Which coals can be used as thermal coal? What is thermal coal and what are the types?!! Urgent

There is no specific standard for thermal coal, and the application range of coal for power generation is wider, and it depends on the boiler of the power plant that is determined when designing (volatile matter, ash content, moisture, calorific value, ash melting point, sulfur content), which is an important indicator of coal extraction for power plants.

There are several types of lignite, bituminous coal, anthracite, semi-anthracite, etc.

Thermal coal is coal that is used to generate electricity.

Specifically, the coal is ground into powder and burned in the boiler of the thermal power plant, and the water in the boiler absorbs heat and turns into steam with certain parameters to drive the steam turbine to rotate, and the steam turbine drives the generator to generate electricity, which is used for power generation, so it is called thermal coal. Thermal coal is pulverized coal like thermal coal.

The pulverized coal furnace of the power plant has a wide range of applications for coal types, and it can be designed to burn lignite with high volatile content or anthracite with low volatile. However, it is not possible to burn all kinds of volatile coal in an installed boiler because it is limited by the type of injector and the structure of the furnace. The quality of coal used in power plants and boiler equipment should be adapted to each other, and for coal that does not meet the requirements of the standard, with the consent of the power plant, the coal department shall provide a suitable coal power plant selection.

For coal that does not meet the requirements of a certain index, and it is really necessary to use, it should be resolved through negotiation between the supply and demand sides.

Coal power: refers to: the use of coal to generate electricity. Provide electrical energy.

Generally, it refers to the generation of electricity powered by coal**. It is coal-fired power generation, which belongs to the main body of thermal power generation (thermal power).

Coal power accounts for a considerable proportion of China's energy structure, accounting for about 70% of the country's electricity.

Thermal coal, as the name suggests, is coal used to generate electricity! Mountains of thermal coal.

Metrics explained. Volatile matter.

Volatile matter is the primary indicator to determine the ignition characteristics of coal. The higher the volatile content, the easier it is to catch fire. According to the boiler design requirements, the value of volatile matter for coal supply should not change too much, otherwise it will affect the normal operation of the boiler.

For example, after the original design is burned with low volatile coal and high volatile coal, the furnace may be shut down due to the burning of the injector due to the flame center approaching the outlet of the injector; If the original design uses high volatile coal and changes to low volatile coal, the combustion will be incomplete due to too late ignition, and even cause a flameout accident. Therefore, when supplying coal, it is necessary to try to design the volatile coal type or similar coal type according to the original talk.

Ash content. The ash content will reduce the flame propagation speed, delay the ignition time, unstable combustion, and reduce the furnace temperature.

Moisture content. Water is one of the harmful substances in the combustion process, it absorbs a lot of heat during the evaporation process, and the impact on combustion is much greater than ash.

Heat in the hand cavity.

The calorific value of coal is an important basis for boiler design. Because the pulverized coal in the power plant has strong adaptability to the type of coal, as long as the calorific value of the coal is roughly consistent with the design requirements of the boiler.

Ash melting point. Because the core temperature of the furnace flame of the pulverized coal furnace is more than 1500, at such a high temperature, the coal ash is mostly in a soft or fluid state.

Sulfur content of coal. Sulfur is a harmful impurity in coal, although it has no effect on the combustion itself, but its content is too high, and the corrosion of equipment and environmental pollution are quite serious. Therefore, the sulfur content of coal used in power plants should not be too high, and the general requirement should not be exceeded.