Accelerating rate calorimeter heat insulation performance evaluation method based on Joule heating effect

Abstract

The invention discloses an accelerating rate calorimeter heat insulation performance evaluation method based on a Joule heating effect. An accelerating rate calorimeter is taken as an evaluation object, and a standard heating rod, an external insertion type sample container, a sample thermocouple, a microcontroller, a temperature and power measurement module, data acquisition software and the likeare included. The method is characterized in that on the basis an Arrhenius reaction rate equation, heat is produced through the Joule heating effect of a pure resistor in the heating rod to simulateheat release through a sample reaction; actual sample power and temperature rising rate are obtained through accelerating rate calorimeter test experiments, the ratio, namely an accelerating rate calorimeter heat insulation performance factor, of real-time power to the product of temperature rate and specific heat capacity is calculated on the premise of known specific heat capacity of a sample,and heat insulation performance evaluation is realized. The evaluated heat insulation performance is a variable changing along with temperature, time and reaction process and better conforms to experiment facts relative to the traditional thermal inertia definition.

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...

AI Technical Summary

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

Images