A method for evaluating the thermal insulation performance of an accelerating calorimeter based on the Joule heating effect

Abstract

The invention discloses a method for evaluating the thermal insulation performance of an accelerated calorimeter based on the Joule heat effect. The invention takes an accelerated calorimeter as an evaluation object, including a standard heating rod, an externally inserted sample container, a sample thermocouple, a microcontroller, a temperature and power measurement module, data acquisition software, and the like. The core of the present invention is based on the Arrhenius reaction rate equation, and generates heat through the Joule heating effect of the pure resistance in the heating rod, simulating the heat release of the sample reaction; through the accelerated calorimetry test experiment, the measured sample power and temperature rise rate are obtained , on the premise that the specific heat capacity of the sample is known, calculate the ratio of the real-time power to the product of the temperature rate and the specific heat capacity, which is the adiabatic performance factor of the accelerating calorimeter to realize the evaluation of the adiabatic performance. The thermal insulation performance evaluated by the present invention is a quantity that changes with temperature, time and reaction process, which is more in line with the experimental facts than the traditional definition of thermal inertia.

Description

technical field [0001] The invention relates to the field of accelerated calorimetry technology and instruments for chemical process safety, in particular to an evaluation method for the thermal insulation performance of an accelerated calorimeter based on the Joule heating effect. Background technique [0002] In the chemical industry, the safety of chemical production is an important issue that cannot be ignored, especially due to the lack of awareness of the thermal hazards of chemical substances, the thermal runaway of the chemical process leads to unimaginable results. Accelerating calorimeter maintains heat insulation by keeping the temperature of the sample consistent with the environment, and realizes the calculation of reaction thermodynamics through the thermal behavior test of the sample in the adiabatic state. It is one of the ideal tools for the analysis of the causes of thermal safety accidents. [0003] Due to the problem of the thermal inertia of the accelera...

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Problems solved by technology

This description ignores the fact that the specific heat of the sample cell and the sample changes with temperature, and it also lacks consideration of the heat loss of the sample due to the poor tracking effect of the furnace body on the sample temperature in the accelerated calorimetry experiment.

[0004] The evaluation of the performance of the accelerated calorimeter by the thermal inertia only reflects the relationship between the specific heat capacity, volume and withstand pressure of the sample cell, but cannot realize the verification and evaluation of the overall thermal insulation performance of the accelerated calorimeter

Due to the lack of relevant standards and methods, users at home and abroad are unable to effectively evaluate and verify the core index of accelerated calorimetry - adiabatic performance, and cannot test and compare the performance indicators of accelerated calorimeters produced by various manufacturers, resulting in Users suffer losses

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