CEMS预处理运行预警装置设计及测试

针对常规的烟气排放连续监测系统（CEMS）预处理装置容易堵塞、漏气的问题,设计开发了一种CEMS预处理运行预警装置,可实现对系统堵塞、漏气等故障的预警,并及时通知指定用户报警信息。经测试,系统40 min连续通信测试丢包率为1.25%,可满足系统需求。停炉时,现场测试发现伴热管温度、探头温度和冷凝器温度对相邻的下一个测点温度会产生一定影响,烟气流量与测点压力呈线性相关。通过模拟管路堵塞、漏气,明确了系统发生堵塞、漏气时测点压力的变化规律,可为后续系统的预警阈值范围设定提供相应理论支持。     

烟气在线监测系统现状及发展趋势

针对烟气在线监测系统的发展问题,本次研究首先对烟气在线监测系统的发展现状进行深入分析,在此基础上,提出烟气在线监测系统的发展趋势,为推动烟气在线监测系统的进一步发展奠定基础.研究表明:目前常见的烟气在线监测系统可以分为四种类型,分别是空气质量自动监测系统、烟气排放连续监测系统、差分光学吸收光谱法在线连续监测系统以及物联...     

PreGASS预处理系统整体解决方案在水泥行业CEMS上的应用研究

水泥行业超低排放的脱硫脱硝工艺需要对烟气排放进行监测的CEMS烟气在线监测系统,CEMS系统面临着冷凝水析出、氨逃逸（铵盐结晶）和碳氢化合物的诸多问题。通过采用高温填料固态反应法的除氨器、以Nafion管干燥器为核心的除湿系统、以高温氧化为核心的除烃系统,并辅之以定制化的现场服务,构成了PreGASS预处理系统整体解决方案。成功地应用于水泥窑尾烟气冷干直抽法CEMS和热湿法CEMS的预处理,满足了国标对CEMS预处理系统的要求。     

水泥窑窑尾烟气控硫措施与实践

0 前言 我公司2 500 t/d熟料生产线,烟气在线采用雪迪龙SCS900C型烟气连续检测系统.因地处河北省邢台市沙河市,面临严峻的环保形势,环保设施运行的管控也更加精准.我公司在烟气系统增加了预处理系统后,由于消除了烟气中冷凝水和铵盐结晶的影响,生料磨停机状态在线SO2排放值达到150 mg/m3,不能满足超低排放...     

连续重整装置铵盐结晶分析及处理

连续重整装置预加氢系统进料/反应产物换热器E101管程出口发生铵盐堵塞,造成循环压缩机出口压力逐步上升,而循环氢流量却明显下降。针对此换热器铵盐结晶问题查找原因,对出现铵盐结晶的原因及结晶形成过程进行深入分析,提出改造措施,为国内同类装置长周期安全生产提供可借鉴的实践经验。     

基于PLC的在线水质监测系统

为了实现水质的在线自动监测和环境技术管理工艺全过程的多点连续水质指标测试,在环境技术验证评估移动工作站内设计了基于PLC的集自动采样、预处理、在线水质自动监测与数据处理为一体的在线水质监测系统。实际运行结果表明:该系统测量准确、快速,可以稳定地自动运行。     

四氯乙烯副产高废物焚烧烟气碱洗塔防结晶堵塞措施

在四氯乙烯生产过程中,副产高废物焚烧系统的烟气碱洗塔经常发生堵塞,分析了碱洗塔堵塞的原因,根据装置运行情况总结了几项防结晶堵塞的措施.     

火电厂烟气在线监测及排放控制研究

燃煤电厂作为大气环境污染排放的重要来源,对其排放的烟气进行连续在线监测具有积极的意义。介绍了江苏某火电企业采用的CEMS-8000烟气在线监测系统,对其运行环境、流程及故障处理进行了分析,论述了对火电厂烟气进行监测和排放控制的重要作用和意义。     

气化装置洗涤塔出口粗水煤气在线分析仪预处理系统改造

对气化装置洗涤塔出口粗水煤气在线分析仪预处理系统进行改造,解决了原有预处理在使用中出现的问题。     

气化装置洗涤塔出口粗水煤气在线分析仪预处理系统改造

对气化装置洗涤塔出口粗水煤气在线分析仪预处理系统进行改造,解决了原有预处理在使用中出现的问题.     

烟气排放连续监测系统的改造

烟气连续监测系统是烟气排放在线监测和排污计量系统,可对锅炉等固定朽染源排放烟气中的颗粒物、气态污染物的浓度和排放率进行连续地、实时地跟踪测定。在火电厂治污减排、节能降耗中有着重要作用。文章通过介绍韶关钢铁集团公司热电站锅炉烟气连续监澜系统的组成、各部分功能,并对此系统在应用中存在的问题进行分析,探讨相应采取的有效措施。该套系统改进后运行正常,减少维护量,减少数据偏差。有效监控烟气污染物排放,为热电厂实现烟气达标排放创造条件。     

RFS09烟气硫转移助剂在催化裂化装置中的应用

为了降低催化裂化再生烟气中SO_2的排放浓度,某石化有限责任公司催化裂化装置按照稀土助燃剂的添加方式,往再生系统加入烟气硫转移助剂RFS09。试用结果表明,该催化裂化装置在正常开工期间、不做任何工艺技术改造的情况下,只要通过加注烟气硫转移助剂RFS09,便可以实现烟气中SO_2达标排放,并且烟气硫转移助剂RFS09的加入对催化裂化催化剂的性质、产品分布及产品性质无明显影响。     

