Device and method combining TDLAS with photoacoustic spectrometry to measure natural gas heat value

Abstract

The invention discloses a device and a method combining TDLAS with photoacoustic spectrometry to measure natural gas heat value and relates to the technical field of optical measuring devices. The device comprises a pipeline and a detection box, a first pushing box is communicated on each of two sides of the detection box, a partition is fixedly connected inside the detection box, an elastic filmis fixedly connected between the top of the partition and the top of an inner cavity of the detection box, and a laser transmitter is fixedly connected at the top of the partition and positioned inside the elastic film. A small independent space can be separated out by arranging the elastic film, and the top of the elastic film can be sealed by utilizing cooperation between a first electric extensible rod and a clamping plate; after being separated from a big natural gas pipeline, even if fire is caused by electricity leakage, natural gas in the big pipeline is unaffected; by utilizing cooperation between the laser transmitter and the laser receiver, the heat value of the natural gas can be detected conveniently and precisely, and the device and the method are safe, precise and efficient.

Description

technical field [0001] The invention relates to the technical field of optical measurement devices, in particular to a device and method for measuring the calorific value of natural gas by combining TDLAS and photoacoustic spectroscopy. Background technique [0002] Natural gas refers to all gases that exist naturally in nature, including gases formed by various natural processes in the atmosphere, hydrosphere, and lithosphere (including oil field gas, gas field gas, mud volcano gas, coal bed methane, and biologically generated gas, etc.). The definition of "natural gas" that people have used for a long time is a narrow definition from the perspective of energy, which refers to the mixture of hydrocarbon and non-hydrocarbon gases naturally stored in the formation. In petroleum geology, it usually refers to oil field gas and gas field gas. Its composition is dominated by hydrocarbons and contains non-hydrocarbon gases. Natural gas is stored in underground porous rock format...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a device and method for measuring the calorific value of natural gas in combination with TDLAS and photoacoustic spectroscopy, which solves the problem of directly using electronic components in the pipeline to detect that natural gas may be burned due to excessive current. Causes danger, and indirect detection through a thin film or through a heat conductor will affect the accuracy of the problem

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