In the coal, chemical and other industries, calorimeters are the key equipment for detecting the calorific value of samples, and accurate calculation of moisture content is essential to ensure the accuracy of test results. Here is a detailed explanation of the calculation method of calorimeter moisture.

Clarify moisture types and basic concepts

The moisture involved in the calorimeter detection is mainly divided into total moisture and analytical water. Total moisture refers to the total moisture of the sample in the received state; analytical water refers to the moisture lost by the sample in the dry air state. Before calculation, be sure to clearly distinguish, which is the premise of accurate calculation.

Master the core calculation formula

1. Calculation of total moisture: The formula for calculating total moisture (Mt) is: Mt = (sample quality before drying - sample quality after drying)/sample quality before drying × 100%. During operation, take a certain amount of sample and dry it at a specified temperature and time. Through the poor quality before and after, the proportion of total moisture can be calculated.

2. Analytical water calculation: Analytical water (Mad) calculation is similar to total moisture, the formula is: Mad = (quality before drying of air-dried sample - quality after drying)/quality before drying of air-dried sample × 100%. Also dried, the result is obtained according to the quality change.

Standardized operation steps

1. Accurate sampling: According to the characteristics of the sample, a representative sample is selected with appropriate tools to ensure that the sample is uniform and avoid affecting the calculation results due to sampling deviations.

2. Strict drying: put the sample in the drying oven and set the temperature and time according to the standard. If the coal sample is dried, the temperature is usually controlled at 105-110 ° C and dried until the quality is constant.

3. Accurate weighing: Before and after drying, use a high-precision balance to quickly and accurately weigh the sample quality, record the data, and ensure that the data error is within the allowable range.

4. Substitute into calculation: Substitute the weighing data into the formula and calculate carefully to obtain the moisture content. After calculation, it needs to be checked multiple times to avoid calculation errors.

Precautions

During the calculation, the drying conditions of the sample should be strictly controlled, and the deviation of temperature and time will lead to inaccurate moisture calculation. At the same time, the weighing operation should be standardized to avoid human errors. In addition, different industries and samples may have slightly different calculation standards, and the operation should be carried out with reference to the corresponding standards.

Mastering the moisture calculation method of the calorimeter can provide reliable data support for sample testing. As long as the formula is kept in mind and the operation is standardized, the moisture content can be accurately calculated to ensure the efficient development of the testing work.