Editor's note: The calorific value of coal refers to the energy emitted when coal burns and releases heat. The heat generation of coal used in coal transportation and marketing includes: air-dried base heat, air-dried base high heat, and base low heat. This article mainly introduces the difference between the calorific value of high-level coal and the calorific value of low-level coal.
1. The principle of high calorific value of coke and coal
The calorific value of coal is measured in an oxygen bomb calorimeter. A quantitative analysis sample is burned in an oxygen bomb calorimeter in an oxygen bomb filled with excess oxygen. The heat capacity of the oxygen bomb calorimeter is determined by burning a certain amount of reference calorific material benzoic acid under similar conditions, according The calorific value of the cartridge of the sample can be obtained after the temperature rise generated by the calorimeter system before and after the sample is burned, and the additional heat such as ignition heat is corrected. The high calorific value is obtained by subtracting the difference between the heat generated by nitric acid and the correction heat of sulfuric acid (heat formed by sulfuric acid and sulfur dioxide) from the heat of the cartridge.
2. Low calorific value
The constant calorific capacity of the coal and the low calorific capacity of the constant pressure can be calculated by analyzing the high calorific value of the sample. Calculating the constant calorific value of low-level heat requires knowing the moisture and hydrogen content in the coal sample. In principle, the calculation of constant pressure low calorific value also requires knowledge of the oxygen and nitrogen content in the coal sample.
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