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Test device for simulating diffusion and migration of in-situ pyrolysis pollutants in underground water

A technology of in-situ pyrolysis and test equipment, applied in measuring equipment, liquid dispersion analysis, instruments, etc., can solve problems such as heavy metals, organic pollutants entering, large phase difference, groundwater pollution, etc.

Inactive Publication Date: 2017-08-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although in-situ pyrolysis mining has the above advantages, pyrolysis will cause a huge change in the permeability of oil shale and low-metamorphic coal, from a water-resistant layer to a water-permeable layer, heavy metals, organic pollutants, etc. produced during the pyrolysis process can enter adjacent aquifers and cause groundwater contamination
At present, there are few studies on groundwater pollution by in-situ pyrolysis, and they are mainly based on stagnant water immersion tests. This is seriously inconsistent with the in-situ stress and water pressure conditions in the mining area, and the test results are quite different from the real situation.

Method used

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  • Test device for simulating diffusion and migration of in-situ pyrolysis pollutants in underground water

Examples

Experimental program
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Effect test

Embodiment approach 1

[0021] Implementation mode 1: Simulate the diffusion and migration of oil shale in-situ pyrolysis pollutants in groundwater

[0022] The test device in this embodiment adopts the above-mentioned test device for simulating the diffusion and migration of in-situ pyrolyzed pollutants in groundwater.

[0023] The specific implementation steps are as follows:

[0024] 1. Put the pyrolysis oil shale test piece and the water-permeable rock formation test piece with a size of Φ400×50mm into the pyrolysis rock formation support platform 12 and the adjacent water-permeable formation support platform 14 respectively, and use fastening bolts 17 to load the pyrolysis formation rock formation. The platform 12 is sealed, and the adjacent permeable rock formation platform 14 is sealed.

[0025] 2. The first water replenishment valve 7-1 is opened, the second water replenishment valve 7-2 is opened, the third water replenishment valve 7-3 is opened, and the water inlet valve 8 is opened, so t...

Embodiment approach 2

[0031] Implementation mode 2: Simulating the diffusion and migration of lignite in situ pyrolysis pollutants in groundwater

[0032] The test device of this embodiment adopts the above-mentioned test device for simulating the diffusion and migration of in-situ pyrolysis pollutants in groundwater, which can meet the requirements of simulating the diffusion and migration of lignite in-situ pyrolysis pollutants in groundwater. and the permeable rock formation test piece are placed in the carrier, sealed, and the equipment is filled with water. After the temperature of the thermostat reaches the set value and stabilizes for 30 minutes, apply axial pressure, confining pressure and water pressure to the test piece, and open the bottom drain valve 15. Make it flow at the same speed as the groundwater flow. After that, the drain valve on the right side was opened regularly to collect the polluted liquid at different locations, the composition and concentration of the polluted liquid w...

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Abstract

The invention relates to a test device for simulating diffusion and migration of in-situ pyrolysis pollutants in underground water, and belongs to the technical field of pyrolysis reaction pollutant diffusion and migration. The test device comprises a hydraulic pressure simulation system, a ground temperature and ground stress simulation system and a pollutant diffusion and migration simulation system, wherein the hydraulic pressure simulation system consists of gas, a gas pressure boosting pump, a pressure regulating valve, a pressure gauge, a gas inlet valve, a water box, a water supplementing valve and a water inlet valve; the ground temperature and ground stress simulation system consists of a constant temperature box, a servo pressure machine and a pressure sensor; the pollutant diffusion and migration simulation system comprises a water box, a pyrolysis rock layer carrying table, a penetrating fluid box, an adjacent permeable layer carrying table, a liquid discharging valve, a liquid collector and a water supplementing valve. The test device overcomes the defects that the existing test device is in a nonrestraint state, test pieces are not loaded; the ground temperature environment and the underground water flowing state are not emphasized. The feasibility test study on diffusion and migration of in-situ pyrolysis pollutants such as oil shale and low metamorphic coal in underground water being hundreds of meters away from the ground can be performed.

Description

technical field [0001] The invention is a test device for simulating the diffusion and migration of in-situ pyrolysis pollutants in groundwater, which is mainly used for simulation research on groundwater pollution in in-situ pyrolysis mining areas such as oil shale and low-metamorphic coal. The law of diffusion and migration in groundwater provides experimental data. Background technique [0002] In-situ pyrolysis mining is to directly inject pyrolysis fluid into the underground target ore layer through the heat injection well, and use the physical and chemical interaction between the injected fluid and the useful components of the ore layer to pyrolyze the useful components of the target ore layer in situ, and finally A mining method that converts useful components into fluids that are then extracted to the surface through production wells. Compared with traditional mining methods, resources can be obtained without mining minerals to the surface. It has the advantages of ...

Claims

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Application Information

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IPC IPC(8): G01N13/04
CPCG01N13/04G01N2015/0034
Inventor 刘剑梁卫国李子文高亚斌廉浩杰黎力耿毅德
Owner TAIYUAN UNIV OF TECH
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