Direct determination method for mercury content in natural gas

A measurement method and technology of natural gas, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of unsuitable raw material gas and complicated detection methods, and achieve the effect of simple operation, easy mastery and high accuracy

Active Publication Date: 2012-07-25
PETROCHINA CO LTD
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Problems solved by technology

[0003] At present, the detection method of mercury content in natural gas is mainly for product gas, not only the detection method is complicated, but also not suitable for raw gas containing more water and oil, and the detection of raw gas is more important for mercury removal in gas fields

Method used

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  • Direct determination method for mercury content in natural gas
  • Direct determination method for mercury content in natural gas
  • Direct determination method for mercury content in natural gas

Examples

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Effect test

Embodiment 1

[0057] Direct Determination of Mercury Content in Raw Natural Gas for Processing Plants

[0058] (1) Place the air bag sample collected with the air nozzle upward and let it stand for at least 5 minutes;

[0059] (2) According to figure 2 Connect the parts as shown;

[0060] (3) Record the ambient temperature as 24.5°C and the ambient pressure as 97.2KPa, place the first three-way valve 4 in a position connected to the atmosphere 9, place the second three-way valve 5 in a position directly connected with the mercury detector 8 position, start the mercury detector 8, open the valve of the gas nozzle of the air bag, place the first three-way valve 4 at the position connected to the air bag 3, and record the detection value of 8569ng / m after the reading of the mercury detector 8 is stable 3 , and then place the second three-way valve 5 in a position communicating with the mercury filter 6, and record the detected value of 1231ng / m after the reading of the mercury detector 8 st...

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Abstract

The invention provides a direct determination method for the mercury content in natural gas. The determination method comprises the following steps of: (1) connecting determination devices, wherein the determination devices comprise a gasbag filled with the natural gas, a first three-way valve, a second three-way valve, a three-way pipe, a mercury filter and a mercury detector; and (2) firstly introducing the natural gas into the mercury detector and detecting to obtain a detected value C1, filtering out the mercury from the natural gas by using the mercury filter, then, feeding the filtered natural gas into the mercury detector and detecting to obtain a detected value C2, and obtaining the mercury content C in the natural gas according to an equation, i.e. C= C1-C2. The determination method provided by the invention has the advantages of high accuracy in obtained detection result, good repeatability, strong applicability, and no influence arising from oil content and moisture content, and is applicable to natural gases of various types, such as wellhead natural gas and the feed gas and product gas of a treatment plant.

Description

technical field [0001] The invention belongs to the fields of natural gas geochemistry and natural gas surface engineering, and in particular relates to a method for directly measuring mercury content in natural gas. Background technique [0002] Mercury is a common harmful heavy metal element in natural gas, and the mercury content of different types of natural gas often varies greatly. For gas field production, high-mercury natural gas is not only highly corrosive to production equipment, causing catastrophic accidents such as gas leakage, shutdown or even explosion, but may also cause great harm to operators. Therefore, it is necessary to remove mercury from natural gas with high mercury content, and the detection results of mercury content in natural gas are the most basic data for mercury removal in gas fields. [0003] At present, the method for detecting mercury content in natural gas is mainly for product gas. Not only is the detection method complicated, but it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 韩中喜严启团李剑王淑英葛守国王春怡张庆男侯栋才王旭东
Owner PETROCHINA CO LTD
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