Method and device for analyzing Xe isotope in methane-enriched natural gas
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An analysis method and technology of natural gas, which are applied in measurement devices, analysis materials, material analysis by electromagnetic means, etc., can solve the problems of inaccurate detection and low Xe, etc.
Inactive Publication Date: 2017-09-15
NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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[0007] In order to solve the technical problem in the prior art that cannot be accurately detected due to the extremely low content of Xe, the present invention provides a simple isotope analysis method. Before the analysis, simple enrichment and purification are carried out, and then rare gas is used to The mass spectrometer can obtain the isotopic information of Xe, for example 129 Xe, 131 Xe, 132 Xe et al., this method has high accuracy, simple operation and low cost, which is of great significance to the study of geological objects and geological history
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Embodiment 1
[0089] The isotope analysis method of embodiment 1 Xe
[0090] 1. Enrichment treatment
[0091] 1.1 Negative pressure extraction of external natural gas
[0092] Vacuum the vacuum line to make its negative pressure reach 10 -5 Pa, open the device for storing natural gas, so that the external natural gas is extracted.
[0093] 1.2 Water removal treatment
[0094] Under vacuum conditions, the extracted natural gas is in a low-temperature environment controlled by liquid nitrogen-alcohol, CO 2 and H 2 O condenses, thereby converting CO 2 and H 2 O is collected to obtain a dehydrated natural gas sample.
[0095] 1.3 Cryogenic collection
[0096] At the temperature of liquid nitrogen, Kr and Xe in the natural gas sample from which moisture has been removed are collected, and a sample to be tested with Kr and Xe as main components is obtained.
[0097] 1.4 Handling of other ingredients
[0098] Vacuum the vacuum pipe again to make the negative pressure reach 10 -5 Pa, oth...
Embodiment 2
[0106] Example 2 Xe isotope analysis device in natural gas
[0107] Such as figure 1 The shown Xe isotope analysis device in natural gas provided by the present invention includes an external natural gas storage device 1, negative pressure device 2, water absorption device 3, collection device 4, reaction adsorption device 5, filter device 6, super negative pressure device 7, separation equipment 8, and isotope analysis equipment 9.
[0108] Wherein, the above-mentioned devices are all connected by vacuum pipelines.
[0109] Further, the negative pressure device 2, the water absorption device 3, the collection device 4, the reaction adsorption device 5, the filter device 6, the separation device 8, and the isotope analysis device 9 are all provided with valves at the connection of the vacuum pipeline, respectively Vf , V3, V4, V7, V8, V11, V12.
[0110]Further, the vacuum pipeline is provided with a plurality of valves, which are the valve V0 arranged between the external n...
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Abstract
The invention discloses a method and device for analyzing Xe isotope in methane-enriched natural gas, and relates to the technology of noble gas isotope analysis. The method comprises the following steps of Xe-enriching treatment by negative pressure extraction, moisture removal and low-temperature collection on external natural gas to obtain a to-be-detected sample which has the Xe content enough for detecting the Xe isotope information and takes Kr and Xe as main components from the external natural gas; purification treatment for the to-be-detected sample taking Kr and Xe as main components to obtain an analyzing sample which only contains Kr and Xe components; and separation treatment for the analyzing sample which only contains Kr and Xe to obtain an analyzing sample only containing Xe, and isotope analysis on the analyzing sample only containing Xe to obtain the isotope information of Xe in the natural gas sample. The method can be used for directly obtaining the Xe isotope content, has few influence factors in the analyzing process, and has the advantages of accurate result, high efficiency, simple operation and wide universality.
Description
technical field [0001] The invention relates to shale residual gas analysis technology, in particular to a rare gas online analysis method and system technical background [0002] Noble gases have become important tracers of geological objects and geological history because of their inactive chemical properties, low abundance in nature, and their origins are related to specific nuclear processes. The degassing and formation of the atmosphere, as well as isotopic age determination, are of great significance. [0003] Atmospheric xenon also has a strong, global fractionation effect. The 129Xe excess represents the decay product of the early-formed, now-extinct radionuclide 129I. If there is an excess of 129Xe in natural gas, it means that there is an addition of earth's original components. [0004] However, the isotopic structure of xenon on Earth is particularly complex. Especially the Xe isotope content in natural gas is extremely low (10 - 5 ppm), there are many impu...
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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N1/28G01N1/34G01N1/44
CPCG01N1/28G01N1/34G01N1/44G01N27/62
Inventor 曹春辉杜丽贺坚李立武
Owner NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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