0
Coal is pulverized primarily to improve its combustion efficiency. Here's why:
Increased Surface Area: Pulverizing coal turns it into a fine powder, greatly increasing its surface area. This allows it to burn more quickly and completely than larger chunks.
Improved Combustion: Fine coal powder mixes better with air, making combustion more efficient. This helps generate more heat energy from the same amount of coal.
Consistent Burning: Pulverized coal provides a more uniform and controllable burn, which is essential in power plants to maintain steady steam production and electricity generation.
Better Heat Transfer: In boilers, finely ground coal allows better heat transfer to water, improving the efficiency of steam production.
Reduced Waste: Complete combustion reduces the amount of unburned carbon in ash, leading to less waste and lower emissions.
What else can I help you with?
Is there any relation between HGI and grade of coal?
Yes, there is a relation between Hardgrove Grindability Index (HGI) and the grade of coal. Essentially, the HGI is a measure of the grindability of a coal, indicating how easily it can be pulverized. Lower-grade coals typically have lower HGIs, meaning they are harder to grind compared to higher-grade coals.
Disadvantages and advantages of pulverized coal?
Advantages of Pulverized Coal Firing:The main advantage of pulverized firing system lies in the fact that by breaking a given mass of coal into smaller pieces exposes more surface area for combustion.Greater surface area of coal per unit mass of the coal allows faster combustion as more coal surface is exposed to heat and oxygen. This reduces the excess air required to ensure complete combustion and the required fan power alsoWide variety and low grade coal can be burnt more easily when the coal is pulverizedPulverized coal gives faster response to load changes as the rate of combustion can be controlled easily and immediately. Automatic control applied to pulverized coal fired boilers is effective in maintaining an almost constant steam pressure under wide load variationsThis system is free from clinker and slagging troublesThis system works successfully with or in combination with the gas and oilIt is possible to use highly pre-heated secondary air (350oC) which helps in rapid flame propagationThe pulverized system can be repaired easily without cooling the system as the pulverizing equipment is located outside the furnaceLarge amount of heat release is possible in this system compared to stoke firing systemThe banking losses are low compared to stoke firing systemThe boiler can be started from cold very rapidly and efficiently. This is highly important when grid stability is of the important concernThe external heating surface is free from corrosion and fouling as smokeless combustion is possibleThere are no moving parts in the furnace or boiler subjected to high temperature. Therefore the life of the pulverized fuel firing system is more and operation is trouble-lessPractically no ash handling problem in this type of firing systemThe furnace volume required is considerably less as the use of the burners which produce turbulence in the furnace makes it possible to complete combustion with minimum travelDisadvantages of Pulverized Coal firing:The capital cost of the pulverized coal firing system is considerably high as it requires many additional auxiliary equipment. Its operation cost is also high compared to stoke firing systemThe system produces fly ash (fine dust) which requires special and costly fly-ash removal equipments as electrostatic precipitatorsThe flame temperatures are high and the conventional types of refractory lined furnaces are not inadequate. It is always necessary to provide water cooled walls for the safety of the furnace. The maintenance cost is also high as working temperature is high which causes rapid deterioration of the refractory surface of the furnaceThe possibility of the explosion is more as coal burn like gasThe storage of powdered coal requires special attention and high protection from the fire hazards
How is coal refined?
Coal refining is nowhere near as complex as oil refining. Coal is washed with a water or chemical bath to remove some impurities. As much as 30 percent of the sulfur can be removed by washing. At the power plant, coal is pulverized to a heavy powder just before being burned. From http://www.ucsusa.org/clean_energy/coalvswind/brief_coal.html
Why is coal crushed and ground into a fine powder before it is blown into the boiler furnaces?
Coal is crushed and ground into a fine powder before being blown into boiler furnaces primarily to improve combustion efficiency. Here's why: Increased Surface Area: When coal is ground into a fine powder, its surface area increases dramatically. This allows it to burn much more quickly and completely when mixed with air. Faster Combustion: Fine coal particles ignite faster than larger chunks. This ensures that the coal burns rapidly and releases heat more efficiently, which is essential for power generation. Better Temperature Control: Pulverized coal allows for better regulation of furnace temperatures, improving the overall stability and efficiency of the boiler. Reduced Unburnt Residue: Finely ground coal ensures more complete combustion, which reduces the amount of unburnt carbon in the ash and lowers waste. Improved Heat Transfer: Complete and efficient burning of pulverized coal produces a consistent and intense flame, which enhances the heat transfer to the boiler tubes, producing steam more effectively. In short, pulverizing coal makes the combustion process more efficient, cleaner, and better suited for large-scale power generation. 4o
What is a coal holder called?
