CN211453489U - 一种无盲点采样及预浓缩的在线分析仪 - Google Patents
一种无盲点采样及预浓缩的在线分析仪 Download PDFInfo
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- CN211453489U CN211453489U CN201921308464.3U CN201921308464U CN211453489U CN 211453489 U CN211453489 U CN 211453489U CN 201921308464 U CN201921308464 U CN 201921308464U CN 211453489 U CN211453489 U CN 211453489U
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- 238000005070 sampling Methods 0.000 title claims abstract description 77
- 210000003733 Optic Disk Anatomy 0.000 title claims abstract description 15
- 238000003795 desorption Methods 0.000 claims abstract description 30
- 238000004094 preconcentration Methods 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 60
- 239000012159 carrier gas Substances 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 15
- 230000002572 peristaltic Effects 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- UHOVQNZJYSORNB-UHFFFAOYSA-N benzene Chemical compound 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Abstract
本实用新型提出了一种无盲点采样及预浓缩的在线分析仪，包括第一富集模块、第二富集模块、色谱柱、多个气路通道、气路控制模块和一多通阀；气路控制模块切换多通阀的气路接口，以完成气路通道的切换，以使得气路通道同时进行吸附采样和脱附进样；第一富集模块和第二富集模块通过气路通道连通多通阀；第一富集模块和第二富集模块交替进行吸附采样和脱附进样；当第一富集模块进行吸附采样时，第二富集模块进行脱附进样；色谱柱通过用于脱附进样的气路通道与多通阀连通。本实用新型通过多通阀与两个富集模块相互配合，保证了该仪器对样品无间隔采样，解决了现有技术中采样过程存在盲点，导致分析仪无法持续采样的问题。
Description
技术领域
本实用新型属于气体分析仪技术领域，尤其涉及一种无盲点采样及预浓缩的在线分析仪。
背景技术
非甲烷总烃通常是指除甲烷以外的所有可挥发的碳氢化合物(主要是 C2-C8)。大气中的NMHC超过一定浓度，对人体健康有害处，还能产生化学烟雾，对环境和人类造成重大危害。我国《大气污染物综合排放标准》的非甲烷总烃的厂界浓度标准为5mg/m3。而苯、甲苯、二甲苯作为苯系物中代表性物质，也是工业大气污染排放监测的重要指标参数。
现有的工业检测技术中，均通过气相色谱分析仪来进行检测以上有害物质。但现有的气相色谱分析仪只具备单个富集模块，富集模块脱附进样后，从脱附进样的高温降到吸附采样的低温需要一定的时间，在这段时间中，富集模块无法进行样品吸附，即存在“盲点进样”，影响了该类分析仪的采样效率。
发明内容
本实用新型的目的在于提供一种无盲点采样及预浓缩的在线分析仪，其通过多通阀与两个富集模块相互配合，保证了该仪器对样品无间隔采样，解决了现有技术中采样过程存在盲点，导致分析仪无法持续采样的问题。为实现上述目的，本实用新型所采用的技术方案为：
一种无盲点采样及预浓缩的在线分析仪，包括第一富集模块、第二富集模块、色谱柱、多个气路通道、气路控制模块和一多通阀；
其中，所述气路控制模块切换所述多通阀的气路接口，以完成气路通道的切换，以使得气路通道同时进行吸附采样和脱附进样；
所述第一富集模块和第二富集模块通过气路通道连通所述多通阀；所述第一富集模块和第二富集模块交替进行吸附采样和脱附进样；当所述第一富集模块进行吸附采样时，所述第二富集模块进行脱附进样；
