The calorific value of coal refers to the energy released when coal burns to release heat, also known as the heat of coal.
The calorific value is higher, that is, the heat generated by coal burning in air at normal pressure. In fact, it is the heat obtained by subtracting the heat of formation of sulfuric acid and nitric acid from the calorific value of coal barrel measured in the laboratory.
net calorific power
The low calorific value of coal refers to the heat generated by the combustion of coal in the air at normal pressure. After deducting the heat of vaporization of water in coal (oxidation water generated by the combustion of hydrogen in organic matter in coal, free water and bound water in coal), the remaining heat can actually be utilized.
Distinguish differences
The difference between high calorific value and low calorific value lies in whether water in fuel combustion products is liquid or gaseous, which means high calorific value for liquid water and low calorific value for gaseous water. The low calorific value is equal to the high calorific value minus the condensation heat of water vapor.
Fuel is mostly used for combustion, and the exhaust temperature of various furnaces exceeds the condensation temperature of water vapor, so the condensation heat of water vapor cannot be released, so the low calorific value of fuel application is generally used as the calculation basis in energy utilization.
Supplementary information:
Coal stock
1. yongtai energy
The company is a company mainly engaged in coal mining. At present, all coal products are coking coal and its blending coal. In 20 12, the company successfully acquired Yuan Yin Coal Coking Company and Conway Group, which further strengthened the company's coking coal resources reserve and consolidated its market position. At present, the company's total coking coal and coal blending capacity is 6.5438+0.08 million tons/year, and its resource reserves are 724 million tons. The production capacity of high-quality thermal coal is 6 million tons/year, and its resource reserves are 65.438+0.65438+0.44 million tons, which has strong resource advantages.
2. China Shenhua
The company is the world's leading comprehensive energy company based on coal, the largest coal producer and seller in China, the second largest listed coal company in the world, and has the largest high-quality coal reserves in China. Its main business includes coal production, sales, power production, thermal production and supply, as well as railway, port and other related transportation services. The company has a comprehensive transportation network consisting of railways and ports, and the second largest coal shipment port in China.
3. Thaddaeus
The company is mainly engaged in coal production and management. The company's mining area is rich in reserves and complete in coal types. It spans Yima, Mianchi and Shaanxi counties under Sanmenxia City and Yiyang, Xin 'an and Jin Meng counties (cities) under Luoyang City. At present, there are 1 1 production mines and 7 auxiliary production units, with more than 65438+ million employees and their families, producing high-quality long-flame coal and coking coal.
4. Shanghai Energy
The company takes coal, electricity and aluminum transportation as the leading industry, and its main products are coal, aluminum ingots and electricity. It has four pairs of coal production mines, four coal preparation plants, a power plant, an electrolytic aluminum plant, an aluminum processing plant and a 179.3 km self-operated railway special line, as well as mechanical repair, construction and installation, automobile transportation and logistics services. The company has successively won the National May 1st Labor Award and the National Contract-abiding and Credit-abiding.