一、概述
焦炉煤气氧量分析
本过程煤气中氧分析成套系统（以下简称系统）是过程分析仪器与取样预处理装置及其附属的应用保障部分（标准气），通过针对现场应用条件，工艺气样条件的系统设计，所实现的正确匹配与合理组合，使分析仪器能很好适应焦炉煤气的特殊工艺条件。
Detailed description
本过程煤气中氧分析成套系统（以下简称系统）是过程分析仪器与取样预处理装置及其附属的应用保障部分（标准气），通过针对现场应用条件，工艺气样条件的系统设计，所实现的正确匹配与合理组合，使分析仪器能很好适应焦炉煤气的特殊工艺条件。系统能自动、连续、准确、可靠地分析煤气中氧气的体积比浓度含量。采用自动控制系统的采样、排水、探头自动除水、故障监测并处理等操作。系统正常运行期间能同时提供被分析气体的4~20mA标准输出信号；并根据各种测量组份的含量值输出超限报警状态信号。该系统的氧分析仪器采用英国CT公司原装进口传感器。系统技术方案先进、结构简明、部件性能可靠、自动化程度高、操作简便、维护量小、是监测气化炉煤气中氧或其它各种气体含量的理想设备。
二、方案设计
根据现场实际情况，在C37电扑焦油器出口和C25电扑轻油器出口安装气体取样探头，两个取样点共用一个分析柜，通过循环取样检测的方式达到对电扑焦油器的安全预警控制。分析仪所检测的氧含量通过4—20mA模拟信号方式送给中控显示，气体分析系统和电扑焦油器进行连锁，将氧含量控制在0.6%以下，一旦氧含量高于0.6%，系统继电器闭合，电扑焦油器断电，以保证电扑焦油器安全可靠的运行。该系统为防爆型设计，全天候增压条件下运行。
三、工作原理
参照系统流程图，当按下系统“启动”键后，被测样气在膜片泵的抽取下，首先在取样探头内进行冷却、过滤、净化，通过探头上的取样电动球阀和输送管线进入系统的预处理装置。先由瞬间降温后进入气液分离器，使样气中流动的水份和冷凝水充分有效的过滤分离，然后进入稀释器净化微量的焦油和萘，之后经冷凝除湿器处理，样气流出时的露点在3-5℃，然后经干燥器再充分干燥，最后经切换阀及膜式精密过滤器（可视）过滤，由流量计调节和监控样气流量单元（正常流量400~600mL/min），进入分析仪器进行分析。冷凝器的冷凝液通过自动疏水阀或手动方式由集中排污管排出柜外，排污管的接口为G1/2外螺纹。切换阀可实现采样、校正的气路切换操作。采样时间到时，自动对探头进行蒸汽反吹（内、外吹扫）。
该系统的分析仪具有继电器触点输出报警或连锁控制功能，氧含量超出继电器设置上限或下限设定值时，输出的继电器就会动作切换，并且继电器是无源输出触点，可以随意选择控制：系统的触摸屏具有采样、吹扫、排水等状态信号指标的工作界面。
四、焦炉煤气中氧分析成套系统技术说明
TR-9200型煤气分析成套系统是应用于焦炉煤气气体中氧气分析的专用在线分析系统。该系统技术先进，测量准确，反应速度快，能长期连续分析被测气体，采用自动除水干燥控制，具有结构合理，运行安全可靠，自动化程度高，维护量少，保护功能强等特点。
分析仪器
TR-9200型成套系统所用分析仪器为西安聚能公司引进国外技术制造的气体分析仪，该仪器测量精确，性能可靠，性价比高。
JNYQ-O-11型氧分析仪采用进口英国CT公司原装电化学传感器，连续测量的工业固定式现场安装仪器，能连续自动检测流程气样中待测组份氧气的体积浓度含量。
仪器特点
• 独特的传感器设计，精确恒温控制，响应快，线性好，稳定性高
• 薄膜按键操作（零点、满度、线性校准、参数设置等），操作灵活方便
• 重要工作电源自诊断功能
• 仪器部件单元化，维护、检修方便
• 报警输出（上、下限极值报警）
• 标准信号隔离输出4—20mA
• 铸铝合金机箱
• 部件单元化，维护、检修方便
主要技术性能
• 零点漂移：≤±1%FS/7d
• 量程漂移：≤±1%FS/7d
• 线性误差：≤±1%FS
• 测量范围：0-5%
• 重复性误差：Cv≤±1%
• 输出波动：≤±1%FS
• 响应时间：T90≤10s
• 输出信号：4～20mA 500Ω
Key words:
Flue gas analyzer, flue gas online monitoring, VOCS online monitoring, waste incineration online monitoring
Classification:
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