Volatile matter is one of the most common parameters measured in coal. It is part of a standard proximate analysis. Volatile matter is essentially a measure of the nonwater gases formed from a coal sample during heating.
What is the temperature for determination of volatile matter?
Volatile matter is determined as the loss in mass, less that due to moisture, when a sample is heated at 900 degrees Celsius for a period of 7 minutes. This procedure is undertaken out of contact with air under standardised conditions.
What is volatile matter in biomass?
Volatile matters are those components of fuel which are readily burnt in the presence of oxygen. … On comparing to other biomass materials (up to 87%), coal contains less volatile matter (up to 44%) . Downdraft gasifier is more suitable for fuels which contain volatile matter higher than 10%.
What is the effect of volatile matter in coal?
The volatile content has a positive effect on the volatilization rate of arsenic in the initial stage of combustion. With the same level of ash content, high-volatile coals (>30%) own a larger volatilization rate of arsenic (0.55–0.6% s–1) than the low-volatile coals (<12%) (0.25% s–1).
Which is preferred for high volatile coal and why?
Generally, the highest value bituminous coals have a specific grade of plasticity, volatility and low ash content, especially with low carbonate, phosphorus, and sulfur. … Coking coal is best if it has a very narrow range of volatility and plasticity. This is measured by the free swelling index test.
What is meant by volatile matter?
Volatile matter is one of the most common parameters measured in coal. … It is measured as the weight percent of gas (emissions) from a coal sample that is released during heating to 950 C° in an oxygen-free environment , except for moisture (which will evaporate as water vapor), at a standardized temperature.
Which coal has highest volatile matter?
What is meant by ash content?
Ash content represents the incombustible component remaining after a sample of the furnace oil is completely burned. The ash content of petroleum products is generally low. It is defined as inorganic residue that remains after combustion of the oil in air at specific high temperature. Ash ranges from 0.1–0.2%.
What is non volatile material?
In chemistry, the term nonvolatile refers to a substance that does not readily evaporate into gas under existing conditions. In other words, a nonvolatile material exerts a low vapor pressure and has a slow rate of evaporation.
What is volatile fuel?
Volatile hydrocarbons are the lighter fraction of the petroleum hydrocarbons and, together with fuel oxygenates, are most often released from crude oil and liquid petroleum products produced from crude oil. … Petroleum products are present in Earth’s subsurface as solids, liquids, or gases.
What are 4 types of coal?
Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.
Is coal a ash?
Coal ash is the waste that is left after coal is combusted (burned). It includes fly ash (fine powdery particles that are carried up the smoke stack and captured by pollution control devices) as well as coarser materials that fall to the bottom of the furnace. Most coal ash comes from coal-fired electric power plants.
Which coal has highest ash content?
Which country has the best quality coal?
Experts told Fact Check that Australia’s coal is on average high quality as a result of its low moisture and ash content, and high carbon content, compared with other countries, particularly Indonesia, the largest coal exporter in the world.
Which coal has no caking power?
Non Coking Coal does not have any caking properties and it is mainly used as thermal coal for power generation. It has a higher ash content and also used in industries like cement, fertilizer, glass, ceramic, paper, chemical and brick manufacturing.
Does coal ash contain mercury?
Coal contains trace levels of trace elements (such as arsenic, barium, beryllium, boron, cadmium, chromium, thallium, selenium, molybdenum and mercury), many of which are highly toxic to humans and other life.