What is the difference between lignite and raw coal What kind of coal is lignite

1. Definitions. Coal is the most abundant and widely distributed fossil fuel on the planet. The main elements that make up the organic matter of coal are carbon, hydrogen, oxygen, nitrogen and sulfur, in addition, there are very small amounts of phosphorus, fluorine, chlorine and arsenic.

Lignite (coal); brown coal ；wood coal), which is the mineral coal with the lowest degree of coalification. A brownish-black, matte low-grade coal between peat and bituminous coal.

2. Nature. Coal: The flammable gas produced by the thermal decomposition of organic matter in coal at a certain temperature and under certain conditions is called "volatile matter", which is a mixture of various hydrocarbons, hydrogen, carbon monoxide and other compounds.

Volatile matter is also the main coal quality index, and it has an important reference role in determining the processing and utilization methods and process conditions of coal. Coal with a low degree of coalification has more volatile matter.

Lignite: Chemically reactive, easy to weather in the air, not easy to store and transport, and seriously pollute the air when burned. However, because the high-quality coal is almost hollowed out, lignite has become the main coal used in China, but because the degree of coalification of lignite is too low, there will be a large amount of black ash floating in the air when burning, if it is not washed and refined, a large number of inferior lignite will lead to the increasingly serious problem of haze in China.

3. Application. Coal has a wide range of uses, which can be summarized into three main uses according to its purpose: thermal coal, coking coal, coal for coal chemical industry, mainly including coal for gasification, coal for low-temperature dry distillation, coal for hydrogenation and liquefaction, etc.

After the pyrolysis of lignite, the resulting products are semi-coke, coal tar and coal gas. Semi-coke: Semi-coke is the main product of lignite pyrolysis and upgrading, and the calorific value of semi-coke is higher than that of original lignite (generally 50%-80% higher).

It is mainly used in: semi-coke activated carbon, semi-coke as ferroalloy reducing agent, semi-coke as blast furnace injection fuel.

Encyclopedia - Coal.

Encyclopedia - Lignite.

Lignite and raw coal are two different types of coal. Raw coal refers to the crude coal mined from the ground or underground after screening and processing to remove gangue, pyrite, etc. Lignite is the least coalified mineral coal, a brownish-black, matte lower grade coal between peat and bituminous coal.

Overall, the difference between lignite and raw coal is their appearance, composition, and use. Lignite has a brownish-black appearance that is matte, whereas raw coal is black. Lignite has a higher volatile matter, whereas raw coal has a lower volatile matter.

In addition, lignite has a lower degree of carbonization, while raw coal has a higher degree of carbonization. In terms of use, lignite is mainly used for the combustion of power plants, while raw coal is widely used in power generation, industry, and civil use.

Raw coal refers to the selection of gangue (including pyrite) with a specified particle size from the freshly mined coal.

and other sundries) after the coal. Lignite is a variety of raw coal that is classified according to its degree of charring. See the encyclopedia for details.

Lignite is the mineral coal with the lowest degree of coalification.

Since it is rich in volatiles, it is easy to burn and smoke. Traces of the original woodiness (formed by gymnosperms) can be clearly seen in the profile. Contains humic acid that is soluble in lye.

The carbon content is 60% to 77%, the density is about, and the volatile components are more than 40%. No gum layer thickness. The high calorific value of constant humidity and ash-free base is about megajoules kilograms (5500-6500 kcal kilograms).

It is mostly brown or brownish-black, with relative density.

Lignite has high moisture, high volatile content (>40%), and contains free humic acid.

It is easy to weathering and fragmentation in the air, and the ignition point is low (about 270°). If it is stored for more than two months, it is prone to fire and spontaneous combustion, and the stacking height should not exceed two meters.

Kind

There are usually two kinds:

1) Brown coal, which is loose and soft;

2) Dark lignite, dense and hard. It can be directly used as household fuel, industrial heat source fuel and power generation fuel, and can also be used as a raw material for gasification and low-temperature dry distillation.

In some parts of the world, lignite is used as a heat source fuel and as a feedstock for chemicals and gaseous and liquid fuels. In the United States, first in the northern Great Plains (North Dakota, eastern Montana, northeastern Wyoming, and northwestern South Dakota) and the Gulf Coast (Alabama, Arkansas, Kansas, Louisiana, Oklahoma, and Texas).

and the Pacific Rim States (California.

Oregon and Washington.

Lignite was discovered.

China's lignite volume is only 211.8 billion tons, compared with the world's lignite resources (2,622.9 billion tons), which accounts for about 107539 million tons of the world's total coal resources, the proportion is also very low, accounting for about 13% of the country's total coal resources, mainly distributed in eastern Inner Mongolia and eastern Yunnan, and a small amount in Northeast China and South China.

The combustion value of lignite.

Low, at 3000 kcal or less. The latest development technology at home and abroad is lignite drying, which is able to increase its combustion value to 4800 or even 6000 kcal.

There are generally four differences between raw coal and coal, which are as follows:

1. The nature is different. Raw coal: It is a product produced by coal mines that has not been washed, screened and processed, and only manually sorted gangue and sundries. Coal: is an ancient plant buried in the ground undergoing complex biochemistry.

and solid flammable minerals gradually formed by physicochemical changes;

2. The composition is different. Raw coal: includes natural coke and low-quality coal, excluding low calorific value coal (such as stone coal, peat, oil shale).

etc.); Raw coal can be divided into humus coal and saprolite according to its cause.

and humus saprolite; According to its degree of carbonization, it can be divided into peat, lignite, bituminous coal, and anthracite.

