SU1111056A1 - Device for sampling water-soluble natural gases - Google Patents

Abstract

A device for sampling water-soluble natural gases, containing water collection and sampling tanks, connected by a flexible tube and an adapter, characterized in that, in order to increase the representativeness of the sample and ensure its long-term storage, the collection tube is made in the form of an evacuated cylindrical vessel with narrower end fittings and narrowed ends, and narrowed ends, and narrower fittings, to ensure its long-term storage. evacuated with expansion in the middle part and a pointed lower end communicated with a flexible tube, and the water collection container is made in the form of a vessel with .noy become coaxially therein, a tube, the lower end of the tube does not reach the bottom of the vessel. (ABOUT

Description

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The invention relates to gas sampling devices and can be used in geological and geochemical studies to determine the chemical and isotopic composition of gases contained in natural waters. A device for sampling of natural gas Bllx is known, which includes a cutter made with channels connected to air ducts, prefabricated rods and a cuff mounted on cutter l. The disadvantage of the device is the low reliability of the samples. The closest to the proposed technical essence and the achieved result is a device for sampling water-soluble 1X natural gases, containing water collection and sampling tanks connected by a flexible tube and an adapter 2 The drawbacks of the device are low representativeness of the sample due to its pollution with atmospheric air and ingress water in the collection container and the inability to ensure long-term storage of the sample without losing its quality. Atmospheric pollution with air cannot be avoided due to air sorption on the surface of a large number of connecting tubes and a rubber chamber in contact with the sampled water sample. Rinsing with selected water without access of air to the elements of the device is not possible. The sorbed air introduces a significant error in the determination of the chemical and isotopic composition of the aqueous natural gases. The presence of water in the sampling tank requires further separation of this water before analyzing the gas sample, during which additional contaminations of the gas sample with atmospheric air are inevitable. In addition, using the known device is very difficult and time-consuming to take samples. The purpose of the invention is to increase the representativeness of the sample and ensure its long-term storage. The goal is achieved by the fact that in a device for sampling water-soluble natural gases, including water collection and sampling tanks, connected by a flexible tube and an adapter, the sampling tank is made in the form of a vacuumized cylindrical vessel with tapering ends, the adapter is made evacuated with expansion in the middle part and with a pointed lower end connected by a flexible tube, the ratio of the adapter diameters and the expansion diameter in the middle part being at least 1: 3, and The container is made in the form of a vessel with a tube installed coaxially in it, while the lower end of the tube is located at a distance relative to the bottom of the vessel. Performing a water collection container in the form of a vessel with a tube installed in it coaxially with a lower end located at a distance relative to the bottom of the vessel makes it possible to eliminate contamination of the sample of gas with atmospheric air and other gases by repeated flushing with a continuous stream of selected water adsorbed on the walls of the drainage tank and flexible tube. The execution of the sampling tank in the form of a vacuumized cylindrical vessel with tapering ends avoids contamination of the sample with air sorbed on the walls of the sampling tank. Performing an adapter evacuated with expansion in the middle part prevents water from entering the sampling tank. The drawing shows a device for sampling water-soluble natural gases. A device for sampling water-soluble natural gases includes a sump tank 1 with an inlet tube 2. and a tap 3, a sampling tank 4, made in the form of an evacuated cylindrical vessel with tapering ends, an evacuated adapter 5 with an expansion of 6 in its middle part and with a pointed lower end 7 and flexible tube 8. The device operates as follows. Water from the water source is passed with the faucet 3 open through the inlet tube 2 into the water collection tank 1 and the flexible tube 8 with the end lifted until the air bubbles are completely removed from all elements of the system for the time required for 5-10 times of water in the water collection tank. 1. Then, the pointed end 7 of the adapter 5 is tightly inserted into the upper end of the flexible tube 8 and connected to a sampling tank 4, made in the form of a cylindrical vessel with tapering ends and previously evacuated together with the adapter And water flow is stopped. Thereafter, the valve 3 is closed, the compartment of the degassed volume of water in the water collecting tank 1 from the water source is closed, and the pointed end of the adapter is broken off. In this case, vacuum degassing of water occurs: water enters the adapter and rises into expansion, where the water flow rate decreases sharply and intensive degassing of water occurs, which prevents further rise of water into the upper part of the adapter, water entering the restriction between the adapter to the sampling tank and sampling tank itself. Surrounding gas is collected in sampling tank A. The ratio of the diameters of the adapter J) of its expansion must be at least 1: 3. : When the ratio of diameters of 1: 1, water almost always fell into constriction at a ratio of 2: 1, water fell in two cases out of seven, and at a ratio of 3: 1, water did not enter constriction. After the end of the gas evolution from the water (cessation of the formation of gas bubbles), the sampling tank 4 is sealed in the place of its connection with the adapter 5 and the sealed form is stored indefinitely until the moment when its contents are used for research. The use of the device reduces the time for sampling gas samples as compared with the V.P. Savchenko, since during sampling it is not necessary to pump out the water collection vessel and the rubber chamber, and then inflate the chamber with air. The ampoules are pumped out simultaneously in a large batch of several tens of pieces. This reduces the time spent on pumping by the appropriate number of times. There is no need to carry out heavy and bulky vacuum equipment at the sampling site. Instead of sampling vessels filled with gas and partially with water (usually boutiques, closed with rubber stoppers), ampoules are transported tens and hundreds of times smaller in volume and weight, and it becomes possible to transport selected gas samples also in winter. Transportation in the winter of sampling vessels of the old design was impossible, as the water in the bottles freezes and destroys the bottles. The use of the proposed device for sampling water-soluble natural gases will increase the representativeness. samples as a result of elimination of contaminants with atmospheric air and exclusion of water ingress into the sampling tank, and also ensure long-term storage of the sample without losing its quality.

Claims (1)

A device for sampling water-soluble natural gases, containing a sampling and sampling tank connected by a flexible tube and an adapter, characterized in that, in order to increase the representativeness of the sample and ensure long-term storage of it, the sampling tank is made in the form of a vacuum cylindrical vessel with tapering ends, the adapter is made evacuated with expansion in the middle part and a pointed lower end communicated with a flexible tube, and the water collection tank * * is made in the form of a vessel from the mouth inserted in it coaxially with a tube, while the lower end of the tube does not reach the bottom of the vessel. g