rate of the flame on the water surface was evaluated, and a new correlation between the ratio of flame length and width was established. The results indicated a large dimensionless heat release rate (Q*) and a continuous release flow rate in a limited burning area. This study could provide greater understanding of the mechanisms of LNG release and combustion behavior under water.     

机动车尾气污染及防治对策研究

汽车是当今社会中人们最重要的代步工具,在人们的日常生活中占据着不可替代的位置。随着我国经济快速发展,城市机动车数量不断增加,导致尾气污染问题也日益严重,这不仅对大气质量造成了不良影响,同时也严重危害到了人们的身体健康。因此,机动车尾气污染问题必须得到有关部门高度重视,并且结合造成污染加剧的主要原因,找到机动车尾气污染防治的有效对策。本文将针对机动车尾气污染危害及防治对策进行分析。     

挥发性有机废气治理技术的现状与进展

本文通过查阅文献资料,总结了当前企业挥发性有机废气产生情况、政策管理办法以及相关处理技术,并分析了未来挥发性有机废气治理政策发展趋势,旨在提高挥发性有机废气治理效率,提高空气环境质量。     

基于VOCs有机废气处理技术研究进展

随着经济的不断发展,环境污染因素的种类越来越多,而且危害性也在逐渐提升。其中有机废气在人类社会不断发展的背景下产生量排放量都越来越高,如果不进行处理将对环境和人体都造成极其严重的影响。本文主要对基于VOCs有机废气处理技术的相关研究作了分析,希望对有机废气的处理有一定促进作用。     

Dissipation of Endosulfan and Dichlorvos Residues In/On Cauliflower Curds

Dissipation behaviour of endosulfan and dichlorvos in/on cauliflower, variety Snowball-16, was studied during rabi season (Sep.–March) 2003–2004. Endosulfan and dichlorvos were sprayed @ 350 and 110g a.i. with 115 g a.i., respectively, 80 days after transplanting. Samples were taken at the interval of 0 (1h after spray), 3, 5, 7, and 10 days after spray (DAS) in triplicate and residues were estimated on GC-ECD system equipped with capillary column. The initial deposits of 3.452 and 0.295μgg⁻¹ of endosulfan and dichlorvos dissipated to 0.084 (97.56%) and 0.009 (96.95%), respectively after 10 DAS. Residues of endosulfan reached below maximum residue limit of 2μgg⁻¹ one day after spray and of dichlorvos were below MRL value of 0.5μgg⁻¹ even on 0 day. Dissipation pattern followed first order kinetics for both the insecticides with half life periods of 1.81 and 2.08 days for endosulfan and dichlorvos, respectively.     

气相色谱法直接测定水中微量有机胺

用配有氢火焰离子化检测器（FID）的气相色谱仪直接测定水中多种微量有机胺。试样经过滤后直接进样,在气相色谱仪上使用CP7448毛细管柱,用外标法测定水中微量甲胺、二甲胺、一乙胺、二乙胺的含量。在所选择的色谱操作条件下,甲胺、二甲胺、一乙胺、二乙胺的质量浓度分别在一定范围内与峰面积呈良好的线性关系。4种组分的回收率分别为96.7％,99．0％,101．2％,99．2％;精密度分别为4．3％,3．7％,5．5％,3．1％;检出限分别为2．0,2．0,1．5,1．5mg/L。该方法操作简便,回收率、精密度高。