Coal: The main elements that make up coal are carbon, hydrogen, oxygen, nitrogen and sulfur, in addition, there are very small amounts of phosphorus, fluorine, chlorine and arsenic;

3. The characteristics are different. Raw coal: Coal is exposed to the atmosphere, and even at room temperature, it will slowly react with oxygen and deteriorate, resulting in deterioration of coking and calorific value.

Lower. This phenomenon is called oxidative metamorphism. Generally speaking, coal with a low degree of coalification is more susceptible to oxidation and deterioration.

Coal should be protected during storage to prevent oxidation and deterioration. Coal: Although the important position of coal has been replaced by oil, for a long period of time, due to the depletion of oil, it will inevitably decline, and coal due to huge reserves, coupled with the rapid development of science and technology, coal gasification and other new technologies are becoming more and more mature, and have been widely used;

4. Different concepts: Raw coal refers to the products produced by coal mines that have not been washed, screened and processed, but only manually sorted gangue and sundries. Including natural coke and low-quality coal, excluding low calorific value coal (such as stone coal, peat, oil shale, etc.); Raw coal can be divided into three categories: humic coal, saprolite and humic peat according to its causes. According to its degree of carbonization, it can be divided into peat, lignite, bituminous coal, and anthracite.

Coal is a solid flammable mineral that was gradually formed by ancient plants buried in the ground and undergoing complex biochemical and physicochemical changes.

Hard coal is common ordinary coal, and the degree of mineralization of lignite tung bird is lower (the proportion of carbon elements is lower, but the content of hydrogen and oxygen elements is higher), and it is still very common to use it as a raw material for power generation and chemical industry, but it is not suitable for coking.

Bituminous coal and lignite, the former is buried for a longer age than the latter, the main difference between pure bituminous coal and anthracite is the volatile branch pants spring equinox and moisture, and the combustible base.

The types of coal are bituminous coal and anthracite.

and lignite. Lignite has a lower carbon content and a higher hydrogen content than the currently widely used hard coals (i.e., bituminous and anthracite), making them easier to liquefy than other types of coal. If advanced technology is used to produce high-quality and environmentally friendly liquefied brown grade coal.

It can be used as a fuel to replace oil. The above conclusion is best supported by the fact that () is true below.

a.Lignite has a low ignition point and is low in sulphur, phosphorus and high volatility, so the smoke produced when it burns is more chaotic.

b.The ash is removed after the lignite is liquefied.

Cleaner fuels are available.

c.Lignite is sometimes enriched with some rare beneficial metal elements.

It provides the possibility of recycling coal.

d.The world's proven coal reserves are 6 3 times that of oil, of which lignite reserves account for about 24 4 of the total reserves of coal volt-to-carbon

1.Steam coal.

To put it simply, thermal coal refers to coal used as a power raw material, which mainly uses coal to burn and generate heat.

The properties are used as fuels, such as heating, power generation, building materials manufacturing, and of course can also be used as modern coal chemical industry.

The raw material type stove Wang coal.

Lignite (coal); brown coal ；wood coal), which is the mineral coal with the lowest degree of coalification. A brownish-black, matte low-grade coal between peat and bituminous coal.

Lignite, also known as firewood coal, is the mineral coal with the lowest degree of coalification.

A brownish-black, matte low-grade coal between peat and bituminous coal. It is chemically reactive, easy to weathered in the air, and not easy to store and transport.

Legend has it that a hundred years ago, a daughter-in-law came back from visiting relatives at her mother's house, and suddenly found that there were several unburned coals (tinder) in the ash heap of the stove, which were as big as a fist and as small as an apricot pit.

Shocked and happy, the daughter-in-law put a few pieces of broken charcoal on the charcoal. After a while, the charcoal was sucked. Since then, the interesting story of "living in the mother's charcoal" has been circulated among the people to this day.

The scientific name of "living in Niangjia charcoal" is lignite, also known as simmering charcoal. Lignite is brown or brownish-black in color and has a dull luster. The degree of coalification is higher than that of peat, and it belongs to young coal.

Hunger reputation brown rotten jujube coal has a unique excellent temperament, when heating, as long as a few pieces of fire are put in the furnace, and then put some pounded lignite on the fire.

Lignite is characterized by high moisture, high volatile components, easy weathering and fragmentation in the air, and low ignition point. Lignite, also known as diesel coal, is currently the lowest degree of coalification on the market, and it is also a low-grade coal due to chemical reactions.

It is strong and easy to weathering and fragmentation in the wide front of air matter, and the transportation and storage of lignite are relatively high, and there are strong market limitations.

Characteristics of lignite.

The degree of coalization of lignite is not high, resulting in a large amount of black ash floating away during combustion, and a large amount of lignite is burned without coal washing and refining, which is easy to cause serious pollution to the air.

The ignition point of lignite is not high, about 270 °, it may be stored for about two months in a relatively dry and hot place and it is easy to produce spontaneous combustion.