Standard coal, also known as coal equivalent, is the energy that converts different kinds of energy with different heat contents into a unified standard content calculation unit according to their different heat contents. Different types of energy have different units of measurement, such as coal and oil, which are calculated in tons; Gas energy such as natural gas and coal gas is calculated in cubic meters; Electricity is calculated in kWh; Heat is calculated in kilocalories. In order to find out the total amount of energy with different calorific values and different units of measurement, comprehensive calculation must be carried out. Because all kinds of energy have energy properties and can be converted into heat under certain conditions, the heat contained in all kinds of energy sources is selected as a unified accounting unit. The commonly used unified units are kilocalories and tons of standard coal (or standard oil). At present, China adopts standard coal as the measurement unit of energy. The international system of units is joule. The conversion method is: measure various fuels and power energy with 7000 kcal.
Conversion coefficient of energy converted into standard coal = actual calorific value per kilogram of an energy source/calorific value per kilogram of standard coal (7000 kcal).
Before converting all kinds of energy into standard coal, the actual average calorific value of all kinds of energy should be calculated first, and then converted into standard coal. The average calorific value, also known as the average calorific value, refers to the weighted average of the measured calorific value of different kinds or varieties of energy. The calculation formula is:
Average calorific value (kcal/kg) = ∑ (measured low calorific value of an energy source) (kcal/kg) × energy quantity (ton)/total energy (ton)
At present, there is no internationally recognized unified standard for calculating standard coal. The calorific value of 1kg standard coal is calculated by 7,000 kcal in China, the former Soviet Union and Japan and 6,880 kcal in the United Nations.
The calorific value of coal is calculated by detecting moisture, volatile matter and ash, and then the starting heat is calculated by a formula.
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