Detailed Analysis: Standard Coal And Other Energy Conversion Formula

There are many kinds of energy and different calorie contents. In order to facilitate mutual comparison and Research on total quantity, our country has set the standard coal, which is 7 million calories per kilogram (29306 joules), as standard coal.

In addition, China also often converted all kinds of energy into the tonnage of standard coal, such as 1 tons of straw energy equivalent to 0.5 tons of standard coal, 1 cubic meters of biogas energy equivalent to 0.7 kilograms of standard coal.

Standard coal, also called coal equivalent, has a uniform calorific value standard.

Our country stipulates that calorific value per kilogram of standard coal is 7 million cards.

The different varieties and different contents of energy are converted into standard coal with a calorific value of 7 million calories per kilogram according to their respective calorific values.

Energy standard coal coefficient = the actual calorific value of a certain energy (1000 kcal / kg) /7000 (1000 kcal / kg)

Before converting all kinds of energy into standard coal, the actual average calorific value of all kinds of energy is calculated first and then the standard coal is converted.

The average calorific value, also known as the average calorific value, refers to the weighted average of measured calorific values of different types or varieties of energy.

The formula is:

The average calorific value (1000 kcal / kg) is equal to [sigma (certain energy measured low calorific power) * energy quantity] / total energy (ton).

Reference coefficient of all kinds of energy converted standard coal

Energy name, average low calorific value, standard coal coefficient

Raw coal 20 million 934 thousand coke / kg 0.7143 kg coal / kg

Cleaned coal 26 million 377 thousand kg / kg 0.9000 kg coal / kg

Other coal washing 8 million 374 thousand kilos / kg 0.2850 kg coal / kg

Coke 28 million 470 thousand coke / kg 0.9714 kg coal / kg

Crude oil 41 million 868 thousand kg / kg 1.4286 kg coal / kg

Fuel oil 41 million 868 thousand kg / kg 1.4286 kg coal / kg

Petrol 43 million 124 thousand kg / kg 1.4714 kg coal / kg

Kerosene 43 million 124 thousand coke / kg 1.4714 kg coal / kg

Diesel 42 million 705 thousand coke / kg 1.4571 kg coal / kg

LPG 47 million 472 thousand kg / kg 1.7143 kg coal / kg

Refinery dry gas 46 million 55 thousand kg / kg 1.5714 kg coal / kg

Natural gas 35 million 588 thousand coke / cubic meter 12.143 tons / million cubic meters

Coke oven gas 16 million 746 thousand char / cubic meter 5.714-6.143 ton / m3

Other gas 3.5701 tons / million cubic meters

Thermal 0.03412 tons / million kilocar

Electricity 1.229 tons / kilowatt hour

1, heat

The calculation method is based on the enthalpy entropy diagram (table) of the boiler outlet steam and hot water temperature and pressure, and calculates the enthalpy of each kilogram minus the heat enthalpy of feed water (or return water), and calculates the quantity of steam or hot water that is actually produced by the boiler (readout flow meter).

If some enterprises do not have a flow chart of steam or hot water, if there is no enthalpy entropy diagram (table), they can be estimated by the following methods:

(1) during the reporting period, the amount of water supplied by the boiler, such as emission reduction and pollution, will be used as the output of steam or hot water.

(2) hot water is calculated by 20 thousand cards per kilogram enthalpy under closed cycle supply. For example, when the open circuit is supplied, the enthalpy of each kilogram is calculated by 70 thousand cards (the outlet temperature is 90 C, and the return water temperature is 20 C).

(3) saturated vapor, pressure 1-2.5 kilogram / square centimeter, the heat enthalpy of 127 degrees above the temperature is 620 thousand calories, the pressure 3-7 kilogram / square centimeter, the temperature 135 degrees -165 degrees Celsius enthalpy 630 thousand card.

The pressure is 8 kg / square centimeter, the temperature is above 170 C and the steam per kilogram is calculated by 640 thousand cards.

(4) superheated steam, pressure 150 kg / square centimeter, heat enthalpy per kilogram: below 200 degrees Celsius according to 650 thousand card calculation, 220 C -260 centigrade according to 680 thousand card, 280 centigrade -320 centigrade according to 700 thousand card, 350 degrees -500 centigrade according to 700 thousand card calculation.

Joule is converted to 4.1868 joules.

2, the calculation unit of "steam" and "hot water" in the conversion energy conversion coefficient of thermal units "1000 kcal" and "standard coal" is "1000 kcal", but the "basic situation table" (energy consumption) "steam" calculation unit is "steam ton", and the "hot water" calculation unit of other energy consumption (standard coal) is "ton", so it needs further conversion to meet the requirements of the "basic situation table". According to the national standard, 7 million kilograms per ton of 1 kilograms of standard coal is calculated.

3, the calorific value of electric power usually has two kinds of calculation methods: one is calculated according to the theoretical calorific value, and the other is calculated according to the coal consumption of thermal power generation.

Each method has its own uses.

The theoretical calorific value is calculated on the basis of the equivalent of 860 kilowatt calories or 0.1229 kilograms of standard coal.

According to the calculation of coal consumption of thermal power generation, each year is different. In order to facilitate comparison, the National Bureau of statistics will fold 0.404 kilograms of standard coal per kilowatt hour as the standard of coal conversion in the future.