Device and method for measuring heat conductivity coefficient of buffer/backfill material

A technology of thermal conductivity and measuring device, which is used in the field of thermal conductivity testing of buffer/backfill materials for geological disposal of high-level radioactive waste, and achieves the effects of high precision, convenient measurement and convenient operation.

Active Publication Date: 2018-10-23
BEIJING RES INST OF URANIUM GEOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] Over the past few decades, a large number of thermal conductivity testing methods and systems have been developed

Method used

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  • Device and method for measuring heat conductivity coefficient of buffer/backfill material

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Experimental program
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Embodiment

[0045] Step 1. Sample preparation

[0046] (1.1) Weigh the mass of bentonite and additives according to a certain ratio (9:1), prepare test samples with different water content (10%) by spray method, and keep them sealed for at least 48 hours to ensure their uniformity;

[0047] (1.2) According to the predetermined dry density (1.7g / cm 3 ) And volume (Φ30mm×10mm), calculate and weigh the corresponding mass of bentonite and additives;

[0048] (1.3) Load the weighed bentonite and additives into the pressing mold, start the press for sample pressing, record the mass and volume of the test sample after demolding, and quickly put it into a sealed bag for later use;

[0049] Step 2. Sample installation

[0050] (2.1) Clamp the test probe 6 between the two test samples 5, put it into the sample holder 3, and tighten the screw 4 to make the test sample 5 and the test probe 6 closely contact;

[0051] (2.2) Put the sample rack 3 with the sample installed into the test box 2, pour the liquid 10, ...

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Abstract

The invention specifically relates to a device and method for measuring the heat conductivity coefficient of a buffer/backfill material, belonging to the field of testing of the thermal conductivity of buffer/backfill materials applied to geological disposal of high-level waste. The objective of the invention is to provide the measuring device and method capable of acquiring the thermal conductivity of the buffer/backfill material, controlling effective transmission of decay heat produced in a high-level waste tank and providing bases for engineering design of deep geological disposal repositories of high-level waste so as to overcome disadvantages in the prior art. The device comprises a gas loading device (1), a testing box (2), a sample holder (3), a screw (4), a sample (5), a test probe (6), a heater (7), a temperature sensor (8), a gas monitoring probe (9), a liquid (10), a valve A (11), a valve B (12) and a valve C (13).

Description

Technical field [0001] The invention belongs to the field of thermal conductivity testing of buffer / backfill materials for geological disposal of high-level radioactive waste, and specifically relates to a thermal conductivity measurement device and method for buffer / backfill materials. Background technique [0002] The heat release of high-level radioactive waste in the deep geological repository of high-level radioactive waste will cause an increase in temperature in the waste body, packaging containers, buffer materials and surrounding rocks, resulting in stress changes and material minerals in the buffer / backfill materials and surrounding rocks in the repository Changes in composition and performance. As a conductor of high-level waste decay heat transfer to the surrounding rock of the repository, the thermal conductivity of the buffer / backfill material (bentonite and its additives) affects the formation of the temperature field and the distribution of thermal stress, which i...

Claims

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Application Information

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IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 刘月妙谢敬礼曹胜飞高玉峰
Owner BEIJING RES INST OF URANIUM GEOLOGY
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