First, the core preparation before adding water

Before adding water to the coal calorimeter, two key preparations need to be made. First, confirm the status of the outer and inner cylinders of the calorimeter, check whether there is any leakage or damage, and avoid leakage affecting the operation of the equipment after adding water. Second, prepare pure water or distilled water that meets the requirements. It is strictly forbidden to use tap water to prevent impurities in the water from adhering to the instrument components and interfering with the accuracy of heat detection. At the same time, prepare an accurate measuring cup to lay the foundation for subsequent quantitative water addition.

Second, clarify the precise standard for adding water

The standard for adding water to a coal calorimeter is strictly defined, which is the key to ensuring the accuracy of the test results. When adding water to the inner cylinder, the water level needs to be controlled in the range of 2/3 to 3/4 of the volume of the inner cylinder. If the water level is too low, it will lead to insufficient heat transfer. If it is too high, it may overflow after ignition and pollute the instrument. When adding water to the outer cylinder, it is necessary to ensure that the water level is within the scale line marked by the outer cylinder. Some models of instruments have the highest and lowest water levels. When adding water, it must be strictly followed to maintain the stability of the water level of the outer cylinder and provide a stable external environment for the reaction of the inner cylinder.

III. Standardized water addition operation steps

1. Steps to add water to the inner cylinder: first wash the measuring cup, pour in a sufficient amount of purified water, and slowly inject it along the inner wall of the inner cylinder. During the process, pay close attention to the water level changes. When the water level approaches the standard range, slow down the flow rate and use a dropper to fine-tune to the precise water level to avoid the generation of bubbles. Bubbles will affect the heat transfer efficiency and lead to deviations in the detection results.

2. Steps to add water to the outer cylinder: Open the water inlet of the outer cylinder, add water with the help of a funnel, slowly inject purified water, and observe the scale line on the side of the outer cylinder. Stop adding water immediately when the water level reaches the specified scale. After the water addition is completed, cover the water inlet tightly to prevent water leakage during subsequent use.

IV. Inspection and adjustment after adding water

After the water addition is completed, two inspections need to be carried out. First, check whether the water level is stable. After standing for a few minutes, observe whether the water level has dropped. If there is a drop, it needs to be replenished to the standard water level in time. Second, check the tightness of the instrument, close all water outlets and sealing parts, and start the instrument for no-load test. If there is no water leakage alarm, it will explain the water addition operation specifications. If the water level deviation or water leakage problem is found, it needs to be adjusted in time and re-added to the standard state to ensure that the instrument is in the best operating condition.

Key considerations for adding water

1. When adding water, be sure to avoid water splashing on the electrical components of the instrument to prevent short circuit damage to the instrument;

2. Check the water level before each test. If the water level decreases due to evaporation, it needs to be replenished in time to ensure that the water level of each test is consistent;

3. Regularly clean the measuring cup and water pipe to prevent scale accumulation and affect the accuracy of water addition.

4. Operate in strict accordance with the water addition standard in the instrument manual. The water addition requirements of different models of calorimeters may vary, and general standards cannot be blindly applied.

Mastering the water addition method of the coal calorimeter can not only ensure the normal operation of the instrument, but also ensure the accuracy of the coal heat detection results. Follow the above steps to standardize the operation, and the water addition work can be easily completed, laying a solid foundation for coal quality inspection.