所述色谱柱通过用于脱附进样的气路通道与所述多通阀连通。
优选地，所述第一富集模块脱附进样、第二富集模块吸附采样时，样品经多通阀和气路通道进入第二富集模块，载气经多通阀和气路通道进入第一富集模块，将待检测物质带入色谱柱和检测器。
优选地，所述第一富集模块吸附采样、第二富集模块附脱附进样时，样品经多通阀进入第一富集模块，载气经多通阀进入第二富集模块，将待检测物质带入色谱柱和检测器。
优选地，其中3条所述气路通道上分别设置一样品入口、2个样品出口和一载气入口；所述样品入口连通用于吸附采样的气路通道；所述样品出口连通所述样品入口；所述载气入口连通用于脱附进样的气路通道。
优选地，进一步包括流量计；所述流量计设置在所述样品出口处的气路通道上。
优选地，所述第一富集模块和第二富集模块位于所述多通阀的两侧。
优选地，进一步包括检测器；所述检测器的进气端连接所述色谱柱的出气端。
优选地，进一步包括蠕动泵；所述蠕动泵设置在所述样品出口处气路通道上。
优选地，进一步包括阀箱；所述阀箱罩在所述多通阀上；所述阀箱位于所述第一富集模块和第二富集模块之间。
优选地，所述多通阀为一十通阀；所述多通阀为一转阀。
与现有技术相比，本实用新型的优点为：多通阀与第一富集模块、第二富集模块相互配合，当一个富集模块开始降温处于盲点时，另一个富集模块进行吸附采样，从而保证仪器对样品无间隔采样，解决了现有技术中采样过程存在盲点，导致分析仪无法持续采样的问题。
附图说明
图1为本实用新型一实施例的无盲点采样及预浓缩的在线分析仪的初始状态图；
图2为本实用新型一实施例的第一富集模块脱附进样、第二富集模块开始吸附采样的状态图；
图3为本实用新型一实施例的第一富集模块脱附进样完成开始降温、第二富集模块继续吸附采样的状态图；
图4为本实用新型一实施例的第一富集模块开始吸附采样、第二富集模块脱附进样的状态图；
图5为本实用新型一实施例的第一富集模块继续吸附采样、第二富集模块脱附进样完成开始降温的状态图。
其中，1-第一富集模块，2-第二富集模块，3-色谱柱，4-多通阀，5-检测器， 6-样品入口，7-样品出口，8-载气入口，9-阀箱，10-流量计，11-蠕动泵。
具体实施方式
下面将结合示意图对本实用新型的无盲点采样及预浓缩的在线分析仪进行更详细的描述，其中表示了本实用新型的优选实施例，应该理解本领域技术人员可以修改在此描述的本实用新型，而仍然实现本实用新型的有利效果。因此，下列描述应当被理解为对于本领域技术人员的广泛知道，而并不作为对本实用新型的限制。
如图1～5所示，一种无盲点采样及预浓缩的在线分析仪，包括第一富集模块1、第二富集模块2、色谱柱3、多个气路通道、气路控制模块和一多通阀4；其中，气路控制模块切换多通阀4的气路接口，以完成气路通道的切换，以使得气路通道同时进行吸附采样和脱附进样；第一富集模块1和第二富集模块2 通过气路通道连通多通阀4；第一富集模块1和第二富集模块2交替进行吸附采样和脱附进样；当第一富集模块1进行吸附采样时，第二富集模块2进行脱附进样；色谱柱3通过用于脱附进样的气路通道与多通阀4连通。第一富集模块1和第二富集模块2完成对待检测物质的预浓缩，第一富集模块1和、第二富集模块2和多通阀4配合实现该分析仪的无盲点采样。
具体的，第一富集模块1脱附进样、第二富集模块2吸附采样时，样品经多通阀4和气路通道进入第二富集模块2，载气经多通阀4和气路通道进入第一富集模块1，将待检测物质带入色谱柱3和检测器5。第一富集模块1吸附采样时、第二富集模块2附脱附进样时，样品经多通阀4和气路通道进入第一富集模块1，载气经多通阀4和气路通道进入第二富集模块2，将待检测物质带入色谱柱3和检测器5。
在本实施例中，吸附采样的工作13℃；待检测物质的属性不同，吸附采样的工作温度也不相同；脱附进样的工作温度为300℃。第一富集模块1和第二富集模块2均可制冷到-10℃，也可以40℃/s速度快速升温到300℃。
在本实施例中，其中3条气路通道上分别设置一样品入口6、2个样品出口7和一载气入口8；样品入口6连通用于吸附采样的气路通道；样品出口7连通样品入口6；载气入口8连通用于脱附进样的气路通道。
在本实施例中，进一步包括流量计10；流量计10设置在样品出口7处的气路通道上。流量计10可实时监测第一富集模块1和第二富集模块2内，滞留的待检测物质的体积，用于检测器5的定量检测，同时流量计10可检测排出的空气速度，使得排速保持在合理的范围内，防止样品流速过快，使得待检测物质的滞留时间短，影响第一富集模块1和第二富集模块2的吸附性能。
在本实施例中，第一富集模块1和第二富集模块2位于多通阀4的两侧，即位于多通阀4的周轴心线的两侧，便于布置气路通道。
