Seawater gas detection device and detection method

Abstract

The invention discloses a seawater gas detection device and a detection method. The seawater gas detection device comprises a water sample collection unit, a gas-liquid separation unit and a gas detection unit; the water sample collection unit is used for introducing a water sample to be detected and pre-treating the water sample to be detected; the gas-liquid separation unit adopts the characteristic that the dissolving degree of the gas in the liquid is decreased along with the increasing of temperature and decreasing of pressure and separates the gas and liquid of the water sample to be detected in three levels by designing a water heater, a throttling device and a centrifugal gas-liquid separator, so that the gas-liquid separation degree is increased, the gas dissolved in the liquid water sample is more thoroughly separated, and the separation efficiency is higher; moreover, the water sample is high in flowing speed, and the precision of the gas detection unit for measuring the gas to be detected is greatly supported. In addition, a pressure-resisting shell is arranged outside the device, so that the device has the capacity for resisting the high pressure in deep sea and is convenient for executing the long-term, continuous and in-situ measurement task in a deep sea environment.

Description

technical field [0001] The invention belongs to the technical field of gas detection, and in particular relates to a device and method for in-situ detection of gas dissolved in a water body to be measured in a deep sea environment. Background technique [0002] In the marine environment, especially the offshore shelf seabed, oil and gas seepage is a widely distributed natural phenomenon. Submarine seepage is a process in which shallow biogenic gas or deep pyrolytic gas overflows the seabed under the action of buoyancy along channels such as pores, fault planes, and mud volcanoes in sediment layers. The existence of seabed oil and gas seepage indicates that there may be abundant oil and gas resources in seabed sediments. Therefore, the detection of oil and gas seepage on the seabed is helpful to economically, quickly and effectively circle oil and gas prospects. [0003] Dissolved methane and other hydrocarbons in seabed water are important indicators of deep-sea oil and ga...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of inaccurate measurement results caused by the low degree of gas-liquid separation of existing gas detection devices, the present invention proposes a seawater gas detection device that helps to improve measurement accuracy. By adopting three-stage gas-liquid separation technology, it can Fully separate the gas dissolved in the seawater to be measured

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