Fast-heating wide-range thermogravimetric analyzer

Abstract

The invention discloses a fast-heating wide-range thermogravimetric analyzer, which comprises a weighing system, a reaction system, a heating system, and a control system, the weighing system comprises a base cabinet and an electronic scale, the reaction system comprises a sample support, a sample-loading metal mesh, a high-temperature alundum tube, and a thermocouple for measuring sample temperature, and the heating system comprises an automatic lifter, a cooling water protector, a lower heat-insulating layer, a high-temperature heating furnace, an upper heat-insulating layer, and a sealing cover; and the control system is used for controlling gas intake, water flow in the cooling water protector, the furnace temperature and temperature adjustment of the high-temperature heating furnace and recording sample quality, sample temperature, gas intake and water flow data in real time. The thermogravimetric analyzer disclosed by the invention is low in pile-up effect and close to actual working conditions, the electronic scale is stable, the fast heating of high temperature can be realized, quality and temperature data measured by a wide-range sample isothermal method are accurate and stable, and the fast-heating wide-range thermogravimetric analyzer has the advantages of small error, convenience in operation, simple structure and the like.

Description

technical field [0001] The invention relates to the field of sample analysis instruments, in particular to a rapid heating and wide-range thermogravimetric analyzer. Background technique [0002] Thermogravimetric analyzer is a thermal analysis instrument that measures the change of substance mass with temperature under programmed temperature control. Thermogravimetric analyzers use sensors to measure changes in sample quality over time. The test time interval is very short, and more data can be obtained per unit time. It is suitable for experimental research on thermal reactions of quality changes. It has been widely used in chemical industry, energy, materials, environment, engineering and other fields. Currently, the conventional methods of using thermogravimetric analyzers are isothermal thermogravimetric and temperature-programmed rate thermogravimetric experiments (non-isothermal method). The temperature-programmed thermogravimetric method uses a program to set the h...

AI Technical Summary

Problems solved by technology

The temperature-programmed thermogravimetric method uses the program to set the heating rate and initial temperature, and reacts from the initial temperature until the end of the programmed final temperature. It is only suitable for studying the intrinsic characteristics of chemical reactions, but it cannot simulate the real industrial environment to reflect the actual situation. Reaction process (such as coal pyrolysis gasification, municipal solid waste incineration, etc.); isothermal thermogravimetric method is to first raise the temperature to a predetermined temperature, and then keep the temperature at this temperature for a period of time, but it is limited by the heating rate (no more than 100 ℃ / min), the sample may have reacted during the heating process, causing errors

In addition, due to the small amount of samples (a few milligrams) used in thermogravimetric dynamics research, it is not representative for environmental samples with poor uniformity (such as raw coal, municipal solid waste)

[0003] Invention patent (ZL201310743474.0) discloses an experimental device for the research of thermogravimetry and gas production characteristics of gram-level materials. The invention uses crucibles to install gram-level materials, resulting in serious accumulation effects (uneven temperature distribution, excessive local temperature, and air diffusion) Significant limiting effect); the reaction tube and the crucible hanging on the wire hook in the tube are lowered into the heating furnace by using the lifting platinum frame to achieve instantaneous temperature rise. The vibration of the crucible will definitely affect the stable reading of the electronic balance, resulting in a large system error

[0004] Invention patent (ZL201410019356.X) discloses a thermogravimetric reactor for large sample testing. The hanging basket used in this invention is a hollow rotating body made of high temperature resistant corundum material, and the longitudinal section of the hollow rotating body is parabolic. , The side wall has evenly distributed holes, but the hardness of corundum is very high, second only to diamond, so it is difficult to manufacture the mesh basket; similarly, the lower end of the load cell installed in the sealed box passes through the stainless steel wire that penetrates the inner tube of the high temperature reactor It is connected with the boom, and the lower end of the boom is connected to the hanging basket, and the inner tube of the high-temperature reactor is lowered into the heating furnace through the movable support arm to realize the heating process, the vibration of the boom and the hanging basket will also affect the stable reading of the load cell , resulting in a systematic error

[0005] In addition, the common problem of the above-mentioned inventions is that the heating furnace first heats the reaction tube through lifting and lowering, and then heats the sample through gas heat transfer. The temperature of the sample is stable for a long time, and it is difficult to achieve the purpose of instantaneous temperature rise.

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