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

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...

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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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