Single-mold-cavity microwave thermogravimetric analysis system

Abstract

The invention relates to a single-mold-cavity microwave thermogravimetric analysis system, belonging to the technical field of an analytical test device. The single-mold-cavity microwave thermogravimetric analysis system comprises an electric cabinet, a microwave source, a microwave reactor, a microwave transmission system, a PLC control system, a mass measurement system, a temperature measurement system and an atmosphere regulating system; the electric cabinet comprises a cabinet body standing on the ground, and a cabinet head arranged at the upper surface of one end of the cabinet body; the electric cabinet is used for supplying electric energy for a thermogravimetric analysis system body; the microwave source comprises a magnetron; the magnetron is arranged in the cabinet head; the microwave transmission system is used for transmitting microwaves generated by the magnetron into the microwave reactor; the upper end of the microwave reactor is provided with the temperature measurement system, and the lower end of the microwave reactor is provided with the mass measurement system; the microwave reactor is connected with the atmosphere regulating system. The microwave thermogravimetric analysis system is relatively reasonable in structure, relatively accurate in measurement and relatively convenient to operate and maintain, and is used for measuring the mass change of a big sample at high temperature and different atmospheres in a microwave heating way.

Description

technical field [0001] The invention relates to a single-mode cavity microwave thermogravimetric analysis system, which belongs to the technical field of analysis and testing devices. Background technique [0002] Thermogravimetry is a technique to obtain the relationship between the mass and temperature of a substance with the help of a thermobalance under program-controlled temperature. At present, in conventional thermogravimetric analysis, a very small amount of sample is usually heated by electric heating, which belongs to the external heating method; the temperature of the atmosphere around the sample is measured by a thermocouple to represent the temperature of the sample, and the quality of the sample under program control temperature is studied. vs. temperature or mass vs. time. Since the samples used in the experiment are generally bulky bulk materials or heavy granular materials, the mass of the samples is too small to truly reflect the properties of the large sa...

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Problems solved by technology

[0005] The structure of the above-mentioned patents has disadvantages: ①The vacuum atmosphere furnace is located below the mass sensor, and its high-temperature flame directly hits the mass sensor above, which is easy to change the ambient temperature of the mass sensor, causing the zero point drift of the mass sensor, which will affect the performance of the instrument. Measurement accuracy; ②The high temperature-resistant hanging basket is connected to the quality sensor through the heat-resistant wire, the heat-resistant wire connecting ring and the high-temperature-resistant connecting rod, and the heat-resistant wire and the heat-resistant wire connecting rod are made of heat-resistant metal, which will be oxidized , corrosion, not very durable, and the cost is higher

[0007] The structure of the above-mentioned patent has disadvantages: ① The infrared thermometer is located outside the furnace, and the probe of the infrared thermometer is facing the position where the sample is suspended in the furnace. The temperature measured by the infrared thermometer is actually the temperature of the hanging basket wall, and the thermocouple is installed Located at the lower part of the furnace, the thermocouple is not in contact with the material, and the temperature measured by the thermocouple is actually the temperature of the atmosphere in the furnace. In this structure, the temperature measured by the infrared thermometer and the thermocouple is not the temperature of the material, and the measured temperature cannot represent The actual temperature of the material, the measurement accuracy is not high; ②The reaction chamber adopts a box-type, multi-mode cavity, which cannot obtain uniform distribution of microwaves in the cavity, and different positions of the sample in the cavity will affect the test results, the microwave utilization rate is low, and Unable to provide basis and guidance for the development of microwave equipment; ③ inconvenient operation and maintenance

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