Coal is a source of energy that can not be renewed. Because the coalification involves several factors, the quality of coal also varies. General Coal quality parameters is the calorie content of moisture, flight substances, ash content, carbon content, sulfur content, size and Grinding Hardgrove Index, and other parameters such as elemental analysis in the ash content (SiO2, Al2O3, P2O5, Fe2O3, etc.), analysis of the composition of sulfur (pyritic sulfur, sulfate sulfur, organic sulfur), and the melting point of ash (ash fusion temperature ). Taking the example of coal plants, the effects of the above parameters of power generation equipment are as follows:
1. Calorific value (CV)
CV has a great influence on the operation of the sprayer / grinder, charcoal tubes, and Windbox and the burner. The higher the CV of the flow of coal every hour, so the lower your rate adjusted feeder coal.
For coal with a moisture content and Grinding Hardgrove Index same level, then a high CV spray causes operate under its normal capacity (by design), or in other words, the operating ratio will be lower.
2. Coal Moisture
The results for moisture analysis is divided into free moisture (FM) daninherent moisture (IM). The number of calls for a total moisture (TM). The moisture content affects the amount of primary air intake. Coal high humidity requires more primary air for drying the coal to a specific temperature for the spray output.
3. Volatile matter
VM womb affects the perfection of the intensity of burning and fire. The evaluation is based on the ratio of carbon (fixed carbon) substances flight, called the fuel ratio (fuel ratio). The highest value of the fuel ratio, the amount of carbon in coal is not burned is also growing. If the comparison is a value greater than 1.2, then the contact will be less good, which resulted in lower recording speed.
4. Ash content
The ash content will meet with the combustion gases through the combustion chamber and the conversion in the form of fly ash (fly ash), which amounted to 80 percent and bottom ash as much as 20 percent. The higher ash content, in general, affect the level of fouling (fouling), wear and corrosion of the equipment that passed.
5. Fixed Carbon
Carbon content value obtained by reducing the number 100 with the level of water (moisture), ash content, and the number of flights. These values come up with pembatubaraan level. Carbon levels and the amount of substance used as a flight calculations to evaluate the quality of fuel, ie the fuel value ratio as described above.
6. Sulfur content
Sulfur in the coal pyritic sulfur is divided, sulfate sulfur and organic sulfur. But overall, the evaluation of the sulfur content in coal is expressed in total sulfur (TS). Sulfur content affects the level of corrosion that occurs on the cold side of air heater element, especially when the temperature is lower than the dew point of sulfur, as well as influencing the effectiveness of the precipitator ash detention peralatanelectrostatic.
7. Coal Size
Coal grain size is limited in the range of fine-grained (coal or dust pulverized coal) and coarse grains (mass of coal). The most delicate to the maximum size of 3 millimeters, while the coarse grain sizes up to 50 mm.
8. Grinding Hardgrove Index (HGI)
Devastating performance or mill is designed, in particular, the values of HGI. To download the HGI, their ability to operate lower than the default anyway to generate the level of fineness (fineness) of the same.
1. Calorific value (CV)
CV has a great influence on the operation of the sprayer / grinder, charcoal tubes, and Windbox and the burner. The higher the CV of the flow of coal every hour, so the lower your rate adjusted feeder coal.
For coal with a moisture content and Grinding Hardgrove Index same level, then a high CV spray causes operate under its normal capacity (by design), or in other words, the operating ratio will be lower.
2. Coal Moisture
The results for moisture analysis is divided into free moisture (FM) daninherent moisture (IM). The number of calls for a total moisture (TM). The moisture content affects the amount of primary air intake. Coal high humidity requires more primary air for drying the coal to a specific temperature for the spray output.
3. Volatile matter
VM womb affects the perfection of the intensity of burning and fire. The evaluation is based on the ratio of carbon (fixed carbon) substances flight, called the fuel ratio (fuel ratio). The highest value of the fuel ratio, the amount of carbon in coal is not burned is also growing. If the comparison is a value greater than 1.2, then the contact will be less good, which resulted in lower recording speed.
4. Ash content
The ash content will meet with the combustion gases through the combustion chamber and the conversion in the form of fly ash (fly ash), which amounted to 80 percent and bottom ash as much as 20 percent. The higher ash content, in general, affect the level of fouling (fouling), wear and corrosion of the equipment that passed.
5. Fixed Carbon
Carbon content value obtained by reducing the number 100 with the level of water (moisture), ash content, and the number of flights. These values come up with pembatubaraan level. Carbon levels and the amount of substance used as a flight calculations to evaluate the quality of fuel, ie the fuel value ratio as described above.
6. Sulfur content
Sulfur in the coal pyritic sulfur is divided, sulfate sulfur and organic sulfur. But overall, the evaluation of the sulfur content in coal is expressed in total sulfur (TS). Sulfur content affects the level of corrosion that occurs on the cold side of air heater element, especially when the temperature is lower than the dew point of sulfur, as well as influencing the effectiveness of the precipitator ash detention peralatanelectrostatic.
7. Coal Size
Coal grain size is limited in the range of fine-grained (coal or dust pulverized coal) and coarse grains (mass of coal). The most delicate to the maximum size of 3 millimeters, while the coarse grain sizes up to 50 mm.
8. Grinding Hardgrove Index (HGI)
Devastating performance or mill is designed, in particular, the values of HGI. To download the HGI, their ability to operate lower than the default anyway to generate the level of fineness (fineness) of the same.
