Discussion on Accuracy of Coal Calorimetry Measurement with Coal Mass Heat Meter

Precision means that the parallelism is good, but it does not mean that the accuracy is good and the reproducibility is good, but the accuracy is good, then it can guarantee high precision and good reproducibility.

In terms of structure, the ambient temperature and calorimeter calorimeter are usually composed of two layers of inner and outer barrels, and the outside of the outer barrel is the environment.

When the ambient temperature is stable at a certain point, and the barrel temperature is consistent with the ambient temperature, the heat capacity of the calorimeter's thermal system is determined, and test results with good reproducibility and accuracy can be obtained.

However, in most cases, it is unrealistic to ensure the stability of the ambient temperature in the long term. The rise or fall of the ambient temperature causes the bucket to absorb or release heat. Due to the different nature of heat absorption and heat release, and each time the degree of severity is uncertain, the process is long. In this process, even if the outer barrel temperature reading is the same, the heat capacity of the instrument may vary greatly, leading to lower accuracy of the test results and reproducibility. Worse.

If the barrel temperature is affected by the number of tests, the uncertainty in the heat capacity increases compared to the instrument where the barrel temperature is not affected by the number of tests.

How to Obtain Test Results with Higher Accuracy As the market economy continues to increase, the accuracy of the heat-generating test results as the main basis for settlement has become the main focus of both supply and demand; at the same time, the use of the instrument has become increasingly Many of the password-based tests and spot checks have come under increasing pressure from various sources. An effective way to relieve this pressure is to increase the accuracy of test results.

For the existing calorimeters of various types, assuming that the instrument is qualified and the operation is correct, as long as the following items are carefully observed before the formal test, the test results with higher accuracy can be obtained.

First of all, keep the ambient temperature stable and wait for enough time so that the barrel temperature is fully consistent with the ambient temperature;

Secondly, check whether the temperature corresponding to the heat capacity of the instrument is the same as the current temperature. If the temperature does not match, recalibrate the heat capacity.

Third, the instrument that affects the external barrel temperature by the number of tests should be inserted into the standard substance test or heat capacity test when testing the heat. If the heat capacity is found to have changed, the heat capacity should be immediately recalibrated.

The ZDHW-8000 calorimeter, a precision microcomputer automatic calorimeter produced by our company, is different from other calorimeters. The calorimeter has a temperature control layer outside the tub and the temperature of the temperature control layer is stable. Set the temperature point, so as to ensure the stability of the barrel temperature, and cut off the impact of the ambient temperature on the barrel temperature. And there is a compressor refrigeration device next to the test. The test shows that when the ambient temperature does not change by more than 10°C, the heat capacity of the instrument is almost unchanged. No matter whether the ambient temperature is stable or not, it will not affect the test results. Therefore, as long as the instrument is normal and the operation is correct, accurate test results can be obtained. The parallelism and reproducibility of the results are very good. No matter whether it is a usual test, or an examination, spot check or arbitration, you can deal with it easily.