One Question per Day (December 19, 2017)

It refers to the reaction capacity of coal with various gaseous media such as CO2, O2, and H2O under certain temperature conditions. Coal with good reactivity reacts rapidly and efficiently during gasification and combustion; in fluidized bed gasification technology, it also affects the coal consumption, oxygen consumption, and the effective components in the syngas. Typically, the reaction activity is indicated by the volume fraction of CO2 reduced to CO relative to the total amount of CO2 introduced, that is, the CO2 reduction rate

Answer: The reactivity of coal refers to its ability to react with various gasification agents (such as oxygen, water vapor, carbon dioxide, and hydrogen) under certain conditions. **The CO2 reduction rate of coal coke is used as an indicator to evaluate reaction activity in the standard.

Reactivity refers to the ability of coal to react with various gaseous media, such as carbon dioxide, oxygen, water vapor, and hydrogen, under certain conditions. There are many ways to express the reaction activity of coal, and currently, the volume fraction of CO2 reduced to CO as compared to the total amount of CO2 introduced is generally used as an indicator of reaction activity, that is, the CO2 reduction rate. Furthermore, the ignition point and activation energy of coal can also roughly reflect the level of its reactive activity.

Gasification reaction activity is an important characteristic of coal; the higher this activity, the faster the reaction rate. With the same residence time, a higher carbon conversion rate is achieved, and the time required for complete gasification is reduced. It refers to the ability of coal to react with carbon dioxide, oxygen, and water vapor at a certain temperature. It is an important indicator for evaluating coal used for gasification and coal used for power generation. The degree of reactivity directly affects the coal consumption and the effective components of the gas. The activity of coal generally decreases as the degree of coalification increases. It is usually expressed by the magnitude of the CO2 reduction rate (α)

The reactivity of coal refers to its ability to react with various gasification agents (such as oxygen, water vapor, carbon dioxide, and hydrogen) under certain conditions. **The CO2 reduction rate of coal coke is used as an indicator to evaluate reaction activity in the standard.

Reactivity refers to the ability of coal to react with various gaseous media, such as carbon dioxide, oxygen, water vapor, and hydrogen, under certain conditions. There are many ways to express the reaction activity of coal, and currently, the volume fraction of CO2 reduced to CO as compared to the total amount of CO2 introduced is generally used as an indicator of reaction activity, that is, the CO2 reduction rate. Furthermore, the ignition point and activation energy of coal can also roughly reflect the level of its reactive activity. Coal with high reactivity reacts rapidly and efficiently during gasification and combustion processes. The degree of reaction activity directly affects factors such as gas production rate, oxygen consumption, composition of the gas, carbon content in ash or fly ash, and thermal efficiency. Experiments show that as the degree of metamorphism of the raw coal increases, the reactivity of its coal coke decreases sharply. Young coals (such as lignite), due to their high moisture and volatile content as well as their loose structure, have a large specific surface area for coal coking reactions. They also possess numerous transitional and macropores, which allow reactants to diffuse to these reaction surfaces; as a result, lignite exhibits high reactivity in coal coking reactions.

The reactivity of coal refers to its ability to react with various gasification agents (such as oxygen, water vapor, carbon dioxide, and hydrogen) under certain conditions. **The CO2 reduction rate of coal tar is used as an indicator to evaluate reaction activity in the standards

The reactivity of coal refers to its ability to react with various gasification agents (such as oxygen, water vapor, carbon dioxide, and hydrogen) under certain conditions. **The CO2 reduction rate of coal coke is used as an indicator to evaluate reaction activity in the standard.

The reactivity of coal, also known as its chemical activity, refers to its ability to undergo chemical reactions with various gaseous substances (such as carbon dioxide, oxygen, water vapor, etc.) under certain temperature conditions. The method commonly used in China at present is to measure the ability of the cokere slag resulting from the dry distillation of coal at high temperatures (900°C) to reduce CO2, with the reduction rate of CO2 being used to indicate the chemical reactivity of the coal toward carbon dioxide (GB220).

It refers to the ability of coal to react with various gasification agents (such as CO2, H2, and water vapor) under certain conditions. Typically, at a specific temperature, CO2 is introduced at a certain flow rate, and the reactivity of the coal is expressed by the reduction rate of CO2.