烟气验收监测数据影响因素探讨

烟气监测是环境监测工作中的重点,是废气排放源的必测项目。仪器、采样操作及实验过程对数值影响因素较大。本文从点位选择,仪器操作、实验操作等方面论述了对烟气采样的影响因素,为环境监测提供参考。     

浅对烟气分析仪在污染源监测中准确性的探讨

文章针对烟气分析仪在污染源监测中容易引起监测数据偏差的因素做系统分析,结合烟气成分、电化学气体传感器工作原理及适用性、气体交叉干扰特性、做好仪器的检查校准和仪器的正确操作与预处理等方面,提出使用过程中的质量控制要点,以保证烟气分析的准确性。     

Development of a gas-cleaning system for a scrap-tire vacuum-pyrolysis plant

When used tires are subjected to heat in the absence of air, large quantities of vapours and gases are produced. A large portion of the vapours can be condensed to oils with a yield of 55% by weight. However, the non-condensable gas phase (6% yield) is contaminated with oil droplets, tar, fine particles as well as nitrogen- and sulphur-compounds. The project objective is to develop a gas-cleaning system and design a pumping unit that can maintain the total reactor pressure below 10 kPa and burn the process gas without emission problems. A series of experiments was made in a 25 kg h⁻¹ vacuum-pyrolysis process-development unit, for which different gas-cleaning units such as a shell and tube heat exchanger, cold traps, cyclones, demisters and filters were tested. A gas burner with a variable orifice was used to burn the pyrolysis gas efficiently. Standard stack sampling was performed to identify the flue gas contaminants. Gas burning in general was successful, but the gas-cleaning system could not remove all the contaminants in the gaseous stream. According to preliminary experimental results, an alternative promising approach is to replace the shell and tube exchanger, cold traps and filters by a liquid-ring vacuum pump.     

Semi-conductor metal oxide gas sensors for online monitoring of oak wood VOC emissions during drying

This study presents a semi-conductor metal oxide gas sensor system for the online flue gas monitoring during oak wood drying. Oak wood flakes and solid oak wood were heated on laboratory scale. The emissions were analyzed by gas chromatography–mass spectrometry and monitored by a semi-conductor metal oxide gas sensor setup. The calibrated sensor system was able to detect different drying and degradation stages of the oak wood flakes by online monitoring acetic acid and furans/methoxyphenols at 25–240?°C. The system also allowed a monitoring of acetic acid emission from solid wood at 75?°C. This sensor application has the potential to online monitor the flue gas of oak lumber drying and optimize the drying process.     

鲁奇炉气化生产中在线分析仪器的选择和运用

概述了鲁奇炉气化过程中粗煤气组分监测的各种方法。针对工艺控制需连续监测各组分的要求,通过对煤气组分监测方法的选择、样气预处理系统的设计、煤气各组分对分析仪器干扰的比较,合理选择3种分析仪器结合成1套分析系统,实现粗煤气连续在线分析。在线分析仪投运后,煤气组分含量可直接显示到DCS,为生产安、稳、长、满、优创造了可靠的条件。     

乙醇胺(MEA)法燃煤电厂CO2捕集系统尾气二次污染分析

在某燃煤电厂用乙醇胺(MEA)作吸收剂进行了CO₂燃烧后捕集中试,并对系统的排放物进行了分析。吸收塔尾气和再生气用GASMET烟气监测系统进行在线监测,可得到二者组分及含量。结合电厂烟气、连续监测系统(CEMS)数据及实验室溶液分析,根据烟气数据对MEA的挥发及降解情况作了研究,比较了系统前后烟气组分的变化,讨论其尾气对环境是否造成二次污染。试验结果表明:MEA在吸收塔中主要发生氧化降解,在再生塔中主要发生热降解,且溶剂损耗主要来自氧化降解和挥发;降解的主要产物为NH₃和乙醛,二者在气体中含量变化情况与溶液中MEA浓度变化基本一致;预洗塔能除去原烟气中部分酸性气体。故CO₂捕集系统可以进一步减少电厂净烟气中的原有污染物,但也会产生新的污染组分。新生成的污染物含量很少,符合国家标准,不会造成二次污染。     

烟气脱硫（FGD）用循环干式洗涤器

燃煤电厂建设前必须考虑满足环保部门的严格排放要求。本文介绍循环干式洗涤器烟气脱硫技术，该法以化工工艺中的流化床为工艺基础，以石灰为ＳＯ２吸收剂，用向烟气中喷入少量水陴低烟气温谋和提高ＳＯ２脱除率，用吸收剂循环提高石灰利用率。     

COMPARISON AND VALIDATION OF OHM AND SCEM MEASUREMENTS FOR A FULL-SCALE COAL-FIRED POWER PLANT

Mercury emission measurements were performed at a 250 MW coal-fired power plant using the Ontario Hydro method (OHM) and semi-continuous emission monitors (SCEM). Flue gas sampling was performed at the inlet of the air preheater and at the outlet of the electrostatic precipitator. The results indicated that there is some agreement between the OHM and SCEM measurements on the total mercury species. However, the SCEM results were not always in good agreement with the OHM measurements on the elemental mercury species. These discrepancies in elemental mercury concentrations are probably the result of the differences in the location of the SCEM and OHM probes, the temperature difference between the SCEM sampling probe and the flue gas, and the nonuniformities in mercury concentration over the flue gas duct cross section. The other factor that contributed to the deviation between the SCEM and OHM measurement results is the sampling method: the SCEM measurements were performed at a single point while the OHM probe was traversed over multiple points over the duct cross section and the results were averaged. The effect of the SCEM sampling probe temperature was investigated by designing a sampling probe that could be heated to the sampled flue gas temperatures. This resulted in improvements in the accuracy of the elemental mercury measurements by the SCEM system.