Device and method for synchronously characterizing gas hydrate microscopic reaction kinetic process and macroscopic qualitative and quantitative analysis online

Abstract

The invention discloses a device and a method for synchronously characterizing the microscopic reaction kinetic process and macroscopic qualitative and quantitative properties of a gas hydrate online.The device comprises a pressure-resistant cooling table, a laser confocal Raman spectrometer for characterizing the micro reaction kinetic process of the natural gas hydrate on the pressure-resistantcooling and heating table, and a refinery gas chromatograph for characterizing the macroscopic qualitative and quantitative change of the natural gas hydrate on the pressure-resistant cooling and heating table, wherein the pressure-resistant cooling table comprises a pressure-resistant cooling and heating table body, an air inlet, an air outlet and a temperature control device, the air inlet andthe air outlet are formed in two sides of the pressure-resistant cooling and heating table body, and the temperature control device comprises a thermostatic bath, a first buffer tank and a second buffer tank. The device disclosed by the invention not only can characterize the microcosmic reaction kinetics of the hydrate in an omnibearing online manner, but also can synchronously quantify the quantity of the gas hydrate and observe the quantity change condition of the gas hydrate online. The method not only provides microcosmic information of the hydrate, but also provides the macroscopic information of the hydrate, so the hydrate can be comprehensively detected.

Description

Technical field: [0001] The invention belongs to the technical field of gas hydrate microscopic kinetics and macroscopic qualitative and quantitative characterization, and in particular relates to a device and method for synchronously on-line characterization of gas hydrate microscopic reaction kinetics process and macroscopic qualitative and quantitative. Background technique: [0002] Natural gas hydrate is a non-stoichiometric cage-like crystal substance formed by water and small molecular gases such as methane. It is widely distributed in the sediment layer of shallow sea continental shelf and plateau permafrost. Since the amount of carbon stored in gas hydrates is twice that of other carbon sources, the extraction of potential hydrocarbons from gas hydrates has attracted increasing attention. Therefore, it is also regarded as an important clean energy in the future. [0003] Since hydrates need to be stored in a low temperature and high pressure environment, the chara...

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Problems solved by technology

However, their device also has shortcomings: 1) the visible window of the reactor uses resin glass, and the resin structure affects the focus of the laser on the hydrate, and its Raman signal will cover the structural signal of the hydrate; 2) quartz glass is also used as a possible The window, whose thickness is too thick, can bear limited pressure, which greatly filters out the laser intensity and weakens the Raman spectrum signal of the hydrate; 3) The laser is exported from the Raman spectrometer through the light guide mirror, the optical path is lengthened, and the laser intensity is weakened And the laser can only move up and down to find the accumulation point, but cannot move left and right to find the accumulation point, and cannot microscopically detect all the hydrates in the reactor

[0004] At present, the characterization method for quantitative hydrate is GC. Researchers connect an air bag to the back of the reactor, wait for the air bag to be full, and then take the air bag to GC for quantification. In this way, online quantitative hydrate cannot be carried out, and Reusing the air bag will cause the loss of gas volume

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