A method and calorimeter for measuring the heat release rate of materials in a reactor

Abstract

The invention discloses a technique for measuring the heat release rate of materials in a reactor. The thermal compensation method is used to measure the heat release rate of the material based on the equivalent heat equivalent principle of temperature difference. The calorimeter designed by this technology is mainly composed of two measurement bridges and a comparison bridge with the same shape and material. The sample material is fixed on the measurement bridge, and controllable electric power is input on the comparison bridge to make the temperature difference between the measurement points on the comparison bridge The temperature difference between the measuring points corresponding to the measuring bridge is equal, and the input controllable electric power divided by the sample mass is the heat release rate of the sample to be tested. In order to allow the calorimeter to be placed in a static coolant and to increase its safety, the calorimeter has a cold junction with enhanced heat transfer capability. In order to weaken the influence of gas heat conduction and radiation heat transfer on the measurement results, the calorimeter adopts a double cladding design with a gap between the two claddings. This technology effectively overcomes the influence of material properties on the measurement results due to changes in environmental parameters and reduces the impact on The correction of the experimental results realizes the direct measurement of the heat release rate of the material.

Description

technical field [0001] The invention relates to a reactor material irradiation device and belongs to the technical field of reactor material irradiation. Background technique [0002] In reactors, with the increase of structural materials in the reactor and the increase in the proportion of structural materials in some irradiation devices, the heat release of structural materials has become one of the important sources of heat in the reactor. On the one hand, the heat release of the material source in the reactor comes from the energy deposition in the material generated by the neutron transport process; During transportation in the pile, it will also interact with materials and release heat. Determining the heat release rate of structural materials is of great significance to ensure the safe operation of reactors and conduct irradiation experiments in research reactors. [0003] The increase of structural materials in the reactor will lead to an increase in the heat relea...

AI Technical Summary

Problems solved by technology

However, in the existing measurement technology, the heat release rate of the material is mostly converted from other measurement parameters, and complex calculation methods are required to compensate for the heat dissipation of the sample during the measurement process. Therefore, the accuracy of the experimental measurement results is relatively low. Poor, and greatly affected by the experimental environment

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