【Daily Question】Chemical Engineering Principles 398: Coal Powder Fineness (June 29)
Thread Content
The last edit to this post was made by Zaihui Kangqiao on 2016-7-8 at 08:40. The Chemical Engineering Theory section is now launching a \"One Question per Day\" activity aimed at helping everyone reinforce their basic knowledge in chemical engineering. Subsequent series will include those on \"Principles of Chemical Engineering\", \"Mass Transfer and Separation\", \"Thermodynamics in Chemical Engineering\", and \"Chemical Process Engineering\". We hope for your active support~~~ Answers to the questions in the \"One Question per Day\" activity can be viewed directly; the thread will be closed after 1 day! ! To encourage continued participation from everyone this year! You get 3 wealth rewards just for participating, and an additional 4 wealth points for correct answers~~~ Short answer question: What is coal powder fineness?
The fineness of coal powder generally refers to the proportion of coal powder that remains on the sieve during testing, relative to the total amount of coal powder used in the test. If the pore size of the sieve remains unchanged, the more coal powder stays on the sieve, the higher the fineness; conversely, the coarser the coal powder
An indicator that characterizes the fineness of coal powder. A certain amount of coal powder sample is placed on a sieve for screening. The percentage of the coal powder that remains on the sieve after screening, relative to the total mass of the coal powder before screening, is denoted by RX. A higher value of RX indicates that the coal powder is coarser.
The proportion of coal powder remaining on the sieve during the test, relative to the total amount of coal powder used in the test.
It generally refers to the proportion of coal powder that remains on the sieve during testing, relative to the total amount of coal powder used in the test. If the sieve pore size remains unchanged, the more coal powder stays on the sieve, the finer the particle size; conversely, the coarser the coal powder. However, the fineness of coal powder can be expressed as a percentage of the remaining coal powder on the sieve compared to the total amount of coal powder, or as a percentage of the coal powder that passes through the sieve compared to the total amount of coal powder.
The fineness of coal powder generally refers to the proportion of coal powder that remains on the sieve during testing, relative to the total amount of coal powder used in the test. If the pore size of the sieve remains unchanged, the more coal powder stays on the sieve, the higher the fineness; conversely, the coarser the coal powder
The parameter that characterizes the fineness of coal powder particles is called coal powder fineness.
The fineness of coal powder generally refers to the proportion of coal powder that remains on the sieve during testing, relative to the total amount of coal powder used in the test. If the pore size of the sieve remains unchanged, the more coal powder stays on the sieve, the higher the fineness; conversely, the coarser the coal powder
Coal powder fineness generally refers to the proportion of coal powder that remains on the sieve during testing, relative to the total amount of coal powder used in the test. If the sieve pore size remains constant, the more coal powder stays on the sieve, the higher the fineness; conversely, the coarser the coal powder. Coal powder fineness can be expressed as a percentage of the remaining coal powder on the sieve compared to the total amount of coal powder, or as a percentage of the coal powder that passes through the sieve compared to the total amount of coal powder. Generally, improving the fineness of coal powder means making it finer, which facilitates ignition, ensures more complete combustion, reduces the carbon content in fly ash, and decreases the likelihood of secondary combustion ； At the same time, the flame center in the furnace chamber drops relatively, while the furnace efficiency increases relatively. However, increasing the fineness of coal powder raises the electrical consumption of the pulverization system, accelerates the wear of the grinding components inside the coal grinder (especially steel ball mills), and increases maintenance requirements. Therefore, for power plants, the commissioning unit will provide reference values for the coal amount and current during the normal operation of the coal grinder, based on the grindability coefficient of the designed coal type.
It generally refers to the proportion of coal powder that remains on the sieve during testing, relative to the total amount of coal powder used in the test. If the pore size of the sieve remains unchanged, the more coal powder stays on the sieve, the finer the particle size; conversely, the coarser the coal powder.