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Device and method for detecting content of liquid hydrocarbon in natural gas

A detection device and liquid hydrocarbon technology, which is applied in the direction of measuring devices, fuel oil testing, material inspection products, etc., can solve problems such as inconsistency with the real situation, difficulty in guiding actual production, rough methods, etc.

Active Publication Date: 2022-05-27
PETROCHINA CO LTD
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Problems solved by technology

[0007] Chinese patent CN 103076404 discloses a method for detecting total liquid hydrocarbons in natural gas, which uses natural gas composition analysis to deduct C from 100% 1 -C 4 The weighted content method can obtain the composition content of liquid hydrocarbons in natural gas, and the analysis is fast. However, this method is relatively rough, and the calculated value does not change with pressure and temperature, which is inconsistent with the real situation, and it is often difficult to guide the actual production.
[0008] In addition, the analysis results of natural gas composition are generally used as input values ​​in the industry, and the state equation is used to predict the liquid hydrocarbon content in natural gas, thereby guiding the design and operation of natural gas processing equipment. There is still a large deviation in the value, and the applicability is not strong in some occasions where the content of liquid hydrocarbons needs to be precisely controlled

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  • Device and method for detecting content of liquid hydrocarbon in natural gas
  • Device and method for detecting content of liquid hydrocarbon in natural gas
  • Device and method for detecting content of liquid hydrocarbon in natural gas

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Embodiment 1

[0068] The present embodiment provides a detection device for the content of liquid hydrocarbons in natural gas, the schematic diagram of which is as follows: figure 1 shown, from figure 1 It can be seen that the device includes:

[0069] The sampling pipe 25, the heat exchanger 7, the gas-liquid separator 8, the liquid hydrocarbon content detection part, the gas flow detection part, the differential pressure test part and the connecting pipeline.

[0070] The sample introduction tube 25 communicates with one end of the heat exchanger 7 , and the other end of the heat exchanger 7 communicates with the input end of the gas-liquid separator 8 . The input end of the liquid hydrocarbon content detection component communicates with the liquid outlet end of the gas-liquid separator 8 . The input end of the gas flow detection part is communicated with the gas outlet end of the gas-liquid separator 8; the differential pressure test part is connected to the liquid hydrocarbon content...

Embodiment 2

[0092] The present embodiment provides a method for detecting the content of liquid hydrocarbons in natural gas, wherein the method is realized by using the detection device for the content of liquid hydrocarbons in natural gas provided in Embodiment 1, and the method includes the following specific steps:

[0093] S1. Take the calibration liquid n-undecane, fill it into the second measuring tube 11-2 with a diameter of 20 mm, measure the differential pressure of the calibration liquid at both ends of the measuring tube by the sensitive differential pressure gauge 24, and obtain the differential pressure signal, The mass and differential pressure signal data of n-undecane charged into the measuring tube and the connecting pipeline are shown in Table 1 below. According to the experimental data in Table 1, the least squares method is used to obtain the difference between the differential pressure signal and the mass of the calibration liquid. function relationship, the calibratio...

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Abstract

The invention provides a device and a method for detecting the content of liquid hydrocarbon in natural gas. The device comprises a sample injection pipe, the sample feeding pipe is communicated with one end of the heat exchanger; the other end of the heat exchanger is communicated with the input end of the gas-liquid separator; the input end of the liquid hydrocarbon content detection component is communicated with the liquid outlet end of the gas-liquid separator; the input end of the gas flow detection component is communicated with the gas outlet end of the gas-liquid separator; the differential pressure testing component is connected to the liquid hydrocarbon content detection component, and the differential pressure value of liquid in the liquid hydrocarbon content detection component is tested through the differential pressure testing component. The device and the method for detecting the content of the liquid hydrocarbon in the natural gas, provided by the invention, can simply, efficiently and accurately detect the content of the liquid hydrocarbon in the natural gas.

Description

technical field [0001] The invention relates to a detection device and method for the content of liquid hydrocarbons in natural gas, and belongs to the technical field of natural gas detection. Background technique [0002] In recent years, my country's natural gas industry has developed rapidly. In 2018, my country's natural gas consumption reached 281 billion m3 3 , the production volume is 161 billion m 3 , the import volume is 120 billion m 3 . [0003] The main component of natural gas is methane, and also contains a small amount of ethane, propane, butane, pentane and hexane (C 6 + ) hydrocarbon gases, additionally containing CO 2 , N 2 , H 2 S.O 2 , H 2 And trace inert gases (such as He, Ar) and other non-hydrocarbon gases. When the heavy hydrocarbon components in natural gas are high, it is generally called condensed natural gas. The mixture in natural gas will condense out liquid during the isothermal decompression process. All of them brought great chall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/22
CPCG01N33/225Y02T10/30
Inventor 张镨周理曾文平熊钢蒲长胜
Owner PETROCHINA CO LTD
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