Coal Bunker, Coal scuttle, Coal hod
What type of coal can be used in pulverized combustion?
Bituminous and subbituminous coals are user to make the pulverized coal for coal burners. This is coal containing the compound bitumen. It is a soft coal. They are graded according to their carbon content. They can be processed into coke before being pulverized.
What is the unit of Hardgrove Grindability Index?
It has no units because we are determining the degree of pulverized coal.
What has the author H Heywood written?
H. Heywood has written: 'Researches on the production of pulverized coal'
What has the author K M Sprouse written?
K. M. Sprouse has written: 'Theory of pulverized coal conversion in entrained flows ..' -- subject(s): Combustion, Coal liquefaction, Coal gasification
Is there any relation between HGI and grade of coal?
Yes, there is a relation between Hardgrove Grindability Index (HGI) and the grade of coal. Essentially, the HGI is a measure of the grindability of a coal, indicating how easily it can be pulverized. Lower-grade coals typically have lower HGIs, meaning they are harder to grind compared to higher-grade coals.
What do you call a high speed rotating device that removes moisture from pulverized coal or other solids?
It is a vibratory centrifuge
What has the author Ali Mahmoud Zghoul written?
Ali Mahmoud Zghoul has written: 'Evolution of sulfur and nitrogen species during pulverized coal combustion' -- subject- s -: Coal, Combustion
Is there a sentence with the word pulverized in it?
Gravel is pulverized rock.Crushing force pulverized the granite.
What has the author D Pershing written?
D. Pershing has written: 'Bench-scale studies to identify process parameters controlling reburning with pulverized coal' -- subject(s): Combustion, Coal, Environmental aspects, Technological innovations
Disadvantages and advantages of pulverized coal?
Advantages of Pulverized Coal Firing:The main advantage of pulverized firing system lies in the fact that by breaking a given mass of coal into smaller pieces exposes more surface area for combustion.Greater surface area of coal per unit mass of the coal allows faster combustion as more coal surface is exposed to heat and oxygen. This reduces the excess air required to ensure complete combustion and the required fan power alsoWide variety and low grade coal can be burnt more easily when the coal is pulverizedPulverized coal gives faster response to load changes as the rate of combustion can be controlled easily and immediately. Automatic control applied to pulverized coal fired boilers is effective in maintaining an almost constant steam pressure under wide load variationsThis system is free from clinker and slagging troublesThis system works successfully with or in combination with the gas and oilIt is possible to use highly pre-heated secondary air (350oC) which helps in rapid flame propagationThe pulverized system can be repaired easily without cooling the system as the pulverizing equipment is located outside the furnaceLarge amount of heat release is possible in this system compared to stoke firing systemThe banking losses are low compared to stoke firing systemThe boiler can be started from cold very rapidly and efficiently. This is highly important when grid stability is of the important concernThe external heating surface is free from corrosion and fouling as smokeless combustion is possibleThere are no moving parts in the furnace or boiler subjected to high temperature. Therefore the life of the pulverized fuel firing system is more and operation is trouble-lessPractically no ash handling problem in this type of firing systemThe furnace volume required is considerably less as the use of the burners which produce turbulence in the furnace makes it possible to complete combustion with minimum travelDisadvantages of Pulverized Coal firing:The capital cost of the pulverized coal firing system is considerably high as it requires many additional auxiliary equipment. Its operation cost is also high compared to stoke firing systemThe system produces fly ash (fine dust) which requires special and costly fly-ash removal equipments as electrostatic precipitatorsThe flame temperatures are high and the conventional types of refractory lined furnaces are not inadequate. It is always necessary to provide water cooled walls for the safety of the furnace. The maintenance cost is also high as working temperature is high which causes rapid deterioration of the refractory surface of the furnaceThe possibility of the explosion is more as coal burn like gasThe storage of powdered coal requires special attention and high protection from the fire hazards
What a synonym for this word pulverized?
there are many synonyms for the word pulverized which are grind, crush, macerate, pulp, and mash.
How electricity works using coal?
When coal is used for electricity generation, it is usually pulverized and then burned in a furnace with a boiler. The furnace heat converts boiler water to steam, which is then used to spin turbines which turn generators and create electricity. Old coal power plants, especially "grandfathered" plants, are significantly less efficient and produce higher levels of waste heat. About 40% of the world's electricity comes from coal, and approximately 49% of the United States electricity comes from coal.
