Experimental device for testing diffusion coefficient and osmotic coefficient of unsaturated dielectric gas

Abstract

The invention discloses an experimental device for testing a diffusion coefficient and an osmotic coefficient of an unsaturated dielectric gas. The device mainly comprises a gas-supplying device, a main body reaction device and an outlet gas processing device. The gas-supplying device comprises a water-bath heating device for heating transmitted gas, simulating the temperature generated by landfill refuse degradation and temperature variation generated by the external temperature change; the main body reaction device is composed of three parts of a lower chamber, a middle chamber and an upperchamber, which are used for simulating refuse landfill gas, landfill covering soil (or GCL) and soil sample upper environment. The upper part is loaded to a porous stainless steel plate through an aircylinder to apply pressure to a soil sample (or GCL), so as to simulate the soil pressure at the upper part of the landfill covering soil (or GCL). The outlet gas collecting device is mainly composedof a gas collecting bottle, can be used for collecting and treating the gas after reaction, and the situation that the gas after experiment pollutes the air is avoided. The device is simple in structure and wide in application range.

Description

technical field [0001] The invention relates to an experimental device for testing the gas diffusion coefficient and permeability coefficient of an unsaturated medium, which can simulate the actual situation of the landfill under constant temperature conditions and measure the relevant parameters of the unsaturated porous medium. Background technique [0002] During the landfill treatment of municipal solid waste, the landfill gas represented by methane acts as a greenhouse gas and has a serious impact on the natural environment. The landfill cover system includes gas drainage layer, geomembrane, GCL (bentonite waterproof blanket), drainage layer, and vegetation topsoil layer, which play an important role in the process of landfill gas emission reduction. Therefore, the requirements for gas diffusion and permeability of cladding materials are also increasing, and the real-time measurement of related parameters is one of the links that cannot be ignored in scientific research...

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Problems solved by technology

The disadvantages of this method are (1) the temperature of the measured gas cannot be controlled and kept constant, so that the experimental results are affected by the temperature difference; (2) the measured soil samples are only artificially compacted and buried, and the landfill cover system includes the above Covering soil and GCL and other geosynthetic materials, there is a certain error with the actual

(3) It is not convenient to change the soil sample properties when measuring the corresponding coefficients in the traditional soil column experiment, and it is difficult to adapt the experiment

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