在本实施例中，进一步包括检测器5；检测器5的进气端连接色谱柱3的出气端。
在本实施例中，进一步包括蠕动泵11；蠕动泵11设置在样品出口7处气路通道上。
在本实施例中，进一步包括阀箱9；阀箱9罩在多通阀4上；阀箱9位于第一富集模块1和第二富集模块2之间。
在本实施例中，多通阀4为一十通阀；多通阀4为一转阀。
本实用新型的工作原理为：如图1～5所示，为该无盲点采样及预浓缩的在线分析仪的无盲点采样的一个工作周期。具体的，如图1所示，第一富集模块1 准备就绪，无样品通入，此时切换十通阀切换至图2的工作状态，样品经十通阀进入第二富集模块2；载气经十通阀的两个气路接口，经第一富集模块1，将待检测物质带入色谱柱3；具体的，此时第一富集模块1的温度由13℃升温至 300℃，通入样品，第一富集模块1在载气和高温的作用下进入色谱柱3和检测器5，即第一富集模块1开始脱附进样；同时第二富集模块2在低温13℃的环境下开始吸附采样，第二富集模块2将样品中的待检测气体吸附保留，样品中的空气经样品出口7排出，该处的流量计10实时记录第二富集模块2中空气排出的速度；如图3所示，第一富集模块1脱附进样完成后开始降温并降至13℃、第二富集模块2继续吸附采样；此时第二富集模块2处的流量计10显示待测气体的体积；之后切换十通阀至图4状态，样品经十通阀进入第一富集模块1；载气经十通阀的两个气路接口，经第二富集模块2，将待检测物质带入色谱柱3；第二富集模块2开始在300℃和载气作用下进行脱附进样，同时第一富集模块1 开始吸附采样；同样，第一富集模块1处的流量计10实时记录第一富集模块1 中空气排出的速度；如图5所示，第一富集模块1继续吸附采样、第二富集模块2脱附进样完成开始降温并降至13℃。由此，图1～图5完成了一个无盲点采样的工作周期。
上述仅为本实用新型的优选实施例而已，并不对本实用新型起到任何限制作用。任何所属技术领域的技术人员，在不脱离本实用新型的技术方案的范围内，对本实用新型揭露的技术方案和技术内容做任何形式的等同替换或修改等变动，均属未脱离本实用新型的技术方案的内容，仍属于本实用新型的保护范围之内。
Claims (10)
1.一种无盲点采样及预浓缩的在线分析仪，其特征在于，包括第一富集模块、第二富集模块、色谱柱、多个气路通道、气路控制模块和一多通阀；
其中，所述气路控制模块切换所述多通阀的气路接口，以完成气路通道的切换，以使得气路通道同时进行吸附采样和脱附进样；
所述第一富集模块和第二富集模块通过气路通道连通所述多通阀；所述第一富集模块和第二富集模块交替进行吸附采样和脱附进样；当所述第一富集模块进行吸附采样时，所述第二富集模块进行脱附进样；
所述色谱柱通过用于脱附进样的气路通道与所述多通阀连通。
2.根据权利要求1所述的无盲点采样及预浓缩的在线分析仪，其特征在于，所述第一富集模块脱附进样、第二富集模块吸附采样时，样品经多通阀和气路通道进入第二富集模块，载气经多通阀和气路通道进入第一富集模块，将待检测物质带入色谱柱和检测器。
3.根据权利要求1所述的无盲点采样及预浓缩的在线分析仪，其特征在于，所述第一富集模块吸附采样、第二富集模块附脱附进样时，样品经多通阀进入第一富集模块，载气经多通阀进入第二富集模块，将待检测物质带入色谱柱和检测器。
4.根据权利要求1所述的无盲点采样及预浓缩的在线分析仪，其特征在于，其中3条所述气路通道上分别设置一样品入口、2个样品出口和一载气入口；所述样品入口连通用于吸附采样的气路通道；所述样品出口连通所述样品入口；所述载气入口连通用于脱附进样的气路通道。
5.根据权利要求4所述的无盲点采样及预浓缩的在线分析仪，其特征在于，进一步包括流量计；所述流量计设置在所述样品出口处的气路通道上。
6.根据权利要求1所述的无盲点采样及预浓缩的在线分析仪，其特征在于，所述第一富集模块和第二富集模块位于所述多通阀的两侧。
7.根据权利要求1所述的无盲点采样及预浓缩的在线分析仪，其特征在于，进一步包括检测器；所述检测器的进气端连接所述色谱柱的出气端。
8.根据权利要求4所述的无盲点采样及预浓缩的在线分析仪，其特征在于，进一步包括蠕动泵；所述蠕动泵设置在所述样品出口处气路通道上。
9.根据权利要求1所述的无盲点采样及预浓缩的在线分析仪，其特征在于，进一步包括阀箱；所述阀箱罩在所述多通阀上；所述阀箱位于所述第一富集模块和第二富集模块之间。
10.根据权利要求1所述的无盲点采样及预浓缩的在线分析仪，其特征在于，所述多通阀为一十通阀；所述多通阀为一转阀。
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