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厂界VOCs在线监测设备

TR-9300C型固定污染源VOCs排放连续监测系统是一款兼容全热法和冷干法等多种前处理技术,配置基于先进的气相色谱、质谱等分离技术和FID、PID等的检测方法,测量废气中的总烃(THC)、非甲烷总烃(NMHC)、芳香烃、酯类等挥发性有机气体的成分,并将测量数据远传至环保部门。

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Detailed description

  TR-9300C型固定污染源VOCs排放连续监测系统是一款兼容全热法和冷干法等多种前处理技术,配置基于先进的气相色谱、质谱等分离技术和FID、PID等的检测方法,测量废气中的总烃(THC)、非甲烷总烃(NMHC)、芳香烃、酯类等挥发性有机气体的成分,并将测量数据远传至环保部门。仪表内部采样、进样和检测系统全部采用高温伴热方式,有利于高浓度高沸点样品的准确测量。针对复杂现场应用工况,采用易于防爆设计的结构,可满足石油化工、制药、汽车制造、家具制造、半导体制造、印刷、喷涂等众多行业的监测需求。根据不同监测要求,此仪表具有不同定制化量程可供选择,满足不同用户对VOCs的监测需要。

 

系统结构预处理系统

  在线样品前处理装置采用直接抽取、全程高温伴热技术,有效的减少了样品在传输过程中的损失,保证检测结果的准确性。针对有机废气具有水汽含量高、浓度大、工况复杂等特点,系统采用全程高温法进行样品的传输。从探头、伴热管线到分析仪器内部均采用175℃以上高温伴热,保证测量组分无损失。高温伴热的样品直接进入到色谱系统进行分析检测,得到分析检测结果。

 

VOCs在线分析仪

  JNYQ-THC-51型在线气相色谱仪(含工控机显示屏)采用高温伴热双柱并联反吹色谱分离技术,可以自动测量和分析企业排放的VOCs浓度含量,如甲烷/非甲烷总烃分析通过总烃和甲烷含量的差值计算得到非甲烷总烃的含量,大大缩短了分析周期,同时针对高沸点非甲烷总烃研制的高温伴热技术大幅度减少了高沸点非甲烷总烃的色谱峰展宽,允许仪表对高沸点物质进行准确地测量,甚至在高浓度非甲烷总烃存在的情况下也可以进行该操作。

 

仪器原理

  针对有机废气具有水汽含量高、浓度大、工况复杂等特点,采用全程175℃高温伴热样品传输、高温FID检测器。采用双阀双柱单氢火焰离子化检测器(FID)技术进行甲烷/非甲烷总烃的在线监测,采用双阀三柱单氢火焰离子化监测器(FID)技术进行甲烷/非甲烷总烃和苯系物样品的同时在线监测。

 

分析仪特点

  • 采用EPC技术进行载气压力控制,控压稳定,控压精度优于±0.05kPa。

  • 采用EFC技术进行氢气和空气流量控制,控流精度优于0.5%F.S.。

  • 柱箱控制精度优于±0.1℃。

  • 采用低维护的隔膜泵和定量环进行定体积采样。

  • 采用进口VALCO十通阀/六通阀,维护量低,使用寿命长。

  • 采用双柱并联反吹技术分析非甲烷总烃,减少峰展宽,缩短分析时间。

  • 采用微型的FID检测器,对甲烷和总烃响应较为灵敏。

  • 内置标准工业PC机,高清晰彩色液晶触摸显示屏。

  • 19ʺ标准机箱,结构紧凑,日常维护和操作方便。

 

数据采集与处理子系统

  TR-9300C型固定污染源VOCs排放连续监测系统工控机自动进行监测数据的采集、分析及处理,检测结果数据通过网络连接可以自动上传至企业DCS控制系统,向企业内部的DCS输送检测结果数据和报警信息。

  仪表操作人员在办公室内可以通过安装在工控机上的TR-9300C有机废气自动监测软件监控查询所有测量信息和仪表工作状态信息。可设置监控数据的报警上限和下限浓度值,超出限值自动报警;能够检索任意时间点的监测数据和任意时间段。

Key words:

Flue gas analyzer, flue gas online monitoring, VOCS online monitoring, waste incineration online monitoring

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